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drm/i915: Track purged state.

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In order to correctly prevent the invalid reuse of a purged buffer, we
need to track such events and warn the user before something bad
happens.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2009-09-22 14:24:13 +01:00
parent 9731129c5e
commit bb6baf76f4
2 changed files with 16 additions and 9 deletions
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14
drivers/gpu/drm/i915/i915_gem.c
View File

@ -1470,6 +1470,7 @@ i915_gem_object_put_pages(struct drm_gem_object *obj)
int i;
BUG_ON(obj_priv->pages_refcount == 0);
BUG_ON(obj_priv->madv == __I915_MADV_PURGED);
if (--obj_priv->pages_refcount != 0)
return;
@ -1534,11 +1535,14 @@ i915_gem_object_move_to_flushing(struct drm_gem_object *obj)
static void
i915_gem_object_truncate(struct drm_gem_object *obj)
{
struct drm_i915_gem_object *obj_priv = obj->driver_private;
struct inode *inode;
inode = obj->filp->f_path.dentry->d_inode;
if (inode->i_op->truncate)
inode->i_op->truncate (inode);
obj_priv->madv = __I915_MADV_PURGED;
}
static inline int
@ -2559,7 +2563,7 @@ i915_gem_object_bind_to_gtt(struct drm_gem_object *obj, unsigned alignment)
if (dev_priv->mm.suspended)
return -EBUSY;
if (obj_priv->madv == I915_MADV_DONTNEED) {
if (obj_priv->madv != I915_MADV_WILLNEED) {
DRM_ERROR("Attempting to bind a purgeable object\n");
return -EINVAL;
}
@ -3928,8 +3932,8 @@ i915_gem_pin_ioctl(struct drm_device *dev, void *data,
}
obj_priv = obj->driver_private;
if (obj_priv->madv == I915_MADV_DONTNEED) {
DRM_ERROR("Attempting to pin a I915_MADV_DONTNEED buffer\n");
if (obj_priv->madv != I915_MADV_WILLNEED) {
DRM_ERROR("Attempting to pin a purgeable buffer\n");
drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
@ -4081,14 +4085,16 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
return -EINVAL;
}
if (obj_priv->madv != __I915_MADV_PURGED)
obj_priv->madv = args->madv;
args->retained = obj_priv->gtt_space != NULL;
/* if the object is no longer bound, discard its backing storage */
if (i915_gem_object_is_purgeable(obj_priv) &&
obj_priv->gtt_space == NULL)
i915_gem_object_truncate(obj);
args->retained = obj_priv->madv != __I915_MADV_PURGED;
drm_gem_object_unreference(obj);
mutex_unlock(&dev->struct_mutex);

1
include/drm/i915_drm.h
View File

@ -671,6 +671,7 @@ struct drm_i915_get_pipe_from_crtc_id {
#define I915_MADV_WILLNEED 0
#define I915_MADV_DONTNEED 1
#define __I915_MADV_PURGED 2 /* internal state */
struct drm_i915_gem_madvise {
/** Handle of the buffer to change the backing store advice */