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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2009-09-22 17:24:13 +0400 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2009-09-23 04:10:38 +0400 |
| commit | bb6baf76f45708dbba651ed76a7ad94462f30c0b (patch) | |
| tree | a58c54d10d9f35f32799d59189467607a84c1b4c | |
| parent | 9731129c5e3077d0c2da13479f91c3a07e341f70 (diff) | |
| download | linux-bb6baf76f45708dbba651ed76a7ad94462f30c0b.tar.xz | |
drm/i915: Track purged state.
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>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 24 | ||||
| -rw-r--r-- | include/drm/i915_drm.h | 1 |
2 files changed, 16 insertions, 9 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 8beec97fa348..f4f714e39b7b 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -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 inode *inode; + 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); + 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; } - obj_priv->madv = args->madv; - args->retained = obj_priv->gtt_space != NULL; + if (obj_priv->madv != __I915_MADV_PURGED) + obj_priv->madv = args->madv; /* 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); diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h index 607c9da061e8..7e0cb1da92e6 100644 --- a/include/drm/i915_drm.h +++ b/include/drm/i915_drm.h @@ -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 */ |