lib/i915/gem_mman: add helper query for has_device_coherent

Might be useful in some tests, where we are not explicitly testing WC
maps, but rather just require something that is "device coherent", which
should also play nice on discrete platforms.

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

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/i915/gem_mman.h b/lib/i915/gem_mman.h
index 290c997d..5966ddb5 100644
--- a/lib/i915/gem_mman.h
+++ b/lib/i915/gem_mman.h
@@ -41,6 +41,7 @@ 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);
+bool gem_mmap__has_device_coherent(int fd);
 void *gem_mmap__cpu_coherent(int fd, uint32_t handle, uint64_t offset,
 			     uint64_t size, unsigned prot);
 
@@ -96,6 +97,16 @@ int gem_munmap(void *ptr, uint64_t size);
  */
 #define gem_require_mmap_offset_wc(fd) igt_require(gem_mmap_offset__has_wc(fd))
 
+/**
+ * gem_require_mmap_offset_device_coherent:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether direct (i.e. cpu access path, bypassing
+ * the gtt) write-combine memory mappings are available, or fixed mapping for
+ * discrete. Automatically skips through igt_require() if not.
+ */
+#define gem_require_mmap_device_coherent(fd) igt_require(gem_mmap__has_device_coherent(fd))
+
 extern const struct mmap_offset {
 	const char *name;
 	unsigned int type;