[PATCH] drm/i915: avoid concurrent writes to aux_inv
fei.yang at intel.com
fei.yang at intel.com
Fri Mar 4 22:14:07 UTC 2022
From: Fei Yang <fei.yang at intel.com>
GPU hangs have been observed when multiple engines write to the
same aux_inv register at the same time. To avoid this each engine
should only invalidate its own auxiliary table. The function
gen12_emit_flush_xcs() currently invalidate the auxiliary table for
all engines because the rq->engine is not necessarily the engine
eventually carrying out the request, and potentially the engine
could even be a virtual one (with engine->instance being -1).
With this patch, auxiliary table invalidation is done only for the
engine executing the request. And the mmio address for the aux_inv
register is set after the engine instance becomes certain.
Signed-off-by: Chris Wilson <chris.p.wilson at intel.com>
Signed-off-by: Fei Yang <fei.yang at intel.com>
---
drivers/gpu/drm/i915/gt/gen2_engine_cs.c | 9 +++
drivers/gpu/drm/i915/gt/gen6_engine_cs.c | 9 +++
drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 61 ++++++++-----------
.../drm/i915/gt/intel_execlists_submission.c | 35 +++++++++++
drivers/gpu/drm/i915/i915_request.h | 2 +
5 files changed, 82 insertions(+), 34 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/gen2_engine_cs.c b/drivers/gpu/drm/i915/gt/gen2_engine_cs.c
index 1c82caf525c3..0ec4986e4805 100644
--- a/drivers/gpu/drm/i915/gt/gen2_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen2_engine_cs.c
@@ -37,6 +37,9 @@ int gen2_emit_flush(struct i915_request *rq, u32 mode)
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen2 */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -123,6 +126,9 @@ int gen4_emit_flush_rcs(struct i915_request *rq, u32 mode)
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen4 rcs */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -138,6 +144,9 @@ int gen4_emit_flush_vcs(struct i915_request *rq, u32 mode)
*cs++ = MI_NOOP;
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen4 vcs */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/gt/gen6_engine_cs.c b/drivers/gpu/drm/i915/gt/gen6_engine_cs.c
index 5e65550b4dfb..efe51c4662fe 100644
--- a/drivers/gpu/drm/i915/gt/gen6_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen6_engine_cs.c
@@ -137,6 +137,9 @@ int gen6_emit_flush_rcs(struct i915_request *rq, u32 mode)
*cs++ = 0;
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen6 */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -208,6 +211,9 @@ static int mi_flush_dw(struct i915_request *rq, u32 flags)
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen6 */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -347,6 +353,9 @@ int gen7_emit_flush_rcs(struct i915_request *rq, u32 mode)
*cs++ = 0;
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen7 rcs */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index b1b9c3fd7bf9..b6374cf53314 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -73,6 +73,9 @@ int gen8_emit_flush_rcs(struct i915_request *rq, u32 mode)
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen8 rcs */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -106,6 +109,9 @@ int gen8_emit_flush_xcs(struct i915_request *rq, u32 mode)
*cs++ = 0; /* value */
intel_ring_advance(rq, cs);
+ /* hsdes: 1809175790. No fixup needed for gen8 xcs */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -157,6 +163,9 @@ int gen11_emit_flush_rcs(struct i915_request *rq, u32 mode)
intel_ring_advance(rq, cs);
}
+ /* hsdes: 1809175790. No fixup needed for gen11 rcs */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -165,30 +174,6 @@ static u32 preparser_disable(bool state)
return MI_ARB_CHECK | 1 << 8 | state;
}
-static i915_reg_t aux_inv_reg(const struct intel_engine_cs *engine)
-{
- static const i915_reg_t vd[] = {
- GEN12_VD0_AUX_NV,
- GEN12_VD1_AUX_NV,
- GEN12_VD2_AUX_NV,
- GEN12_VD3_AUX_NV,
- };
-
- static const i915_reg_t ve[] = {
- GEN12_VE0_AUX_NV,
- GEN12_VE1_AUX_NV,
- };
-
- if (engine->class == VIDEO_DECODE_CLASS)
- return vd[engine->instance];
-
- if (engine->class == VIDEO_ENHANCEMENT_CLASS)
- return ve[engine->instance];
-
- GEM_BUG_ON("unknown aux_inv reg\n");
- return INVALID_MMIO_REG;
-}
-
static u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs)
{
*cs++ = MI_LOAD_REGISTER_IMM(1);
@@ -274,6 +259,9 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
intel_ring_advance(rq, cs);
}
+ /* hsdes: 1809175790. aux_inv has been done above, no fixup needed */
+ rq->aux_inv_fixup = NULL;
+
return 0;
}
@@ -288,7 +276,7 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
if (mode & EMIT_INVALIDATE)
aux_inv = rq->engine->mask & ~BIT(BCS0);
if (aux_inv)
- cmd += 2 * hweight32(aux_inv) + 2;
+ cmd += 4;
cs = intel_ring_begin(rq, cmd);
if (IS_ERR(cs))
@@ -319,16 +307,21 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
*cs++ = 0; /* value */
if (aux_inv) { /* hsdes: 1809175790 */
- struct intel_engine_cs *engine;
- unsigned int tmp;
-
- *cs++ = MI_LOAD_REGISTER_IMM(hweight32(aux_inv));
- for_each_engine_masked(engine, rq->engine->gt, aux_inv, tmp) {
- *cs++ = i915_mmio_reg_offset(aux_inv_reg(engine));
- *cs++ = AUX_INV;
- }
+ /*
+ * We don't know which engine will eventually carry out
+ * this request, so the mmio aux_inv register address is
+ * unknown at this moment. We save the cs pointer supposed
+ * to hold the aux_inv address in rq->aux_inv_fixup and set
+ * it in execlists_dequeue() when the engine instance
+ * carrying out this request becomes certain
+ */
+ *cs++ = MI_LOAD_REGISTER_IMM(1);
+ rq->aux_inv_fixup = cs; /* save the pointer to aux_inv */
+ *cs++ = 0; /* mmio addr to be set at submission to HW */
+ *cs++ = AUX_INV;
*cs++ = MI_NOOP;
- }
+ } else
+ rq->aux_inv_fixup = NULL;
if (mode & EMIT_INVALIDATE)
*cs++ = preparser_disable(false);
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index e1470bb60f34..7e8552414275 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -1258,6 +1258,34 @@ static bool completed(const struct i915_request *rq)
return __i915_request_is_complete(rq);
}
+static i915_reg_t aux_inv_reg(const struct intel_engine_cs *engine)
+{
+ static const i915_reg_t vd[] = {
+ GEN12_VD0_AUX_NV,
+ GEN12_VD1_AUX_NV,
+ GEN12_VD2_AUX_NV,
+ GEN12_VD3_AUX_NV,
+ };
+
+ static const i915_reg_t ve[] = {
+ GEN12_VE0_AUX_NV,
+ GEN12_VE1_AUX_NV,
+ };
+
+ if (engine->class == VIDEO_DECODE_CLASS) {
+ GEM_BUG_ON(engine->instance >= ARRAY_SIZE(vd));
+ return vd[engine->instance];
+ }
+
+ if (engine->class == VIDEO_ENHANCEMENT_CLASS) {
+ GEM_BUG_ON(engine->instance >= ARRAY_SIZE(ve));
+ return ve[engine->instance];
+ }
+
+ GEM_BUG_ON("unknown aux_inv reg\n");
+ return INVALID_MMIO_REG;
+}
+
static void execlists_dequeue(struct intel_engine_cs *engine)
{
struct intel_engine_execlists * const execlists = &engine->execlists;
@@ -1538,6 +1566,13 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
}
if (__i915_request_submit(rq)) {
+ /* hsdes: 1809175790 */
+ if (rq->aux_inv_fixup) {
+ *rq->aux_inv_fixup =
+ i915_mmio_reg_offset
+ (aux_inv_reg(engine));
+ rq->execution_mask = engine->mask;
+ }
if (!merge) {
*port++ = i915_request_get(last);
last = NULL;
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 28b1f9db5487..8e0764c43936 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -312,6 +312,8 @@ struct i915_request {
struct i915_capture_list *capture_list;
#endif
+ u32 *aux_inv_fixup; /* hsdes: 1809175790 */
+
/** Time at which this request was emitted, in jiffies. */
unsigned long emitted_jiffies;
--
2.25.1
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