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drm/i915: Add a spinlock to protect the active_list

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This is a baby-step in the direction of having finer-grained
locking than the struct_mutex. Specifically, this will enable
new debugging code to read the active list for printing out
GPU state when the GPU is wedged, (while the struct_mutex is
held, of course).

Signed-off-by: Carl Worth <cworth@cworth.org>
[anholt: indentation fix]
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Carl Worth 2009-03-20 11:54:25 -07:00 committed by Eric Anholt
parent 7026d4ac1f
commit 5e118f4139
4 changed files with 29 additions and 4 deletions
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1
drivers/gpu/drm/i915/i915_drv.h
View file

@ -300,6 +300,7 @@ typedef struct drm_i915_private {
*
* A reference is held on the buffer while on this list.
*/
spinlock_t active_list_lock;
struct list_head active_list;
/**

24
drivers/gpu/drm/i915/i915_gem.c
View file

@ -1325,8 +1325,10 @@ i915_gem_object_move_to_active(struct drm_gem_object *obj, uint32_t seqno)
obj_priv->active = 1;
}
/* Move from whatever list we were on to the tail of execution. */
spin_lock(&dev_priv->mm.active_list_lock);
list_move_tail(&obj_priv->list,
&dev_priv->mm.active_list);
spin_unlock(&dev_priv->mm.active_list_lock);
obj_priv->last_rendering_seqno = seqno;
}
@ -1468,6 +1470,7 @@ i915_gem_retire_request(struct drm_device *dev,
/* Move any buffers on the active list that are no longer referenced
* by the ringbuffer to the flushing/inactive lists as appropriate.
*/
spin_lock(&dev_priv->mm.active_list_lock);
while (!list_empty(&dev_priv->mm.active_list)) {
struct drm_gem_object *obj;
struct drm_i915_gem_object *obj_priv;
@ -1482,7 +1485,7 @@ i915_gem_retire_request(struct drm_device *dev,
* this seqno.
*/
if (obj_priv->last_rendering_seqno != request->seqno)
return;
goto out;
#if WATCH_LRU
DRM_INFO("%s: retire %d moves to inactive list %p\n",
@ -1494,6 +1497,8 @@ i915_gem_retire_request(struct drm_device *dev,
else
i915_gem_object_move_to_inactive(obj);
}
out:
spin_unlock(&dev_priv->mm.active_list_lock);
}
/**
@ -2215,15 +2220,20 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
}
}
if (obj_priv->gtt_space == NULL) {
bool lists_empty;
/* If the gtt is empty and we're still having trouble
* fitting our object in, we're out of memory.
*/
#if WATCH_LRU
DRM_INFO("%s: GTT full, evicting something\n", __func__);
#endif
if (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list)) {
spin_lock(&dev_priv->mm.active_list_lock);
lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
list_empty(&dev_priv->mm.active_list));
spin_unlock(&dev_priv->mm.active_list_lock);
if (lists_empty) {
DRM_ERROR("GTT full, but LRU list empty\n");
return -ENOMEM;
}
@ -3679,6 +3689,7 @@ i915_gem_idle(struct drm_device *dev)
i915_gem_retire_requests(dev);
spin_lock(&dev_priv->mm.active_list_lock);
if (!dev_priv->mm.wedged) {
/* Active and flushing should now be empty as we've
* waited for a sequence higher than any pending execbuffer
@ -3705,6 +3716,7 @@ i915_gem_idle(struct drm_device *dev)
obj_priv->obj->write_domain &= ~I915_GEM_GPU_DOMAINS;
i915_gem_object_move_to_inactive(obj_priv->obj);
}
spin_unlock(&dev_priv->mm.active_list_lock);
while (!list_empty(&dev_priv->mm.flushing_list)) {
struct drm_i915_gem_object *obj_priv;
@ -3953,7 +3965,10 @@ i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
if (ret != 0)
return ret;
spin_lock(&dev_priv->mm.active_list_lock);
BUG_ON(!list_empty(&dev_priv->mm.active_list));
spin_unlock(&dev_priv->mm.active_list_lock);
BUG_ON(!list_empty(&dev_priv->mm.flushing_list));
BUG_ON(!list_empty(&dev_priv->mm.inactive_list));
BUG_ON(!list_empty(&dev_priv->mm.request_list));
@ -3997,6 +4012,7 @@ i915_gem_load(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
spin_lock_init(&dev_priv->mm.active_list_lock);
INIT_LIST_HEAD(&dev_priv->mm.active_list);
INIT_LIST_HEAD(&dev_priv->mm.flushing_list);
INIT_LIST_HEAD(&dev_priv->mm.inactive_list);

2
drivers/gpu/drm/i915/i915_gem_debug.c
View file

@ -105,12 +105,14 @@ i915_dump_lru(struct drm_device *dev, const char *where)
struct drm_i915_gem_object *obj_priv;
DRM_INFO("active list %s {\n", where);
spin_lock(&dev_priv->mm.active_list_lock);
list_for_each_entry(obj_priv, &dev_priv->mm.active_list,
list)
{
DRM_INFO(" %p: %08x\n", obj_priv,
obj_priv->last_rendering_seqno);
}
spin_unlock(&dev_priv->mm.active_list_lock);
DRM_INFO("}\n");
DRM_INFO("flushing list %s {\n", where);
list_for_each_entry(obj_priv, &dev_priv->mm.flushing_list,

6
drivers/gpu/drm/i915/i915_gem_debugfs.c
View file

@ -69,10 +69,13 @@ static int i915_gem_object_list_info(struct seq_file *m, void *data)
struct drm_device *dev = node->minor->dev;
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj_priv;
spinlock_t *lock = NULL;
switch (list) {
case ACTIVE_LIST:
seq_printf(m, "Active:\n");
lock = &dev_priv->mm.active_list_lock;
spin_lock(lock);
head = &dev_priv->mm.active_list;
break;
case INACTIVE_LIST:
@ -104,6 +107,9 @@ static int i915_gem_object_list_info(struct seq_file *m, void *data)
seq_printf(m, " (fence: %d\n", obj_priv->fence_reg);
seq_printf(m, "\n");
}
if (lock)
spin_unlock(lock);
return 0;
}