* [PATCH v2] drm/msm: Avoid rounding up to one jiffy
@ 2025-01-13 15:48 Rob Clark
2025-01-15 19:14 ` Akhil P Oommen
0 siblings, 1 reply; 2+ messages in thread
From: Rob Clark @ 2025-01-13 15:48 UTC (permalink / raw)
To: dri-devel
Cc: freedreno, linux-arm-msm, Rob Clark, Rob Clark, Abhinav Kumar,
Dmitry Baryshkov, Sean Paul, Marijn Suijten, David Airlie,
Simona Vetter, open list
From: Rob Clark <robdclark@chromium.org>
If userspace is trying to achieve a timeout of zero, let 'em have it.
Only round up if the timeout is greater than zero.
Fixes: 4969bccd5f4e ("drm/msm: Avoid rounding down to zero jiffies")
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/msm/msm_drv.h | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index fee31680a6d5..a65077855201 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -537,15 +537,12 @@ static inline int align_pitch(int width, int bpp)
static inline unsigned long timeout_to_jiffies(const ktime_t *timeout)
{
ktime_t now = ktime_get();
- s64 remaining_jiffies;
- if (ktime_compare(*timeout, now) < 0) {
- remaining_jiffies = 0;
- } else {
- ktime_t rem = ktime_sub(*timeout, now);
- remaining_jiffies = ktime_divns(rem, NSEC_PER_SEC / HZ);
- }
+ if (ktime_compare(*timeout, now) <= 0)
+ return 0;
+ ktime_t rem = ktime_sub(*timeout, now);
+ s64 remaining_jiffies = ktime_divns(rem, NSEC_PER_SEC / HZ);
return clamp(remaining_jiffies, 1LL, (s64)INT_MAX);
}
--
2.47.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH v2] drm/msm: Avoid rounding up to one jiffy
2025-01-13 15:48 [PATCH v2] drm/msm: Avoid rounding up to one jiffy Rob Clark
@ 2025-01-15 19:14 ` Akhil P Oommen
0 siblings, 0 replies; 2+ messages in thread
From: Akhil P Oommen @ 2025-01-15 19:14 UTC (permalink / raw)
To: Rob Clark, dri-devel
Cc: freedreno, linux-arm-msm, Rob Clark, Abhinav Kumar,
Dmitry Baryshkov, Sean Paul, Marijn Suijten, David Airlie,
Simona Vetter, open list
On 1/13/2025 9:18 PM, Rob Clark wrote:
> From: Rob Clark <robdclark@chromium.org>
>
> If userspace is trying to achieve a timeout of zero, let 'em have it.
> Only round up if the timeout is greater than zero.
>
> Fixes: 4969bccd5f4e ("drm/msm: Avoid rounding down to zero jiffies")
> Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
-Akhil
> ---
> drivers/gpu/drm/msm/msm_drv.h | 11 ++++-------
> 1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index fee31680a6d5..a65077855201 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -537,15 +537,12 @@ static inline int align_pitch(int width, int bpp)
> static inline unsigned long timeout_to_jiffies(const ktime_t *timeout)
> {
> ktime_t now = ktime_get();
> - s64 remaining_jiffies;
>
> - if (ktime_compare(*timeout, now) < 0) {
> - remaining_jiffies = 0;
> - } else {
> - ktime_t rem = ktime_sub(*timeout, now);
> - remaining_jiffies = ktime_divns(rem, NSEC_PER_SEC / HZ);
> - }
> + if (ktime_compare(*timeout, now) <= 0)
> + return 0;
>
> + ktime_t rem = ktime_sub(*timeout, now);
> + s64 remaining_jiffies = ktime_divns(rem, NSEC_PER_SEC / HZ);
> return clamp(remaining_jiffies, 1LL, (s64)INT_MAX);
> }
>
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