128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2019 Arm Ltd.
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*
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* Based on msm_gem_freedreno.c:
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* Copyright (C) 2016 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*/
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#include <linux/list.h>
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#include <drm/drm_device.h>
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#include <drm/drm_gem_shmem_helper.h>
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#include "panfrost_device.h"
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#include "panfrost_gem.h"
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#include "panfrost_mmu.h"
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static unsigned long
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panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
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{
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struct panfrost_device *pfdev = shrinker->private_data;
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struct drm_gem_shmem_object *shmem;
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unsigned long count = 0;
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if (!mutex_trylock(&pfdev->shrinker_lock))
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return 0;
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list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) {
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if (drm_gem_shmem_is_purgeable(shmem))
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count += shmem->base.size >> PAGE_SHIFT;
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}
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mutex_unlock(&pfdev->shrinker_lock);
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return count;
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}
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static bool panfrost_gem_purge(struct drm_gem_object *obj)
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{
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struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
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struct panfrost_gem_object *bo = to_panfrost_bo(obj);
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bool ret = false;
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if (atomic_read(&bo->gpu_usecount))
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return false;
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if (!mutex_trylock(&bo->mappings.lock))
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return false;
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if (!dma_resv_trylock(shmem->base.resv))
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goto unlock_mappings;
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panfrost_gem_teardown_mappings_locked(bo);
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drm_gem_shmem_purge(&bo->base);
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ret = true;
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dma_resv_unlock(shmem->base.resv);
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unlock_mappings:
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mutex_unlock(&bo->mappings.lock);
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return ret;
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}
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static unsigned long
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panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
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{
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struct panfrost_device *pfdev = shrinker->private_data;
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struct drm_gem_shmem_object *shmem, *tmp;
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unsigned long freed = 0;
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if (!mutex_trylock(&pfdev->shrinker_lock))
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return SHRINK_STOP;
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list_for_each_entry_safe(shmem, tmp, &pfdev->shrinker_list, madv_list) {
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if (freed >= sc->nr_to_scan)
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break;
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if (drm_gem_shmem_is_purgeable(shmem) &&
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panfrost_gem_purge(&shmem->base)) {
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freed += shmem->base.size >> PAGE_SHIFT;
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list_del_init(&shmem->madv_list);
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}
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}
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mutex_unlock(&pfdev->shrinker_lock);
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if (freed > 0)
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pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT);
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return freed;
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}
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/**
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* panfrost_gem_shrinker_init - Initialize panfrost shrinker
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* @dev: DRM device
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*
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* This function registers and sets up the panfrost shrinker.
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*/
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int panfrost_gem_shrinker_init(struct drm_device *dev)
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{
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struct panfrost_device *pfdev = dev->dev_private;
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pfdev->shrinker = shrinker_alloc(0, "drm-panfrost");
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if (!pfdev->shrinker)
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return -ENOMEM;
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pfdev->shrinker->count_objects = panfrost_gem_shrinker_count;
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pfdev->shrinker->scan_objects = panfrost_gem_shrinker_scan;
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pfdev->shrinker->private_data = pfdev;
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shrinker_register(pfdev->shrinker);
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return 0;
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}
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/**
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* panfrost_gem_shrinker_cleanup - Clean up panfrost shrinker
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* @dev: DRM device
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*
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* This function unregisters the panfrost shrinker.
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*/
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void panfrost_gem_shrinker_cleanup(struct drm_device *dev)
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{
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struct panfrost_device *pfdev = dev->dev_private;
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if (pfdev->shrinker)
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shrinker_free(pfdev->shrinker);
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}
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