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drm/i915: Keep refs on the object over the lifetime of vmas for GTT mmap.

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This fixes potential fault at fault time if the object was unreferenced
while the mapping still existed.  Now, while the mmap_offset only lives
for the lifetime of the object, the object also stays alive while a vma
exists that needs it.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jesse Barnes
2009-02-11 14:01:46 -08:00
committed by Dave Airlie
parent 496818f08a
commit ab00b3e521
4 changed files with 57 additions and 18 deletions
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43
drivers/gpu/drm/i915/i915_gem.c
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@@ -607,8 +607,6 @@ int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
case -EAGAIN:
return VM_FAULT_OOM;
case -EFAULT:
case -EBUSY:
DRM_ERROR("can't insert pfn?? fault or busy...\n");
return VM_FAULT_SIGBUS;
default:
return VM_FAULT_NOPAGE;
@@ -684,6 +682,30 @@ out_free_list:
return ret;
}
static void
i915_gem_free_mmap_offset(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct drm_i915_gem_object *obj_priv = obj->driver_private;
struct drm_gem_mm *mm = dev->mm_private;
struct drm_map_list *list;
list = &obj->map_list;
drm_ht_remove_item(&mm->offset_hash, &list->hash);
if (list->file_offset_node) {
drm_mm_put_block(list->file_offset_node);
list->file_offset_node = NULL;
}
if (list->map) {
drm_free(list->map, sizeof(struct drm_map), DRM_MEM_DRIVER);
list->map = NULL;
}
obj_priv->mmap_offset = 0;
}
/**
* i915_gem_get_gtt_alignment - return required GTT alignment for an object
* @obj: object to check
@@ -2896,9 +2918,6 @@ int i915_gem_init_object(struct drm_gem_object *obj)
void i915_gem_free_object(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct drm_gem_mm *mm = dev->mm_private;
struct drm_map_list *list;
struct drm_map *map;
struct drm_i915_gem_object *obj_priv = obj->driver_private;
while (obj_priv->pin_count > 0)
@@ -2909,19 +2928,7 @@ void i915_gem_free_object(struct drm_gem_object *obj)
i915_gem_object_unbind(obj);
list = &obj->map_list;
drm_ht_remove_item(&mm->offset_hash, &list->hash);
if (list->file_offset_node) {
drm_mm_put_block(list->file_offset_node);
list->file_offset_node = NULL;
}
map = list->map;
if (map) {
drm_free(map, sizeof(*map), DRM_MEM_DRIVER);
list->map = NULL;
}
i915_gem_free_mmap_offset(obj);
drm_free(obj_priv->page_cpu_valid, 1, DRM_MEM_DRIVER);
drm_free(obj->driver_private, 1, DRM_MEM_DRIVER);