From b333a819813c756804034c93b05e43ccdd4025a5 Mon Sep 17 00:00:00 2001 From: Douglas Gilbert Date: Mon, 25 Apr 2016 12:16:30 -0400 Subject: [PATCH] scsi_debug: replace jiffy timers with hr timers The driver supports two command delay interfaces, the original one whose unit is a jiffy, and a newer one whose unit is a nanosecond. Each had different implementations. Keep both interfaces but simplify the implemenation to use a single delay mechanism based on high resolution timers. Signed-off-by: Douglas Gilbert Reviewed-by: Hannes Reinicke Signed-off-by: Martin K. Petersen --- drivers/scsi/scsi_debug.c | 56 ++++++++++++++++++----------------------------- 1 file changed, 21 insertions(+), 35 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 88bfe0fb72ee..90cd62e03337 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -24,7 +24,7 @@ #include #include -#include +#include #include #include #include @@ -518,7 +518,7 @@ struct sdebug_scmd_extra_t { static int sdebug_add_host = DEF_NUM_HOST; static int sdebug_ato = DEF_ATO; -static int sdebug_delay = DEF_DELAY; +static int sdebug_delay = DEF_DELAY; /* in jiffies */ static int sdebug_dev_size_mb = DEF_DEV_SIZE_MB; static int sdebug_dif = DEF_DIF; static int sdebug_dix = DEF_DIX; @@ -530,7 +530,7 @@ static int sdebug_lowest_aligned = DEF_LOWEST_ALIGNED; static int sdebug_max_luns = DEF_MAX_LUNS; static int sdebug_max_queue = SCSI_DEBUG_CANQUEUE; static atomic_t retired_max_queue; /* if > 0 then was prior max_queue */ -static int sdebug_ndelay = DEF_NDELAY; +static int sdebug_ndelay = DEF_NDELAY; /* in nanoseconds */ static int sdebug_no_lun_0 = DEF_NO_LUN_0; static int sdebug_no_uld; static int sdebug_num_parts = DEF_NUM_PARTS; @@ -617,7 +617,6 @@ struct sdebug_hrtimer { /* ... is derived from hrtimer */ struct sdebug_queued_cmd { /* in_use flagged by a bit in queued_in_use_bm[] */ - struct timer_list *cmnd_timerp; struct tasklet_struct *tletp; struct sdebug_hrtimer *sd_hrtp; struct scsi_cmnd * a_cmnd; @@ -3151,7 +3150,7 @@ resp_unmap(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) return check_condition_result; } - buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC); + buf = kzalloc(scsi_bufflen(scp), GFP_ATOMIC); if (!buf) { mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, INSUFF_RES_ASCQ); @@ -3298,7 +3297,7 @@ static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba, struct sg_mapping_iter miter; /* better not to use temporary buffer. */ - buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC); + buf = kzalloc(scsi_bufflen(scp), GFP_ATOMIC); if (!buf) { mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC, INSUFF_RES_ASCQ); @@ -3350,7 +3349,7 @@ resp_xdwriteread_10(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) return resp_xdwriteread(scp, lba, num, devip); } -/* When timer or tasklet goes off this function is called. */ +/* When tasklet goes off this function is called. */ static void sdebug_q_cmd_complete(unsigned long indx) { int qa_indx; @@ -3592,14 +3591,11 @@ static int stop_queued_cmnd(struct scsi_cmnd *cmnd) sqcp->a_cmnd = NULL; spin_unlock_irqrestore(&queued_arr_lock, iflags); - if (sdebug_ndelay > 0) { + if ((sdebug_delay > 0) || + (sdebug_ndelay > 0)) { if (sqcp->sd_hrtp) hrtimer_cancel( &sqcp->sd_hrtp->hrt); - } else if (sdebug_delay > 0) { - if (sqcp->cmnd_timerp) - del_timer_sync( - sqcp->cmnd_timerp); } else if (sdebug_delay < 0) { if (sqcp->tletp) tasklet_kill(sqcp->tletp); @@ -3633,14 +3629,11 @@ static void stop_all_queued(void) sqcp->a_cmnd = NULL; spin_unlock_irqrestore(&queued_arr_lock, iflags); - if (sdebug_ndelay > 0) { + if ((sdebug_delay > 0) || + (sdebug_ndelay > 0)) { if (sqcp->sd_hrtp) hrtimer_cancel( &sqcp->sd_hrtp->hrt); - } else if (sdebug_delay > 0) { - if (sqcp->cmnd_timerp) - del_timer_sync( - sqcp->cmnd_timerp); } else if (sdebug_delay < 0) { if (sqcp->tletp) tasklet_kill(sqcp->tletp); @@ -3663,8 +3656,6 @@ static void free_all_queued(void) spin_lock_irqsave(&queued_arr_lock, iflags); for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) { sqcp = &queued_arr[k]; - kfree(sqcp->cmnd_timerp); - sqcp->cmnd_timerp = NULL; kfree(sqcp->tletp); sqcp->tletp = NULL; kfree(sqcp->sd_hrtp); @@ -3921,24 +3912,19 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, sqcp->a_cmnd = cmnd; cmnd->result = scsi_result; spin_unlock_irqrestore(&queued_arr_lock, iflags); - if (delta_jiff > 0) { - if (NULL == sqcp->cmnd_timerp) { - sqcp->cmnd_timerp = kmalloc(sizeof(struct timer_list), - GFP_ATOMIC); - if (NULL == sqcp->cmnd_timerp) - return SCSI_MLQUEUE_HOST_BUSY; - init_timer(sqcp->cmnd_timerp); - } - sqcp->cmnd_timerp->function = sdebug_q_cmd_complete; - sqcp->cmnd_timerp->data = k; - sqcp->cmnd_timerp->expires = get_jiffies_64() + delta_jiff; - add_timer(sqcp->cmnd_timerp); - } else if (sdebug_ndelay > 0) { - ktime_t kt = ktime_set(0, sdebug_ndelay); + if ((delta_jiff > 0) || (sdebug_ndelay > 0)) { struct sdebug_hrtimer *sd_hp = sqcp->sd_hrtp; + ktime_t kt; + if (delta_jiff > 0) { + struct timespec ts; + + jiffies_to_timespec(delta_jiff, &ts); + kt = ktime_set(ts.tv_sec, ts.tv_nsec); + } else + kt = ktime_set(0, sdebug_ndelay); if (NULL == sd_hp) { - sd_hp = kmalloc(sizeof(*sd_hp), GFP_ATOMIC); + sd_hp = kzalloc(sizeof(*sd_hp), GFP_ATOMIC); if (NULL == sd_hp) return SCSI_MLQUEUE_HOST_BUSY; sqcp->sd_hrtp = sd_hp; @@ -3950,7 +3936,7 @@ schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip, hrtimer_start(&sd_hp->hrt, kt, HRTIMER_MODE_REL); } else { /* delay < 0 */ if (NULL == sqcp->tletp) { - sqcp->tletp = kmalloc(sizeof(*sqcp->tletp), + sqcp->tletp = kzalloc(sizeof(*sqcp->tletp), GFP_ATOMIC); if (NULL == sqcp->tletp) return SCSI_MLQUEUE_HOST_BUSY; -- 2.11.0