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| author | Jon Bloomfield <jon.bloomfield@intel.com> | 2018-07-12 19:53:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-12 19:13:31 +0100 |
| commit | 6d0cfddc7afc715835f0e17827106f832b14dd2a (patch) | |
| tree | 5eb35f1d315864dc17ad11818ad805966cc9e5cc /drivers/gpu/drm/i915/intel_ringbuffer.c | |
| parent | b575bf8be32348bb1053141d7afb4b7a7336e7f6 (diff) | |
drm/i915/gtt: Add read only pages to gen8_pte_encode
commit 25dda4dabeeb12af5209b0183c788ef2a88dabbe upstream.
We can set a bit inside the ppGTT PTE to indicate a page is read-only;
writes from the GPU will be discarded. We can use this to protect pages
and in particular support read-only userptr mappings (necessary for
importing PROT_READ vma).
Signed-off-by: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180712185315.3288-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
0 files changed, 0 insertions, 0 deletions