diff options
| author | Imre Deak <imre.deak@intel.com> | 2021-01-21 00:38:34 +0300 |
|---|---|---|
| committer | Imre Deak <imre.deak@intel.com> | 2021-01-22 16:59:35 +0300 |
| commit | 5fbc2c2bfa5c9daf885e51038e66645916e83966 (patch) | |
| tree | 7d3a54ed995049e0c4d378a61e6e3f962b03ba0d /drivers/gpu/drm/i915/gem/i915_gem_object.h | |
| parent | 87199e4c2490ab4ba0483a5ae5690c19b5c3d45b (diff) | |
| download | linux-5fbc2c2bfa5c9daf885e51038e66645916e83966.tar.xz | |
drm/i915/gem: Add a helper to read data from a GEM object page
Add a simple helper to read data with the CPU from the page of a GEM
object. Do the read either via a kmap if the object has struct pages
or an iomap otherwise. This is needed by the next patch, reading a u64
value from the object (w/o requiring the obj to be mapped to the GPU).
Suggested by Chris.
v2 (Chris):
- Sanitize the type and order of func params.
- Avoid consts requiring too many casts.
- Use BUG_ON instead of WARN_ON, simplify the conditions.
- Fix __iomem sparse errors.
- Leave locking/syncing/pinning up to the caller, require only that the
caller has pinned the object pages.
- Check for iomem backing store before reading via an iomap.
v3:
- Fix offset passed to io_mapping_map_wc() missing a mem.region.start
delta. (Chris, Matthew)
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210120213834.1435710-1-imre.deak@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/gem/i915_gem_object.h')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_object.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h index be14486f63a7..ae83737f1d48 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h @@ -201,6 +201,12 @@ i915_gem_object_has_struct_page(const struct drm_i915_gem_object *obj) } static inline bool +i915_gem_object_has_iomem(const struct drm_i915_gem_object *obj) +{ + return i915_gem_object_type_has(obj, I915_GEM_OBJECT_HAS_IOMEM); +} + +static inline bool i915_gem_object_is_shrinkable(const struct drm_i915_gem_object *obj) { return i915_gem_object_type_has(obj, I915_GEM_OBJECT_IS_SHRINKABLE); @@ -540,4 +546,6 @@ i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, __i915_gem_object_invalidate_frontbuffer(obj, origin); } +int i915_gem_object_read_from_page(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size); + #endif |