From: Ashutosh Dixit ashutosh.dixit@intel.com
The rationale for this change is roughly as follows:
1. The functionality can be done entirely in userspace with a combination of mmap + memcpy
2. The only reason anyone in userspace is still using it is because someone implemented bo_subdata that way in libdrm ages ago and they're all too lazy to write the 5 lines of code to do a map.
3. This falls cleanly into the category of things which will only get more painful with local memory support.
These ioctls aren't used much anymore by "real" userspace drivers. Vulkan has never used them and neither has the iris GL driver. The old i965 GL driver does use PWRITE for glBufferSubData but it only supports up through Gen11; Gen12 was never enabled in i965. The compute driver has never used PREAD/PWRITE. The only remaining user is the media driver which uses it exactly twice and they're easily removed [1] so expecting them to drop it going forward is reasonable.
IGT changes which handle this kernel change have also been submitted [2].
[1] https://github.com/intel/media-driver/pull/1160 [2] https://patchwork.freedesktop.org/series/81384/
v2 (Jason Ekstrand): - Improved commit message with the status of all usermode drivers - A more future-proof platform check
v3 (Jason Ekstrand): - Drop the HAS_LMEM checks as they're already covered by the version checks
Signed-off-by: Ashutosh Dixit ashutosh.dixit@intel.com Signed-off-by: Jason Ekstrand jason@jlekstrand.net Reviewed-by: Jason Ekstrand jason@jlekstrand.net --- drivers/gpu/drm/i915/i915_gem.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index b2e3b5cfccb4a..80915467e0d84 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -374,10 +374,17 @@ int i915_gem_pread_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { + struct drm_i915_private *i915 = to_i915(dev); struct drm_i915_gem_pread *args = data; struct drm_i915_gem_object *obj; int ret;
+ /* PREAD is disallowed for all platforms after TGL-LP. This also + * covers all platforms with local memory. + */ + if (INTEL_GEN(i915) >= 12 && !IS_TIGERLAKE(i915)) + return -EOPNOTSUPP; + if (args->size == 0) return 0;
@@ -675,10 +682,17 @@ int i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { + struct drm_i915_private *i915 = to_i915(dev); struct drm_i915_gem_pwrite *args = data; struct drm_i915_gem_object *obj; int ret;
+ /* PWRITE is disallowed for all platforms after TGL-LP. This also + * covers all platforms with local memory. + */ + if (INTEL_GEN(i915) >= 12 && !IS_TIGERLAKE(i915)) + return -EOPNOTSUPP; + if (args->size == 0) return 0;