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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Red Hat
* Author: Rob Clark <robdclark@gmail.com>
*/
#include <linux/vmalloc.h>
#include <linux/sched/mm.h>
#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_gpu.h"
#include "msm_gpu_trace.h"
/* Default disabled for now until it has some more testing on the different
* iommu combinations that can be paired with the driver:
*/
static bool enable_eviction = true;
MODULE_PARM_DESC(enable_eviction, "Enable swappable GEM buffers");
module_param(enable_eviction, bool, 0600);
static bool can_swap(void)
{
return enable_eviction && get_nr_swap_pages() > 0;
}
static bool can_block(struct shrink_control *sc)
{
if (!(sc->gfp_mask & __GFP_DIRECT_RECLAIM))
return false;
return current_is_kswapd() || (sc->gfp_mask & __GFP_RECLAIM);
}
static unsigned long
msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
{
struct msm_drm_private *priv =
container_of(shrinker, struct msm_drm_private, shrinker);
unsigned count = priv->lru.dontneed.count;
if (can_swap())
count += priv->lru.willneed.count;
return count;
}
static bool
purge(struct drm_gem_object *obj)
{
if (!is_purgeable(to_msm_bo(obj)))
return false;
if (msm_gem_active(obj))
return false;
msm_gem_purge(obj);
return true;
}
static bool
evict(struct drm_gem_object *obj)
{
if (is_unevictable(to_msm_bo(obj)))
return false;
if (msm_gem_active(obj))
return false;
msm_gem_evict(obj);
return true;
}
static bool
wait_for_idle(struct drm_gem_object *obj)
{
enum dma_resv_usage usage = dma_resv_usage_rw(true);
return dma_resv_wait_timeout(obj->resv, usage, false, 1000) > 0;
}
static bool
active_purge(struct drm_gem_object *obj)
{
if (!wait_for_idle(obj))
return false;
return purge(obj);
}
static bool
active_evict(struct drm_gem_object *obj)
{
if (!wait_for_idle(obj))
return false;
return evict(obj);
}
static unsigned long
msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
{
struct msm_drm_private *priv =
container_of(shrinker, struct msm_drm_private, shrinker);
struct {
struct drm_gem_lru *lru;
bool (*shrink)(struct drm_gem_object *obj);
bool cond;
unsigned long freed;
} stages[] = {
/* Stages of progressively more aggressive/expensive reclaim: */
{ &priv->lru.dontneed, purge, true },
{ &priv->lru.willneed, evict, can_swap() },
{ &priv->lru.dontneed, active_purge, can_block(sc) },
{ &priv->lru.willneed, active_evict, can_swap() && can_block(sc) },
};
long nr = sc->nr_to_scan;
unsigned long freed = 0;
for (unsigned i = 0; (nr > 0) && (i < ARRAY_SIZE(stages)); i++) {
if (!stages[i].cond)
continue;
stages[i].freed =
drm_gem_lru_scan(stages[i].lru, nr, stages[i].shrink);
nr -= stages[i].freed;
freed += stages[i].freed;
}
if (freed) {
trace_msm_gem_shrink(sc->nr_to_scan, stages[0].freed,
stages[1].freed, stages[2].freed,
stages[3].freed);
}
return (freed > 0) ? freed : SHRINK_STOP;
}
#ifdef CONFIG_DEBUG_FS
unsigned long
msm_gem_shrinker_shrink(struct drm_device *dev, unsigned long nr_to_scan)
{
struct msm_drm_private *priv = dev->dev_private;
struct shrink_control sc = {
.nr_to_scan = nr_to_scan,
};
int ret;
fs_reclaim_acquire(GFP_KERNEL);
ret = msm_gem_shrinker_scan(&priv->shrinker, &sc);
fs_reclaim_release(GFP_KERNEL);
return ret;
}
#endif
/* since we don't know any better, lets bail after a few
* and if necessary the shrinker will be invoked again.
* Seems better than unmapping *everything*
*/
static const int vmap_shrink_limit = 15;
static bool
vmap_shrink(struct drm_gem_object *obj)
{
if (!is_vunmapable(to_msm_bo(obj)))
return false;
msm_gem_vunmap(obj);
return true;
}
static int
msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
{
struct msm_drm_private *priv =
container_of(nb, struct msm_drm_private, vmap_notifier);
struct drm_gem_lru *lrus[] = {
&priv->lru.dontneed,
&priv->lru.willneed,
&priv->lru.pinned,
NULL,
};
unsigned idx, unmapped = 0;
for (idx = 0; lrus[idx] && unmapped < vmap_shrink_limit; idx++) {
unmapped += drm_gem_lru_scan(lrus[idx],
vmap_shrink_limit - unmapped,
vmap_shrink);
}
*(unsigned long *)ptr += unmapped;
if (unmapped > 0)
trace_msm_gem_purge_vmaps(unmapped);
return NOTIFY_DONE;
}
/**
* msm_gem_shrinker_init - Initialize msm shrinker
* @dev: drm device
*
* This function registers and sets up the msm shrinker.
*/
void msm_gem_shrinker_init(struct drm_device *dev)
{
struct msm_drm_private *priv = dev->dev_private;
priv->shrinker.count_objects = msm_gem_shrinker_count;
priv->shrinker.scan_objects = msm_gem_shrinker_scan;
priv->shrinker.seeks = DEFAULT_SEEKS;
WARN_ON(register_shrinker(&priv->shrinker, "drm-msm_gem"));
priv->vmap_notifier.notifier_call = msm_gem_shrinker_vmap;
WARN_ON(register_vmap_purge_notifier(&priv->vmap_notifier));
}
/**
* msm_gem_shrinker_cleanup - Clean up msm shrinker
* @dev: drm device
*
* This function unregisters the msm shrinker.
*/
void msm_gem_shrinker_cleanup(struct drm_device *dev)
{
struct msm_drm_private *priv = dev->dev_private;
if (priv->shrinker.nr_deferred) {
WARN_ON(unregister_vmap_purge_notifier(&priv->vmap_notifier));
unregister_shrinker(&priv->shrinker);
}
}
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