diff options
Diffstat (limited to 'drivers/block/skd_main.c')
| -rw-r--r-- | drivers/block/skd_main.c | 3677 |
1 files changed, 3677 insertions, 0 deletions
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c new file mode 100644 index 000000000..80a5806ed --- /dev/null +++ b/drivers/block/skd_main.c @@ -0,0 +1,3677 @@ +/* + * Driver for sTec s1120 PCIe SSDs. sTec was acquired in 2013 by HGST and HGST + * was acquired by Western Digital in 2012. + * + * Copyright 2012 sTec, Inc. + * Copyright (c) 2017 Western Digital Corporation or its affiliates. + * + * This file is part of the Linux kernel, and is made available under + * the terms of the GNU General Public License version 2. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/blkdev.h> +#include <linux/blk-mq.h> +#include <linux/sched.h> +#include <linux/interrupt.h> +#include <linux/compiler.h> +#include <linux/workqueue.h> +#include <linux/delay.h> +#include <linux/time.h> +#include <linux/hdreg.h> +#include <linux/dma-mapping.h> +#include <linux/completion.h> +#include <linux/scatterlist.h> +#include <linux/version.h> +#include <linux/err.h> +#include <linux/aer.h> +#include <linux/wait.h> +#include <linux/stringify.h> +#include <scsi/scsi.h> +#include <scsi/sg.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <asm/unaligned.h> + +#include "skd_s1120.h" + +static int skd_dbg_level; +static int skd_isr_comp_limit = 4; + +#define SKD_ASSERT(expr) \ + do { \ + if (unlikely(!(expr))) { \ + pr_err("Assertion failed! %s,%s,%s,line=%d\n", \ + # expr, __FILE__, __func__, __LINE__); \ + } \ + } while (0) + +#define DRV_NAME "skd" +#define PFX DRV_NAME ": " + +MODULE_LICENSE("GPL"); + +MODULE_DESCRIPTION("STEC s1120 PCIe SSD block driver"); + +#define PCI_VENDOR_ID_STEC 0x1B39 +#define PCI_DEVICE_ID_S1120 0x0001 + +#define SKD_FUA_NV (1 << 1) +#define SKD_MINORS_PER_DEVICE 16 + +#define SKD_MAX_QUEUE_DEPTH 200u + +#define SKD_PAUSE_TIMEOUT (5 * 1000) + +#define SKD_N_FITMSG_BYTES (512u) +#define SKD_MAX_REQ_PER_MSG 14 + +#define SKD_N_SPECIAL_FITMSG_BYTES (128u) + +/* SG elements are 32 bytes, so we can make this 4096 and still be under the + * 128KB limit. That allows 4096*4K = 16M xfer size + */ +#define SKD_N_SG_PER_REQ_DEFAULT 256u + +#define SKD_N_COMPLETION_ENTRY 256u +#define SKD_N_READ_CAP_BYTES (8u) + +#define SKD_N_INTERNAL_BYTES (512u) + +#define SKD_SKCOMP_SIZE \ + ((sizeof(struct fit_completion_entry_v1) + \ + sizeof(struct fit_comp_error_info)) * SKD_N_COMPLETION_ENTRY) + +/* 5 bits of uniqifier, 0xF800 */ +#define SKD_ID_TABLE_MASK (3u << 8u) +#define SKD_ID_RW_REQUEST (0u << 8u) +#define SKD_ID_INTERNAL (1u << 8u) +#define SKD_ID_FIT_MSG (3u << 8u) +#define SKD_ID_SLOT_MASK 0x00FFu +#define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu + +#define SKD_N_MAX_SECTORS 2048u + +#define SKD_MAX_RETRIES 2u + +#define SKD_TIMER_SECONDS(seconds) (seconds) +#define SKD_TIMER_MINUTES(minutes) ((minutes) * (60)) + +#define INQ_STD_NBYTES 36 + +enum skd_drvr_state { + SKD_DRVR_STATE_LOAD, + SKD_DRVR_STATE_IDLE, + SKD_DRVR_STATE_BUSY, + SKD_DRVR_STATE_STARTING, + SKD_DRVR_STATE_ONLINE, + SKD_DRVR_STATE_PAUSING, + SKD_DRVR_STATE_PAUSED, + SKD_DRVR_STATE_RESTARTING, + SKD_DRVR_STATE_RESUMING, + SKD_DRVR_STATE_STOPPING, + SKD_DRVR_STATE_FAULT, + SKD_DRVR_STATE_DISAPPEARED, + SKD_DRVR_STATE_PROTOCOL_MISMATCH, + SKD_DRVR_STATE_BUSY_ERASE, + SKD_DRVR_STATE_BUSY_SANITIZE, + SKD_DRVR_STATE_BUSY_IMMINENT, + SKD_DRVR_STATE_WAIT_BOOT, + SKD_DRVR_STATE_SYNCING, +}; + +#define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u) +#define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u) +#define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u) +#define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u) +#define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u) +#define SKD_START_WAIT_SECONDS 90u + +enum skd_req_state { + SKD_REQ_STATE_IDLE, + SKD_REQ_STATE_SETUP, + SKD_REQ_STATE_BUSY, + SKD_REQ_STATE_COMPLETED, + SKD_REQ_STATE_TIMEOUT, +}; + +enum skd_check_status_action { + SKD_CHECK_STATUS_REPORT_GOOD, + SKD_CHECK_STATUS_REPORT_SMART_ALERT, + SKD_CHECK_STATUS_REQUEUE_REQUEST, + SKD_CHECK_STATUS_REPORT_ERROR, + SKD_CHECK_STATUS_BUSY_IMMINENT, +}; + +struct skd_msg_buf { + struct fit_msg_hdr fmh; + struct skd_scsi_request scsi[SKD_MAX_REQ_PER_MSG]; +}; + +struct skd_fitmsg_context { + u32 id; + + u32 length; + + struct skd_msg_buf *msg_buf; + dma_addr_t mb_dma_address; +}; + +struct skd_request_context { + enum skd_req_state state; + + u16 id; + u32 fitmsg_id; + + u8 flush_cmd; + + enum dma_data_direction data_dir; + struct scatterlist *sg; + u32 n_sg; + u32 sg_byte_count; + + struct fit_sg_descriptor *sksg_list; + dma_addr_t sksg_dma_address; + + struct fit_completion_entry_v1 completion; + + struct fit_comp_error_info err_info; + + blk_status_t status; +}; + +struct skd_special_context { + struct skd_request_context req; + + void *data_buf; + dma_addr_t db_dma_address; + + struct skd_msg_buf *msg_buf; + dma_addr_t mb_dma_address; +}; + +typedef enum skd_irq_type { + SKD_IRQ_LEGACY, + SKD_IRQ_MSI, + SKD_IRQ_MSIX +} skd_irq_type_t; + +#define SKD_MAX_BARS 2 + +struct skd_device { + void __iomem *mem_map[SKD_MAX_BARS]; + resource_size_t mem_phys[SKD_MAX_BARS]; + u32 mem_size[SKD_MAX_BARS]; + + struct skd_msix_entry *msix_entries; + + struct pci_dev *pdev; + int pcie_error_reporting_is_enabled; + + spinlock_t lock; + struct gendisk *disk; + struct blk_mq_tag_set tag_set; + struct request_queue *queue; + struct skd_fitmsg_context *skmsg; + struct device *class_dev; + int gendisk_on; + int sync_done; + + u32 devno; + u32 major; + char isr_name[30]; + + enum skd_drvr_state state; + u32 drive_state; + + u32 cur_max_queue_depth; + u32 queue_low_water_mark; + u32 dev_max_queue_depth; + + u32 num_fitmsg_context; + u32 num_req_context; + + struct skd_fitmsg_context *skmsg_table; + + struct skd_special_context internal_skspcl; + u32 read_cap_blocksize; + u32 read_cap_last_lba; + int read_cap_is_valid; + int inquiry_is_valid; + u8 inq_serial_num[13]; /*12 chars plus null term */ + + u8 skcomp_cycle; + u32 skcomp_ix; + struct kmem_cache *msgbuf_cache; + struct kmem_cache *sglist_cache; + struct kmem_cache *databuf_cache; + struct fit_completion_entry_v1 *skcomp_table; + struct fit_comp_error_info *skerr_table; + dma_addr_t cq_dma_address; + + wait_queue_head_t waitq; + + struct timer_list timer; + u32 timer_countdown; + u32 timer_substate; + + int sgs_per_request; + u32 last_mtd; + + u32 proto_ver; + + int dbg_level; + u32 connect_time_stamp; + int connect_retries; +#define SKD_MAX_CONNECT_RETRIES 16 + u32 drive_jiffies; + + u32 timo_slot; + + struct work_struct start_queue; + struct work_struct completion_worker; +}; + +#define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF) +#define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF) +#define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF) + +static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset) +{ + u32 val = readl(skdev->mem_map[1] + offset); + + if (unlikely(skdev->dbg_level >= 2)) + dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val); + return val; +} + +static inline void skd_reg_write32(struct skd_device *skdev, u32 val, + u32 offset) +{ + writel(val, skdev->mem_map[1] + offset); + if (unlikely(skdev->dbg_level >= 2)) + dev_dbg(&skdev->pdev->dev, "offset %x = %x\n", offset, val); +} + +static inline void skd_reg_write64(struct skd_device *skdev, u64 val, + u32 offset) +{ + writeq(val, skdev->mem_map[1] + offset); + if (unlikely(skdev->dbg_level >= 2)) + dev_dbg(&skdev->pdev->dev, "offset %x = %016llx\n", offset, + val); +} + + +#define SKD_IRQ_DEFAULT SKD_IRQ_MSIX +static int skd_isr_type = SKD_IRQ_DEFAULT; + +module_param(skd_isr_type, int, 0444); +MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability." + " (0==legacy, 1==MSI, 2==MSI-X, default==1)"); + +#define SKD_MAX_REQ_PER_MSG_DEFAULT 1 +static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT; + +module_param(skd_max_req_per_msg, int, 0444); +MODULE_PARM_DESC(skd_max_req_per_msg, + "Maximum SCSI requests packed in a single message." + " (1-" __stringify(SKD_MAX_REQ_PER_MSG) ", default==1)"); + +#define SKD_MAX_QUEUE_DEPTH_DEFAULT 64 +#define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64" +static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT; + +module_param(skd_max_queue_depth, int, 0444); +MODULE_PARM_DESC(skd_max_queue_depth, + "Maximum SCSI requests issued to s1120." + " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")"); + +static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT; +module_param(skd_sgs_per_request, int, 0444); +MODULE_PARM_DESC(skd_sgs_per_request, + "Maximum SG elements per block request." + " (1-4096, default==256)"); + +static int skd_max_pass_thru = 1; +module_param(skd_max_pass_thru, int, 0444); +MODULE_PARM_DESC(skd_max_pass_thru, + "Maximum SCSI pass-thru at a time. IGNORED"); + +module_param(skd_dbg_level, int, 0444); +MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)"); + +module_param(skd_isr_comp_limit, int, 0444); +MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4"); + +/* Major device number dynamically assigned. */ +static u32 skd_major; + +static void skd_destruct(struct skd_device *skdev); +static const struct block_device_operations skd_blockdev_ops; +static void skd_send_fitmsg(struct skd_device *skdev, + struct skd_fitmsg_context *skmsg); +static void skd_send_special_fitmsg(struct skd_device *skdev, + struct skd_special_context *skspcl); +static bool skd_preop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq); +static void skd_postop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq); + +static void skd_restart_device(struct skd_device *skdev); +static int skd_quiesce_dev(struct skd_device *skdev); +static int skd_unquiesce_dev(struct skd_device *skdev); +static void skd_disable_interrupts(struct skd_device *skdev); +static void skd_isr_fwstate(struct skd_device *skdev); +static void skd_recover_requests(struct skd_device *skdev); +static void skd_soft_reset(struct skd_device *skdev); + +const char *skd_drive_state_to_str(int state); +const char *skd_skdev_state_to_str(enum skd_drvr_state state); +static void skd_log_skdev(struct skd_device *skdev, const char *event); +static void skd_log_skreq(struct skd_device *skdev, + struct skd_request_context *skreq, const char *event); + +/* + ***************************************************************************** + * READ/WRITE REQUESTS + ***************************************************************************** + */ +static void skd_inc_in_flight(struct request *rq, void *data, bool reserved) +{ + int *count = data; + + count++; +} + +static int skd_in_flight(struct skd_device *skdev) +{ + int count = 0; + + blk_mq_tagset_busy_iter(&skdev->tag_set, skd_inc_in_flight, &count); + + return count; +} + +static void +skd_prep_rw_cdb(struct skd_scsi_request *scsi_req, + int data_dir, unsigned lba, + unsigned count) +{ + if (data_dir == READ) + scsi_req->cdb[0] = READ_10; + else + scsi_req->cdb[0] = WRITE_10; + + scsi_req->cdb[1] = 0; + scsi_req->cdb[2] = (lba & 0xff000000) >> 24; + scsi_req->cdb[3] = (lba & 0xff0000) >> 16; + scsi_req->cdb[4] = (lba & 0xff00) >> 8; + scsi_req->cdb[5] = (lba & 0xff); + scsi_req->cdb[6] = 0; + scsi_req->cdb[7] = (count & 0xff00) >> 8; + scsi_req->cdb[8] = count & 0xff; + scsi_req->cdb[9] = 0; +} + +static void +skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req, + struct skd_request_context *skreq) +{ + skreq->flush_cmd = 1; + + scsi_req->cdb[0] = SYNCHRONIZE_CACHE; + scsi_req->cdb[1] = 0; + scsi_req->cdb[2] = 0; + scsi_req->cdb[3] = 0; + scsi_req->cdb[4] = 0; + scsi_req->cdb[5] = 0; + scsi_req->cdb[6] = 0; + scsi_req->cdb[7] = 0; + scsi_req->cdb[8] = 0; + scsi_req->cdb[9] = 0; +} + +/* + * Return true if and only if all pending requests should be failed. + */ +static bool skd_fail_all(struct request_queue *q) +{ + struct skd_device *skdev = q->queuedata; + + SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE); + + skd_log_skdev(skdev, "req_not_online"); + switch (skdev->state) { + case SKD_DRVR_STATE_PAUSING: + case SKD_DRVR_STATE_PAUSED: + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + case SKD_DRVR_STATE_WAIT_BOOT: + /* In case of starting, we haven't started the queue, + * so we can't get here... but requests are + * possibly hanging out waiting for us because we + * reported the dev/skd0 already. They'll wait + * forever if connect doesn't complete. + * What to do??? delay dev/skd0 ?? + */ + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + case SKD_DRVR_STATE_BUSY_ERASE: + return false; + + case SKD_DRVR_STATE_BUSY_SANITIZE: + case SKD_DRVR_STATE_STOPPING: + case SKD_DRVR_STATE_SYNCING: + case SKD_DRVR_STATE_FAULT: + case SKD_DRVR_STATE_DISAPPEARED: + default: + return true; + } +} + +static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *mqd) +{ + struct request *const req = mqd->rq; + struct request_queue *const q = req->q; + struct skd_device *skdev = q->queuedata; + struct skd_fitmsg_context *skmsg; + struct fit_msg_hdr *fmh; + const u32 tag = blk_mq_unique_tag(req); + struct skd_request_context *const skreq = blk_mq_rq_to_pdu(req); + struct skd_scsi_request *scsi_req; + unsigned long flags = 0; + const u32 lba = blk_rq_pos(req); + const u32 count = blk_rq_sectors(req); + const int data_dir = rq_data_dir(req); + + if (unlikely(skdev->state != SKD_DRVR_STATE_ONLINE)) + return skd_fail_all(q) ? BLK_STS_IOERR : BLK_STS_RESOURCE; + + blk_mq_start_request(req); + + WARN_ONCE(tag >= skd_max_queue_depth, "%#x > %#x (nr_requests = %lu)\n", + tag, skd_max_queue_depth, q->nr_requests); + + SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE); + + dev_dbg(&skdev->pdev->dev, + "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, + lba, count, count, data_dir); + + skreq->id = tag + SKD_ID_RW_REQUEST; + skreq->flush_cmd = 0; + skreq->n_sg = 0; + skreq->sg_byte_count = 0; + + skreq->fitmsg_id = 0; + + skreq->data_dir = data_dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + if (req->bio && !skd_preop_sg_list(skdev, skreq)) { + dev_dbg(&skdev->pdev->dev, "error Out\n"); + skreq->status = BLK_STS_RESOURCE; + blk_mq_complete_request(req); + return BLK_STS_OK; + } + + dma_sync_single_for_device(&skdev->pdev->dev, skreq->sksg_dma_address, + skreq->n_sg * + sizeof(struct fit_sg_descriptor), + DMA_TO_DEVICE); + + /* Either a FIT msg is in progress or we have to start one. */ + if (skd_max_req_per_msg == 1) { + skmsg = NULL; + } else { + spin_lock_irqsave(&skdev->lock, flags); + skmsg = skdev->skmsg; + } + if (!skmsg) { + skmsg = &skdev->skmsg_table[tag]; + skdev->skmsg = skmsg; + + /* Initialize the FIT msg header */ + fmh = &skmsg->msg_buf->fmh; + memset(fmh, 0, sizeof(*fmh)); + fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT; + skmsg->length = sizeof(*fmh); + } else { + fmh = &skmsg->msg_buf->fmh; + } + + skreq->fitmsg_id = skmsg->id; + + scsi_req = &skmsg->msg_buf->scsi[fmh->num_protocol_cmds_coalesced]; + memset(scsi_req, 0, sizeof(*scsi_req)); + + scsi_req->hdr.tag = skreq->id; + scsi_req->hdr.sg_list_dma_address = + cpu_to_be64(skreq->sksg_dma_address); + + if (req_op(req) == REQ_OP_FLUSH) { + skd_prep_zerosize_flush_cdb(scsi_req, skreq); + SKD_ASSERT(skreq->flush_cmd == 1); + } else { + skd_prep_rw_cdb(scsi_req, data_dir, lba, count); + } + + if (req->cmd_flags & REQ_FUA) + scsi_req->cdb[1] |= SKD_FUA_NV; + + scsi_req->hdr.sg_list_len_bytes = cpu_to_be32(skreq->sg_byte_count); + + /* Complete resource allocations. */ + skreq->state = SKD_REQ_STATE_BUSY; + + skmsg->length += sizeof(struct skd_scsi_request); + fmh->num_protocol_cmds_coalesced++; + + dev_dbg(&skdev->pdev->dev, "req=0x%x busy=%d\n", skreq->id, + skd_in_flight(skdev)); + + /* + * If the FIT msg buffer is full send it. + */ + if (skd_max_req_per_msg == 1) { + skd_send_fitmsg(skdev, skmsg); + } else { + if (mqd->last || + fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) { + skd_send_fitmsg(skdev, skmsg); + skdev->skmsg = NULL; + } + spin_unlock_irqrestore(&skdev->lock, flags); + } + + return BLK_STS_OK; +} + +static enum blk_eh_timer_return skd_timed_out(struct request *req, + bool reserved) +{ + struct skd_device *skdev = req->q->queuedata; + + dev_err(&skdev->pdev->dev, "request with tag %#x timed out\n", + blk_mq_unique_tag(req)); + + return BLK_EH_RESET_TIMER; +} + +static void skd_complete_rq(struct request *req) +{ + struct skd_request_context *skreq = blk_mq_rq_to_pdu(req); + + blk_mq_end_request(req, skreq->status); +} + +static bool skd_preop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + struct request *req = blk_mq_rq_from_pdu(skreq); + struct scatterlist *sgl = &skreq->sg[0], *sg; + int n_sg; + int i; + + skreq->sg_byte_count = 0; + + WARN_ON_ONCE(skreq->data_dir != DMA_TO_DEVICE && + skreq->data_dir != DMA_FROM_DEVICE); + + n_sg = blk_rq_map_sg(skdev->queue, req, sgl); + if (n_sg <= 0) + return false; + + /* + * Map scatterlist to PCI bus addresses. + * Note PCI might change the number of entries. + */ + n_sg = pci_map_sg(skdev->pdev, sgl, n_sg, skreq->data_dir); + if (n_sg <= 0) + return false; + + SKD_ASSERT(n_sg <= skdev->sgs_per_request); + + skreq->n_sg = n_sg; + + for_each_sg(sgl, sg, n_sg, i) { + struct fit_sg_descriptor *sgd = &skreq->sksg_list[i]; + u32 cnt = sg_dma_len(sg); + uint64_t dma_addr = sg_dma_address(sg); + + sgd->control = FIT_SGD_CONTROL_NOT_LAST; + sgd->byte_count = cnt; + skreq->sg_byte_count += cnt; + sgd->host_side_addr = dma_addr; + sgd->dev_side_addr = 0; + } + + skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL; + skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST; + + if (unlikely(skdev->dbg_level > 1)) { + dev_dbg(&skdev->pdev->dev, + "skreq=%x sksg_list=%p sksg_dma=%pad\n", + skreq->id, skreq->sksg_list, &skreq->sksg_dma_address); + for (i = 0; i < n_sg; i++) { + struct fit_sg_descriptor *sgd = &skreq->sksg_list[i]; + + dev_dbg(&skdev->pdev->dev, + " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n", + i, sgd->byte_count, sgd->control, + sgd->host_side_addr, sgd->next_desc_ptr); + } + } + + return true; +} + +static void skd_postop_sg_list(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + /* + * restore the next ptr for next IO request so we + * don't have to set it every time. + */ + skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr = + skreq->sksg_dma_address + + ((skreq->n_sg) * sizeof(struct fit_sg_descriptor)); + pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, skreq->data_dir); +} + +/* + ***************************************************************************** + * TIMER + ***************************************************************************** + */ + +static void skd_timer_tick_not_online(struct skd_device *skdev); + +static void skd_start_queue(struct work_struct *work) +{ + struct skd_device *skdev = container_of(work, typeof(*skdev), + start_queue); + + /* + * Although it is safe to call blk_start_queue() from interrupt + * context, blk_mq_start_hw_queues() must not be called from + * interrupt context. + */ + blk_mq_start_hw_queues(skdev->queue); +} + +static void skd_timer_tick(struct timer_list *t) +{ + struct skd_device *skdev = from_timer(skdev, t, timer); + unsigned long reqflags; + u32 state; + + if (skdev->state == SKD_DRVR_STATE_FAULT) + /* The driver has declared fault, and we want it to + * stay that way until driver is reloaded. + */ + return; + + spin_lock_irqsave(&skdev->lock, reqflags); + + state = SKD_READL(skdev, FIT_STATUS); + state &= FIT_SR_DRIVE_STATE_MASK; + if (state != skdev->drive_state) + skd_isr_fwstate(skdev); + + if (skdev->state != SKD_DRVR_STATE_ONLINE) + skd_timer_tick_not_online(skdev); + + mod_timer(&skdev->timer, (jiffies + HZ)); + + spin_unlock_irqrestore(&skdev->lock, reqflags); +} + +static void skd_timer_tick_not_online(struct skd_device *skdev) +{ + switch (skdev->state) { + case SKD_DRVR_STATE_IDLE: + case SKD_DRVR_STATE_LOAD: + break; + case SKD_DRVR_STATE_BUSY_SANITIZE: + dev_dbg(&skdev->pdev->dev, + "drive busy sanitize[%x], driver[%x]\n", + skdev->drive_state, skdev->state); + /* If we've been in sanitize for 3 seconds, we figure we're not + * going to get anymore completions, so recover requests now + */ + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + skd_recover_requests(skdev); + break; + + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + case SKD_DRVR_STATE_BUSY_ERASE: + dev_dbg(&skdev->pdev->dev, "busy[%x], countdown=%d\n", + skdev->state, skdev->timer_countdown); + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + dev_dbg(&skdev->pdev->dev, + "busy[%x], timedout=%d, restarting device.", + skdev->state, skdev->timer_countdown); + skd_restart_device(skdev); + break; + + case SKD_DRVR_STATE_WAIT_BOOT: + case SKD_DRVR_STATE_STARTING: + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + /* For now, we fault the drive. Could attempt resets to + * revcover at some point. */ + skdev->state = SKD_DRVR_STATE_FAULT; + + dev_err(&skdev->pdev->dev, "DriveFault Connect Timeout (%x)\n", + skdev->drive_state); + + /*start the queue so we can respond with error to requests */ + /* wakeup anyone waiting for startup complete */ + schedule_work(&skdev->start_queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + case SKD_DRVR_STATE_ONLINE: + /* shouldn't get here. */ + break; + + case SKD_DRVR_STATE_PAUSING: + case SKD_DRVR_STATE_PAUSED: + break; + + case SKD_DRVR_STATE_RESTARTING: + if (skdev->timer_countdown > 0) { + skdev->timer_countdown--; + return; + } + /* For now, we fault the drive. Could attempt resets to + * revcover at some point. */ + skdev->state = SKD_DRVR_STATE_FAULT; + dev_err(&skdev->pdev->dev, + "DriveFault Reconnect Timeout (%x)\n", + skdev->drive_state); + + /* + * Recovering does two things: + * 1. completes IO with error + * 2. reclaims dma resources + * When is it safe to recover requests? + * - if the drive state is faulted + * - if the state is still soft reset after out timeout + * - if the drive registers are dead (state = FF) + * If it is "unsafe", we still need to recover, so we will + * disable pci bus mastering and disable our interrupts. + */ + + if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) || + (skdev->drive_state == FIT_SR_DRIVE_FAULT) || + (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK)) + /* It never came out of soft reset. Try to + * recover the requests and then let them + * fail. This is to mitigate hung processes. */ + skd_recover_requests(skdev); + else { + dev_err(&skdev->pdev->dev, "Disable BusMaster (%x)\n", + skdev->drive_state); + pci_disable_device(skdev->pdev); + skd_disable_interrupts(skdev); + skd_recover_requests(skdev); + } + + /*start the queue so we can respond with error to requests */ + /* wakeup anyone waiting for startup complete */ + schedule_work(&skdev->start_queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + case SKD_DRVR_STATE_RESUMING: + case SKD_DRVR_STATE_STOPPING: + case SKD_DRVR_STATE_SYNCING: + case SKD_DRVR_STATE_FAULT: + case SKD_DRVR_STATE_DISAPPEARED: + default: + break; + } +} + +static int skd_start_timer(struct skd_device *skdev) +{ + int rc; + + timer_setup(&skdev->timer, skd_timer_tick, 0); + + rc = mod_timer(&skdev->timer, (jiffies + HZ)); + if (rc) + dev_err(&skdev->pdev->dev, "failed to start timer %d\n", rc); + return rc; +} + +static void skd_kill_timer(struct skd_device *skdev) +{ + del_timer_sync(&skdev->timer); +} + +/* + ***************************************************************************** + * INTERNAL REQUESTS -- generated by driver itself + ***************************************************************************** + */ + +static int skd_format_internal_skspcl(struct skd_device *skdev) +{ + struct skd_special_context *skspcl = &skdev->internal_skspcl; + struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0]; + struct fit_msg_hdr *fmh; + uint64_t dma_address; + struct skd_scsi_request *scsi; + + fmh = &skspcl->msg_buf->fmh; + fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT; + fmh->num_protocol_cmds_coalesced = 1; + + scsi = &skspcl->msg_buf->scsi[0]; + memset(scsi, 0, sizeof(*scsi)); + dma_address = skspcl->req.sksg_dma_address; + scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address); + skspcl->req.n_sg = 1; + sgd->control = FIT_SGD_CONTROL_LAST; + sgd->byte_count = 0; + sgd->host_side_addr = skspcl->db_dma_address; + sgd->dev_side_addr = 0; + sgd->next_desc_ptr = 0LL; + + return 1; +} + +#define WR_BUF_SIZE SKD_N_INTERNAL_BYTES + +static void skd_send_internal_skspcl(struct skd_device *skdev, + struct skd_special_context *skspcl, + u8 opcode) +{ + struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0]; + struct skd_scsi_request *scsi; + unsigned char *buf = skspcl->data_buf; + int i; + + if (skspcl->req.state != SKD_REQ_STATE_IDLE) + /* + * A refresh is already in progress. + * Just wait for it to finish. + */ + return; + + skspcl->req.state = SKD_REQ_STATE_BUSY; + + scsi = &skspcl->msg_buf->scsi[0]; + scsi->hdr.tag = skspcl->req.id; + + memset(scsi->cdb, 0, sizeof(scsi->cdb)); + + switch (opcode) { + case TEST_UNIT_READY: + scsi->cdb[0] = TEST_UNIT_READY; + sgd->byte_count = 0; + scsi->hdr.sg_list_len_bytes = 0; + break; + + case READ_CAPACITY: + scsi->cdb[0] = READ_CAPACITY; + sgd->byte_count = SKD_N_READ_CAP_BYTES; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + break; + + case INQUIRY: + scsi->cdb[0] = INQUIRY; + scsi->cdb[1] = 0x01; /* evpd */ + scsi->cdb[2] = 0x80; /* serial number page */ + scsi->cdb[4] = 0x10; + sgd->byte_count = 16; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + break; + + case SYNCHRONIZE_CACHE: + scsi->cdb[0] = SYNCHRONIZE_CACHE; + sgd->byte_count = 0; + scsi->hdr.sg_list_len_bytes = 0; + break; + + case WRITE_BUFFER: + scsi->cdb[0] = WRITE_BUFFER; + scsi->cdb[1] = 0x02; + scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8; + scsi->cdb[8] = WR_BUF_SIZE & 0xFF; + sgd->byte_count = WR_BUF_SIZE; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + /* fill incrementing byte pattern */ + for (i = 0; i < sgd->byte_count; i++) + buf[i] = i & 0xFF; + break; + + case READ_BUFFER: + scsi->cdb[0] = READ_BUFFER; + scsi->cdb[1] = 0x02; + scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8; + scsi->cdb[8] = WR_BUF_SIZE & 0xFF; + sgd->byte_count = WR_BUF_SIZE; + scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count); + memset(skspcl->data_buf, 0, sgd->byte_count); + break; + + default: + SKD_ASSERT("Don't know what to send"); + return; + + } + skd_send_special_fitmsg(skdev, skspcl); +} + +static void skd_refresh_device_data(struct skd_device *skdev) +{ + struct skd_special_context *skspcl = &skdev->internal_skspcl; + + skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY); +} + +static int skd_chk_read_buf(struct skd_device *skdev, + struct skd_special_context *skspcl) +{ + unsigned char *buf = skspcl->data_buf; + int i; + + /* check for incrementing byte pattern */ + for (i = 0; i < WR_BUF_SIZE; i++) + if (buf[i] != (i & 0xFF)) + return 1; + + return 0; +} + +static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key, + u8 code, u8 qual, u8 fruc) +{ + /* If the check condition is of special interest, log a message */ + if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02) + && (code == 0x04) && (qual == 0x06)) { + dev_err(&skdev->pdev->dev, + "*** LOST_WRITE_DATA ERROR *** key/asc/ascq/fruc %02x/%02x/%02x/%02x\n", + key, code, qual, fruc); + } +} + +static void skd_complete_internal(struct skd_device *skdev, + struct fit_completion_entry_v1 *skcomp, + struct fit_comp_error_info *skerr, + struct skd_special_context *skspcl) +{ + u8 *buf = skspcl->data_buf; + u8 status; + int i; + struct skd_scsi_request *scsi = &skspcl->msg_buf->scsi[0]; + + lockdep_assert_held(&skdev->lock); + + SKD_ASSERT(skspcl == &skdev->internal_skspcl); + + dev_dbg(&skdev->pdev->dev, "complete internal %x\n", scsi->cdb[0]); + + dma_sync_single_for_cpu(&skdev->pdev->dev, + skspcl->db_dma_address, + skspcl->req.sksg_list[0].byte_count, + DMA_BIDIRECTIONAL); + + skspcl->req.completion = *skcomp; + skspcl->req.state = SKD_REQ_STATE_IDLE; + + status = skspcl->req.completion.status; + + skd_log_check_status(skdev, status, skerr->key, skerr->code, + skerr->qual, skerr->fruc); + + switch (scsi->cdb[0]) { + case TEST_UNIT_READY: + if (status == SAM_STAT_GOOD) + skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER); + else if ((status == SAM_STAT_CHECK_CONDITION) && + (skerr->key == MEDIUM_ERROR)) + skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER); + else { + if (skdev->state == SKD_DRVR_STATE_STOPPING) { + dev_dbg(&skdev->pdev->dev, + "TUR failed, don't send anymore state 0x%x\n", + skdev->state); + return; + } + dev_dbg(&skdev->pdev->dev, + "**** TUR failed, retry skerr\n"); + skd_send_internal_skspcl(skdev, skspcl, + TEST_UNIT_READY); + } + break; + + case WRITE_BUFFER: + if (status == SAM_STAT_GOOD) + skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER); + else { + if (skdev->state == SKD_DRVR_STATE_STOPPING) { + dev_dbg(&skdev->pdev->dev, + "write buffer failed, don't send anymore state 0x%x\n", + skdev->state); + return; + } + dev_dbg(&skdev->pdev->dev, + "**** write buffer failed, retry skerr\n"); + skd_send_internal_skspcl(skdev, skspcl, + TEST_UNIT_READY); + } + break; + + case READ_BUFFER: + if (status == SAM_STAT_GOOD) { + if (skd_chk_read_buf(skdev, skspcl) == 0) + skd_send_internal_skspcl(skdev, skspcl, + READ_CAPACITY); + else { + dev_err(&skdev->pdev->dev, + "*** W/R Buffer mismatch %d ***\n", + skdev->connect_retries); + if (skdev->connect_retries < + SKD_MAX_CONNECT_RETRIES) { + skdev->connect_retries++; + skd_soft_reset(skdev); + } else { + dev_err(&skdev->pdev->dev, + "W/R Buffer Connect Error\n"); + return; + } + } + + } else { + if (skdev->state == SKD_DRVR_STATE_STOPPING) { + dev_dbg(&skdev->pdev->dev, + "read buffer failed, don't send anymore state 0x%x\n", + skdev->state); + return; + } + dev_dbg(&skdev->pdev->dev, + "**** read buffer failed, retry skerr\n"); + skd_send_internal_skspcl(skdev, skspcl, + TEST_UNIT_READY); + } + break; + + case READ_CAPACITY: + skdev->read_cap_is_valid = 0; + if (status == SAM_STAT_GOOD) { + skdev->read_cap_last_lba = + (buf[0] << 24) | (buf[1] << 16) | + (buf[2] << 8) | buf[3]; + skdev->read_cap_blocksize = + (buf[4] << 24) | (buf[5] << 16) | + (buf[6] << 8) | buf[7]; + + dev_dbg(&skdev->pdev->dev, "last lba %d, bs %d\n", + skdev->read_cap_last_lba, + skdev->read_cap_blocksize); + + set_capacity(skdev->disk, skdev->read_cap_last_lba + 1); + + skdev->read_cap_is_valid = 1; + + skd_send_internal_skspcl(skdev, skspcl, INQUIRY); + } else if ((status == SAM_STAT_CHECK_CONDITION) && + (skerr->key == MEDIUM_ERROR)) { + skdev->read_cap_last_lba = ~0; + set_capacity(skdev->disk, skdev->read_cap_last_lba + 1); + dev_dbg(&skdev->pdev->dev, "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n"); + skd_send_internal_skspcl(skdev, skspcl, INQUIRY); + } else { + dev_dbg(&skdev->pdev->dev, "**** READCAP failed, retry TUR\n"); + skd_send_internal_skspcl(skdev, skspcl, + TEST_UNIT_READY); + } + break; + + case INQUIRY: + skdev->inquiry_is_valid = 0; + if (status == SAM_STAT_GOOD) { + skdev->inquiry_is_valid = 1; + + for (i = 0; i < 12; i++) + skdev->inq_serial_num[i] = buf[i + 4]; + skdev->inq_serial_num[12] = 0; + } + + if (skd_unquiesce_dev(skdev) < 0) + dev_dbg(&skdev->pdev->dev, "**** failed, to ONLINE device\n"); + /* connection is complete */ + skdev->connect_retries = 0; + break; + + case SYNCHRONIZE_CACHE: + if (status == SAM_STAT_GOOD) + skdev->sync_done = 1; + else + skdev->sync_done = -1; + wake_up_interruptible(&skdev->waitq); + break; + + default: + SKD_ASSERT("we didn't send this"); + } +} + +/* + ***************************************************************************** + * FIT MESSAGES + ***************************************************************************** + */ + +static void skd_send_fitmsg(struct skd_device *skdev, + struct skd_fitmsg_context *skmsg) +{ + u64 qcmd; + + dev_dbg(&skdev->pdev->dev, "dma address %pad, busy=%d\n", + &skmsg->mb_dma_address, skd_in_flight(skdev)); + dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf); + + qcmd = skmsg->mb_dma_address; + qcmd |= FIT_QCMD_QID_NORMAL; + + if (unlikely(skdev->dbg_level > 1)) { + u8 *bp = (u8 *)skmsg->msg_buf; + int i; + for (i = 0; i < skmsg->length; i += 8) { + dev_dbg(&skdev->pdev->dev, "msg[%2d] %8ph\n", i, + &bp[i]); + if (i == 0) + i = 64 - 8; + } + } + + if (skmsg->length > 256) + qcmd |= FIT_QCMD_MSGSIZE_512; + else if (skmsg->length > 128) + qcmd |= FIT_QCMD_MSGSIZE_256; + else if (skmsg->length > 64) + qcmd |= FIT_QCMD_MSGSIZE_128; + else + /* + * This makes no sense because the FIT msg header is + * 64 bytes. If the msg is only 64 bytes long it has + * no payload. + */ + qcmd |= FIT_QCMD_MSGSIZE_64; + + dma_sync_single_for_device(&skdev->pdev->dev, skmsg->mb_dma_address, + skmsg->length, DMA_TO_DEVICE); + + /* Make sure skd_msg_buf is written before the doorbell is triggered. */ + smp_wmb(); + + SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND); +} + +static void skd_send_special_fitmsg(struct skd_device *skdev, + struct skd_special_context *skspcl) +{ + u64 qcmd; + + WARN_ON_ONCE(skspcl->req.n_sg != 1); + + if (unlikely(skdev->dbg_level > 1)) { + u8 *bp = (u8 *)skspcl->msg_buf; + int i; + + for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) { + dev_dbg(&skdev->pdev->dev, " spcl[%2d] %8ph\n", i, + &bp[i]); + if (i == 0) + i = 64 - 8; + } + + dev_dbg(&skdev->pdev->dev, + "skspcl=%p id=%04x sksg_list=%p sksg_dma=%pad\n", + skspcl, skspcl->req.id, skspcl->req.sksg_list, + &skspcl->req.sksg_dma_address); + for (i = 0; i < skspcl->req.n_sg; i++) { + struct fit_sg_descriptor *sgd = + &skspcl->req.sksg_list[i]; + + dev_dbg(&skdev->pdev->dev, + " sg[%d] count=%u ctrl=0x%x addr=0x%llx next=0x%llx\n", + i, sgd->byte_count, sgd->control, + sgd->host_side_addr, sgd->next_desc_ptr); + } + } + + /* + * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr + * and one 64-byte SSDI command. + */ + qcmd = skspcl->mb_dma_address; + qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128; + + dma_sync_single_for_device(&skdev->pdev->dev, skspcl->mb_dma_address, + SKD_N_SPECIAL_FITMSG_BYTES, DMA_TO_DEVICE); + dma_sync_single_for_device(&skdev->pdev->dev, + skspcl->req.sksg_dma_address, + 1 * sizeof(struct fit_sg_descriptor), + DMA_TO_DEVICE); + dma_sync_single_for_device(&skdev->pdev->dev, + skspcl->db_dma_address, + skspcl->req.sksg_list[0].byte_count, + DMA_BIDIRECTIONAL); + + /* Make sure skd_msg_buf is written before the doorbell is triggered. */ + smp_wmb(); + + SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND); +} + +/* + ***************************************************************************** + * COMPLETION QUEUE + ***************************************************************************** + */ + +static void skd_complete_other(struct skd_device *skdev, + struct fit_completion_entry_v1 *skcomp, + struct fit_comp_error_info *skerr); + +struct sns_info { + u8 type; + u8 stat; + u8 key; + u8 asc; + u8 ascq; + u8 mask; + enum skd_check_status_action action; +}; + +static struct sns_info skd_chkstat_table[] = { + /* Good */ + { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c, + SKD_CHECK_STATUS_REPORT_GOOD }, + + /* Smart alerts */ + { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */ + SKD_CHECK_STATUS_REPORT_SMART_ALERT }, + { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */ + SKD_CHECK_STATUS_REPORT_SMART_ALERT }, + { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */ + SKD_CHECK_STATUS_REPORT_SMART_ALERT }, + + /* Retry (with limits) */ + { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */ + SKD_CHECK_STATUS_REQUEUE_REQUEST }, + + /* Busy (or about to be) */ + { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */ + SKD_CHECK_STATUS_BUSY_IMMINENT }, +}; + +/* + * Look up status and sense data to decide how to handle the error + * from the device. + * mask says which fields must match e.g., mask=0x18 means check + * type and stat, ignore key, asc, ascq. + */ + +static enum skd_check_status_action +skd_check_status(struct skd_device *skdev, + u8 cmp_status, struct fit_comp_error_info *skerr) +{ + int i; + + dev_err(&skdev->pdev->dev, "key/asc/ascq/fruc %02x/%02x/%02x/%02x\n", + skerr->key, skerr->code, skerr->qual, skerr->fruc); + + dev_dbg(&skdev->pdev->dev, + "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x fruc=%02x\n", + skerr->type, cmp_status, skerr->key, skerr->code, skerr->qual, + skerr->fruc); + + /* Does the info match an entry in the good category? */ + for (i = 0; i < ARRAY_SIZE(skd_chkstat_table); i++) { + struct sns_info *sns = &skd_chkstat_table[i]; + + if (sns->mask & 0x10) + if (skerr->type != sns->type) + continue; + + if (sns->mask & 0x08) + if (cmp_status != sns->stat) + continue; + + if (sns->mask & 0x04) + if (skerr->key != sns->key) + continue; + + if (sns->mask & 0x02) + if (skerr->code != sns->asc) + continue; + + if (sns->mask & 0x01) + if (skerr->qual != sns->ascq) + continue; + + if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) { + dev_err(&skdev->pdev->dev, + "SMART Alert: sense key/asc/ascq %02x/%02x/%02x\n", + skerr->key, skerr->code, skerr->qual); + } + return sns->action; + } + + /* No other match, so nonzero status means error, + * zero status means good + */ + if (cmp_status) { + dev_dbg(&skdev->pdev->dev, "status check: error\n"); + return SKD_CHECK_STATUS_REPORT_ERROR; + } + + dev_dbg(&skdev->pdev->dev, "status check good default\n"); + return SKD_CHECK_STATUS_REPORT_GOOD; +} + +static void skd_resolve_req_exception(struct skd_device *skdev, + struct skd_request_context *skreq, + struct request *req) +{ + u8 cmp_status = skreq->completion.status; + + switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) { + case SKD_CHECK_STATUS_REPORT_GOOD: + case SKD_CHECK_STATUS_REPORT_SMART_ALERT: + skreq->status = BLK_STS_OK; + blk_mq_complete_request(req); + break; + + case SKD_CHECK_STATUS_BUSY_IMMINENT: + skd_log_skreq(skdev, skreq, "retry(busy)"); + blk_mq_requeue_request(req, true); + dev_info(&skdev->pdev->dev, "drive BUSY imminent\n"); + skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT; + skdev->timer_countdown = SKD_TIMER_MINUTES(20); + skd_quiesce_dev(skdev); + break; + + case SKD_CHECK_STATUS_REQUEUE_REQUEST: + if ((unsigned long) ++req->special < SKD_MAX_RETRIES) { + skd_log_skreq(skdev, skreq, "retry"); + blk_mq_requeue_request(req, true); + break; + } + /* fall through */ + + case SKD_CHECK_STATUS_REPORT_ERROR: + default: + skreq->status = BLK_STS_IOERR; + blk_mq_complete_request(req); + break; + } +} + +static void skd_release_skreq(struct skd_device *skdev, + struct skd_request_context *skreq) +{ + /* + * Reclaim the skd_request_context + */ + skreq->state = SKD_REQ_STATE_IDLE; +} + +static int skd_isr_completion_posted(struct skd_device *skdev, + int limit, int *enqueued) +{ + struct fit_completion_entry_v1 *skcmp; + struct fit_comp_error_info *skerr; + u16 req_id; + u32 tag; + u16 hwq = 0; + struct request *rq; + struct skd_request_context *skreq; + u16 cmp_cntxt; + u8 cmp_status; + u8 cmp_cycle; + u32 cmp_bytes; + int rc = 0; + int processed = 0; + + lockdep_assert_held(&skdev->lock); + + for (;; ) { + SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY); + + skcmp = &skdev->skcomp_table[skdev->skcomp_ix]; + cmp_cycle = skcmp->cycle; + cmp_cntxt = skcmp->tag; + cmp_status = skcmp->status; + cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes); + + skerr = &skdev->skerr_table[skdev->skcomp_ix]; + + dev_dbg(&skdev->pdev->dev, + "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d busy=%d rbytes=0x%x proto=%d\n", + skdev->skcomp_cycle, skdev->skcomp_ix, cmp_cycle, + cmp_cntxt, cmp_status, skd_in_flight(skdev), + cmp_bytes, skdev->proto_ver); + + if (cmp_cycle != skdev->skcomp_cycle) { + dev_dbg(&skdev->pdev->dev, "end of completions\n"); + break; + } + /* + * Update the completion queue head index and possibly + * the completion cycle count. 8-bit wrap-around. + */ + skdev->skcomp_ix++; + if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) { + skdev->skcomp_ix = 0; + skdev->skcomp_cycle++; + } + + /* + * The command context is a unique 32-bit ID. The low order + * bits help locate the request. The request is usually a + * r/w request (see skd_start() above) or a special request. + */ + req_id = cmp_cntxt; + tag = req_id & SKD_ID_SLOT_AND_TABLE_MASK; + + /* Is this other than a r/w request? */ + if (tag >= skdev->num_req_context) { + /* + * This is not a completion for a r/w request. + */ + WARN_ON_ONCE(blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], + tag)); + skd_complete_other(skdev, skcmp, skerr); + continue; + } + + rq = blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], tag); + if (WARN(!rq, "No request for tag %#x -> %#x\n", cmp_cntxt, + tag)) + continue; + skreq = blk_mq_rq_to_pdu(rq); + + /* + * Make sure the request ID for the slot matches. + */ + if (skreq->id != req_id) { + dev_err(&skdev->pdev->dev, + "Completion mismatch comp_id=0x%04x skreq=0x%04x new=0x%04x\n", + req_id, skreq->id, cmp_cntxt); + + continue; + } + + SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY); + + skreq->completion = *skcmp; + if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) { + skreq->err_info = *skerr; + skd_log_check_status(skdev, cmp_status, skerr->key, + skerr->code, skerr->qual, + skerr->fruc); + } + /* Release DMA resources for the request. */ + if (skreq->n_sg > 0) + skd_postop_sg_list(skdev, skreq); + + skd_release_skreq(skdev, skreq); + + /* + * Capture the outcome and post it back to the native request. + */ + if (likely(cmp_status == SAM_STAT_GOOD)) { + skreq->status = BLK_STS_OK; + blk_mq_complete_request(rq); + } else { + skd_resolve_req_exception(skdev, skreq, rq); + } + + /* skd_isr_comp_limit equal zero means no limit */ + if (limit) { + if (++processed >= limit) { + rc = 1; + break; + } + } + } + + if (skdev->state == SKD_DRVR_STATE_PAUSING && + skd_in_flight(skdev) == 0) { + skdev->state = SKD_DRVR_STATE_PAUSED; + wake_up_interruptible(&skdev->waitq); + } + + return rc; +} + +static void skd_complete_other(struct skd_device *skdev, + struct fit_completion_entry_v1 *skcomp, + struct fit_comp_error_info *skerr) +{ + u32 req_id = 0; + u32 req_table; + u32 req_slot; + struct skd_special_context *skspcl; + + lockdep_assert_held(&skdev->lock); + + req_id = skcomp->tag; + req_table = req_id & SKD_ID_TABLE_MASK; + req_slot = req_id & SKD_ID_SLOT_MASK; + + dev_dbg(&skdev->pdev->dev, "table=0x%x id=0x%x slot=%d\n", req_table, + req_id, req_slot); + + /* + * Based on the request id, determine how to dispatch this completion. + * This swich/case is finding the good cases and forwarding the + * completion entry. Errors are reported below the switch. + */ + switch (req_table) { + case SKD_ID_RW_REQUEST: + /* + * The caller, skd_isr_completion_posted() above, + * handles r/w requests. The only way we get here + * is if the req_slot is out of bounds. + */ + break; + + case SKD_ID_INTERNAL: + if (req_slot == 0) { + skspcl = &skdev->internal_skspcl; + if (skspcl->req.id == req_id && + skspcl->req.state == SKD_REQ_STATE_BUSY) { + skd_complete_internal(skdev, + skcomp, skerr, skspcl); + return; + } + } + break; + + case SKD_ID_FIT_MSG: + /* + * These id's should never appear in a completion record. + */ + break; + + default: + /* + * These id's should never appear anywhere; + */ + break; + } + + /* + * If we get here it is a bad or stale id. + */ +} + +static void skd_reset_skcomp(struct skd_device *skdev) +{ + memset(skdev->skcomp_table, 0, SKD_SKCOMP_SIZE); + + skdev->skcomp_ix = 0; + skdev->skcomp_cycle = 1; +} + +/* + ***************************************************************************** + * INTERRUPTS + ***************************************************************************** + */ +static void skd_completion_worker(struct work_struct *work) +{ + struct skd_device *skdev = + container_of(work, struct skd_device, completion_worker); + unsigned long flags; + int flush_enqueued = 0; + + spin_lock_irqsave(&skdev->lock, flags); + + /* + * pass in limit=0, which means no limit.. + * process everything in compq + */ + skd_isr_completion_posted(skdev, 0, &flush_enqueued); + schedule_work(&skdev->start_queue); + + spin_unlock_irqrestore(&skdev->lock, flags); +} + +static void skd_isr_msg_from_dev(struct skd_device *skdev); + +static irqreturn_t +skd_isr(int irq, void *ptr) +{ + struct skd_device *skdev = ptr; + u32 intstat; + u32 ack; + int rc = 0; + int deferred = 0; + int flush_enqueued = 0; + + spin_lock(&skdev->lock); + + for (;; ) { + intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST); + + ack = FIT_INT_DEF_MASK; + ack &= intstat; + + dev_dbg(&skdev->pdev->dev, "intstat=0x%x ack=0x%x\n", intstat, + ack); + + /* As long as there is an int pending on device, keep + * running loop. When none, get out, but if we've never + * done any processing, call completion handler? + */ + if (ack == 0) { + /* No interrupts on device, but run the completion + * processor anyway? + */ + if (rc == 0) + if (likely (skdev->state + == SKD_DRVR_STATE_ONLINE)) + deferred = 1; + break; + } + + rc = IRQ_HANDLED; + + SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST); + + if (likely((skdev->state != SKD_DRVR_STATE_LOAD) && + (skdev->state != SKD_DRVR_STATE_STOPPING))) { + if (intstat & FIT_ISH_COMPLETION_POSTED) { + /* + * If we have already deferred completion + * processing, don't bother running it again + */ + if (deferred == 0) + deferred = + skd_isr_completion_posted(skdev, + skd_isr_comp_limit, &flush_enqueued); + } + + if (intstat & FIT_ISH_FW_STATE_CHANGE) { + skd_isr_fwstate(skdev); + if (skdev->state == SKD_DRVR_STATE_FAULT || + skdev->state == + SKD_DRVR_STATE_DISAPPEARED) { + spin_unlock(&skdev->lock); + return rc; + } + } + + if (intstat & FIT_ISH_MSG_FROM_DEV) + skd_isr_msg_from_dev(skdev); + } + } + + if (unlikely(flush_enqueued)) + schedule_work(&skdev->start_queue); + + if (deferred) + schedule_work(&skdev->completion_worker); + else if (!flush_enqueued) + schedule_work(&skdev->start_queue); + + spin_unlock(&skdev->lock); + + return rc; +} + +static void skd_drive_fault(struct skd_device *skdev) +{ + skdev->state = SKD_DRVR_STATE_FAULT; + dev_err(&skdev->pdev->dev, "Drive FAULT\n"); +} + +static void skd_drive_disappeared(struct skd_device *skdev) +{ + skdev->state = SKD_DRVR_STATE_DISAPPEARED; + dev_err(&skdev->pdev->dev, "Drive DISAPPEARED\n"); +} + +static void skd_isr_fwstate(struct skd_device *skdev) +{ + u32 sense; + u32 state; + u32 mtd; + int prev_driver_state = skdev->state; + + sense = SKD_READL(skdev, FIT_STATUS); + state = sense & FIT_SR_DRIVE_STATE_MASK; + + dev_err(&skdev->pdev->dev, "s1120 state %s(%d)=>%s(%d)\n", + skd_drive_state_to_str(skdev->drive_state), skdev->drive_state, + skd_drive_state_to_str(state), state); + + skdev->drive_state = state; + + switch (skdev->drive_state) { + case FIT_SR_DRIVE_INIT: + if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) { + skd_disable_interrupts(skdev); + break; + } + if (skdev->state == SKD_DRVR_STATE_RESTARTING) + skd_recover_requests(skdev); + if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) { + skdev->timer_countdown = SKD_STARTING_TIMO; + skdev->state = SKD_DRVR_STATE_STARTING; + skd_soft_reset(skdev); + break; + } + mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_SR_DRIVE_ONLINE: + skdev->cur_max_queue_depth = skd_max_queue_depth; + if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth) + skdev->cur_max_queue_depth = skdev->dev_max_queue_depth; + + skdev->queue_low_water_mark = + skdev->cur_max_queue_depth * 2 / 3 + 1; + if (skdev->queue_low_water_mark < 1) + skdev->queue_low_water_mark = 1; + dev_info(&skdev->pdev->dev, + "Queue depth limit=%d dev=%d lowat=%d\n", + skdev->cur_max_queue_depth, + skdev->dev_max_queue_depth, + skdev->queue_low_water_mark); + + skd_refresh_device_data(skdev); + break; + + case FIT_SR_DRIVE_BUSY: + skdev->state = SKD_DRVR_STATE_BUSY; + skdev->timer_countdown = SKD_BUSY_TIMO; + skd_quiesce_dev(skdev); + break; + case FIT_SR_DRIVE_BUSY_SANITIZE: + /* set timer for 3 seconds, we'll abort any unfinished + * commands after that expires + */ + skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE; + skdev->timer_countdown = SKD_TIMER_SECONDS(3); + schedule_work(&skdev->start_queue); + break; + case FIT_SR_DRIVE_BUSY_ERASE: + skdev->state = SKD_DRVR_STATE_BUSY_ERASE; + skdev->timer_countdown = SKD_BUSY_TIMO; + break; + case FIT_SR_DRIVE_OFFLINE: + skdev->state = SKD_DRVR_STATE_IDLE; + break; + case FIT_SR_DRIVE_SOFT_RESET: + switch (skdev->state) { + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + /* Expected by a caller of skd_soft_reset() */ + break; + default: + skdev->state = SKD_DRVR_STATE_RESTARTING; + break; + } + break; + case FIT_SR_DRIVE_FW_BOOTING: + dev_dbg(&skdev->pdev->dev, "ISR FIT_SR_DRIVE_FW_BOOTING\n"); + skdev->state = SKD_DRVR_STATE_WAIT_BOOT; + skdev->timer_countdown = SKD_WAIT_BOOT_TIMO; + break; + + case FIT_SR_DRIVE_DEGRADED: + case FIT_SR_PCIE_LINK_DOWN: + case FIT_SR_DRIVE_NEED_FW_DOWNLOAD: + break; + + case FIT_SR_DRIVE_FAULT: + skd_drive_fault(skdev); + skd_recover_requests(skdev); + schedule_work(&skdev->start_queue); + break; + + /* PCIe bus returned all Fs? */ + case 0xFF: + dev_info(&skdev->pdev->dev, "state=0x%x sense=0x%x\n", state, + sense); + skd_drive_disappeared(skdev); + skd_recover_requests(skdev); + schedule_work(&skdev->start_queue); + break; + default: + /* + * Uknown FW State. Wait for a state we recognize. + */ + break; + } + dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n", + skd_skdev_state_to_str(prev_driver_state), prev_driver_state, + skd_skdev_state_to_str(skdev->state), skdev->state); +} + +static void skd_recover_request(struct request *req, void *data, bool reserved) +{ + struct skd_device *const skdev = data; + struct skd_request_context *skreq = blk_mq_rq_to_pdu(req); + + if (skreq->state != SKD_REQ_STATE_BUSY) + return; + + skd_log_skreq(skdev, skreq, "recover"); + + /* Release DMA resources for the request. */ + if (skreq->n_sg > 0) + skd_postop_sg_list(skdev, skreq); + + skreq->state = SKD_REQ_STATE_IDLE; + skreq->status = BLK_STS_IOERR; + blk_mq_complete_request(req); +} + +static void skd_recover_requests(struct skd_device *skdev) +{ + blk_mq_tagset_busy_iter(&skdev->tag_set, skd_recover_request, skdev); +} + +static void skd_isr_msg_from_dev(struct skd_device *skdev) +{ + u32 mfd; + u32 mtd; + u32 data; + + mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE); + + dev_dbg(&skdev->pdev->dev, "mfd=0x%x last_mtd=0x%x\n", mfd, + skdev->last_mtd); + + /* ignore any mtd that is an ack for something we didn't send */ + if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd)) + return; + + switch (FIT_MXD_TYPE(mfd)) { + case FIT_MTD_FITFW_INIT: + skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd); + + if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) { + dev_err(&skdev->pdev->dev, "protocol mismatch\n"); + dev_err(&skdev->pdev->dev, " got=%d support=%d\n", + skdev->proto_ver, FIT_PROTOCOL_VERSION_1); + dev_err(&skdev->pdev->dev, " please upgrade driver\n"); + skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH; + skd_soft_reset(skdev); + break; + } + mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_GET_CMDQ_DEPTH: + skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd); + mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0, + SKD_N_COMPLETION_ENTRY); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_SET_COMPQ_DEPTH: + SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG); + mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_SET_COMPQ_ADDR: + skd_reset_skcomp(skdev); + mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_CMD_LOG_HOST_ID: + /* hardware interface overflows in y2106 */ + skdev->connect_time_stamp = (u32)ktime_get_real_seconds(); + data = skdev->connect_time_stamp & 0xFFFF; + mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_CMD_LOG_TIME_STAMP_LO: + skdev->drive_jiffies = FIT_MXD_DATA(mfd); + data = (skdev->connect_time_stamp >> 16) & 0xFFFF; + mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + break; + + case FIT_MTD_CMD_LOG_TIME_STAMP_HI: + skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16); + mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0); + SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); + skdev->last_mtd = mtd; + + dev_err(&skdev->pdev->dev, "Time sync driver=0x%x device=0x%x\n", + skdev->connect_time_stamp, skdev->drive_jiffies); + break; + + case FIT_MTD_ARM_QUEUE: + skdev->last_mtd = 0; + /* + * State should be, or soon will be, FIT_SR_DRIVE_ONLINE. + */ + break; + + default: + break; + } +} + +static void skd_disable_interrupts(struct skd_device *skdev) +{ + u32 sense; + + sense = SKD_READL(skdev, FIT_CONTROL); + sense &= ~FIT_CR_ENABLE_INTERRUPTS; + SKD_WRITEL(skdev, sense, FIT_CONTROL); + dev_dbg(&skdev->pdev->dev, "sense 0x%x\n", sense); + + /* Note that the 1s is written. A 1-bit means + * disable, a 0 means enable. + */ + SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST); +} + +static void skd_enable_interrupts(struct skd_device *skdev) +{ + u32 val; + + /* unmask interrupts first */ + val = FIT_ISH_FW_STATE_CHANGE + + FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV; + + /* Note that the compliment of mask is written. A 1-bit means + * disable, a 0 means enable. */ + SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST); + dev_dbg(&skdev->pdev->dev, "interrupt mask=0x%x\n", ~val); + + val = SKD_READL(skdev, FIT_CONTROL); + val |= FIT_CR_ENABLE_INTERRUPTS; + dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val); + SKD_WRITEL(skdev, val, FIT_CONTROL); +} + +/* + ***************************************************************************** + * START, STOP, RESTART, QUIESCE, UNQUIESCE + ***************************************************************************** + */ + +static void skd_soft_reset(struct skd_device *skdev) +{ + u32 val; + + val = SKD_READL(skdev, FIT_CONTROL); + val |= (FIT_CR_SOFT_RESET); + dev_dbg(&skdev->pdev->dev, "control=0x%x\n", val); + SKD_WRITEL(skdev, val, FIT_CONTROL); +} + +static void skd_start_device(struct skd_device *skdev) +{ + unsigned long flags; + u32 sense; + u32 state; + + spin_lock_irqsave(&skdev->lock, flags); + + /* ack all ghost interrupts */ + SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST); + + sense = SKD_READL(skdev, FIT_STATUS); + + dev_dbg(&skdev->pdev->dev, "initial status=0x%x\n", sense); + + state = sense & FIT_SR_DRIVE_STATE_MASK; + skdev->drive_state = state; + skdev->last_mtd = 0; + + skdev->state = SKD_DRVR_STATE_STARTING; + skdev->timer_countdown = SKD_STARTING_TIMO; + + skd_enable_interrupts(skdev); + + switch (skdev->drive_state) { + case FIT_SR_DRIVE_OFFLINE: + dev_err(&skdev->pdev->dev, "Drive offline...\n"); + break; + + case FIT_SR_DRIVE_FW_BOOTING: + dev_dbg(&skdev->pdev->dev, "FIT_SR_DRIVE_FW_BOOTING\n"); + skdev->state = SKD_DRVR_STATE_WAIT_BOOT; + skdev->timer_countdown = SKD_WAIT_BOOT_TIMO; + break; + + case FIT_SR_DRIVE_BUSY_SANITIZE: + dev_info(&skdev->pdev->dev, "Start: BUSY_SANITIZE\n"); + skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE; + skdev->timer_countdown = SKD_STARTED_BUSY_TIMO; + break; + + case FIT_SR_DRIVE_BUSY_ERASE: + dev_info(&skdev->pdev->dev, "Start: BUSY_ERASE\n"); + skdev->state = SKD_DRVR_STATE_BUSY_ERASE; + skdev->timer_countdown = SKD_STARTED_BUSY_TIMO; + break; + + case FIT_SR_DRIVE_INIT: + case FIT_SR_DRIVE_ONLINE: + skd_soft_reset(skdev); + break; + + case FIT_SR_DRIVE_BUSY: + dev_err(&skdev->pdev->dev, "Drive Busy...\n"); + skdev->state = SKD_DRVR_STATE_BUSY; + skdev->timer_countdown = SKD_STARTED_BUSY_TIMO; + break; + + case FIT_SR_DRIVE_SOFT_RESET: + dev_err(&skdev->pdev->dev, "drive soft reset in prog\n"); + break; + + case FIT_SR_DRIVE_FAULT: + /* Fault state is bad...soft reset won't do it... + * Hard reset, maybe, but does it work on device? + * For now, just fault so the system doesn't hang. + */ + skd_drive_fault(skdev); + /*start the queue so we can respond with error to requests */ + dev_dbg(&skdev->pdev->dev, "starting queue\n"); + schedule_work(&skdev->start_queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + case 0xFF: + /* Most likely the device isn't there or isn't responding + * to the BAR1 addresses. */ + skd_drive_disappeared(skdev); + /*start the queue so we can respond with error to requests */ + dev_dbg(&skdev->pdev->dev, + "starting queue to error-out reqs\n"); + schedule_work(&skdev->start_queue); + skdev->gendisk_on = -1; + wake_up_interruptible(&skdev->waitq); + break; + + default: + dev_err(&skdev->pdev->dev, "Start: unknown state %x\n", + skdev->drive_state); + break; + } + + state = SKD_READL(skdev, FIT_CONTROL); + dev_dbg(&skdev->pdev->dev, "FIT Control Status=0x%x\n", state); + + state = SKD_READL(skdev, FIT_INT_STATUS_HOST); + dev_dbg(&skdev->pdev->dev, "Intr Status=0x%x\n", state); + + state = SKD_READL(skdev, FIT_INT_MASK_HOST); + dev_dbg(&skdev->pdev->dev, "Intr Mask=0x%x\n", state); + + state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE); + dev_dbg(&skdev->pdev->dev, "Msg from Dev=0x%x\n", state); + + state = SKD_READL(skdev, FIT_HW_VERSION); + dev_dbg(&skdev->pdev->dev, "HW version=0x%x\n", state); + + spin_unlock_irqrestore(&skdev->lock, flags); +} + +static void skd_stop_device(struct skd_device *skdev) +{ + unsigned long flags; + struct skd_special_context *skspcl = &skdev->internal_skspcl; + u32 dev_state; + int i; + + spin_lock_irqsave(&skdev->lock, flags); + + if (skdev->state != SKD_DRVR_STATE_ONLINE) { + dev_err(&skdev->pdev->dev, "%s not online no sync\n", __func__); + goto stop_out; + } + + if (skspcl->req.state != SKD_REQ_STATE_IDLE) { + dev_err(&skdev->pdev->dev, "%s no special\n", __func__); + goto stop_out; + } + + skdev->state = SKD_DRVR_STATE_SYNCING; + skdev->sync_done = 0; + + skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE); + + spin_unlock_irqrestore(&skdev->lock, flags); + + wait_event_interruptible_timeout(skdev->waitq, + (skdev->sync_done), (10 * HZ)); + + spin_lock_irqsave(&skdev->lock, flags); + + switch (skdev->sync_done) { + case 0: + dev_err(&skdev->pdev->dev, "%s no sync\n", __func__); + break; + case 1: + dev_err(&skdev->pdev->dev, "%s sync done\n", __func__); + break; + default: + dev_err(&skdev->pdev->dev, "%s sync error\n", __func__); + } + +stop_out: + skdev->state = SKD_DRVR_STATE_STOPPING; + spin_unlock_irqrestore(&skdev->lock, flags); + + skd_kill_timer(skdev); + + spin_lock_irqsave(&skdev->lock, flags); + skd_disable_interrupts(skdev); + + /* ensure all ints on device are cleared */ + /* soft reset the device to unload with a clean slate */ + SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST); + SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL); + + spin_unlock_irqrestore(&skdev->lock, flags); + + /* poll every 100ms, 1 second timeout */ + for (i = 0; i < 10; i++) { + dev_state = + SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK; + if (dev_state == FIT_SR_DRIVE_INIT) + break; + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(msecs_to_jiffies(100)); + } + + if (dev_state != FIT_SR_DRIVE_INIT) + dev_err(&skdev->pdev->dev, "%s state error 0x%02x\n", __func__, + dev_state); +} + +/* assume spinlock is held */ +static void skd_restart_device(struct skd_device *skdev) +{ + u32 state; + + /* ack all ghost interrupts */ + SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST); + + state = SKD_READL(skdev, FIT_STATUS); + + dev_dbg(&skdev->pdev->dev, "drive status=0x%x\n", state); + + state &= FIT_SR_DRIVE_STATE_MASK; + skdev->drive_state = state; + skdev->last_mtd = 0; + + skdev->state = SKD_DRVR_STATE_RESTARTING; + skdev->timer_countdown = SKD_RESTARTING_TIMO; + + skd_soft_reset(skdev); +} + +/* assume spinlock is held */ +static int skd_quiesce_dev(struct skd_device *skdev) +{ + int rc = 0; + + switch (skdev->state) { + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + dev_dbg(&skdev->pdev->dev, "stopping queue\n"); + blk_mq_stop_hw_queues(skdev->queue); + break; + case SKD_DRVR_STATE_ONLINE: + case SKD_DRVR_STATE_STOPPING: + case SKD_DRVR_STATE_SYNCING: + case SKD_DRVR_STATE_PAUSING: + case SKD_DRVR_STATE_PAUSED: + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + case SKD_DRVR_STATE_RESUMING: + default: + rc = -EINVAL; + dev_dbg(&skdev->pdev->dev, "state [%d] not implemented\n", + skdev->state); + } + return rc; +} + +/* assume spinlock is held */ +static int skd_unquiesce_dev(struct skd_device *skdev) +{ + int prev_driver_state = skdev->state; + + skd_log_skdev(skdev, "unquiesce"); + if (skdev->state == SKD_DRVR_STATE_ONLINE) { + dev_dbg(&skdev->pdev->dev, "**** device already ONLINE\n"); + return 0; + } + if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) { + /* + * If there has been an state change to other than + * ONLINE, we will rely on controller state change + * to come back online and restart the queue. + * The BUSY state means that driver is ready to + * continue normal processing but waiting for controller + * to become available. + */ + skdev->state = SKD_DRVR_STATE_BUSY; + dev_dbg(&skdev->pdev->dev, "drive BUSY state\n"); + return 0; + } + + /* + * Drive has just come online, driver is either in startup, + * paused performing a task, or bust waiting for hardware. + */ + switch (skdev->state) { + case SKD_DRVR_STATE_PAUSED: + case SKD_DRVR_STATE_BUSY: + case SKD_DRVR_STATE_BUSY_IMMINENT: + case SKD_DRVR_STATE_BUSY_ERASE: + case SKD_DRVR_STATE_STARTING: + case SKD_DRVR_STATE_RESTARTING: + case SKD_DRVR_STATE_FAULT: + case SKD_DRVR_STATE_IDLE: + case SKD_DRVR_STATE_LOAD: + skdev->state = SKD_DRVR_STATE_ONLINE; + dev_err(&skdev->pdev->dev, "Driver state %s(%d)=>%s(%d)\n", + skd_skdev_state_to_str(prev_driver_state), + prev_driver_state, skd_skdev_state_to_str(skdev->state), + skdev->state); + dev_dbg(&skdev->pdev->dev, + "**** device ONLINE...starting block queue\n"); + dev_dbg(&skdev->pdev->dev, "starting queue\n"); + dev_info(&skdev->pdev->dev, "STEC s1120 ONLINE\n"); + schedule_work(&skdev->start_queue); + skdev->gendisk_on = 1; + wake_up_interruptible(&skdev->waitq); + break; + + case SKD_DRVR_STATE_DISAPPEARED: + default: + dev_dbg(&skdev->pdev->dev, + "**** driver state %d, not implemented\n", + skdev->state); + return -EBUSY; + } + return 0; +} + +/* + ***************************************************************************** + * PCIe MSI/MSI-X INTERRUPT HANDLERS + ***************************************************************************** + */ + +static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n", + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + dev_err(&skdev->pdev->dev, "MSIX reserved irq %d = 0x%x\n", irq, + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t skd_statec_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n", + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST); + skd_isr_fwstate(skdev); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t skd_comp_q(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + int flush_enqueued = 0; + int deferred; + + spin_lock_irqsave(&skdev->lock, flags); + dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n", + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST); + deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit, + &flush_enqueued); + if (flush_enqueued) + schedule_work(&skdev->start_queue); + + if (deferred) + schedule_work(&skdev->completion_worker); + else if (!flush_enqueued) + schedule_work(&skdev->start_queue); + + spin_unlock_irqrestore(&skdev->lock, flags); + + return IRQ_HANDLED; +} + +static irqreturn_t skd_msg_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n", + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST); + skd_isr_msg_from_dev(skdev); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data) +{ + struct skd_device *skdev = skd_host_data; + unsigned long flags; + + spin_lock_irqsave(&skdev->lock, flags); + dev_dbg(&skdev->pdev->dev, "MSIX = 0x%x\n", + SKD_READL(skdev, FIT_INT_STATUS_HOST)); + SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST); + spin_unlock_irqrestore(&skdev->lock, flags); + return IRQ_HANDLED; +} + +/* + ***************************************************************************** + * PCIe MSI/MSI-X SETUP + ***************************************************************************** + */ + +struct skd_msix_entry { + char isr_name[30]; +}; + +struct skd_init_msix_entry { + const char *name; + irq_handler_t handler; +}; + +#define SKD_MAX_MSIX_COUNT 13 +#define SKD_MIN_MSIX_COUNT 7 +#define SKD_BASE_MSIX_IRQ 4 + +static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = { + { "(DMA 0)", skd_reserved_isr }, + { "(DMA 1)", skd_reserved_isr }, + { "(DMA 2)", skd_reserved_isr }, + { "(DMA 3)", skd_reserved_isr }, + { "(State Change)", skd_statec_isr }, + { "(COMPL_Q)", skd_comp_q }, + { "(MSG)", skd_msg_isr }, + { "(Reserved)", skd_reserved_isr }, + { "(Reserved)", skd_reserved_isr }, + { "(Queue Full 0)", skd_qfull_isr }, + { "(Queue Full 1)", skd_qfull_isr }, + { "(Queue Full 2)", skd_qfull_isr }, + { "(Queue Full 3)", skd_qfull_isr }, +}; + +static int skd_acquire_msix(struct skd_device *skdev) +{ + int i, rc; + struct pci_dev *pdev = skdev->pdev; + + rc = pci_alloc_irq_vectors(pdev, SKD_MAX_MSIX_COUNT, SKD_MAX_MSIX_COUNT, + PCI_IRQ_MSIX); + if (rc < 0) { + dev_err(&skdev->pdev->dev, "failed to enable MSI-X %d\n", rc); + goto out; + } + + skdev->msix_entries = kcalloc(SKD_MAX_MSIX_COUNT, + sizeof(struct skd_msix_entry), GFP_KERNEL); + if (!skdev->msix_entries) { + rc = -ENOMEM; + dev_err(&skdev->pdev->dev, "msix table allocation error\n"); + goto out; + } + + /* Enable MSI-X vectors for the base queue */ + for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) { + struct skd_msix_entry *qentry = &skdev->msix_entries[i]; + + snprintf(qentry->isr_name, sizeof(qentry->isr_name), + "%s%d-msix %s", DRV_NAME, skdev->devno, + msix_entries[i].name); + + rc = devm_request_irq(&skdev->pdev->dev, + pci_irq_vector(skdev->pdev, i), + msix_entries[i].handler, 0, + qentry->isr_name, skdev); + if (rc) { + dev_err(&skdev->pdev->dev, + "Unable to register(%d) MSI-X handler %d: %s\n", + rc, i, qentry->isr_name); + goto msix_out; + } + } + + dev_dbg(&skdev->pdev->dev, "%d msix irq(s) enabled\n", + SKD_MAX_MSIX_COUNT); + return 0; + +msix_out: + while (--i >= 0) + devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), skdev); +out: + kfree(skdev->msix_entries); + skdev->msix_entries = NULL; + return rc; +} + +static int skd_acquire_irq(struct skd_device *skdev) +{ + struct pci_dev *pdev = skdev->pdev; + unsigned int irq_flag = PCI_IRQ_LEGACY; + int rc; + + if (skd_isr_type == SKD_IRQ_MSIX) { + rc = skd_acquire_msix(skdev); + if (!rc) + return 0; + + dev_err(&skdev->pdev->dev, + "failed to enable MSI-X, re-trying with MSI %d\n", rc); + } + + snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d", DRV_NAME, + skdev->devno); + + if (skd_isr_type != SKD_IRQ_LEGACY) + irq_flag |= PCI_IRQ_MSI; + rc = pci_alloc_irq_vectors(pdev, 1, 1, irq_flag); + if (rc < 0) { + dev_err(&skdev->pdev->dev, + "failed to allocate the MSI interrupt %d\n", rc); + return rc; + } + + rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr, + pdev->msi_enabled ? 0 : IRQF_SHARED, + skdev->isr_name, skdev); + if (rc) { + pci_free_irq_vectors(pdev); + dev_err(&skdev->pdev->dev, "failed to allocate interrupt %d\n", + rc); + return rc; + } + + return 0; +} + +static void skd_release_irq(struct skd_device *skdev) +{ + struct pci_dev *pdev = skdev->pdev; + + if (skdev->msix_entries) { + int i; + + for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) { + devm_free_irq(&pdev->dev, pci_irq_vector(pdev, i), + skdev); + } + + kfree(skdev->msix_entries); + skdev->msix_entries = NULL; + } else { + devm_free_irq(&pdev->dev, pdev->irq, skdev); + } + + pci_free_irq_vectors(pdev); +} + +/* + ***************************************************************************** + * CONSTRUCT + ***************************************************************************** + */ + +static void *skd_alloc_dma(struct skd_device *skdev, struct kmem_cache *s, + dma_addr_t *dma_handle, gfp_t gfp, + enum dma_data_direction dir) +{ + struct device *dev = &skdev->pdev->dev; + void *buf; + + buf = kmem_cache_alloc(s, gfp); + if (!buf) + return NULL; + *dma_handle = dma_map_single(dev, buf, + kmem_cache_size(s), dir); + if (dma_mapping_error(dev, *dma_handle)) { + kmem_cache_free(s, buf); + buf = NULL; + } + return buf; +} + +static void skd_free_dma(struct skd_device *skdev, struct kmem_cache *s, + void *vaddr, dma_addr_t dma_handle, + enum dma_data_direction dir) +{ + if (!vaddr) + return; + + dma_unmap_single(&skdev->pdev->dev, dma_handle, + kmem_cache_size(s), dir); + kmem_cache_free(s, vaddr); +} + +static int skd_cons_skcomp(struct skd_device *skdev) +{ + int rc = 0; + struct fit_completion_entry_v1 *skcomp; + + dev_dbg(&skdev->pdev->dev, + "comp pci_alloc, total bytes %zd entries %d\n", + SKD_SKCOMP_SIZE, SKD_N_COMPLETION_ENTRY); + + skcomp = pci_zalloc_consistent(skdev->pdev, SKD_SKCOMP_SIZE, + &skdev->cq_dma_address); + + if (skcomp == NULL) { + rc = -ENOMEM; + goto err_out; + } + + skdev->skcomp_table = skcomp; + skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp + + sizeof(*skcomp) * + SKD_N_COMPLETION_ENTRY); + +err_out: + return rc; +} + +static int skd_cons_skmsg(struct skd_device *skdev) +{ + int rc = 0; + u32 i; + + dev_dbg(&skdev->pdev->dev, + "skmsg_table kcalloc, struct %lu, count %u total %lu\n", + sizeof(struct skd_fitmsg_context), skdev->num_fitmsg_context, + sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context); + + skdev->skmsg_table = kcalloc(skdev->num_fitmsg_context, + sizeof(struct skd_fitmsg_context), + GFP_KERNEL); + if (skdev->skmsg_table == NULL) { + rc = -ENOMEM; + goto err_out; + } + + for (i = 0; i < skdev->num_fitmsg_context; i++) { + struct skd_fitmsg_context *skmsg; + + skmsg = &skdev->skmsg_table[i]; + + skmsg->id = i + SKD_ID_FIT_MSG; + + skmsg->msg_buf = pci_alloc_consistent(skdev->pdev, + SKD_N_FITMSG_BYTES, + &skmsg->mb_dma_address); + + if (skmsg->msg_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + WARN(((uintptr_t)skmsg->msg_buf | skmsg->mb_dma_address) & + (FIT_QCMD_ALIGN - 1), + "not aligned: msg_buf %p mb_dma_address %pad\n", + skmsg->msg_buf, &skmsg->mb_dma_address); + memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES); + } + +err_out: + return rc; +} + +static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev, + u32 n_sg, + dma_addr_t *ret_dma_addr) +{ + struct fit_sg_descriptor *sg_list; + + sg_list = skd_alloc_dma(skdev, skdev->sglist_cache, ret_dma_addr, + GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE); + + if (sg_list != NULL) { + uint64_t dma_address = *ret_dma_addr; + u32 i; + + for (i = 0; i < n_sg - 1; i++) { + uint64_t ndp_off; + ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor); + + sg_list[i].next_desc_ptr = dma_address + ndp_off; + } + sg_list[i].next_desc_ptr = 0LL; + } + + return sg_list; +} + +static void skd_free_sg_list(struct skd_device *skdev, + struct fit_sg_descriptor *sg_list, + dma_addr_t dma_addr) +{ + if (WARN_ON_ONCE(!sg_list)) + return; + + skd_free_dma(skdev, skdev->sglist_cache, sg_list, dma_addr, + DMA_TO_DEVICE); +} + +static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq, + unsigned int hctx_idx, unsigned int numa_node) +{ + struct skd_device *skdev = set->driver_data; + struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq); + + skreq->state = SKD_REQ_STATE_IDLE; + skreq->sg = (void *)(skreq + 1); + sg_init_table(skreq->sg, skd_sgs_per_request); + skreq->sksg_list = skd_cons_sg_list(skdev, skd_sgs_per_request, + &skreq->sksg_dma_address); + + return skreq->sksg_list ? 0 : -ENOMEM; +} + +static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq, + unsigned int hctx_idx) +{ + struct skd_device *skdev = set->driver_data; + struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq); + + skd_free_sg_list(skdev, skreq->sksg_list, skreq->sksg_dma_address); +} + +static int skd_cons_sksb(struct skd_device *skdev) +{ + int rc = 0; + struct skd_special_context *skspcl; + + skspcl = &skdev->internal_skspcl; + + skspcl->req.id = 0 + SKD_ID_INTERNAL; + skspcl->req.state = SKD_REQ_STATE_IDLE; + + skspcl->data_buf = skd_alloc_dma(skdev, skdev->databuf_cache, + &skspcl->db_dma_address, + GFP_DMA | __GFP_ZERO, + DMA_BIDIRECTIONAL); + if (skspcl->data_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + skspcl->msg_buf = skd_alloc_dma(skdev, skdev->msgbuf_cache, + &skspcl->mb_dma_address, + GFP_DMA | __GFP_ZERO, DMA_TO_DEVICE); + if (skspcl->msg_buf == NULL) { + rc = -ENOMEM; + goto err_out; + } + + skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1, + &skspcl->req.sksg_dma_address); + if (skspcl->req.sksg_list == NULL) { + rc = -ENOMEM; + goto err_out; + } + + if (!skd_format_internal_skspcl(skdev)) { + rc = -EINVAL; + goto err_out; + } + +err_out: + return rc; +} + +static const struct blk_mq_ops skd_mq_ops = { + .queue_rq = skd_mq_queue_rq, + .complete = skd_complete_rq, + .timeout = skd_timed_out, + .init_request = skd_init_request, + .exit_request = skd_exit_request, +}; + +static int skd_cons_disk(struct skd_device *skdev) +{ + int rc = 0; + struct gendisk *disk; + struct request_queue *q; + unsigned long flags; + + disk = alloc_disk(SKD_MINORS_PER_DEVICE); + if (!disk) { + rc = -ENOMEM; + goto err_out; + } + + skdev->disk = disk; + sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno); + + disk->major = skdev->major; + disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE; + disk->fops = &skd_blockdev_ops; + disk->private_data = skdev; + + memset(&skdev->tag_set, 0, sizeof(skdev->tag_set)); + skdev->tag_set.ops = &skd_mq_ops; + skdev->tag_set.nr_hw_queues = 1; + skdev->tag_set.queue_depth = skd_max_queue_depth; + skdev->tag_set.cmd_size = sizeof(struct skd_request_context) + + skdev->sgs_per_request * sizeof(struct scatterlist); + skdev->tag_set.numa_node = NUMA_NO_NODE; + skdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | + BLK_MQ_F_SG_MERGE | + BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO); + skdev->tag_set.driver_data = skdev; + rc = blk_mq_alloc_tag_set(&skdev->tag_set); + if (rc) + goto err_out; + q = blk_mq_init_queue(&skdev->tag_set); + if (IS_ERR(q)) { + blk_mq_free_tag_set(&skdev->tag_set); + rc = PTR_ERR(q); + goto err_out; + } + q->queuedata = skdev; + + skdev->queue = q; + disk->queue = q; + + blk_queue_write_cache(q, true, true); + blk_queue_max_segments(q, skdev->sgs_per_request); + blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS); + + /* set optimal I/O size to 8KB */ + blk_queue_io_opt(q, 8192); + + blk_queue_flag_set(QUEUE_FLAG_NONROT, q); + blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q); + + blk_queue_rq_timeout(q, 8 * HZ); + + spin_lock_irqsave(&skdev->lock, flags); + dev_dbg(&skdev->pdev->dev, "stopping queue\n"); + blk_mq_stop_hw_queues(skdev->queue); + spin_unlock_irqrestore(&skdev->lock, flags); + +err_out: + return rc; +} + +#define SKD_N_DEV_TABLE 16u +static u32 skd_next_devno; + +static struct skd_device *skd_construct(struct pci_dev *pdev) +{ + struct skd_device *skdev; + int blk_major = skd_major; + size_t size; + int rc; + + skdev = kzalloc(sizeof(*skdev), GFP_KERNEL); + + if (!skdev) { + dev_err(&pdev->dev, "memory alloc failure\n"); + return NULL; + } + + skdev->state = SKD_DRVR_STATE_LOAD; + skdev->pdev = pdev; + skdev->devno = skd_next_devno++; + skdev->major = blk_major; + skdev->dev_max_queue_depth = 0; + + skdev->num_req_context = skd_max_queue_depth; + skdev->num_fitmsg_context = skd_max_queue_depth; + skdev->cur_max_queue_depth = 1; + skdev->queue_low_water_mark = 1; + skdev->proto_ver = 99; + skdev->sgs_per_request = skd_sgs_per_request; + skdev->dbg_level = skd_dbg_level; + + spin_lock_init(&skdev->lock); + + INIT_WORK(&skdev->start_queue, skd_start_queue); + INIT_WORK(&skdev->completion_worker, skd_completion_worker); + + size = max(SKD_N_FITMSG_BYTES, SKD_N_SPECIAL_FITMSG_BYTES); + skdev->msgbuf_cache = kmem_cache_create("skd-msgbuf", size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!skdev->msgbuf_cache) + goto err_out; + WARN_ONCE(kmem_cache_size(skdev->msgbuf_cache) < size, + "skd-msgbuf: %d < %zd\n", + kmem_cache_size(skdev->msgbuf_cache), size); + size = skd_sgs_per_request * sizeof(struct fit_sg_descriptor); + skdev->sglist_cache = kmem_cache_create("skd-sglist", size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!skdev->sglist_cache) + goto err_out; + WARN_ONCE(kmem_cache_size(skdev->sglist_cache) < size, + "skd-sglist: %d < %zd\n", + kmem_cache_size(skdev->sglist_cache), size); + size = SKD_N_INTERNAL_BYTES; + skdev->databuf_cache = kmem_cache_create("skd-databuf", size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!skdev->databuf_cache) + goto err_out; + WARN_ONCE(kmem_cache_size(skdev->databuf_cache) < size, + "skd-databuf: %d < %zd\n", + kmem_cache_size(skdev->databuf_cache), size); + + dev_dbg(&skdev->pdev->dev, "skcomp\n"); + rc = skd_cons_skcomp(skdev); + if (rc < 0) + goto err_out; + + dev_dbg(&skdev->pdev->dev, "skmsg\n"); + rc = skd_cons_skmsg(skdev); + if (rc < 0) + goto err_out; + + dev_dbg(&skdev->pdev->dev, "sksb\n"); + rc = skd_cons_sksb(skdev); + if (rc < 0) + goto err_out; + + dev_dbg(&skdev->pdev->dev, "disk\n"); + rc = skd_cons_disk(skdev); + if (rc < 0) + goto err_out; + + dev_dbg(&skdev->pdev->dev, "VICTORY\n"); + return skdev; + +err_out: + dev_dbg(&skdev->pdev->dev, "construct failed\n"); + skd_destruct(skdev); + return NULL; +} + +/* + ***************************************************************************** + * DESTRUCT (FREE) + ***************************************************************************** + */ + +static void skd_free_skcomp(struct skd_device *skdev) +{ + if (skdev->skcomp_table) + pci_free_consistent(skdev->pdev, SKD_SKCOMP_SIZE, + skdev->skcomp_table, skdev->cq_dma_address); + + skdev->skcomp_table = NULL; + skdev->cq_dma_address = 0; +} + +static void skd_free_skmsg(struct skd_device *skdev) +{ + u32 i; + + if (skdev->skmsg_table == NULL) + return; + + for (i = 0; i < skdev->num_fitmsg_context; i++) { + struct skd_fitmsg_context *skmsg; + + skmsg = &skdev->skmsg_table[i]; + + if (skmsg->msg_buf != NULL) { + pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES, + skmsg->msg_buf, + skmsg->mb_dma_address); + } + skmsg->msg_buf = NULL; + skmsg->mb_dma_address = 0; + } + + kfree(skdev->skmsg_table); + skdev->skmsg_table = NULL; +} + +static void skd_free_sksb(struct skd_device *skdev) +{ + struct skd_special_context *skspcl = &skdev->internal_skspcl; + + skd_free_dma(skdev, skdev->databuf_cache, skspcl->data_buf, + skspcl->db_dma_address, DMA_BIDIRECTIONAL); + + skspcl->data_buf = NULL; + skspcl->db_dma_address = 0; + + skd_free_dma(skdev, skdev->msgbuf_cache, skspcl->msg_buf, + skspcl->mb_dma_address, DMA_TO_DEVICE); + + skspcl->msg_buf = NULL; + skspcl->mb_dma_address = 0; + + skd_free_sg_list(skdev, skspcl->req.sksg_list, + skspcl->req.sksg_dma_address); + + skspcl->req.sksg_list = NULL; + skspcl->req.sksg_dma_address = 0; +} + +static void skd_free_disk(struct skd_device *skdev) +{ + struct gendisk *disk = skdev->disk; + + if (disk && (disk->flags & GENHD_FL_UP)) + del_gendisk(disk); + + if (skdev->queue) { + blk_cleanup_queue(skdev->queue); + skdev->queue = NULL; + if (disk) + disk->queue = NULL; + } + + if (skdev->tag_set.tags) + blk_mq_free_tag_set(&skdev->tag_set); + + put_disk(disk); + skdev->disk = NULL; +} + +static void skd_destruct(struct skd_device *skdev) +{ + if (skdev == NULL) + return; + + cancel_work_sync(&skdev->start_queue); + + dev_dbg(&skdev->pdev->dev, "disk\n"); + skd_free_disk(skdev); + + dev_dbg(&skdev->pdev->dev, "sksb\n"); + skd_free_sksb(skdev); + + dev_dbg(&skdev->pdev->dev, "skmsg\n"); + skd_free_skmsg(skdev); + + dev_dbg(&skdev->pdev->dev, "skcomp\n"); + skd_free_skcomp(skdev); + + kmem_cache_destroy(skdev->databuf_cache); + kmem_cache_destroy(skdev->sglist_cache); + kmem_cache_destroy(skdev->msgbuf_cache); + + dev_dbg(&skdev->pdev->dev, "skdev\n"); + kfree(skdev); +} + +/* + ***************************************************************************** + * BLOCK DEVICE (BDEV) GLUE + ***************************************************************************** + */ + +static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo) +{ + struct skd_device *skdev; + u64 capacity; + + skdev = bdev->bd_disk->private_data; + + dev_dbg(&skdev->pdev->dev, "%s: CMD[%s] getgeo device\n", + bdev->bd_disk->disk_name, current->comm); + + if (skdev->read_cap_is_valid) { + capacity = get_capacity(skdev->disk); + geo->heads = 64; + geo->sectors = 255; + geo->cylinders = (capacity) / (255 * 64); + + return 0; + } + return -EIO; +} + +static int skd_bdev_attach(struct device *parent, struct skd_device *skdev) +{ + dev_dbg(&skdev->pdev->dev, "add_disk\n"); + device_add_disk(parent, skdev->disk, NULL); + return 0; +} + +static const struct block_device_operations skd_blockdev_ops = { + .owner = THIS_MODULE, + .getgeo = skd_bdev_getgeo, +}; + +/* + ***************************************************************************** + * PCIe DRIVER GLUE + ***************************************************************************** + */ + +static const struct pci_device_id skd_pci_tbl[] = { + { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, }, + { 0 } /* terminate list */ +}; + +MODULE_DEVICE_TABLE(pci, skd_pci_tbl); + +static char *skd_pci_info(struct skd_device *skdev, char *str) +{ + int pcie_reg; + + strcpy(str, "PCIe ("); + pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP); + + if (pcie_reg) { + + char lwstr[6]; + uint16_t pcie_lstat, lspeed, lwidth; + + pcie_reg += 0x12; + pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat); + lspeed = pcie_lstat & (0xF); + lwidth = (pcie_lstat & 0x3F0) >> 4; + + if (lspeed == 1) + strcat(str, "2.5GT/s "); + else if (lspeed == 2) + strcat(str, "5.0GT/s "); + else + strcat(str, "<unknown> "); + snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth); + strcat(str, lwstr); + } + return str; +} + +static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + int i; + int rc = 0; + char pci_str[32]; + struct skd_device *skdev; + + dev_dbg(&pdev->dev, "vendor=%04X device=%04x\n", pdev->vendor, + pdev->device); + + rc = pci_enable_device(pdev); + if (rc) + return rc; + rc = pci_request_regions(pdev, DRV_NAME); + if (rc) + goto err_out; + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (!rc) { + if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) { + dev_err(&pdev->dev, "consistent DMA mask error %d\n", + rc); + } + } else { + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) { + dev_err(&pdev->dev, "DMA mask error %d\n", rc); + goto err_out_regions; + } + } + + if (!skd_major) { + rc = register_blkdev(0, DRV_NAME); + if (rc < 0) + goto err_out_regions; + BUG_ON(!rc); + skd_major = rc; + } + + skdev = skd_construct(pdev); + if (skdev == NULL) { + rc = -ENOMEM; + goto err_out_regions; + } + + skd_pci_info(skdev, pci_str); + dev_info(&pdev->dev, "%s 64bit\n", pci_str); + + pci_set_master(pdev); + rc = pci_enable_pcie_error_reporting(pdev); + if (rc) { + dev_err(&pdev->dev, + "bad enable of PCIe error reporting rc=%d\n", rc); + skdev->pcie_error_reporting_is_enabled = 0; + } else + skdev->pcie_error_reporting_is_enabled = 1; + + pci_set_drvdata(pdev, skdev); + + for (i = 0; i < SKD_MAX_BARS; i++) { + skdev->mem_phys[i] = pci_resource_start(pdev, i); + skdev->mem_size[i] = (u32)pci_resource_len(pdev, i); + skdev->mem_map[i] = ioremap(skdev->mem_phys[i], + skdev->mem_size[i]); + if (!skdev->mem_map[i]) { + dev_err(&pdev->dev, + "Unable to map adapter memory!\n"); + rc = -ENODEV; + goto err_out_iounmap; + } + dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n", + skdev->mem_map[i], (uint64_t)skdev->mem_phys[i], + skdev->mem_size[i]); + } + + rc = skd_acquire_irq(skdev); + if (rc) { + dev_err(&pdev->dev, "interrupt resource error %d\n", rc); + goto err_out_iounmap; + } + + rc = skd_start_timer(skdev); + if (rc) + goto err_out_timer; + + init_waitqueue_head(&skdev->waitq); + + skd_start_device(skdev); + + rc = wait_event_interruptible_timeout(skdev->waitq, + (skdev->gendisk_on), + (SKD_START_WAIT_SECONDS * HZ)); + if (skdev->gendisk_on > 0) { + /* device came on-line after reset */ + skd_bdev_attach(&pdev->dev, skdev); + rc = 0; + } else { + /* we timed out, something is wrong with the device, + don't add the disk structure */ + dev_err(&pdev->dev, "error: waiting for s1120 timed out %d!\n", + rc); + /* in case of no error; we timeout with ENXIO */ + if (!rc) + rc = -ENXIO; + goto err_out_timer; + } + + return rc; + +err_out_timer: + skd_stop_device(skdev); + skd_release_irq(skdev); + +err_out_iounmap: + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap(skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + + skd_destruct(skdev); + +err_out_regions: + pci_release_regions(pdev); + +err_out: + pci_disable_device(pdev); + pci_set_drvdata(pdev, NULL); + return rc; +} + +static void skd_pci_remove(struct pci_dev *pdev) +{ + int i; + struct skd_device *skdev; + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + dev_err(&pdev->dev, "no device data for PCI\n"); + return; + } + skd_stop_device(skdev); + skd_release_irq(skdev); + + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap(skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + + skd_destruct(skdev); + + pci_release_regions(pdev); + pci_disable_device(pdev); + pci_set_drvdata(pdev, NULL); + + return; +} + +static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state) +{ + int i; + struct skd_device *skdev; + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + dev_err(&pdev->dev, "no device data for PCI\n"); + return -EIO; + } + + skd_stop_device(skdev); + + skd_release_irq(skdev); + + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap(skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + + pci_release_regions(pdev); + pci_save_state(pdev); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + return 0; +} + +static int skd_pci_resume(struct pci_dev *pdev) +{ + int i; + int rc = 0; + struct skd_device *skdev; + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + dev_err(&pdev->dev, "no device data for PCI\n"); + return -1; + } + + pci_set_power_state(pdev, PCI_D0); + pci_enable_wake(pdev, PCI_D0, 0); + pci_restore_state(pdev); + + rc = pci_enable_device(pdev); + if (rc) + return rc; + rc = pci_request_regions(pdev, DRV_NAME); + if (rc) + goto err_out; + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (!rc) { + if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) { + + dev_err(&pdev->dev, "consistent DMA mask error %d\n", + rc); + } + } else { + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) { + + dev_err(&pdev->dev, "DMA mask error %d\n", rc); + goto err_out_regions; + } + } + + pci_set_master(pdev); + rc = pci_enable_pcie_error_reporting(pdev); + if (rc) { + dev_err(&pdev->dev, + "bad enable of PCIe error reporting rc=%d\n", rc); + skdev->pcie_error_reporting_is_enabled = 0; + } else + skdev->pcie_error_reporting_is_enabled = 1; + + for (i = 0; i < SKD_MAX_BARS; i++) { + + skdev->mem_phys[i] = pci_resource_start(pdev, i); + skdev->mem_size[i] = (u32)pci_resource_len(pdev, i); + skdev->mem_map[i] = ioremap(skdev->mem_phys[i], + skdev->mem_size[i]); + if (!skdev->mem_map[i]) { + dev_err(&pdev->dev, "Unable to map adapter memory!\n"); + rc = -ENODEV; + goto err_out_iounmap; + } + dev_dbg(&pdev->dev, "mem_map=%p, phyd=%016llx, size=%d\n", + skdev->mem_map[i], (uint64_t)skdev->mem_phys[i], + skdev->mem_size[i]); + } + rc = skd_acquire_irq(skdev); + if (rc) { + dev_err(&pdev->dev, "interrupt resource error %d\n", rc); + goto err_out_iounmap; + } + + rc = skd_start_timer(skdev); + if (rc) + goto err_out_timer; + + init_waitqueue_head(&skdev->waitq); + + skd_start_device(skdev); + + return rc; + +err_out_timer: + skd_stop_device(skdev); + skd_release_irq(skdev); + +err_out_iounmap: + for (i = 0; i < SKD_MAX_BARS; i++) + if (skdev->mem_map[i]) + iounmap(skdev->mem_map[i]); + + if (skdev->pcie_error_reporting_is_enabled) + pci_disable_pcie_error_reporting(pdev); + +err_out_regions: + pci_release_regions(pdev); + +err_out: + pci_disable_device(pdev); + return rc; +} + +static void skd_pci_shutdown(struct pci_dev *pdev) +{ + struct skd_device *skdev; + + dev_err(&pdev->dev, "%s called\n", __func__); + + skdev = pci_get_drvdata(pdev); + if (!skdev) { + dev_err(&pdev->dev, "no device data for PCI\n"); + return; + } + + dev_err(&pdev->dev, "calling stop\n"); + skd_stop_device(skdev); +} + +static struct pci_driver skd_driver = { + .name = DRV_NAME, + .id_table = skd_pci_tbl, + .probe = skd_pci_probe, + .remove = skd_pci_remove, + .suspend = skd_pci_suspend, + .resume = skd_pci_resume, + .shutdown = skd_pci_shutdown, +}; + +/* + ***************************************************************************** + * LOGGING SUPPORT + ***************************************************************************** + */ + +const char *skd_drive_state_to_str(int state) +{ + switch (state) { + case FIT_SR_DRIVE_OFFLINE: + return "OFFLINE"; + case FIT_SR_DRIVE_INIT: + return "INIT"; + case FIT_SR_DRIVE_ONLINE: + return "ONLINE"; + case FIT_SR_DRIVE_BUSY: + return "BUSY"; + case FIT_SR_DRIVE_FAULT: + return "FAULT"; + case FIT_SR_DRIVE_DEGRADED: + return "DEGRADED"; + case FIT_SR_PCIE_LINK_DOWN: + return "INK_DOWN"; + case FIT_SR_DRIVE_SOFT_RESET: + return "SOFT_RESET"; + case FIT_SR_DRIVE_NEED_FW_DOWNLOAD: + return "NEED_FW"; + case FIT_SR_DRIVE_INIT_FAULT: + return "INIT_FAULT"; + case FIT_SR_DRIVE_BUSY_SANITIZE: + return "BUSY_SANITIZE"; + case FIT_SR_DRIVE_BUSY_ERASE: + return "BUSY_ERASE"; + case FIT_SR_DRIVE_FW_BOOTING: + return "FW_BOOTING"; + default: + return "???"; + } +} + +const char *skd_skdev_state_to_str(enum skd_drvr_state state) +{ + switch (state) { + case SKD_DRVR_STATE_LOAD: + return "LOAD"; + case SKD_DRVR_STATE_IDLE: + return "IDLE"; + case SKD_DRVR_STATE_BUSY: + return "BUSY"; + case SKD_DRVR_STATE_STARTING: + return "STARTING"; + case SKD_DRVR_STATE_ONLINE: + return "ONLINE"; + case SKD_DRVR_STATE_PAUSING: + return "PAUSING"; + case SKD_DRVR_STATE_PAUSED: + return "PAUSED"; + case SKD_DRVR_STATE_RESTARTING: + return "RESTARTING"; + case SKD_DRVR_STATE_RESUMING: + return "RESUMING"; + case SKD_DRVR_STATE_STOPPING: + return "STOPPING"; + case SKD_DRVR_STATE_SYNCING: + return "SYNCING"; + case SKD_DRVR_STATE_FAULT: + return "FAULT"; + case SKD_DRVR_STATE_DISAPPEARED: + return "DISAPPEARED"; + case SKD_DRVR_STATE_BUSY_ERASE: + return "BUSY_ERASE"; + case SKD_DRVR_STATE_BUSY_SANITIZE: + return "BUSY_SANITIZE"; + case SKD_DRVR_STATE_BUSY_IMMINENT: + return "BUSY_IMMINENT"; + case SKD_DRVR_STATE_WAIT_BOOT: + return "WAIT_BOOT"; + + default: + return "???"; + } +} + +static const char *skd_skreq_state_to_str(enum skd_req_state state) +{ + switch (state) { + case SKD_REQ_STATE_IDLE: + return "IDLE"; + case SKD_REQ_STATE_SETUP: + return "SETUP"; + case SKD_REQ_STATE_BUSY: + return "BUSY"; + case SKD_REQ_STATE_COMPLETED: + return "COMPLETED"; + case SKD_REQ_STATE_TIMEOUT: + return "TIMEOUT"; + default: + return "???"; + } +} + +static void skd_log_skdev(struct skd_device *skdev, const char *event) +{ + dev_dbg(&skdev->pdev->dev, "skdev=%p event='%s'\n", skdev, event); + dev_dbg(&skdev->pdev->dev, " drive_state=%s(%d) driver_state=%s(%d)\n", + skd_drive_state_to_str(skdev->drive_state), skdev->drive_state, + skd_skdev_state_to_str(skdev->state), skdev->state); + dev_dbg(&skdev->pdev->dev, " busy=%d limit=%d dev=%d lowat=%d\n", + skd_in_flight(skdev), skdev->cur_max_queue_depth, + skdev->dev_max_queue_depth, skdev->queue_low_water_mark); + dev_dbg(&skdev->pdev->dev, " cycle=%d cycle_ix=%d\n", + skdev->skcomp_cycle, skdev->skcomp_ix); +} + +static void skd_log_skreq(struct skd_device *skdev, + struct skd_request_context *skreq, const char *event) +{ + struct request *req = blk_mq_rq_from_pdu(skreq); + u32 lba = blk_rq_pos(req); + u32 count = blk_rq_sectors(req); + + dev_dbg(&skdev->pdev->dev, "skreq=%p event='%s'\n", skreq, event); + dev_dbg(&skdev->pdev->dev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n", + skd_skreq_state_to_str(skreq->state), skreq->state, skreq->id, + skreq->fitmsg_id); + dev_dbg(&skdev->pdev->dev, " sg_dir=%d n_sg=%d\n", + skreq->data_dir, skreq->n_sg); + + dev_dbg(&skdev->pdev->dev, + "req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, lba, + count, count, (int)rq_data_dir(req)); +} + +/* + ***************************************************************************** + * MODULE GLUE + ***************************************************************************** + */ + +static int __init skd_init(void) +{ + BUILD_BUG_ON(sizeof(struct fit_completion_entry_v1) != 8); + BUILD_BUG_ON(sizeof(struct fit_comp_error_info) != 32); + BUILD_BUG_ON(sizeof(struct skd_command_header) != 16); + BUILD_BUG_ON(sizeof(struct skd_scsi_request) != 32); + BUILD_BUG_ON(sizeof(struct driver_inquiry_data) != 44); + BUILD_BUG_ON(offsetof(struct skd_msg_buf, fmh) != 0); + BUILD_BUG_ON(offsetof(struct skd_msg_buf, scsi) != 64); + BUILD_BUG_ON(sizeof(struct skd_msg_buf) != SKD_N_FITMSG_BYTES); + + switch (skd_isr_type) { + case SKD_IRQ_LEGACY: + case SKD_IRQ_MSI: + case SKD_IRQ_MSIX: + break; + default: + pr_err(PFX "skd_isr_type %d invalid, re-set to %d\n", + skd_isr_type, SKD_IRQ_DEFAULT); + skd_isr_type = SKD_IRQ_DEFAULT; + } + + if (skd_max_queue_depth < 1 || + skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) { + pr_err(PFX "skd_max_queue_depth %d invalid, re-set to %d\n", + skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT); + skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT; + } + + if (skd_max_req_per_msg < 1 || + skd_max_req_per_msg > SKD_MAX_REQ_PER_MSG) { + pr_err(PFX "skd_max_req_per_msg %d invalid, re-set to %d\n", + skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT); + skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT; + } + + if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) { + pr_err(PFX "skd_sg_per_request %d invalid, re-set to %d\n", + skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT); + skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT; + } + + if (skd_dbg_level < 0 || skd_dbg_level > 2) { + pr_err(PFX "skd_dbg_level %d invalid, re-set to %d\n", + skd_dbg_level, 0); + skd_dbg_level = 0; + } + + if (skd_isr_comp_limit < 0) { + pr_err(PFX "skd_isr_comp_limit %d invalid, set to %d\n", + skd_isr_comp_limit, 0); + skd_isr_comp_limit = 0; + } + + return pci_register_driver(&skd_driver); +} + +static void __exit skd_exit(void) +{ + pci_unregister_driver(&skd_driver); + + if (skd_major) + unregister_blkdev(skd_major, DRV_NAME); +} + +module_init(skd_init); +module_exit(skd_exit); |