The additional flushes for gen7 appear to have been a red herring as the
more efficacious workaround seems to be commit 476af9c26063 ("drm/i915/gen6:
Flush RING_IMR changes before changing the global GT IMR"). Trusting the
updated results means we can remove the special casing for gen7_xcs and
reduce it to the gen6_xcs_emit_breadcrumb.
References: 476af9c26063 ("drm/i915/gen6: Flush RING_IMR changes before changing the global GT IMR")
Fixes: 1212bd821de8 ("drm/i915/ringbuffer: Move irq seqno barrier to the GPU for gen7")
Testcase: igt/gem_sync
Testcase: igt/gem_exec_whisper
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_ringbuffer.c | 54 ++++---------------------
1 file changed, 8 insertions(+), 46 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 3d5d6b908148..2ac0c3a0d473 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -433,8 +433,8 @@ static const int gen7_rcs_emit_breadcrumb_sz = 6;
static void gen6_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
{
- *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW;
- *cs++ = intel_hws_seqno_address(rq->engine) | MI_FLUSH_DW_USE_GTT;
+ *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW | MI_FLUSH_DW_STORE_INDEX;
+ *cs++ = I915_GEM_HWS_INDEX_ADDR | MI_FLUSH_DW_USE_GTT;
*cs++ = rq->global_seqno;
*cs++ = MI_USER_INTERRUPT;
@@ -443,34 +443,6 @@ static void gen6_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
}
static const int gen6_xcs_emit_breadcrumb_sz = 4;
-#define GEN7_XCS_WA 32
-static void gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
-{
- int i;
-
- *cs++ = MI_FLUSH_DW | MI_FLUSH_DW_OP_STOREDW;
- *cs++ = intel_hws_seqno_address(rq->engine) | MI_FLUSH_DW_USE_GTT;
- *cs++ = rq->global_seqno;
-
- for (i = 0; i < GEN7_XCS_WA; i++) {
- *cs++ = MI_STORE_DWORD_INDEX;
- *cs++ = I915_GEM_HWS_INDEX_ADDR;
- *cs++ = rq->global_seqno;
- }
-
- *cs++ = MI_FLUSH_DW;
- *cs++ = 0;
- *cs++ = 0;
-
- *cs++ = MI_USER_INTERRUPT;
- *cs++ = MI_NOOP;
-
- rq->tail = intel_ring_offset(rq, cs);
- assert_ring_tail_valid(rq->ring, rq->tail);
-}
-static const int gen7_xcs_emit_breadcrumb_sz = 8 + GEN7_XCS_WA * 3;
-#undef GEN7_XCS_WA
-
static void set_hwstam(struct intel_engine_cs *engine, u32 mask)
{
/*
@@ -2267,13 +2239,8 @@ int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine)
engine->emit_flush = gen6_bsd_ring_flush;
engine->irq_enable_mask = GT_BSD_USER_INTERRUPT;
- if (IS_GEN(dev_priv, 6)) {
- engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
- engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
- } else {
- engine->emit_breadcrumb = gen7_xcs_emit_breadcrumb;
- engine->emit_breadcrumb_sz = gen7_xcs_emit_breadcrumb_sz;
- }
+ engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
+ engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
} else {
engine->emit_flush = bsd_ring_flush;
if (IS_GEN(dev_priv, 5))
@@ -2296,13 +2263,8 @@ int intel_init_blt_ring_buffer(struct intel_engine_cs *engine)
engine->emit_flush = gen6_ring_flush;
engine->irq_enable_mask = GT_BLT_USER_INTERRUPT;
- if (IS_GEN(dev_priv, 6)) {
- engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
- engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
- } else {
- engine->emit_breadcrumb = gen7_xcs_emit_breadcrumb;
- engine->emit_breadcrumb_sz = gen7_xcs_emit_breadcrumb_sz;
- }
+ engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
+ engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
return intel_init_ring_buffer(engine);
}
@@ -2320,8 +2282,8 @@ int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
engine->irq_enable = hsw_vebox_irq_enable;
engine->irq_disable = hsw_vebox_irq_disable;
- engine->emit_breadcrumb = gen7_xcs_emit_breadcrumb;
- engine->emit_breadcrumb_sz = gen7_xcs_emit_breadcrumb_sz;
+ engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
+ engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
return intel_init_ring_buffer(engine);
}
--
2.20.1
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