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path: root/drivers/scsi/scsi_debug.c
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Diffstat (limited to 'drivers/scsi/scsi_debug.c')
-rw-r--r--drivers/scsi/scsi_debug.c229
1 files changed, 200 insertions, 29 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 3cdeaeb92933..70165be10f00 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -322,17 +322,19 @@ struct sdeb_store_info {
container_of(d, struct sdebug_host_info, dev)
enum sdeb_defer_type {SDEB_DEFER_NONE = 0, SDEB_DEFER_HRT = 1,
- SDEB_DEFER_WQ = 2};
+ SDEB_DEFER_WQ = 2, SDEB_DEFER_POLL = 3};
struct sdebug_defer {
struct hrtimer hrt;
struct execute_work ew;
+ ktime_t cmpl_ts;/* time since boot to complete this cmd */
int sqa_idx; /* index of sdebug_queue array */
int qc_idx; /* index of sdebug_queued_cmd array within sqa_idx */
int hc_idx; /* hostwide tag index */
int issuing_cpu;
bool init_hrt;
bool init_wq;
+ bool init_poll;
bool aborted; /* true when blk_abort_request() already called */
enum sdeb_defer_type defer_t;
};
@@ -357,6 +359,7 @@ static atomic_t sdebug_completions; /* count of deferred completions */
static atomic_t sdebug_miss_cpus; /* submission + completion cpus differ */
static atomic_t sdebug_a_tsf; /* 'almost task set full' counter */
static atomic_t sdeb_inject_pending;
+static atomic_t sdeb_mq_poll_count; /* bumped when mq_poll returns > 0 */
struct opcode_info_t {
u8 num_attached; /* 0 if this is it (i.e. a leaf); use 0xff */
@@ -829,6 +832,7 @@ static int sdeb_zbc_max_open = DEF_ZBC_MAX_OPEN_ZONES;
static int sdeb_zbc_nr_conv = DEF_ZBC_NR_CONV_ZONES;
static int submit_queues = DEF_SUBMIT_QUEUES; /* > 1 for multi-queue (mq) */
+static int poll_queues; /* iouring iopoll interface.*/
static struct sdebug_queue *sdebug_q_arr; /* ptr to array of submit queues */
static DEFINE_RWLOCK(atomic_rw);
@@ -4729,7 +4733,6 @@ static void sdebug_q_cmd_complete(struct sdebug_defer *sd_dp)
struct scsi_cmnd *scp;
struct sdebug_dev_info *devip;
- sd_dp->defer_t = SDEB_DEFER_NONE;
if (unlikely(aborted))
sd_dp->aborted = false;
qc_idx = sd_dp->qc_idx;
@@ -4744,6 +4747,7 @@ static void sdebug_q_cmd_complete(struct sdebug_defer *sd_dp)
return;
}
spin_lock_irqsave(&sqp->qc_lock, iflags);
+ sd_dp->defer_t = SDEB_DEFER_NONE;
sqcp = &sqp->qc_arr[qc_idx];
scp = sqcp->a_cmnd;
if (unlikely(scp == NULL)) {
@@ -5363,6 +5367,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
{
bool new_sd_dp;
bool inject = false;
+ bool hipri = (cmnd->request->cmd_flags & REQ_HIPRI);
int k, num_in_q, qdepth;
unsigned long iflags;
u64 ns_from_boot = 0;
@@ -5432,6 +5437,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
cmnd->host_scribble = (unsigned char *)sqcp;
sd_dp = sqcp->sd_dp;
spin_unlock_irqrestore(&sqp->qc_lock, iflags);
+
if (!sd_dp) {
sd_dp = kzalloc(sizeof(*sd_dp), GFP_ATOMIC);
if (!sd_dp) {
@@ -5448,7 +5454,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
if (sdebug_host_max_queue)
sd_dp->hc_idx = get_tag(cmnd);
- if (ndelay > 0 && ndelay < INCLUSIVE_TIMING_MAX_NS)
+ if (hipri)
ns_from_boot = ktime_get_boottime_ns();
/* one of the resp_*() response functions is called here */
@@ -5508,40 +5514,66 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
kt -= d;
}
}
- if (!sd_dp->init_hrt) {
- sd_dp->init_hrt = true;
- sqcp->sd_dp = sd_dp;
- hrtimer_init(&sd_dp->hrt, CLOCK_MONOTONIC,
- HRTIMER_MODE_REL_PINNED);
- sd_dp->hrt.function = sdebug_q_cmd_hrt_complete;
- sd_dp->sqa_idx = sqp - sdebug_q_arr;
- sd_dp->qc_idx = k;
+ if (hipri) {
+ sd_dp->cmpl_ts = ktime_add(ns_to_ktime(ns_from_boot), kt);
+ spin_lock_irqsave(&sqp->qc_lock, iflags);
+ if (!sd_dp->init_poll) {
+ sd_dp->init_poll = true;
+ sqcp->sd_dp = sd_dp;
+ sd_dp->sqa_idx = sqp - sdebug_q_arr;
+ sd_dp->qc_idx = k;
+ }
+ sd_dp->defer_t = SDEB_DEFER_POLL;
+ spin_unlock_irqrestore(&sqp->qc_lock, iflags);
+ } else {
+ if (!sd_dp->init_hrt) {
+ sd_dp->init_hrt = true;
+ sqcp->sd_dp = sd_dp;
+ hrtimer_init(&sd_dp->hrt, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL_PINNED);
+ sd_dp->hrt.function = sdebug_q_cmd_hrt_complete;
+ sd_dp->sqa_idx = sqp - sdebug_q_arr;
+ sd_dp->qc_idx = k;
+ }
+ sd_dp->defer_t = SDEB_DEFER_HRT;
+ /* schedule the invocation of scsi_done() for a later time */
+ hrtimer_start(&sd_dp->hrt, kt, HRTIMER_MODE_REL_PINNED);
}
if (sdebug_statistics)
sd_dp->issuing_cpu = raw_smp_processor_id();
- sd_dp->defer_t = SDEB_DEFER_HRT;
- /* schedule the invocation of scsi_done() for a later time */
- hrtimer_start(&sd_dp->hrt, kt, HRTIMER_MODE_REL_PINNED);
} else { /* jdelay < 0, use work queue */
- if (!sd_dp->init_wq) {
- sd_dp->init_wq = true;
- sqcp->sd_dp = sd_dp;
- sd_dp->sqa_idx = sqp - sdebug_q_arr;
- sd_dp->qc_idx = k;
- INIT_WORK(&sd_dp->ew.work, sdebug_q_cmd_wq_complete);
- }
- if (sdebug_statistics)
- sd_dp->issuing_cpu = raw_smp_processor_id();
- sd_dp->defer_t = SDEB_DEFER_WQ;
if (unlikely((sdebug_opts & SDEBUG_OPT_CMD_ABORT) &&
atomic_read(&sdeb_inject_pending)))
sd_dp->aborted = true;
- schedule_work(&sd_dp->ew.work);
- if (unlikely((sdebug_opts & SDEBUG_OPT_CMD_ABORT) &&
- atomic_read(&sdeb_inject_pending))) {
+ if (hipri) {
+ sd_dp->cmpl_ts = ns_to_ktime(ns_from_boot);
+ spin_lock_irqsave(&sqp->qc_lock, iflags);
+ if (!sd_dp->init_poll) {
+ sd_dp->init_poll = true;
+ sqcp->sd_dp = sd_dp;
+ sd_dp->sqa_idx = sqp - sdebug_q_arr;
+ sd_dp->qc_idx = k;
+ }
+ sd_dp->defer_t = SDEB_DEFER_POLL;
+ spin_unlock_irqrestore(&sqp->qc_lock, iflags);
+ } else {
+ if (!sd_dp->init_wq) {
+ sd_dp->init_wq = true;
+ sqcp->sd_dp = sd_dp;
+ sd_dp->sqa_idx = sqp - sdebug_q_arr;
+ sd_dp->qc_idx = k;
+ INIT_WORK(&sd_dp->ew.work, sdebug_q_cmd_wq_complete);
+ }
+ sd_dp->defer_t = SDEB_DEFER_WQ;
+ schedule_work(&sd_dp->ew.work);
+ }
+ if (sdebug_statistics)
+ sd_dp->issuing_cpu = raw_smp_processor_id();
+ if (unlikely(sd_dp->aborted)) {
sdev_printk(KERN_INFO, sdp, "abort request tag %d\n", cmnd->request->tag);
blk_abort_request(cmnd->request);
atomic_set(&sdeb_inject_pending, 0);
+ sd_dp->aborted = false;
}
}
if (unlikely((SDEBUG_OPT_Q_NOISE & sdebug_opts) && scsi_result == device_qfull_result))
@@ -5615,6 +5647,7 @@ module_param_named(sector_size, sdebug_sector_size, int, S_IRUGO);
module_param_named(statistics, sdebug_statistics, bool, S_IRUGO | S_IWUSR);
module_param_named(strict, sdebug_strict, bool, S_IRUGO | S_IWUSR);
module_param_named(submit_queues, submit_queues, int, S_IRUGO);
+module_param_named(poll_queues, poll_queues, int, S_IRUGO);
module_param_named(tur_ms_to_ready, sdeb_tur_ms_to_ready, int, S_IRUGO);
module_param_named(unmap_alignment, sdebug_unmap_alignment, int, S_IRUGO);
module_param_named(unmap_granularity, sdebug_unmap_granularity, int, S_IRUGO);
@@ -5677,6 +5710,7 @@ MODULE_PARM_DESC(opt_xferlen_exp, "optimal transfer length granularity exponent
MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
MODULE_PARM_DESC(per_host_store, "If set, next positive add_host will get new store (def=0)");
MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
+MODULE_PARM_DESC(poll_queues, "support for iouring iopoll queues (1 to max(submit_queues - 1)");
MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
MODULE_PARM_DESC(random, "If set, uniformly randomize command duration between 0 and delay_in_ns");
MODULE_PARM_DESC(removable, "claim to have removable media (def=0)");
@@ -5768,11 +5802,12 @@ static int scsi_debug_show_info(struct seq_file *m, struct Scsi_Host *host)
dix_reads, dix_writes, dif_errors);
seq_printf(m, "usec_in_jiffy=%lu, statistics=%d\n", TICK_NSEC / 1000,
sdebug_statistics);
- seq_printf(m, "cmnd_count=%d, completions=%d, %s=%d, a_tsf=%d\n",
+ seq_printf(m, "cmnd_count=%d, completions=%d, %s=%d, a_tsf=%d, mq_polls=%d\n",
atomic_read(&sdebug_cmnd_count),
atomic_read(&sdebug_completions),
"miss_cpus", atomic_read(&sdebug_miss_cpus),
- atomic_read(&sdebug_a_tsf));
+ atomic_read(&sdebug_a_tsf),
+ atomic_read(&sdeb_mq_poll_count));
seq_printf(m, "submit_queues=%d\n", submit_queues);
for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) {
@@ -7202,6 +7237,121 @@ static int resp_not_ready(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
return check_condition_result;
}
+static int sdebug_map_queues(struct Scsi_Host *shost)
+{
+ int i, qoff;
+
+ if (shost->nr_hw_queues == 1)
+ return 0;
+
+ for (i = 0, qoff = 0; i < HCTX_MAX_TYPES; i++) {
+ struct blk_mq_queue_map *map = &shost->tag_set.map[i];
+
+ map->nr_queues = 0;
+
+ if (i == HCTX_TYPE_DEFAULT)
+ map->nr_queues = submit_queues - poll_queues;
+ else if (i == HCTX_TYPE_POLL)
+ map->nr_queues = poll_queues;
+
+ if (!map->nr_queues) {
+ BUG_ON(i == HCTX_TYPE_DEFAULT);
+ continue;
+ }
+
+ map->queue_offset = qoff;
+ blk_mq_map_queues(map);
+
+ qoff += map->nr_queues;
+ }
+
+ return 0;
+
+}
+
+static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num)
+{
+ bool first;
+ bool retiring = false;
+ int num_entries = 0;
+ unsigned int qc_idx = 0;
+ unsigned long iflags;
+ ktime_t kt_from_boot = ktime_get_boottime();
+ struct sdebug_queue *sqp;
+ struct sdebug_queued_cmd *sqcp;
+ struct scsi_cmnd *scp;
+ struct sdebug_dev_info *devip;
+ struct sdebug_defer *sd_dp;
+
+ sqp = sdebug_q_arr + queue_num;
+ spin_lock_irqsave(&sqp->qc_lock, iflags);
+
+ for (first = true; first || qc_idx + 1 < sdebug_max_queue; ) {
+ if (first) {
+ qc_idx = find_first_bit(sqp->in_use_bm, sdebug_max_queue);
+ first = false;
+ } else {
+ qc_idx = find_next_bit(sqp->in_use_bm, sdebug_max_queue, qc_idx + 1);
+ }
+ if (unlikely(qc_idx >= sdebug_max_queue))
+ break;
+
+ sqcp = &sqp->qc_arr[qc_idx];
+ sd_dp = sqcp->sd_dp;
+ if (unlikely(!sd_dp))
+ continue;
+ scp = sqcp->a_cmnd;
+ if (unlikely(scp == NULL)) {
+ pr_err("scp is NULL, queue_num=%d, qc_idx=%u from %s\n",
+ queue_num, qc_idx, __func__);
+ break;
+ }
+ if (sd_dp->defer_t == SDEB_DEFER_POLL) {
+ if (kt_from_boot < sd_dp->cmpl_ts)
+ continue;
+
+ } else /* ignoring non REQ_HIPRI requests */
+ continue;
+ devip = (struct sdebug_dev_info *)scp->device->hostdata;
+ if (likely(devip))
+ atomic_dec(&devip->num_in_q);
+ else
+ pr_err("devip=NULL from %s\n", __func__);
+ if (unlikely(atomic_read(&retired_max_queue) > 0))
+ retiring = true;
+
+ sqcp->a_cmnd = NULL;
+ if (unlikely(!test_and_clear_bit(qc_idx, sqp->in_use_bm))) {
+ pr_err("Unexpected completion sqp %p queue_num=%d qc_idx=%u from %s\n",
+ sqp, queue_num, qc_idx, __func__);
+ break;
+ }
+ if (unlikely(retiring)) { /* user has reduced max_queue */
+ int k, retval;
+
+ retval = atomic_read(&retired_max_queue);
+ if (qc_idx >= retval) {
+ pr_err("index %d too large\n", retval);
+ break;
+ }
+ k = find_last_bit(sqp->in_use_bm, retval);
+ if ((k < sdebug_max_queue) || (k == retval))
+ atomic_set(&retired_max_queue, 0);
+ else
+ atomic_set(&retired_max_queue, k + 1);
+ }
+ sd_dp->defer_t = SDEB_DEFER_NONE;
+ spin_unlock_irqrestore(&sqp->qc_lock, iflags);
+ scp->scsi_done(scp); /* callback to mid level */
+ spin_lock_irqsave(&sqp->qc_lock, iflags);
+ num_entries++;
+ }
+ spin_unlock_irqrestore(&sqp->qc_lock, iflags);
+ if (num_entries > 0)
+ atomic_add(num_entries, &sdeb_mq_poll_count);
+ return num_entries;
+}
+
static int scsi_debug_queuecommand(struct Scsi_Host *shost,
struct scsi_cmnd *scp)
{
@@ -7381,6 +7531,8 @@ static struct scsi_host_template sdebug_driver_template = {
.ioctl = scsi_debug_ioctl,
.queuecommand = scsi_debug_queuecommand,
.change_queue_depth = sdebug_change_qdepth,
+ .map_queues = sdebug_map_queues,
+ .mq_poll = sdebug_blk_mq_poll,
.eh_abort_handler = scsi_debug_abort,
.eh_device_reset_handler = scsi_debug_device_reset,
.eh_target_reset_handler = scsi_debug_target_reset,
@@ -7428,6 +7580,25 @@ static int sdebug_driver_probe(struct device *dev)
if (sdebug_host_max_queue)
hpnt->host_tagset = 1;
+ /* poll queues are possible for nr_hw_queues > 1 */
+ if (hpnt->nr_hw_queues == 1 || (poll_queues < 1)) {
+ pr_warn("%s: trim poll_queues to 0. poll_q/nr_hw = (%d/%d)\n",
+ my_name, poll_queues, hpnt->nr_hw_queues);
+ poll_queues = 0;
+ }
+
+ /*
+ * Poll queues don't need interrupts, but we need at least one I/O queue
+ * left over for non-polled I/O.
+ * If condition not met, trim poll_queues to 1 (just for simplicity).
+ */
+ if (poll_queues >= submit_queues) {
+ pr_warn("%s: trim poll_queues to 1\n", my_name);
+ poll_queues = 1;
+ }
+ if (poll_queues)
+ hpnt->nr_maps = 3;
+
sdbg_host->shost = hpnt;
*((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
if ((hpnt->this_id >= 0) && (sdebug_num_tgts > hpnt->this_id))
generated by cgit v1.2.3 (git 2.39.0) at 2025-10-31 14:52:14 +0300