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drm/xe: Use usleep_range for accurate long-running workload timeslicing

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msleep is not very accurate in terms of how long it actually sleeps,
whereas usleep_range is precise. Replace the timeslice sleep for
long-running workloads with the more accurate usleep_range to avoid
jitter if the sleep period is less than 20ms.

Fixes: dd08ebf6c3 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patch.msgid.link/20251212182847.1683222-3-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2025-12-12 10:28:42 -08:00
parent 33a5abd9a6
commit ca415c4d4c
1 changed files with 19 additions and 1 deletions
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20
drivers/gpu/drm/xe/xe_guc_submit.c
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@ -990,6 +990,24 @@ static u32 wq_space_until_wrap(struct xe_exec_queue *q)
return (WQ_SIZE - q->guc->wqi_tail);
}
static inline void relaxed_ms_sleep(unsigned int delay_ms)
{
unsigned long min_us, max_us;
if (!delay_ms)
return;
if (delay_ms > 20) {
msleep(delay_ms);
return;
}
min_us = mul_u32_u32(delay_ms, 1000);
max_us = min_us + 500;
usleep_range(min_us, max_us);
}
static int wq_wait_for_space(struct xe_exec_queue *q, u32 wqi_size)
{
struct xe_guc *guc = exec_queue_to_guc(q);
@ -1903,7 +1921,7 @@ static void __guc_exec_queue_process_msg_suspend(struct xe_sched_msg *msg)
since_resume_ms;
if (wait_ms > 0 && q->guc->resume_time)
msleep(wait_ms);
relaxed_ms_sleep(wait_ms);
set_exec_queue_suspended(q);
disable_scheduling(q, false);