Aux table invalidation can fail on update. So
next access may cause memory access to be into stale entry.
Proposed workaround is to invalidate entries between
all batchbuffers.
References bspec#43904, hsdes#1809175790
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Chuansheng Liu <chuansheng....@intel.com>
Cc: Rafael ANtognolli <rafael.antogno...@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 16 +++++++++++++++-
drivers/gpu/drm/i915/i915_reg.h | 2 ++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
b/drivers/gpu/drm/i915/gt/intel_lrc.c
index e1235d504837..bbdb0e2a4571 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -4539,6 +4539,17 @@ static u32 preparser_disable(bool state)
return MI_ARB_CHECK | 1 << 8 | state;
}
+static u32 *
+gen12_emit_aux_table_inv(struct i915_request *rq, u32 *cs)
+{
+ *cs++ = MI_LOAD_REGISTER_IMM(1);
+ *cs++ = i915_mmio_reg_offset(GEN12_GFX_CCS_AUX_NV);
+ *cs++ = AUX_INV;
+ *cs++ = MI_NOOP;
+
+ return cs;
+}
+
static int gen12_emit_flush_render(struct i915_request *request,
u32 mode)
{
@@ -4587,7 +4598,7 @@ static int gen12_emit_flush_render(struct i915_request
*request,
flags |= PIPE_CONTROL_CS_STALL;
- cs = intel_ring_begin(request, 8);
+ cs = intel_ring_begin(request, 8 + 4);
if (IS_ERR(cs))
return PTR_ERR(cs);
@@ -4600,6 +4611,9 @@ static int gen12_emit_flush_render(struct i915_request
*request,
cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
+ /* hsdes: 1809175790 */
+ cs = gen12_emit_aux_table_inv(request, cs);
+
*cs++ = preparser_disable(false);
intel_ring_advance(request, cs);
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fde54b86ea20..07e702bd16b5 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2526,6 +2526,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define HSW_GTT_CACHE_EN _MMIO(0x4024)
#define GTT_CACHE_EN_ALL 0xF0007FFF
#define GEN7_WR_WATERMARK _MMIO(0x4028)
+#define GEN12_GFX_CCS_AUX_NV _MMIO(0x4028)
+#define AUX_INV REG_BIT(0)
#define GEN7_GFX_PRIO_CTRL _MMIO(0x402C)
#define ARB_MODE _MMIO(0x4030)
#define ARB_MODE_SWIZZLE_SNB (1 << 4)
--
2.17.1
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