| Message ID | 20190202154158.10443-2-robh@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Add reservation_object to drm_gem_object | expand |
On Sat, Feb 02, 2019 at 09:41:54AM -0600, Rob Herring wrote: > 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> > --- > v2: > - Fix missing kerneldoc > - Reword todo with what is left todo. > - Fix timeout error handling (added to drm_gem_reservation_object_wait) Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> > > Documentation/gpu/todo.rst | 8 +++---- > drivers/gpu/drm/drm_gem.c | 43 +++++++++++++++++++++++++++++++++++++ > drivers/gpu/drm/drm_prime.c | 1 + > include/drm/drm_gem.h | 21 ++++++++++++++++++ > 4 files changed, 69 insertions(+), 4 deletions(-) > > diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst > index 14191b64446d..c9ed55605641 100644 > --- a/Documentation/gpu/todo.rst > +++ b/Documentation/gpu/todo.rst > @@ -209,12 +209,12 @@ 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 > +Remove the ->gem_prime_res_obj callback > -------------------------------------------- > > -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. > +The ->gem_prime_res_obj callback can be removed from drivers by using the > +reservation_object in the drm_gem_object. It may also be possible to use the > +generic drm_gem_reservation_object_wait helper for waiting for a bo. > > Contact: Daniel Vetter > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c > index 8b55ece97967..b09acbc5a655 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; > + reservation_object_init(&obj->_resv); > + if (!obj->resv) > + obj->resv = &obj->_resv; > + > drm_vma_node_reset(&obj->vma_node); > } > EXPORT_SYMBOL(drm_gem_private_object_init); > @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle) > } > EXPORT_SYMBOL(drm_gem_object_lookup); > > +/** > + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects > + * shared and/or exclusive fences. > + * @filep: 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); > + if (ret == 0) > + ret = -ETIME; > + else if (ret > 0) > + ret = 0; > + > + 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 +863,7 @@ 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..25f1ff2df464 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 +263,24 @@ struct drm_gem_object { > */ > struct dma_buf_attachment *import_attach; > > + /** > + * @resv: > + * > + * Pointer to reservation object associated with the this GEM object. > + * > + * Normally (@resv == &@_resv) except for imported GEM objects. > + */ > + struct reservation_object *resv; > + > + /** > + * @_resv: > + * > + * A reservation object for this GEM object. > + * > + * This is unused for imported GEM objects. > + */ > + struct reservation_object _resv; > + > /** > * @funcs: > * > @@ -363,6 +382,8 @@ 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, > -- > 2.19.1 >
Rob Herring <robh@kernel.org> writes: > 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. 1, 4, 5 are: Reviewed-by: Eric Anholt <eric@anholt.net>
Am Sa., 2. Feb. 2019 um 16:42 Uhr schrieb Rob Herring <robh@kernel.org>: > > 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> Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com> > --- > v2: > - Fix missing kerneldoc > - Reword todo with what is left todo. > - Fix timeout error handling (added to drm_gem_reservation_object_wait) > > Documentation/gpu/todo.rst | 8 +++---- > drivers/gpu/drm/drm_gem.c | 43 +++++++++++++++++++++++++++++++++++++ > drivers/gpu/drm/drm_prime.c | 1 + > include/drm/drm_gem.h | 21 ++++++++++++++++++ > 4 files changed, 69 insertions(+), 4 deletions(-) > > diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst > index 14191b64446d..c9ed55605641 100644 > --- a/Documentation/gpu/todo.rst > +++ b/Documentation/gpu/todo.rst > @@ -209,12 +209,12 @@ 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 > +Remove the ->gem_prime_res_obj callback > -------------------------------------------- > > -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. > +The ->gem_prime_res_obj callback can be removed from drivers by using the > +reservation_object in the drm_gem_object. It may also be possible to use the > +generic drm_gem_reservation_object_wait helper for waiting for a bo. > > Contact: Daniel Vetter > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c > index 8b55ece97967..b09acbc5a655 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; > + reservation_object_init(&obj->_resv); > + if (!obj->resv) > + obj->resv = &obj->_resv; > + > drm_vma_node_reset(&obj->vma_node); > } > EXPORT_SYMBOL(drm_gem_private_object_init); > @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle) > } > EXPORT_SYMBOL(drm_gem_object_lookup); > > +/** > + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects > + * shared and/or exclusive fences. > + * @filep: 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); > + if (ret == 0) > + ret = -ETIME; > + else if (ret > 0) > + ret = 0; > + > + 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 +863,7 @@ 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..25f1ff2df464 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 +263,24 @@ struct drm_gem_object { > */ > struct dma_buf_attachment *import_attach; > > + /** > + * @resv: > + * > + * Pointer to reservation object associated with the this GEM object. > + * > + * Normally (@resv == &@_resv) except for imported GEM objects. > + */ > + struct reservation_object *resv; > + > + /** > + * @_resv: > + * > + * A reservation object for this GEM object. > + * > + * This is unused for imported GEM objects. > + */ > + struct reservation_object _resv; > + > /** > * @funcs: > * > @@ -363,6 +382,8 @@ 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, > -- > 2.19.1 >
On Fri, Feb 08, 2019 at 08:23:44AM +0100, Christian Gmeiner wrote: > Am Sa., 2. Feb. 2019 um 16:42 Uhr schrieb Rob Herring <robh@kernel.org>: > > > > 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> > > Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com> Does this extend to 2/5 to update etnaviv? -Daniel > > > --- > > v2: > > - Fix missing kerneldoc > > - Reword todo with what is left todo. > > - Fix timeout error handling (added to drm_gem_reservation_object_wait) > > > > Documentation/gpu/todo.rst | 8 +++---- > > drivers/gpu/drm/drm_gem.c | 43 +++++++++++++++++++++++++++++++++++++ > > drivers/gpu/drm/drm_prime.c | 1 + > > include/drm/drm_gem.h | 21 ++++++++++++++++++ > > 4 files changed, 69 insertions(+), 4 deletions(-) > > > > diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst > > index 14191b64446d..c9ed55605641 100644 > > --- a/Documentation/gpu/todo.rst > > +++ b/Documentation/gpu/todo.rst > > @@ -209,12 +209,12 @@ 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 > > +Remove the ->gem_prime_res_obj callback > > -------------------------------------------- > > > > -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. > > +The ->gem_prime_res_obj callback can be removed from drivers by using the > > +reservation_object in the drm_gem_object. It may also be possible to use the > > +generic drm_gem_reservation_object_wait helper for waiting for a bo. > > > > Contact: Daniel Vetter > > > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c > > index 8b55ece97967..b09acbc5a655 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; > > + reservation_object_init(&obj->_resv); > > + if (!obj->resv) > > + obj->resv = &obj->_resv; > > + > > drm_vma_node_reset(&obj->vma_node); > > } > > EXPORT_SYMBOL(drm_gem_private_object_init); > > @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle) > > } > > EXPORT_SYMBOL(drm_gem_object_lookup); > > > > +/** > > + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects > > + * shared and/or exclusive fences. > > + * @filep: 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); > > + if (ret == 0) > > + ret = -ETIME; > > + else if (ret > 0) > > + ret = 0; > > + > > + 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 +863,7 @@ 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..25f1ff2df464 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 +263,24 @@ struct drm_gem_object { > > */ > > struct dma_buf_attachment *import_attach; > > > > + /** > > + * @resv: > > + * > > + * Pointer to reservation object associated with the this GEM object. > > + * > > + * Normally (@resv == &@_resv) except for imported GEM objects. > > + */ > > + struct reservation_object *resv; > > + > > + /** > > + * @_resv: > > + * > > + * A reservation object for this GEM object. > > + * > > + * This is unused for imported GEM objects. > > + */ > > + struct reservation_object _resv; > > + > > /** > > * @funcs: > > * > > @@ -363,6 +382,8 @@ 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, > > -- > > 2.19.1 > > > > > -- > greets > -- > Christian Gmeiner, MSc > > https://christian-gmeiner.info
Am Di., 12. Feb. 2019 um 15:16 Uhr schrieb Daniel Vetter <daniel@ffwll.ch>: > > On Fri, Feb 08, 2019 at 08:23:44AM +0100, Christian Gmeiner wrote: > > Am Sa., 2. Feb. 2019 um 16:42 Uhr schrieb Rob Herring <robh@kernel.org>: > > > > > > 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> > > > > Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com> > > Does this extend to 2/5 to update etnaviv? oopps... yes it does - see my reply to 2/5. > -Daniel > > > > > > --- > > > v2: > > > - Fix missing kerneldoc > > > - Reword todo with what is left todo. > > > - Fix timeout error handling (added to drm_gem_reservation_object_wait) > > > > > > Documentation/gpu/todo.rst | 8 +++---- > > > drivers/gpu/drm/drm_gem.c | 43 +++++++++++++++++++++++++++++++++++++ > > > drivers/gpu/drm/drm_prime.c | 1 + > > > include/drm/drm_gem.h | 21 ++++++++++++++++++ > > > 4 files changed, 69 insertions(+), 4 deletions(-) > > > > > > diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst > > > index 14191b64446d..c9ed55605641 100644 > > > --- a/Documentation/gpu/todo.rst > > > +++ b/Documentation/gpu/todo.rst > > > @@ -209,12 +209,12 @@ 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 > > > +Remove the ->gem_prime_res_obj callback > > > -------------------------------------------- > > > > > > -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. > > > +The ->gem_prime_res_obj callback can be removed from drivers by using the > > > +reservation_object in the drm_gem_object. It may also be possible to use the > > > +generic drm_gem_reservation_object_wait helper for waiting for a bo. > > > > > > Contact: Daniel Vetter > > > > > > diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c > > > index 8b55ece97967..b09acbc5a655 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; > > > + reservation_object_init(&obj->_resv); > > > + if (!obj->resv) > > > + obj->resv = &obj->_resv; > > > + > > > drm_vma_node_reset(&obj->vma_node); > > > } > > > EXPORT_SYMBOL(drm_gem_private_object_init); > > > @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle) > > > } > > > EXPORT_SYMBOL(drm_gem_object_lookup); > > > > > > +/** > > > + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects > > > + * shared and/or exclusive fences. > > > + * @filep: 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); > > > + if (ret == 0) > > > + ret = -ETIME; > > > + else if (ret > 0) > > > + ret = 0; > > > + > > > + 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 +863,7 @@ 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..25f1ff2df464 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 +263,24 @@ struct drm_gem_object { > > > */ > > > struct dma_buf_attachment *import_attach; > > > > > > + /** > > > + * @resv: > > > + * > > > + * Pointer to reservation object associated with the this GEM object. > > > + * > > > + * Normally (@resv == &@_resv) except for imported GEM objects. > > > + */ > > > + struct reservation_object *resv; > > > + > > > + /** > > > + * @_resv: > > > + * > > > + * A reservation object for this GEM object. > > > + * > > > + * This is unused for imported GEM objects. > > > + */ > > > + struct reservation_object _resv; > > > + > > > /** > > > * @funcs: > > > * > > > @@ -363,6 +382,8 @@ 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, > > > -- > > > 2.19.1 > > > > > > > > > -- > > greets > > -- > > Christian Gmeiner, MSc > > > > https://christian-gmeiner.info > > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch
diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst index 14191b64446d..c9ed55605641 100644 --- a/Documentation/gpu/todo.rst +++ b/Documentation/gpu/todo.rst @@ -209,12 +209,12 @@ 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 +Remove the ->gem_prime_res_obj callback -------------------------------------------- -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. +The ->gem_prime_res_obj callback can be removed from drivers by using the +reservation_object in the drm_gem_object. It may also be possible to use the +generic drm_gem_reservation_object_wait helper for waiting for a bo. Contact: Daniel Vetter diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 8b55ece97967..b09acbc5a655 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; + reservation_object_init(&obj->_resv); + if (!obj->resv) + obj->resv = &obj->_resv; + drm_vma_node_reset(&obj->vma_node); } EXPORT_SYMBOL(drm_gem_private_object_init); @@ -657,6 +661,44 @@ drm_gem_object_lookup(struct drm_file *filp, u32 handle) } EXPORT_SYMBOL(drm_gem_object_lookup); +/** + * drm_gem_reservation_object_wait - Wait on GEM object's reservation's objects + * shared and/or exclusive fences. + * @filep: 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); + if (ret == 0) + ret = -ETIME; + else if (ret > 0) + ret = 0; + + 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 +863,7 @@ 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..25f1ff2df464 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 +263,24 @@ struct drm_gem_object { */ struct dma_buf_attachment *import_attach; + /** + * @resv: + * + * Pointer to reservation object associated with the this GEM object. + * + * Normally (@resv == &@_resv) except for imported GEM objects. + */ + struct reservation_object *resv; + + /** + * @_resv: + * + * A reservation object for this GEM object. + * + * This is unused for imported GEM objects. + */ + struct reservation_object _resv; + /** * @funcs: * @@ -363,6 +382,8 @@ 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,
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> --- v2: - Fix missing kerneldoc - Reword todo with what is left todo. - Fix timeout error handling (added to drm_gem_reservation_object_wait) Documentation/gpu/todo.rst | 8 +++---- drivers/gpu/drm/drm_gem.c | 43 +++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/drm_prime.c | 1 + include/drm/drm_gem.h | 21 ++++++++++++++++++ 4 files changed, 69 insertions(+), 4 deletions(-)