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i965: Emit Ivybridge VS workaround flushes.

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I recently discovered this text in the BSpec.  It seems wise to comply,
though I haven't observed it to fix anything yet.

Fixes a regression in glean/fbo since 28cfa1fa21.

NOTE: This is a candidate for stable release branches.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45221
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 709f50928e)
This commit is contained in:
Kenneth Graunke 2012-01-19 09:55:34 -08:00
parent 0aadb240e1
commit e3943cf1cc
4 changed files with 29 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/mesa/drivers/dri/i965/gen7_urb.c
View file

@ -99,6 +99,8 @@ gen7_upload_urb(struct brw_context *brw)
/* GS requirement */
assert(!brw->gs.prog_active);
gen7_emit_vs_workaround_flush(intel);
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_URB_VS << 16 | (2 - 2));
OUT_BATCH(brw->urb.nr_vs_entries |

2
src/mesa/drivers/dri/i965/gen7_vs_state.c
View file

@ -35,6 +35,8 @@ upload_vs_state(struct brw_context *brw)
struct intel_context *intel = &brw->intel;
uint32_t floating_point_mode = 0;
gen7_emit_vs_workaround_flush(intel);
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_BINDING_TABLE_POINTERS_VS << 16 | (2 - 2));
OUT_BATCH(brw->bind.bo_offset);

26
src/mesa/drivers/dri/intel/intel_batchbuffer.c
View file

@ -57,13 +57,13 @@ intel_batchbuffer_init(struct intel_context *intel)
{
intel_batchbuffer_reset(intel);
if (intel->gen == 6) {
if (intel->gen >= 6) {
/* We can't just use brw_state_batch to get a chunk of space for
* the gen6 workaround because it involves actually writing to
* the buffer, and the kernel doesn't let us write to the batch.
*/
intel->batch.workaround_bo = drm_intel_bo_alloc(intel->bufmgr,
"gen6 workaround",
"pipe_control workaround",
4096, 4096);
}
}
@ -363,6 +363,28 @@ intel_emit_depth_stall_flushes(struct intel_context *intel)
ADVANCE_BATCH();
}
/**
* From the BSpec, volume 2a.03: VS Stage Input / State:
* "[DevIVB] A PIPE_CONTROL with Post-Sync Operation set to 1h and a depth
* stall needs to be sent just prior to any 3DSTATE_VS, 3DSTATE_URB_VS,
* 3DSTATE_CONSTANT_VS, 3DSTATE_BINDING_TABLE_POINTER_VS,
* 3DSTATE_SAMPLER_STATE_POINTER_VS command. Only one PIPE_CONTROL needs
* to be sent before any combination of VS associated 3DSTATE."
*/
void
gen7_emit_vs_workaround_flush(struct intel_context *intel)
{
assert(intel->gen == 7);
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_PIPE_CONTROL);
OUT_BATCH(PIPE_CONTROL_DEPTH_STALL | PIPE_CONTROL_WRITE_IMMEDIATE);
OUT_RELOC(intel->batch.workaround_bo,
I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION, 0);
OUT_BATCH(0); /* write data */
ADVANCE_BATCH();
}
/**
* Emits a PIPE_CONTROL with a non-zero post-sync operation, for
* implementing two workarounds on gen6. From section 1.4.7.1

1
src/mesa/drivers/dri/intel/intel_batchbuffer.h
View file

@ -43,6 +43,7 @@ bool intel_batchbuffer_emit_reloc_fenced(struct intel_context *intel,
void intel_batchbuffer_emit_mi_flush(struct intel_context *intel);
void intel_emit_post_sync_nonzero_flush(struct intel_context *intel);
void intel_emit_depth_stall_flushes(struct intel_context *intel);
void gen7_emit_vs_workaround_flush(struct intel_context *intel);
static INLINE uint32_t float_as_int(float f)
{