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drm/panfrost: Add madvise and shrinker support
Add support for madvise and a shrinker similar to other drivers. This allows userspace to mark BOs which can be freed when there is memory pressure. Unlike other implementations, we don't depend on struct_mutex. The driver maintains a list of BOs which can be freed when the shrinker is called. Access to the list is serialized with the shrinker_lock. Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com> Cc: David Airlie <airlied@linux.ie> Cc: Daniel Vetter <daniel@ffwll.ch> Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20190805143358.21245-2-robh@kernel.org
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/* SPDX-License-Identifier: GPL-2.0 */ | ||
/* Copyright (C) 2019 Arm Ltd. | ||
* | ||
* Based on msm_gem_freedreno.c: | ||
* Copyright (C) 2016 Red Hat | ||
* Author: Rob Clark <robdclark@gmail.com> | ||
*/ | ||
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#include <linux/list.h> | ||
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#include <drm/drm_device.h> | ||
#include <drm/drm_gem_shmem_helper.h> | ||
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#include "panfrost_device.h" | ||
#include "panfrost_gem.h" | ||
#include "panfrost_mmu.h" | ||
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static unsigned long | ||
panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc) | ||
{ | ||
struct panfrost_device *pfdev = | ||
container_of(shrinker, struct panfrost_device, shrinker); | ||
struct drm_gem_shmem_object *shmem; | ||
unsigned long count = 0; | ||
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if (!mutex_trylock(&pfdev->shrinker_lock)) | ||
return 0; | ||
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list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) { | ||
if (drm_gem_shmem_is_purgeable(shmem)) | ||
count += shmem->base.size >> PAGE_SHIFT; | ||
} | ||
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mutex_unlock(&pfdev->shrinker_lock); | ||
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return count; | ||
} | ||
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static void panfrost_gem_purge(struct drm_gem_object *obj) | ||
{ | ||
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); | ||
mutex_lock(&shmem->pages_lock); | ||
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panfrost_mmu_unmap(to_panfrost_bo(obj)); | ||
drm_gem_shmem_purge_locked(obj); | ||
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mutex_unlock(&shmem->pages_lock); | ||
} | ||
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static unsigned long | ||
panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc) | ||
{ | ||
struct panfrost_device *pfdev = | ||
container_of(shrinker, struct panfrost_device, shrinker); | ||
struct drm_gem_shmem_object *shmem, *tmp; | ||
unsigned long freed = 0; | ||
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if (!mutex_trylock(&pfdev->shrinker_lock)) | ||
return SHRINK_STOP; | ||
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list_for_each_entry_safe(shmem, tmp, &pfdev->shrinker_list, madv_list) { | ||
if (freed >= sc->nr_to_scan) | ||
break; | ||
if (drm_gem_shmem_is_purgeable(shmem)) { | ||
panfrost_gem_purge(&shmem->base); | ||
freed += shmem->base.size >> PAGE_SHIFT; | ||
list_del_init(&shmem->madv_list); | ||
} | ||
} | ||
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mutex_unlock(&pfdev->shrinker_lock); | ||
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if (freed > 0) | ||
pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT); | ||
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return freed; | ||
} | ||
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/** | ||
* panfrost_gem_shrinker_init - Initialize panfrost shrinker | ||
* @dev: DRM device | ||
* | ||
* This function registers and sets up the panfrost shrinker. | ||
*/ | ||
void panfrost_gem_shrinker_init(struct drm_device *dev) | ||
{ | ||
struct panfrost_device *pfdev = dev->dev_private; | ||
pfdev->shrinker.count_objects = panfrost_gem_shrinker_count; | ||
pfdev->shrinker.scan_objects = panfrost_gem_shrinker_scan; | ||
pfdev->shrinker.seeks = DEFAULT_SEEKS; | ||
WARN_ON(register_shrinker(&pfdev->shrinker)); | ||
} | ||
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/** | ||
* panfrost_gem_shrinker_cleanup - Clean up panfrost shrinker | ||
* @dev: DRM device | ||
* | ||
* This function unregisters the panfrost shrinker. | ||
*/ | ||
void panfrost_gem_shrinker_cleanup(struct drm_device *dev) | ||
{ | ||
struct panfrost_device *pfdev = dev->dev_private; | ||
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if (pfdev->shrinker.nr_deferred) { | ||
unregister_shrinker(&pfdev->shrinker); | ||
} | ||
} |
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