linux/drivers/gpu
Andrey Konovalov d224d76f24 UPSTREAM: drm/radeon: untag user pointers in radeon_gem_userptr_ioctl
(Upstream commit 4fdfae8d8f).

This patch is a part of a series that extends kernel ABI to allow to pass
tagged user pointers (with the top byte set to something else other than
0x00) as syscall arguments.

In radeon_gem_userptr_ioctl() an MMU notifier is set up with a (tagged)
userspace pointer.  The untagged address should be used so that MMU
notifiers for the untagged address get correctly matched up with the right
BO.  This funcation also calls radeon_ttm_tt_pin_userptr(), which uses
provided user pointers for vma lookups, which can only by done with
untagged pointers.

This patch untags user pointers in radeon_gem_userptr_ioctl().

Link: http://lkml.kernel.org/r/c856babeb67195b35603b8d5ba386a2819cec5ff.1563904656.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Suggested-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Jens Wiklander <jens.wiklander@linaro.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Bug: 135692346
Change-Id: I7b33a1e1994b588c307cf5d909233de9bc0abddc
2019-10-07 15:27:41 -04:00
..
drm UPSTREAM: drm/radeon: untag user pointers in radeon_gem_userptr_ioctl 2019-10-07 15:27:41 -04:00
host1x gpu: host1x: Increase maximum DMA segment size 2019-07-31 07:26:59 +02:00
ipu-v3 gpu: ipu-v3: ipu-ic: Fix saturation bit offset in TPMEM 2019-07-26 09:14:29 +02:00
vga vga_switcheroo: Fix missing gpu_bound call at audio client registration 2018-11-13 11:09:00 -08:00
Makefile