diff options
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 6004 |
1 files changed, 6004 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c new file mode 100644 index 000000000..4d73a7f67 --- /dev/null +++ b/drivers/scsi/scsi_debug.c @@ -0,0 +1,6004 @@ +/* + * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv + * Copyright (C) 1992 Eric Youngdale + * Simulate a host adapter with 2 disks attached. Do a lot of checking + * to make sure that we are not getting blocks mixed up, and PANIC if + * anything out of the ordinary is seen. + * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + * + * Copyright (C) 2001 - 2018 Douglas Gilbert + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * For documentation see http://sg.danny.cz/sg/sdebug26.html + * + */ + + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ + +#include <linux/module.h> + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/jiffies.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/genhd.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/vmalloc.h> +#include <linux/moduleparam.h> +#include <linux/scatterlist.h> +#include <linux/blkdev.h> +#include <linux/crc-t10dif.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/atomic.h> +#include <linux/hrtimer.h> +#include <linux/uuid.h> +#include <linux/t10-pi.h> + +#include <net/checksum.h> + +#include <asm/unaligned.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> +#include <scsi/scsicam.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_dbg.h> + +#include "sd.h" +#include "scsi_logging.h" + +/* make sure inq_product_rev string corresponds to this version */ +#define SDEBUG_VERSION "0188" /* format to fit INQUIRY revision field */ +static const char *sdebug_version_date = "20190125"; + +#define MY_NAME "scsi_debug" + +/* Additional Sense Code (ASC) */ +#define NO_ADDITIONAL_SENSE 0x0 +#define LOGICAL_UNIT_NOT_READY 0x4 +#define LOGICAL_UNIT_COMMUNICATION_FAILURE 0x8 +#define UNRECOVERED_READ_ERR 0x11 +#define PARAMETER_LIST_LENGTH_ERR 0x1a +#define INVALID_OPCODE 0x20 +#define LBA_OUT_OF_RANGE 0x21 +#define INVALID_FIELD_IN_CDB 0x24 +#define INVALID_FIELD_IN_PARAM_LIST 0x26 +#define UA_RESET_ASC 0x29 +#define UA_CHANGED_ASC 0x2a +#define TARGET_CHANGED_ASC 0x3f +#define LUNS_CHANGED_ASCQ 0x0e +#define INSUFF_RES_ASC 0x55 +#define INSUFF_RES_ASCQ 0x3 +#define POWER_ON_RESET_ASCQ 0x0 +#define BUS_RESET_ASCQ 0x2 /* scsi bus reset occurred */ +#define MODE_CHANGED_ASCQ 0x1 /* mode parameters changed */ +#define CAPACITY_CHANGED_ASCQ 0x9 +#define SAVING_PARAMS_UNSUP 0x39 +#define TRANSPORT_PROBLEM 0x4b +#define THRESHOLD_EXCEEDED 0x5d +#define LOW_POWER_COND_ON 0x5e +#define MISCOMPARE_VERIFY_ASC 0x1d +#define MICROCODE_CHANGED_ASCQ 0x1 /* with TARGET_CHANGED_ASC */ +#define MICROCODE_CHANGED_WO_RESET_ASCQ 0x16 +#define WRITE_ERROR_ASC 0xc + +/* Additional Sense Code Qualifier (ASCQ) */ +#define ACK_NAK_TO 0x3 + +/* Default values for driver parameters */ +#define DEF_NUM_HOST 1 +#define DEF_NUM_TGTS 1 +#define DEF_MAX_LUNS 1 +/* With these defaults, this driver will make 1 host with 1 target + * (id 0) containing 1 logical unit (lun 0). That is 1 device. + */ +#define DEF_ATO 1 +#define DEF_CDB_LEN 10 +#define DEF_JDELAY 1 /* if > 0 unit is a jiffy */ +#define DEF_DEV_SIZE_MB 8 +#define DEF_DIF 0 +#define DEF_DIX 0 +#define DEF_D_SENSE 0 +#define DEF_EVERY_NTH 0 +#define DEF_FAKE_RW 0 +#define DEF_GUARD 0 +#define DEF_HOST_LOCK 0 +#define DEF_LBPU 0 +#define DEF_LBPWS 0 +#define DEF_LBPWS10 0 +#define DEF_LBPRZ 1 +#define DEF_LOWEST_ALIGNED 0 +#define DEF_NDELAY 0 /* if > 0 unit is a nanosecond */ +#define DEF_NO_LUN_0 0 +#define DEF_NUM_PARTS 0 +#define DEF_OPTS 0 +#define DEF_OPT_BLKS 1024 +#define DEF_PHYSBLK_EXP 0 +#define DEF_OPT_XFERLEN_EXP 0 +#define DEF_PTYPE TYPE_DISK +#define DEF_REMOVABLE false +#define DEF_SCSI_LEVEL 7 /* INQUIRY, byte2 [6->SPC-4; 7->SPC-5] */ +#define DEF_SECTOR_SIZE 512 +#define DEF_UNMAP_ALIGNMENT 0 +#define DEF_UNMAP_GRANULARITY 1 +#define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF +#define DEF_UNMAP_MAX_DESC 256 +#define DEF_VIRTUAL_GB 0 +#define DEF_VPD_USE_HOSTNO 1 +#define DEF_WRITESAME_LENGTH 0xFFFF +#define DEF_STRICT 0 +#define DEF_STATISTICS false +#define DEF_SUBMIT_QUEUES 1 +#define DEF_UUID_CTL 0 +#define JDELAY_OVERRIDDEN -9999 + +#define SDEBUG_LUN_0_VAL 0 + +/* bit mask values for sdebug_opts */ +#define SDEBUG_OPT_NOISE 1 +#define SDEBUG_OPT_MEDIUM_ERR 2 +#define SDEBUG_OPT_TIMEOUT 4 +#define SDEBUG_OPT_RECOVERED_ERR 8 +#define SDEBUG_OPT_TRANSPORT_ERR 16 +#define SDEBUG_OPT_DIF_ERR 32 +#define SDEBUG_OPT_DIX_ERR 64 +#define SDEBUG_OPT_MAC_TIMEOUT 128 +#define SDEBUG_OPT_SHORT_TRANSFER 0x100 +#define SDEBUG_OPT_Q_NOISE 0x200 +#define SDEBUG_OPT_ALL_TSF 0x400 +#define SDEBUG_OPT_RARE_TSF 0x800 +#define SDEBUG_OPT_N_WCE 0x1000 +#define SDEBUG_OPT_RESET_NOISE 0x2000 +#define SDEBUG_OPT_NO_CDB_NOISE 0x4000 +#define SDEBUG_OPT_HOST_BUSY 0x8000 +#define SDEBUG_OPT_CMD_ABORT 0x10000 +#define SDEBUG_OPT_ALL_NOISE (SDEBUG_OPT_NOISE | SDEBUG_OPT_Q_NOISE | \ + SDEBUG_OPT_RESET_NOISE) +#define SDEBUG_OPT_ALL_INJECTING (SDEBUG_OPT_RECOVERED_ERR | \ + SDEBUG_OPT_TRANSPORT_ERR | \ + SDEBUG_OPT_DIF_ERR | SDEBUG_OPT_DIX_ERR | \ + SDEBUG_OPT_SHORT_TRANSFER | \ + SDEBUG_OPT_HOST_BUSY | \ + SDEBUG_OPT_CMD_ABORT) +/* When "every_nth" > 0 then modulo "every_nth" commands: + * - a missing response is simulated if SDEBUG_OPT_TIMEOUT is set + * - a RECOVERED_ERROR is simulated on successful read and write + * commands if SDEBUG_OPT_RECOVERED_ERR is set. + * - a TRANSPORT_ERROR is simulated on successful read and write + * commands if SDEBUG_OPT_TRANSPORT_ERR is set. + * - similarly for DIF_ERR, DIX_ERR, SHORT_TRANSFER, HOST_BUSY and + * CMD_ABORT + * + * When "every_nth" < 0 then after "- every_nth" commands the selected + * error will be injected. The error will be injected on every subsequent + * command until some other action occurs; for example, the user writing + * a new value (other than -1 or 1) to every_nth: + * echo 0 > /sys/bus/pseudo/drivers/scsi_debug/every_nth + */ + +/* As indicated in SAM-5 and SPC-4 Unit Attentions (UAs) are returned in + * priority order. In the subset implemented here lower numbers have higher + * priority. The UA numbers should be a sequence starting from 0 with + * SDEBUG_NUM_UAS being 1 higher than the highest numbered UA. */ +#define SDEBUG_UA_POR 0 /* Power on, reset, or bus device reset */ +#define SDEBUG_UA_BUS_RESET 1 +#define SDEBUG_UA_MODE_CHANGED 2 +#define SDEBUG_UA_CAPACITY_CHANGED 3 +#define SDEBUG_UA_LUNS_CHANGED 4 +#define SDEBUG_UA_MICROCODE_CHANGED 5 /* simulate firmware change */ +#define SDEBUG_UA_MICROCODE_CHANGED_WO_RESET 6 +#define SDEBUG_NUM_UAS 7 + +/* when 1==SDEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this + * sector on read commands: */ +#define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */ +#define OPT_MEDIUM_ERR_NUM 10 /* number of consecutive medium errs */ + +/* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1) + * or "peripheral device" addressing (value 0) */ +#define SAM2_LUN_ADDRESS_METHOD 0 + +/* SDEBUG_CANQUEUE is the maximum number of commands that can be queued + * (for response) per submit queue at one time. Can be reduced by max_queue + * option. Command responses are not queued when jdelay=0 and ndelay=0. The + * per-device DEF_CMD_PER_LUN can be changed via sysfs: + * /sys/class/scsi_device/<h:c:t:l>/device/queue_depth + * but cannot exceed SDEBUG_CANQUEUE . + */ +#define SDEBUG_CANQUEUE_WORDS 3 /* a WORD is bits in a long */ +#define SDEBUG_CANQUEUE (SDEBUG_CANQUEUE_WORDS * BITS_PER_LONG) +#define DEF_CMD_PER_LUN 255 + +#define F_D_IN 1 +#define F_D_OUT 2 +#define F_D_OUT_MAYBE 4 /* WRITE SAME, NDOB bit */ +#define F_D_UNKN 8 +#define F_RL_WLUN_OK 0x10 +#define F_SKIP_UA 0x20 +#define F_DELAY_OVERR 0x40 +#define F_SA_LOW 0x80 /* cdb byte 1, bits 4 to 0 */ +#define F_SA_HIGH 0x100 /* as used by variable length cdbs */ +#define F_INV_OP 0x200 +#define F_FAKE_RW 0x400 +#define F_M_ACCESS 0x800 /* media access */ +#define F_SSU_DELAY 0x1000 +#define F_SYNC_DELAY 0x2000 + +#define FF_RESPOND (F_RL_WLUN_OK | F_SKIP_UA | F_DELAY_OVERR) +#define FF_MEDIA_IO (F_M_ACCESS | F_FAKE_RW) +#define FF_SA (F_SA_HIGH | F_SA_LOW) +#define F_LONG_DELAY (F_SSU_DELAY | F_SYNC_DELAY) + +#define SDEBUG_MAX_PARTS 4 + +#define SDEBUG_MAX_CMD_LEN 32 + + +struct sdebug_dev_info { + struct list_head dev_list; + unsigned int channel; + unsigned int target; + u64 lun; + uuid_t lu_name; + struct sdebug_host_info *sdbg_host; + unsigned long uas_bm[1]; + atomic_t num_in_q; + atomic_t stopped; + bool used; +}; + +struct sdebug_host_info { + struct list_head host_list; + struct Scsi_Host *shost; + struct device dev; + struct list_head dev_info_list; +}; + +#define to_sdebug_host(d) \ + container_of(d, struct sdebug_host_info, dev) + +enum sdeb_defer_type {SDEB_DEFER_NONE = 0, SDEB_DEFER_HRT = 1, + SDEB_DEFER_WQ = 2}; + +struct sdebug_defer { + struct hrtimer hrt; + struct execute_work ew; + int sqa_idx; /* index of sdebug_queue array */ + int qc_idx; /* index of sdebug_queued_cmd array within sqa_idx */ + int issuing_cpu; + bool init_hrt; + bool init_wq; + bool aborted; /* true when blk_abort_request() already called */ + enum sdeb_defer_type defer_t; +}; + +struct sdebug_queued_cmd { + /* corresponding bit set in in_use_bm[] in owning struct sdebug_queue + * instance indicates this slot is in use. + */ + struct sdebug_defer *sd_dp; + struct scsi_cmnd *a_cmnd; + unsigned int inj_recovered:1; + unsigned int inj_transport:1; + unsigned int inj_dif:1; + unsigned int inj_dix:1; + unsigned int inj_short:1; + unsigned int inj_host_busy:1; + unsigned int inj_cmd_abort:1; +}; + +struct sdebug_queue { + struct sdebug_queued_cmd qc_arr[SDEBUG_CANQUEUE]; + unsigned long in_use_bm[SDEBUG_CANQUEUE_WORDS]; + spinlock_t qc_lock; + atomic_t blocked; /* to temporarily stop more being queued */ +}; + +static atomic_t sdebug_cmnd_count; /* number of incoming commands */ +static atomic_t sdebug_completions; /* count of deferred completions */ +static atomic_t sdebug_miss_cpus; /* submission + completion cpus differ */ +static atomic_t sdebug_a_tsf; /* 'almost task set full' counter */ + +struct opcode_info_t { + u8 num_attached; /* 0 if this is it (i.e. a leaf); use 0xff */ + /* for terminating element */ + u8 opcode; /* if num_attached > 0, preferred */ + u16 sa; /* service action */ + u32 flags; /* OR-ed set of SDEB_F_* */ + int (*pfp)(struct scsi_cmnd *, struct sdebug_dev_info *); + const struct opcode_info_t *arrp; /* num_attached elements or NULL */ + u8 len_mask[16]; /* len_mask[0]-->cdb_len, then mask for cdb */ + /* 1 to min(cdb_len, 15); ignore cdb[15...] */ +}; + +/* SCSI opcodes (first byte of cdb) of interest mapped onto these indexes */ +enum sdeb_opcode_index { + SDEB_I_INVALID_OPCODE = 0, + SDEB_I_INQUIRY = 1, + SDEB_I_REPORT_LUNS = 2, + SDEB_I_REQUEST_SENSE = 3, + SDEB_I_TEST_UNIT_READY = 4, + SDEB_I_MODE_SENSE = 5, /* 6, 10 */ + SDEB_I_MODE_SELECT = 6, /* 6, 10 */ + SDEB_I_LOG_SENSE = 7, + SDEB_I_READ_CAPACITY = 8, /* 10; 16 is in SA_IN(16) */ + SDEB_I_READ = 9, /* 6, 10, 12, 16 */ + SDEB_I_WRITE = 10, /* 6, 10, 12, 16 */ + SDEB_I_START_STOP = 11, + SDEB_I_SERV_ACT_IN_16 = 12, /* add ...SERV_ACT_IN_12 if needed */ + SDEB_I_SERV_ACT_OUT_16 = 13, /* add ...SERV_ACT_OUT_12 if needed */ + SDEB_I_MAINT_IN = 14, + SDEB_I_MAINT_OUT = 15, + SDEB_I_VERIFY = 16, /* 10 only */ + SDEB_I_VARIABLE_LEN = 17, /* READ(32), WRITE(32), WR_SCAT(32) */ + SDEB_I_RESERVE = 18, /* 6, 10 */ + SDEB_I_RELEASE = 19, /* 6, 10 */ + SDEB_I_ALLOW_REMOVAL = 20, /* PREVENT ALLOW MEDIUM REMOVAL */ + SDEB_I_REZERO_UNIT = 21, /* REWIND in SSC */ + SDEB_I_ATA_PT = 22, /* 12, 16 */ + SDEB_I_SEND_DIAG = 23, + SDEB_I_UNMAP = 24, + SDEB_I_XDWRITEREAD = 25, /* 10 only */ + SDEB_I_WRITE_BUFFER = 26, + SDEB_I_WRITE_SAME = 27, /* 10, 16 */ + SDEB_I_SYNC_CACHE = 28, /* 10, 16 */ + SDEB_I_COMP_WRITE = 29, + SDEB_I_LAST_ELEMENT = 30, /* keep this last (previous + 1) */ +}; + + +static const unsigned char opcode_ind_arr[256] = { +/* 0x0; 0x0->0x1f: 6 byte cdbs */ + SDEB_I_TEST_UNIT_READY, SDEB_I_REZERO_UNIT, 0, SDEB_I_REQUEST_SENSE, + 0, 0, 0, 0, + SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, 0, + 0, 0, SDEB_I_INQUIRY, 0, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE, + SDEB_I_RELEASE, + 0, 0, SDEB_I_MODE_SENSE, SDEB_I_START_STOP, 0, SDEB_I_SEND_DIAG, + SDEB_I_ALLOW_REMOVAL, 0, +/* 0x20; 0x20->0x3f: 10 byte cdbs */ + 0, 0, 0, 0, 0, SDEB_I_READ_CAPACITY, 0, 0, + SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, SDEB_I_VERIFY, + 0, 0, 0, 0, 0, SDEB_I_SYNC_CACHE, 0, 0, + 0, 0, 0, SDEB_I_WRITE_BUFFER, 0, 0, 0, 0, +/* 0x40; 0x40->0x5f: 10 byte cdbs */ + 0, SDEB_I_WRITE_SAME, SDEB_I_UNMAP, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, SDEB_I_LOG_SENSE, 0, 0, + 0, 0, 0, SDEB_I_XDWRITEREAD, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE, + SDEB_I_RELEASE, + 0, 0, SDEB_I_MODE_SENSE, 0, 0, 0, 0, 0, +/* 0x60; 0x60->0x7d are reserved, 0x7e is "extended cdb" */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, SDEB_I_VARIABLE_LEN, +/* 0x80; 0x80->0x9f: 16 byte cdbs */ + 0, 0, 0, 0, 0, SDEB_I_ATA_PT, 0, 0, + SDEB_I_READ, SDEB_I_COMP_WRITE, SDEB_I_WRITE, 0, 0, 0, 0, 0, + 0, SDEB_I_SYNC_CACHE, 0, SDEB_I_WRITE_SAME, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, SDEB_I_SERV_ACT_IN_16, SDEB_I_SERV_ACT_OUT_16, +/* 0xa0; 0xa0->0xbf: 12 byte cdbs */ + SDEB_I_REPORT_LUNS, SDEB_I_ATA_PT, 0, SDEB_I_MAINT_IN, + SDEB_I_MAINT_OUT, 0, 0, 0, + SDEB_I_READ, 0 /* SDEB_I_SERV_ACT_OUT_12 */, SDEB_I_WRITE, + 0 /* SDEB_I_SERV_ACT_IN_12 */, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, +/* 0xc0; 0xc0->0xff: vendor specific */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, +}; + +/* + * The following "response" functions return the SCSI mid-level's 4 byte + * tuple-in-an-int. To handle commands with an IMMED bit, for a faster + * command completion, they can mask their return value with + * SDEG_RES_IMMED_MASK . + */ +#define SDEG_RES_IMMED_MASK 0x40000000 + +static int resp_inquiry(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_report_luns(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_requests(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_mode_sense(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_mode_select(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_log_sense(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_readcap(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_read_dt0(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_dt0(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_scat(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_start_stop(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_readcap16(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_get_lba_status(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_report_tgtpgs(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_unmap(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_rsup_opcodes(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_rsup_tmfs(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_same_10(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_same_16(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_xdwriteread_10(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_comp_write(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_write_buffer(struct scsi_cmnd *, struct sdebug_dev_info *); +static int resp_sync_cache(struct scsi_cmnd *, struct sdebug_dev_info *); + +/* + * The following are overflow arrays for cdbs that "hit" the same index in + * the opcode_info_arr array. The most time sensitive (or commonly used) cdb + * should be placed in opcode_info_arr[], the others should be placed here. + */ +static const struct opcode_info_t msense_iarr[] = { + {0, 0x1a, 0, F_D_IN, NULL, NULL, + {6, 0xe8, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t mselect_iarr[] = { + {0, 0x15, 0, F_D_OUT, NULL, NULL, + {6, 0xf1, 0, 0, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t read_iarr[] = { + {0, 0x28, 0, F_D_IN | FF_MEDIA_IO, resp_read_dt0, NULL,/* READ(10) */ + {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, + {0, 0x8, 0, F_D_IN | FF_MEDIA_IO, resp_read_dt0, NULL, /* READ(6) */ + {6, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0xa8, 0, F_D_IN | FF_MEDIA_IO, resp_read_dt0, NULL,/* READ(12) */ + {12, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xbf, + 0xc7, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t write_iarr[] = { + {0, 0x2a, 0, F_D_OUT | FF_MEDIA_IO, resp_write_dt0, /* WRITE(10) */ + NULL, {10, 0xfb, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7, + 0, 0, 0, 0, 0, 0} }, + {0, 0xa, 0, F_D_OUT | FF_MEDIA_IO, resp_write_dt0, /* WRITE(6) */ + NULL, {6, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0} }, + {0, 0xaa, 0, F_D_OUT | FF_MEDIA_IO, resp_write_dt0, /* WRITE(12) */ + NULL, {12, 0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xbf, 0xc7, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t sa_in_16_iarr[] = { + {0, 0x9e, 0x12, F_SA_LOW | F_D_IN, resp_get_lba_status, NULL, + {16, 0x12, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0, 0xc7} }, /* GET LBA STATUS(16) */ +}; + +static const struct opcode_info_t vl_iarr[] = { /* VARIABLE LENGTH */ + {0, 0x7f, 0xb, F_SA_HIGH | F_D_OUT | FF_MEDIA_IO, resp_write_dt0, + NULL, {32, 0xc7, 0, 0, 0, 0, 0x3f, 0x18, 0x0, 0xb, 0xfa, + 0, 0xff, 0xff, 0xff, 0xff} }, /* WRITE(32) */ + {0, 0x7f, 0x11, F_SA_HIGH | F_D_OUT | FF_MEDIA_IO, resp_write_scat, + NULL, {32, 0xc7, 0, 0, 0, 0, 0x3f, 0x18, 0x0, 0x11, 0xf8, + 0, 0xff, 0xff, 0x0, 0x0} }, /* WRITE SCATTERED(32) */ +}; + +static const struct opcode_info_t maint_in_iarr[] = { /* MAINT IN */ + {0, 0xa3, 0xc, F_SA_LOW | F_D_IN, resp_rsup_opcodes, NULL, + {12, 0xc, 0x87, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, + 0xc7, 0, 0, 0, 0} }, /* REPORT SUPPORTED OPERATION CODES */ + {0, 0xa3, 0xd, F_SA_LOW | F_D_IN, resp_rsup_tmfs, NULL, + {12, 0xd, 0x80, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0, + 0, 0} }, /* REPORTED SUPPORTED TASK MANAGEMENT FUNCTIONS */ +}; + +static const struct opcode_info_t write_same_iarr[] = { + {0, 0x93, 0, F_D_OUT_MAYBE | FF_MEDIA_IO, resp_write_same_16, NULL, + {16, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0x3f, 0xc7} }, /* WRITE SAME(16) */ +}; + +static const struct opcode_info_t reserve_iarr[] = { + {0, 0x16, 0, F_D_OUT, NULL, NULL, /* RESERVE(6) */ + {6, 0x1f, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t release_iarr[] = { + {0, 0x17, 0, F_D_OUT, NULL, NULL, /* RELEASE(6) */ + {6, 0x1f, 0xff, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static const struct opcode_info_t sync_cache_iarr[] = { + {0, 0x91, 0, F_SYNC_DELAY | F_M_ACCESS, resp_sync_cache, NULL, + {16, 0x6, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0x3f, 0xc7} }, /* SYNC_CACHE (16) */ +}; + + +/* This array is accessed via SDEB_I_* values. Make sure all are mapped, + * plus the terminating elements for logic that scans this table such as + * REPORT SUPPORTED OPERATION CODES. */ +static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEMENT + 1] = { +/* 0 */ + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* unknown opcodes */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x12, 0, FF_RESPOND | F_D_IN, resp_inquiry, NULL, /* INQUIRY */ + {6, 0xe3, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0xa0, 0, FF_RESPOND | F_D_IN, resp_report_luns, NULL, + {12, 0xe3, 0xff, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0, + 0, 0} }, /* REPORT LUNS */ + {0, 0x3, 0, FF_RESPOND | F_D_IN, resp_requests, NULL, + {6, 0xe1, 0, 0, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x0, 0, F_M_ACCESS | F_RL_WLUN_OK, NULL, NULL,/* TEST UNIT READY */ + {6, 0, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +/* 5 */ + {ARRAY_SIZE(msense_iarr), 0x5a, 0, F_D_IN, /* MODE SENSE(10) */ + resp_mode_sense, msense_iarr, {10, 0xf8, 0xff, 0xff, 0, 0, 0, + 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} }, + {ARRAY_SIZE(mselect_iarr), 0x55, 0, F_D_OUT, /* MODE SELECT(10) */ + resp_mode_select, mselect_iarr, {10, 0xf1, 0, 0, 0, 0, 0, 0xff, + 0xff, 0xc7, 0, 0, 0, 0, 0, 0} }, + {0, 0x4d, 0, F_D_IN, resp_log_sense, NULL, /* LOG SENSE */ + {10, 0xe3, 0xff, 0xff, 0, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, + 0, 0, 0} }, + {0, 0x25, 0, F_D_IN, resp_readcap, NULL, /* READ CAPACITY(10) */ + {10, 0xe1, 0xff, 0xff, 0xff, 0xff, 0, 0, 0x1, 0xc7, 0, 0, 0, 0, + 0, 0} }, + {ARRAY_SIZE(read_iarr), 0x88, 0, F_D_IN | FF_MEDIA_IO, /* READ(16) */ + resp_read_dt0, read_iarr, {16, 0xfe, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7} }, +/* 10 */ + {ARRAY_SIZE(write_iarr), 0x8a, 0, F_D_OUT | FF_MEDIA_IO, + resp_write_dt0, write_iarr, /* WRITE(16) */ + {16, 0xfa, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7} }, + {0, 0x1b, 0, F_SSU_DELAY, resp_start_stop, NULL,/* START STOP UNIT */ + {6, 0x1, 0, 0xf, 0xf7, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {ARRAY_SIZE(sa_in_16_iarr), 0x9e, 0x10, F_SA_LOW | F_D_IN, + resp_readcap16, sa_in_16_iarr, /* SA_IN(16), READ CAPACITY(16) */ + {16, 0x10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0x1, 0xc7} }, + {0, 0x9f, 0x12, F_SA_LOW | F_D_OUT | FF_MEDIA_IO, resp_write_scat, + NULL, {16, 0x12, 0xf9, 0x0, 0xff, 0xff, 0, 0, 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, 0xff, 0xc7} }, /* SA_OUT(16), WRITE SCAT(16) */ + {ARRAY_SIZE(maint_in_iarr), 0xa3, 0xa, F_SA_LOW | F_D_IN, + resp_report_tgtpgs, /* MAINT IN, REPORT TARGET PORT GROUPS */ + maint_in_iarr, {12, 0xea, 0, 0, 0, 0, 0xff, 0xff, 0xff, + 0xff, 0, 0xc7, 0, 0, 0, 0} }, +/* 15 */ + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* MAINT OUT */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x2f, 0, F_D_OUT_MAYBE | FF_MEDIA_IO, NULL, NULL, /* VERIFY(10) */ + {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7, + 0, 0, 0, 0, 0, 0} }, + {ARRAY_SIZE(vl_iarr), 0x7f, 0x9, F_SA_HIGH | F_D_IN | FF_MEDIA_IO, + resp_read_dt0, vl_iarr, /* VARIABLE LENGTH, READ(32) */ + {32, 0xc7, 0, 0, 0, 0, 0x3f, 0x18, 0x0, 0x9, 0xfe, 0, 0xff, 0xff, + 0xff, 0xff} }, + {ARRAY_SIZE(reserve_iarr), 0x56, 0, F_D_OUT, + NULL, reserve_iarr, /* RESERVE(10) <no response function> */ + {10, 0xff, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, + 0} }, + {ARRAY_SIZE(release_iarr), 0x57, 0, F_D_OUT, + NULL, release_iarr, /* RELEASE(10) <no response function> */ + {10, 0x13, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, + 0} }, +/* 20 */ + {0, 0x1e, 0, 0, NULL, NULL, /* ALLOW REMOVAL */ + {6, 0, 0, 0, 0x3, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x1, 0, 0, resp_start_stop, NULL, /* REWIND ?? */ + {6, 0x1, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* ATA_PT */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x1d, F_D_OUT, 0, NULL, NULL, /* SEND DIAGNOSTIC */ + {6, 0xf7, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, + {0, 0x42, 0, F_D_OUT | FF_MEDIA_IO, resp_unmap, NULL, /* UNMAP */ + {10, 0x1, 0, 0, 0, 0, 0x3f, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} }, +/* 25 */ + {0, 0x53, 0, F_D_IN | F_D_OUT | FF_MEDIA_IO, resp_xdwriteread_10, + NULL, {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7, + 0, 0, 0, 0, 0, 0} }, /* XDWRITEREAD(10) */ + {0, 0x3b, 0, F_D_OUT_MAYBE, resp_write_buffer, NULL, + {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, /* WRITE_BUFFER */ + {ARRAY_SIZE(write_same_iarr), 0x41, 0, F_D_OUT_MAYBE | FF_MEDIA_IO, + resp_write_same_10, write_same_iarr, /* WRITE SAME(10) */ + {10, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7, 0, + 0, 0, 0, 0, 0} }, + {ARRAY_SIZE(sync_cache_iarr), 0x35, 0, F_SYNC_DELAY | F_M_ACCESS, + resp_sync_cache, sync_cache_iarr, + {10, 0x7, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xff, 0xff, 0xc7, 0, 0, + 0, 0, 0, 0} }, /* SYNC_CACHE (10) */ + {0, 0x89, 0, F_D_OUT | FF_MEDIA_IO, resp_comp_write, NULL, + {16, 0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0, + 0, 0xff, 0x3f, 0xc7} }, /* COMPARE AND WRITE */ + +/* 30 */ + {0xff, 0, 0, 0, NULL, NULL, /* terminating element */ + {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} }, +}; + +static int sdebug_add_host = DEF_NUM_HOST; +static int sdebug_ato = DEF_ATO; +static int sdebug_cdb_len = DEF_CDB_LEN; +static int sdebug_jdelay = DEF_JDELAY; /* if > 0 then unit is jiffies */ +static int sdebug_dev_size_mb = DEF_DEV_SIZE_MB; +static int sdebug_dif = DEF_DIF; +static int sdebug_dix = DEF_DIX; +static int sdebug_dsense = DEF_D_SENSE; +static int sdebug_every_nth = DEF_EVERY_NTH; +static int sdebug_fake_rw = DEF_FAKE_RW; +static unsigned int sdebug_guard = DEF_GUARD; +static int sdebug_lowest_aligned = DEF_LOWEST_ALIGNED; +static int sdebug_max_luns = DEF_MAX_LUNS; +static int sdebug_max_queue = SDEBUG_CANQUEUE; /* per submit queue */ +static unsigned int sdebug_medium_error_start = OPT_MEDIUM_ERR_ADDR; +static int sdebug_medium_error_count = OPT_MEDIUM_ERR_NUM; +static atomic_t retired_max_queue; /* if > 0 then was prior max_queue */ +static int sdebug_ndelay = DEF_NDELAY; /* if > 0 then unit is nanoseconds */ +static int sdebug_no_lun_0 = DEF_NO_LUN_0; +static int sdebug_no_uld; +static int sdebug_num_parts = DEF_NUM_PARTS; +static int sdebug_num_tgts = DEF_NUM_TGTS; /* targets per host */ +static int sdebug_opt_blks = DEF_OPT_BLKS; +static int sdebug_opts = DEF_OPTS; +static int sdebug_physblk_exp = DEF_PHYSBLK_EXP; +static int sdebug_opt_xferlen_exp = DEF_OPT_XFERLEN_EXP; +static int sdebug_ptype = DEF_PTYPE; /* SCSI peripheral device type */ +static int sdebug_scsi_level = DEF_SCSI_LEVEL; +static int sdebug_sector_size = DEF_SECTOR_SIZE; +static int sdebug_virtual_gb = DEF_VIRTUAL_GB; +static int sdebug_vpd_use_hostno = DEF_VPD_USE_HOSTNO; +static unsigned int sdebug_lbpu = DEF_LBPU; +static unsigned int sdebug_lbpws = DEF_LBPWS; +static unsigned int sdebug_lbpws10 = DEF_LBPWS10; +static unsigned int sdebug_lbprz = DEF_LBPRZ; +static unsigned int sdebug_unmap_alignment = DEF_UNMAP_ALIGNMENT; +static unsigned int sdebug_unmap_granularity = DEF_UNMAP_GRANULARITY; +static unsigned int sdebug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS; +static unsigned int sdebug_unmap_max_desc = DEF_UNMAP_MAX_DESC; +static unsigned int sdebug_write_same_length = DEF_WRITESAME_LENGTH; +static int sdebug_uuid_ctl = DEF_UUID_CTL; +static bool sdebug_removable = DEF_REMOVABLE; +static bool sdebug_clustering; +static bool sdebug_host_lock = DEF_HOST_LOCK; +static bool sdebug_strict = DEF_STRICT; +static bool sdebug_any_injecting_opt; +static bool sdebug_verbose; +static bool have_dif_prot; +static bool write_since_sync; +static bool sdebug_statistics = DEF_STATISTICS; + +static unsigned int sdebug_store_sectors; +static sector_t sdebug_capacity; /* in sectors */ + +/* old BIOS stuff, kernel may get rid of them but some mode sense pages + may still need them */ +static int sdebug_heads; /* heads per disk */ +static int sdebug_cylinders_per; /* cylinders per surface */ +static int sdebug_sectors_per; /* sectors per cylinder */ + +static LIST_HEAD(sdebug_host_list); +static DEFINE_SPINLOCK(sdebug_host_list_lock); + +static unsigned char *fake_storep; /* ramdisk storage */ +static struct t10_pi_tuple *dif_storep; /* protection info */ +static void *map_storep; /* provisioning map */ + +static unsigned long map_size; +static int num_aborts; +static int num_dev_resets; +static int num_target_resets; +static int num_bus_resets; +static int num_host_resets; +static int dix_writes; +static int dix_reads; +static int dif_errors; + +static int submit_queues = DEF_SUBMIT_QUEUES; /* > 1 for multi-queue (mq) */ +static struct sdebug_queue *sdebug_q_arr; /* ptr to array of submit queues */ + +static DEFINE_RWLOCK(atomic_rw); + +static char sdebug_proc_name[] = MY_NAME; +static const char *my_name = MY_NAME; + +static struct bus_type pseudo_lld_bus; + +static struct device_driver sdebug_driverfs_driver = { + .name = sdebug_proc_name, + .bus = &pseudo_lld_bus, +}; + +static const int check_condition_result = + (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION; + +static const int illegal_condition_result = + (DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION; + +static const int device_qfull_result = + (DID_OK << 16) | (COMMAND_COMPLETE << 8) | SAM_STAT_TASK_SET_FULL; + + +/* Only do the extra work involved in logical block provisioning if one or + * more of the lbpu, lbpws or lbpws10 parameters are given and we are doing + * real reads and writes (i.e. not skipping them for speed). + */ +static inline bool scsi_debug_lbp(void) +{ + return 0 == sdebug_fake_rw && + (sdebug_lbpu || sdebug_lbpws || sdebug_lbpws10); +} + +static void *lba2fake_store(unsigned long long lba) +{ + lba = do_div(lba, sdebug_store_sectors); + + return fake_storep + lba * sdebug_sector_size; +} + +static struct t10_pi_tuple *dif_store(sector_t sector) +{ + sector = sector_div(sector, sdebug_store_sectors); + + return dif_storep + sector; +} + +static void sdebug_max_tgts_luns(void) +{ + struct sdebug_host_info *sdbg_host; + struct Scsi_Host *hpnt; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { + hpnt = sdbg_host->shost; + if ((hpnt->this_id >= 0) && + (sdebug_num_tgts > hpnt->this_id)) + hpnt->max_id = sdebug_num_tgts + 1; + else + hpnt->max_id = sdebug_num_tgts; + /* sdebug_max_luns; */ + hpnt->max_lun = SCSI_W_LUN_REPORT_LUNS + 1; + } + spin_unlock(&sdebug_host_list_lock); +} + +enum sdeb_cmd_data {SDEB_IN_DATA = 0, SDEB_IN_CDB = 1}; + +/* Set in_bit to -1 to indicate no bit position of invalid field */ +static void mk_sense_invalid_fld(struct scsi_cmnd *scp, + enum sdeb_cmd_data c_d, + int in_byte, int in_bit) +{ + unsigned char *sbuff; + u8 sks[4]; + int sl, asc; + + sbuff = scp->sense_buffer; + if (!sbuff) { + sdev_printk(KERN_ERR, scp->device, + "%s: sense_buffer is NULL\n", __func__); + return; + } + asc = c_d ? INVALID_FIELD_IN_CDB : INVALID_FIELD_IN_PARAM_LIST; + memset(sbuff, 0, SCSI_SENSE_BUFFERSIZE); + scsi_build_sense_buffer(sdebug_dsense, sbuff, ILLEGAL_REQUEST, asc, 0); + memset(sks, 0, sizeof(sks)); + sks[0] = 0x80; + if (c_d) + sks[0] |= 0x40; + if (in_bit >= 0) { + sks[0] |= 0x8; + sks[0] |= 0x7 & in_bit; + } + put_unaligned_be16(in_byte, sks + 1); + if (sdebug_dsense) { + sl = sbuff[7] + 8; + sbuff[7] = sl; + sbuff[sl] = 0x2; + sbuff[sl + 1] = 0x6; + memcpy(sbuff + sl + 4, sks, 3); + } else + memcpy(sbuff + 15, sks, 3); + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, "%s: [sense_key,asc,ascq" + "]: [0x5,0x%x,0x0] %c byte=%d, bit=%d\n", + my_name, asc, c_d ? 'C' : 'D', in_byte, in_bit); +} + +static void mk_sense_buffer(struct scsi_cmnd *scp, int key, int asc, int asq) +{ + unsigned char *sbuff; + + sbuff = scp->sense_buffer; + if (!sbuff) { + sdev_printk(KERN_ERR, scp->device, + "%s: sense_buffer is NULL\n", __func__); + return; + } + memset(sbuff, 0, SCSI_SENSE_BUFFERSIZE); + + scsi_build_sense_buffer(sdebug_dsense, sbuff, key, asc, asq); + + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s: [sense_key,asc,ascq]: [0x%x,0x%x,0x%x]\n", + my_name, key, asc, asq); +} + +static void mk_sense_invalid_opcode(struct scsi_cmnd *scp) +{ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_OPCODE, 0); +} + +static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg) +{ + if (sdebug_verbose) { + if (0x1261 == cmd) + sdev_printk(KERN_INFO, dev, + "%s: BLKFLSBUF [0x1261]\n", __func__); + else if (0x5331 == cmd) + sdev_printk(KERN_INFO, dev, + "%s: CDROM_GET_CAPABILITY [0x5331]\n", + __func__); + else + sdev_printk(KERN_INFO, dev, "%s: cmd=0x%x\n", + __func__, cmd); + } + return -EINVAL; + /* return -ENOTTY; // correct return but upsets fdisk */ +} + +static void config_cdb_len(struct scsi_device *sdev) +{ + switch (sdebug_cdb_len) { + case 6: /* suggest 6 byte READ, WRITE and MODE SENSE/SELECT */ + sdev->use_10_for_rw = false; + sdev->use_16_for_rw = false; + sdev->use_10_for_ms = false; + break; + case 10: /* suggest 10 byte RWs and 6 byte MODE SENSE/SELECT */ + sdev->use_10_for_rw = true; + sdev->use_16_for_rw = false; + sdev->use_10_for_ms = false; + break; + case 12: /* suggest 10 byte RWs and 10 byte MODE SENSE/SELECT */ + sdev->use_10_for_rw = true; + sdev->use_16_for_rw = false; + sdev->use_10_for_ms = true; + break; + case 16: + sdev->use_10_for_rw = false; + sdev->use_16_for_rw = true; + sdev->use_10_for_ms = true; + break; + case 32: /* No knobs to suggest this so same as 16 for now */ + sdev->use_10_for_rw = false; + sdev->use_16_for_rw = true; + sdev->use_10_for_ms = true; + break; + default: + pr_warn("unexpected cdb_len=%d, force to 10\n", + sdebug_cdb_len); + sdev->use_10_for_rw = true; + sdev->use_16_for_rw = false; + sdev->use_10_for_ms = false; + sdebug_cdb_len = 10; + break; + } +} + +static void all_config_cdb_len(void) +{ + struct sdebug_host_info *sdbg_host; + struct Scsi_Host *shost; + struct scsi_device *sdev; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { + shost = sdbg_host->shost; + shost_for_each_device(sdev, shost) { + config_cdb_len(sdev); + } + } + spin_unlock(&sdebug_host_list_lock); +} + +static void clear_luns_changed_on_target(struct sdebug_dev_info *devip) +{ + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, dev_list) { + if ((devip->sdbg_host == dp->sdbg_host) && + (devip->target == dp->target)) + clear_bit(SDEBUG_UA_LUNS_CHANGED, dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); +} + +static int make_ua(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + int k; + + k = find_first_bit(devip->uas_bm, SDEBUG_NUM_UAS); + if (k != SDEBUG_NUM_UAS) { + const char *cp = NULL; + + switch (k) { + case SDEBUG_UA_POR: + mk_sense_buffer(scp, UNIT_ATTENTION, UA_RESET_ASC, + POWER_ON_RESET_ASCQ); + if (sdebug_verbose) + cp = "power on reset"; + break; + case SDEBUG_UA_BUS_RESET: + mk_sense_buffer(scp, UNIT_ATTENTION, UA_RESET_ASC, + BUS_RESET_ASCQ); + if (sdebug_verbose) + cp = "bus reset"; + break; + case SDEBUG_UA_MODE_CHANGED: + mk_sense_buffer(scp, UNIT_ATTENTION, UA_CHANGED_ASC, + MODE_CHANGED_ASCQ); + if (sdebug_verbose) + cp = "mode parameters changed"; + break; + case SDEBUG_UA_CAPACITY_CHANGED: + mk_sense_buffer(scp, UNIT_ATTENTION, UA_CHANGED_ASC, + CAPACITY_CHANGED_ASCQ); + if (sdebug_verbose) + cp = "capacity data changed"; + break; + case SDEBUG_UA_MICROCODE_CHANGED: + mk_sense_buffer(scp, UNIT_ATTENTION, + TARGET_CHANGED_ASC, + MICROCODE_CHANGED_ASCQ); + if (sdebug_verbose) + cp = "microcode has been changed"; + break; + case SDEBUG_UA_MICROCODE_CHANGED_WO_RESET: + mk_sense_buffer(scp, UNIT_ATTENTION, + TARGET_CHANGED_ASC, + MICROCODE_CHANGED_WO_RESET_ASCQ); + if (sdebug_verbose) + cp = "microcode has been changed without reset"; + break; + case SDEBUG_UA_LUNS_CHANGED: + /* + * SPC-3 behavior is to report a UNIT ATTENTION with + * ASC/ASCQ REPORTED LUNS DATA HAS CHANGED on every LUN + * on the target, until a REPORT LUNS command is + * received. SPC-4 behavior is to report it only once. + * NOTE: sdebug_scsi_level does not use the same + * values as struct scsi_device->scsi_level. + */ + if (sdebug_scsi_level >= 6) /* SPC-4 and above */ + clear_luns_changed_on_target(devip); + mk_sense_buffer(scp, UNIT_ATTENTION, + TARGET_CHANGED_ASC, + LUNS_CHANGED_ASCQ); + if (sdebug_verbose) + cp = "reported luns data has changed"; + break; + default: + pr_warn("unexpected unit attention code=%d\n", k); + if (sdebug_verbose) + cp = "unknown"; + break; + } + clear_bit(k, devip->uas_bm); + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s reports: Unit attention: %s\n", + my_name, cp); + return check_condition_result; + } + return 0; +} + +/* Build SCSI "data-in" buffer. Returns 0 if ok else (DID_ERROR << 16). */ +static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr, + int arr_len) +{ + int act_len; + struct scsi_data_buffer *sdb = scsi_in(scp); + + if (!sdb->length) + return 0; + if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE)) + return DID_ERROR << 16; + + act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents, + arr, arr_len); + sdb->resid = scsi_bufflen(scp) - act_len; + + return 0; +} + +/* Partial build of SCSI "data-in" buffer. Returns 0 if ok else + * (DID_ERROR << 16). Can write to offset in data-in buffer. If multiple + * calls, not required to write in ascending offset order. Assumes resid + * set to scsi_bufflen() prior to any calls. + */ +static int p_fill_from_dev_buffer(struct scsi_cmnd *scp, const void *arr, + int arr_len, unsigned int off_dst) +{ + int act_len, n; + struct scsi_data_buffer *sdb = scsi_in(scp); + off_t skip = off_dst; + + if (sdb->length <= off_dst) + return 0; + if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE)) + return DID_ERROR << 16; + + act_len = sg_pcopy_from_buffer(sdb->table.sgl, sdb->table.nents, + arr, arr_len, skip); + pr_debug("%s: off_dst=%u, scsi_bufflen=%u, act_len=%u, resid=%d\n", + __func__, off_dst, scsi_bufflen(scp), act_len, sdb->resid); + n = (int)scsi_bufflen(scp) - ((int)off_dst + act_len); + sdb->resid = min(sdb->resid, n); + return 0; +} + +/* Fetches from SCSI "data-out" buffer. Returns number of bytes fetched into + * 'arr' or -1 if error. + */ +static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr, + int arr_len) +{ + if (!scsi_bufflen(scp)) + return 0; + if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE)) + return -1; + + return scsi_sg_copy_to_buffer(scp, arr, arr_len); +} + + +static char sdebug_inq_vendor_id[9] = "Linux "; +static char sdebug_inq_product_id[17] = "scsi_debug "; +static char sdebug_inq_product_rev[5] = SDEBUG_VERSION; +/* Use some locally assigned NAAs for SAS addresses. */ +static const u64 naa3_comp_a = 0x3222222000000000ULL; +static const u64 naa3_comp_b = 0x3333333000000000ULL; +static const u64 naa3_comp_c = 0x3111111000000000ULL; + +/* Device identification VPD page. Returns number of bytes placed in arr */ +static int inquiry_vpd_83(unsigned char *arr, int port_group_id, + int target_dev_id, int dev_id_num, + const char *dev_id_str, int dev_id_str_len, + const uuid_t *lu_name) +{ + int num, port_a; + char b[32]; + + port_a = target_dev_id + 1; + /* T10 vendor identifier field format (faked) */ + arr[0] = 0x2; /* ASCII */ + arr[1] = 0x1; + arr[2] = 0x0; + memcpy(&arr[4], sdebug_inq_vendor_id, 8); + memcpy(&arr[12], sdebug_inq_product_id, 16); + memcpy(&arr[28], dev_id_str, dev_id_str_len); + num = 8 + 16 + dev_id_str_len; + arr[3] = num; + num += 4; + if (dev_id_num >= 0) { + if (sdebug_uuid_ctl) { + /* Locally assigned UUID */ + arr[num++] = 0x1; /* binary (not necessarily sas) */ + arr[num++] = 0xa; /* PIV=0, lu, naa */ + arr[num++] = 0x0; + arr[num++] = 0x12; + arr[num++] = 0x10; /* uuid type=1, locally assigned */ + arr[num++] = 0x0; + memcpy(arr + num, lu_name, 16); + num += 16; + } else { + /* NAA-3, Logical unit identifier (binary) */ + arr[num++] = 0x1; /* binary (not necessarily sas) */ + arr[num++] = 0x3; /* PIV=0, lu, naa */ + arr[num++] = 0x0; + arr[num++] = 0x8; + put_unaligned_be64(naa3_comp_b + dev_id_num, arr + num); + num += 8; + } + /* Target relative port number */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x94; /* PIV=1, target port, rel port */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x4; /* length */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + arr[num++] = 0x1; /* relative port A */ + } + /* NAA-3, Target port identifier */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x93; /* piv=1, target port, naa */ + arr[num++] = 0x0; + arr[num++] = 0x8; + put_unaligned_be64(naa3_comp_a + port_a, arr + num); + num += 8; + /* NAA-3, Target port group identifier */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x95; /* piv=1, target port group id */ + arr[num++] = 0x0; + arr[num++] = 0x4; + arr[num++] = 0; + arr[num++] = 0; + put_unaligned_be16(port_group_id, arr + num); + num += 2; + /* NAA-3, Target device identifier */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0xa3; /* piv=1, target device, naa */ + arr[num++] = 0x0; + arr[num++] = 0x8; + put_unaligned_be64(naa3_comp_a + target_dev_id, arr + num); + num += 8; + /* SCSI name string: Target device identifier */ + arr[num++] = 0x63; /* proto=sas, UTF-8 */ + arr[num++] = 0xa8; /* piv=1, target device, SCSI name string */ + arr[num++] = 0x0; + arr[num++] = 24; + memcpy(arr + num, "naa.32222220", 12); + num += 12; + snprintf(b, sizeof(b), "%08X", target_dev_id); + memcpy(arr + num, b, 8); + num += 8; + memset(arr + num, 0, 4); + num += 4; + return num; +} + +static unsigned char vpd84_data[] = { +/* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0, + 0x22,0x22,0x22,0x0,0xbb,0x1, + 0x22,0x22,0x22,0x0,0xbb,0x2, +}; + +/* Software interface identification VPD page */ +static int inquiry_vpd_84(unsigned char *arr) +{ + memcpy(arr, vpd84_data, sizeof(vpd84_data)); + return sizeof(vpd84_data); +} + +/* Management network addresses VPD page */ +static int inquiry_vpd_85(unsigned char *arr) +{ + int num = 0; + const char *na1 = "https://www.kernel.org/config"; + const char *na2 = "http://www.kernel.org/log"; + int plen, olen; + + arr[num++] = 0x1; /* lu, storage config */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + olen = strlen(na1); + plen = olen + 1; + if (plen % 4) + plen = ((plen / 4) + 1) * 4; + arr[num++] = plen; /* length, null termianted, padded */ + memcpy(arr + num, na1, olen); + memset(arr + num + olen, 0, plen - olen); + num += plen; + + arr[num++] = 0x4; /* lu, logging */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + olen = strlen(na2); + plen = olen + 1; + if (plen % 4) + plen = ((plen / 4) + 1) * 4; + arr[num++] = plen; /* length, null terminated, padded */ + memcpy(arr + num, na2, olen); + memset(arr + num + olen, 0, plen - olen); + num += plen; + + return num; +} + +/* SCSI ports VPD page */ +static int inquiry_vpd_88(unsigned char *arr, int target_dev_id) +{ + int num = 0; + int port_a, port_b; + + port_a = target_dev_id + 1; + port_b = port_a + 1; + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + arr[num++] = 0x1; /* relative port 1 (primary) */ + memset(arr + num, 0, 6); + num += 6; + arr[num++] = 0x0; + arr[num++] = 12; /* length tp descriptor */ + /* naa-5 target port identifier (A) */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x93; /* PIV=1, target port, NAA */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x8; /* length */ + put_unaligned_be64(naa3_comp_a + port_a, arr + num); + num += 8; + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x0; + arr[num++] = 0x2; /* relative port 2 (secondary) */ + memset(arr + num, 0, 6); + num += 6; + arr[num++] = 0x0; + arr[num++] = 12; /* length tp descriptor */ + /* naa-5 target port identifier (B) */ + arr[num++] = 0x61; /* proto=sas, binary */ + arr[num++] = 0x93; /* PIV=1, target port, NAA */ + arr[num++] = 0x0; /* reserved */ + arr[num++] = 0x8; /* length */ + put_unaligned_be64(naa3_comp_a + port_b, arr + num); + num += 8; + + return num; +} + + +static unsigned char vpd89_data[] = { +/* from 4th byte */ 0,0,0,0, +'l','i','n','u','x',' ',' ',' ', +'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ', +'1','2','3','4', +0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0, +0xec,0,0,0, +0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0, +0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20, +0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33, +0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31, +0x53,0x41, +0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, +0x20,0x20, +0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, +0x10,0x80, +0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0, +0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0, +0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0, +0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40, +0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0, +0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42, +0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8, +0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe, +0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51, +}; + +/* ATA Information VPD page */ +static int inquiry_vpd_89(unsigned char *arr) +{ + memcpy(arr, vpd89_data, sizeof(vpd89_data)); + return sizeof(vpd89_data); +} + + +static unsigned char vpdb0_data[] = { + /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, + 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, +}; + +/* Block limits VPD page (SBC-3) */ +static int inquiry_vpd_b0(unsigned char *arr) +{ + unsigned int gran; + + memcpy(arr, vpdb0_data, sizeof(vpdb0_data)); + + /* Optimal transfer length granularity */ + if (sdebug_opt_xferlen_exp != 0 && + sdebug_physblk_exp < sdebug_opt_xferlen_exp) + gran = 1 << sdebug_opt_xferlen_exp; + else + gran = 1 << sdebug_physblk_exp; + put_unaligned_be16(gran, arr + 2); + + /* Maximum Transfer Length */ + if (sdebug_store_sectors > 0x400) + put_unaligned_be32(sdebug_store_sectors, arr + 4); + + /* Optimal Transfer Length */ + put_unaligned_be32(sdebug_opt_blks, &arr[8]); + + if (sdebug_lbpu) { + /* Maximum Unmap LBA Count */ + put_unaligned_be32(sdebug_unmap_max_blocks, &arr[16]); + + /* Maximum Unmap Block Descriptor Count */ + put_unaligned_be32(sdebug_unmap_max_desc, &arr[20]); + } + + /* Unmap Granularity Alignment */ + if (sdebug_unmap_alignment) { + put_unaligned_be32(sdebug_unmap_alignment, &arr[28]); + arr[28] |= 0x80; /* UGAVALID */ + } + + /* Optimal Unmap Granularity */ + put_unaligned_be32(sdebug_unmap_granularity, &arr[24]); + + /* Maximum WRITE SAME Length */ + put_unaligned_be64(sdebug_write_same_length, &arr[32]); + + return 0x3c; /* Mandatory page length for Logical Block Provisioning */ + + return sizeof(vpdb0_data); +} + +/* Block device characteristics VPD page (SBC-3) */ +static int inquiry_vpd_b1(unsigned char *arr) +{ + memset(arr, 0, 0x3c); + arr[0] = 0; + arr[1] = 1; /* non rotating medium (e.g. solid state) */ + arr[2] = 0; + arr[3] = 5; /* less than 1.8" */ + + return 0x3c; +} + +/* Logical block provisioning VPD page (SBC-4) */ +static int inquiry_vpd_b2(unsigned char *arr) +{ + memset(arr, 0, 0x4); + arr[0] = 0; /* threshold exponent */ + if (sdebug_lbpu) + arr[1] = 1 << 7; + if (sdebug_lbpws) + arr[1] |= 1 << 6; + if (sdebug_lbpws10) + arr[1] |= 1 << 5; + if (sdebug_lbprz && scsi_debug_lbp()) + arr[1] |= (sdebug_lbprz & 0x7) << 2; /* sbc4r07 and later */ + /* anc_sup=0; dp=0 (no provisioning group descriptor) */ + /* minimum_percentage=0; provisioning_type=0 (unknown) */ + /* threshold_percentage=0 */ + return 0x4; +} + +#define SDEBUG_LONG_INQ_SZ 96 +#define SDEBUG_MAX_INQ_ARR_SZ 584 + +static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + unsigned char pq_pdt; + unsigned char *arr; + unsigned char *cmd = scp->cmnd; + int alloc_len, n, ret; + bool have_wlun, is_disk; + + alloc_len = get_unaligned_be16(cmd + 3); + arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC); + if (! arr) + return DID_REQUEUE << 16; + is_disk = (sdebug_ptype == TYPE_DISK); + have_wlun = scsi_is_wlun(scp->device->lun); + if (have_wlun) + pq_pdt = TYPE_WLUN; /* present, wlun */ + else if (sdebug_no_lun_0 && (devip->lun == SDEBUG_LUN_0_VAL)) + pq_pdt = 0x7f; /* not present, PQ=3, PDT=0x1f */ + else + pq_pdt = (sdebug_ptype & 0x1f); + arr[0] = pq_pdt; + if (0x2 & cmd[1]) { /* CMDDT bit set */ + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 1); + kfree(arr); + return check_condition_result; + } else if (0x1 & cmd[1]) { /* EVPD bit set */ + int lu_id_num, port_group_id, target_dev_id, len; + char lu_id_str[6]; + int host_no = devip->sdbg_host->shost->host_no; + + port_group_id = (((host_no + 1) & 0x7f) << 8) + + (devip->channel & 0x7f); + if (sdebug_vpd_use_hostno == 0) + host_no = 0; + lu_id_num = have_wlun ? -1 : (((host_no + 1) * 2000) + + (devip->target * 1000) + devip->lun); + target_dev_id = ((host_no + 1) * 2000) + + (devip->target * 1000) - 3; + len = scnprintf(lu_id_str, 6, "%d", lu_id_num); + if (0 == cmd[2]) { /* supported vital product data pages */ + arr[1] = cmd[2]; /*sanity */ + n = 4; + arr[n++] = 0x0; /* this page */ + arr[n++] = 0x80; /* unit serial number */ + arr[n++] = 0x83; /* device identification */ + arr[n++] = 0x84; /* software interface ident. */ + arr[n++] = 0x85; /* management network addresses */ + arr[n++] = 0x86; /* extended inquiry */ + arr[n++] = 0x87; /* mode page policy */ + arr[n++] = 0x88; /* SCSI ports */ + if (is_disk) { /* SBC only */ + arr[n++] = 0x89; /* ATA information */ + arr[n++] = 0xb0; /* Block limits */ + arr[n++] = 0xb1; /* Block characteristics */ + arr[n++] = 0xb2; /* Logical Block Prov */ + } + arr[3] = n - 4; /* number of supported VPD pages */ + } else if (0x80 == cmd[2]) { /* unit serial number */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = len; + memcpy(&arr[4], lu_id_str, len); + } else if (0x83 == cmd[2]) { /* device identification */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_83(&arr[4], port_group_id, + target_dev_id, lu_id_num, + lu_id_str, len, + &devip->lu_name); + } else if (0x84 == cmd[2]) { /* Software interface ident. */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_84(&arr[4]); + } else if (0x85 == cmd[2]) { /* Management network addresses */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_85(&arr[4]); + } else if (0x86 == cmd[2]) { /* extended inquiry */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = 0x3c; /* number of following entries */ + if (sdebug_dif == T10_PI_TYPE3_PROTECTION) + arr[4] = 0x4; /* SPT: GRD_CHK:1 */ + else if (have_dif_prot) + arr[4] = 0x5; /* SPT: GRD_CHK:1, REF_CHK:1 */ + else + arr[4] = 0x0; /* no protection stuff */ + arr[5] = 0x7; /* head of q, ordered + simple q's */ + } else if (0x87 == cmd[2]) { /* mode page policy */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = 0x8; /* number of following entries */ + arr[4] = 0x2; /* disconnect-reconnect mp */ + arr[6] = 0x80; /* mlus, shared */ + arr[8] = 0x18; /* protocol specific lu */ + arr[10] = 0x82; /* mlus, per initiator port */ + } else if (0x88 == cmd[2]) { /* SCSI Ports */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_88(&arr[4], target_dev_id); + } else if (is_disk && 0x89 == cmd[2]) { /* ATA information */ + arr[1] = cmd[2]; /*sanity */ + n = inquiry_vpd_89(&arr[4]); + put_unaligned_be16(n, arr + 2); + } else if (is_disk && 0xb0 == cmd[2]) { /* Block limits */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_b0(&arr[4]); + } else if (is_disk && 0xb1 == cmd[2]) { /* Block char. */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_b1(&arr[4]); + } else if (is_disk && 0xb2 == cmd[2]) { /* LB Prov. */ + arr[1] = cmd[2]; /*sanity */ + arr[3] = inquiry_vpd_b2(&arr[4]); + } else { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1); + kfree(arr); + return check_condition_result; + } + len = min(get_unaligned_be16(arr + 2) + 4, alloc_len); + ret = fill_from_dev_buffer(scp, arr, + min(len, SDEBUG_MAX_INQ_ARR_SZ)); + kfree(arr); + return ret; + } + /* drops through here for a standard inquiry */ + arr[1] = sdebug_removable ? 0x80 : 0; /* Removable disk */ + arr[2] = sdebug_scsi_level; + arr[3] = 2; /* response_data_format==2 */ + arr[4] = SDEBUG_LONG_INQ_SZ - 5; + arr[5] = (int)have_dif_prot; /* PROTECT bit */ + if (sdebug_vpd_use_hostno == 0) + arr[5] |= 0x10; /* claim: implicit TPGS */ + arr[6] = 0x10; /* claim: MultiP */ + /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */ + arr[7] = 0xa; /* claim: LINKED + CMDQUE */ + memcpy(&arr[8], sdebug_inq_vendor_id, 8); + memcpy(&arr[16], sdebug_inq_product_id, 16); + memcpy(&arr[32], sdebug_inq_product_rev, 4); + /* Use Vendor Specific area to place driver date in ASCII hex */ + memcpy(&arr[36], sdebug_version_date, 8); + /* version descriptors (2 bytes each) follow */ + put_unaligned_be16(0xc0, arr + 58); /* SAM-6 no version claimed */ + put_unaligned_be16(0x5c0, arr + 60); /* SPC-5 no version claimed */ + n = 62; + if (is_disk) { /* SBC-4 no version claimed */ + put_unaligned_be16(0x600, arr + n); + n += 2; + } else if (sdebug_ptype == TYPE_TAPE) { /* SSC-4 rev 3 */ + put_unaligned_be16(0x525, arr + n); + n += 2; + } + put_unaligned_be16(0x2100, arr + n); /* SPL-4 no version claimed */ + ret = fill_from_dev_buffer(scp, arr, + min(alloc_len, SDEBUG_LONG_INQ_SZ)); + kfree(arr); + return ret; +} + +static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, + 0, 0, 0x0, 0x0}; + +static int resp_requests(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + unsigned char *sbuff; + unsigned char *cmd = scp->cmnd; + unsigned char arr[SCSI_SENSE_BUFFERSIZE]; + bool dsense; + int len = 18; + + memset(arr, 0, sizeof(arr)); + dsense = !!(cmd[1] & 1); + sbuff = scp->sense_buffer; + if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) { + if (dsense) { + arr[0] = 0x72; + arr[1] = 0x0; /* NO_SENSE in sense_key */ + arr[2] = THRESHOLD_EXCEEDED; + arr[3] = 0xff; /* TEST set and MRIE==6 */ + len = 8; + } else { + arr[0] = 0x70; + arr[2] = 0x0; /* NO_SENSE in sense_key */ + arr[7] = 0xa; /* 18 byte sense buffer */ + arr[12] = THRESHOLD_EXCEEDED; + arr[13] = 0xff; /* TEST set and MRIE==6 */ + } + } else { + memcpy(arr, sbuff, SCSI_SENSE_BUFFERSIZE); + if (arr[0] >= 0x70 && dsense == sdebug_dsense) + ; /* have sense and formats match */ + else if (arr[0] <= 0x70) { + if (dsense) { + memset(arr, 0, 8); + arr[0] = 0x72; + len = 8; + } else { + memset(arr, 0, 18); + arr[0] = 0x70; + arr[7] = 0xa; + } + } else if (dsense) { + memset(arr, 0, 8); + arr[0] = 0x72; + arr[1] = sbuff[2]; /* sense key */ + arr[2] = sbuff[12]; /* asc */ + arr[3] = sbuff[13]; /* ascq */ + len = 8; + } else { + memset(arr, 0, 18); + arr[0] = 0x70; + arr[2] = sbuff[1]; + arr[7] = 0xa; + arr[12] = sbuff[1]; + arr[13] = sbuff[3]; + } + + } + mk_sense_buffer(scp, 0, NO_ADDITIONAL_SENSE, 0); + return fill_from_dev_buffer(scp, arr, len); +} + +static int resp_start_stop(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + unsigned char *cmd = scp->cmnd; + int power_cond, stop; + bool changing; + + power_cond = (cmd[4] & 0xf0) >> 4; + if (power_cond) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 4, 7); + return check_condition_result; + } + stop = !(cmd[4] & 1); + changing = atomic_read(&devip->stopped) == !stop; + atomic_xchg(&devip->stopped, stop); + if (!changing || cmd[1] & 0x1) /* state unchanged or IMMED set */ + return SDEG_RES_IMMED_MASK; + else + return 0; +} + +static sector_t get_sdebug_capacity(void) +{ + static const unsigned int gibibyte = 1073741824; + + if (sdebug_virtual_gb > 0) + return (sector_t)sdebug_virtual_gb * + (gibibyte / sdebug_sector_size); + else + return sdebug_store_sectors; +} + +#define SDEBUG_READCAP_ARR_SZ 8 +static int resp_readcap(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + unsigned char arr[SDEBUG_READCAP_ARR_SZ]; + unsigned int capac; + + /* following just in case virtual_gb changed */ + sdebug_capacity = get_sdebug_capacity(); + memset(arr, 0, SDEBUG_READCAP_ARR_SZ); + if (sdebug_capacity < 0xffffffff) { + capac = (unsigned int)sdebug_capacity - 1; + put_unaligned_be32(capac, arr + 0); + } else + put_unaligned_be32(0xffffffff, arr + 0); + put_unaligned_be16(sdebug_sector_size, arr + 6); + return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ); +} + +#define SDEBUG_READCAP16_ARR_SZ 32 +static int resp_readcap16(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + unsigned char *cmd = scp->cmnd; + unsigned char arr[SDEBUG_READCAP16_ARR_SZ]; + int alloc_len; + + alloc_len = get_unaligned_be32(cmd + 10); + /* following just in case virtual_gb changed */ + sdebug_capacity = get_sdebug_capacity(); + memset(arr, 0, SDEBUG_READCAP16_ARR_SZ); + put_unaligned_be64((u64)(sdebug_capacity - 1), arr + 0); + put_unaligned_be32(sdebug_sector_size, arr + 8); + arr[13] = sdebug_physblk_exp & 0xf; + arr[14] = (sdebug_lowest_aligned >> 8) & 0x3f; + + if (scsi_debug_lbp()) { + arr[14] |= 0x80; /* LBPME */ + /* from sbc4r07, this LBPRZ field is 1 bit, but the LBPRZ in + * the LB Provisioning VPD page is 3 bits. Note that lbprz=2 + * in the wider field maps to 0 in this field. + */ + if (sdebug_lbprz & 1) /* precisely what the draft requires */ + arr[14] |= 0x40; + } + + arr[15] = sdebug_lowest_aligned & 0xff; + + if (have_dif_prot) { + arr[12] = (sdebug_dif - 1) << 1; /* P_TYPE */ + arr[12] |= 1; /* PROT_EN */ + } + + return fill_from_dev_buffer(scp, arr, + min(alloc_len, SDEBUG_READCAP16_ARR_SZ)); +} + +#define SDEBUG_MAX_TGTPGS_ARR_SZ 1412 + +static int resp_report_tgtpgs(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + unsigned char *cmd = scp->cmnd; + unsigned char *arr; + int host_no = devip->sdbg_host->shost->host_no; + int n, ret, alen, rlen; + int port_group_a, port_group_b, port_a, port_b; + + alen = get_unaligned_be32(cmd + 6); + arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC); + if (! arr) + return DID_REQUEUE << 16; + /* + * EVPD page 0x88 states we have two ports, one + * real and a fake port with no device connected. + * So we create two port groups with one port each + * and set the group with port B to unavailable. + */ + port_a = 0x1; /* relative port A */ + port_b = 0x2; /* relative port B */ + port_group_a = (((host_no + 1) & 0x7f) << 8) + + (devip->channel & 0x7f); + port_group_b = (((host_no + 1) & 0x7f) << 8) + + (devip->channel & 0x7f) + 0x80; + + /* + * The asymmetric access state is cycled according to the host_id. + */ + n = 4; + if (sdebug_vpd_use_hostno == 0) { + arr[n++] = host_no % 3; /* Asymm access state */ + arr[n++] = 0x0F; /* claim: all states are supported */ + } else { + arr[n++] = 0x0; /* Active/Optimized path */ + arr[n++] = 0x01; /* only support active/optimized paths */ + } + put_unaligned_be16(port_group_a, arr + n); + n += 2; + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Status code */ + arr[n++] = 0; /* Vendor unique */ + arr[n++] = 0x1; /* One port per group */ + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Reserved */ + put_unaligned_be16(port_a, arr + n); + n += 2; + arr[n++] = 3; /* Port unavailable */ + arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */ + put_unaligned_be16(port_group_b, arr + n); + n += 2; + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Status code */ + arr[n++] = 0; /* Vendor unique */ + arr[n++] = 0x1; /* One port per group */ + arr[n++] = 0; /* Reserved */ + arr[n++] = 0; /* Reserved */ + put_unaligned_be16(port_b, arr + n); + n += 2; + + rlen = n - 4; + put_unaligned_be32(rlen, arr + 0); + + /* + * Return the smallest value of either + * - The allocated length + * - The constructed command length + * - The maximum array size + */ + rlen = min(alen,n); + ret = fill_from_dev_buffer(scp, arr, + min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ)); + kfree(arr); + return ret; +} + +static int resp_rsup_opcodes(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + bool rctd; + u8 reporting_opts, req_opcode, sdeb_i, supp; + u16 req_sa, u; + u32 alloc_len, a_len; + int k, offset, len, errsts, count, bump, na; + const struct opcode_info_t *oip; + const struct opcode_info_t *r_oip; + u8 *arr; + u8 *cmd = scp->cmnd; + + rctd = !!(cmd[2] & 0x80); + reporting_opts = cmd[2] & 0x7; + req_opcode = cmd[3]; + req_sa = get_unaligned_be16(cmd + 4); + alloc_len = get_unaligned_be32(cmd + 6); + if (alloc_len < 4 || alloc_len > 0xffff) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1); + return check_condition_result; + } + if (alloc_len > 8192) + a_len = 8192; + else + a_len = alloc_len; + arr = kzalloc((a_len < 256) ? 320 : a_len + 64, GFP_ATOMIC); + if (NULL == arr) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + switch (reporting_opts) { + case 0: /* all commands */ + /* count number of commands */ + for (count = 0, oip = opcode_info_arr; + oip->num_attached != 0xff; ++oip) { + if (F_INV_OP & oip->flags) + continue; + count += (oip->num_attached + 1); + } + bump = rctd ? 20 : 8; + put_unaligned_be32(count * bump, arr); + for (offset = 4, oip = opcode_info_arr; + oip->num_attached != 0xff && offset < a_len; ++oip) { + if (F_INV_OP & oip->flags) + continue; + na = oip->num_attached; + arr[offset] = oip->opcode; + put_unaligned_be16(oip->sa, arr + offset + 2); + if (rctd) + arr[offset + 5] |= 0x2; + if (FF_SA & oip->flags) + arr[offset + 5] |= 0x1; + put_unaligned_be16(oip->len_mask[0], arr + offset + 6); + if (rctd) + put_unaligned_be16(0xa, arr + offset + 8); + r_oip = oip; + for (k = 0, oip = oip->arrp; k < na; ++k, ++oip) { + if (F_INV_OP & oip->flags) + continue; + offset += bump; + arr[offset] = oip->opcode; + put_unaligned_be16(oip->sa, arr + offset + 2); + if (rctd) + arr[offset + 5] |= 0x2; + if (FF_SA & oip->flags) + arr[offset + 5] |= 0x1; + put_unaligned_be16(oip->len_mask[0], + arr + offset + 6); + if (rctd) + put_unaligned_be16(0xa, + arr + offset + 8); + } + oip = r_oip; + offset += bump; + } + break; + case 1: /* one command: opcode only */ + case 2: /* one command: opcode plus service action */ + case 3: /* one command: if sa==0 then opcode only else opcode+sa */ + sdeb_i = opcode_ind_arr[req_opcode]; + oip = &opcode_info_arr[sdeb_i]; + if (F_INV_OP & oip->flags) { + supp = 1; + offset = 4; + } else { + if (1 == reporting_opts) { + if (FF_SA & oip->flags) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, + 2, 2); + kfree(arr); + return check_condition_result; + } + req_sa = 0; + } else if (2 == reporting_opts && + 0 == (FF_SA & oip->flags)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 4, -1); + kfree(arr); /* point at requested sa */ + return check_condition_result; + } + if (0 == (FF_SA & oip->flags) && + req_opcode == oip->opcode) + supp = 3; + else if (0 == (FF_SA & oip->flags)) { + na = oip->num_attached; + for (k = 0, oip = oip->arrp; k < na; + ++k, ++oip) { + if (req_opcode == oip->opcode) + break; + } + supp = (k >= na) ? 1 : 3; + } else if (req_sa != oip->sa) { + na = oip->num_attached; + for (k = 0, oip = oip->arrp; k < na; + ++k, ++oip) { + if (req_sa == oip->sa) + break; + } + supp = (k >= na) ? 1 : 3; + } else + supp = 3; + if (3 == supp) { + u = oip->len_mask[0]; + put_unaligned_be16(u, arr + 2); + arr[4] = oip->opcode; + for (k = 1; k < u; ++k) + arr[4 + k] = (k < 16) ? + oip->len_mask[k] : 0xff; + offset = 4 + u; + } else + offset = 4; + } + arr[1] = (rctd ? 0x80 : 0) | supp; + if (rctd) { + put_unaligned_be16(0xa, arr + offset); + offset += 12; + } + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 2); + kfree(arr); + return check_condition_result; + } + offset = (offset < a_len) ? offset : a_len; + len = (offset < alloc_len) ? offset : alloc_len; + errsts = fill_from_dev_buffer(scp, arr, len); + kfree(arr); + return errsts; +} + +static int resp_rsup_tmfs(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + bool repd; + u32 alloc_len, len; + u8 arr[16]; + u8 *cmd = scp->cmnd; + + memset(arr, 0, sizeof(arr)); + repd = !!(cmd[2] & 0x80); + alloc_len = get_unaligned_be32(cmd + 6); + if (alloc_len < 4) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1); + return check_condition_result; + } + arr[0] = 0xc8; /* ATS | ATSS | LURS */ + arr[1] = 0x1; /* ITNRS */ + if (repd) { + arr[3] = 0xc; + len = 16; + } else + len = 4; + + len = (len < alloc_len) ? len : alloc_len; + return fill_from_dev_buffer(scp, arr, len); +} + +/* <<Following mode page info copied from ST318451LW>> */ + +static int resp_err_recov_pg(unsigned char *p, int pcontrol, int target) +{ /* Read-Write Error Recovery page for mode_sense */ + unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0, + 5, 0, 0xff, 0xff}; + + memcpy(p, err_recov_pg, sizeof(err_recov_pg)); + if (1 == pcontrol) + memset(p + 2, 0, sizeof(err_recov_pg) - 2); + return sizeof(err_recov_pg); +} + +static int resp_disconnect_pg(unsigned char *p, int pcontrol, int target) +{ /* Disconnect-Reconnect page for mode_sense */ + unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0}; + + memcpy(p, disconnect_pg, sizeof(disconnect_pg)); + if (1 == pcontrol) + memset(p + 2, 0, sizeof(disconnect_pg) - 2); + return sizeof(disconnect_pg); +} + +static int resp_format_pg(unsigned char *p, int pcontrol, int target) +{ /* Format device page for mode_sense */ + unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0x40, 0, 0, 0}; + + memcpy(p, format_pg, sizeof(format_pg)); + put_unaligned_be16(sdebug_sectors_per, p + 10); + put_unaligned_be16(sdebug_sector_size, p + 12); + if (sdebug_removable) + p[20] |= 0x20; /* should agree with INQUIRY */ + if (1 == pcontrol) + memset(p + 2, 0, sizeof(format_pg) - 2); + return sizeof(format_pg); +} + +static unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, + 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, + 0, 0, 0, 0}; + +static int resp_caching_pg(unsigned char *p, int pcontrol, int target) +{ /* Caching page for mode_sense */ + unsigned char ch_caching_pg[] = {/* 0x8, 18, */ 0x4, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; + unsigned char d_caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0, + 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, 0, 0, 0, 0}; + + if (SDEBUG_OPT_N_WCE & sdebug_opts) + caching_pg[2] &= ~0x4; /* set WCE=0 (default WCE=1) */ + memcpy(p, caching_pg, sizeof(caching_pg)); + if (1 == pcontrol) + memcpy(p + 2, ch_caching_pg, sizeof(ch_caching_pg)); + else if (2 == pcontrol) + memcpy(p, d_caching_pg, sizeof(d_caching_pg)); + return sizeof(caching_pg); +} + +static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, + 0, 0, 0x2, 0x4b}; + +static int resp_ctrl_m_pg(unsigned char *p, int pcontrol, int target) +{ /* Control mode page for mode_sense */ + unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0, + 0, 0, 0, 0}; + unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0, + 0, 0, 0x2, 0x4b}; + + if (sdebug_dsense) + ctrl_m_pg[2] |= 0x4; + else + ctrl_m_pg[2] &= ~0x4; + + if (sdebug_ato) + ctrl_m_pg[5] |= 0x80; /* ATO=1 */ + + memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg)); + if (1 == pcontrol) + memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg)); + else if (2 == pcontrol) + memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg)); + return sizeof(ctrl_m_pg); +} + + +static int resp_iec_m_pg(unsigned char *p, int pcontrol, int target) +{ /* Informational Exceptions control mode page for mode_sense */ + unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0, + 0, 0, 0x0, 0x0}; + unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0, + 0, 0, 0x0, 0x0}; + + memcpy(p, iec_m_pg, sizeof(iec_m_pg)); + if (1 == pcontrol) + memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg)); + else if (2 == pcontrol) + memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg)); + return sizeof(iec_m_pg); +} + +static int resp_sas_sf_m_pg(unsigned char *p, int pcontrol, int target) +{ /* SAS SSP mode page - short format for mode_sense */ + unsigned char sas_sf_m_pg[] = {0x19, 0x6, + 0x6, 0x0, 0x7, 0xd0, 0x0, 0x0}; + + memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg)); + if (1 == pcontrol) + memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2); + return sizeof(sas_sf_m_pg); +} + + +static int resp_sas_pcd_m_spg(unsigned char *p, int pcontrol, int target, + int target_dev_id) +{ /* SAS phy control and discover mode page for mode_sense */ + unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2, + 0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0, + 0, 0, 0, 0, 0, 0, 0, 0, /* insert SAS addr */ + 0, 0, 0, 0, 0, 0, 0, 0, /* insert SAS addr */ + 0x2, 0, 0, 0, 0, 0, 0, 0, + 0x88, 0x99, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + 0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0, + 0, 0, 0, 0, 0, 0, 0, 0, /* insert SAS addr */ + 0, 0, 0, 0, 0, 0, 0, 0, /* insert SAS addr */ + 0x3, 0, 0, 0, 0, 0, 0, 0, + 0x88, 0x99, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }; + int port_a, port_b; + + put_unaligned_be64(naa3_comp_a, sas_pcd_m_pg + 16); + put_unaligned_be64(naa3_comp_c + 1, sas_pcd_m_pg + 24); + put_unaligned_be64(naa3_comp_a, sas_pcd_m_pg + 64); + put_unaligned_be64(naa3_comp_c + 1, sas_pcd_m_pg + 72); + port_a = target_dev_id + 1; + port_b = port_a + 1; + memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg)); + put_unaligned_be32(port_a, p + 20); + put_unaligned_be32(port_b, p + 48 + 20); + if (1 == pcontrol) + memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4); + return sizeof(sas_pcd_m_pg); +} + +static int resp_sas_sha_m_spg(unsigned char *p, int pcontrol) +{ /* SAS SSP shared protocol specific port mode subpage */ + unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0, + 0, 0, 0, 0, 0, 0, 0, 0, + }; + + memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg)); + if (1 == pcontrol) + memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4); + return sizeof(sas_sha_m_pg); +} + +#define SDEBUG_MAX_MSENSE_SZ 256 + +static int resp_mode_sense(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + int pcontrol, pcode, subpcode, bd_len; + unsigned char dev_spec; + int alloc_len, offset, len, target_dev_id; + int target = scp->device->id; + unsigned char *ap; + unsigned char arr[SDEBUG_MAX_MSENSE_SZ]; + unsigned char *cmd = scp->cmnd; + bool dbd, llbaa, msense_6, is_disk, bad_pcode; + + dbd = !!(cmd[1] & 0x8); /* disable block descriptors */ + pcontrol = (cmd[2] & 0xc0) >> 6; + pcode = cmd[2] & 0x3f; + subpcode = cmd[3]; + msense_6 = (MODE_SENSE == cmd[0]); + llbaa = msense_6 ? false : !!(cmd[1] & 0x10); + is_disk = (sdebug_ptype == TYPE_DISK); + if (is_disk && !dbd) + bd_len = llbaa ? 16 : 8; + else + bd_len = 0; + alloc_len = msense_6 ? cmd[4] : get_unaligned_be16(cmd + 7); + memset(arr, 0, SDEBUG_MAX_MSENSE_SZ); + if (0x3 == pcontrol) { /* Saving values not supported */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 0); + return check_condition_result; + } + target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) + + (devip->target * 1000) - 3; + /* for disks set DPOFUA bit and clear write protect (WP) bit */ + if (is_disk) + dev_spec = 0x10; /* =0x90 if WP=1 implies read-only */ + else + dev_spec = 0x0; + if (msense_6) { + arr[2] = dev_spec; + arr[3] = bd_len; + offset = 4; + } else { + arr[3] = dev_spec; + if (16 == bd_len) + arr[4] = 0x1; /* set LONGLBA bit */ + arr[7] = bd_len; /* assume 255 or less */ + offset = 8; + } + ap = arr + offset; + if ((bd_len > 0) && (!sdebug_capacity)) + sdebug_capacity = get_sdebug_capacity(); + + if (8 == bd_len) { + if (sdebug_capacity > 0xfffffffe) + put_unaligned_be32(0xffffffff, ap + 0); + else + put_unaligned_be32(sdebug_capacity, ap + 0); + put_unaligned_be16(sdebug_sector_size, ap + 6); + offset += bd_len; + ap = arr + offset; + } else if (16 == bd_len) { + put_unaligned_be64((u64)sdebug_capacity, ap + 0); + put_unaligned_be32(sdebug_sector_size, ap + 12); + offset += bd_len; + ap = arr + offset; + } + + if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) { + /* TODO: Control Extension page */ + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + bad_pcode = false; + + switch (pcode) { + case 0x1: /* Read-Write error recovery page, direct access */ + len = resp_err_recov_pg(ap, pcontrol, target); + offset += len; + break; + case 0x2: /* Disconnect-Reconnect page, all devices */ + len = resp_disconnect_pg(ap, pcontrol, target); + offset += len; + break; + case 0x3: /* Format device page, direct access */ + if (is_disk) { + len = resp_format_pg(ap, pcontrol, target); + offset += len; + } else + bad_pcode = true; + break; + case 0x8: /* Caching page, direct access */ + if (is_disk) { + len = resp_caching_pg(ap, pcontrol, target); + offset += len; + } else + bad_pcode = true; + break; + case 0xa: /* Control Mode page, all devices */ + len = resp_ctrl_m_pg(ap, pcontrol, target); + offset += len; + break; + case 0x19: /* if spc==1 then sas phy, control+discover */ + if ((subpcode > 0x2) && (subpcode < 0xff)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + len = 0; + if ((0x0 == subpcode) || (0xff == subpcode)) + len += resp_sas_sf_m_pg(ap + len, pcontrol, target); + if ((0x1 == subpcode) || (0xff == subpcode)) + len += resp_sas_pcd_m_spg(ap + len, pcontrol, target, + target_dev_id); + if ((0x2 == subpcode) || (0xff == subpcode)) + len += resp_sas_sha_m_spg(ap + len, pcontrol); + offset += len; + break; + case 0x1c: /* Informational Exceptions Mode page, all devices */ + len = resp_iec_m_pg(ap, pcontrol, target); + offset += len; + break; + case 0x3f: /* Read all Mode pages */ + if ((0 == subpcode) || (0xff == subpcode)) { + len = resp_err_recov_pg(ap, pcontrol, target); + len += resp_disconnect_pg(ap + len, pcontrol, target); + if (is_disk) { + len += resp_format_pg(ap + len, pcontrol, + target); + len += resp_caching_pg(ap + len, pcontrol, + target); + } + len += resp_ctrl_m_pg(ap + len, pcontrol, target); + len += resp_sas_sf_m_pg(ap + len, pcontrol, target); + if (0xff == subpcode) { + len += resp_sas_pcd_m_spg(ap + len, pcontrol, + target, target_dev_id); + len += resp_sas_sha_m_spg(ap + len, pcontrol); + } + len += resp_iec_m_pg(ap + len, pcontrol, target); + offset += len; + } else { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + break; + default: + bad_pcode = true; + break; + } + if (bad_pcode) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5); + return check_condition_result; + } + if (msense_6) + arr[0] = offset - 1; + else + put_unaligned_be16((offset - 2), arr + 0); + return fill_from_dev_buffer(scp, arr, min(alloc_len, offset)); +} + +#define SDEBUG_MAX_MSELECT_SZ 512 + +static int resp_mode_select(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + int pf, sp, ps, md_len, bd_len, off, spf, pg_len; + int param_len, res, mpage; + unsigned char arr[SDEBUG_MAX_MSELECT_SZ]; + unsigned char *cmd = scp->cmnd; + int mselect6 = (MODE_SELECT == cmd[0]); + + memset(arr, 0, sizeof(arr)); + pf = cmd[1] & 0x10; + sp = cmd[1] & 0x1; + param_len = mselect6 ? cmd[4] : get_unaligned_be16(cmd + 7); + if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, mselect6 ? 4 : 7, -1); + return check_condition_result; + } + res = fetch_to_dev_buffer(scp, arr, param_len); + if (-1 == res) + return DID_ERROR << 16; + else if (sdebug_verbose && (res < param_len)) + sdev_printk(KERN_INFO, scp->device, + "%s: cdb indicated=%d, IO sent=%d bytes\n", + __func__, param_len, res); + md_len = mselect6 ? (arr[0] + 1) : (get_unaligned_be16(arr + 0) + 2); + bd_len = mselect6 ? arr[3] : get_unaligned_be16(arr + 6); + off = bd_len + (mselect6 ? 4 : 8); + if (md_len > 2 || off >= res) { + mk_sense_invalid_fld(scp, SDEB_IN_DATA, 0, -1); + return check_condition_result; + } + mpage = arr[off] & 0x3f; + ps = !!(arr[off] & 0x80); + if (ps) { + mk_sense_invalid_fld(scp, SDEB_IN_DATA, off, 7); + return check_condition_result; + } + spf = !!(arr[off] & 0x40); + pg_len = spf ? (get_unaligned_be16(arr + off + 2) + 4) : + (arr[off + 1] + 2); + if ((pg_len + off) > param_len) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, + PARAMETER_LIST_LENGTH_ERR, 0); + return check_condition_result; + } + switch (mpage) { + case 0x8: /* Caching Mode page */ + if (caching_pg[1] == arr[off + 1]) { + memcpy(caching_pg + 2, arr + off + 2, + sizeof(caching_pg) - 2); + goto set_mode_changed_ua; + } + break; + case 0xa: /* Control Mode page */ + if (ctrl_m_pg[1] == arr[off + 1]) { + memcpy(ctrl_m_pg + 2, arr + off + 2, + sizeof(ctrl_m_pg) - 2); + sdebug_dsense = !!(ctrl_m_pg[2] & 0x4); + goto set_mode_changed_ua; + } + break; + case 0x1c: /* Informational Exceptions Mode page */ + if (iec_m_pg[1] == arr[off + 1]) { + memcpy(iec_m_pg + 2, arr + off + 2, + sizeof(iec_m_pg) - 2); + goto set_mode_changed_ua; + } + break; + default: + break; + } + mk_sense_invalid_fld(scp, SDEB_IN_DATA, off, 5); + return check_condition_result; +set_mode_changed_ua: + set_bit(SDEBUG_UA_MODE_CHANGED, devip->uas_bm); + return 0; +} + +static int resp_temp_l_pg(unsigned char *arr) +{ + unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38, + 0x0, 0x1, 0x3, 0x2, 0x0, 65, + }; + + memcpy(arr, temp_l_pg, sizeof(temp_l_pg)); + return sizeof(temp_l_pg); +} + +static int resp_ie_l_pg(unsigned char *arr) +{ + unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38, + }; + + memcpy(arr, ie_l_pg, sizeof(ie_l_pg)); + if (iec_m_pg[2] & 0x4) { /* TEST bit set */ + arr[4] = THRESHOLD_EXCEEDED; + arr[5] = 0xff; + } + return sizeof(ie_l_pg); +} + +#define SDEBUG_MAX_LSENSE_SZ 512 + +static int resp_log_sense(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + int ppc, sp, pcode, subpcode, alloc_len, len, n; + unsigned char arr[SDEBUG_MAX_LSENSE_SZ]; + unsigned char *cmd = scp->cmnd; + + memset(arr, 0, sizeof(arr)); + ppc = cmd[1] & 0x2; + sp = cmd[1] & 0x1; + if (ppc || sp) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, ppc ? 1 : 0); + return check_condition_result; + } + pcode = cmd[2] & 0x3f; + subpcode = cmd[3] & 0xff; + alloc_len = get_unaligned_be16(cmd + 7); + arr[0] = pcode; + if (0 == subpcode) { + switch (pcode) { + case 0x0: /* Supported log pages log page */ + n = 4; + arr[n++] = 0x0; /* this page */ + arr[n++] = 0xd; /* Temperature */ + arr[n++] = 0x2f; /* Informational exceptions */ + arr[3] = n - 4; + break; + case 0xd: /* Temperature log page */ + arr[3] = resp_temp_l_pg(arr + 4); + break; + case 0x2f: /* Informational exceptions log page */ + arr[3] = resp_ie_l_pg(arr + 4); + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5); + return check_condition_result; + } + } else if (0xff == subpcode) { + arr[0] |= 0x40; + arr[1] = subpcode; + switch (pcode) { + case 0x0: /* Supported log pages and subpages log page */ + n = 4; + arr[n++] = 0x0; + arr[n++] = 0x0; /* 0,0 page */ + arr[n++] = 0x0; + arr[n++] = 0xff; /* this page */ + arr[n++] = 0xd; + arr[n++] = 0x0; /* Temperature */ + arr[n++] = 0x2f; + arr[n++] = 0x0; /* Informational exceptions */ + arr[3] = n - 4; + break; + case 0xd: /* Temperature subpages */ + n = 4; + arr[n++] = 0xd; + arr[n++] = 0x0; /* Temperature */ + arr[3] = n - 4; + break; + case 0x2f: /* Informational exceptions subpages */ + n = 4; + arr[n++] = 0x2f; + arr[n++] = 0x0; /* Informational exceptions */ + arr[3] = n - 4; + break; + default: + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5); + return check_condition_result; + } + } else { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1); + return check_condition_result; + } + len = min(get_unaligned_be16(arr + 2) + 4, alloc_len); + return fill_from_dev_buffer(scp, arr, + min(len, SDEBUG_MAX_INQ_ARR_SZ)); +} + +static int check_device_access_params(struct scsi_cmnd *scp, + unsigned long long lba, unsigned int num) +{ + if (lba + num > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (num > sdebug_store_sectors) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + return 0; +} + +/* Returns number of bytes copied or -1 if error. */ +static int do_device_access(struct scsi_cmnd *scmd, u32 sg_skip, u64 lba, + u32 num, bool do_write) +{ + int ret; + u64 block, rest = 0; + struct scsi_data_buffer *sdb; + enum dma_data_direction dir; + + if (do_write) { + sdb = scsi_out(scmd); + dir = DMA_TO_DEVICE; + write_since_sync = true; + } else { + sdb = scsi_in(scmd); + dir = DMA_FROM_DEVICE; + } + + if (!sdb->length) + return 0; + if (!(scsi_bidi_cmnd(scmd) || scmd->sc_data_direction == dir)) + return -1; + + block = do_div(lba, sdebug_store_sectors); + if (block + num > sdebug_store_sectors) + rest = block + num - sdebug_store_sectors; + + ret = sg_copy_buffer(sdb->table.sgl, sdb->table.nents, + fake_storep + (block * sdebug_sector_size), + (num - rest) * sdebug_sector_size, sg_skip, do_write); + if (ret != (num - rest) * sdebug_sector_size) + return ret; + + if (rest) { + ret += sg_copy_buffer(sdb->table.sgl, sdb->table.nents, + fake_storep, rest * sdebug_sector_size, + sg_skip + ((num - rest) * sdebug_sector_size), + do_write); + } + + return ret; +} + +/* If lba2fake_store(lba,num) compares equal to arr(num), then copy top half of + * arr into lba2fake_store(lba,num) and return true. If comparison fails then + * return false. */ +static bool comp_write_worker(u64 lba, u32 num, const u8 *arr) +{ + bool res; + u64 block, rest = 0; + u32 store_blks = sdebug_store_sectors; + u32 lb_size = sdebug_sector_size; + + block = do_div(lba, store_blks); + if (block + num > store_blks) + rest = block + num - store_blks; + + res = !memcmp(fake_storep + (block * lb_size), arr, + (num - rest) * lb_size); + if (!res) + return res; + if (rest) + res = memcmp(fake_storep, arr + ((num - rest) * lb_size), + rest * lb_size); + if (!res) + return res; + arr += num * lb_size; + memcpy(fake_storep + (block * lb_size), arr, (num - rest) * lb_size); + if (rest) + memcpy(fake_storep, arr + ((num - rest) * lb_size), + rest * lb_size); + return res; +} + +static __be16 dif_compute_csum(const void *buf, int len) +{ + __be16 csum; + + if (sdebug_guard) + csum = (__force __be16)ip_compute_csum(buf, len); + else + csum = cpu_to_be16(crc_t10dif(buf, len)); + + return csum; +} + +static int dif_verify(struct t10_pi_tuple *sdt, const void *data, + sector_t sector, u32 ei_lba) +{ + __be16 csum = dif_compute_csum(data, sdebug_sector_size); + + if (sdt->guard_tag != csum) { + pr_err("GUARD check failed on sector %lu rcvd 0x%04x, data 0x%04x\n", + (unsigned long)sector, + be16_to_cpu(sdt->guard_tag), + be16_to_cpu(csum)); + return 0x01; + } + if (sdebug_dif == T10_PI_TYPE1_PROTECTION && + be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) { + pr_err("REF check failed on sector %lu\n", + (unsigned long)sector); + return 0x03; + } + if (sdebug_dif == T10_PI_TYPE2_PROTECTION && + be32_to_cpu(sdt->ref_tag) != ei_lba) { + pr_err("REF check failed on sector %lu\n", + (unsigned long)sector); + return 0x03; + } + return 0; +} + +static void dif_copy_prot(struct scsi_cmnd *SCpnt, sector_t sector, + unsigned int sectors, bool read) +{ + size_t resid; + void *paddr; + const void *dif_store_end = dif_storep + sdebug_store_sectors; + struct sg_mapping_iter miter; + + /* Bytes of protection data to copy into sgl */ + resid = sectors * sizeof(*dif_storep); + + sg_miter_start(&miter, scsi_prot_sglist(SCpnt), + scsi_prot_sg_count(SCpnt), SG_MITER_ATOMIC | + (read ? SG_MITER_TO_SG : SG_MITER_FROM_SG)); + + while (sg_miter_next(&miter) && resid > 0) { + size_t len = min(miter.length, resid); + void *start = dif_store(sector); + size_t rest = 0; + + if (dif_store_end < start + len) + rest = start + len - dif_store_end; + + paddr = miter.addr; + + if (read) + memcpy(paddr, start, len - rest); + else + memcpy(start, paddr, len - rest); + + if (rest) { + if (read) + memcpy(paddr + len - rest, dif_storep, rest); + else + memcpy(dif_storep, paddr + len - rest, rest); + } + + sector += len / sizeof(*dif_storep); + resid -= len; + } + sg_miter_stop(&miter); +} + +static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec, + unsigned int sectors, u32 ei_lba) +{ + unsigned int i; + struct t10_pi_tuple *sdt; + sector_t sector; + + for (i = 0; i < sectors; i++, ei_lba++) { + int ret; + + sector = start_sec + i; + sdt = dif_store(sector); + + if (sdt->app_tag == cpu_to_be16(0xffff)) + continue; + + ret = dif_verify(sdt, lba2fake_store(sector), sector, ei_lba); + if (ret) { + dif_errors++; + return ret; + } + } + + dif_copy_prot(SCpnt, start_sec, sectors, true); + dix_reads++; + + return 0; +} + +static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + struct sdebug_queued_cmd *sqcp; + u64 lba; + u32 num; + u32 ei_lba; + unsigned long iflags; + int ret; + bool check_prot; + + switch (cmd[0]) { + case READ_16: + ei_lba = 0; + lba = get_unaligned_be64(cmd + 2); + num = get_unaligned_be32(cmd + 10); + check_prot = true; + break; + case READ_10: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = true; + break; + case READ_6: + ei_lba = 0; + lba = (u32)cmd[3] | (u32)cmd[2] << 8 | + (u32)(cmd[1] & 0x1f) << 16; + num = (0 == cmd[4]) ? 256 : cmd[4]; + check_prot = true; + break; + case READ_12: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be32(cmd + 6); + check_prot = true; + break; + case XDWRITEREAD_10: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = false; + break; + default: /* assume READ(32) */ + lba = get_unaligned_be64(cmd + 12); + ei_lba = get_unaligned_be32(cmd + 20); + num = get_unaligned_be32(cmd + 28); + check_prot = false; + break; + } + if (unlikely(have_dif_prot && check_prot)) { + if (sdebug_dif == T10_PI_TYPE2_PROTECTION && + (cmd[1] & 0xe0)) { + mk_sense_invalid_opcode(scp); + return check_condition_result; + } + if ((sdebug_dif == T10_PI_TYPE1_PROTECTION || + sdebug_dif == T10_PI_TYPE3_PROTECTION) && + (cmd[1] & 0xe0) == 0) + sdev_printk(KERN_ERR, scp->device, "Unprotected RD " + "to DIF device\n"); + } + if (unlikely(sdebug_any_injecting_opt)) { + sqcp = (struct sdebug_queued_cmd *)scp->host_scribble; + + if (sqcp) { + if (sqcp->inj_short) + num /= 2; + } + } else + sqcp = NULL; + + /* inline check_device_access_params() */ + if (unlikely(lba + num > sdebug_capacity)) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (unlikely(num > sdebug_store_sectors)) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + + if (unlikely((SDEBUG_OPT_MEDIUM_ERR & sdebug_opts) && + (lba <= (sdebug_medium_error_start + sdebug_medium_error_count - 1)) && + ((lba + num) > sdebug_medium_error_start))) { + /* claim unrecoverable read error */ + mk_sense_buffer(scp, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0); + /* set info field and valid bit for fixed descriptor */ + if (0x70 == (scp->sense_buffer[0] & 0x7f)) { + scp->sense_buffer[0] |= 0x80; /* Valid bit */ + ret = (lba < OPT_MEDIUM_ERR_ADDR) + ? OPT_MEDIUM_ERR_ADDR : (int)lba; + put_unaligned_be32(ret, scp->sense_buffer + 3); + } + scsi_set_resid(scp, scsi_bufflen(scp)); + return check_condition_result; + } + + read_lock_irqsave(&atomic_rw, iflags); + + /* DIX + T10 DIF */ + if (unlikely(sdebug_dix && scsi_prot_sg_count(scp))) { + int prot_ret = prot_verify_read(scp, lba, num, ei_lba); + + if (prot_ret) { + read_unlock_irqrestore(&atomic_rw, iflags); + mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, prot_ret); + return illegal_condition_result; + } + } + + ret = do_device_access(scp, 0, lba, num, false); + read_unlock_irqrestore(&atomic_rw, iflags); + if (unlikely(ret == -1)) + return DID_ERROR << 16; + + scsi_in(scp)->resid = scsi_bufflen(scp) - ret; + + if (unlikely(sqcp)) { + if (sqcp->inj_recovered) { + mk_sense_buffer(scp, RECOVERED_ERROR, + THRESHOLD_EXCEEDED, 0); + return check_condition_result; + } else if (sqcp->inj_transport) { + mk_sense_buffer(scp, ABORTED_COMMAND, + TRANSPORT_PROBLEM, ACK_NAK_TO); + return check_condition_result; + } else if (sqcp->inj_dif) { + /* Logical block guard check failed */ + mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, 1); + return illegal_condition_result; + } else if (sqcp->inj_dix) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, 1); + return illegal_condition_result; + } + } + return 0; +} + +static void dump_sector(unsigned char *buf, int len) +{ + int i, j, n; + + pr_err(">>> Sector Dump <<<\n"); + for (i = 0 ; i < len ; i += 16) { + char b[128]; + + for (j = 0, n = 0; j < 16; j++) { + unsigned char c = buf[i+j]; + + if (c >= 0x20 && c < 0x7e) + n += scnprintf(b + n, sizeof(b) - n, + " %c ", buf[i+j]); + else + n += scnprintf(b + n, sizeof(b) - n, + "%02x ", buf[i+j]); + } + pr_err("%04d: %s\n", i, b); + } +} + +static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec, + unsigned int sectors, u32 ei_lba) +{ + int ret; + struct t10_pi_tuple *sdt; + void *daddr; + sector_t sector = start_sec; + int ppage_offset; + int dpage_offset; + struct sg_mapping_iter diter; + struct sg_mapping_iter piter; + + BUG_ON(scsi_sg_count(SCpnt) == 0); + BUG_ON(scsi_prot_sg_count(SCpnt) == 0); + + sg_miter_start(&piter, scsi_prot_sglist(SCpnt), + scsi_prot_sg_count(SCpnt), + SG_MITER_ATOMIC | SG_MITER_FROM_SG); + sg_miter_start(&diter, scsi_sglist(SCpnt), scsi_sg_count(SCpnt), + SG_MITER_ATOMIC | SG_MITER_FROM_SG); + + /* For each protection page */ + while (sg_miter_next(&piter)) { + dpage_offset = 0; + if (WARN_ON(!sg_miter_next(&diter))) { + ret = 0x01; + goto out; + } + + for (ppage_offset = 0; ppage_offset < piter.length; + ppage_offset += sizeof(struct t10_pi_tuple)) { + /* If we're at the end of the current + * data page advance to the next one + */ + if (dpage_offset >= diter.length) { + if (WARN_ON(!sg_miter_next(&diter))) { + ret = 0x01; + goto out; + } + dpage_offset = 0; + } + + sdt = piter.addr + ppage_offset; + daddr = diter.addr + dpage_offset; + + ret = dif_verify(sdt, daddr, sector, ei_lba); + if (ret) { + dump_sector(daddr, sdebug_sector_size); + goto out; + } + + sector++; + ei_lba++; + dpage_offset += sdebug_sector_size; + } + diter.consumed = dpage_offset; + sg_miter_stop(&diter); + } + sg_miter_stop(&piter); + + dif_copy_prot(SCpnt, start_sec, sectors, false); + dix_writes++; + + return 0; + +out: + dif_errors++; + sg_miter_stop(&diter); + sg_miter_stop(&piter); + return ret; +} + +static unsigned long lba_to_map_index(sector_t lba) +{ + if (sdebug_unmap_alignment) + lba += sdebug_unmap_granularity - sdebug_unmap_alignment; + sector_div(lba, sdebug_unmap_granularity); + return lba; +} + +static sector_t map_index_to_lba(unsigned long index) +{ + sector_t lba = index * sdebug_unmap_granularity; + + if (sdebug_unmap_alignment) + lba -= sdebug_unmap_granularity - sdebug_unmap_alignment; + return lba; +} + +static unsigned int map_state(sector_t lba, unsigned int *num) +{ + sector_t end; + unsigned int mapped; + unsigned long index; + unsigned long next; + + index = lba_to_map_index(lba); + mapped = test_bit(index, map_storep); + + if (mapped) + next = find_next_zero_bit(map_storep, map_size, index); + else + next = find_next_bit(map_storep, map_size, index); + + end = min_t(sector_t, sdebug_store_sectors, map_index_to_lba(next)); + *num = end - lba; + return mapped; +} + +static void map_region(sector_t lba, unsigned int len) +{ + sector_t end = lba + len; + + while (lba < end) { + unsigned long index = lba_to_map_index(lba); + + if (index < map_size) + set_bit(index, map_storep); + + lba = map_index_to_lba(index + 1); + } +} + +static void unmap_region(sector_t lba, unsigned int len) +{ + sector_t end = lba + len; + + while (lba < end) { + unsigned long index = lba_to_map_index(lba); + + if (lba == map_index_to_lba(index) && + lba + sdebug_unmap_granularity <= end && + index < map_size) { + clear_bit(index, map_storep); + if (sdebug_lbprz) { /* for LBPRZ=2 return 0xff_s */ + memset(fake_storep + + lba * sdebug_sector_size, + (sdebug_lbprz & 1) ? 0 : 0xff, + sdebug_sector_size * + sdebug_unmap_granularity); + } + if (dif_storep) { + memset(dif_storep + lba, 0xff, + sizeof(*dif_storep) * + sdebug_unmap_granularity); + } + } + lba = map_index_to_lba(index + 1); + } +} + +static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + u32 ei_lba; + unsigned long iflags; + int ret; + bool check_prot; + + switch (cmd[0]) { + case WRITE_16: + ei_lba = 0; + lba = get_unaligned_be64(cmd + 2); + num = get_unaligned_be32(cmd + 10); + check_prot = true; + break; + case WRITE_10: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = true; + break; + case WRITE_6: + ei_lba = 0; + lba = (u32)cmd[3] | (u32)cmd[2] << 8 | + (u32)(cmd[1] & 0x1f) << 16; + num = (0 == cmd[4]) ? 256 : cmd[4]; + check_prot = true; + break; + case WRITE_12: + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be32(cmd + 6); + check_prot = true; + break; + case 0x53: /* XDWRITEREAD(10) */ + ei_lba = 0; + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + check_prot = false; + break; + default: /* assume WRITE(32) */ + lba = get_unaligned_be64(cmd + 12); + ei_lba = get_unaligned_be32(cmd + 20); + num = get_unaligned_be32(cmd + 28); + check_prot = false; + break; + } + if (unlikely(have_dif_prot && check_prot)) { + if (sdebug_dif == T10_PI_TYPE2_PROTECTION && + (cmd[1] & 0xe0)) { + mk_sense_invalid_opcode(scp); + return check_condition_result; + } + if ((sdebug_dif == T10_PI_TYPE1_PROTECTION || + sdebug_dif == T10_PI_TYPE3_PROTECTION) && + (cmd[1] & 0xe0) == 0) + sdev_printk(KERN_ERR, scp->device, "Unprotected WR " + "to DIF device\n"); + } + + /* inline check_device_access_params() */ + if (unlikely(lba + num > sdebug_capacity)) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (unlikely(num > sdebug_store_sectors)) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + + write_lock_irqsave(&atomic_rw, iflags); + + /* DIX + T10 DIF */ + if (unlikely(sdebug_dix && scsi_prot_sg_count(scp))) { + int prot_ret = prot_verify_write(scp, lba, num, ei_lba); + + if (prot_ret) { + write_unlock_irqrestore(&atomic_rw, iflags); + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, prot_ret); + return illegal_condition_result; + } + } + + ret = do_device_access(scp, 0, lba, num, true); + if (unlikely(scsi_debug_lbp())) + map_region(lba, num); + write_unlock_irqrestore(&atomic_rw, iflags); + if (unlikely(-1 == ret)) + return DID_ERROR << 16; + else if (unlikely(sdebug_verbose && + (ret < (num * sdebug_sector_size)))) + sdev_printk(KERN_INFO, scp->device, + "%s: write: cdb indicated=%u, IO sent=%d bytes\n", + my_name, num * sdebug_sector_size, ret); + + if (unlikely(sdebug_any_injecting_opt)) { + struct sdebug_queued_cmd *sqcp = + (struct sdebug_queued_cmd *)scp->host_scribble; + + if (sqcp) { + if (sqcp->inj_recovered) { + mk_sense_buffer(scp, RECOVERED_ERROR, + THRESHOLD_EXCEEDED, 0); + return check_condition_result; + } else if (sqcp->inj_dif) { + /* Logical block guard check failed */ + mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, 1); + return illegal_condition_result; + } else if (sqcp->inj_dix) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, 1); + return illegal_condition_result; + } + } + } + return 0; +} + +/* + * T10 has only specified WRITE SCATTERED(16) and WRITE SCATTERED(32). + * No READ GATHERED yet (requires bidi or long cdb holding gather list). + */ +static int resp_write_scat(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u8 *lrdp = NULL; + u8 *up; + u8 wrprotect; + u16 lbdof, num_lrd, k; + u32 num, num_by, bt_len, lbdof_blen, sg_off, cum_lb; + u32 lb_size = sdebug_sector_size; + u32 ei_lba; + u64 lba; + unsigned long iflags; + int ret, res; + bool is_16; + static const u32 lrd_size = 32; /* + parameter list header size */ + + if (cmd[0] == VARIABLE_LENGTH_CMD) { + is_16 = false; + wrprotect = (cmd[10] >> 5) & 0x7; + lbdof = get_unaligned_be16(cmd + 12); + num_lrd = get_unaligned_be16(cmd + 16); + bt_len = get_unaligned_be32(cmd + 28); + } else { /* that leaves WRITE SCATTERED(16) */ + is_16 = true; + wrprotect = (cmd[2] >> 5) & 0x7; + lbdof = get_unaligned_be16(cmd + 4); + num_lrd = get_unaligned_be16(cmd + 8); + bt_len = get_unaligned_be32(cmd + 10); + if (unlikely(have_dif_prot)) { + if (sdebug_dif == T10_PI_TYPE2_PROTECTION && + wrprotect) { + mk_sense_invalid_opcode(scp); + return illegal_condition_result; + } + if ((sdebug_dif == T10_PI_TYPE1_PROTECTION || + sdebug_dif == T10_PI_TYPE3_PROTECTION) && + wrprotect == 0) + sdev_printk(KERN_ERR, scp->device, + "Unprotected WR to DIF device\n"); + } + } + if ((num_lrd == 0) || (bt_len == 0)) + return 0; /* T10 says these do-nothings are not errors */ + if (lbdof == 0) { + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: LB Data Offset field bad\n", + my_name, __func__); + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return illegal_condition_result; + } + lbdof_blen = lbdof * lb_size; + if ((lrd_size + (num_lrd * lrd_size)) > lbdof_blen) { + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: LBA range descriptors don't fit\n", + my_name, __func__); + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return illegal_condition_result; + } + lrdp = kzalloc(lbdof_blen, GFP_ATOMIC); + if (lrdp == NULL) + return SCSI_MLQUEUE_HOST_BUSY; + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: Fetch header+scatter_list, lbdof_blen=%u\n", + my_name, __func__, lbdof_blen); + res = fetch_to_dev_buffer(scp, lrdp, lbdof_blen); + if (res == -1) { + ret = DID_ERROR << 16; + goto err_out; + } + + write_lock_irqsave(&atomic_rw, iflags); + sg_off = lbdof_blen; + /* Spec says Buffer xfer Length field in number of LBs in dout */ + cum_lb = 0; + for (k = 0, up = lrdp + lrd_size; k < num_lrd; ++k, up += lrd_size) { + lba = get_unaligned_be64(up + 0); + num = get_unaligned_be32(up + 8); + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: k=%d LBA=0x%llx num=%u sg_off=%u\n", + my_name, __func__, k, lba, num, sg_off); + if (num == 0) + continue; + ret = check_device_access_params(scp, lba, num); + if (ret) + goto err_out_unlock; + num_by = num * lb_size; + ei_lba = is_16 ? 0 : get_unaligned_be32(up + 12); + + if ((cum_lb + num) > bt_len) { + if (sdebug_verbose) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: sum of blocks > data provided\n", + my_name, __func__); + mk_sense_buffer(scp, ILLEGAL_REQUEST, WRITE_ERROR_ASC, + 0); + ret = illegal_condition_result; + goto err_out_unlock; + } + + /* DIX + T10 DIF */ + if (unlikely(sdebug_dix && scsi_prot_sg_count(scp))) { + int prot_ret = prot_verify_write(scp, lba, num, + ei_lba); + + if (prot_ret) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, + prot_ret); + ret = illegal_condition_result; + goto err_out_unlock; + } + } + + ret = do_device_access(scp, sg_off, lba, num, true); + if (unlikely(scsi_debug_lbp())) + map_region(lba, num); + if (unlikely(-1 == ret)) { + ret = DID_ERROR << 16; + goto err_out_unlock; + } else if (unlikely(sdebug_verbose && (ret < num_by))) + sdev_printk(KERN_INFO, scp->device, + "%s: write: cdb indicated=%u, IO sent=%d bytes\n", + my_name, num_by, ret); + + if (unlikely(sdebug_any_injecting_opt)) { + struct sdebug_queued_cmd *sqcp = + (struct sdebug_queued_cmd *)scp->host_scribble; + + if (sqcp) { + if (sqcp->inj_recovered) { + mk_sense_buffer(scp, RECOVERED_ERROR, + THRESHOLD_EXCEEDED, 0); + ret = illegal_condition_result; + goto err_out_unlock; + } else if (sqcp->inj_dif) { + /* Logical block guard check failed */ + mk_sense_buffer(scp, ABORTED_COMMAND, + 0x10, 1); + ret = illegal_condition_result; + goto err_out_unlock; + } else if (sqcp->inj_dix) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, + 0x10, 1); + ret = illegal_condition_result; + goto err_out_unlock; + } + } + } + sg_off += num_by; + cum_lb += num; + } + ret = 0; +err_out_unlock: + write_unlock_irqrestore(&atomic_rw, iflags); +err_out: + kfree(lrdp); + return ret; +} + +static int resp_write_same(struct scsi_cmnd *scp, u64 lba, u32 num, + u32 ei_lba, bool unmap, bool ndob) +{ + int ret; + unsigned long iflags; + unsigned long long i; + u32 lb_size = sdebug_sector_size; + u64 block, lbaa; + u8 *fs1p; + + ret = check_device_access_params(scp, lba, num); + if (ret) + return ret; + + write_lock_irqsave(&atomic_rw, iflags); + + if (unmap && scsi_debug_lbp()) { + unmap_region(lba, num); + goto out; + } + lbaa = lba; + block = do_div(lbaa, sdebug_store_sectors); + /* if ndob then zero 1 logical block, else fetch 1 logical block */ + fs1p = fake_storep + (block * lb_size); + if (ndob) { + memset(fs1p, 0, lb_size); + ret = 0; + } else + ret = fetch_to_dev_buffer(scp, fs1p, lb_size); + + if (-1 == ret) { + write_unlock_irqrestore(&atomic_rw, iflags); + return DID_ERROR << 16; + } else if (sdebug_verbose && !ndob && (ret < lb_size)) + sdev_printk(KERN_INFO, scp->device, + "%s: %s: lb size=%u, IO sent=%d bytes\n", + my_name, "write same", lb_size, ret); + + /* Copy first sector to remaining blocks */ + for (i = 1 ; i < num ; i++) { + lbaa = lba + i; + block = do_div(lbaa, sdebug_store_sectors); + memmove(fake_storep + (block * lb_size), fs1p, lb_size); + } + if (scsi_debug_lbp()) + map_region(lba, num); +out: + write_unlock_irqrestore(&atomic_rw, iflags); + + return 0; +} + +static int resp_write_same_10(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u32 lba; + u16 num; + u32 ei_lba = 0; + bool unmap = false; + + if (cmd[1] & 0x8) { + if (sdebug_lbpws10 == 0) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 3); + return check_condition_result; + } else + unmap = true; + } + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + if (num > sdebug_write_same_length) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 7, -1); + return check_condition_result; + } + return resp_write_same(scp, lba, num, ei_lba, unmap, false); +} + +static int resp_write_same_16(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + u32 ei_lba = 0; + bool unmap = false; + bool ndob = false; + + if (cmd[1] & 0x8) { /* UNMAP */ + if (sdebug_lbpws == 0) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 3); + return check_condition_result; + } else + unmap = true; + } + if (cmd[1] & 0x1) /* NDOB (no data-out buffer, assumes zeroes) */ + ndob = true; + lba = get_unaligned_be64(cmd + 2); + num = get_unaligned_be32(cmd + 10); + if (num > sdebug_write_same_length) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 10, -1); + return check_condition_result; + } + return resp_write_same(scp, lba, num, ei_lba, unmap, ndob); +} + +/* Note the mode field is in the same position as the (lower) service action + * field. For the Report supported operation codes command, SPC-4 suggests + * each mode of this command should be reported separately; for future. */ +static int resp_write_buffer(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + struct scsi_device *sdp = scp->device; + struct sdebug_dev_info *dp; + u8 mode; + + mode = cmd[1] & 0x1f; + switch (mode) { + case 0x4: /* download microcode (MC) and activate (ACT) */ + /* set UAs on this device only */ + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + set_bit(SDEBUG_UA_MICROCODE_CHANGED, devip->uas_bm); + break; + case 0x5: /* download MC, save and ACT */ + set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET, devip->uas_bm); + break; + case 0x6: /* download MC with offsets and ACT */ + /* set UAs on most devices (LUs) in this target */ + list_for_each_entry(dp, + &devip->sdbg_host->dev_info_list, + dev_list) + if (dp->target == sdp->id) { + set_bit(SDEBUG_UA_BUS_RESET, dp->uas_bm); + if (devip != dp) + set_bit(SDEBUG_UA_MICROCODE_CHANGED, + dp->uas_bm); + } + break; + case 0x7: /* download MC with offsets, save, and ACT */ + /* set UA on all devices (LUs) in this target */ + list_for_each_entry(dp, + &devip->sdbg_host->dev_info_list, + dev_list) + if (dp->target == sdp->id) + set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET, + dp->uas_bm); + break; + default: + /* do nothing for this command for other mode values */ + break; + } + return 0; +} + +static int resp_comp_write(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u8 *arr; + u8 *fake_storep_hold; + u64 lba; + u32 dnum; + u32 lb_size = sdebug_sector_size; + u8 num; + unsigned long iflags; + int ret; + int retval = 0; + + lba = get_unaligned_be64(cmd + 2); + num = cmd[13]; /* 1 to a maximum of 255 logical blocks */ + if (0 == num) + return 0; /* degenerate case, not an error */ + if (sdebug_dif == T10_PI_TYPE2_PROTECTION && + (cmd[1] & 0xe0)) { + mk_sense_invalid_opcode(scp); + return check_condition_result; + } + if ((sdebug_dif == T10_PI_TYPE1_PROTECTION || + sdebug_dif == T10_PI_TYPE3_PROTECTION) && + (cmd[1] & 0xe0) == 0) + sdev_printk(KERN_ERR, scp->device, "Unprotected WR " + "to DIF device\n"); + + /* inline check_device_access_params() */ + if (lba + num > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + /* transfer length excessive (tie in to block limits VPD page) */ + if (num > sdebug_store_sectors) { + /* needs work to find which cdb byte 'num' comes from */ + mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0); + return check_condition_result; + } + dnum = 2 * num; + arr = kcalloc(lb_size, dnum, GFP_ATOMIC); + if (NULL == arr) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + + write_lock_irqsave(&atomic_rw, iflags); + + /* trick do_device_access() to fetch both compare and write buffers + * from data-in into arr. Safe (atomic) since write_lock held. */ + fake_storep_hold = fake_storep; + fake_storep = arr; + ret = do_device_access(scp, 0, 0, dnum, true); + fake_storep = fake_storep_hold; + if (ret == -1) { + retval = DID_ERROR << 16; + goto cleanup; + } else if (sdebug_verbose && (ret < (dnum * lb_size))) + sdev_printk(KERN_INFO, scp->device, "%s: compare_write: cdb " + "indicated=%u, IO sent=%d bytes\n", my_name, + dnum * lb_size, ret); + if (!comp_write_worker(lba, num, arr)) { + mk_sense_buffer(scp, MISCOMPARE, MISCOMPARE_VERIFY_ASC, 0); + retval = check_condition_result; + goto cleanup; + } + if (scsi_debug_lbp()) + map_region(lba, num); +cleanup: + write_unlock_irqrestore(&atomic_rw, iflags); + kfree(arr); + return retval; +} + +struct unmap_block_desc { + __be64 lba; + __be32 blocks; + __be32 __reserved; +}; + +static int resp_unmap(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) +{ + unsigned char *buf; + struct unmap_block_desc *desc; + unsigned int i, payload_len, descriptors; + int ret; + unsigned long iflags; + + + if (!scsi_debug_lbp()) + return 0; /* fib and say its done */ + payload_len = get_unaligned_be16(scp->cmnd + 7); + BUG_ON(scsi_bufflen(scp) != payload_len); + + descriptors = (payload_len - 8) / 16; + if (descriptors > sdebug_unmap_max_desc) { + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 7, -1); + return check_condition_result; + } + + buf = kzalloc(scsi_bufflen(scp), GFP_ATOMIC); + if (!buf) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + + scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp)); + + BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2); + BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16); + + desc = (void *)&buf[8]; + + write_lock_irqsave(&atomic_rw, iflags); + + for (i = 0 ; i < descriptors ; i++) { + unsigned long long lba = get_unaligned_be64(&desc[i].lba); + unsigned int num = get_unaligned_be32(&desc[i].blocks); + + ret = check_device_access_params(scp, lba, num); + if (ret) + goto out; + + unmap_region(lba, num); + } + + ret = 0; + +out: + write_unlock_irqrestore(&atomic_rw, iflags); + kfree(buf); + + return ret; +} + +#define SDEBUG_GET_LBA_STATUS_LEN 32 + +static int resp_get_lba_status(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 alloc_len, mapped, num; + u8 arr[SDEBUG_GET_LBA_STATUS_LEN]; + int ret; + + lba = get_unaligned_be64(cmd + 2); + alloc_len = get_unaligned_be32(cmd + 10); + + if (alloc_len < 24) + return 0; + + ret = check_device_access_params(scp, lba, 1); + if (ret) + return ret; + + if (scsi_debug_lbp()) + mapped = map_state(lba, &num); + else { + mapped = 1; + /* following just in case virtual_gb changed */ + sdebug_capacity = get_sdebug_capacity(); + if (sdebug_capacity - lba <= 0xffffffff) + num = sdebug_capacity - lba; + else + num = 0xffffffff; + } + + memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN); + put_unaligned_be32(20, arr); /* Parameter Data Length */ + put_unaligned_be64(lba, arr + 8); /* LBA */ + put_unaligned_be32(num, arr + 16); /* Number of blocks */ + arr[20] = !mapped; /* prov_stat=0: mapped; 1: dealloc */ + + return fill_from_dev_buffer(scp, arr, SDEBUG_GET_LBA_STATUS_LEN); +} + +static int resp_sync_cache(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + int res = 0; + u64 lba; + u32 num_blocks; + u8 *cmd = scp->cmnd; + + if (cmd[0] == SYNCHRONIZE_CACHE) { /* 10 byte cdb */ + lba = get_unaligned_be32(cmd + 2); + num_blocks = get_unaligned_be16(cmd + 7); + } else { /* SYNCHRONIZE_CACHE(16) */ + lba = get_unaligned_be64(cmd + 2); + num_blocks = get_unaligned_be32(cmd + 10); + } + if (lba + num_blocks > sdebug_capacity) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0); + return check_condition_result; + } + if (!write_since_sync || cmd[1] & 0x2) + res = SDEG_RES_IMMED_MASK; + else /* delay if write_since_sync and IMMED clear */ + write_since_sync = false; + return res; +} + +#define RL_BUCKET_ELEMS 8 + +/* Even though each pseudo target has a REPORT LUNS "well known logical unit" + * (W-LUN), the normal Linux scanning logic does not associate it with a + * device (e.g. /dev/sg7). The following magic will make that association: + * "cd /sys/class/scsi_host/host<n> ; echo '- - 49409' > scan" + * where <n> is a host number. If there are multiple targets in a host then + * the above will associate a W-LUN to each target. To only get a W-LUN + * for target 2, then use "echo '- 2 49409' > scan" . + */ +static int resp_report_luns(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + unsigned char *cmd = scp->cmnd; + unsigned int alloc_len; + unsigned char select_report; + u64 lun; + struct scsi_lun *lun_p; + u8 arr[RL_BUCKET_ELEMS * sizeof(struct scsi_lun)]; + unsigned int lun_cnt; /* normal LUN count (max: 256) */ + unsigned int wlun_cnt; /* report luns W-LUN count */ + unsigned int tlun_cnt; /* total LUN count */ + unsigned int rlen; /* response length (in bytes) */ + int k, j, n, res; + unsigned int off_rsp = 0; + const int sz_lun = sizeof(struct scsi_lun); + + clear_luns_changed_on_target(devip); + + select_report = cmd[2]; + alloc_len = get_unaligned_be32(cmd + 6); + + if (alloc_len < 4) { + pr_err("alloc len too small %d\n", alloc_len); + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1); + return check_condition_result; + } + + switch (select_report) { + case 0: /* all LUNs apart from W-LUNs */ + lun_cnt = sdebug_max_luns; + wlun_cnt = 0; + break; + case 1: /* only W-LUNs */ + lun_cnt = 0; + wlun_cnt = 1; + break; + case 2: /* all LUNs */ + lun_cnt = sdebug_max_luns; + wlun_cnt = 1; + break; + case 0x10: /* only administrative LUs */ + case 0x11: /* see SPC-5 */ + case 0x12: /* only subsiduary LUs owned by referenced LU */ + default: + pr_debug("select report invalid %d\n", select_report); + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1); + return check_condition_result; + } + + if (sdebug_no_lun_0 && (lun_cnt > 0)) + --lun_cnt; + + tlun_cnt = lun_cnt + wlun_cnt; + rlen = tlun_cnt * sz_lun; /* excluding 8 byte header */ + scsi_set_resid(scp, scsi_bufflen(scp)); + pr_debug("select_report %d luns = %d wluns = %d no_lun0 %d\n", + select_report, lun_cnt, wlun_cnt, sdebug_no_lun_0); + + /* loops rely on sizeof response header same as sizeof lun (both 8) */ + lun = sdebug_no_lun_0 ? 1 : 0; + for (k = 0, j = 0, res = 0; true; ++k, j = 0) { + memset(arr, 0, sizeof(arr)); + lun_p = (struct scsi_lun *)&arr[0]; + if (k == 0) { + put_unaligned_be32(rlen, &arr[0]); + ++lun_p; + j = 1; + } + for ( ; j < RL_BUCKET_ELEMS; ++j, ++lun_p) { + if ((k * RL_BUCKET_ELEMS) + j > lun_cnt) + break; + int_to_scsilun(lun++, lun_p); + } + if (j < RL_BUCKET_ELEMS) + break; + n = j * sz_lun; + res = p_fill_from_dev_buffer(scp, arr, n, off_rsp); + if (res) + return res; + off_rsp += n; + } + if (wlun_cnt) { + int_to_scsilun(SCSI_W_LUN_REPORT_LUNS, lun_p); + ++j; + } + if (j > 0) + res = p_fill_from_dev_buffer(scp, arr, j * sz_lun, off_rsp); + return res; +} + +static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba, + unsigned int num, struct sdebug_dev_info *devip) +{ + int j; + unsigned char *kaddr, *buf; + unsigned int offset; + struct scsi_data_buffer *sdb = scsi_in(scp); + struct sg_mapping_iter miter; + + /* better not to use temporary buffer. */ + buf = kzalloc(scsi_bufflen(scp), GFP_ATOMIC); + if (!buf) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + + scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp)); + + offset = 0; + sg_miter_start(&miter, sdb->table.sgl, sdb->table.nents, + SG_MITER_ATOMIC | SG_MITER_TO_SG); + + while (sg_miter_next(&miter)) { + kaddr = miter.addr; + for (j = 0; j < miter.length; j++) + *(kaddr + j) ^= *(buf + offset + j); + + offset += miter.length; + } + sg_miter_stop(&miter); + kfree(buf); + + return 0; +} + +static int resp_xdwriteread_10(struct scsi_cmnd *scp, + struct sdebug_dev_info *devip) +{ + u8 *cmd = scp->cmnd; + u64 lba; + u32 num; + int errsts; + + if (!scsi_bidi_cmnd(scp)) { + mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, + INSUFF_RES_ASCQ); + return check_condition_result; + } + errsts = resp_read_dt0(scp, devip); + if (errsts) + return errsts; + if (!(cmd[1] & 0x4)) { /* DISABLE_WRITE is not set */ + errsts = resp_write_dt0(scp, devip); + if (errsts) + return errsts; + } + lba = get_unaligned_be32(cmd + 2); + num = get_unaligned_be16(cmd + 7); + return resp_xdwriteread(scp, lba, num, devip); +} + +static struct sdebug_queue *get_queue(struct scsi_cmnd *cmnd) +{ + u32 tag = blk_mq_unique_tag(cmnd->request); + u16 hwq = blk_mq_unique_tag_to_hwq(tag); + + pr_debug("tag=%#x, hwq=%d\n", tag, hwq); + if (WARN_ON_ONCE(hwq >= submit_queues)) + hwq = 0; + return sdebug_q_arr + hwq; +} + +/* Queued (deferred) command completions converge here. */ +static void sdebug_q_cmd_complete(struct sdebug_defer *sd_dp) +{ + bool aborted = sd_dp->aborted; + int qc_idx; + int retiring = 0; + unsigned long iflags; + struct sdebug_queue *sqp; + struct sdebug_queued_cmd *sqcp; + struct scsi_cmnd *scp; + struct sdebug_dev_info *devip; + + sd_dp->defer_t = SDEB_DEFER_NONE; + if (unlikely(aborted)) + sd_dp->aborted = false; + qc_idx = sd_dp->qc_idx; + sqp = sdebug_q_arr + sd_dp->sqa_idx; + if (sdebug_statistics) { + atomic_inc(&sdebug_completions); + if (raw_smp_processor_id() != sd_dp->issuing_cpu) + atomic_inc(&sdebug_miss_cpus); + } + if (unlikely((qc_idx < 0) || (qc_idx >= SDEBUG_CANQUEUE))) { + pr_err("wild qc_idx=%d\n", qc_idx); + return; + } + spin_lock_irqsave(&sqp->qc_lock, iflags); + sqcp = &sqp->qc_arr[qc_idx]; + scp = sqcp->a_cmnd; + if (unlikely(scp == NULL)) { + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + pr_err("scp is NULL, sqa_idx=%d, qc_idx=%d\n", + sd_dp->sqa_idx, qc_idx); + return; + } + devip = (struct sdebug_dev_info *)scp->device->hostdata; + if (likely(devip)) + atomic_dec(&devip->num_in_q); + else + pr_err("devip=NULL\n"); + if (unlikely(atomic_read(&retired_max_queue) > 0)) + retiring = 1; + + sqcp->a_cmnd = NULL; + if (unlikely(!test_and_clear_bit(qc_idx, sqp->in_use_bm))) { + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + pr_err("Unexpected completion\n"); + return; + } + + if (unlikely(retiring)) { /* user has reduced max_queue */ + int k, retval; + + retval = atomic_read(&retired_max_queue); + if (qc_idx >= retval) { + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + pr_err("index %d too large\n", retval); + return; + } + k = find_last_bit(sqp->in_use_bm, retval); + if ((k < sdebug_max_queue) || (k == retval)) + atomic_set(&retired_max_queue, 0); + else + atomic_set(&retired_max_queue, k + 1); + } + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + if (unlikely(aborted)) { + if (sdebug_verbose) + pr_info("bypassing scsi_done() due to aborted cmd\n"); + return; + } + scp->scsi_done(scp); /* callback to mid level */ +} + +/* When high resolution timer goes off this function is called. */ +static enum hrtimer_restart sdebug_q_cmd_hrt_complete(struct hrtimer *timer) +{ + struct sdebug_defer *sd_dp = container_of(timer, struct sdebug_defer, + hrt); + sdebug_q_cmd_complete(sd_dp); + return HRTIMER_NORESTART; +} + +/* When work queue schedules work, it calls this function. */ +static void sdebug_q_cmd_wq_complete(struct work_struct *work) +{ + struct sdebug_defer *sd_dp = container_of(work, struct sdebug_defer, + ew.work); + sdebug_q_cmd_complete(sd_dp); +} + +static bool got_shared_uuid; +static uuid_t shared_uuid; + +static struct sdebug_dev_info *sdebug_device_create( + struct sdebug_host_info *sdbg_host, gfp_t flags) +{ + struct sdebug_dev_info *devip; + + devip = kzalloc(sizeof(*devip), flags); + if (devip) { + if (sdebug_uuid_ctl == 1) + uuid_gen(&devip->lu_name); + else if (sdebug_uuid_ctl == 2) { + if (got_shared_uuid) + devip->lu_name = shared_uuid; + else { + uuid_gen(&shared_uuid); + got_shared_uuid = true; + devip->lu_name = shared_uuid; + } + } + devip->sdbg_host = sdbg_host; + list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list); + } + return devip; +} + +static struct sdebug_dev_info *find_build_dev_info(struct scsi_device *sdev) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *open_devip = NULL; + struct sdebug_dev_info *devip; + + sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host); + if (!sdbg_host) { + pr_err("Host info NULL\n"); + return NULL; + } + list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) { + if ((devip->used) && (devip->channel == sdev->channel) && + (devip->target == sdev->id) && + (devip->lun == sdev->lun)) + return devip; + else { + if ((!devip->used) && (!open_devip)) + open_devip = devip; + } + } + if (!open_devip) { /* try and make a new one */ + open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC); + if (!open_devip) { + pr_err("out of memory at line %d\n", __LINE__); + return NULL; + } + } + + open_devip->channel = sdev->channel; + open_devip->target = sdev->id; + open_devip->lun = sdev->lun; + open_devip->sdbg_host = sdbg_host; + atomic_set(&open_devip->num_in_q, 0); + set_bit(SDEBUG_UA_POR, open_devip->uas_bm); + open_devip->used = true; + return open_devip; +} + +static int scsi_debug_slave_alloc(struct scsi_device *sdp) +{ + if (sdebug_verbose) + pr_info("slave_alloc <%u %u %u %llu>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + blk_queue_flag_set(QUEUE_FLAG_BIDI, sdp->request_queue); + return 0; +} + +static int scsi_debug_slave_configure(struct scsi_device *sdp) +{ + struct sdebug_dev_info *devip = + (struct sdebug_dev_info *)sdp->hostdata; + + if (sdebug_verbose) + pr_info("slave_configure <%u %u %u %llu>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + if (sdp->host->max_cmd_len != SDEBUG_MAX_CMD_LEN) + sdp->host->max_cmd_len = SDEBUG_MAX_CMD_LEN; + if (devip == NULL) { + devip = find_build_dev_info(sdp); + if (devip == NULL) + return 1; /* no resources, will be marked offline */ + } + sdp->hostdata = devip; + blk_queue_max_segment_size(sdp->request_queue, -1U); + if (sdebug_no_uld) + sdp->no_uld_attach = 1; + config_cdb_len(sdp); + return 0; +} + +static void scsi_debug_slave_destroy(struct scsi_device *sdp) +{ + struct sdebug_dev_info *devip = + (struct sdebug_dev_info *)sdp->hostdata; + + if (sdebug_verbose) + pr_info("slave_destroy <%u %u %u %llu>\n", + sdp->host->host_no, sdp->channel, sdp->id, sdp->lun); + if (devip) { + /* make this slot available for re-use */ + devip->used = false; + sdp->hostdata = NULL; + } +} + +static void stop_qc_helper(struct sdebug_defer *sd_dp, + enum sdeb_defer_type defer_t) +{ + if (!sd_dp) + return; + if (defer_t == SDEB_DEFER_HRT) + hrtimer_cancel(&sd_dp->hrt); + else if (defer_t == SDEB_DEFER_WQ) + cancel_work_sync(&sd_dp->ew.work); +} + +/* If @cmnd found deletes its timer or work queue and returns true; else + returns false */ +static bool stop_queued_cmnd(struct scsi_cmnd *cmnd) +{ + unsigned long iflags; + int j, k, qmax, r_qmax; + enum sdeb_defer_type l_defer_t; + struct sdebug_queue *sqp; + struct sdebug_queued_cmd *sqcp; + struct sdebug_dev_info *devip; + struct sdebug_defer *sd_dp; + + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) { + spin_lock_irqsave(&sqp->qc_lock, iflags); + qmax = sdebug_max_queue; + r_qmax = atomic_read(&retired_max_queue); + if (r_qmax > qmax) + qmax = r_qmax; + for (k = 0; k < qmax; ++k) { + if (test_bit(k, sqp->in_use_bm)) { + sqcp = &sqp->qc_arr[k]; + if (cmnd != sqcp->a_cmnd) + continue; + /* found */ + devip = (struct sdebug_dev_info *) + cmnd->device->hostdata; + if (devip) + atomic_dec(&devip->num_in_q); + sqcp->a_cmnd = NULL; + sd_dp = sqcp->sd_dp; + if (sd_dp) { + l_defer_t = sd_dp->defer_t; + sd_dp->defer_t = SDEB_DEFER_NONE; + } else + l_defer_t = SDEB_DEFER_NONE; + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + stop_qc_helper(sd_dp, l_defer_t); + clear_bit(k, sqp->in_use_bm); + return true; + } + } + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + } + return false; +} + +/* Deletes (stops) timers or work queues of all queued commands */ +static void stop_all_queued(void) +{ + unsigned long iflags; + int j, k; + enum sdeb_defer_type l_defer_t; + struct sdebug_queue *sqp; + struct sdebug_queued_cmd *sqcp; + struct sdebug_dev_info *devip; + struct sdebug_defer *sd_dp; + + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) { + spin_lock_irqsave(&sqp->qc_lock, iflags); + for (k = 0; k < SDEBUG_CANQUEUE; ++k) { + if (test_bit(k, sqp->in_use_bm)) { + sqcp = &sqp->qc_arr[k]; + if (sqcp->a_cmnd == NULL) + continue; + devip = (struct sdebug_dev_info *) + sqcp->a_cmnd->device->hostdata; + if (devip) + atomic_dec(&devip->num_in_q); + sqcp->a_cmnd = NULL; + sd_dp = sqcp->sd_dp; + if (sd_dp) { + l_defer_t = sd_dp->defer_t; + sd_dp->defer_t = SDEB_DEFER_NONE; + } else + l_defer_t = SDEB_DEFER_NONE; + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + stop_qc_helper(sd_dp, l_defer_t); + clear_bit(k, sqp->in_use_bm); + spin_lock_irqsave(&sqp->qc_lock, iflags); + } + } + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + } +} + +/* Free queued command memory on heap */ +static void free_all_queued(void) +{ + int j, k; + struct sdebug_queue *sqp; + struct sdebug_queued_cmd *sqcp; + + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) { + for (k = 0; k < SDEBUG_CANQUEUE; ++k) { + sqcp = &sqp->qc_arr[k]; + kfree(sqcp->sd_dp); + sqcp->sd_dp = NULL; + } + } +} + +static int scsi_debug_abort(struct scsi_cmnd *SCpnt) +{ + bool ok; + + ++num_aborts; + if (SCpnt) { + ok = stop_queued_cmnd(SCpnt); + if (SCpnt->device && (SDEBUG_OPT_ALL_NOISE & sdebug_opts)) + sdev_printk(KERN_INFO, SCpnt->device, + "%s: command%s found\n", __func__, + ok ? "" : " not"); + } + return SUCCESS; +} + +static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt) +{ + ++num_dev_resets; + if (SCpnt && SCpnt->device) { + struct scsi_device *sdp = SCpnt->device; + struct sdebug_dev_info *devip = + (struct sdebug_dev_info *)sdp->hostdata; + + if (SDEBUG_OPT_ALL_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, sdp, "%s\n", __func__); + if (devip) + set_bit(SDEBUG_UA_POR, devip->uas_bm); + } + return SUCCESS; +} + +static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *devip; + struct scsi_device *sdp; + struct Scsi_Host *hp; + int k = 0; + + ++num_target_resets; + if (!SCpnt) + goto lie; + sdp = SCpnt->device; + if (!sdp) + goto lie; + if (SDEBUG_OPT_ALL_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, sdp, "%s\n", __func__); + hp = sdp->host; + if (!hp) + goto lie; + sdbg_host = *(struct sdebug_host_info **)shost_priv(hp); + if (sdbg_host) { + list_for_each_entry(devip, + &sdbg_host->dev_info_list, + dev_list) + if (devip->target == sdp->id) { + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + ++k; + } + } + if (SDEBUG_OPT_RESET_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, sdp, + "%s: %d device(s) found in target\n", __func__, k); +lie: + return SUCCESS; +} + +static int scsi_debug_bus_reset(struct scsi_cmnd *SCpnt) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *devip; + struct scsi_device *sdp; + struct Scsi_Host *hp; + int k = 0; + + ++num_bus_resets; + if (!(SCpnt && SCpnt->device)) + goto lie; + sdp = SCpnt->device; + if (SDEBUG_OPT_ALL_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, sdp, "%s\n", __func__); + hp = sdp->host; + if (hp) { + sdbg_host = *(struct sdebug_host_info **)shost_priv(hp); + if (sdbg_host) { + list_for_each_entry(devip, + &sdbg_host->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + ++k; + } + } + } + if (SDEBUG_OPT_RESET_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, sdp, + "%s: %d device(s) found in host\n", __func__, k); +lie: + return SUCCESS; +} + +static int scsi_debug_host_reset(struct scsi_cmnd *SCpnt) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *devip; + int k = 0; + + ++num_host_resets; + if ((SCpnt->device) && (SDEBUG_OPT_ALL_NOISE & sdebug_opts)) + sdev_printk(KERN_INFO, SCpnt->device, "%s\n", __func__); + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) { + list_for_each_entry(devip, &sdbg_host->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm); + ++k; + } + } + spin_unlock(&sdebug_host_list_lock); + stop_all_queued(); + if (SDEBUG_OPT_RESET_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, SCpnt->device, + "%s: %d device(s) found\n", __func__, k); + return SUCCESS; +} + +static void __init sdebug_build_parts(unsigned char *ramp, + unsigned long store_size) +{ + struct partition *pp; + int starts[SDEBUG_MAX_PARTS + 2]; + int sectors_per_part, num_sectors, k; + int heads_by_sects, start_sec, end_sec; + + /* assume partition table already zeroed */ + if ((sdebug_num_parts < 1) || (store_size < 1048576)) + return; + if (sdebug_num_parts > SDEBUG_MAX_PARTS) { + sdebug_num_parts = SDEBUG_MAX_PARTS; + pr_warn("reducing partitions to %d\n", SDEBUG_MAX_PARTS); + } + num_sectors = (int)sdebug_store_sectors; + sectors_per_part = (num_sectors - sdebug_sectors_per) + / sdebug_num_parts; + heads_by_sects = sdebug_heads * sdebug_sectors_per; + starts[0] = sdebug_sectors_per; + for (k = 1; k < sdebug_num_parts; ++k) + starts[k] = ((k * sectors_per_part) / heads_by_sects) + * heads_by_sects; + starts[sdebug_num_parts] = num_sectors; + starts[sdebug_num_parts + 1] = 0; + + ramp[510] = 0x55; /* magic partition markings */ + ramp[511] = 0xAA; + pp = (struct partition *)(ramp + 0x1be); + for (k = 0; starts[k + 1]; ++k, ++pp) { + start_sec = starts[k]; + end_sec = starts[k + 1] - 1; + pp->boot_ind = 0; + + pp->cyl = start_sec / heads_by_sects; + pp->head = (start_sec - (pp->cyl * heads_by_sects)) + / sdebug_sectors_per; + pp->sector = (start_sec % sdebug_sectors_per) + 1; + + pp->end_cyl = end_sec / heads_by_sects; + pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects)) + / sdebug_sectors_per; + pp->end_sector = (end_sec % sdebug_sectors_per) + 1; + + pp->start_sect = cpu_to_le32(start_sec); + pp->nr_sects = cpu_to_le32(end_sec - start_sec + 1); + pp->sys_ind = 0x83; /* plain Linux partition */ + } +} + +static void block_unblock_all_queues(bool block) +{ + int j; + struct sdebug_queue *sqp; + + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) + atomic_set(&sqp->blocked, (int)block); +} + +/* Adjust (by rounding down) the sdebug_cmnd_count so abs(every_nth)-1 + * commands will be processed normally before triggers occur. + */ +static void tweak_cmnd_count(void) +{ + int count, modulo; + + modulo = abs(sdebug_every_nth); + if (modulo < 2) + return; + block_unblock_all_queues(true); + count = atomic_read(&sdebug_cmnd_count); + atomic_set(&sdebug_cmnd_count, (count / modulo) * modulo); + block_unblock_all_queues(false); +} + +static void clear_queue_stats(void) +{ + atomic_set(&sdebug_cmnd_count, 0); + atomic_set(&sdebug_completions, 0); + atomic_set(&sdebug_miss_cpus, 0); + atomic_set(&sdebug_a_tsf, 0); +} + +static void setup_inject(struct sdebug_queue *sqp, + struct sdebug_queued_cmd *sqcp) +{ + if ((atomic_read(&sdebug_cmnd_count) % abs(sdebug_every_nth)) > 0) { + if (sdebug_every_nth > 0) + sqcp->inj_recovered = sqcp->inj_transport + = sqcp->inj_dif + = sqcp->inj_dix = sqcp->inj_short + = sqcp->inj_host_busy = sqcp->inj_cmd_abort = 0; + return; + } + sqcp->inj_recovered = !!(SDEBUG_OPT_RECOVERED_ERR & sdebug_opts); + sqcp->inj_transport = !!(SDEBUG_OPT_TRANSPORT_ERR & sdebug_opts); + sqcp->inj_dif = !!(SDEBUG_OPT_DIF_ERR & sdebug_opts); + sqcp->inj_dix = !!(SDEBUG_OPT_DIX_ERR & sdebug_opts); + sqcp->inj_short = !!(SDEBUG_OPT_SHORT_TRANSFER & sdebug_opts); + sqcp->inj_host_busy = !!(SDEBUG_OPT_HOST_BUSY & sdebug_opts); + sqcp->inj_cmd_abort = !!(SDEBUG_OPT_CMD_ABORT & sdebug_opts); +} + +/* Complete the processing of the thread that queued a SCSI command to this + * driver. It either completes the command by calling cmnd_done() or + * schedules a hr timer or work queue then returns 0. Returns + * SCSI_MLQUEUE_HOST_BUSY if temporarily out of resources. + */ +static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, + int scsi_result, + int (*pfp)(struct scsi_cmnd *, + struct sdebug_dev_info *), + int delta_jiff, int ndelay) +{ + unsigned long iflags; + int k, num_in_q, qdepth, inject; + struct sdebug_queue *sqp; + struct sdebug_queued_cmd *sqcp; + struct scsi_device *sdp; + struct sdebug_defer *sd_dp; + + if (unlikely(devip == NULL)) { + if (scsi_result == 0) + scsi_result = DID_NO_CONNECT << 16; + goto respond_in_thread; + } + sdp = cmnd->device; + + if (delta_jiff == 0) + goto respond_in_thread; + + /* schedule the response at a later time if resources permit */ + sqp = get_queue(cmnd); + spin_lock_irqsave(&sqp->qc_lock, iflags); + if (unlikely(atomic_read(&sqp->blocked))) { + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + return SCSI_MLQUEUE_HOST_BUSY; + } + num_in_q = atomic_read(&devip->num_in_q); + qdepth = cmnd->device->queue_depth; + inject = 0; + if (unlikely((qdepth > 0) && (num_in_q >= qdepth))) { + if (scsi_result) { + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + goto respond_in_thread; + } else + scsi_result = device_qfull_result; + } else if (unlikely(sdebug_every_nth && + (SDEBUG_OPT_RARE_TSF & sdebug_opts) && + (scsi_result == 0))) { + if ((num_in_q == (qdepth - 1)) && + (atomic_inc_return(&sdebug_a_tsf) >= + abs(sdebug_every_nth))) { + atomic_set(&sdebug_a_tsf, 0); + inject = 1; + scsi_result = device_qfull_result; + } + } + + k = find_first_zero_bit(sqp->in_use_bm, sdebug_max_queue); + if (unlikely(k >= sdebug_max_queue)) { + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + if (scsi_result) + goto respond_in_thread; + else if (SDEBUG_OPT_ALL_TSF & sdebug_opts) + scsi_result = device_qfull_result; + if (SDEBUG_OPT_Q_NOISE & sdebug_opts) + sdev_printk(KERN_INFO, sdp, + "%s: max_queue=%d exceeded, %s\n", + __func__, sdebug_max_queue, + (scsi_result ? "status: TASK SET FULL" : + "report: host busy")); + if (scsi_result) + goto respond_in_thread; + else + return SCSI_MLQUEUE_HOST_BUSY; + } + __set_bit(k, sqp->in_use_bm); + atomic_inc(&devip->num_in_q); + sqcp = &sqp->qc_arr[k]; + sqcp->a_cmnd = cmnd; + cmnd->host_scribble = (unsigned char *)sqcp; + sd_dp = sqcp->sd_dp; + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + if (unlikely(sdebug_every_nth && sdebug_any_injecting_opt)) + setup_inject(sqp, sqcp); + if (sd_dp == NULL) { + sd_dp = kzalloc(sizeof(*sd_dp), GFP_ATOMIC); + if (sd_dp == NULL) + return SCSI_MLQUEUE_HOST_BUSY; + } + + cmnd->result = pfp != NULL ? pfp(cmnd, devip) : 0; + if (cmnd->result & SDEG_RES_IMMED_MASK) { + /* + * This is the F_DELAY_OVERR case. No delay. + */ + cmnd->result &= ~SDEG_RES_IMMED_MASK; + delta_jiff = ndelay = 0; + } + if (cmnd->result == 0 && scsi_result != 0) + cmnd->result = scsi_result; + + if (unlikely(sdebug_verbose && cmnd->result)) + sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n", + __func__, cmnd->result); + + if (delta_jiff > 0 || ndelay > 0) { + ktime_t kt; + + if (delta_jiff > 0) { + kt = ns_to_ktime((u64)delta_jiff * (NSEC_PER_SEC / HZ)); + } else + kt = ndelay; + if (!sd_dp->init_hrt) { + sd_dp->init_hrt = true; + sqcp->sd_dp = sd_dp; + hrtimer_init(&sd_dp->hrt, CLOCK_MONOTONIC, + HRTIMER_MODE_REL_PINNED); + sd_dp->hrt.function = sdebug_q_cmd_hrt_complete; + sd_dp->sqa_idx = sqp - sdebug_q_arr; + sd_dp->qc_idx = k; + } + if (sdebug_statistics) + sd_dp->issuing_cpu = raw_smp_processor_id(); + sd_dp->defer_t = SDEB_DEFER_HRT; + hrtimer_start(&sd_dp->hrt, kt, HRTIMER_MODE_REL_PINNED); + } else { /* jdelay < 0, use work queue */ + if (!sd_dp->init_wq) { + sd_dp->init_wq = true; + sqcp->sd_dp = sd_dp; + sd_dp->sqa_idx = sqp - sdebug_q_arr; + sd_dp->qc_idx = k; + INIT_WORK(&sd_dp->ew.work, sdebug_q_cmd_wq_complete); + } + if (sdebug_statistics) + sd_dp->issuing_cpu = raw_smp_processor_id(); + sd_dp->defer_t = SDEB_DEFER_WQ; + if (unlikely(sqcp->inj_cmd_abort)) + sd_dp->aborted = true; + schedule_work(&sd_dp->ew.work); + if (unlikely(sqcp->inj_cmd_abort)) { + sdev_printk(KERN_INFO, sdp, "abort request tag %d\n", + cmnd->request->tag); + blk_abort_request(cmnd->request); + } + } + if (unlikely((SDEBUG_OPT_Q_NOISE & sdebug_opts) && + (scsi_result == device_qfull_result))) + sdev_printk(KERN_INFO, sdp, + "%s: num_in_q=%d +1, %s%s\n", __func__, + num_in_q, (inject ? "<inject> " : ""), + "status: TASK SET FULL"); + return 0; + +respond_in_thread: /* call back to mid-layer using invocation thread */ + cmnd->result = pfp != NULL ? pfp(cmnd, devip) : 0; + cmnd->result &= ~SDEG_RES_IMMED_MASK; + if (cmnd->result == 0 && scsi_result != 0) + cmnd->result = scsi_result; + cmnd->scsi_done(cmnd); + return 0; +} + +/* Note: The following macros create attribute files in the + /sys/module/scsi_debug/parameters directory. Unfortunately this + driver is unaware of a change and cannot trigger auxiliary actions + as it can when the corresponding attribute in the + /sys/bus/pseudo/drivers/scsi_debug directory is changed. + */ +module_param_named(add_host, sdebug_add_host, int, S_IRUGO | S_IWUSR); +module_param_named(ato, sdebug_ato, int, S_IRUGO); +module_param_named(cdb_len, sdebug_cdb_len, int, 0644); +module_param_named(clustering, sdebug_clustering, bool, S_IRUGO | S_IWUSR); +module_param_named(delay, sdebug_jdelay, int, S_IRUGO | S_IWUSR); +module_param_named(dev_size_mb, sdebug_dev_size_mb, int, S_IRUGO); +module_param_named(dif, sdebug_dif, int, S_IRUGO); +module_param_named(dix, sdebug_dix, int, S_IRUGO); +module_param_named(dsense, sdebug_dsense, int, S_IRUGO | S_IWUSR); +module_param_named(every_nth, sdebug_every_nth, int, S_IRUGO | S_IWUSR); +module_param_named(fake_rw, sdebug_fake_rw, int, S_IRUGO | S_IWUSR); +module_param_named(guard, sdebug_guard, uint, S_IRUGO); +module_param_named(host_lock, sdebug_host_lock, bool, S_IRUGO | S_IWUSR); +module_param_string(inq_vendor, sdebug_inq_vendor_id, + sizeof(sdebug_inq_vendor_id), S_IRUGO|S_IWUSR); +module_param_string(inq_product, sdebug_inq_product_id, + sizeof(sdebug_inq_product_id), S_IRUGO|S_IWUSR); +module_param_string(inq_rev, sdebug_inq_product_rev, + sizeof(sdebug_inq_product_rev), S_IRUGO|S_IWUSR); +module_param_named(lbpu, sdebug_lbpu, int, S_IRUGO); +module_param_named(lbpws, sdebug_lbpws, int, S_IRUGO); +module_param_named(lbpws10, sdebug_lbpws10, int, S_IRUGO); +module_param_named(lbprz, sdebug_lbprz, int, S_IRUGO); +module_param_named(lowest_aligned, sdebug_lowest_aligned, int, S_IRUGO); +module_param_named(max_luns, sdebug_max_luns, int, S_IRUGO | S_IWUSR); +module_param_named(max_queue, sdebug_max_queue, int, S_IRUGO | S_IWUSR); +module_param_named(medium_error_start, sdebug_medium_error_start, int, S_IRUGO | S_IWUSR); +module_param_named(medium_error_count, sdebug_medium_error_count, int, S_IRUGO | S_IWUSR); +module_param_named(ndelay, sdebug_ndelay, int, S_IRUGO | S_IWUSR); +module_param_named(no_lun_0, sdebug_no_lun_0, int, S_IRUGO | S_IWUSR); +module_param_named(no_uld, sdebug_no_uld, int, S_IRUGO); +module_param_named(num_parts, sdebug_num_parts, int, S_IRUGO); +module_param_named(num_tgts, sdebug_num_tgts, int, S_IRUGO | S_IWUSR); +module_param_named(opt_blks, sdebug_opt_blks, int, S_IRUGO); +module_param_named(opts, sdebug_opts, int, S_IRUGO | S_IWUSR); +module_param_named(physblk_exp, sdebug_physblk_exp, int, S_IRUGO); +module_param_named(opt_xferlen_exp, sdebug_opt_xferlen_exp, int, S_IRUGO); +module_param_named(ptype, sdebug_ptype, int, S_IRUGO | S_IWUSR); +module_param_named(removable, sdebug_removable, bool, S_IRUGO | S_IWUSR); +module_param_named(scsi_level, sdebug_scsi_level, int, S_IRUGO); +module_param_named(sector_size, sdebug_sector_size, int, S_IRUGO); +module_param_named(statistics, sdebug_statistics, bool, S_IRUGO | S_IWUSR); +module_param_named(strict, sdebug_strict, bool, S_IRUGO | S_IWUSR); +module_param_named(submit_queues, submit_queues, int, S_IRUGO); +module_param_named(unmap_alignment, sdebug_unmap_alignment, int, S_IRUGO); +module_param_named(unmap_granularity, sdebug_unmap_granularity, int, S_IRUGO); +module_param_named(unmap_max_blocks, sdebug_unmap_max_blocks, int, S_IRUGO); +module_param_named(unmap_max_desc, sdebug_unmap_max_desc, int, S_IRUGO); +module_param_named(virtual_gb, sdebug_virtual_gb, int, S_IRUGO | S_IWUSR); +module_param_named(uuid_ctl, sdebug_uuid_ctl, int, S_IRUGO); +module_param_named(vpd_use_hostno, sdebug_vpd_use_hostno, int, + S_IRUGO | S_IWUSR); +module_param_named(write_same_length, sdebug_write_same_length, int, + S_IRUGO | S_IWUSR); + +MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert"); +MODULE_DESCRIPTION("SCSI debug adapter driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(SDEBUG_VERSION); + +MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)"); +MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)"); +MODULE_PARM_DESC(cdb_len, "suggest CDB lengths to drivers (def=10)"); +MODULE_PARM_DESC(clustering, "when set enables larger transfers (def=0)"); +MODULE_PARM_DESC(delay, "response delay (def=1 jiffy); 0:imm, -1,-2:tiny"); +MODULE_PARM_DESC(dev_size_mb, "size in MiB of ram shared by devs(def=8)"); +MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)"); +MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)"); +MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)"); +MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)"); +MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)"); +MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)"); +MODULE_PARM_DESC(host_lock, "host_lock is ignored (def=0)"); +MODULE_PARM_DESC(inq_vendor, "SCSI INQUIRY vendor string (def=\"Linux\")"); +MODULE_PARM_DESC(inq_product, "SCSI INQUIRY product string (def=\"scsi_debug\")"); +MODULE_PARM_DESC(inq_rev, "SCSI INQUIRY revision string (def=\"" + SDEBUG_VERSION "\")"); +MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)"); +MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)"); +MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)"); +MODULE_PARM_DESC(lbprz, + "on read unmapped LBs return 0 when 1 (def), return 0xff when 2"); +MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)"); +MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)"); +MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to max(def))"); +MODULE_PARM_DESC(medium_error_start, "starting sector number to return MEDIUM error"); +MODULE_PARM_DESC(medium_error_count, "count of sectors to return follow on MEDIUM error"); +MODULE_PARM_DESC(ndelay, "response delay in nanoseconds (def=0 -> ignore)"); +MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)"); +MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))"); +MODULE_PARM_DESC(num_parts, "number of partitions(def=0)"); +MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)"); +MODULE_PARM_DESC(opt_blks, "optimal transfer length in blocks (def=1024)"); +MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)"); +MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)"); +MODULE_PARM_DESC(opt_xferlen_exp, "optimal transfer length granularity exponent (def=physblk_exp)"); +MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])"); +MODULE_PARM_DESC(removable, "claim to have removable media (def=0)"); +MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=7[SPC-5])"); +MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)"); +MODULE_PARM_DESC(statistics, "collect statistics on commands, queues (def=0)"); +MODULE_PARM_DESC(strict, "stricter checks: reserved field in cdb (def=0)"); +MODULE_PARM_DESC(submit_queues, "support for block multi-queue (def=1)"); +MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)"); +MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)"); +MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)"); +MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)"); +MODULE_PARM_DESC(uuid_ctl, + "1->use uuid for lu name, 0->don't, 2->all use same (def=0)"); +MODULE_PARM_DESC(virtual_gb, "virtual gigabyte (GiB) size (def=0 -> use dev_size_mb)"); +MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)"); +MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)"); + +#define SDEBUG_INFO_LEN 256 +static char sdebug_info[SDEBUG_INFO_LEN]; + +static const char *scsi_debug_info(struct Scsi_Host *shp) +{ + int k; + + k = scnprintf(sdebug_info, SDEBUG_INFO_LEN, "%s: version %s [%s]\n", + my_name, SDEBUG_VERSION, sdebug_version_date); + if (k >= (SDEBUG_INFO_LEN - 1)) + return sdebug_info; + scnprintf(sdebug_info + k, SDEBUG_INFO_LEN - k, + " dev_size_mb=%d, opts=0x%x, submit_queues=%d, %s=%d", + sdebug_dev_size_mb, sdebug_opts, submit_queues, + "statistics", (int)sdebug_statistics); + return sdebug_info; +} + +/* 'echo <val> > /proc/scsi/scsi_debug/<host_id>' writes to opts */ +static int scsi_debug_write_info(struct Scsi_Host *host, char *buffer, + int length) +{ + char arr[16]; + int opts; + int minLen = length > 15 ? 15 : length; + + if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) + return -EACCES; + memcpy(arr, buffer, minLen); + arr[minLen] = '\0'; + if (1 != sscanf(arr, "%d", &opts)) + return -EINVAL; + sdebug_opts = opts; + sdebug_verbose = !!(SDEBUG_OPT_NOISE & opts); + sdebug_any_injecting_opt = !!(SDEBUG_OPT_ALL_INJECTING & opts); + if (sdebug_every_nth != 0) + tweak_cmnd_count(); + return length; +} + +/* Output seen with 'cat /proc/scsi/scsi_debug/<host_id>'. It will be the + * same for each scsi_debug host (if more than one). Some of the counters + * output are not atomics so might be inaccurate in a busy system. */ +static int scsi_debug_show_info(struct seq_file *m, struct Scsi_Host *host) +{ + int f, j, l; + struct sdebug_queue *sqp; + + seq_printf(m, "scsi_debug adapter driver, version %s [%s]\n", + SDEBUG_VERSION, sdebug_version_date); + seq_printf(m, "num_tgts=%d, %ssize=%d MB, opts=0x%x, every_nth=%d\n", + sdebug_num_tgts, "shared (ram) ", sdebug_dev_size_mb, + sdebug_opts, sdebug_every_nth); + seq_printf(m, "delay=%d, ndelay=%d, max_luns=%d, sector_size=%d %s\n", + sdebug_jdelay, sdebug_ndelay, sdebug_max_luns, + sdebug_sector_size, "bytes"); + seq_printf(m, "cylinders=%d, heads=%d, sectors=%d, command aborts=%d\n", + sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per, + num_aborts); + seq_printf(m, "RESETs: device=%d, target=%d, bus=%d, host=%d\n", + num_dev_resets, num_target_resets, num_bus_resets, + num_host_resets); + seq_printf(m, "dix_reads=%d, dix_writes=%d, dif_errors=%d\n", + dix_reads, dix_writes, dif_errors); + seq_printf(m, "usec_in_jiffy=%lu, statistics=%d\n", TICK_NSEC / 1000, + sdebug_statistics); + seq_printf(m, "cmnd_count=%d, completions=%d, %s=%d, a_tsf=%d\n", + atomic_read(&sdebug_cmnd_count), + atomic_read(&sdebug_completions), + "miss_cpus", atomic_read(&sdebug_miss_cpus), + atomic_read(&sdebug_a_tsf)); + + seq_printf(m, "submit_queues=%d\n", submit_queues); + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) { + seq_printf(m, " queue %d:\n", j); + f = find_first_bit(sqp->in_use_bm, sdebug_max_queue); + if (f != sdebug_max_queue) { + l = find_last_bit(sqp->in_use_bm, sdebug_max_queue); + seq_printf(m, " in_use_bm BUSY: %s: %d,%d\n", + "first,last bits", f, l); + } + } + return 0; +} + +static ssize_t delay_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_jdelay); +} +/* Returns -EBUSY if jdelay is being changed and commands are queued. The unit + * of delay is jiffies. + */ +static ssize_t delay_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int jdelay, res; + + if (count > 0 && sscanf(buf, "%d", &jdelay) == 1) { + res = count; + if (sdebug_jdelay != jdelay) { + int j, k; + struct sdebug_queue *sqp; + + block_unblock_all_queues(true); + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; + ++j, ++sqp) { + k = find_first_bit(sqp->in_use_bm, + sdebug_max_queue); + if (k != sdebug_max_queue) { + res = -EBUSY; /* queued commands */ + break; + } + } + if (res > 0) { + sdebug_jdelay = jdelay; + sdebug_ndelay = 0; + } + block_unblock_all_queues(false); + } + return res; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(delay); + +static ssize_t ndelay_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_ndelay); +} +/* Returns -EBUSY if ndelay is being changed and commands are queued */ +/* If > 0 and accepted then sdebug_jdelay is set to JDELAY_OVERRIDDEN */ +static ssize_t ndelay_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int ndelay, res; + + if ((count > 0) && (1 == sscanf(buf, "%d", &ndelay)) && + (ndelay >= 0) && (ndelay < (1000 * 1000 * 1000))) { + res = count; + if (sdebug_ndelay != ndelay) { + int j, k; + struct sdebug_queue *sqp; + + block_unblock_all_queues(true); + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; + ++j, ++sqp) { + k = find_first_bit(sqp->in_use_bm, + sdebug_max_queue); + if (k != sdebug_max_queue) { + res = -EBUSY; /* queued commands */ + break; + } + } + if (res > 0) { + sdebug_ndelay = ndelay; + sdebug_jdelay = ndelay ? JDELAY_OVERRIDDEN + : DEF_JDELAY; + } + block_unblock_all_queues(false); + } + return res; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(ndelay); + +static ssize_t opts_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "0x%x\n", sdebug_opts); +} + +static ssize_t opts_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int opts; + char work[20]; + + if (sscanf(buf, "%10s", work) == 1) { + if (strncasecmp(work, "0x", 2) == 0) { + if (kstrtoint(work + 2, 16, &opts) == 0) + goto opts_done; + } else { + if (kstrtoint(work, 10, &opts) == 0) + goto opts_done; + } + } + return -EINVAL; +opts_done: + sdebug_opts = opts; + sdebug_verbose = !!(SDEBUG_OPT_NOISE & opts); + sdebug_any_injecting_opt = !!(SDEBUG_OPT_ALL_INJECTING & opts); + tweak_cmnd_count(); + return count; +} +static DRIVER_ATTR_RW(opts); + +static ssize_t ptype_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_ptype); +} +static ssize_t ptype_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_ptype = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(ptype); + +static ssize_t dsense_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dsense); +} +static ssize_t dsense_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_dsense = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(dsense); + +static ssize_t fake_rw_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_fake_rw); +} +static ssize_t fake_rw_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + n = (n > 0); + sdebug_fake_rw = (sdebug_fake_rw > 0); + if (sdebug_fake_rw != n) { + if ((0 == n) && (NULL == fake_storep)) { + unsigned long sz = + (unsigned long)sdebug_dev_size_mb * + 1048576; + + fake_storep = vzalloc(sz); + if (NULL == fake_storep) { + pr_err("out of memory, 9\n"); + return -ENOMEM; + } + } + sdebug_fake_rw = n; + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(fake_rw); + +static ssize_t no_lun_0_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_no_lun_0); +} +static ssize_t no_lun_0_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_no_lun_0 = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(no_lun_0); + +static ssize_t num_tgts_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_num_tgts); +} +static ssize_t num_tgts_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_num_tgts = n; + sdebug_max_tgts_luns(); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(num_tgts); + +static ssize_t dev_size_mb_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dev_size_mb); +} +static DRIVER_ATTR_RO(dev_size_mb); + +static ssize_t num_parts_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_num_parts); +} +static DRIVER_ATTR_RO(num_parts); + +static ssize_t every_nth_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_every_nth); +} +static ssize_t every_nth_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int nth; + + if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) { + sdebug_every_nth = nth; + if (nth && !sdebug_statistics) { + pr_info("every_nth needs statistics=1, set it\n"); + sdebug_statistics = true; + } + tweak_cmnd_count(); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(every_nth); + +static ssize_t max_luns_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_max_luns); +} +static ssize_t max_luns_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + bool changed; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + if (n > 256) { + pr_warn("max_luns can be no more than 256\n"); + return -EINVAL; + } + changed = (sdebug_max_luns != n); + sdebug_max_luns = n; + sdebug_max_tgts_luns(); + if (changed && (sdebug_scsi_level >= 5)) { /* >= SPC-3 */ + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, + host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_LUNS_CHANGED, + dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(max_luns); + +static ssize_t max_queue_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_max_queue); +} +/* N.B. max_queue can be changed while there are queued commands. In flight + * commands beyond the new max_queue will be completed. */ +static ssize_t max_queue_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int j, n, k, a; + struct sdebug_queue *sqp; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) && + (n <= SDEBUG_CANQUEUE)) { + block_unblock_all_queues(true); + k = 0; + for (j = 0, sqp = sdebug_q_arr; j < submit_queues; + ++j, ++sqp) { + a = find_last_bit(sqp->in_use_bm, SDEBUG_CANQUEUE); + if (a > k) + k = a; + } + sdebug_max_queue = n; + if (k == SDEBUG_CANQUEUE) + atomic_set(&retired_max_queue, 0); + else if (k >= n) + atomic_set(&retired_max_queue, k + 1); + else + atomic_set(&retired_max_queue, 0); + block_unblock_all_queues(false); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(max_queue); + +static ssize_t no_uld_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_no_uld); +} +static DRIVER_ATTR_RO(no_uld); + +static ssize_t scsi_level_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_scsi_level); +} +static DRIVER_ATTR_RO(scsi_level); + +static ssize_t virtual_gb_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_virtual_gb); +} +static ssize_t virtual_gb_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + bool changed; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + changed = (sdebug_virtual_gb != n); + sdebug_virtual_gb = n; + sdebug_capacity = get_sdebug_capacity(); + if (changed) { + struct sdebug_host_info *sdhp; + struct sdebug_dev_info *dp; + + spin_lock(&sdebug_host_list_lock); + list_for_each_entry(sdhp, &sdebug_host_list, + host_list) { + list_for_each_entry(dp, &sdhp->dev_info_list, + dev_list) { + set_bit(SDEBUG_UA_CAPACITY_CHANGED, + dp->uas_bm); + } + } + spin_unlock(&sdebug_host_list_lock); + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(virtual_gb); + +static ssize_t add_host_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_add_host); +} + +static int sdebug_add_adapter(void); +static void sdebug_remove_adapter(void); + +static ssize_t add_host_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int delta_hosts; + + if (sscanf(buf, "%d", &delta_hosts) != 1) + return -EINVAL; + if (delta_hosts > 0) { + do { + sdebug_add_adapter(); + } while (--delta_hosts); + } else if (delta_hosts < 0) { + do { + sdebug_remove_adapter(); + } while (++delta_hosts); + } + return count; +} +static DRIVER_ATTR_RW(add_host); + +static ssize_t vpd_use_hostno_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_vpd_use_hostno); +} +static ssize_t vpd_use_hostno_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_vpd_use_hostno = n; + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(vpd_use_hostno); + +static ssize_t statistics_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", (int)sdebug_statistics); +} +static ssize_t statistics_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (sscanf(buf, "%d", &n) == 1) && (n >= 0)) { + if (n > 0) + sdebug_statistics = true; + else { + clear_queue_stats(); + sdebug_statistics = false; + } + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(statistics); + +static ssize_t sector_size_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%u\n", sdebug_sector_size); +} +static DRIVER_ATTR_RO(sector_size); + +static ssize_t submit_queues_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", submit_queues); +} +static DRIVER_ATTR_RO(submit_queues); + +static ssize_t dix_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dix); +} +static DRIVER_ATTR_RO(dix); + +static ssize_t dif_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dif); +} +static DRIVER_ATTR_RO(dif); + +static ssize_t guard_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%u\n", sdebug_guard); +} +static DRIVER_ATTR_RO(guard); + +static ssize_t ato_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_ato); +} +static DRIVER_ATTR_RO(ato); + +static ssize_t map_show(struct device_driver *ddp, char *buf) +{ + ssize_t count; + + if (!scsi_debug_lbp()) + return scnprintf(buf, PAGE_SIZE, "0-%u\n", + sdebug_store_sectors); + + count = scnprintf(buf, PAGE_SIZE - 1, "%*pbl", + (int)map_size, map_storep); + buf[count++] = '\n'; + buf[count] = '\0'; + + return count; +} +static DRIVER_ATTR_RO(map); + +static ssize_t removable_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_removable ? 1 : 0); +} +static ssize_t removable_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_removable = (n > 0); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(removable); + +static ssize_t host_lock_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_host_lock); +} +/* N.B. sdebug_host_lock does nothing, kept for backward compatibility */ +static ssize_t host_lock_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_host_lock = (n > 0); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(host_lock); + +static ssize_t strict_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_strict); +} +static ssize_t strict_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int n; + + if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) { + sdebug_strict = (n > 0); + return count; + } + return -EINVAL; +} +static DRIVER_ATTR_RW(strict); + +static ssize_t uuid_ctl_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_uuid_ctl); +} +static DRIVER_ATTR_RO(uuid_ctl); + +static ssize_t cdb_len_show(struct device_driver *ddp, char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_cdb_len); +} +static ssize_t cdb_len_store(struct device_driver *ddp, const char *buf, + size_t count) +{ + int ret, n; + + ret = kstrtoint(buf, 0, &n); + if (ret) + return ret; + sdebug_cdb_len = n; + all_config_cdb_len(); + return count; +} +static DRIVER_ATTR_RW(cdb_len); + + +/* Note: The following array creates attribute files in the + /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these + files (over those found in the /sys/module/scsi_debug/parameters + directory) is that auxiliary actions can be triggered when an attribute + is changed. For example see: sdebug_add_host_store() above. + */ + +static struct attribute *sdebug_drv_attrs[] = { + &driver_attr_delay.attr, + &driver_attr_opts.attr, + &driver_attr_ptype.attr, + &driver_attr_dsense.attr, + &driver_attr_fake_rw.attr, + &driver_attr_no_lun_0.attr, + &driver_attr_num_tgts.attr, + &driver_attr_dev_size_mb.attr, + &driver_attr_num_parts.attr, + &driver_attr_every_nth.attr, + &driver_attr_max_luns.attr, + &driver_attr_max_queue.attr, + &driver_attr_no_uld.attr, + &driver_attr_scsi_level.attr, + &driver_attr_virtual_gb.attr, + &driver_attr_add_host.attr, + &driver_attr_vpd_use_hostno.attr, + &driver_attr_sector_size.attr, + &driver_attr_statistics.attr, + &driver_attr_submit_queues.attr, + &driver_attr_dix.attr, + &driver_attr_dif.attr, + &driver_attr_guard.attr, + &driver_attr_ato.attr, + &driver_attr_map.attr, + &driver_attr_removable.attr, + &driver_attr_host_lock.attr, + &driver_attr_ndelay.attr, + &driver_attr_strict.attr, + &driver_attr_uuid_ctl.attr, + &driver_attr_cdb_len.attr, + NULL, +}; +ATTRIBUTE_GROUPS(sdebug_drv); + +static struct device *pseudo_primary; + +static int __init scsi_debug_init(void) +{ + unsigned long sz; + int host_to_add; + int k; + int ret; + + atomic_set(&retired_max_queue, 0); + + if (sdebug_ndelay >= 1000 * 1000 * 1000) { + pr_warn("ndelay must be less than 1 second, ignored\n"); + sdebug_ndelay = 0; + } else if (sdebug_ndelay > 0) + sdebug_jdelay = JDELAY_OVERRIDDEN; + + switch (sdebug_sector_size) { + case 512: + case 1024: + case 2048: + case 4096: + break; + default: + pr_err("invalid sector_size %d\n", sdebug_sector_size); + return -EINVAL; + } + + switch (sdebug_dif) { + case T10_PI_TYPE0_PROTECTION: + break; + case T10_PI_TYPE1_PROTECTION: + case T10_PI_TYPE2_PROTECTION: + case T10_PI_TYPE3_PROTECTION: + have_dif_prot = true; + break; + + default: + pr_err("dif must be 0, 1, 2 or 3\n"); + return -EINVAL; + } + + if (sdebug_num_tgts < 0) { + pr_err("num_tgts must be >= 0\n"); + return -EINVAL; + } + + if (sdebug_guard > 1) { + pr_err("guard must be 0 or 1\n"); + return -EINVAL; + } + + if (sdebug_ato > 1) { + pr_err("ato must be 0 or 1\n"); + return -EINVAL; + } + + if (sdebug_physblk_exp > 15) { + pr_err("invalid physblk_exp %u\n", sdebug_physblk_exp); + return -EINVAL; + } + if (sdebug_max_luns > 256) { + pr_warn("max_luns can be no more than 256, use default\n"); + sdebug_max_luns = DEF_MAX_LUNS; + } + + if (sdebug_lowest_aligned > 0x3fff) { + pr_err("lowest_aligned too big: %u\n", sdebug_lowest_aligned); + return -EINVAL; + } + + if (submit_queues < 1) { + pr_err("submit_queues must be 1 or more\n"); + return -EINVAL; + } + + if ((sdebug_max_queue > SDEBUG_CANQUEUE) || (sdebug_max_queue < 1)) { + pr_err("max_queue must be in range [1, %d]\n", SDEBUG_CANQUEUE); + return -EINVAL; + } + + sdebug_q_arr = kcalloc(submit_queues, sizeof(struct sdebug_queue), + GFP_KERNEL); + if (sdebug_q_arr == NULL) + return -ENOMEM; + for (k = 0; k < submit_queues; ++k) + spin_lock_init(&sdebug_q_arr[k].qc_lock); + + if (sdebug_dev_size_mb < 1) + sdebug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */ + sz = (unsigned long)sdebug_dev_size_mb * 1048576; + sdebug_store_sectors = sz / sdebug_sector_size; + sdebug_capacity = get_sdebug_capacity(); + + /* play around with geometry, don't waste too much on track 0 */ + sdebug_heads = 8; + sdebug_sectors_per = 32; + if (sdebug_dev_size_mb >= 256) + sdebug_heads = 64; + else if (sdebug_dev_size_mb >= 16) + sdebug_heads = 32; + sdebug_cylinders_per = (unsigned long)sdebug_capacity / + (sdebug_sectors_per * sdebug_heads); + if (sdebug_cylinders_per >= 1024) { + /* other LLDs do this; implies >= 1GB ram disk ... */ + sdebug_heads = 255; + sdebug_sectors_per = 63; + sdebug_cylinders_per = (unsigned long)sdebug_capacity / + (sdebug_sectors_per * sdebug_heads); + } + + if (sdebug_fake_rw == 0) { + fake_storep = vzalloc(sz); + if (NULL == fake_storep) { + pr_err("out of memory, 1\n"); + ret = -ENOMEM; + goto free_q_arr; + } + if (sdebug_num_parts > 0) + sdebug_build_parts(fake_storep, sz); + } + + if (sdebug_dix) { + int dif_size; + + dif_size = sdebug_store_sectors * sizeof(struct t10_pi_tuple); + dif_storep = vmalloc(dif_size); + + pr_err("dif_storep %u bytes @ %p\n", dif_size, dif_storep); + + if (dif_storep == NULL) { + pr_err("out of mem. (DIX)\n"); + ret = -ENOMEM; + goto free_vm; + } + + memset(dif_storep, 0xff, dif_size); + } + + /* Logical Block Provisioning */ + if (scsi_debug_lbp()) { + sdebug_unmap_max_blocks = + clamp(sdebug_unmap_max_blocks, 0U, 0xffffffffU); + + sdebug_unmap_max_desc = + clamp(sdebug_unmap_max_desc, 0U, 256U); + + sdebug_unmap_granularity = + clamp(sdebug_unmap_granularity, 1U, 0xffffffffU); + + if (sdebug_unmap_alignment && + sdebug_unmap_granularity <= + sdebug_unmap_alignment) { + pr_err("ERR: unmap_granularity <= unmap_alignment\n"); + ret = -EINVAL; + goto free_vm; + } + + map_size = lba_to_map_index(sdebug_store_sectors - 1) + 1; + map_storep = vmalloc(array_size(sizeof(long), + BITS_TO_LONGS(map_size))); + + pr_info("%lu provisioning blocks\n", map_size); + + if (map_storep == NULL) { + pr_err("out of mem. (MAP)\n"); + ret = -ENOMEM; + goto free_vm; + } + + bitmap_zero(map_storep, map_size); + + /* Map first 1KB for partition table */ + if (sdebug_num_parts) + map_region(0, 2); + } + + pseudo_primary = root_device_register("pseudo_0"); + if (IS_ERR(pseudo_primary)) { + pr_warn("root_device_register() error\n"); + ret = PTR_ERR(pseudo_primary); + goto free_vm; + } + ret = bus_register(&pseudo_lld_bus); + if (ret < 0) { + pr_warn("bus_register error: %d\n", ret); + goto dev_unreg; + } + ret = driver_register(&sdebug_driverfs_driver); + if (ret < 0) { + pr_warn("driver_register error: %d\n", ret); + goto bus_unreg; + } + + host_to_add = sdebug_add_host; + sdebug_add_host = 0; + + for (k = 0; k < host_to_add; k++) { + if (sdebug_add_adapter()) { + pr_err("sdebug_add_adapter failed k=%d\n", k); + break; + } + } + + if (sdebug_verbose) + pr_info("built %d host(s)\n", sdebug_add_host); + + return 0; + +bus_unreg: + bus_unregister(&pseudo_lld_bus); +dev_unreg: + root_device_unregister(pseudo_primary); +free_vm: + vfree(map_storep); + vfree(dif_storep); + vfree(fake_storep); +free_q_arr: + kfree(sdebug_q_arr); + return ret; +} + +static void __exit scsi_debug_exit(void) +{ + int k = sdebug_add_host; + + stop_all_queued(); + for (; k; k--) + sdebug_remove_adapter(); + free_all_queued(); + driver_unregister(&sdebug_driverfs_driver); + bus_unregister(&pseudo_lld_bus); + root_device_unregister(pseudo_primary); + + vfree(map_storep); + vfree(dif_storep); + vfree(fake_storep); + kfree(sdebug_q_arr); +} + +device_initcall(scsi_debug_init); +module_exit(scsi_debug_exit); + +static void sdebug_release_adapter(struct device *dev) +{ + struct sdebug_host_info *sdbg_host; + + sdbg_host = to_sdebug_host(dev); + kfree(sdbg_host); +} + +static int sdebug_add_adapter(void) +{ + int k, devs_per_host; + int error = 0; + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *sdbg_devinfo, *tmp; + + sdbg_host = kzalloc(sizeof(*sdbg_host), GFP_KERNEL); + if (sdbg_host == NULL) { + pr_err("out of memory at line %d\n", __LINE__); + return -ENOMEM; + } + + INIT_LIST_HEAD(&sdbg_host->dev_info_list); + + devs_per_host = sdebug_num_tgts * sdebug_max_luns; + for (k = 0; k < devs_per_host; k++) { + sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL); + if (!sdbg_devinfo) { + pr_err("out of memory at line %d\n", __LINE__); + error = -ENOMEM; + goto clean; + } + } + + spin_lock(&sdebug_host_list_lock); + list_add_tail(&sdbg_host->host_list, &sdebug_host_list); + spin_unlock(&sdebug_host_list_lock); + + sdbg_host->dev.bus = &pseudo_lld_bus; + sdbg_host->dev.parent = pseudo_primary; + sdbg_host->dev.release = &sdebug_release_adapter; + dev_set_name(&sdbg_host->dev, "adapter%d", sdebug_add_host); + + error = device_register(&sdbg_host->dev); + + if (error) + goto clean; + + ++sdebug_add_host; + return error; + +clean: + list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list, + dev_list) { + list_del(&sdbg_devinfo->dev_list); + kfree(sdbg_devinfo); + } + + kfree(sdbg_host); + return error; +} + +static void sdebug_remove_adapter(void) +{ + struct sdebug_host_info *sdbg_host = NULL; + + spin_lock(&sdebug_host_list_lock); + if (!list_empty(&sdebug_host_list)) { + sdbg_host = list_entry(sdebug_host_list.prev, + struct sdebug_host_info, host_list); + list_del(&sdbg_host->host_list); + } + spin_unlock(&sdebug_host_list_lock); + + if (!sdbg_host) + return; + + device_unregister(&sdbg_host->dev); + --sdebug_add_host; +} + +static int sdebug_change_qdepth(struct scsi_device *sdev, int qdepth) +{ + int num_in_q = 0; + struct sdebug_dev_info *devip; + + block_unblock_all_queues(true); + devip = (struct sdebug_dev_info *)sdev->hostdata; + if (NULL == devip) { + block_unblock_all_queues(false); + return -ENODEV; + } + num_in_q = atomic_read(&devip->num_in_q); + + if (qdepth < 1) + qdepth = 1; + /* allow to exceed max host qc_arr elements for testing */ + if (qdepth > SDEBUG_CANQUEUE + 10) + qdepth = SDEBUG_CANQUEUE + 10; + scsi_change_queue_depth(sdev, qdepth); + + if (SDEBUG_OPT_Q_NOISE & sdebug_opts) { + sdev_printk(KERN_INFO, sdev, "%s: qdepth=%d, num_in_q=%d\n", + __func__, qdepth, num_in_q); + } + block_unblock_all_queues(false); + return sdev->queue_depth; +} + +static bool fake_timeout(struct scsi_cmnd *scp) +{ + if (0 == (atomic_read(&sdebug_cmnd_count) % abs(sdebug_every_nth))) { + if (sdebug_every_nth < -1) + sdebug_every_nth = -1; + if (SDEBUG_OPT_TIMEOUT & sdebug_opts) + return true; /* ignore command causing timeout */ + else if (SDEBUG_OPT_MAC_TIMEOUT & sdebug_opts && + scsi_medium_access_command(scp)) + return true; /* time out reads and writes */ + } + return false; +} + +static bool fake_host_busy(struct scsi_cmnd *scp) +{ + return (sdebug_opts & SDEBUG_OPT_HOST_BUSY) && + (atomic_read(&sdebug_cmnd_count) % abs(sdebug_every_nth)) == 0; +} + +static int scsi_debug_queuecommand(struct Scsi_Host *shost, + struct scsi_cmnd *scp) +{ + u8 sdeb_i; + struct scsi_device *sdp = scp->device; + const struct opcode_info_t *oip; + const struct opcode_info_t *r_oip; + struct sdebug_dev_info *devip; + u8 *cmd = scp->cmnd; + int (*r_pfp)(struct scsi_cmnd *, struct sdebug_dev_info *); + int (*pfp)(struct scsi_cmnd *, struct sdebug_dev_info *) = NULL; + int k, na; + int errsts = 0; + u32 flags; + u16 sa; + u8 opcode = cmd[0]; + bool has_wlun_rl; + + scsi_set_resid(scp, 0); + if (sdebug_statistics) + atomic_inc(&sdebug_cmnd_count); + if (unlikely(sdebug_verbose && + !(SDEBUG_OPT_NO_CDB_NOISE & sdebug_opts))) { + char b[120]; + int n, len, sb; + + len = scp->cmd_len; + sb = (int)sizeof(b); + if (len > 32) + strcpy(b, "too long, over 32 bytes"); + else { + for (k = 0, n = 0; k < len && n < sb; ++k) + n += scnprintf(b + n, sb - n, "%02x ", + (u32)cmd[k]); + } + sdev_printk(KERN_INFO, sdp, "%s: tag=%#x, cmd %s\n", my_name, + blk_mq_unique_tag(scp->request), b); + } + if (fake_host_busy(scp)) + return SCSI_MLQUEUE_HOST_BUSY; + has_wlun_rl = (sdp->lun == SCSI_W_LUN_REPORT_LUNS); + if (unlikely((sdp->lun >= sdebug_max_luns) && !has_wlun_rl)) + goto err_out; + + sdeb_i = opcode_ind_arr[opcode]; /* fully mapped */ + oip = &opcode_info_arr[sdeb_i]; /* safe if table consistent */ + devip = (struct sdebug_dev_info *)sdp->hostdata; + if (unlikely(!devip)) { + devip = find_build_dev_info(sdp); + if (NULL == devip) + goto err_out; + } + na = oip->num_attached; + r_pfp = oip->pfp; + if (na) { /* multiple commands with this opcode */ + r_oip = oip; + if (FF_SA & r_oip->flags) { + if (F_SA_LOW & oip->flags) + sa = 0x1f & cmd[1]; + else + sa = get_unaligned_be16(cmd + 8); + for (k = 0; k <= na; oip = r_oip->arrp + k++) { + if (opcode == oip->opcode && sa == oip->sa) + break; + } + } else { /* since no service action only check opcode */ + for (k = 0; k <= na; oip = r_oip->arrp + k++) { + if (opcode == oip->opcode) + break; + } + } + if (k > na) { + if (F_SA_LOW & r_oip->flags) + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 4); + else if (F_SA_HIGH & r_oip->flags) + mk_sense_invalid_fld(scp, SDEB_IN_CDB, 8, 7); + else + mk_sense_invalid_opcode(scp); + goto check_cond; + } + } /* else (when na==0) we assume the oip is a match */ + flags = oip->flags; + if (unlikely(F_INV_OP & flags)) { + mk_sense_invalid_opcode(scp); + goto check_cond; + } + if (unlikely(has_wlun_rl && !(F_RL_WLUN_OK & flags))) { + if (sdebug_verbose) + sdev_printk(KERN_INFO, sdp, "%s: Opcode 0x%x not%s\n", + my_name, opcode, " supported for wlun"); + mk_sense_invalid_opcode(scp); + goto check_cond; + } + if (unlikely(sdebug_strict)) { /* check cdb against mask */ + u8 rem; + int j; + + for (k = 1; k < oip->len_mask[0] && k < 16; ++k) { + rem = ~oip->len_mask[k] & cmd[k]; + if (rem) { + for (j = 7; j >= 0; --j, rem <<= 1) { + if (0x80 & rem) + break; + } + mk_sense_invalid_fld(scp, SDEB_IN_CDB, k, j); + goto check_cond; + } + } + } + if (unlikely(!(F_SKIP_UA & flags) && + find_first_bit(devip->uas_bm, + SDEBUG_NUM_UAS) != SDEBUG_NUM_UAS)) { + errsts = make_ua(scp, devip); + if (errsts) + goto check_cond; + } + if (unlikely((F_M_ACCESS & flags) && atomic_read(&devip->stopped))) { + mk_sense_buffer(scp, NOT_READY, LOGICAL_UNIT_NOT_READY, 0x2); + if (sdebug_verbose) + sdev_printk(KERN_INFO, sdp, "%s reports: Not ready: " + "%s\n", my_name, "initializing command " + "required"); + errsts = check_condition_result; + goto fini; + } + if (sdebug_fake_rw && (F_FAKE_RW & flags)) + goto fini; + if (unlikely(sdebug_every_nth)) { + if (fake_timeout(scp)) + return 0; /* ignore command: make trouble */ + } + if (likely(oip->pfp)) + pfp = oip->pfp; /* calls a resp_* function */ + else + pfp = r_pfp; /* if leaf function ptr NULL, try the root's */ + +fini: + if (F_DELAY_OVERR & flags) + return schedule_resp(scp, devip, errsts, pfp, 0, 0); + else if ((flags & F_LONG_DELAY) && (sdebug_jdelay > 0 || + sdebug_ndelay > 10000)) { + /* + * Skip long delays if ndelay <= 10 microseconds. Otherwise + * for Start Stop Unit (SSU) want at least 1 second delay and + * if sdebug_jdelay>1 want a long delay of that many seconds. + * For Synchronize Cache want 1/20 of SSU's delay. + */ + int jdelay = (sdebug_jdelay < 2) ? 1 : sdebug_jdelay; + int denom = (flags & F_SYNC_DELAY) ? 20 : 1; + + jdelay = mult_frac(USER_HZ * jdelay, HZ, denom * USER_HZ); + return schedule_resp(scp, devip, errsts, pfp, jdelay, 0); + } else + return schedule_resp(scp, devip, errsts, pfp, sdebug_jdelay, + sdebug_ndelay); +check_cond: + return schedule_resp(scp, devip, check_condition_result, NULL, 0, 0); +err_out: + return schedule_resp(scp, NULL, DID_NO_CONNECT << 16, NULL, 0, 0); +} + +static struct scsi_host_template sdebug_driver_template = { + .show_info = scsi_debug_show_info, + .write_info = scsi_debug_write_info, + .proc_name = sdebug_proc_name, + .name = "SCSI DEBUG", + .info = scsi_debug_info, + .slave_alloc = scsi_debug_slave_alloc, + .slave_configure = scsi_debug_slave_configure, + .slave_destroy = scsi_debug_slave_destroy, + .ioctl = scsi_debug_ioctl, + .queuecommand = scsi_debug_queuecommand, + .change_queue_depth = sdebug_change_qdepth, + .eh_abort_handler = scsi_debug_abort, + .eh_device_reset_handler = scsi_debug_device_reset, + .eh_target_reset_handler = scsi_debug_target_reset, + .eh_bus_reset_handler = scsi_debug_bus_reset, + .eh_host_reset_handler = scsi_debug_host_reset, + .can_queue = SDEBUG_CANQUEUE, + .this_id = 7, + .sg_tablesize = SG_MAX_SEGMENTS, + .cmd_per_lun = DEF_CMD_PER_LUN, + .max_sectors = -1U, + .use_clustering = DISABLE_CLUSTERING, + .module = THIS_MODULE, + .track_queue_depth = 1, +}; + +static int sdebug_driver_probe(struct device *dev) +{ + int error = 0; + struct sdebug_host_info *sdbg_host; + struct Scsi_Host *hpnt; + int hprot; + + sdbg_host = to_sdebug_host(dev); + + sdebug_driver_template.can_queue = sdebug_max_queue; + if (sdebug_clustering) + sdebug_driver_template.use_clustering = ENABLE_CLUSTERING; + hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host)); + if (NULL == hpnt) { + pr_err("scsi_host_alloc failed\n"); + error = -ENODEV; + return error; + } + if (submit_queues > nr_cpu_ids) { + pr_warn("%s: trim submit_queues (was %d) to nr_cpu_ids=%u\n", + my_name, submit_queues, nr_cpu_ids); + submit_queues = nr_cpu_ids; + } + /* Decide whether to tell scsi subsystem that we want mq */ + /* Following should give the same answer for each host */ + if (shost_use_blk_mq(hpnt)) + hpnt->nr_hw_queues = submit_queues; + + sdbg_host->shost = hpnt; + *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host; + if ((hpnt->this_id >= 0) && (sdebug_num_tgts > hpnt->this_id)) + hpnt->max_id = sdebug_num_tgts + 1; + else + hpnt->max_id = sdebug_num_tgts; + /* = sdebug_max_luns; */ + hpnt->max_lun = SCSI_W_LUN_REPORT_LUNS + 1; + + hprot = 0; + + switch (sdebug_dif) { + + case T10_PI_TYPE1_PROTECTION: + hprot = SHOST_DIF_TYPE1_PROTECTION; + if (sdebug_dix) + hprot |= SHOST_DIX_TYPE1_PROTECTION; + break; + + case T10_PI_TYPE2_PROTECTION: + hprot = SHOST_DIF_TYPE2_PROTECTION; + if (sdebug_dix) + hprot |= SHOST_DIX_TYPE2_PROTECTION; + break; + + case T10_PI_TYPE3_PROTECTION: + hprot = SHOST_DIF_TYPE3_PROTECTION; + if (sdebug_dix) + hprot |= SHOST_DIX_TYPE3_PROTECTION; + break; + + default: + if (sdebug_dix) + hprot |= SHOST_DIX_TYPE0_PROTECTION; + break; + } + + scsi_host_set_prot(hpnt, hprot); + + if (have_dif_prot || sdebug_dix) + pr_info("host protection%s%s%s%s%s%s%s\n", + (hprot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "", + (hprot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "", + (hprot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "", + (hprot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "", + (hprot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "", + (hprot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "", + (hprot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : ""); + + if (sdebug_guard == 1) + scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP); + else + scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC); + + sdebug_verbose = !!(SDEBUG_OPT_NOISE & sdebug_opts); + sdebug_any_injecting_opt = !!(SDEBUG_OPT_ALL_INJECTING & sdebug_opts); + if (sdebug_every_nth) /* need stats counters for every_nth */ + sdebug_statistics = true; + error = scsi_add_host(hpnt, &sdbg_host->dev); + if (error) { + pr_err("scsi_add_host failed\n"); + error = -ENODEV; + scsi_host_put(hpnt); + } else + scsi_scan_host(hpnt); + + return error; +} + +static int sdebug_driver_remove(struct device *dev) +{ + struct sdebug_host_info *sdbg_host; + struct sdebug_dev_info *sdbg_devinfo, *tmp; + + sdbg_host = to_sdebug_host(dev); + + if (!sdbg_host) { + pr_err("Unable to locate host info\n"); + return -ENODEV; + } + + scsi_remove_host(sdbg_host->shost); + + list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list, + dev_list) { + list_del(&sdbg_devinfo->dev_list); + kfree(sdbg_devinfo); + } + + scsi_host_put(sdbg_host->shost); + return 0; +} + +static int pseudo_lld_bus_match(struct device *dev, + struct device_driver *dev_driver) +{ + return 1; +} + +static struct bus_type pseudo_lld_bus = { + .name = "pseudo", + .match = pseudo_lld_bus_match, + .probe = sdebug_driver_probe, + .remove = sdebug_driver_remove, + .drv_groups = sdebug_drv_groups, +}; |