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From: Matthew Auld <matthew.auld@intel.com>
To: igt-dev@lists.freedesktop.org
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>, intel-gfx@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH i-g-t 1/7] lib/i915/gem_mman: add FIXED mmap mode
Date: Mon, 26 Jul 2021 13:03:04 +0100	[thread overview]
Message-ID: <20210726120310.1115522-1-matthew.auld@intel.com> (raw)

We need this for discrete.

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Ramalingam C <ramalingam.c@intel.com>
---
 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

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             reply	other threads:[~2021-07-26 12:04 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26 12:03 Matthew Auld [this message]
2021-07-26 12:03 ` [Intel-gfx] [PATCH i-g-t 2/7] lib/i915/gem_mman: add fixed mode to mmap__device_coherent Matthew Auld
2021-07-26 12:03 ` [Intel-gfx] [PATCH i-g-t 3/7] lib/i915/gem_mman: add fixed mode to mmap__cpu_coherent Matthew Auld
2021-07-26 12:03 ` [Intel-gfx] [PATCH i-g-t 4/7] lib/i915/gem_mman: update mmap_offset_types with FIXED Matthew Auld
2021-07-26 12:03 ` [Intel-gfx] [PATCH i-g-t 5/7] lib/ioctl_wrappers: update mmap_{read, write} for discrete Matthew Auld
2021-07-27 21:51   ` Dixit, Ashutosh
2021-07-26 12:03 ` [Intel-gfx] [PATCH i-g-t 6/7] lib/ioctl_wrappers: update set_domain " Matthew Auld
2021-07-26 12:03 ` [Intel-gfx] [PATCH i-g-t 7/7] tests/i915/module_load: update " Matthew Auld
2021-07-28  2:01 ` [Intel-gfx] [igt-dev] [PATCH i-g-t 1/7] lib/i915/gem_mman: add FIXED mmap mode Dixit, Ashutosh
2021-07-28  5:12   ` Dixit, Ashutosh
2021-07-28  6:08   ` Petri Latvala
2021-07-29  1:53     ` Dixit, Ashutosh
2021-07-29  8:22       ` Petri Latvala

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