Linaro-mm-sig

linaro-mm-sig@lists.linaro.org

7 participants
2914 discussions

by Robert Morell

EXPORT_SYMBOL_GPL is intended to be used for "an internal implementation issue, and not really an interface". The dma-buf infrastructure is explicitly intended as an interface between modules/drivers, so it should use EXPORT_SYMBOL instead. Signed-off-by: Robert Morell <rmorell(a)nvidia.com> --- This patch is based on Linus's master branch. We held a discussion at ELC, and agreed that EXPORT_SYMBOL is more appropriate for this interface than EXPORT_SYMBOL_GPL. drivers/base/dma-buf.c | 34 +++++++++++++++++----------------- 1 files changed, 17 insertions(+), 17 deletions(-) diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c index 460e22d..24c28be 100644 --- a/drivers/base/dma-buf.c +++ b/drivers/base/dma-buf.c @@ -122,7 +122,7 @@ struct dma_buf *dma_buf_export(void *priv, const struct dma_buf_ops *ops, return dmabuf; } -EXPORT_SYMBOL_GPL(dma_buf_export); +EXPORT_SYMBOL(dma_buf_export); /** @@ -148,7 +148,7 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags) return fd; } -EXPORT_SYMBOL_GPL(dma_buf_fd); +EXPORT_SYMBOL(dma_buf_fd); /** * dma_buf_get - returns the dma_buf structure related to an fd @@ -174,7 +174,7 @@ struct dma_buf *dma_buf_get(int fd) return file->private_data; } -EXPORT_SYMBOL_GPL(dma_buf_get); +EXPORT_SYMBOL(dma_buf_get); /** * dma_buf_put - decreases refcount of the buffer @@ -189,7 +189,7 @@ void dma_buf_put(struct dma_buf *dmabuf) fput(dmabuf->file); } -EXPORT_SYMBOL_GPL(dma_buf_put); +EXPORT_SYMBOL(dma_buf_put); /** * dma_buf_attach - Add the device to dma_buf's attachments list; optionally, @@ -234,7 +234,7 @@ err_attach: mutex_unlock(&dmabuf->lock); return ERR_PTR(ret); } -EXPORT_SYMBOL_GPL(dma_buf_attach); +EXPORT_SYMBOL(dma_buf_attach); /** * dma_buf_detach - Remove the given attachment from dmabuf's attachments list; @@ -256,7 +256,7 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) mutex_unlock(&dmabuf->lock); kfree(attach); } -EXPORT_SYMBOL_GPL(dma_buf_detach); +EXPORT_SYMBOL(dma_buf_detach); /** * dma_buf_map_attachment - Returns the scatterlist table of the attachment; @@ -283,7 +283,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, return sg_table; } -EXPORT_SYMBOL_GPL(dma_buf_map_attachment); +EXPORT_SYMBOL(dma_buf_map_attachment); /** * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might @@ -304,7 +304,7 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction); } -EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); +EXPORT_SYMBOL(dma_buf_unmap_attachment); /** @@ -332,7 +332,7 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, return ret; } -EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); +EXPORT_SYMBOL(dma_buf_begin_cpu_access); /** * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the @@ -354,7 +354,7 @@ void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, if (dmabuf->ops->end_cpu_access) dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); } -EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); +EXPORT_SYMBOL(dma_buf_end_cpu_access); /** * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address @@ -371,7 +371,7 @@ void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) return dmabuf->ops->kmap_atomic(dmabuf, page_num); } -EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); +EXPORT_SYMBOL(dma_buf_kmap_atomic); /** * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. @@ -389,7 +389,7 @@ void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, if (dmabuf->ops->kunmap_atomic) dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); } -EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); +EXPORT_SYMBOL(dma_buf_kunmap_atomic); /** * dma_buf_kmap - Map a page of the buffer object into kernel address space. The @@ -406,7 +406,7 @@ void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) return dmabuf->ops->kmap(dmabuf, page_num); } -EXPORT_SYMBOL_GPL(dma_buf_kmap); +EXPORT_SYMBOL(dma_buf_kmap); /** * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. @@ -424,7 +424,7 @@ void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, if (dmabuf->ops->kunmap) dmabuf->ops->kunmap(dmabuf, page_num, vaddr); } -EXPORT_SYMBOL_GPL(dma_buf_kunmap); +EXPORT_SYMBOL(dma_buf_kunmap); /** @@ -466,7 +466,7 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, return dmabuf->ops->mmap(dmabuf, vma); } -EXPORT_SYMBOL_GPL(dma_buf_mmap); +EXPORT_SYMBOL(dma_buf_mmap); /** * dma_buf_vmap - Create virtual mapping for the buffer object into kernel @@ -487,7 +487,7 @@ void *dma_buf_vmap(struct dma_buf *dmabuf) return dmabuf->ops->vmap(dmabuf); return NULL; } -EXPORT_SYMBOL_GPL(dma_buf_vmap); +EXPORT_SYMBOL(dma_buf_vmap); /** * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. @@ -502,4 +502,4 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) if (dmabuf->ops->vunmap) dmabuf->ops->vunmap(dmabuf, vaddr); } -EXPORT_SYMBOL_GPL(dma_buf_vunmap); +EXPORT_SYMBOL(dma_buf_vunmap); -- 1.7.8.6

12 years, 8 months

[GIT PULL] CMA and DMA-mapping fixes for v3.7-rc3

by Marek Szyprowski

Hi Linus, I would like to ask for pulling some minor fixes for both CMA (Contiguous Memory Allocator) and DMA-mapping framework for v3.7-rc3. ---------------------------------------------------------------- The following changes since commit 6f0c0580b70c89094b3422ba81118c7b959c7556: Linux 3.7-rc2 (2012-10-20 12:11:32 -0700) are available in the git repository at: git://git.linaro.org/people/mszyprowski/linux-dma-mapping.git fixes_for_linus for you to fetch changes up to 4e85fb831aa210fd1c5e2cb7909ac203c1f5b67f: ARM: mm: Remove unused arm_vmregion priv field (2012-10-24 07:38:15 +0200) ---------------------------------------------------------------- This pull request consists mainly of a set of one-liner fixes and cleanups for a few minor issues identified in both Contiguous Memory Allocator code and ARM DMA-mapping subsystem. Thanks! Best regards Marek Szyprowski Samsung Poland R&D Center ---------------------------------------------------------------- Patch summary: Bob Liu (1): mm: cma: alloc_contig_range: return early for err path Jingoo Han (1): ARM: dma-mapping: fix build warning in __dma_alloc() Laurent Pinchart (4): drivers: dma-contiguous: Don't redefine SZ_1M drivers: dma-coherent: Fix typo in dma_mmap_from_coherent documentation drivers: cma: Fix wrong CMA selected region size default value ARM: mm: Remove unused arm_vmregion priv field Ming Lei (1): ARM: dma-mapping: support debug_dma_mapping_error arch/arm/include/asm/dma-mapping.h | 1 + arch/arm/mm/dma-mapping.c | 2 +- arch/arm/mm/vmregion.h | 1 - drivers/base/Kconfig | 2 +- drivers/base/dma-coherent.c | 5 ++--- drivers/base/dma-contiguous.c | 5 +---- mm/page_alloc.c | 2 +- 7 files changed, 7 insertions(+), 11 deletions(-)

12 years, 8 months

Re: [Linaro-mm-sig] [PATCH] dma-buf: Use EXPORT_SYMBOL

by Ken Phillis Jr

I agree with the logic Airlied made about Robert's patch. This is an important interface where it's not something you want to force closed source vendors to recreate and have things be an incompatible mess. This would cause a disaster for end users in the long rung... As for Airlied's mentioning of finding out the author's intention. This requires a chain of events to find out what exactly is going on... With this said, I will go ahead and post a quick chain of events to figure out what is going on with this section of code so that this can get resolved as quickly as possible... So far, The only two that even suggested that this API be made EXPORT_SYMBOL_GPL is Konrad Wilk and Arnd Bergmann. That said, Of course Semwil will agree since the whole discussion of this occurred over a 5 day span, and then a delay of about 12 days before the final RFC submission was made. The initial Framework and build up of the dma-buf interface: ( August 10th 2011) * [Linaro-mm-sig] [RFC] dma-shared-buf: Add buffer sharing framework http://lists.linaro.org/pipermail/linaro-mm-sig/2011-August/000509.html * [Linaro-mm-sig] [RFC v2] dma-buf: Add buffer sharing framework http://lists.linaro.org/pipermail/linaro-mm-sig/2011-September/000616.html * [Linaro-mm-sig] [RFC v3] dma-buf: Add buffer sharing framework http://lists.linaro.org/pipermail/linaro-mm-sig/2011-September/000661.html * [Linaro-mm-sig] [RFC 1/2] dma-buf: Introduce dma buffer sharing mechanism http://lists.linaro.org/pipermail/linaro-mm-sig/2011-October/000692.html * [Linaro-mm-sig] [RFC v2 1/2] dma-buf: Introduce dma buffer sharing mechanism http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000810.html At this point it's December 2nd, and clearly it's been about 113 days since the initial interface suggestion. At this point is where the changes where suggested... Konrad - Makes initial suggestion ( was first response to this thread ) http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000812.html Arnd - Agrees with Konrad (same thread ) http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000815.html Semwil - Agrees with the other two ( same thread on December 7th) http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000830.html Then the final seal on this transaction appears on the RFC V3 for this version of the path that appeared December 19th... * [Linaro-mm-sig] [RFC v3 1/2] dma-buf: Introduce dma buffer sharing mechanism http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000880.html There's a closing statement that mentions this change ( However, there is no challenges made) * [Linaro-mm-sig] [ACTIVITY] Status of memory management closing 11.12 http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000896.html Now the patch submission itself... * [Linaro-mm-sig] [PATCH 1/3] dma-buf: Introduce dma buffer sharing mechanism http://lists.linaro.org/pipermail/linaro-mm-sig/2011-December/000922.html Finally, this as a whole is sent to another mailing list... * [DRI-devel] [git pull] dma-buf tree ( January 6th, 2012) http://lists.freedesktop.org/archives/dri-devel/2012-January/017984.html The first challenge of the change appears.... * [DRI-devel] [PATCH] dma-buf: Use EXPORT_SYMBOL ( January 17th, 2012) http://lists.freedesktop.org/archives/dri-devel/2012-January/018250.html

12 years, 8 months

[RFC 0/2] DMA-mapping & IOMMU - physically contiguous allocations

by Marek Szyprowski

Hello, Some devices, which have IOMMU, for some use cases might require to allocate a buffers for DMA which is contiguous in physical memory. Such use cases appears for example in DRM subsystem when one wants to improve performance or use secure buffer protection. I would like to ask if adding a new attribute, as proposed in this RFC is a good idea? I feel that it might be an attribute just for a single driver, but I would like to know your opinion. Should we look for other solution? Best regards -- Marek Szyprowski Samsung Poland R&D Center Marek Szyprowski (2): common: DMA-mapping: add DMA_ATTR_FORCE_CONTIGUOUS attribute ARM: dma-mapping: add support for DMA_ATTR_FORCE_CONTIGUOUS attribute Documentation/DMA-attributes.txt | 9 +++++++++ arch/arm/mm/dma-mapping.c | 41 ++++++++++++++++++++++++++++++-------- include/linux/dma-attrs.h | 1 + 3 files changed, 43 insertions(+), 8 deletions(-) -- 1.7.9.5

12 years, 8 months

Test application for DMABUF support in V4L2

by Tomasz Stanislawski

Hello everyone, This mail contains an application to test DMABUF support in V4L2 for VIVI and S5P-FIMC drivers. The application was tested on linux-media for 3.7 with applied patchset "[PATCHv10 */26] Integration of videobuf2 with DMABUF" on Universal C210 board. Compilation: 1. Fetch media-next, apply patchset [PATCHv10 */26] Integration of videobuf2 with DMABUF 2. Execute 'make headers_install' in kernel source 3. arm-linux-gnueabi-gcc v4l-dbuf.c -o v4l-dbuf -O2 -std=gnu99 -I kernel/usr/include/ This app creates a simple pipeline between VIVI and two FIMC instances. The scenario goes as follows: 1. FIMC0 creates an MMAP buffer at its OUTPUT queue. (testing vb2_dc_alloc) 2. The buffer from 1. is exported using VIDIOC_EXPBUF. (testing exporting in vb2-dma-config) 3. The DMABUF from 2. is imported to VIVI at CAPTURE queue. (testing importing in vb2-vmalloc) 4. Single frame is grabbed from VIVI into the DMABUF. (testing vb2_dc_dmabuf_ops_vmap) 5. FIMC1 creates an MMAP buffer at its OUTPUT queue. (testing vb2_dc_alloc) 6. he buffer from 5. is exported using VIDIOC_EXPBUF. (testing exporting in vb2-dma-config) 7. The DMABUF from 6. is imported by FIMC0 at CAPTURE queue. (testing importing in vb2-dma-contig) 8. FIMC0 is used to process a frame (format conversion/scaling/rotation). 9. USERPTR is created from an anonymous or file mapping. 10. The USERPTR from 9. is passed to FIMC1 at CAPTURE queue. (testing vb2_dc_get_userptr) 11. FIMC1 is used to process a frame (format conversion/scaling/rotation). In the result, the USERPTR contains a frame from VIVI processed by two FIMCs. The app should produce 'Test passed' text on finish. The command line options allow to control the stages of the process -v path path to vivi [default /dev/video0] -f path path to fimc0 [default /dev/video1] -F path path to fimc1 [default /dev/video3] -0 4cc@WxH format between VIVI and FIMC0 -1 4cc@WxH format between FIMC0 and FIMC1 -2 4cc@WxH format between FIMC1 and destination -V vertical flip on FIMC0 -H horizontal flip on FIMC0 -R angle rotation by angle [default 0] on FIMC0 -m size[@file[+offset]] destination mapping, size 0 is adjusted automatically, no file indicate anonymous mapping -h print this help For example: v4l-dbuf -0 RGBP@320x200 -H -R 90 -1 RGB4@96x96 -2 YUYV@32x32 -m 0@/dev/fb0 does: - grab frame from VIVI 320x200 in RGBP (RGB565) format - convert this frame to 96x96 RGB4 (RGB32) format using FIMC0, apply horizontal flip and 90 degree rotation - convert result frame to 32x32 YUYV format using FIMC1 - store result in a framebuffer at /dev/fb0 Please, notice if destination file is missing, then anonymous mapping is used. On platforms that support no SYSMMU for FIMC it is very likely that VIDIOC_QBUF will fail if the size of the result image is larger than a single page. Please use -v, -f, -F options to setup proper paths to VIVI, FIMC0-M2M, and FIMC1-M2M nodes. At each stage the result frames are dumped in PPM format (Netpbm format). Currently, dumping is supported only for RGB565, RGB32 and YUYV formats. The app is not aborted if a format is not supported. Please let us know if you have any further questions. Regards, Tomasz Stanislawski

12 years, 8 months

[PATCHv9 00/25] Integration of videobuf2 with DMABUF

by Tomasz Stanislawski

Hello everyone, This patchset adds support for DMABUF [2] importing and exporting to V4L2 stack. v9: - rebase on 3.6 - change type for fs to __s32 - add support for vb2_ioctl_expbuf - remove patch 'v4l: vb2: add support for DMA_ATTR_NO_KERNEL_MAPPING', it will be posted as a separate patch - fix typos and style in Documentation (from Hans Verkuil) - only vb2-core and vb2-dma-contig selects DMA_SHARED_BUFFER in Kconfig - use data_offset and length while queueing DMABUF - return the most recently used fd at VIDIOC_DQBUF - use (buffer-type, index, plane) tuple instead of mem_offset to identify a for exporting (from Hans Verkuil) - support for DMABUF mmap in vb2-dma-contig (from Laurent Pinchart) - add testing alignment of vaddr and size while verifying userptr against DMA capabilities (from Laurent Pinchart) - substitute VM_DONTDUMP with VM_RESERVED - simplify error handling in vb2_dc_get_dmabuf (from Laurent Pinchart) v8: - rebased on 3.6-rc1 - merged importer and exporter patchsets - fixed missing fields in v4l2_plane32 and v4l2_buffer32 structs - fixed typos/style in documentation - significant reduction of warnings from checkpatch.pl - fixed STREAMOFF issues reported by Dima Zavin [4] by adding __vb2_dqbuf helper to vb2-core - DC fails if userptr is not correctly aligned - add support for DMA attributes in DC - add support for buffers with no kernel mapping - add reference counting on device from allocator context - dummy support for mmap - use dma_get_sgtable, drop vb2_dc_kaddr_to_pages hack and vb2_dc_get_base_sgt helper v7: - support for V4L2_MEMORY_DMABUF in v4l2-compact-ioctl32.c - cosmetic fixes to the documentation - added importing for vmalloc because vmap support in dmabuf for 3.5 was pull-requested - support for dmabuf importing for VIVI - resurrect allocation of dma-contig context - remove reference of alloc_ctx in dma-contig buffer - use sg_alloc_table_from_pages - fix DMA scatterlist calls to use orig_nents instead of nents - fix memleak in vb2_dc_sgt_foreach_page (use orig_nents instead of nents) v6: - fixed missing entry in v4l2_memory_names - fixed a bug occuring after get_user_pages failure - fixed a bug caused by using invalid vma for get_user_pages - prepare/finish no longer call dma_sync for dmabuf buffers v5: - removed change of importer/exporter behaviour - fixes vb2_dc_pages_to_sgt basing on Laurent's hints - changed pin/unpin words to lock/unlock in Doc v4: - rebased on mainline 3.4-rc2 - included missing importing support for s5p-fimc and s5p-tv - added patch for changing map/unmap for importers - fixes to Documentation part - coding style fixes - pairing {map/unmap}_dmabuf in vb2-core - fixing variable types and semantic of arguments in videobufb2-dma-contig.c v3: - rebased on mainline 3.4-rc1 - split 'code refactor' patch to multiple smaller patches - squashed fixes to Sumit's patches - patchset is no longer dependant on 'DMA mapping redesign' - separated path for handling IO and non-IO mappings - add documentation for DMABUF importing to V4L - removed all DMABUF exporter related code - removed usage of dma_get_pages extension v2: - extended VIDIOC_EXPBUF argument from integer memoffset to struct v4l2_exportbuffer - added patch that breaks DMABUF spec on (un)map_atachment callcacks but allows to work with existing implementation of DMABUF prime in DRM - all dma-contig code refactoring patches were squashed - bugfixes v1: List of changes since [1]. - support for DMA api extension dma_get_pages, the function is used to retrieve pages used to create DMA mapping. - small fixes/code cleanup to videobuf2 - added prepare and finish callbacks to vb2 allocators, it is used keep consistency between dma-cpu acess to the memory (by Marek Szyprowski) - support for exporting of DMABUF buffer in V4L2 and Videobuf2, originated from [3]. - support for dma-buf exporting in vb2-dma-contig allocator - support for DMABUF for s5p-tv and s5p-fimc (capture interface) drivers, originated from [3] - changed handling for userptr buffers (by Marek Szyprowski, Andrzej Pietrasiewicz) - let mmap method to use dma_mmap_writecombine call (by Marek Szyprowski) [1] http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/4296… [2] https://lkml.org/lkml/2011/12/26/29 [3] http://thread.gmane.org/gmane.linux.kernel.cross-arch/12819 [4] http://article.gmane.org/gmane.linux.drivers.video-input-infrastructure/497… Laurent Pinchart (2): v4l: vb2-dma-contig: shorten vb2_dma_contig prefix to vb2_dc v4l: vb2-dma-contig: reorder functions Marek Szyprowski (4): v4l: vb2: add prepare/finish callbacks to allocators v4l: vb2-dma-contig: add prepare/finish to dma-contig allocator v4l: vb2-dma-contig: let mmap method to use dma_mmap_coherent call v4l: vb2-dma-contig: fail if user ptr buffer is not correctly aligned Sumit Semwal (4): v4l: Add DMABUF as a memory type v4l: vb2: add support for shared buffer (dma_buf) v4l: vb: remove warnings about MEMORY_DMABUF v4l: vb2-dma-contig: add support for dma_buf importing Tomasz Stanislawski (15): Documentation: media: description of DMABUF importing in V4L2 v4l: vb2-dma-contig: remove reference of alloc_ctx from a buffer v4l: vb2-dma-contig: add support for scatterlist in userptr mode v4l: vb2-vmalloc: add support for dmabuf importing v4l: vivi: support for dmabuf importing v4l: s5p-tv: mixer: support for dmabuf importing v4l: s5p-fimc: support for dmabuf importing Documentation: media: description of DMABUF exporting in V4L2 v4l: add buffer exporting via dmabuf v4l: vb2: add buffer exporting via dmabuf v4l: vb2-dma-contig: add support for DMABUF exporting v4l: vb2-dma-contig: add reference counting for a device from allocator context v4l: s5p-fimc: support for dmabuf exporting v4l: s5p-tv: mixer: support for dmabuf exporting v4l: s5p-mfc: support for dmabuf exporting Documentation/DocBook/media/v4l/compat.xml | 7 + Documentation/DocBook/media/v4l/io.xml | 183 +++++- Documentation/DocBook/media/v4l/v4l2.xml | 1 + .../DocBook/media/v4l/vidioc-create-bufs.xml | 16 +- Documentation/DocBook/media/v4l/vidioc-expbuf.xml | 212 ++++++ Documentation/DocBook/media/v4l/vidioc-qbuf.xml | 17 + Documentation/DocBook/media/v4l/vidioc-reqbufs.xml | 47 +- drivers/media/video/Kconfig | 2 + drivers/media/video/s5p-fimc/fimc-capture.c | 11 +- drivers/media/video/s5p-mfc/s5p_mfc_dec.c | 14 + drivers/media/video/s5p-mfc/s5p_mfc_enc.c | 14 + drivers/media/video/s5p-tv/mixer_video.c | 12 +- drivers/media/video/v4l2-compat-ioctl32.c | 19 + drivers/media/video/v4l2-dev.c | 1 + drivers/media/video/v4l2-ioctl.c | 11 + drivers/media/video/videobuf-core.c | 4 + drivers/media/video/videobuf2-core.c | 300 ++++++++- drivers/media/video/videobuf2-dma-contig.c | 695 ++++++++++++++++++-- drivers/media/video/videobuf2-memops.c | 40 -- drivers/media/video/videobuf2-vmalloc.c | 56 ++ drivers/media/video/vivi.c | 2 +- include/linux/videodev2.h | 35 + include/media/v4l2-ioctl.h | 2 + include/media/videobuf2-core.h | 38 ++ include/media/videobuf2-memops.h | 5 - 25 files changed, 1608 insertions(+), 136 deletions(-) create mode 100644 Documentation/DocBook/media/v4l/vidioc-expbuf.xml -- 1.7.9.5

12 years, 8 months

[PATCH 1/5] dma-buf: remove fallback for !CONFIG_DMA_SHARED_BUFFER

by Maarten Lankhorst

Documentation says that code requiring dma-buf should add it to select, so inline fallbacks are not going to be used. A link error will make it obvious what went wrong, instead of silently doing nothing at runtime. Signed-off-by: Maarten Lankhorst <maarten.lankhorst(a)canonical.com> --- include/linux/dma-buf.h | 99 ----------------------------------------------- 1 file changed, 99 deletions(-) diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index eb48f38..bd2e52c 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -156,7 +156,6 @@ static inline void get_dma_buf(struct dma_buf *dmabuf) get_file(dmabuf->file); } -#ifdef CONFIG_DMA_SHARED_BUFFER struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, struct device *dev); void dma_buf_detach(struct dma_buf *dmabuf, @@ -184,103 +183,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, unsigned long); void *dma_buf_vmap(struct dma_buf *); void dma_buf_vunmap(struct dma_buf *, void *vaddr); -#else - -static inline struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, - struct device *dev) -{ - return ERR_PTR(-ENODEV); -} - -static inline void dma_buf_detach(struct dma_buf *dmabuf, - struct dma_buf_attachment *dmabuf_attach) -{ - return; -} - -static inline struct dma_buf *dma_buf_export(void *priv, - const struct dma_buf_ops *ops, - size_t size, int flags) -{ - return ERR_PTR(-ENODEV); -} - -static inline int dma_buf_fd(struct dma_buf *dmabuf, int flags) -{ - return -ENODEV; -} - -static inline struct dma_buf *dma_buf_get(int fd) -{ - return ERR_PTR(-ENODEV); -} - -static inline void dma_buf_put(struct dma_buf *dmabuf) -{ - return; -} - -static inline struct sg_table *dma_buf_map_attachment( - struct dma_buf_attachment *attach, enum dma_data_direction write) -{ - return ERR_PTR(-ENODEV); -} - -static inline void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, - struct sg_table *sg, enum dma_data_direction dir) -{ - return; -} - -static inline int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, - size_t start, size_t len, - enum dma_data_direction dir) -{ - return -ENODEV; -} - -static inline void dma_buf_end_cpu_access(struct dma_buf *dmabuf, - size_t start, size_t len, - enum dma_data_direction dir) -{ -} - -static inline void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, - unsigned long pnum) -{ - return NULL; -} - -static inline void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, - unsigned long pnum, void *vaddr) -{ -} - -static inline void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long pnum) -{ - return NULL; -} - -static inline void dma_buf_kunmap(struct dma_buf *dmabuf, - unsigned long pnum, void *vaddr) -{ -} - -static inline int dma_buf_mmap(struct dma_buf *dmabuf, - struct vm_area_struct *vma, - unsigned long pgoff) -{ - return -ENODEV; -} - -static inline void *dma_buf_vmap(struct dma_buf *dmabuf) -{ - return NULL; -} - -static inline void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) -{ -} -#endif /* CONFIG_DMA_SHARED_BUFFER */ #endif /* __DMA_BUF_H__ */

12 years, 8 months

Re: [Linaro-mm-sig] [RFC] New dma_buf -> EGLImage EGL extension

by Maarten Lankhorst

Hey, Bit late reply, hopefully not too late. Op 30-08-12 16:00, Tom Cooksey schreef: > Hi All, > > Over the last few months I've been working on & off with a few people from > Linaro on a new EGL extension. The extension allows constructing an EGLImage > from a (set of) dma_buf file descriptors, including support for multi-plane > YUV. I envisage the primary use-case of this extension to be importing video > frames from v4l2 into the EGL/GLES graphics driver to texture from. > Originally the intent was to develop this as a Khronos-ratified extension. > However, this is a little too platform-specific to be an officially > sanctioned Khronos extension. It also goes against the general "EGLStream" > direction the EGL working group is going in. As such, the general feeling > was to make this an EXT "multi-vendor" extension with no official stamp of > approval from Khronos. As this is no-longer intended to be a Khronos > extension, I've re-written it to be a lot more Linux & dma_buf specific. It > also allows me to circulate the extension more widely (I.e. To those outside > Khronos membership). > > ARM are implementing this extension for at least our Mali-T6xx driver and > likely earlier drivers too. I am sending this e-mail to solicit feedback, > both from other vendors who might implement this extension (Mesa3D?) and > from potential users of the extension. However, any feedback is welcome. > Please find the extension text as it currently stands below. There several > open issues which I've proposed solutions for, but I'm not really happy with > those proposals and hoped others could chip-in with better ideas. There are > likely other issues I've not thought about which also need to be added and > addressed. > > Once there's a general consensus or if no-one's interested, I'll update the > spec, move it out of Draft status and get it added to the Khronos registry, > which includes assigning values for the new symbols. > > > Cheers, > > Tom > > > ---------8<--------- > > > Name > > EXT_image_dma_buf_import > > Name Strings > > EGL_EXT_image_dma_buf_import > > Contributors > > Jesse Barker > Rob Clark > Tom Cooksey > > Contacts > > Jesse Barker (jesse 'dot' barker 'at' linaro 'dot' org) > Tom Cooksey (tom 'dot' cooksey 'at' arm 'dot' com) > > Status > > DRAFT > > Version > > Version 3, August 16, 2012 > > Number > > EGL Extension ??? > > Dependencies > > EGL 1.2 is required. > > EGL_KHR_image_base is required. > > The EGL implementation must be running on a Linux kernel supporting the > dma_buf buffer sharing mechanism. > > This extension is written against the wording of the EGL 1.2 > Specification. > > Overview > > This extension allows creating an EGLImage from a Linux dma_buf file > descriptor or multiple file descriptors in the case of multi-plane YUV > images. > > New Types > > None > > New Procedures and Functions > > None > > New Tokens > > Accepted by the <target> parameter of eglCreateImageKHR: > > EGL_LINUX_DMA_BUF_EXT > > Accepted as an attribute in the <attrib_list> parameter of > eglCreateImageKHR: > > EGL_LINUX_DRM_FOURCC_EXT > EGL_DMA_BUF_PLANE0_FD_EXT > EGL_DMA_BUF_PLANE0_OFFSET_EXT > EGL_DMA_BUF_PLANE0_PITCH_EXT > EGL_DMA_BUF_PLANE1_FD_EXT > EGL_DMA_BUF_PLANE1_OFFSET_EXT > EGL_DMA_BUF_PLANE1_PITCH_EXT > EGL_DMA_BUF_PLANE2_FD_EXT > EGL_DMA_BUF_PLANE2_OFFSET_EXT > EGL_DMA_BUF_PLANE2_PITCH_EXT You might want to add PLANE3 just in case someone wants to import a AYUV image. > Additions to Chapter 2 of the EGL 1.2 Specification (EGL Operation) > > Add to section 2.5.1 "EGLImage Specification" (as defined by the > EGL_KHR_image_base specification), in the description of > eglCreateImageKHR: > > "Values accepted for <target> are listed in Table aaa, below. > > > +-------------------------+--------------------------------------------+ > | <target> | Notes > | > > +-------------------------+--------------------------------------------+ > | EGL_LINUX_DMA_BUF_EXT | Used for EGLImages imported from Linux > | > | | dma_buf file descriptors > | > > +-------------------------+--------------------------------------------+ > Table aaa. Legal values for eglCreateImageKHR <target> parameter > > ... > > If <target> is EGL_LINUX_DMA_BUF_EXT, <dpy> must be a valid display, > <ctx> > must be EGL_NO_CONTEXT, and <buffer> must be NULL, cast into the type > EGLClientBuffer. The details of the image is specified by the attributes > passed into eglCreateImageKHR. Required attributes and their values are > as > follows: > > * EGL_WIDTH & EGL_HEIGHT: The logical dimensions of the buffer in > pixels > > * EGL_LINUX_DRM_FOURCC_EXT: The pixel format of the buffer, as > specified > by drm_fourcc.h and used as the pixel_format parameter of the > drm_mode_fb_cmd2 ioctl. > > * EGL_DMA_BUF_PLANE0_FD_EXT: The dma_buf file descriptor of plane 0 > of > the image. > > * EGL_DMA_BUF_PLANE0_OFFSET_EXT: The offset from the start of the > dma_buf of the first sample in plane 0, in bytes. > > * EGL_DMA_BUF_PLANE0_PITCH_EXT: The number of bytes between the > start of > subsequent rows of samples in plane 0. May have special meaning > for > non-linear formats. > > For images in an RGB color-space or those using a single-plane YUV > format, > only the first plane's file descriptor, offset & pitch should be > specified. > For semi-planar YUV formats, the chroma samples are stored in plane 1 > and > for fully planar formats, U-samples are stored in plane 1 and V-samples > are > stored in plane 2. Planes 1 & 2 are specified by the following > attributes, > which have the same meanings as defined above for plane 0: > Nitpick, Y'CbCr not YUV. How do you want to deal with the case where Y' and CbCr are different hardware buffers? Could some support for 2d arrays be added in case Y' and CbCr are separated into top/bottom fields? How are semi-planar/planar formats handled that have a different width/height for Y' and CbCr? (YUV420) ~Maarten

12 years, 9 months

[RFC] New dma_buf -> EGLImage EGL extension - New draft!

by Tom Cooksey

Hi All, After receiving a fair bit of feedback (thanks!), I've updated the EGL_EXT_image_dma_buf_import spec and expanded it to resolve a number of the issues. Please find the latest draft below and let me know any additional feedback you might have, either on the lists or by private e-mail - I don't mind which. I think the only remaining issue now is if we need a mechanism whereby an application can query which drm_fourcc.h formats EGL supports or if just failing with EGL_BAD_MATCH when the application has use one EGL doesn't support is sufficient. Any thoughts? Cheers, Tom --------------------8<-------------------- Name EXT_image_dma_buf_import Name Strings EGL_EXT_image_dma_buf_import Contributors Jesse Barker Rob Clark Tom Cooksey Contacts Jesse Barker (jesse 'dot' barker 'at' linaro 'dot' org) Tom Cooksey (tom 'dot' cooksey 'at' arm 'dot' com) Status DRAFT Version Version 4, October 04, 2012 Number EGL Extension ??? Dependencies EGL 1.2 is required. EGL_KHR_image_base is required. The EGL implementation must be running on a Linux kernel supporting the dma_buf buffer sharing mechanism. This extension is written against the wording of the EGL 1.2 Specification. Overview This extension allows creating an EGLImage from a Linux dma_buf file descriptor or multiple file descriptors in the case of multi-plane YUV images. New Types None New Procedures and Functions None New Tokens Accepted by the <target> parameter of eglCreateImageKHR: EGL_LINUX_DMA_BUF_EXT Accepted as an attribute in the <attrib_list> parameter of eglCreateImageKHR: EGL_LINUX_DRM_FOURCC_EXT EGL_DMA_BUF_PLANE0_FD_EXT EGL_DMA_BUF_PLANE0_OFFSET_EXT EGL_DMA_BUF_PLANE0_PITCH_EXT EGL_DMA_BUF_PLANE1_FD_EXT EGL_DMA_BUF_PLANE1_OFFSET_EXT EGL_DMA_BUF_PLANE1_PITCH_EXT EGL_DMA_BUF_PLANE2_FD_EXT EGL_DMA_BUF_PLANE2_OFFSET_EXT EGL_DMA_BUF_PLANE2_PITCH_EXT EGL_YUV_COLOR_SPACE_HINT_EXT EGL_SAMPLE_RANGE_HINT_EXT EGL_YUV_CHROMA_HORIZONTAL_SITING_HINT_EXT EGL_YUV_CHROMA_VERTICAL_SITING_HINT_EXT Accepted as the value for the EGL_YUV_COLOR_SPACE_HINT_EXT attribute: EGL_ITU_REC601_EXT EGL_ITU_REC709_EXT EGL_ITU_REC2020_EXT Accepted as the value for the EGL_SAMPLE_RANGE_HINT_EXT attribute: EGL_YUV_FULL_RANGE_EXT EGL_YUV_NARROW_RANGE_EXT Accepted as the value for the EGL_YUV_CHROMA_HORIZONTAL_SITING_HINT_EXT & EGL_YUV_CHROMA_VERTICAL_SITING_HINT_EXT attributes: EGL_YUV_CHROMA_SITING_0_EXT EGL_YUV_CHROMA_SITING_0_5_EXT Additions to Chapter 2 of the EGL 1.2 Specification (EGL Operation) Add to section 2.5.1 "EGLImage Specification" (as defined by the EGL_KHR_image_base specification), in the description of eglCreateImageKHR: "Values accepted for <target> are listed in Table aaa, below. +-------------------------+--------------------------------------------+ | <target> | Notes | +-------------------------+--------------------------------------------+ | EGL_LINUX_DMA_BUF_EXT | Used for EGLImages imported from Linux | | | dma_buf file descriptors | +-------------------------+--------------------------------------------+ Table aaa. Legal values for eglCreateImageKHR <target> parameter ... If <target> is EGL_LINUX_DMA_BUF_EXT, <dpy> must be a valid display, <ctx> must be EGL_NO_CONTEXT, and <buffer> must be NULL, cast into the type EGLClientBuffer. The details of the image is specified by the attributes passed into eglCreateImageKHR. Required attributes and their values are as follows: * EGL_WIDTH & EGL_HEIGHT: The logical dimensions of the buffer in pixels * EGL_LINUX_DRM_FOURCC_EXT: The pixel format of the buffer, as specified by drm_fourcc.h and used as the pixel_format parameter of the drm_mode_fb_cmd2 ioctl. * EGL_DMA_BUF_PLANE0_FD_EXT: The dma_buf file descriptor of plane 0 of the image. * EGL_DMA_BUF_PLANE0_OFFSET_EXT: The offset from the start of the dma_buf of the first sample in plane 0, in bytes. * EGL_DMA_BUF_PLANE0_PITCH_EXT: The number of bytes between the start of subsequent rows of samples in plane 0. May have special meaning for non-linear formats. For images in an RGB color-space or those using a single-plane YUV format, only the first plane's file descriptor, offset & pitch should be specified. For semi-planar YUV formats, the chroma samples are stored in plane 1 and for fully planar formats, U-samples are stored in plane 1 and V-samples are stored in plane 2. Planes 1 & 2 are specified by the following attributes, which have the same meanings as defined above for plane 0: * EGL_DMA_BUF_PLANE1_FD_EXT * EGL_DMA_BUF_PLANE1_OFFSET_EXT * EGL_DMA_BUF_PLANE1_PITCH_EXT * EGL_DMA_BUF_PLANE2_FD_EXT * EGL_DMA_BUF_PLANE2_OFFSET_EXT * EGL_DMA_BUF_PLANE2_PITCH_EXT In addition to the above required attributes, the application may also provide hints as to how the data should be interpreted by the GL. If any of these hints are not specified, the GL will guess based on the pixel format passed as the EGL_LINUX_DRM_FOURCC_EXT attribute or may fall-back to some default value. Not all GLs will be able to support all combinations of these hints and are free to use whatever settings they choose to achieve the closest possible match. * EGL_YUV_COLOR_SPACE_HINT_EXT: The color-space the data is in. Only relevant for images in a YUV format, ignored when specified for an image in an RGB format. Accepted values are: EGL_ITU_REC601_EXT, EGL_ITU_REC709_EXT & EGL_ITU_REC2020_EXT. * EGL_YUV_CHROMA_HORIZONTAL_SITING_HINT_EXT & EGL_YUV_CHROMA_VERTICAL_SITING_HINT_EXT: Where chroma samples are sited relative to luma samples when the image is in a sub-sampled format. When the image is not using chroma sub-sampling, the luma and chroma samples are assumed to be co-sited. Siting is split into the vertical and horizontal and is in a fixed range. A siting of zero means the first luma sample is taken from the same position in that dimension as the chroma sample. This is best illustrated in the diagram below: (0.5, 0.5) (0.0, 0.5) (0.0, 0.0) + + + + + + + + * + * + x x x x + + + + + + + + + + + + + + + + + + + + * + * + x x x x + + + + + + + + + + + + Luma samples (+), Chroma samples (x) Chrome & Luma samples (*) Note this attribute is ignored for RGB images and non sub-sampled YUV images. Accepted values are: EGL_YUV_CHROMA_SITING_0_EXT (0.0) & EGL_YUV_CHROMA_SITING_0_5_EXT (0.5) * EGL_SAMPLE_RANGE_HINT_EXT: The numerical range of samples. Only relevant for images in a YUV format, ignored when specified for images in an RGB format. Accepted values are: EGL_YUV_FULL_RANGE_EXT (0-256) & EGL_YUV_NARROW_RANGE_EXT (16-235). If eglCreateImageKHR is successful for a EGL_LINUX_DMA_BUF_EXT target, the EGL takes ownership of the file descriptor and is responsible for closing it, which it may do at any time while the EGLDisplay is initialized." Add to the list of error conditions for eglCreateImageKHR: "* If <target> is EGL_LINUX_DMA_BUF_EXT and <buffer> is not NULL, the error EGL_BAD_PARAMETER is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT, and the list of attributes is incomplete, EGL_BAD_PARAMETER is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT, and the EGL_LINUX_DRM_FOURCC_EXT attribute is set to a format not supported by the EGL, EGL_BAD_MATCH is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT, and the EGL_LINUX_DRM_FOURCC_EXT attribute indicates a single-plane format, EGL_BAD_ATTRIBUTE is generated if any of the EGL_DMA_BUF_PLANE1_* or EGL_DMA_BUF_PLANE2_* attributes are specified. * If <target> is EGL_LINUX_DMA_BUF_EXT and the value specified for EGL_YUV_COLOR_SPACE_HINT_EXT is not EGL_ITU_REC601_EXT, EGL_ITU_REC709_EXT or EGL_ITU_REC2020_EXT, EGL_BAD_ATTRIBUTE is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT and the value specified for EGL_SAMPLE_RANGE_HINT_EXT is not EGL_YUV_FULL_RANGE_EXT or EGL_YUV_NARROW_RANGE_EXT, EGL_BAD_ATTRIBUTE is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT and the value specified for EGL_YUV_CHROMA_HORIZONTAL_SITING_HINT_EXT or EGL_YUV_CHROMA_VERTICAL_SITING_HINT_EXT is not EGL_YUV_CHROMA_SITING_0_EXT or EGL_YUV_CHROMA_SITING_0_5_EXT, EGL_BAD_ATTRIBUTE is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT and one or more of the values specified for a plane's pitch or offset isn't supported by EGL, EGL_BAD_ACCESS is generated. * If <target> is EGL_LINUX_DMA_BUF_EXT and eglCreateImageKHR fails, EGL does not retain ownership of the file descriptor and it is the responsibility of the application to close it." Issues 1. Should this be a KHR or EXT extension? ANSWER: EXT. Khronos EGL working group not keen on this extension as it is seen as contradicting the EGLStream direction the specification is going in. The working group recommends creating additional specs to allow an EGLStream producer/consumer connected to v4l2/DRM or any other Linux interface. 2. Should this be a generic any platform extension, or a Linux-only extension which explicitly states the handles are dma_buf fds? ANSWER: There's currently no intention to port this extension to any OS not based on the Linux kernel. Consequently, this spec can be explicitly written against Linux and the dma_buf API. 3. Does ownership of the file descriptor pass to the EGL library? ANSWER: If eglCreateImageKHR is successful, EGL assumes ownership of the file descriptors and is responsible for closing them. 4. How are the different YUV color spaces handled (BT.709/BT.601)? ANSWER: The pixel formats defined in drm_fourcc.h only specify how the data is laid out in memory. It does not define how that data should be interpreted. Added a new EGL_YUV_COLOR_SPACE_HINT_EXT attribute to allow the application to specify which color space the data is in to allow the GL to choose an appropriate set of co-efficients if it needs to convert that data to RGB for example. 5. What chroma-siting is used for sub-sampled YUV formats? ANSWER: The chroma siting is not specified by either the v4l2 or DRM APIs. This is similar to the color-space issue (4) in that the chroma siting doesn't affect how the data is stored in memory. However, the GL will need to know the siting in order to filter the image correctly. While the visual impact of getting the siting wrong is minor, provision should be made to allow an application to specify the siting if desired. Added additional EGL_YUV_CHROMA_HORIZONTAL_SITING_HINT_EXT & EGL_YUV_CHROMA_VERTICAL_SITING_HINT_EXT attributes to allow the siting to be specified using a set of pre-defined values (0 or 0.5). 6. How can an application query which formats the EGL implementation supports? PROPOSAL: Don't provide a query mechanism but instead add an error condition that EGL_BAD_MATCH is raised if the EGL implementation doesn't support that particular format. 7. Which image formats should be supported and how is format specified? Seem to be two options 1) specify a new enum in this specification and enumerate all possible formats. 2) Use an existing enum already in Linux, either v4l2_mbus_pixelcode and/or those formats listed in drm_fourcc.h? ANSWER: Go for option 2) and just use values defined in drm_fourcc.h. 8. How can AYUV images be handled? ANSWER: At least on fourcc.org and in drm_fourcc.h, there only seems to be a single AYUV format and that is a packed format, so everything, including the alpha component would be in the first plane. 9. How can you import interlaced images? ANSWER: Interlaced frames are usually stored with the top & bottom fields interleaved in a single buffer. As the fields would need to be displayed as at different times, the application would create two EGLImages from the same buffer, one for the top field and another for the bottom. Both EGLImages would set the pitch to 2x the buffer width and the second EGLImage would use a suitable offset to indicate it started on the second line of the buffer. This should work regardless of whether the data is packed in a single plane, semi-planar or multi-planar. If each interlaced field is stored in a separate buffer then it should be trivial to create two EGLImages, one for each field's buffer. 10. How are semi-planar/planar formats handled that have a different width/height for Y' and CbCr such as YUV420? ANSWER: The spec says EGL_WIDTH & EGL_HEIGHT specify the *logical* width and height of the buffer in pixels. For pixel formats with sub-sampled Chroma values, it should be trivial for the EGL implementation to calculate the width/height of the Chroma sample buffers using the logical width & height and by inspecting the pixel format passed as the EGL_LINUX_DRM_FOURCC_EXT attribute. I.e. If the pixel format says it's YUV420, the Chroma buffer's width = EGL_WIDTH/2 & height =EGL_HEIGHT/2. 11. How are Bayer formats handled? ANSWER: As of Linux 2.6.34, drm_fourcc.h does not include any Bayer formats. However, future kernel versions may add such formats in which case they would be handled in the same way as any other format. 12. Should the spec support buffers which have samples in a "narrow range"? Content sampled from older analogue sources typically don't use the full (0-256) range of the data type storing the sample and instead use a narrow (16-235) range to allow some headroom & toeroom in the signals to avoid clipping signals which overshoot slightly during processing. This is sometimes known as signals using "studio swing". ANSWER: Add a new attribute to define if the samples use a narrow 16-235 range or the full 0-256 range. 13. Specifying the color space and range seems cumbersome, why not just allow the application to specify the full YUV->RGB color conversion matrix? ANSWER: Some hardware may not be able to use an arbitrary conversion matrix and needs to select an appropriate pre-defined matrix based on the color space and the sample range. 14. How do you handle EGL implementations which have restrictions on pitch and/or offset? ANSWER: Buffers being imported using dma_buf pretty much have to be allocated by a kernel-space driver. As such, it is expected that a system integrator would make sure all devices which allocate buffers suitable for exporting make sure they use a pitch supported by all possible importers. However, it is still possible eglCreateImageKHR can fail due to an unsupported pitch. Added a new error to the list indicating this. 15. Should this specification also describe how to export an existing EGLImage as a dma_buf file descriptor? ANSWER: No. Importing and exporting buffers are two separate operations and importing an existing dma_buf fd into an EGLImage is useful functionality in itself. Agree that exporting an EGLImage as a dma_buf fd is useful, E.g. it could be used by an OpenMAX IL implementation's OMX_UseEGLImage function to give access to the buffer backing an EGLImage to video hardware. However, exporting can be split into a separate extension specification. Revision History #4 (Tom Cooksey, October 04, 2012) - Fixed issue numbering! - Added issues 8 - 15. - Promoted proposal for Issue 3 to be the answer. - Added an additional attribute to allow an application to specify the color space as a hint which should address issue 4. - Added an additional attribute to allow an application to specify the chroma siting as a hint which should address issue 5. - Added an additional attribute to allow an application to specify the sample range as a hint which should address the new issue 12. - Added language to end of error section clarifying who owns the fd passed to eglCreateImageKHR if an error is generated. #3 (Tom Cooksey, August 16, 2012) - Changed name from EGL_EXT_image_external and re-written language to explicitly state this for use with Linux & dma_buf. - Added a list of issues, including some still open ones. #2 (Jesse Barker, May 30, 2012) - Revision to split eglCreateImageKHR functionality from export Functionality. - Update definition of EGLNativeBufferType to be a struct containing a list of handles to support multi-buffer/multi-planar formats. #1 (Jesse Barker, March 20, 2012) - Initial draft.

12 years, 9 months

[GIT PULL] CMA and DMA-mapping updates for v3.7

by Marek Szyprowski

Hi Linus, I would like to ask for pulling another set of CMA and DMA-mapping framework updates for v3.7. The following changes since commit a0d271cbfed1dd50278c6b06bead3d00ba0a88f9: Linux 3.6 (2012-09-30 16:47:46 -0700) are available in the git repository at: git://git.linaro.org/people/mszyprowski/linux-dma-mapping.git for-v3.7 for you to fetch changes up to 461b6f0d3d7d4e556035463b531136b034b7433e: Merge branch 'next-cleanup' into for-v3.7 (2012-10-02 09:24:24 +0200) ---------------------------------------------------------------- This time the pull request is rather small, because the further redesign patches were not ready on time. This pull request consists of the patches which extend ARM DMA-mapping subsystem with support for CPU coherent (ACP) DMA busses. The first client of the new version is HighBank SATA driver. The second part of the pull request includes various cleanup for both CMA common code and ARM DMA-mapping subsystem. Thanks! Best regards Marek Szyprowski Samsung Poland R&D Center Patch summary: Hiroshi Doyu (3): ARM: dma-mapping: Small logical clean up ARM: dma-mapping: Refrain noisy console message ARM: dma-mapping: Remove unsed var at arm_coherent_iommu_unmap_page Marek Szyprowski (1): Merge branch 'next-cleanup' into for-v3.7 Michal Nazarewicz (1): drivers: dma-contiguous: refactor dma_alloc_from_contiguous() Rob Herring (4): ARM: add coherent dma ops ARM: add coherent iommu dma ops ARM: kill off arch_is_coherent ARM: highbank: add coherent DMA setup .../devicetree/bindings/ata/ahci-platform.txt | 3 + .../devicetree/bindings/dma/arm-pl330.txt | 3 + .../devicetree/bindings/net/calxeda-xgmac.txt | 3 + arch/arm/boot/dts/highbank.dts | 1 + arch/arm/include/asm/barrier.h | 7 +- arch/arm/include/asm/dma-mapping.h | 1 + arch/arm/include/asm/memory.h | 8 - arch/arm/mach-highbank/highbank.c | 52 ++++ arch/arm/mm/dma-mapping.c | 264 +++++++++++++++----- arch/arm/mm/mmu.c | 17 +- drivers/base/dma-contiguous.c | 18 +- 11 files changed, 283 insertions(+), 94 deletions(-)

12 years, 9 months

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