Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> As we shrink an object, also see if we can prune the dma-resv of idle
> fences it is maintaining a reference to.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Makefile | 1 +
> drivers/gpu/drm/i915/dma_resv_utils.c | 17 +++++++++++++++++
> drivers/gpu/drm/i915/dma_resv_utils.h | 13 +++++++++++++
> drivers/gpu/drm/i915/gem/i915_gem_shrinker.c | 3 +++
> drivers/gpu/drm/i915/gem/i915_gem_wait.c | 8 +++-----
> 5 files changed, 37 insertions(+), 5 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/dma_resv_utils.c
> create mode 100644 drivers/gpu/drm/i915/dma_resv_utils.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 3a439b1d0496..f1c7c3246226 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -58,6 +58,7 @@ i915-y += i915_drv.o \
>
> # core library code
> i915-y += \
> + dma_resv_utils.o \
> i915_memcpy.o \
> i915_mm.o \
> i915_sw_fence.o \
> diff --git a/drivers/gpu/drm/i915/dma_resv_utils.c b/drivers/gpu/drm/i915/dma_resv_utils.c
> new file mode 100644
> index 000000000000..9e508e7d4629
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/dma_resv_utils.c
> @@ -0,0 +1,17 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
> + */
> +
> +#include <linux/dma-resv.h>
> +
> +#include "dma_resv_utils.h"
> +
> +void dma_resv_prune(struct dma_resv *resv)
> +{
> + if (dma_resv_trylock(resv)) {
> + if (dma_resv_test_signaled_rcu(resv, true))
> + dma_resv_add_excl_fence(resv, NULL);
> + dma_resv_unlock(resv);
> + }
> +}
> diff --git a/drivers/gpu/drm/i915/dma_resv_utils.h b/drivers/gpu/drm/i915/dma_resv_utils.h
> new file mode 100644
> index 000000000000..b9d8fb5f8367
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/dma_resv_utils.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2020 Intel Corporation
> + */
> +
> +#ifndef DMA_RESV_UTILS_H
> +#define DMA_RESV_UTILS_H
> +
> +struct dma_resv;
> +
> +void dma_resv_prune(struct dma_resv *resv);
> +
> +#endif /* DMA_RESV_UTILS_H */
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
> index dc8f052a0ffe..c2dba1cd9532 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_shrinker.c
> @@ -15,6 +15,7 @@
>
> #include "gt/intel_gt_requests.h"
>
> +#include "dma_resv_utils.h"
> #include "i915_trace.h"
>
> static bool swap_available(void)
> @@ -209,6 +210,8 @@ i915_gem_shrink(struct drm_i915_private *i915,
> mutex_unlock(&obj->mm.lock);
> }
>
> + dma_resv_prune(obj->base.resv);
> +
> scanned += obj->base.size >> PAGE_SHIFT;
> i915_gem_object_put(obj);
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_wait.c b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
> index 8af55cd3e690..c1b13ac50d0f 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_wait.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
> @@ -9,6 +9,7 @@
>
> #include "gt/intel_engine.h"
>
> +#include "dma_resv_utils.h"
> #include "i915_gem_ioctls.h"
> #include "i915_gem_object.h"
>
> @@ -84,11 +85,8 @@ i915_gem_object_wait_reservation(struct dma_resv *resv,
> * Opportunistically prune the fences iff we know they have *all* been
Learned that iff is a word, proper and accurate. So prolly not typo :)
Patch is,
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> * signaled.
> */
> - if (prune_fences && dma_resv_trylock(resv)) {
> - if (dma_resv_test_signaled_rcu(resv, true))
> - dma_resv_add_excl_fence(resv, NULL);
> - dma_resv_unlock(resv);
> - }
> + if (prune_fences)
> + dma_resv_prune(resv);
>
> return timeout;
> }
> --
> 2.20.1
>
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