From: Fei Yang <fei.y...@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.wil...@intel.com>
Signed-off-by: Fei Yang <fei.y...@intel.com>
---
drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 38 +++----------------
.../drm/i915/gt/intel_execlists_submission.c | 38 +++++++++++++++++++
drivers/gpu/drm/i915/i915_request.h | 2 +
3 files changed, 45 insertions(+), 33 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index 1f8cf4f790b2..9e39d04f46cc 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -165,30 +165,6 @@ 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);
@@ -280,7 +256,7 @@ 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))
@@ -311,14 +287,10 @@ 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;
- }
+ *cs++ = MI_LOAD_REGISTER_IMM(1);
+ rq->vd_ve_aux_inv = cs;
+ *cs++ = 0; /* address to be set at submission to HW */
+ *cs++ = AUX_INV;
*cs++ = MI_NOOP;
}
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 961d795220a3..f56726c861b7 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -1253,6 +1253,34 @@ 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;
@@ -1533,6 +1561,16 @@ static void execlists_dequeue(struct intel_engine_cs
*engine)
}
if (__i915_request_submit(rq)) {
+ /* hsdes: 1809175790 */
+ if (rq->vd_ve_aux_inv &&
+ (engine->class == VIDEO_DECODE_CLASS ||
+ engine->class == VIDEO_ENHANCEMENT_CLASS))
{
+ *rq->vd_ve_aux_inv =
+ i915_mmio_reg_offset(
+ aux_inv_reg(engine));
+ rq->vd_ve_aux_inv = NULL;
+ 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..69de32e5e15d 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -350,6 +350,8 @@ struct i915_request {
struct list_head link;
unsigned long delay;
} mock;)
+
+ u32 *vd_ve_aux_inv;
};
#define I915_FENCE_GFP (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
--
2.25.1
