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linux/drivers/media/v4l2-core
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Dan Williams b70131de64 v4l2: disable filesystem-dax mapping support 
V4L2 memory registrations are incompatible with filesystem-dax that
needs the ability to revoke dma access to a mapping at will, or
otherwise allow the kernel to wait for completion of DMA.  The
filesystem-dax implementation breaks the traditional solution of
truncate of active file backed mappings since there is no page-cache
page we can orphan to sustain ongoing DMA.

If v4l2 wants to support long lived DMA mappings it needs to arrange to
hold a file lease or use some other mechanism so that the kernel can
coordinate revoking DMA access when the filesystem needs to truncate
mappings.

Link: http://lkml.kernel.org/r/151068940499.7446.12846708245365671207.stgit@dwillia2-desk3.amr.corp.intel.com
Fixes: 3565fce3a6 ("mm, x86: get_user_pages() for dax mappings")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Hal Rosenstock <hal.rosenstock@gmail.com>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Sean Hefty <sean.hefty@intel.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-29 18:40:42 -08:00
..
Kconfig [media] v4l: fwnode: Support generic fwnode for parsing standardised properties 2017-06-06 09:25:16 -03:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tuner-core.c media: tuner-core: Remove unused #define PREFIX 2017-06-24 09:37:01 -03:00
v4l2-async.c media: v4l: async: fix unregister for implicitly registered sub-device notifiers 2017-11-07 03:07:20 -05:00
v4l2-clk.c media: Convert to using %pOF instead of full_name 2017-08-20 08:20:20 -04:00
v4l2-common.c
v4l2-compat-ioctl32.c media: v4l2-compat-ioctl32.c: add capabilities field to, v4l2_input32 2017-08-20 08:11:55 -04:00
v4l2-ctrls.c media: v4l2-ctrls: Don't validate BITMASK twice 2017-11-07 05:52:24 -05:00
v4l2-dev.c
v4l2-device.c
v4l2-dv-timings.c
v4l2-event.c [media] v4l2-core: Use kvmalloc() for potentially big allocations 2017-06-20 09:11:48 -03:00
v4l2-fh.c
v4l2-flash-led-class.c media: v4l2-flash-led-class: Create separate sub-devices for indicators 2017-08-26 20:26:35 -04:00
v4l2-fwnode.c media: v4l2-fwnode: use the cached value instead of getting again 2017-11-01 05:10:36 -04:00
v4l2-ioctl.c media: v4l-ioctl: Fix typo on v4l_print_frmsizeenum 2017-09-23 14:56:23 -04:00
v4l2-mc.c
v4l2-mem2mem.c [media] media: v4l2-mem2mem: extend m2m APIs for more accurate buffer management 2017-06-20 08:53:39 -03:00
v4l2-subdev.c [media] v4l2-core: Use kvmalloc() for potentially big allocations 2017-06-20 09:11:48 -03:00
v4l2-trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vb2-trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
videobuf-core.c
videobuf-dma-contig.c
videobuf-dma-sg.c v4l2: disable filesystem-dax mapping support 2017-11-29 18:40:42 -08:00
videobuf-dvb.c
videobuf-vmalloc.c
videobuf2-core.c media: vb2: add bidirectional flag in vb2_queue 2017-08-26 14:15:54 -04:00
videobuf2-dma-contig.c Merge drm-upstream/drm-next into drm-intel-next-queued 2017-09-28 15:56:49 +03:00
videobuf2-dma-sg.c media: vb2: add bidirectional flag in vb2_queue 2017-08-26 14:15:54 -04:00
videobuf2-dvb.c
videobuf2-memops.c
videobuf2-v4l2.c
videobuf2-vmalloc.c media: vb2: add bidirectional flag in vb2_queue 2017-08-26 14:15:54 -04:00