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SubjectRe: [Linaro-mm-sig] [PATCH] drm/scheduler: Unwrap job dependencies
From
Am 05.12.23 um 20:02 schrieb Rob Clark:
> From: Rob Clark <robdclark@chromium.org>
>
> Container fences have burner contexts, which makes the trick to store at
> most one fence per context somewhat useless if we don't unwrap array or
> chain fences.
>
> Signed-off-by: Rob Clark <robdclark@chromium.org>

Reviewed-by: Christian König <christian.koenig@amd.com>

> ---
> drivers/gpu/drm/scheduler/sched_main.c | 47 ++++++++++++++++++--------
> 1 file changed, 32 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
> index 9762464e3f99..16b550949c57 100644
> --- a/drivers/gpu/drm/scheduler/sched_main.c
> +++ b/drivers/gpu/drm/scheduler/sched_main.c
> @@ -52,6 +52,7 @@
> #include <linux/wait.h>
> #include <linux/sched.h>
> #include <linux/completion.h>
> +#include <linux/dma-fence-unwrap.h>
> #include <linux/dma-resv.h>
> #include <uapi/linux/sched/types.h>
>
> @@ -684,27 +685,14 @@ void drm_sched_job_arm(struct drm_sched_job *job)
> }
> EXPORT_SYMBOL(drm_sched_job_arm);
>
> -/**
> - * drm_sched_job_add_dependency - adds the fence as a job dependency
> - * @job: scheduler job to add the dependencies to
> - * @fence: the dma_fence to add to the list of dependencies.
> - *
> - * Note that @fence is consumed in both the success and error cases.
> - *
> - * Returns:
> - * 0 on success, or an error on failing to expand the array.
> - */
> -int drm_sched_job_add_dependency(struct drm_sched_job *job,
> - struct dma_fence *fence)
> +static int drm_sched_job_add_single_dependency(struct drm_sched_job *job,
> + struct dma_fence *fence)
> {
> struct dma_fence *entry;
> unsigned long index;
> u32 id = 0;
> int ret;
>
> - if (!fence)
> - return 0;
> -
> /* Deduplicate if we already depend on a fence from the same context.
> * This lets the size of the array of deps scale with the number of
> * engines involved, rather than the number of BOs.
> @@ -728,6 +716,35 @@ int drm_sched_job_add_dependency(struct drm_sched_job *job,
>
> return ret;
> }
> +
> +/**
> + * drm_sched_job_add_dependency - adds the fence as a job dependency
> + * @job: scheduler job to add the dependencies to
> + * @fence: the dma_fence to add to the list of dependencies.
> + *
> + * Note that @fence is consumed in both the success and error cases.
> + *
> + * Returns:
> + * 0 on success, or an error on failing to expand the array.
> + */
> +int drm_sched_job_add_dependency(struct drm_sched_job *job,
> + struct dma_fence *fence)
> +{
> + struct dma_fence_unwrap iter;
> + struct dma_fence *f;
> + int ret = 0;
> +
> + dma_fence_unwrap_for_each (f, &iter, fence) {
> + dma_fence_get(f);
> + ret = drm_sched_job_add_single_dependency(job, f);
> + if (ret)
> + break;
> + }
> +
> + dma_fence_put(fence);
> +
> + return ret;
> +}
> EXPORT_SYMBOL(drm_sched_job_add_dependency);
>
> /**

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