1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232
|
// 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 = false;
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);
}
}
|