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drm/v3d: clean caches at the end of render jobs on request from user space

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Extends the user space ioctl for CL submissions so it can include a request
to flush the cache once the CL execution has completed. Fixes memory
write violation messages reported by the kernel in workloads involving
shader memory writes (SSBOs, shader images, scratch, etc) which sometimes
also lead to GPU resets during Piglit and CTS workloads.

v2: if v3d_job_init() fails we need to kfree() the job instead of
    v3d_job_put() it (Eric Anholt).

v3 (Eric Anholt):
  - Drop _FLAG suffix from the new flag name.
  - Add a new param so userspace can tell whether cache flushing is
    implemented in the kernel.

Signed-off-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190919071016.4578-1-itoral@igalia.com
This commit is contained in:
Iago Toral Quiroga
2019-09-19 09:10:16 +02:00
committed by Eric Anholt
parent 978f6b0693
commit 455d56ce80
3 changed files with 54 additions and 11 deletions
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54
drivers/gpu/drm/v3d/v3d_gem.c
View File

@@ -530,13 +530,16 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
struct drm_v3d_submit_cl *args = data;
struct v3d_bin_job *bin = NULL;
struct v3d_render_job *render;
struct v3d_job *clean_job = NULL;
struct v3d_job *last_job;
struct ww_acquire_ctx acquire_ctx;
int ret = 0;
trace_v3d_submit_cl_ioctl(&v3d->drm, args->rcl_start, args->rcl_end);
if (args->pad != 0) {
DRM_INFO("pad must be zero: %d\n", args->pad);
if (args->flags != 0 &&
args->flags != DRM_V3D_SUBMIT_CL_FLUSH_CACHE) {
DRM_INFO("invalid flags: %d\n", args->flags);
return -EINVAL;
}
@@ -576,12 +579,31 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
bin->render = render;
}
ret = v3d_lookup_bos(dev, file_priv, &render->base,
if (args->flags & DRM_V3D_SUBMIT_CL_FLUSH_CACHE) {
clean_job = kcalloc(1, sizeof(*clean_job), GFP_KERNEL);
if (!clean_job) {
ret = -ENOMEM;
goto fail;
}
ret = v3d_job_init(v3d, file_priv, clean_job, v3d_job_free, 0);
if (ret) {
kfree(clean_job);
clean_job = NULL;
goto fail;
}
last_job = clean_job;
} else {
last_job = &render->base;
}
ret = v3d_lookup_bos(dev, file_priv, last_job,
args->bo_handles, args->bo_handle_count);
if (ret)
goto fail;
ret = v3d_lock_bo_reservations(&render->base, &acquire_ctx);
ret = v3d_lock_bo_reservations(last_job, &acquire_ctx);
if (ret)
goto fail;
@@ -600,28 +622,44 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
ret = v3d_push_job(v3d_priv, &render->base, V3D_RENDER);
if (ret)
goto fail_unreserve;
if (clean_job) {
struct dma_fence *render_fence =
dma_fence_get(render->base.done_fence);
ret = drm_gem_fence_array_add(&clean_job->deps, render_fence);
if (ret)
goto fail_unreserve;
ret = v3d_push_job(v3d_priv, clean_job, V3D_CACHE_CLEAN);
if (ret)
goto fail_unreserve;
}
mutex_unlock(&v3d->sched_lock);
v3d_attach_fences_and_unlock_reservation(file_priv,
&render->base,
last_job,
&acquire_ctx,
args->out_sync,
render->base.done_fence);
last_job->done_fence);
if (bin)
v3d_job_put(&bin->base);
v3d_job_put(&render->base);
if (clean_job)
v3d_job_put(clean_job);
return 0;
fail_unreserve:
mutex_unlock(&v3d->sched_lock);
drm_gem_unlock_reservations(render->base.bo,
render->base.bo_count, &acquire_ctx);
drm_gem_unlock_reservations(last_job->bo,
last_job->bo_count, &acquire_ctx);
fail:
if (bin)
v3d_job_put(&bin->base);
v3d_job_put(&render->base);
if (clean_job)
v3d_job_put(clean_job);
return ret;
}