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drm/i915: Use MI_BATCH_BUFFER_START on 830/845 

MI_BATCH_BUFFER is nasty since it requires that userspace pass in the
correct batch length.

Let's switch to using MI_BATCH_BUFFER_START instead (like we do on
other platforms). Then we don't have to specify the batch length
at all, and the CS will instead execute until it sees the
MI_BATCH_BUFFER_END.

We still need the batch length since we do the CS TLB workaround
and copy the batch into the permanently pinned scratch object
and execute it from there. But for this we can simply use the
batch object length when the user hasn't specified the actual
batch length. So specifying the batch length becomes just a
way to optimize the batch copy a little bit.

We lost batch_len from a bunch of igts (including the quiesce batch)
so without this igt is utterly broken on 830/845. Also some igts such
as gem_cpu_reloc never specified the batch_len and so didn't work.
With MI_BATCH_BUFFER_START we don't have to fix up igt every time
someone forgets that 830/845 exist.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1450110229-30450-11-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Ville Syrjälä 2015-12-14 18:23:49 +02:00
parent 7244f309b0
commit 9d611c033b
2 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -1309,6 +1309,9 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
exec_start = params->batch_obj_vm_offset +
params->args_batch_start_offset;
if (exec_len == 0)
exec_len = params->batch_obj->base.size;
ret = ring->dispatch_execbuffer(params->request,
exec_start, exec_len,
params->dispatch_flags);

6
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -1865,15 +1865,13 @@ i830_dispatch_execbuffer(struct drm_i915_gem_request *req,
offset = cs_offset;
}
ret = intel_ring_begin(req, 4);
ret = intel_ring_begin(req, 2);
if (ret)
return ret;
intel_ring_emit(ring, MI_BATCH_BUFFER);
intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_GTT);
intel_ring_emit(ring, offset | (dispatch_flags & I915_DISPATCH_SECURE ?
0 : MI_BATCH_NON_SECURE));
intel_ring_emit(ring, offset + len - 8);
intel_ring_emit(ring, MI_NOOP);
intel_ring_advance(ring);
return 0;