From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Matthew Auld Date: Wed, 28 Jul 2021 11:30:31 +0100 Message-Id: <20210728103041.1669985-1-matthew.auld@intel.com> MIME-Version: 1.0 Subject: [igt-dev] [PATCH i-g-t v2 01/11] lib/i915/gem_mman: add FIXED mmap mode List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" To: igt-dev@lists.freedesktop.org Cc: intel-gfx@lists.freedesktop.org List-ID: We need this for discrete. Signed-off-by: Matthew Auld Cc: Maarten Lankhorst Cc: Ashutosh Dixit Cc: Daniel Vetter Cc: Ramalingam C --- lib/i915/gem_mman.c | 37 +++++++++++++++++++++++++++++++++++++ lib/i915/gem_mman.h | 4 ++++ 2 files changed, 41 insertions(+) diff --git a/lib/i915/gem_mman.c b/lib/i915/gem_mman.c index 4b4f2114..e2514f0c 100644 --- a/lib/i915/gem_mman.c +++ b/lib/i915/gem_mman.c @@ -497,6 +497,43 @@ void *gem_mmap_offset__cpu(int fd, uint32_t handle, uint64_t offset, return ptr; } +#define LOCAL_I915_MMAP_OFFSET_FIXED 4 + +void *__gem_mmap_offset__fixed(int fd, uint32_t handle, uint64_t offset, + uint64_t size, unsigned prot) +{ + return __gem_mmap_offset(fd, handle, offset, size, prot, + LOCAL_I915_MMAP_OFFSET_FIXED); +} + +/** + * gem_mmap_offset__fixed: Used to mmap objects on discrete platforms + * @fd: open i915 drm file descriptor + * @handle: gem buffer object handle + * @offset: offset in the gem buffer of the mmap arena + * @size: size of the mmap arena + * @prot: memory protection bits as used by mmap() + * + * Like __gem_mmap_offset__fixed() except we assert on failure. + * + * For discrete the caching attributes for the pages are fixed at allocation + * time, and can't be changed. The FIXED mode will simply use the same caching * + * mode of the allocated pages. This mode will always be coherent with GPU + * access. + * + * On non-discrete platforms this mode is not supported. + * + * Returns: A pointer to the created memory mapping + */ +void *gem_mmap_offset__fixed(int fd, uint32_t handle, uint64_t offset, + uint64_t size, unsigned prot) +{ + void *ptr = __gem_mmap_offset__fixed(fd, handle, offset, size, prot); + + igt_assert(ptr); + return ptr; +} + /** * __gem_mmap__cpu_coherent: * @fd: open i915 drm file descriptor diff --git a/lib/i915/gem_mman.h b/lib/i915/gem_mman.h index 5695d2ad..290c997d 100644 --- a/lib/i915/gem_mman.h +++ b/lib/i915/gem_mman.h @@ -37,6 +37,8 @@ bool gem_mmap_offset__has_wc(int fd); void *gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot); void *gem_mmap_offset__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot); +void *gem_mmap_offset__fixed(int fd, uint32_t handle, uint64_t offset, + uint64_t size, unsigned prot); void *gem_mmap__device_coherent(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot); void *gem_mmap__cpu_coherent(int fd, uint32_t handle, uint64_t offset, @@ -54,6 +56,8 @@ void *__gem_mmap_offset__cpu(int fd, uint32_t handle, uint64_t offset, void *__gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot); void *__gem_mmap_offset__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot); +void *__gem_mmap_offset__fixed(int fd, uint32_t handle, uint64_t offset, + uint64_t size, unsigned prot); void *__gem_mmap__device_coherent(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot); void *__gem_mmap_offset(int fd, uint32_t handle, uint64_t offset, uint64_t size, -- 2.26.3 _______________________________________________ igt-dev mailing list igt-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/igt-dev