Dan Carpenter
2021-Dec-07 08:55 UTC
[PATCH] drm: Return error codes from struct drm_driver.gem_create_object
I appologize. This thread has been really frustrating. I got mixed up because I recently sent patches for ingenic and vc4. Also we are working against different trees so maybe that is part of the problem? I'm looking at today's linux-next. Your patch has been applied. Yes. You updated all the drivers. But somehow the vc4 chunk from your patch was dropped. It was *NOT* dropped by Stephen Rothwell. It got dropped earlier. I am including the `git format-patch -1 <hash>` output from the commit. regards, dan carpenter>From 4ff22f487f8c26b99cbe1678344595734c001a39 Mon Sep 17 00:00:00 2001From: Thomas Zimmermann <tzimmermann at suse.de> Date: Tue, 30 Nov 2021 10:52:55 +0100 Subject: [PATCH] drm: Return error codes from struct drm_driver.gem_create_object GEM helper libraries use struct drm_driver.gem_create_object to let drivers override GEM object allocation. On failure, the call returns NULL. Change the semantics to make the calls return a pointer-encoded error. This aligns the callback with its callers. Fixes the ingenic driver, which already returns an error pointer. Also update the callers to handle the involved types more strictly. Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de> Reviewed-by: Steven Price <steven.price at arm.com> Acked-by: Maxime Ripard <maxime at cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20211130095255.26710-1-tzimmermann at suse.de --- drivers/gpu/drm/drm_gem_cma_helper.c | 17 ++++++++++------- drivers/gpu/drm/drm_gem_shmem_helper.c | 17 ++++++++++------- drivers/gpu/drm/drm_gem_vram_helper.c | 4 ++-- drivers/gpu/drm/lima/lima_gem.c | 2 +- drivers/gpu/drm/panfrost/panfrost_gem.c | 2 +- drivers/gpu/drm/v3d/v3d_bo.c | 4 ++-- drivers/gpu/drm/vgem/vgem_drv.c | 2 +- drivers/gpu/drm/virtio/virtgpu_object.c | 2 +- include/drm/drm_drv.h | 5 +++-- 9 files changed, 31 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index 5f42e44b2ab3..6f18f143dd30 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -67,18 +67,21 @@ __drm_gem_cma_create(struct drm_device *drm, size_t size, bool private) struct drm_gem_object *gem_obj; int ret = 0; - if (drm->driver->gem_create_object) + if (drm->driver->gem_create_object) { gem_obj = drm->driver->gem_create_object(drm, size); - else - gem_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); - if (!gem_obj) - return ERR_PTR(-ENOMEM); + if (IS_ERR(gem_obj)) + return ERR_CAST(gem_obj); + cma_obj = to_drm_gem_cma_obj(gem_obj); + } else { + cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL); + if (!cma_obj) + return ERR_PTR(-ENOMEM); + gem_obj = &cma_obj->base; + } if (!gem_obj->funcs) gem_obj->funcs = &drm_gem_cma_default_funcs; - cma_obj = container_of(gem_obj, struct drm_gem_cma_object, base); - if (private) { drm_gem_private_object_init(drm, gem_obj, size); diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 0eeda1012364..7915047cb041 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -56,14 +56,17 @@ __drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private) size = PAGE_ALIGN(size); - if (dev->driver->gem_create_object) + if (dev->driver->gem_create_object) { obj = dev->driver->gem_create_object(dev, size); - else - obj = kzalloc(sizeof(*shmem), GFP_KERNEL); - if (!obj) - return ERR_PTR(-ENOMEM); - - shmem = to_drm_gem_shmem_obj(obj); + if (IS_ERR(obj)) + return ERR_CAST(obj); + shmem = to_drm_gem_shmem_obj(obj); + } else { + shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); + if (!shmem) + return ERR_PTR(-ENOMEM); + obj = &shmem->base; + } if (!obj->funcs) obj->funcs = &drm_gem_shmem_funcs; diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c index bfa386b98134..3f00192215d1 100644 --- a/drivers/gpu/drm/drm_gem_vram_helper.c +++ b/drivers/gpu/drm/drm_gem_vram_helper.c @@ -197,8 +197,8 @@ struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev, if (dev->driver->gem_create_object) { gem = dev->driver->gem_create_object(dev, size); - if (!gem) - return ERR_PTR(-ENOMEM); + if (IS_ERR(gem)) + return ERR_CAST(gem); gbo = drm_gem_vram_of_gem(gem); } else { gbo = kzalloc(sizeof(*gbo), GFP_KERNEL); diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c index 2723d333c608..f9a9198ef198 100644 --- a/drivers/gpu/drm/lima/lima_gem.c +++ b/drivers/gpu/drm/lima/lima_gem.c @@ -221,7 +221,7 @@ struct drm_gem_object *lima_gem_create_object(struct drm_device *dev, size_t siz bo = kzalloc(sizeof(*bo), GFP_KERNEL); if (!bo) - return NULL; + return ERR_PTR(-ENOMEM); mutex_init(&bo->lock); INIT_LIST_HEAD(&bo->va); diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c index 6d9bdb9180cb..ead65f5fa2bc 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -223,7 +223,7 @@ struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t obj = kzalloc(sizeof(*obj), GFP_KERNEL); if (!obj) - return NULL; + return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&obj->mappings.list); mutex_init(&obj->mappings.lock); diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c index 0d9af62f69ad..6e3113f419f4 100644 --- a/drivers/gpu/drm/v3d/v3d_bo.c +++ b/drivers/gpu/drm/v3d/v3d_bo.c @@ -70,11 +70,11 @@ struct drm_gem_object *v3d_create_object(struct drm_device *dev, size_t size) struct drm_gem_object *obj; if (size == 0) - return NULL; + return ERR_PTR(-EINVAL); bo = kzalloc(sizeof(*bo), GFP_KERNEL); if (!bo) - return NULL; + return ERR_PTR(-ENOMEM); obj = &bo->base.base; obj->funcs = &v3d_gem_funcs; diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index a87eafa89e9f..c5e3e5457737 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -97,7 +97,7 @@ static struct drm_gem_object *vgem_gem_create_object(struct drm_device *dev, siz obj = kzalloc(sizeof(*obj), GFP_KERNEL); if (!obj) - return NULL; + return ERR_PTR(-ENOMEM); /* * vgem doesn't have any begin/end cpu access ioctls, therefore must use diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c index 187e10da2f17..baef2c5f2aaf 100644 --- a/drivers/gpu/drm/virtio/virtgpu_object.c +++ b/drivers/gpu/drm/virtio/virtgpu_object.c @@ -139,7 +139,7 @@ struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev, shmem = kzalloc(sizeof(*shmem), GFP_KERNEL); if (!shmem) - return NULL; + return ERR_PTR(-ENOMEM); dshmem = &shmem->base.base; dshmem->base.funcs = &virtio_gpu_shmem_funcs; diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h index da0c836fe8e1..f6159acb8856 100644 --- a/include/drm/drm_drv.h +++ b/include/drm/drm_drv.h @@ -291,8 +291,9 @@ struct drm_driver { /** * @gem_create_object: constructor for gem objects * - * Hook for allocating the GEM object struct, for use by the CMA and - * SHMEM GEM helpers. + * Hook for allocating the GEM object struct, for use by the CMA + * and SHMEM GEM helpers. Returns a GEM object on success, or an + * ERR_PTR()-encoded error code otherwise. */ struct drm_gem_object *(*gem_create_object)(struct drm_device *dev, size_t size); -- 2.20.1
Thomas Zimmermann
2021-Dec-07 09:24 UTC
[PATCH] drm: Return error codes from struct drm_driver.gem_create_object
Hi Am 07.12.21 um 09:55 schrieb Dan Carpenter:> I appologize. This thread has been really frustrating. I got mixed up > because I recently sent patches for ingenic and vc4. Also we are > working against different trees so maybe that is part of the problem? > > I'm looking at today's linux-next. Your patch has been applied. > > Yes. You updated all the drivers. But somehow the vc4 chunk from your > patch was dropped. It was *NOT* dropped by Stephen Rothwell. It got > dropped earlier. I am including the `git format-patch -1 <hash>` output > from the commit.My vc4 change is in drm-misc-next, [1] but not in drm-tip. [2] Your vc4 patch went through drm-misc-fixes. drm-tip is build automatically by our DRM tools from the various trees. The tools took my patch from drm-misc-next and your patch from drm-misc-fixes and the result was broken. Thanks for bringing this up. I'll see what I can do about it. Best regards Thomas [1] https://cgit.freedesktop.org/drm/drm-misc/tree/drivers/gpu/drm/vc4/vc4_bo.c#n394 [2] https://cgit.freedesktop.org/drm/drm-tip/tree/drivers/gpu/drm/vc4/vc4_bo.c -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 N?rnberg, Germany (HRB 36809, AG N?rnberg) Gesch?ftsf?hrer: Ivo Totev -------------- next part -------------- A non-text attachment was scrubbed... Name: OpenPGP_signature Type: application/pgp-signature Size: 840 bytes Desc: OpenPGP digital signature URL: <http://lists.linuxfoundation.org/pipermail/virtualization/attachments/20211207/54e496ba/attachment.sig>