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drm/nouveau: add spinlock around ramht modifications

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Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2010-09-01 15:24:36 +10:00
parent e05c5a317e
commit dac7900804
2 changed files with 58 additions and 21 deletions
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76
drivers/gpu/drm/nouveau/nouveau_ramht.c
View File

@ -27,13 +27,13 @@
#include "nouveau_drv.h"
#include "nouveau_ramht.h"
static uint32_t
nouveau_ramht_hash_handle(struct nouveau_channel *chan, uint32_t handle)
static u32
nouveau_ramht_hash_handle(struct nouveau_channel *chan, u32 handle)
{
struct drm_device *dev = chan->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_ramht *ramht = chan->ramht;
uint32_t hash = 0;
u32 hash = 0;
int i;
NV_DEBUG(dev, "ch%d handle=0x%08x\n", chan->id, handle);
@ -53,10 +53,10 @@ nouveau_ramht_hash_handle(struct nouveau_channel *chan, uint32_t handle)
static int
nouveau_ramht_entry_valid(struct drm_device *dev, struct nouveau_gpuobj *ramht,
uint32_t offset)
u32 offset)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
uint32_t ctx = nv_ro32(ramht, offset + 4);
u32 ctx = nv_ro32(ramht, offset + 4);
if (dev_priv->card_type < NV_40)
return ((ctx & NV_RAMHT_CONTEXT_VALID) != 0);
@ -72,7 +72,8 @@ nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
struct nouveau_instmem_engine *instmem = &dev_priv->engine.instmem;
struct nouveau_ramht_entry *entry;
struct nouveau_gpuobj *ramht = chan->ramht->gpuobj;
uint32_t ctx, co, ho;
unsigned long flags;
u32 ctx, co, ho;
if (nouveau_ramht_find(chan, handle))
return -EEXIST;
@ -83,7 +84,6 @@ nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
entry->channel = chan;
entry->gpuobj = NULL;
entry->handle = handle;
list_add(&entry->head, &chan->ramht->entries);
nouveau_gpuobj_ref(gpuobj, &entry->gpuobj);
if (dev_priv->card_type < NV_40) {
@ -105,6 +105,9 @@ nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
}
}
spin_lock_irqsave(&chan->ramht->lock, flags);
list_add(&entry->head, &chan->ramht->entries);
co = ho = nouveau_ramht_hash_handle(chan, handle);
do {
if (!nouveau_ramht_entry_valid(dev, ramht, co)) {
@ -114,6 +117,7 @@ nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
nv_wo32(ramht, co + 0, handle);
nv_wo32(ramht, co + 4, ctx);
spin_unlock_irqrestore(&chan->ramht->lock, flags);
instmem->flush(dev);
return 0;
}
@ -127,12 +131,13 @@ nouveau_ramht_insert(struct nouveau_channel *chan, u32 handle,
NV_ERROR(dev, "RAMHT space exhausted. ch=%d\n", chan->id);
list_del(&entry->head);
spin_unlock_irqrestore(&chan->ramht->lock, flags);
kfree(entry);
return -ENOMEM;
}
void
nouveau_ramht_remove(struct nouveau_channel *chan, u32 handle)
static void
nouveau_ramht_remove_locked(struct nouveau_channel *chan, u32 handle)
{
struct drm_device *dev = chan->dev;
struct drm_nouveau_private *dev_priv = dev->dev_private;
@ -173,17 +178,35 @@ nouveau_ramht_remove(struct nouveau_channel *chan, u32 handle)
chan->id, handle);
}
void
nouveau_ramht_remove(struct nouveau_channel *chan, u32 handle)
{
struct nouveau_ramht *ramht = chan->ramht;
unsigned long flags;
spin_lock_irqsave(&ramht->lock, flags);
nouveau_ramht_remove_locked(chan, handle);
spin_unlock_irqrestore(&ramht->lock, flags);
}
struct nouveau_gpuobj *
nouveau_ramht_find(struct nouveau_channel *chan, u32 handle)
{
struct nouveau_ramht *ramht = chan->ramht;
struct nouveau_ramht_entry *entry;
struct nouveau_gpuobj *gpuobj = NULL;
unsigned long flags;
spin_lock_irqsave(&ramht->lock, flags);
list_for_each_entry(entry, &chan->ramht->entries, head) {
if (entry->channel == chan && entry->handle == handle)
return entry->gpuobj;
if (entry->channel == chan && entry->handle == handle) {
gpuobj = entry->gpuobj;
break;
}
}
spin_unlock_irqrestore(&ramht->lock, flags);
return NULL;
return gpuobj;
}
int
@ -197,36 +220,49 @@ nouveau_ramht_new(struct drm_device *dev, struct nouveau_gpuobj *gpuobj,
return -ENOMEM;
ramht->dev = dev;
ramht->refcount = 1;
kref_init(&ramht->refcount);
ramht->bits = drm_order(gpuobj->size / 8);
INIT_LIST_HEAD(&ramht->entries);
spin_lock_init(&ramht->lock);
nouveau_gpuobj_ref(gpuobj, &ramht->gpuobj);
*pramht = ramht;
return 0;
}
static void
nouveau_ramht_del(struct kref *ref)
{
struct nouveau_ramht *ramht =
container_of(ref, struct nouveau_ramht, refcount);
nouveau_gpuobj_ref(NULL, &ramht->gpuobj);
kfree(ramht);
}
void
nouveau_ramht_ref(struct nouveau_ramht *ref, struct nouveau_ramht **ptr,
struct nouveau_channel *chan)
{
struct nouveau_ramht_entry *entry, *tmp;
struct nouveau_ramht *ramht;
unsigned long flags;
if (ref)
ref->refcount++;
kref_get(&ref->refcount);
ramht = *ptr;
if (ramht) {
spin_lock_irqsave(&ramht->lock, flags);
list_for_each_entry_safe(entry, tmp, &ramht->entries, head) {
if (entry->channel == chan)
nouveau_ramht_remove(chan, entry->handle);
}
if (entry->channel != chan)
continue;
if (--ramht->refcount == 0) {
nouveau_gpuobj_ref(NULL, &ramht->gpuobj);
kfree(ramht);
nouveau_ramht_remove_locked(chan, entry->handle);
}
spin_unlock_irqrestore(&ramht->lock, flags);
kref_put(&ramht->refcount, nouveau_ramht_del);
}
*ptr = ref;
}

3
drivers/gpu/drm/nouveau/nouveau_ramht.h
View File

@ -34,7 +34,8 @@ struct nouveau_ramht_entry {
struct nouveau_ramht {
struct drm_device *dev;
int refcount;
struct kref refcount;
spinlock_t lock;
struct nouveau_gpuobj *gpuobj;
struct list_head entries;
int bits;