> -----Original Message----- > From: Atwood, Matthew S <matthew.s.atwood@xxxxxxxxx> > Sent: Friday, September 15, 2023 1:15 AM > To: Bhadane, Dnyaneshwar <dnyaneshwar.bhadane@xxxxxxxxx> > Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; De Marchi, Lucas > <lucas.demarchi@xxxxxxxxx>; Garg, Nemesa <nemesa.garg@xxxxxxxxx>; Roper, > Matthew D <matthew.d.roper@xxxxxxxxx>; Kandpal, Suraj > <suraj.kandpal@xxxxxxxxx> > Subject: Re: [PATCH v6] drm/i915: Add Wa_18022495364 > > On Fri, Sep 15, 2023 at 01:10:32AM +0530, Dnyaneshwar Bhadane wrote: > > Invalidate instruction and State cache bit using INDIRECT_CTX on every > > gpu context switch for gen12. > > The goal of this workaround is to actually perform an explicit > > invalidation of that cache (by re-writing the register) during every > > GPU context switch, which is accomplished via a "workaround batchbuffer" > > that's attached to the context via INDIRECT_CTX. (Matt Ropper) > > BSpec: 11354 > > > > Please refer [1] for more reviews and comment on the same patch > > > > [1] https://patchwork.freedesktop.org/patch/556154/ > > > > v2: > > - Remove extra parentheses from the condition (Lucas) > > - Align spacing and new line (Lucas) > > > > v3: > > - Fix commit message. > > > > v4: > > - Only GEN12 changes are kept (Matt Ropper) > Not clear to me what this means, Matt has corrected me by saying that this workaround should only be applied to Gen12 platforms. Initially, the patch was combined for the Gen12 and DG+ conditions, which was an incorrect understanding. Dnyaneshwar > > also its Matt Roper > > - Fix the commit message for r-b (Matt Ropper) > > - Rename the register bit in define > > > > v5: > > - Move out this workaround from golden context init (Matt Roper) > > - Use INDIRECT_CTX to set bit on each GPU context switch (Matt Roper) > > > > v6: > > - Change IP Version base condition for Gen12 (Matt Ropper) > Matt Roper > > - Made imperative form of commit version messages (Suraj) > > - s/Added/Add in patch header (Suraj) > > > > Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx> > > Cc: Matt Roper <matthew.d.roper@xxxxxxxxx> > > Cc: Suraj Kandpal <suraj.kandpal@xxxxxxxxx> > > Signed-off-by: Dnyaneshwar Bhadane <dnyaneshwar.bhadane@xxxxxxxxx> > > > > --- > > drivers/gpu/drm/i915/gt/intel_gt_regs.h | 2 ++ > > drivers/gpu/drm/i915/gt/intel_lrc.c | 13 +++++++++++++ > > 2 files changed, 15 insertions(+) > > > > diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h > > b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > > index a00ff51c681d..0d5260d126d8 100644 > > --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h > > +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h > > @@ -164,6 +164,8 @@ > > #define GEN9_CSFE_CHICKEN1_RCS _MMIO(0x20d4) > > #define GEN9_PREEMPT_GPGPU_SYNC_SWITCH_DISABLE (1 << 2) > > #define GEN11_ENABLE_32_PLANE_MODE (1 << 7) > > +#define GEN12_CS_DEBUG_MODE2 _MMIO(0x20d8) > > +#define INSTRUCTION_STATE_CACHE_INVALIDATE REG_BIT(6) > > > > #define GEN7_FF_SLICE_CS_CHICKEN1 _MMIO(0x20e0) > > #define GEN9_FFSC_PERCTX_PREEMPT_CTRL (1 << 14) > > diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c > > b/drivers/gpu/drm/i915/gt/intel_lrc.c > > index b99efa348ad1..56c916730e9b 100644 > > --- a/drivers/gpu/drm/i915/gt/intel_lrc.c > > +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c > > @@ -1333,6 +1333,15 @@ dg2_emit_draw_watermark_setting(u32 *cs) > > return cs; > > } > > > > +static u32 * > > +gen12_invalidate_state_cache(u32 *cs) { > > + *cs++ = MI_LOAD_REGISTER_IMM(1); > > + *cs++ = i915_mmio_reg_offset(GEN12_CS_DEBUG_MODE2); > > + *cs++ = > _MASKED_BIT_ENABLE(INSTRUCTION_STATE_CACHE_INVALIDATE); > > + return cs; > > +} > > + > > static u32 * > > gen12_emit_indirect_ctx_rcs(const struct intel_context *ce, u32 *cs) > > { @@ -1346,6 +1355,10 @@ gen12_emit_indirect_ctx_rcs(const struct > > intel_context *ce, u32 *cs) > > > > cs = gen12_emit_aux_table_inv(ce->engine, cs); > > > > + /* Wa_18022495364 */ > > + if (IS_GFX_GT_IP_RANGE(ce->engine->gt, IP_VER(12, 0), IP_VER(12, 10))) > > + cs = gen12_invalidate_state_cache(cs); > > + > > /* Wa_16014892111 */ > > if (IS_GFX_GT_IP_STEP(ce->engine->gt, IP_VER(12, 70), STEP_A0, > STEP_B0) || > > IS_GFX_GT_IP_STEP(ce->engine->gt, IP_VER(12, 71), STEP_A0, > > STEP_B0) || > > -- > > 2.34.1 > >
