Linaro-mm-sig August 2022

linaro-mm-sig@lists.linaro.org

43 participants
55 discussions

[PATCH AUTOSEL 5.15 04/23] drm/gem: Fix GEM handle release errors

by Sasha Levin

From: Jeffy Chen <jeffy.chen(a)rock-chips.com> [ Upstream commit ea2aa97ca37a9044ade001aef71dbc06318e8d44 ] Currently we are assuming a one to one mapping between dmabuf and GEM handle when releasing GEM handles. But that is not always true, since we would create extra handles for the GEM obj in cases like gem_open() and getfb{,2}(). A similar issue was reported at: https://lore.kernel.org/all/20211105083308.392156-1-jay.xu@rock-chips.com/ Another problem is that the imported dmabuf might not always have gem_obj->dma_buf set, which would cause leaks in drm_gem_remove_prime_handles(). Let's fix these for now by using handle to find the exact map to remove. Signed-off-by: Jeffy Chen <jeffy.chen(a)rock-chips.com> Reviewed-by: Christian König <christian.koenig(a)amd.com> Signed-off-by: Christian König <christian.koenig(a)amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220819072834.17888-1-jeffy.… Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- drivers/gpu/drm/drm_gem.c | 17 +---------------- drivers/gpu/drm/drm_internal.h | 4 ++-- drivers/gpu/drm/drm_prime.c | 20 ++++++++++++-------- 3 files changed, 15 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 6410563a9cb6f..dbd19a34b517b 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -167,21 +167,6 @@ void drm_gem_private_object_init(struct drm_device *dev, } EXPORT_SYMBOL(drm_gem_private_object_init); -static void -drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) -{ - /* - * Note: obj->dma_buf can't disappear as long as we still hold a - * handle reference in obj->handle_count. - */ - mutex_lock(&filp->prime.lock); - if (obj->dma_buf) { - drm_prime_remove_buf_handle_locked(&filp->prime, - obj->dma_buf); - } - mutex_unlock(&filp->prime.lock); -} - /** * drm_gem_object_handle_free - release resources bound to userspace handles * @obj: GEM object to clean up. @@ -252,7 +237,7 @@ drm_gem_object_release_handle(int id, void *ptr, void *data) if (obj->funcs->close) obj->funcs->close(obj, file_priv); - drm_gem_remove_prime_handles(obj, file_priv); + drm_prime_remove_buf_handle(&file_priv->prime, id); drm_vma_node_revoke(&obj->vma_node, file_priv); drm_gem_object_handle_put_unlocked(obj); diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index 17f3548c8ed25..d05e6a5b66873 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -74,8 +74,8 @@ int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv); void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv); -void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, - struct dma_buf *dma_buf); +void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, + uint32_t handle); /* drm_drv.c */ struct drm_minor *drm_minor_acquire(unsigned int minor_id); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index d6c7f4f9a7a29..a350310b65d89 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -187,29 +187,33 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri return -ENOENT; } -void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, - struct dma_buf *dma_buf) +void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, + uint32_t handle) { struct rb_node *rb; - rb = prime_fpriv->dmabufs.rb_node; + mutex_lock(&prime_fpriv->lock); + + rb = prime_fpriv->handles.rb_node; while (rb) { struct drm_prime_member *member; - member = rb_entry(rb, struct drm_prime_member, dmabuf_rb); - if (member->dma_buf == dma_buf) { + member = rb_entry(rb, struct drm_prime_member, handle_rb); + if (member->handle == handle) { rb_erase(&member->handle_rb, &prime_fpriv->handles); rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs); - dma_buf_put(dma_buf); + dma_buf_put(member->dma_buf); kfree(member); - return; - } else if (member->dma_buf < dma_buf) { + break; + } else if (member->handle < handle) { rb = rb->rb_right; } else { rb = rb->rb_left; } } + + mutex_unlock(&prime_fpriv->lock); } void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) -- 2.35.1

2 years, 3 months

[PATCH AUTOSEL 5.19 07/33] drm/gem: Fix GEM handle release errors

by Sasha Levin

From: Jeffy Chen <jeffy.chen(a)rock-chips.com> [ Upstream commit ea2aa97ca37a9044ade001aef71dbc06318e8d44 ] Currently we are assuming a one to one mapping between dmabuf and GEM handle when releasing GEM handles. But that is not always true, since we would create extra handles for the GEM obj in cases like gem_open() and getfb{,2}(). A similar issue was reported at: https://lore.kernel.org/all/20211105083308.392156-1-jay.xu@rock-chips.com/ Another problem is that the imported dmabuf might not always have gem_obj->dma_buf set, which would cause leaks in drm_gem_remove_prime_handles(). Let's fix these for now by using handle to find the exact map to remove. Signed-off-by: Jeffy Chen <jeffy.chen(a)rock-chips.com> Reviewed-by: Christian König <christian.koenig(a)amd.com> Signed-off-by: Christian König <christian.koenig(a)amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220819072834.17888-1-jeffy.… Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- drivers/gpu/drm/drm_gem.c | 17 +---------------- drivers/gpu/drm/drm_internal.h | 4 ++-- drivers/gpu/drm/drm_prime.c | 20 ++++++++++++-------- 3 files changed, 15 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 86d670c712867..ad068865ba206 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -168,21 +168,6 @@ void drm_gem_private_object_init(struct drm_device *dev, } EXPORT_SYMBOL(drm_gem_private_object_init); -static void -drm_gem_remove_prime_handles(struct drm_gem_object *obj, struct drm_file *filp) -{ - /* - * Note: obj->dma_buf can't disappear as long as we still hold a - * handle reference in obj->handle_count. - */ - mutex_lock(&filp->prime.lock); - if (obj->dma_buf) { - drm_prime_remove_buf_handle_locked(&filp->prime, - obj->dma_buf); - } - mutex_unlock(&filp->prime.lock); -} - /** * drm_gem_object_handle_free - release resources bound to userspace handles * @obj: GEM object to clean up. @@ -253,7 +238,7 @@ drm_gem_object_release_handle(int id, void *ptr, void *data) if (obj->funcs->close) obj->funcs->close(obj, file_priv); - drm_gem_remove_prime_handles(obj, file_priv); + drm_prime_remove_buf_handle(&file_priv->prime, id); drm_vma_node_revoke(&obj->vma_node, file_priv); drm_gem_object_handle_put_unlocked(obj); diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index 1fbbc19f1ac09..7bb98e6a446d0 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -74,8 +74,8 @@ int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data, void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv); void drm_prime_destroy_file_private(struct drm_prime_file_private *prime_fpriv); -void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, - struct dma_buf *dma_buf); +void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, + uint32_t handle); /* drm_drv.c */ struct drm_minor *drm_minor_acquire(unsigned int minor_id); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index e3f09f18110c7..bd5366b16381b 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -190,29 +190,33 @@ static int drm_prime_lookup_buf_handle(struct drm_prime_file_private *prime_fpri return -ENOENT; } -void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpriv, - struct dma_buf *dma_buf) +void drm_prime_remove_buf_handle(struct drm_prime_file_private *prime_fpriv, + uint32_t handle) { struct rb_node *rb; - rb = prime_fpriv->dmabufs.rb_node; + mutex_lock(&prime_fpriv->lock); + + rb = prime_fpriv->handles.rb_node; while (rb) { struct drm_prime_member *member; - member = rb_entry(rb, struct drm_prime_member, dmabuf_rb); - if (member->dma_buf == dma_buf) { + member = rb_entry(rb, struct drm_prime_member, handle_rb); + if (member->handle == handle) { rb_erase(&member->handle_rb, &prime_fpriv->handles); rb_erase(&member->dmabuf_rb, &prime_fpriv->dmabufs); - dma_buf_put(dma_buf); + dma_buf_put(member->dma_buf); kfree(member); - return; - } else if (member->dma_buf < dma_buf) { + break; + } else if (member->handle < handle) { rb = rb->rb_right; } else { rb = rb->rb_left; } } + + mutex_unlock(&prime_fpriv->lock); } void drm_prime_init_file_private(struct drm_prime_file_private *prime_fpriv) -- 2.35.1

2 years, 3 months

[PATCH 0/4] Allow MMIO regions to be exported through dma-buf

by Jason Gunthorpe

dma-buf has become a way to safely acquire a handle to non-struct page memory that can still have lifetime controlled by the exporter. Notably RDMA can now import dma-buf FDs and build them into MRs which allows for PCI P2P operations. Extend this to allow vfio-pci to export MMIO memory from PCI device BARs. This series supports a use case for SPDK where a NVMe device will be owned by SPDK through VFIO but interacting with a RDMA device. The RDMA device may directly access the NVMe CMB or directly manipulate the NVMe device's doorbell using PCI P2P. However, as a general mechanism, it can support many other scenarios with VFIO. I imagine this dmabuf approach to be usable by iommufd as well for generic and safe P2P mappings. This series goes after the "Break up ioctl dispatch functions to one function per ioctl" series. This is on github: https://github.com/jgunthorpe/linux/commits/vfio_dma_buf Jason Gunthorpe (4): dma-buf: Add dma_buf_try_get() vfio: Add vfio_device_get() vfio_pci: Do not open code pci_try_reset_function() vfio/pci: Allow MMIO regions to be exported through dma-buf drivers/vfio/pci/Makefile | 1 + drivers/vfio/pci/vfio_pci_config.c | 22 ++- drivers/vfio/pci/vfio_pci_core.c | 33 +++- drivers/vfio/pci/vfio_pci_dma_buf.c | 265 ++++++++++++++++++++++++++++ drivers/vfio/pci/vfio_pci_priv.h | 24 +++ drivers/vfio/vfio_main.c | 3 +- include/linux/dma-buf.h | 13 ++ include/linux/vfio.h | 6 + include/linux/vfio_pci_core.h | 1 + include/uapi/linux/vfio.h | 18 ++ 10 files changed, 364 insertions(+), 22 deletions(-) create mode 100644 drivers/vfio/pci/vfio_pci_dma_buf.c base-commit: 385f0411fcd2780b5273992832cdc8edcd5b8ea9 -- 2.37.2

2 years, 3 months

[PATCH v3] drm/ast: add dmabuf/prime buffer sharing support

by oushixiong

This patch adds ast specific codes for DRM prime feature, this is to allow for offloading of rending in one direction and outputs in other. This patch is designed to solve the problem that the AST is not displayed when the server plug in a discrete graphics card at the same time. We call the dirty callback function to copy the rendering results of the discrete graphics card to the ast side by dma-buf. v1->v2: - Fix the comment. v2->v3: - we remove the gem_prime_import_sg_table callback and use the gem_prime_import callback, because it just map and access the buffer with the CPU. and do not to pin the buffer. Signed-off-by: oushixiong <oushixiong(a)kylinos.cn> Reported-by: kernel test robot <lkp(a)intel.com> --- drivers/gpu/drm/ast/ast_drv.c | 27 +++++++ drivers/gpu/drm/ast/ast_mode.c | 125 ++++++++++++++++++++++++++++++++- 2 files changed, 151 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c index 7465c4f0156a..fd3c4bad2eb4 100644 --- a/drivers/gpu/drm/ast/ast_drv.c +++ b/drivers/gpu/drm/ast/ast_drv.c @@ -28,6 +28,7 @@ #include <linux/module.h> #include <linux/pci.h> +#include <linux/dma-buf.h> #include <drm/drm_aperture.h> #include <drm/drm_atomic_helper.h> @@ -50,6 +51,29 @@ module_param_named(modeset, ast_modeset, int, 0400); DEFINE_DRM_GEM_FOPS(ast_fops); +static struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + struct drm_gem_vram_object *gbo; + + gbo = drm_gem_vram_of_gem(dma_buf->priv); + if (gbo->bo.base.dev == dev) { + /* + * Importing dmabuf exported from out own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ + drm_gem_object_get(&gbo->bo.base); + return &gbo->bo.base; + } + + gbo = drm_gem_vram_create(dev, dma_buf->size, 0); + if (IS_ERR(gbo)) + return NULL; + + get_dma_buf(dma_buf); + return &gbo->bo.base; +} + static const struct drm_driver ast_driver = { .driver_features = DRIVER_ATOMIC | DRIVER_GEM | @@ -63,6 +87,9 @@ static const struct drm_driver ast_driver = { .minor = DRIVER_MINOR, .patchlevel = DRIVER_PATCHLEVEL, + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, + .gem_prime_import = ast_gem_prime_import, + DRM_GEM_VRAM_DRIVER }; diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index 45b56b39ad47..65a4342c5622 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -48,6 +48,8 @@ #include "ast_drv.h" #include "ast_tables.h" +MODULE_IMPORT_NS(DMA_BUF); + static inline void ast_load_palette_index(struct ast_private *ast, u8 index, u8 red, u8 green, u8 blue) @@ -1535,8 +1537,129 @@ static const struct drm_mode_config_helper_funcs ast_mode_config_helper_funcs = .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, }; +static int ast_handle_damage(struct drm_framebuffer *fb, int x, int y, + int width, int height) +{ + struct drm_gem_vram_object *dst_bo = NULL; + void *dst = NULL; + int ret = 0, i; + unsigned long offset = 0; + bool unmap = false; + unsigned int bytesPerPixel; + struct iosys_map map; + struct iosys_map dmabuf_map; + + bytesPerPixel = fb->format->cpp[0]; + + if (!fb->obj[0]->dma_buf) + return -EINVAL; + + if (!fb->obj[0]->dma_buf->vmap_ptr.vaddr) { + ret = dma_buf_vmap(fb->obj[0]->dma_buf, &dmabuf_map); + if (ret) + return ret; + } else + dmabuf_map.vaddr = fb->obj[0]->dma_buf->vmap_ptr.vaddr; + + dst_bo = drm_gem_vram_of_gem(fb->obj[0]); + + ret = drm_gem_vram_pin(dst_bo, 0); + if (ret) { + DRM_ERROR("ast_bo_pin failed\n"); + return ret; + } + + if (!dst_bo->map.vaddr) { + ret = drm_gem_vram_vmap(dst_bo, &map); + if (ret) { + drm_gem_vram_unpin(dst_bo); + DRM_ERROR("failed to vmap fbcon\n"); + return ret; + } + unmap = true; + } + dst = dst_bo->map.vaddr; + + for (i = y; i < y + height; i++) { + offset = i * fb->pitches[0] + (x * bytesPerPixel); + memcpy_toio(dst + offset, dmabuf_map.vaddr + offset, + width * bytesPerPixel); + } + + if (unmap) + drm_gem_vram_vunmap(dst_bo, &map); + + drm_gem_vram_unpin(dst_bo); + + return 0; +} + + +static int ast_user_framebuffer_dirty(struct drm_framebuffer *fb, + struct drm_file *file, + unsigned int flags, + unsigned int color, + struct drm_clip_rect *clips, + unsigned int num_clips) +{ + int i, ret = 0; + + drm_modeset_lock_all(fb->dev); + if (fb->obj[0]->dma_buf) { + ret = dma_buf_begin_cpu_access(fb->obj[0]->dma_buf, + DMA_FROM_DEVICE); + if (ret) + goto unlock; + } + + for (i = 0; i < num_clips; i++) { + ret = ast_handle_damage(fb, clips[i].x1, clips[i].y1, + clips[i].x2 - clips[i].x1, clips[i].y2 - clips[i].y1); + if (ret) + break; + } + + if (fb->obj[0]->dma_buf) { + dma_buf_end_cpu_access(fb->obj[0]->dma_buf, + DMA_FROM_DEVICE); + } + +unlock: + drm_modeset_unlock_all(fb->dev); + + return ret; +} + +static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb) +{ + struct iosys_map dmabuf_map; + + if (fb->obj[0]->dma_buf) { + dmabuf_map.is_iomem = fb->obj[0]->dma_buf->vmap_ptr.is_iomem; + dmabuf_map.vaddr = fb->obj[0]->dma_buf->vmap_ptr.vaddr; + if (dmabuf_map.vaddr) + dma_buf_vunmap(fb->obj[0]->dma_buf, &dmabuf_map); + } + + drm_gem_fb_destroy(fb); +} + +static const struct drm_framebuffer_funcs ast_gem_fb_funcs_dirtyfb = { + .destroy = ast_user_framebuffer_destroy, + .create_handle = drm_gem_fb_create_handle, + .dirty = ast_user_framebuffer_dirty, +}; + +static struct drm_framebuffer * +ast_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file, + const struct drm_mode_fb_cmd2 *mode_cmd) +{ + return drm_gem_fb_create_with_funcs(dev, file, mode_cmd, + &ast_gem_fb_funcs_dirtyfb); +} + static const struct drm_mode_config_funcs ast_mode_config_funcs = { - .fb_create = drm_gem_fb_create, + .fb_create = ast_gem_fb_create_with_dirty, .mode_valid = drm_vram_helper_mode_valid, .atomic_check = drm_atomic_helper_check, .atomic_commit = drm_atomic_helper_commit, -- 2.17.1 No virus found Checked by Hillstone Network AntiVirus

2 years, 3 months

Re: [PTACH v3] drm/ast: add dmabuf/prime buffer sharing support

by Christian König

Am 27.08.22 um 11:10 schrieb oushixiong: > This patch adds ast specific codes for DRM prime feature, this is to > allow for offloading of rending in one direction and outputs in other. > > This patch is designed to solve the problem that the AST is not displayed > when the server plug in a discrete graphics graphics card at the same time. > We call the dirty callback function to copy the rendering results of the > discrete graphics card to the ast side by dma-buf. > > v1->v2: > - Fix the comment. > v2->v3: > - we remove the gem_prime_import_sg_table callback and use the gem_prime_import > callback, becuase it just map and access the buffer with the CPU. and do not > to pin the buffer. > > Signed-off-by: oushixiong <oushixiong(a)kylinos.cn> Thomas should probably comment as well, I think at least the memcpy_toio usage can still be made cleaner. But from the DMA-buf side I think that looks good now, feel free to add an Acked-by: Christian König <christian.koenig(a)amd.com> Regards, Christian. > --- > drivers/gpu/drm/ast/ast_drv.c | 27 +++++++ > drivers/gpu/drm/ast/ast_mode.c | 125 ++++++++++++++++++++++++++++++++- > 2 files changed, 151 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c > index 7465c4f0156a..107383a56ca7 100644 > --- a/drivers/gpu/drm/ast/ast_drv.c > +++ b/drivers/gpu/drm/ast/ast_drv.c > @@ -28,6 +28,7 @@ > > #include <linux/module.h> > #include <linux/pci.h> > +#include <linux/dma-buf.h> > > #include <drm/drm_aperture.h> > #include <drm/drm_atomic_helper.h> > @@ -50,6 +51,29 @@ module_param_named(modeset, ast_modeset, int, 0400); > > DEFINE_DRM_GEM_FOPS(ast_fops); > > +struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev, > + struct dma_buf *dma_buf) > +{ > + struct drm_gem_vram_object *gbo; > + > + gbo = drm_gem_vram_of_gem(dma_buf->priv); > + if (gbo->bo.base.dev == dev) { > + /* > + * Importing dmabuf exported from out own gem increases > + * refcount on gem itself instead of f_count of dmabuf. > + */ > + drm_gem_object_get(&gbo->bo.base); > + return &gbo->bo.base; > + } > + > + gbo = drm_gem_vram_create(dev, dma_buf->size, 0); > + if (IS_ERR(gbo)) > + return NULL; > + > + get_dma_buf(dma_buf); > + return &gbo->bo.base; > +} > + > static const struct drm_driver ast_driver = { > .driver_features = DRIVER_ATOMIC | > DRIVER_GEM | > @@ -63,6 +87,9 @@ static const struct drm_driver ast_driver = { > .minor = DRIVER_MINOR, > .patchlevel = DRIVER_PATCHLEVEL, > > + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, > + .gem_prime_import = ast_gem_prime_import, > + > DRM_GEM_VRAM_DRIVER > }; > > diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c > index 45b56b39ad47..65a4342c5622 100644 > --- a/drivers/gpu/drm/ast/ast_mode.c > +++ b/drivers/gpu/drm/ast/ast_mode.c > @@ -48,6 +48,8 @@ > #include "ast_drv.h" > #include "ast_tables.h" > > +MODULE_IMPORT_NS(DMA_BUF); > + > static inline void ast_load_palette_index(struct ast_private *ast, > u8 index, u8 red, u8 green, > u8 blue) > @@ -1535,8 +1537,129 @@ static const struct drm_mode_config_helper_funcs ast_mode_config_helper_funcs = > .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, > }; > > +static int ast_handle_damage(struct drm_framebuffer *fb, int x, int y, > + int width, int height) > +{ > + struct drm_gem_vram_object *dst_bo = NULL; > + void *dst = NULL; > + int ret = 0, i; > + unsigned long offset = 0; > + bool unmap = false; > + unsigned int bytesPerPixel; > + struct iosys_map map; > + struct iosys_map dmabuf_map; > + > + bytesPerPixel = fb->format->cpp[0]; > + > + if (!fb->obj[0]->dma_buf) > + return -EINVAL; > + > + if (!fb->obj[0]->dma_buf->vmap_ptr.vaddr) { > + ret = dma_buf_vmap(fb->obj[0]->dma_buf, &dmabuf_map); > + if (ret) > + return ret; > + } else > + dmabuf_map.vaddr = fb->obj[0]->dma_buf->vmap_ptr.vaddr; > + > + dst_bo = drm_gem_vram_of_gem(fb->obj[0]); > + > + ret = drm_gem_vram_pin(dst_bo, 0); > + if (ret) { > + DRM_ERROR("ast_bo_pin failed\n"); > + return ret; > + } > + > + if (!dst_bo->map.vaddr) { > + ret = drm_gem_vram_vmap(dst_bo, &map); > + if (ret) { > + drm_gem_vram_unpin(dst_bo); > + DRM_ERROR("failed to vmap fbcon\n"); > + return ret; > + } > + unmap = true; > + } > + dst = dst_bo->map.vaddr; > + > + for (i = y; i < y + height; i++) { > + offset = i * fb->pitches[0] + (x * bytesPerPixel); > + memcpy_toio(dst + offset, dmabuf_map.vaddr + offset, > + width * bytesPerPixel); > + } > + > + if (unmap) > + drm_gem_vram_vunmap(dst_bo, &map); > + > + drm_gem_vram_unpin(dst_bo); > + > + return 0; > +} > + > + > +static int ast_user_framebuffer_dirty(struct drm_framebuffer *fb, > + struct drm_file *file, > + unsigned int flags, > + unsigned int color, > + struct drm_clip_rect *clips, > + unsigned int num_clips) > +{ > + int i, ret = 0; > + > + drm_modeset_lock_all(fb->dev); > + if (fb->obj[0]->dma_buf) { > + ret = dma_buf_begin_cpu_access(fb->obj[0]->dma_buf, > + DMA_FROM_DEVICE); > + if (ret) > + goto unlock; > + } > + > + for (i = 0; i < num_clips; i++) { > + ret = ast_handle_damage(fb, clips[i].x1, clips[i].y1, > + clips[i].x2 - clips[i].x1, clips[i].y2 - clips[i].y1); > + if (ret) > + break; > + } > + > + if (fb->obj[0]->dma_buf) { > + dma_buf_end_cpu_access(fb->obj[0]->dma_buf, > + DMA_FROM_DEVICE); > + } > + > +unlock: > + drm_modeset_unlock_all(fb->dev); > + > + return ret; > +} > + > +static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb) > +{ > + struct iosys_map dmabuf_map; > + > + if (fb->obj[0]->dma_buf) { > + dmabuf_map.is_iomem = fb->obj[0]->dma_buf->vmap_ptr.is_iomem; > + dmabuf_map.vaddr = fb->obj[0]->dma_buf->vmap_ptr.vaddr; > + if (dmabuf_map.vaddr) > + dma_buf_vunmap(fb->obj[0]->dma_buf, &dmabuf_map); > + } > + > + drm_gem_fb_destroy(fb); > +} > + > +static const struct drm_framebuffer_funcs ast_gem_fb_funcs_dirtyfb = { > + .destroy = ast_user_framebuffer_destroy, > + .create_handle = drm_gem_fb_create_handle, > + .dirty = ast_user_framebuffer_dirty, > +}; > + > +static struct drm_framebuffer * > +ast_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file, > + const struct drm_mode_fb_cmd2 *mode_cmd) > +{ > + return drm_gem_fb_create_with_funcs(dev, file, mode_cmd, > + &ast_gem_fb_funcs_dirtyfb); > +} > + > static const struct drm_mode_config_funcs ast_mode_config_funcs = { > - .fb_create = drm_gem_fb_create, > + .fb_create = ast_gem_fb_create_with_dirty, > .mode_valid = drm_vram_helper_mode_valid, > .atomic_check = drm_atomic_helper_check, > .atomic_commit = drm_atomic_helper_commit,

2 years, 3 months

Re: [PTACH v3] drm/ast: add dmabuf/prime buffer sharing support

by kernel test robot

Hi oushixiong, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-misc/drm-misc-next] [also build test WARNING on drm/drm-next drm-intel/for-linux-next drm-tip/drm-tip linus/master v6.0-rc3 next-20220826] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/oushixiong/drm-ast-add-dmabu… base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220829/202208291132.RQqpjzO1-lkp@…) compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/intel-lab-lkp/linux/commit/da31884b8b7e33af5cd8aa750dea3… git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review oushixiong/drm-ast-add-dmabuf-prime-buffer-sharing-support/20220829-084713 git checkout da31884b8b7e33af5cd8aa750dea30fde59d52aa # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/ast/ If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp(a)intel.com> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/ast/ast_drv.c:54:24: warning: no previous prototype for function 'ast_gem_prime_import' [-Wmissing-prototypes] struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev, ^ drivers/gpu/drm/ast/ast_drv.c:54:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev, ^ static 1 warning generated. vim +/ast_gem_prime_import +54 drivers/gpu/drm/ast/ast_drv.c 53 > 54 struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev, 55 struct dma_buf *dma_buf) 56 { 57 struct drm_gem_vram_object *gbo; 58 59 gbo = drm_gem_vram_of_gem(dma_buf->priv); 60 if (gbo->bo.base.dev == dev) { 61 /* 62 * Importing dmabuf exported from out own gem increases 63 * refcount on gem itself instead of f_count of dmabuf. 64 */ 65 drm_gem_object_get(&gbo->bo.base); 66 return &gbo->bo.base; 67 } 68 69 gbo = drm_gem_vram_create(dev, dma_buf->size, 0); 70 if (IS_ERR(gbo)) 71 return NULL; 72 73 get_dma_buf(dma_buf); 74 return &gbo->bo.base; 75 } 76 -- 0-DAY CI Kernel Test Service https://01.org/lkp

2 years, 3 months

[PATCH] drm/ast: add dmabuf/prime buffer sharing support

by oushixiong

This patch adds ast specific codes for DRM prime feature, this is to allow for offloading of rending in one direction and outputs in other. This patch is designed to solve the problem that the AST is not displayed when the server plug in a discrete graphics graphics card at the same time. We call the dirty callback function to copy the rendering results of the discrete graphics card to the ast side by dma-buf. v1->v2: - Fix the comment. v2->v3: - we remove the attach function, add the drm_gem_pin() before dma_buf_vmap(), and add the drm_gem_unpin() after the dma_buf_vunmap(). Signed-off-by: oushixiong <oushixiong(a)kylinos.cn> --- drivers/gpu/drm/ast/ast_drv.c | 27 +++++++ drivers/gpu/drm/ast/ast_mode.c | 134 ++++++++++++++++++++++++++++++++- drivers/gpu/drm/drm_gem.c | 2 + include/drm/drm_gem.h | 3 + 4 files changed, 165 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c index 7465c4f0156a..107383a56ca7 100644 --- a/drivers/gpu/drm/ast/ast_drv.c +++ b/drivers/gpu/drm/ast/ast_drv.c @@ -28,6 +28,7 @@ #include <linux/module.h> #include <linux/pci.h> +#include <linux/dma-buf.h> #include <drm/drm_aperture.h> #include <drm/drm_atomic_helper.h> @@ -50,6 +51,29 @@ module_param_named(modeset, ast_modeset, int, 0400); DEFINE_DRM_GEM_FOPS(ast_fops); +struct drm_gem_object *ast_gem_prime_import(struct drm_device *dev, + struct dma_buf *dma_buf) +{ + struct drm_gem_vram_object *gbo; + + gbo = drm_gem_vram_of_gem(dma_buf->priv); + if (gbo->bo.base.dev == dev) { + /* + * Importing dmabuf exported from out own gem increases + * refcount on gem itself instead of f_count of dmabuf. + */ + drm_gem_object_get(&gbo->bo.base); + return &gbo->bo.base; + } + + gbo = drm_gem_vram_create(dev, dma_buf->size, 0); + if (IS_ERR(gbo)) + return NULL; + + get_dma_buf(dma_buf); + return &gbo->bo.base; +} + static const struct drm_driver ast_driver = { .driver_features = DRIVER_ATOMIC | DRIVER_GEM | @@ -63,6 +87,9 @@ static const struct drm_driver ast_driver = { .minor = DRIVER_MINOR, .patchlevel = DRIVER_PATCHLEVEL, + .prime_fd_to_handle = drm_gem_prime_fd_to_handle, + .gem_prime_import = ast_gem_prime_import, + DRM_GEM_VRAM_DRIVER }; diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c index 45b56b39ad47..c81a6148b6df 100644 --- a/drivers/gpu/drm/ast/ast_mode.c +++ b/drivers/gpu/drm/ast/ast_mode.c @@ -48,6 +48,8 @@ #include "ast_drv.h" #include "ast_tables.h" +MODULE_IMPORT_NS(DMA_BUF); + static inline void ast_load_palette_index(struct ast_private *ast, u8 index, u8 red, u8 green, u8 blue) @@ -1535,8 +1537,138 @@ static const struct drm_mode_config_helper_funcs ast_mode_config_helper_funcs = .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, }; +static int ast_handle_damage(struct drm_framebuffer *fb, int x, int y, + int width, int height) +{ + struct drm_gem_vram_object *dst_bo = NULL; + void *dst = NULL; + int ret = 0, i; + unsigned long offset = 0; + bool unmap = false; + unsigned int bytesPerPixel; + struct iosys_map map; + struct iosys_map dmabuf_map; + + bytesPerPixel = fb->format->cpp[0]; + + if (!fb->obj[0]->dma_buf) + return -EINVAL; + + if (!fb->obj[0]->dma_buf->vmap_ptr.vaddr) { + ret = drm_gem_pin(fb->obj[0]->dma_buf->priv); + if (ret) + return ret; + ret = dma_buf_vmap(fb->obj[0]->dma_buf, &dmabuf_map); + if (ret) + goto err_vmap_dmabuf; + } else + dmabuf_map.vaddr = fb->obj[0]->dma_buf->vmap_ptr.vaddr; + + dst_bo = drm_gem_vram_of_gem(fb->obj[0]); + + ret = drm_gem_vram_pin(dst_bo, 0); + if (ret) { + DRM_ERROR("ast_bo_pin failed\n"); + goto err_ast_pin; + } + + if (!dst_bo->map.vaddr) { + ret = drm_gem_vram_vmap(dst_bo, &map); + if (ret) { + DRM_ERROR("failed to vmap fbcon\n"); + goto err_vmap_ast_bo; + } + unmap = true; + } + dst = dst_bo->map.vaddr; + + for (i = y; i < y + height; i++) { + offset = i * fb->pitches[0] + (x * bytesPerPixel); + memcpy_toio(dst + offset, dmabuf_map.vaddr + offset, + width * bytesPerPixel); + } + + if (unmap) + drm_gem_vram_vunmap(dst_bo, &map); + + drm_gem_vram_unpin(dst_bo); + return 0; + +err_vmap_ast_bo: + drm_gem_vram_unpin(dst_bo); +err_ast_pin: +err_vmap_dmabuf: + drm_gem_unpin(fb->obj[0]->dma_buf->priv); + return ret; +} + + +static int ast_user_framebuffer_dirty(struct drm_framebuffer *fb, + struct drm_file *file, + unsigned int flags, + unsigned int color, + struct drm_clip_rect *clips, + unsigned int num_clips) +{ + int i, ret = 0; + + drm_modeset_lock_all(fb->dev); + if (fb->obj[0]->dma_buf) { + ret = dma_buf_begin_cpu_access(fb->obj[0]->dma_buf, + DMA_FROM_DEVICE); + if (ret) + goto unlock; + } + + for (i = 0; i < num_clips; i++) { + ret = ast_handle_damage(fb, clips[i].x1, clips[i].y1, + clips[i].x2 - clips[i].x1, clips[i].y2 - clips[i].y1); + if (ret) + break; + } + + if (fb->obj[0]->dma_buf) { + dma_buf_end_cpu_access(fb->obj[0]->dma_buf, + DMA_FROM_DEVICE); + } + +unlock: + drm_modeset_unlock_all(fb->dev); + + return ret; +} + +static void ast_user_framebuffer_destroy(struct drm_framebuffer *fb) +{ + struct iosys_map dmabuf_map; + + if (fb->obj[0]->dma_buf) { + dmabuf_map.is_iomem = fb->obj[0]->dma_buf->vmap_ptr.is_iomem; + dmabuf_map.vaddr = fb->obj[0]->dma_buf->vmap_ptr.vaddr; + if (dmabuf_map.vaddr) + dma_buf_vunmap(fb->obj[0]->dma_buf, &dmabuf_map); + drm_gem_unpin(fb->obj[0]->dma_buf->priv); + } + + drm_gem_fb_destroy(fb); +} + +static const struct drm_framebuffer_funcs ast_gem_fb_funcs_dirtyfb = { + .destroy = ast_user_framebuffer_destroy, + .create_handle = drm_gem_fb_create_handle, + .dirty = ast_user_framebuffer_dirty, +}; + +static struct drm_framebuffer * +ast_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file, + const struct drm_mode_fb_cmd2 *mode_cmd) +{ + return drm_gem_fb_create_with_funcs(dev, file, mode_cmd, + &ast_gem_fb_funcs_dirtyfb); +} + static const struct drm_mode_config_funcs ast_mode_config_funcs = { - .fb_create = drm_gem_fb_create, + .fb_create = ast_gem_fb_create_with_dirty, .mode_valid = drm_vram_helper_mode_valid, .atomic_check = drm_atomic_helper_check, .atomic_commit = drm_atomic_helper_commit, diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 56fb87885146..3a4f5137abc5 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -1159,12 +1159,14 @@ int drm_gem_pin(struct drm_gem_object *obj) else return 0; } +EXPORT_SYMBOL(drm_gem_pin); void drm_gem_unpin(struct drm_gem_object *obj) { if (obj->funcs->unpin) obj->funcs->unpin(obj); } +EXPORT_SYMBOL(drm_gem_unpin); int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map) { diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index e2941cee14b6..30c4366968bf 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -352,6 +352,9 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, struct vm_area_struct *vma); int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); +int drm_gem_pin(struct drm_gem_object *obj); +void drm_gem_unpin(struct drm_gem_object *obj); + /** * drm_gem_object_get - acquire a GEM buffer object reference * @obj: GEM buffer object -- 2.17.1 No virus found Checked by Hillstone Network AntiVirus

2 years, 3 months

[PATCH] dma-buf/dma-resv: check if the new fence is really later

by Christian König

Previously when we added a fence to a dma_resv object we always assumed the the newer than all the existing fences. With Jason's work to add an UAPI to explicit export/import that's not necessary the case any more. So without this check we would allow userspace to force the kernel into an use after free error. Since the change is very small and defensive it's probably a good idea to backport this to stable kernels as well just in case others are using the dma_resv object in the same way. Signed-off-by: Christian König <christian.koenig(a)amd.com> --- drivers/dma-buf/dma-resv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 205acb2c744d..e3885c90a3ac 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -295,7 +295,8 @@ void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence, enum dma_resv_usage old_usage; dma_resv_list_entry(fobj, i, obj, &old, &old_usage); - if ((old->context == fence->context && old_usage >= usage) || + if ((old->context == fence->context && old_usage >= usage && + dma_fence_is_later(fence, old)) || dma_fence_is_signaled(old)) { dma_resv_list_set(fobj, i, fence, usage); dma_fence_put(old); -- 2.25.1

2 years, 4 months

Re: [EXT] Re: [PATCH 1/3] dma-buf: heaps: add Linaro secure dmabuf heap support

by cyrille.fleury＠nxp.com

The content of this message was lost. It was probably cross-posted to multiple lists and previously handled on another list.

2 years, 4 months

[PATCH v2] dma-buf: cma_heap: Check for device max segment size when attaching

by Andrew Davis

Although there is usually not such a limitation (and when there is it is often only because the driver forgot to change the super small default), it is still correct here to break scatterlist element into chunks of dma_max_mapping_size(). This might cause some issues for users with misbehaving drivers. If bisecting has landed you on this commit, make sure your drivers both set dma_set_max_seg_size() and are checking for contiguousness correctly. Signed-off-by: Andrew Davis <afd(a)ti.com> --- Changes from v1: - Fixed mixed declarations and code warning drivers/dma-buf/heaps/cma_heap.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c index 28fb04eccdd0..a927b248c045 100644 --- a/drivers/dma-buf/heaps/cma_heap.c +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -52,16 +52,18 @@ static int cma_heap_attach(struct dma_buf *dmabuf, { struct cma_heap_buffer *buffer = dmabuf->priv; struct dma_heap_attachment *a; + size_t max_segment; int ret; a = kzalloc(sizeof(*a), GFP_KERNEL); if (!a) return -ENOMEM; - ret = sg_alloc_table_from_pages(&a->table, buffer->pages, - buffer->pagecount, 0, - buffer->pagecount << PAGE_SHIFT, - GFP_KERNEL); + max_segment = dma_get_max_seg_size(attachment->dev); + ret = sg_alloc_table_from_pages_segment(&a->table, buffer->pages, + buffer->pagecount, 0, + buffer->pagecount << PAGE_SHIFT, + max_segment, GFP_KERNEL); if (ret) { kfree(a); return ret; -- 2.36.1

2 years, 4 months

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