On Tue, Apr 19, 2022 at 07:44:53AM -0700, José Roberto de Souza wrote: > A new DG2 workaround added to some corner cases hangs. > > BSpec: 54077 > BSpec: 68173 > BSpec: 71488 > Cc: Matt Roper <matthew.d.ro...@intel.com> > Signed-off-by: José Roberto de Souza <jose.so...@intel.com> > --- > drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 + > drivers/gpu/drm/i915/gt/intel_workarounds.c | 3 +++ > 2 files changed, 4 insertions(+) > > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h > b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > index 0a5c2648aaf07..10db058d9038c 100644 > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > @@ -368,6 +368,7 @@ > #define GEN9_FACTOR_IN_CLR_VAL_HIZ (1 << 9) > > #define VFLSKPD _MMIO(0x62a8) > +#define VF_PREFETCH_TLB_DIS REG_BIT(5) > #define DIS_OVER_FETCH_CACHE REG_BIT(1) > #define DIS_MULT_MISS_RD_SQUASH REG_BIT(0) > > diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c > b/drivers/gpu/drm/i915/gt/intel_workarounds.c > index 29c8cd0a81b6f..a1ba775bcb705 100644 > --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c > +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c > @@ -688,6 +688,9 @@ static void dg2_ctx_workarounds_init(struct > intel_engine_cs *engine, > if (IS_DG2_GRAPHICS_STEP(engine->i915, G10, STEP_B0, STEP_FOREVER) || > IS_DG2_G11(engine->i915) || IS_DG2_G12(engine->i915)) > wa_masked_field_set(wal, VF_PREEMPTION, > PREEMPTION_VERTEX_COUNT, 0x4000); > + > + /* Wa_18019627453:dg2 */
I just took a closer look at this one...it looks like the DG2-specific version of this workaround (e.g., per-platform ID #14015981138) lists two potential workarounds: the prefetch TLB bit you're setting here, or a fixed function DOP clock gate bit. The suggestion (on DG2 specifically) is to use the DOP gate bit. So we might want to switch this implementation, even if other platforms wind up going with the other option. Matt > + wa_masked_en(wal, VFLSKPD, VF_PREFETCH_TLB_DIS); > } > > static void fakewa_disable_nestedbb_mode(struct intel_engine_cs *engine, > -- > 2.35.3 > -- Matt Roper Graphics Software Engineer VTT-OSGC Platform Enablement Intel Corporation (916) 356-2795
