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gma500: enable GEM mmap

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Support mapping of GEM objects. This ought to be a small plumbing change but
instead we have to cut and paste a pile of stuff into the driver. This
really wants to be handled *IN* GEM

You can now allocate, mmap and munmap GEM objects in the driver. You can't
yet map them into the GART or display them however.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2011-05-10 21:27:31 +01:00 committed by Greg Kroah-Hartman
parent 1dce160f02
commit 0c4ac072b3
2 changed files with 84 additions and 6 deletions
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4
drivers/staging/gma500/psb_drv.c
View file

@ -1403,11 +1403,11 @@ static struct drm_driver driver = {
.open = drm_open,
.release = drm_release,
.unlocked_ioctl = psb_unlocked_ioctl,
.mmap = drm_mmap,
.mmap = drm_gem_mmap,
.poll = drm_poll,
.fasync = drm_fasync,
.read = drm_read,
},
},
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = PSB_DRM_DRIVER_DATE,

86
drivers/staging/gma500/psb_gem.c
View file

@ -41,6 +41,15 @@ void psb_gem_free_object(struct drm_gem_object *obj)
{
struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
psb_gtt_free_range(obj->dev, gtt);
if (obj->map_list.map) {
/* Do things GEM should do for us */
struct drm_gem_mm *mm = obj->dev->mm_private;
struct drm_map_list *list = &obj->map_list;
drm_ht_remove_item(&mm->offset_hash, &list->hash);
drm_mm_put_block(list->file_offset_node);
kfree(list->map);
list->map = NULL;
}
drm_gem_object_release(obj);
}
@ -50,6 +59,59 @@ int psb_gem_get_aperture(struct drm_device *dev, void *data,
return -EINVAL;
}
/**
* psb_gem_create_mmap_offset - invent an mmap offset
* @obj: our object
*
* This is basically doing by hand a pile of ugly crap which should
* be done automatically by the GEM library code but isn't
*/
static int psb_gem_create_mmap_offset(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_local_map *map;
int ret;
list = &obj->map_list;
list->map = kzalloc(sizeof(struct drm_map_list), GFP_KERNEL);
if (list->map == NULL)
return -ENOMEM;
map = list->map;
map->type = _DRM_GEM;
map->size = obj->size;
map->handle =obj;
list->file_offset_node = drm_mm_search_free(&mm->offset_manager,
obj->size / PAGE_SIZE, 0, 0);
if (!list->file_offset_node) {
DRM_ERROR("failed to allocate offset for bo %d\n", obj->name);
ret = -ENOSPC;
goto free_it;
}
list->file_offset_node = drm_mm_get_block(list->file_offset_node,
obj->size / PAGE_SIZE, 0);
if (!list->file_offset_node) {
ret = -ENOMEM;
goto free_it;
}
list->hash.key = list->file_offset_node->start;
ret = drm_ht_insert_item(&mm->offset_hash, &list->hash);
if (ret) {
DRM_ERROR("failed to add to map hash\n");
goto free_mm;
}
return 0;
free_mm:
drm_mm_put_block(list->file_offset_node);
free_it:
kfree(list->map);
list->map = NULL;
return ret;
}
/**
* psb_gem_dumb_map_gtt - buffer mapping for dumb interface
* @file: our drm client file
@ -62,19 +124,35 @@ int psb_gem_get_aperture(struct drm_device *dev, void *data,
int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev,
uint32_t handle, uint64_t *offset)
{
int ret = 0;
struct drm_gem_object *obj;
if (!(dev->driver->driver_features & DRIVER_GEM))
return -ENODEV;
mutex_lock(&dev->struct_mutex);
/* GEM does all our handle to object mapping */
obj = drm_gem_object_lookup(dev, file, handle);
if (obj == NULL)
return -ENOENT;
if (obj == NULL) {
ret = -ENOENT;
goto unlock;
}
/* What validation is needed here ? */
/* GEM works out the hash offsets for us */
/* Make it mmapable */
if (!obj->map_list.map) {
ret = psb_gem_create_mmap_offset(obj);
if (ret)
goto out;
}
/* GEM should really work out the hash offsets for us */
*offset = (u64)obj->map_list.hash.key << PAGE_SHIFT;
out:
drm_gem_object_unreference(obj);
return 0;
unlock:
mutex_unlock(&dev->struct_mutex);
return ret;
}
/**