diff options
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index ac8f31328632..43b96ab6384c 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -4402,6 +4402,8 @@ static void setup_inject(struct sdebug_queue *sqp, sqcp->inj_cmd_abort = !!(SDEBUG_OPT_CMD_ABORT & sdebug_opts); } +#define INCLUSIVE_TIMING_MAX_NS 1000000 /* 1 millisecond */ + /* Complete the processing of the thread that queued a SCSI command to this * driver. It either completes the command by calling cmnd_done() or * schedules a hr timer or work queue then returns 0. Returns @@ -4413,8 +4415,10 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, struct sdebug_dev_info *), int delta_jiff, int ndelay) { - unsigned long iflags; + bool new_sd_dp; int k, num_in_q, qdepth, inject; + unsigned long iflags; + u64 ns_from_boot = 0; struct sdebug_queue *sqp; struct sdebug_queued_cmd *sqcp; struct scsi_device *sdp; @@ -4430,7 +4434,6 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, if (delta_jiff == 0) goto respond_in_thread; - /* schedule the response at a later time if resources permit */ sqp = get_queue(cmnd); spin_lock_irqsave(&sqp->qc_lock, iflags); if (unlikely(atomic_read(&sqp->blocked))) { @@ -4489,8 +4492,15 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, sd_dp = kzalloc(sizeof(*sd_dp), GFP_ATOMIC); if (sd_dp == NULL) return SCSI_MLQUEUE_HOST_BUSY; + new_sd_dp = true; + } else { + new_sd_dp = false; } + if (ndelay > 0 && ndelay < INCLUSIVE_TIMING_MAX_NS) + ns_from_boot = ktime_get_boottime_ns(); + + /* one of the resp_*() response functions is called here */ cmnd->result = pfp != NULL ? pfp(cmnd, devip) : 0; if (cmnd->result & SDEG_RES_IMMED_MASK) { cmnd->result &= ~SDEG_RES_IMMED_MASK; @@ -4521,6 +4531,22 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, } else { /* ndelay has a 4.2 second max */ kt = sdebug_random ? prandom_u32_max((u32)ndelay) : (u32)ndelay; + if (ndelay < INCLUSIVE_TIMING_MAX_NS) { + u64 d = ktime_get_boottime_ns() - ns_from_boot; + + if (kt <= d) { /* elapsed duration >= kt */ + sqcp->a_cmnd = NULL; + atomic_dec(&devip->num_in_q); + clear_bit(k, sqp->in_use_bm); + if (new_sd_dp) + kfree(sd_dp); + /* call scsi_done() from this thread */ + cmnd->scsi_done(cmnd); + return 0; + } + /* otherwise reduce kt by elapsed time */ + kt -= d; + } } if (!sd_dp->init_hrt) { sd_dp->init_hrt = true; @@ -4534,6 +4560,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, 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) { |