123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
// 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>
|
|
*/
|
|
|
|
#include <linux/list.h>
|
|
|
|
#include <drm/drm_device.h>
|
|
#include <drm/drm_gem_shmem_helper.h>
|
|
|
|
#include "panfrost_device.h"
|
|
#include "panfrost_gem.h"
|
|
#include "panfrost_mmu.h"
|
|
|
|
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;
|
|
|
|
if (!mutex_trylock(&pfdev->shrinker_lock))
|
|
return 0;
|
|
|
|
list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) {
|
|
if (drm_gem_shmem_is_purgeable(shmem))
|
|
count += shmem->base.size >> PAGE_SHIFT;
|
|
}
|
|
|
|
mutex_unlock(&pfdev->shrinker_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static bool panfrost_gem_purge(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
|
struct panfrost_gem_object *bo = to_panfrost_bo(obj);
|
|
bool ret = false;
|
|
|
|
if (atomic_read(&bo->gpu_usecount))
|
|
return false;
|
|
|
|
if (!mutex_trylock(&bo->mappings.lock))
|
|
return false;
|
|
|
|
if (!mutex_trylock(&shmem->pages_lock))
|
|
goto unlock_mappings;
|
|
|
|
panfrost_gem_teardown_mappings_locked(bo);
|
|
drm_gem_shmem_purge_locked(&bo->base);
|
|
ret = true;
|
|
|
|
mutex_unlock(&shmem->pages_lock);
|
|
|
|
unlock_mappings:
|
|
mutex_unlock(&bo->mappings.lock);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!mutex_trylock(&pfdev->shrinker_lock))
|
|
return SHRINK_STOP;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&pfdev->shrinker_lock);
|
|
|
|
if (freed > 0)
|
|
pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT);
|
|
|
|
return freed;
|
|
}
|
|
|
|
/**
|
|
* 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));
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (pfdev->shrinker.nr_deferred) {
|
|
unregister_shrinker(&pfdev->shrinker);
|
|
}
|
|
}
|