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| author | Akash Goel <akash.goel@intel.com> | 2014-06-17 09:29:42 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-06-17 11:21:47 +0400 |
| commit | 24f3a8cf7766e52a087904b4346794c7b410f957 (patch) | |
| tree | b3aae1632b0a7acfdac0e1c4272b19cd25c77a69 /drivers/gpu/drm/i915/intel_ringbuffer.c | |
| parent | 5aa8a937730940b48b70b21e05cf03e4cea31058 (diff) | |
| download | linux-24f3a8cf7766e52a087904b4346794c7b410f957.tar.xz | |
drm/i915: Added write-enable pte bit supportt
This adds support for a write-enable bit in the entry of GTT.
This is handled via a read-only flag in the GEM buffer object which
is then used to see how to set the bit when writing the GTT entries.
Currently by default the Batch buffer & Ring buffers are marked as read only.
v2: Moved the pte override code for read-only bit to 'byt_pte_encode'. (Chris)
Fixed the issue of leaving 'gt_old_ro' as unused. (Chris)
v3: Removed the 'gt_old_ro' field, now setting RO bit only for Ring Buffers(Daniel).
v4: Added a new 'flags' parameter to all the pte(gen6) encode & insert_entries functions,
in lieu of overloading the cache_level enum (Daniel).
v5: Removed the superfluous VLV check & changed the definition location of PTE_READ_ONLY flag (Imre)
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Akash Goel <akash.goel@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 0eaaaec78bae..b96edaf905de 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1397,6 +1397,9 @@ static int allocate_ring_buffer(struct intel_engine_cs *ring) if (obj == NULL) return -ENOMEM; + /* mark ring buffers as read-only from GPU side by default */ + obj->gt_ro = 1; + ret = i915_gem_obj_ggtt_pin(obj, PAGE_SIZE, PIN_MAPPABLE); if (ret) goto err_unref; |