The Vulkan driver in Mesa for Intel hardware never uses relocations if it's running on a version of i915 that supports at least softpin which all versions of i915 supporting Gen12 do. On the OpenGL side, Gen12+ is only supported by iris which never uses relocations. The older i965 driver in Mesa does use relocations but it only supports Intel hardware through Gen11 and has been deprecated for all hardware Gen9+. The compute driver also never uses relocations. This only leaves the media driver which is supposed to be switching to softpin going forward. Making softpin a requirement for all future hardware seems reasonable.
There is one piece of hardware enabled by default in i915: RKL which was enabled by e22fa6f0a976 which has not yet landed in drm-next so this almost but not really a userspace API change for RKL. If it becomes a problem, we can always add !IS_ROCKETLAKE(eb->i915) to the condition.
Rejecting relocations starting with newer Gen12 platforms has the benefit that we don't have to bother supporting it on platforms with local memory. Given how much CPU touching of memory is required for relocations, not having to do so on platforms where not all memory is directly CPU-accessible carries significant advantages.
v2 (Jason Ekstrand): - Allow TGL-LP platforms as they've already shipped
v3 (Jason Ekstrand): - WARN_ON platforms with LMEM support in case the check is wrong
v4 (Jason Ekstrand): - Call out Rocket Lake in the commit message
v5 (Jason Ekstrand): - Drop the HAS_LMEM check as it's already covered by the version check
v6 (Jason Ekstrand): - Move the check to eb_validate_vma() with all the other exec_object validation checks.
Signed-off-by: Jason Ekstrand jason@jlekstrand.net Reviewed-by: Zbigniew Kempczyński zbigniew.kempczynski@intel.com Reviewed-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com --- drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 99772f37bff60..c082fb0bef330 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -483,6 +483,13 @@ eb_validate_vma(struct i915_execbuffer *eb, struct drm_i915_gem_exec_object2 *entry, struct i915_vma *vma) { + /* Relocations are disallowed for all platforms after TGL-LP. This + * also covers all platforms with local memory. + */ + if (entry->relocation_count && + INTEL_GEN(eb->i915) >= 12 && !IS_TIGERLAKE(eb->i915)) + return -EINVAL; + if (unlikely(entry->flags & eb->invalid_flags)) return -EINVAL;