Prefer CPU WC mmaps via our new mmap offset plumbing otherwise fall-
back to GTT mmaps when hw doesn't support PAT
Signed-off-by: Abdiel Janulgue <abdiel.janul...@linux.intel.com>
Cc: Matthew Auld <matthew.a...@intel.com>
Acked-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 18 ++++++++++++++++++
drivers/gpu/drm/i915/gem/i915_gem_mman.h | 2 ++
drivers/gpu/drm/i915/i915_drv.c | 1 +
3 files changed, 21 insertions(+)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index bb05c53c03c8..3913634ab717 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -540,6 +540,24 @@ __assign_gem_object_mmap_data(struct drm_file *file,
return ret;
}
+int
+i915_gem_mmap_dumb(struct drm_file *file,
+ struct drm_device *dev,
+ u32 handle,
+ u64 *offset)
+{
+ enum i915_mmap_type mmap_type;
+
+ if (boot_cpu_has(X86_FEATURE_PAT))
+ mmap_type = I915_MMAP_TYPE_WC;
+ else if (!i915_ggtt_has_aperture(&to_i915(dev)->ggtt))
+ return -ENODEV;
+ else
+ mmap_type = I915_MMAP_TYPE_GTT;
+
+ return __assign_gem_object_mmap_data(file, handle, mmap_type, offset);
+}
+
/**
* i915_gem_mmap_offset_ioctl - prepare an object for GTT mmap'ing
* @dev: DRM device
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.h
b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
index 4d3b493e853a..6e70b91dabc4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
@@ -24,6 +24,8 @@ void i915_mmap_offset_destroy(struct i915_mmap_offset *mmo,
struct mutex *mutex)
void __i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj);
void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj);
void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj);
+int i915_gem_mmap_dumb(struct drm_file *file_priv, struct drm_device *dev,
+ u32 handle, u64 *offset);
int i915_gem_mmap_gtt_version(void);
#endif
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index ac6d4470ce75..f7db0bbbe302 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2767,6 +2767,7 @@ static struct drm_driver driver = {
.get_scanout_position = i915_get_crtc_scanoutpos,
.dumb_create = i915_gem_dumb_create,
+ .dumb_map_offset = i915_gem_mmap_dumb,
.ioctls = i915_ioctls,
.num_ioctls = ARRAY_SIZE(i915_ioctls),
.fops = &i915_driver_fops,
--
2.23.0
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