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drm/vc4: Use DMA Resv to implement VC4 wait BO IOCTL

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Since the BOs used by VC4 have DMA Reservation Objects attached to
them, waiting for seqnos to check BO availability is unnecessary.
Instead, `drm_gem_dma_resv_wait()` can be used.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241220134204.634577-3-mcanal@igalia.com
This commit is contained in:
Maíra Canal
2024-12-20 10:37:08 -03:00
parent 04630796c4
commit 21bd85f82e
1 changed files with 14 additions and 11 deletions
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25
drivers/gpu/drm/vc4/vc4_gem.c
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@@ -1020,8 +1020,10 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
struct vc4_dev *vc4 = to_vc4_dev(dev);
int ret;
struct drm_vc4_wait_bo *args = data;
struct drm_gem_object *gem_obj;
struct vc4_bo *bo;
unsigned long timeout_jiffies =
usecs_to_jiffies(div_u64(args->timeout_ns, 1000));
ktime_t start = ktime_get();
u64 delta_ns;
if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
return -ENODEV;
@@ -1029,17 +1031,18 @@ vc4_wait_bo_ioctl(struct drm_device *dev, void *data,
if (args->pad != 0)
return -EINVAL;
gem_obj = drm_gem_object_lookup(file_priv, args->handle);
if (!gem_obj) {
DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
bo = to_vc4_bo(gem_obj);
ret = drm_gem_dma_resv_wait(file_priv, args->handle,
true, timeout_jiffies);
ret = vc4_wait_for_seqno_ioctl_helper(dev, bo->seqno,
&args->timeout_ns);
/* Decrement the user's timeout, in case we got interrupted
* such that the ioctl will be restarted.
*/
delta_ns = ktime_to_ns(ktime_sub(ktime_get(), start));
if (delta_ns < args->timeout_ns)
args->timeout_ns -= delta_ns;
else
args->timeout_ns = 0;
drm_gem_object_put(gem_obj);
return ret;
}