[PATCH 6/7] drm/nouveau: embed gem object in nouveau_bo
David Herrmann
dh.herrmann at gmail.com
Wed Aug 14 06:07:19 PDT 2013
There is no reason to keep the gem object separately allocated. nouveau is
the last user of gem_obj->driver_private, so if we embed it, we can get
rid of 8bytes per gem-object.
The implementation follows the radeon driver. bo->gem is only valid, iff
the bo was created via the gem helpers _and_ iff the user holds a valid
gem reference. That is, as the gem object holds a reference to the
nouveau_bo. If you use nouveau_ref() to gain a bo reference, you are not
guaranteed to also hold a gem reference. The gem object might get
destroyed after the last user drops the gem-ref via
drm_gem_object_unreference(). Use drm_gem_object_reference() to gain a
gem-reference.
For debugging, we can use bo->gem.filp != NULL to test whether a gem-bo is
valid. However, this shouldn't be used for real functionality to avoid
gem-internal dependencies.
Note that the implementation follows the previous style. However, we no
longer can check for bo->gem != NULL to test for a valid gem object. This
wasn't done before, so we should be safe now.
Cc: Ben Skeggs <skeggsb at gmail.com>
Cc: Maarten Lankhorst <maarten.lankhorst at canonical.com>
Cc: Martin Peres <martin.peres at labri.fr>
Signed-off-by: David Herrmann <dh.herrmann at gmail.com>
---
drivers/gpu/drm/nouveau/nouveau_abi16.c | 4 ++--
drivers/gpu/drm/nouveau/nouveau_bo.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_bo.h | 5 ++++-
drivers/gpu/drm/nouveau/nouveau_display.c | 10 ++++-----
drivers/gpu/drm/nouveau/nouveau_fbcon.c | 2 +-
drivers/gpu/drm/nouveau/nouveau_gem.c | 36 +++++++++++++++----------------
drivers/gpu/drm/nouveau/nouveau_gem.h | 2 +-
drivers/gpu/drm/nouveau/nouveau_prime.c | 10 +++++----
8 files changed, 37 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c
index 8f467e7..3897549 100644
--- a/drivers/gpu/drm/nouveau/nouveau_abi16.c
+++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c
@@ -130,7 +130,7 @@ nouveau_abi16_chan_fini(struct nouveau_abi16 *abi16,
if (chan->ntfy) {
nouveau_bo_vma_del(chan->ntfy, &chan->ntfy_vma);
nouveau_bo_unpin(chan->ntfy);
- drm_gem_object_unreference_unlocked(chan->ntfy->gem);
+ drm_gem_object_unreference_unlocked(&chan->ntfy->gem);
}
if (chan->heap.block_size)
@@ -320,7 +320,7 @@ nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
goto done;
}
- ret = drm_gem_handle_create(file_priv, chan->ntfy->gem,
+ ret = drm_gem_handle_create(file_priv, &chan->ntfy->gem,
&init->notifier_handle);
if (ret)
goto done;
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 4e7ee5f..7767a89 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -146,7 +146,7 @@ nouveau_bo_del_ttm(struct ttm_buffer_object *bo)
struct drm_device *dev = drm->dev;
struct nouveau_bo *nvbo = nouveau_bo(bo);
- if (unlikely(nvbo->gem))
+ if (unlikely(nvbo->gem.filp))
DRM_ERROR("bo %p still attached to GEM object\n", bo);
WARN_ON(nvbo->pin_refcnt > 0);
nv10_bo_put_tile_region(dev, nvbo->tile, NULL);
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
index 653dbbb..ff17c1f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
@@ -27,7 +27,10 @@ struct nouveau_bo {
u32 tile_flags;
struct nouveau_drm_tile *tile;
- struct drm_gem_object *gem;
+ /* Only valid if allocated via nouveau_gem_new() and iff you hold a
+ * gem reference to it! For debugging, use gem.filp != NULL to test
+ * whether it is valid. */
+ struct drm_gem_object gem;
/* protect by the ttm reservation lock */
int pin_refcnt;
diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 78637af..85571ed 100644
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -50,7 +50,7 @@ nouveau_user_framebuffer_destroy(struct drm_framebuffer *drm_fb)
struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);
if (fb->nvbo)
- drm_gem_object_unreference_unlocked(fb->nvbo->gem);
+ drm_gem_object_unreference_unlocked(&fb->nvbo->gem);
drm_framebuffer_cleanup(drm_fb);
kfree(fb);
@@ -63,7 +63,7 @@ nouveau_user_framebuffer_create_handle(struct drm_framebuffer *drm_fb,
{
struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb);
- return drm_gem_handle_create(file_priv, fb->nvbo->gem, handle);
+ return drm_gem_handle_create(file_priv, &fb->nvbo->gem, handle);
}
static const struct drm_framebuffer_funcs nouveau_framebuffer_funcs = {
@@ -668,8 +668,8 @@ nouveau_display_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
if (ret)
return ret;
- ret = drm_gem_handle_create(file_priv, bo->gem, &args->handle);
- drm_gem_object_unreference_unlocked(bo->gem);
+ ret = drm_gem_handle_create(file_priv, &bo->gem, &args->handle);
+ drm_gem_object_unreference_unlocked(&bo->gem);
return ret;
}
@@ -682,7 +682,7 @@ nouveau_display_dumb_map_offset(struct drm_file *file_priv,
gem = drm_gem_object_lookup(dev, file_priv, handle);
if (gem) {
- struct nouveau_bo *bo = gem->driver_private;
+ struct nouveau_bo *bo = nouveau_gem_object(gem);
*poffset = drm_vma_node_offset_addr(&bo->bo.vma_node);
drm_gem_object_unreference_unlocked(gem);
return 0;
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 4c1bc06..e20b695 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -419,7 +419,7 @@ nouveau_fbcon_destroy(struct drm_device *dev, struct nouveau_fbdev *fbcon)
nouveau_bo_unmap(nouveau_fb->nvbo);
nouveau_bo_vma_del(nouveau_fb->nvbo, &nouveau_fb->vma);
nouveau_bo_unpin(nouveau_fb->nvbo);
- drm_gem_object_unreference_unlocked(nouveau_fb->nvbo->gem);
+ drm_gem_object_unreference_unlocked(&nouveau_fb->nvbo->gem);
nouveau_fb->nvbo = NULL;
}
drm_fb_helper_fini(&fbcon->helper);
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 487242f..39278e9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -43,20 +43,17 @@ nouveau_gem_object_new(struct drm_gem_object *gem)
void
nouveau_gem_object_del(struct drm_gem_object *gem)
{
- struct nouveau_bo *nvbo = gem->driver_private;
+ struct nouveau_bo *nvbo = nouveau_gem_object(gem);
struct ttm_buffer_object *bo = &nvbo->bo;
- if (!nvbo)
- return;
- nvbo->gem = NULL;
-
if (gem->import_attach)
drm_prime_gem_destroy(gem, nvbo->bo.sg);
- ttm_bo_unref(&bo);
-
drm_gem_object_release(gem);
- kfree(gem);
+
+ /* reset filp so nouveau_bo_del_ttm() can test for it */
+ gem->filp = NULL;
+ ttm_bo_unref(&bo);
}
int
@@ -186,14 +183,15 @@ nouveau_gem_new(struct drm_device *dev, int size, int align, uint32_t domain,
if (nv_device(drm->device)->card_type >= NV_50)
nvbo->valid_domains &= domain;
- nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
- if (!nvbo->gem) {
+ /* Initialize the embedded gem-object. We return a single gem-reference
+ * to the caller, instead of a normal nouveau_bo ttm reference. */
+ ret = drm_gem_object_init(dev, &nvbo->gem, nvbo->bo.mem.size);
+ if (ret) {
nouveau_bo_ref(NULL, pnvbo);
return -ENOMEM;
}
- nvbo->bo.persistent_swap_storage = nvbo->gem->filp;
- nvbo->gem->driver_private = nvbo;
+ nvbo->bo.persistent_swap_storage = nvbo->gem.filp;
return 0;
}
@@ -250,15 +248,15 @@ nouveau_gem_ioctl_new(struct drm_device *dev, void *data,
if (ret)
return ret;
- ret = drm_gem_handle_create(file_priv, nvbo->gem, &req->info.handle);
+ ret = drm_gem_handle_create(file_priv, &nvbo->gem, &req->info.handle);
if (ret == 0) {
- ret = nouveau_gem_info(file_priv, nvbo->gem, &req->info);
+ ret = nouveau_gem_info(file_priv, &nvbo->gem, &req->info);
if (ret)
drm_gem_handle_delete(file_priv, req->info.handle);
}
/* drop reference from allocate - handle holds it now */
- drm_gem_object_unreference_unlocked(nvbo->gem);
+ drm_gem_object_unreference_unlocked(&nvbo->gem);
return ret;
}
@@ -266,7 +264,7 @@ static int
nouveau_gem_set_domain(struct drm_gem_object *gem, uint32_t read_domains,
uint32_t write_domains, uint32_t valid_domains)
{
- struct nouveau_bo *nvbo = gem->driver_private;
+ struct nouveau_bo *nvbo = nouveau_gem_object(gem);
struct ttm_buffer_object *bo = &nvbo->bo;
uint32_t domains = valid_domains & nvbo->valid_domains &
(write_domains ? write_domains : read_domains);
@@ -327,7 +325,7 @@ validate_fini_list(struct list_head *list, struct nouveau_fence *fence,
list_del(&nvbo->entry);
nvbo->reserved_by = NULL;
ttm_bo_unreserve_ticket(&nvbo->bo, ticket);
- drm_gem_object_unreference_unlocked(nvbo->gem);
+ drm_gem_object_unreference_unlocked(&nvbo->gem);
}
}
@@ -376,7 +374,7 @@ retry:
validate_fini(op, NULL);
return -ENOENT;
}
- nvbo = gem->driver_private;
+ nvbo = nouveau_gem_object(gem);
if (nvbo == res_bo) {
res_bo = NULL;
drm_gem_object_unreference_unlocked(gem);
@@ -478,7 +476,7 @@ validate_list(struct nouveau_channel *chan, struct nouveau_cli *cli,
return ret;
}
- ret = nouveau_gem_set_domain(nvbo->gem, b->read_domains,
+ ret = nouveau_gem_set_domain(&nvbo->gem, b->read_domains,
b->write_domains,
b->valid_domains);
if (unlikely(ret)) {
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.h b/drivers/gpu/drm/nouveau/nouveau_gem.h
index 502e429..b535895 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.h
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.h
@@ -12,7 +12,7 @@
static inline struct nouveau_bo *
nouveau_gem_object(struct drm_gem_object *gem)
{
- return gem ? gem->driver_private : NULL;
+ return gem ? container_of(gem, struct nouveau_bo, gem) : NULL;
}
/* nouveau_gem.c */
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index e90468d..51a2cb1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -71,14 +71,16 @@ struct drm_gem_object *nouveau_gem_prime_import_sg_table(struct drm_device *dev,
return ERR_PTR(ret);
nvbo->valid_domains = NOUVEAU_GEM_DOMAIN_GART;
- nvbo->gem = drm_gem_object_alloc(dev, nvbo->bo.mem.size);
- if (!nvbo->gem) {
+
+ /* Initialize the embedded gem-object. We return a single gem-reference
+ * to the caller, instead of a normal nouveau_bo ttm reference. */
+ ret = drm_gem_object_init(dev, &nvbo->gem, nvbo->bo.mem.size);
+ if (ret) {
nouveau_bo_ref(NULL, &nvbo);
return ERR_PTR(-ENOMEM);
}
- nvbo->gem->driver_private = nvbo;
- return nvbo->gem;
+ return &nvbo->gem;
}
int nouveau_gem_prime_pin(struct drm_gem_object *obj)
--
1.8.3.4
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