diff options
Diffstat (limited to 'drivers/s390/cio/qdio.h')
| -rw-r--r-- | drivers/s390/cio/qdio.h | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h new file mode 100644 index 000000000..ed60b8d4e --- /dev/null +++ b/drivers/s390/cio/qdio.h @@ -0,0 +1,418 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright IBM Corp. 2000, 2009 + * Author(s): Utz Bacher <utz.bacher@de.ibm.com> + * Jan Glauber <jang@linux.vnet.ibm.com> + */ +#ifndef _CIO_QDIO_H +#define _CIO_QDIO_H + +#include <asm/page.h> +#include <asm/schid.h> +#include <asm/debug.h> +#include "chsc.h" + +#define QDIO_BUSY_BIT_PATIENCE (100 << 12) /* 100 microseconds */ +#define QDIO_BUSY_BIT_RETRY_DELAY 10 /* 10 milliseconds */ +#define QDIO_BUSY_BIT_RETRIES 1000 /* = 10s retry time */ +#define QDIO_INPUT_THRESHOLD (500 << 12) /* 500 microseconds */ + +enum qdio_irq_states { + QDIO_IRQ_STATE_INACTIVE, + QDIO_IRQ_STATE_ESTABLISHED, + QDIO_IRQ_STATE_ACTIVE, + QDIO_IRQ_STATE_STOPPED, + QDIO_IRQ_STATE_CLEANUP, + QDIO_IRQ_STATE_ERR, + NR_QDIO_IRQ_STATES, +}; + +/* used as intparm in do_IO */ +#define QDIO_DOING_ESTABLISH 1 +#define QDIO_DOING_ACTIVATE 2 +#define QDIO_DOING_CLEANUP 3 + +#define SLSB_STATE_NOT_INIT 0x0 +#define SLSB_STATE_EMPTY 0x1 +#define SLSB_STATE_PRIMED 0x2 +#define SLSB_STATE_PENDING 0x3 +#define SLSB_STATE_HALTED 0xe +#define SLSB_STATE_ERROR 0xf +#define SLSB_TYPE_INPUT 0x0 +#define SLSB_TYPE_OUTPUT 0x20 +#define SLSB_OWNER_PROG 0x80 +#define SLSB_OWNER_CU 0x40 + +#define SLSB_P_INPUT_NOT_INIT \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_NOT_INIT) /* 0x80 */ +#define SLSB_P_INPUT_ACK \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x81 */ +#define SLSB_CU_INPUT_EMPTY \ + (SLSB_OWNER_CU | SLSB_TYPE_INPUT | SLSB_STATE_EMPTY) /* 0x41 */ +#define SLSB_P_INPUT_PRIMED \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_PRIMED) /* 0x82 */ +#define SLSB_P_INPUT_HALTED \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_HALTED) /* 0x8e */ +#define SLSB_P_INPUT_ERROR \ + (SLSB_OWNER_PROG | SLSB_TYPE_INPUT | SLSB_STATE_ERROR) /* 0x8f */ +#define SLSB_P_OUTPUT_NOT_INIT \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_NOT_INIT) /* 0xa0 */ +#define SLSB_P_OUTPUT_EMPTY \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_EMPTY) /* 0xa1 */ +#define SLSB_P_OUTPUT_PENDING \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_PENDING) /* 0xa3 */ +#define SLSB_CU_OUTPUT_PRIMED \ + (SLSB_OWNER_CU | SLSB_TYPE_OUTPUT | SLSB_STATE_PRIMED) /* 0x62 */ +#define SLSB_P_OUTPUT_HALTED \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_HALTED) /* 0xae */ +#define SLSB_P_OUTPUT_ERROR \ + (SLSB_OWNER_PROG | SLSB_TYPE_OUTPUT | SLSB_STATE_ERROR) /* 0xaf */ + +#define SLSB_ERROR_DURING_LOOKUP 0xff + +/* additional CIWs returned by extended Sense-ID */ +#define CIW_TYPE_EQUEUE 0x3 /* establish QDIO queues */ +#define CIW_TYPE_AQUEUE 0x4 /* activate QDIO queues */ + +/* flags for st qdio sch data */ +#define CHSC_FLAG_QDIO_CAPABILITY 0x80 +#define CHSC_FLAG_VALIDITY 0x40 + +/* SIGA flags */ +#define QDIO_SIGA_WRITE 0x00 +#define QDIO_SIGA_READ 0x01 +#define QDIO_SIGA_SYNC 0x02 +#define QDIO_SIGA_WRITEQ 0x04 +#define QDIO_SIGA_QEBSM_FLAG 0x80 + +static inline int do_sqbs(u64 token, unsigned char state, int queue, + int *start, int *count) +{ + register unsigned long _ccq asm ("0") = *count; + register unsigned long _token asm ("1") = token; + unsigned long _queuestart = ((unsigned long)queue << 32) | *start; + + asm volatile( + " .insn rsy,0xeb000000008A,%1,0,0(%2)" + : "+d" (_ccq), "+d" (_queuestart) + : "d" ((unsigned long)state), "d" (_token) + : "memory", "cc"); + *count = _ccq & 0xff; + *start = _queuestart & 0xff; + + return (_ccq >> 32) & 0xff; +} + +static inline int do_eqbs(u64 token, unsigned char *state, int queue, + int *start, int *count, int ack) +{ + register unsigned long _ccq asm ("0") = *count; + register unsigned long _token asm ("1") = token; + unsigned long _queuestart = ((unsigned long)queue << 32) | *start; + unsigned long _state = (unsigned long)ack << 63; + + asm volatile( + " .insn rrf,0xB99c0000,%1,%2,0,0" + : "+d" (_ccq), "+d" (_queuestart), "+d" (_state) + : "d" (_token) + : "memory", "cc"); + *count = _ccq & 0xff; + *start = _queuestart & 0xff; + *state = _state & 0xff; + + return (_ccq >> 32) & 0xff; +} + +struct qdio_irq; + +struct siga_flag { + u8 input:1; + u8 output:1; + u8 sync:1; + u8 sync_after_ai:1; + u8 sync_out_after_pci:1; + u8:3; +} __attribute__ ((packed)); + +struct qdio_dev_perf_stat { + unsigned int adapter_int; + unsigned int qdio_int; + unsigned int pci_request_int; + + unsigned int tasklet_inbound; + unsigned int tasklet_inbound_resched; + unsigned int tasklet_inbound_resched2; + unsigned int tasklet_outbound; + + unsigned int siga_read; + unsigned int siga_write; + unsigned int siga_sync; + + unsigned int inbound_call; + unsigned int inbound_handler; + unsigned int stop_polling; + unsigned int inbound_queue_full; + unsigned int outbound_call; + unsigned int outbound_handler; + unsigned int outbound_queue_full; + unsigned int fast_requeue; + unsigned int target_full; + unsigned int eqbs; + unsigned int eqbs_partial; + unsigned int sqbs; + unsigned int sqbs_partial; + unsigned int int_discarded; +} ____cacheline_aligned; + +struct qdio_queue_perf_stat { + /* + * Sorted into order-2 buckets: 1, 2-3, 4-7, ... 64-127, 128. + * Since max. 127 SBALs are scanned reuse entry for 128 as queue full + * aka 127 SBALs found. + */ + unsigned int nr_sbals[8]; + unsigned int nr_sbal_error; + unsigned int nr_sbal_nop; + unsigned int nr_sbal_total; +}; + +enum qdio_queue_irq_states { + QDIO_QUEUE_IRQS_DISABLED, +}; + +struct qdio_input_q { + /* input buffer acknowledgement flag */ + int polling; + /* first ACK'ed buffer */ + int ack_start; + /* how much sbals are acknowledged with qebsm */ + int ack_count; + /* last time of noticing incoming data */ + u64 timestamp; + /* upper-layer polling flag */ + unsigned long queue_irq_state; + /* callback to start upper-layer polling */ + void (*queue_start_poll) (struct ccw_device *, int, unsigned long); +}; + +struct qdio_output_q { + /* PCIs are enabled for the queue */ + int pci_out_enabled; + /* cq: use asynchronous output buffers */ + int use_cq; + /* cq: aobs used for particual SBAL */ + struct qaob **aobs; + /* cq: sbal state related to asynchronous operation */ + struct qdio_outbuf_state *sbal_state; + /* timer to check for more outbound work */ + struct timer_list timer; + /* used SBALs before tasklet schedule */ + int scan_threshold; +}; + +/* + * Note on cache alignment: grouped slsb and write mostly data at the beginning + * sbal[] is read-only and starts on a new cacheline followed by read mostly. + */ +struct qdio_q { + struct slsb slsb; + + union { + struct qdio_input_q in; + struct qdio_output_q out; + } u; + + /* + * inbound: next buffer the program should check for + * outbound: next buffer to check if adapter processed it + */ + int first_to_check; + + /* first_to_check of the last time */ + int last_move; + + /* beginning position for calling the program */ + int first_to_kick; + + /* number of buffers in use by the adapter */ + atomic_t nr_buf_used; + + /* error condition during a data transfer */ + unsigned int qdio_error; + + /* last scan of the queue */ + u64 timestamp; + + struct tasklet_struct tasklet; + struct qdio_queue_perf_stat q_stats; + + struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q] ____cacheline_aligned; + + /* queue number */ + int nr; + + /* bitmask of queue number */ + int mask; + + /* input or output queue */ + int is_input_q; + + /* list of thinint input queues */ + struct list_head entry; + + /* upper-layer program handler */ + qdio_handler_t (*handler); + + struct dentry *debugfs_q; + struct qdio_irq *irq_ptr; + struct sl *sl; + /* + * A page is allocated under this pointer and used for slib and sl. + * slib is 2048 bytes big and sl points to offset PAGE_SIZE / 2. + */ + struct slib *slib; +} __attribute__ ((aligned(256))); + +struct qdio_irq { + struct qib qib; + u32 *dsci; /* address of device state change indicator */ + struct ccw_device *cdev; + struct dentry *debugfs_dev; + struct dentry *debugfs_perf; + + unsigned long int_parm; + struct subchannel_id schid; + unsigned long sch_token; /* QEBSM facility */ + + enum qdio_irq_states state; + + struct siga_flag siga_flag; /* siga sync information from qdioac */ + + int nr_input_qs; + int nr_output_qs; + + struct ccw1 ccw; + struct ciw equeue; + struct ciw aqueue; + + struct qdio_ssqd_desc ssqd_desc; + void (*orig_handler) (struct ccw_device *, unsigned long, struct irb *); + + int perf_stat_enabled; + + struct qdr *qdr; + unsigned long chsc_page; + + struct qdio_q *input_qs[QDIO_MAX_QUEUES_PER_IRQ]; + struct qdio_q *output_qs[QDIO_MAX_QUEUES_PER_IRQ]; + + debug_info_t *debug_area; + struct mutex setup_mutex; + struct qdio_dev_perf_stat perf_stat; +}; + +/* helper functions */ +#define queue_type(q) q->irq_ptr->qib.qfmt +#define SCH_NO(q) (q->irq_ptr->schid.sch_no) + +#define is_thinint_irq(irq) \ + (irq->qib.qfmt == QDIO_IQDIO_QFMT || \ + css_general_characteristics.aif_osa) + +#define qperf(__qdev, __attr) ((__qdev)->perf_stat.(__attr)) + +#define qperf_inc(__q, __attr) \ +({ \ + struct qdio_irq *qdev = (__q)->irq_ptr; \ + if (qdev->perf_stat_enabled) \ + (qdev->perf_stat.__attr)++; \ +}) + +static inline void account_sbals_error(struct qdio_q *q, int count) +{ + q->q_stats.nr_sbal_error += count; + q->q_stats.nr_sbal_total += count; +} + +/* the highest iqdio queue is used for multicast */ +static inline int multicast_outbound(struct qdio_q *q) +{ + return (q->irq_ptr->nr_output_qs > 1) && + (q->nr == q->irq_ptr->nr_output_qs - 1); +} + +#define pci_out_supported(q) \ + (q->irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED) +#define is_qebsm(q) (q->irq_ptr->sch_token != 0) + +#define need_siga_in(q) (q->irq_ptr->siga_flag.input) +#define need_siga_out(q) (q->irq_ptr->siga_flag.output) +#define need_siga_sync(q) (unlikely(q->irq_ptr->siga_flag.sync)) +#define need_siga_sync_after_ai(q) \ + (unlikely(q->irq_ptr->siga_flag.sync_after_ai)) +#define need_siga_sync_out_after_pci(q) \ + (unlikely(q->irq_ptr->siga_flag.sync_out_after_pci)) + +#define for_each_input_queue(irq_ptr, q, i) \ + for (i = 0; i < irq_ptr->nr_input_qs && \ + ({ q = irq_ptr->input_qs[i]; 1; }); i++) +#define for_each_output_queue(irq_ptr, q, i) \ + for (i = 0; i < irq_ptr->nr_output_qs && \ + ({ q = irq_ptr->output_qs[i]; 1; }); i++) + +#define prev_buf(bufnr) \ + ((bufnr + QDIO_MAX_BUFFERS_MASK) & QDIO_MAX_BUFFERS_MASK) +#define next_buf(bufnr) \ + ((bufnr + 1) & QDIO_MAX_BUFFERS_MASK) +#define add_buf(bufnr, inc) \ + ((bufnr + inc) & QDIO_MAX_BUFFERS_MASK) +#define sub_buf(bufnr, dec) \ + ((bufnr - dec) & QDIO_MAX_BUFFERS_MASK) + +#define queue_irqs_enabled(q) \ + (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) == 0) +#define queue_irqs_disabled(q) \ + (test_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state) != 0) + +extern u64 last_ai_time; + +/* prototypes for thin interrupt */ +int qdio_establish_thinint(struct qdio_irq *irq_ptr); +void qdio_shutdown_thinint(struct qdio_irq *irq_ptr); +void tiqdio_add_input_queues(struct qdio_irq *irq_ptr); +void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr); +void tiqdio_inbound_processing(unsigned long q); +int tiqdio_allocate_memory(void); +void tiqdio_free_memory(void); +int tiqdio_register_thinints(void); +void tiqdio_unregister_thinints(void); +void clear_nonshared_ind(struct qdio_irq *); +int test_nonshared_ind(struct qdio_irq *); + +/* prototypes for setup */ +void qdio_inbound_processing(unsigned long data); +void qdio_outbound_processing(unsigned long data); +void qdio_outbound_timer(struct timer_list *t); +void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm, + struct irb *irb); +int qdio_allocate_qs(struct qdio_irq *irq_ptr, int nr_input_qs, + int nr_output_qs); +void qdio_setup_ssqd_info(struct qdio_irq *irq_ptr); +int qdio_setup_get_ssqd(struct qdio_irq *irq_ptr, + struct subchannel_id *schid, + struct qdio_ssqd_desc *data); +int qdio_setup_irq(struct qdio_initialize *init_data); +void qdio_print_subchannel_info(struct qdio_irq *irq_ptr, + struct ccw_device *cdev); +void qdio_release_memory(struct qdio_irq *irq_ptr); +int qdio_setup_create_sysfs(struct ccw_device *cdev); +void qdio_setup_destroy_sysfs(struct ccw_device *cdev); +int qdio_setup_init(void); +void qdio_setup_exit(void); +int qdio_enable_async_operation(struct qdio_output_q *q); +void qdio_disable_async_operation(struct qdio_output_q *q); +struct qaob *qdio_allocate_aob(void); + +int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr, + unsigned char *state); +#endif /* _CIO_QDIO_H */ |