Many users of drm_gem_object embed a struct reservation_object into their subclassed struct, so let's add one to struct drm_gem_object. This will allow removing the reservation object from the subclasses and removing the ->gem_prime_res_obj callback.
With the addition, add a drm_gem_reservation_object_wait() helper function for drivers to use in wait ioctls.
Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard maxime.ripard@bootlin.com Cc: Sean Paul sean@poorly.run Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Rob Herring robh@kernel.org --- Documentation/gpu/todo.rst | 9 --------- drivers/gpu/drm/drm_gem.c | 39 +++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_prime.c | 1 + include/drm/drm_gem.h | 7 +++++++ 4 files changed, 47 insertions(+), 9 deletions(-)
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 14191b64446d..6e0a37d0bf6d 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -209,15 +209,6 @@ Would be great to refactor this all into a set of small common helpers.
Contact: Daniel Vetter
-Put a reservation_object into drm_gem_object --------------------------------------------- - -This would remove the need for the ->gem_prime_res_obj callback. It would also -allow us to implement generic helpers for waiting for a bo, allowing for quite a -bit of refactoring in the various wait ioctl implementations. - -Contact: Daniel Vetter - idr_init_base() ---------------
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 8b55ece97967..91dd06c1b3a8 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -170,6 +170,10 @@ void drm_gem_private_object_init(struct drm_device *dev, kref_init(&obj->refcount); obj->handle_count = 0; obj->size = size; + if (!obj->resv) { + obj->resv = &obj->_resv; + reservation_object_init(obj->resv); + } drm_vma_node_reset(&obj->vma_node); } EXPORT_SYMBOL(drm_gem_private_object_init); @@ -657,6 +661,40 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle) } EXPORT_SYMBOL(drm_gem_object_lookup);
+/** + * drm_gem_object_lookup - Wait on GEM object's reservation's objects + * shared and/or exclusive fences. + * @filp: DRM file private date + * @handle: userspace handle + * @wait_all: if true, wait on all fences, else wait on just exclusive fence + * @timeout: timeout value in jiffies or zero to return immediately + * + * Returns: + * + * Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or + * greater than 0 on success. + */ +long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle, + bool wait_all, unsigned long timeout) +{ + long ret; + struct drm_gem_object *obj; + + obj = drm_gem_object_lookup(filep, handle); + if (!obj) { + DRM_DEBUG("Failed to look up GEM BO %d\n", handle); + return -EINVAL; + } + + ret = reservation_object_wait_timeout_rcu(obj->resv, wait_all, + true, timeout); + + drm_gem_object_put_unlocked(obj); + + return ret; +} +EXPORT_SYMBOL(drm_gem_reservation_object_wait); + /** * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl * @dev: drm_device @@ -821,6 +859,7 @@ drm_gem_object_release(struct drm_gem_object *obj) if (obj->filp) fput(obj->filp);
+ reservation_object_fini(&obj->_resv); drm_gem_free_mmap_offset(obj); } EXPORT_SYMBOL(drm_gem_object_release); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 231e3f6d5f41..dc079efb3b0f 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -504,6 +504,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev, .size = obj->size, .flags = flags, .priv = obj, + .resv = obj->resv, };
if (dev->driver->gem_prime_res_obj) diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index c95727425284..f450a5b6038e 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -35,6 +35,7 @@ */
#include <linux/kref.h> +#include <linux/reservation.h>
#include <drm/drm_vma_manager.h>
@@ -262,6 +263,10 @@ struct drm_gem_object { */ struct dma_buf_attachment *import_attach;
+ /* normally (resv == &_resv) except for imported bo's */ + struct reservation_object *resv; + struct reservation_object _resv; + /** * @funcs: * @@ -363,6 +368,8 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, bool dirty, bool accessed);
struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle); +long drm_gem_reservation_object_wait(struct drm_file *filep, u32 handle, + bool wait_all, unsigned long timeout); int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, u32 handle, u64 *offset); int drm_gem_dumb_destroy(struct drm_file *file,