Commit 29a9a6a3 authored by Chris Wilson's avatar Chris Wilson Committed by Greg Kroah-Hartman

drm/i915: Store a permanent error in obj->mm.pages

commit 0d9dc306 upstream.

Once the object has been truncated, it is unrecoverable. To facilitate
detection of this state store the error in obj->mm.pages.

This is required for the next patch which should be applied to v4.10
(via stable), so we also need to mark this patch for backporting. In
that regard, let's consider this to be a fix/improvement too.

v2: Avoid dereferencing the ERR_PTR when freeing the object.

Fixes: 1233e2db ("drm/i915: Move object backing storage manipulation to its own locking")
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170307132031.32461-1-chris@chris-wilson.co.ukReviewed-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
(cherry picked from commit 4e5462ee)
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 432ae452
......@@ -2184,6 +2184,7 @@ i915_gem_object_truncate(struct drm_i915_gem_object *obj)
*/
shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
obj->mm.madv = __I915_MADV_PURGED;
obj->mm.pages = ERR_PTR(-EFAULT);
}
/* Try to discard unwanted pages */
......@@ -2283,7 +2284,9 @@ void __i915_gem_object_put_pages(struct drm_i915_gem_object *obj,
__i915_gem_object_reset_page_iter(obj);
obj->ops->put_pages(obj, pages);
if (!IS_ERR(pages))
obj->ops->put_pages(obj, pages);
unlock:
mutex_unlock(&obj->mm.lock);
}
......@@ -2501,7 +2504,7 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
if (err)
return err;
if (unlikely(!obj->mm.pages)) {
if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) {
err = ____i915_gem_object_get_pages(obj);
if (err)
goto unlock;
......@@ -2579,7 +2582,7 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
pinned = true;
if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) {
if (unlikely(!obj->mm.pages)) {
if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) {
ret = ____i915_gem_object_get_pages(obj);
if (ret)
goto err_unlock;
......
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