lwn.git/Documentation/userspace-api/media/v4l/vidioc-reqbufs.rst, branch docs-6.8-2

media: videobuf2: handle V4L2_MEMORY_FLAG_NON_COHERENT flag

2021-09-30T08:07:57+00:00

This patch lets user-space request a non-coherent memory allocation during CREATE_BUFS and REQBUFS ioctl calls. = CREATE_BUFS struct v4l2_create_buffers has seven 4-byte reserved areas, so reserved[0] is renamed to ->flags. The struct, thus, now has six reserved 4-byte regions. = CREATE_BUFS32 struct v4l2_create_buffers32 has seven 4-byte reserved areas, so reserved[0] is renamed to ->flags. The struct, thus, now has six reserved 4-byte regions. = REQBUFS We use one byte of a 4 byte ->reserved[1] member of struct v4l2_requestbuffers. The struct, thus, now has reserved 3 bytes. Signed-off-by: Sergey Senozhatsky Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab

media: videobuf2: add V4L2_MEMORY_FLAG_NON_COHERENT flag

2021-09-30T08:07:57+00:00

By setting or clearing the V4L2_MEMORY_FLAG_NON_COHERENT flag user-space should be able to hint vb2 that either non-coherent (if supported) or coherent memory should be used for the buffer allocation. Signed-off-by: Sergey Senozhatsky Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab

media: docs: uAPI: fix table output in LaTeX/PDF format

2021-03-11T10:59:40+00:00

There are lots of tables that are not properly displayed in LaTeX/PDF. Fix the tablecolumns, add longtable where needed and LaTeX formatting macros, in order to address such issues. Signed-off-by: Mauro Carvalho Chehab

media: docs: make V4L documents more compatible with Sphinx 3.1+

2020-10-15T05:49:39+00:00

Sphinx 3.x broke support for the cdomain.py extension, as the c domain code was rewritten. Due to that, the c tags need to be re-written, in order to use the new c domain notation. Signed-off-by: Mauro Carvalho Chehab

Merge tag 'v5.9-rc7' into patchwork

2020-10-04T10:19:12+00:00

Linux 5.9-rc7 * tag 'v5.9-rc7': (683 commits) Linux 5.9-rc7 mm/thp: Split huge pmds/puds if they're pinned when fork() mm: Do early cow for pinned pages during fork() for ptes mm/fork: Pass new vma pointer into copy_page_range() mm: Introduce mm_struct.has_pinned mm: validate pmd after splitting mm: don't rely on system state to detect hot-plug operations mm: replace memmap_context by meminit_context arch/x86/lib/usercopy_64.c: fix __copy_user_flushcache() cache writeback lib/memregion.c: include memregion.h lib/string.c: implement stpcpy mm/migrate: correct thp migration stats mm/gup: fix gup_fast with dynamic page table folding mm: memcontrol: fix missing suffix of workingset_restore mm, THP, swap: fix allocating cluster for swapfile by mistake mm: slab: fix potential double free in ___cache_free Documentation/llvm: Fix clang target examples io_uring: ensure async buffered read-retry is setup properly KVM: SVM: Add a dedicated INVD intercept routine io_uring: don't unconditionally set plug->nowait = true ...

media: media/v4l2: remove V4L2_FLAG_MEMORY_NON_CONSISTENT flag

2020-09-14T13:28:06+00:00

The patch partially reverts some of the UAPI bits of the buffer cache management hints. Namely, the queue consistency (memory coherency) user-space hint because, as it turned out, the kernel implementation of this feature was misusing DMA_ATTR_NON_CONSISTENT. The patch reverts both kernel and user space parts: removes the DMA consistency attr functions, rolls back changes to v4l2_requestbuffers, v4l2_create_buffers structures and corresponding UAPI functions (plus compat32 layer) and cleans up the documentation. [hverkuil: fixed a few typos in the commit log] [hverkuil: fixed vb2_core_reqbufs call in drivers/media/dvb-core/dvb_vb2.c] [mchehab: fixed a typo in the commit log: revers->reverts] Signed-off-by: Christoph Hellwig Signed-off-by: Sergey Senozhatsky Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab

media: docs: use the new SPDX header for GFDL-1.1 on *.rst files

2020-09-01T12:13:30+00:00

SPDX v3.10 gained support for GFDL-1.1 with no invariant sections: https://spdx.org/licenses/GFDL-1.1-no-invariants-or-later.html So, remove the license text, replacing them by this new SPDX license. Signed-off-by: Mauro Carvalho Chehab

media: videobuf2: handle V4L2_FLAG_MEMORY_NON_CONSISTENT flag

2020-06-23T11:32:41+00:00

This patch lets user-space to request a non-consistent memory allocation during CREATE_BUFS and REQBUFS ioctl calls. = CREATE_BUFS struct v4l2_create_buffers has seven 4-byte reserved areas, so reserved[0] is renamed to ->flags. The struct, thus, now has six reserved 4-byte regions. = CREATE_BUFS32 struct v4l2_create_buffers32 has seven 4-byte reserved areas, so reserved[0] is renamed to ->flags. The struct, thus, now has six reserved 4-byte regions. = REQBUFS We use one bit of a ->reserved[1] member of struct v4l2_requestbuffers, which is now renamed to ->flags. Unlike v4l2_create_buffers, struct v4l2_requestbuffers does not have enough reserved room. Therefore for backward compatibility ->reserved and ->flags were put into anonymous union. Signed-off-by: Sergey Senozhatsky Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab

media: videobuf2: add V4L2_FLAG_MEMORY_NON_CONSISTENT flag

2020-06-23T11:28:17+00:00

By setting or clearing V4L2_FLAG_MEMORY_NON_CONSISTENT flag user-space should be able to set or clear queue's NON_CONSISTENT ->dma_attrs. Queue's ->dma_attrs are passed to the underlying allocator in __vb2_buf_mem_alloc(), so thus user-space is able to request vb2 buffer's memory to be either consistent (coherent) or non-consistent. The patch set also adds a corresponding capability flag: fill_buf_caps() reports V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS when queue supports user-space cache management hints. Note, however, that MMAP_CACHE_HINTS capability only valid when the queue is used for memory MMAP-ed streaming I/O. Signed-off-by: Sergey Senozhatsky Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab

media: vidioc-reqbufs/create-bufs.rst: fix typo

2020-04-29T10:03:56+00:00

any others capabilities -> any other capabilities Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab