[Mesa-dev] [Mesa-stable] [PATCH V2 1/4] i965/gen10: Implement WaSampleOffsetIZ workaround

[Anuj Phogat]

On Mon, Nov 20, 2017 at 4:30 PM, Andres Gomez <agomez at igalia.com> wrote:
> Anuj, these 4 patches series landed in master without the "mesa-stable"
> tag, hence, just confirming that you dropped the nomination.
>
Yes, I dropped the mesa-stable tag. Thanks for confirming.

> Let me know if that was not the case.
>
> On Fri, 2017-10-06 at 16:30 -0700, Anuj Phogat wrote:
>> There are few other (duplicate) workarounds which have similar recommendations:
>> WaFlushHangWhenNonPipelineStateAndMarkerStalled
>> WaCSStallBefore3DSamplePattern
>> WaPipeControlBefore3DStateSamplePattern
>>
>> WaPipeControlBefore3DStateSamplePattern has some extra recommendations if
>> driver is using mid batch context restore. Ignoring it for now because We're
>> not doing mid-batch context restore in Mesa.
>>
>> Cc: mesa-stable at lists.freedesktop.org
>> Cc: Jason Ekstrand <jason at jlekstrand.net>
>> Cc: Rafael Antognolli <rafael.antognolli at intel.com>
>> Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
>> ---
>>  src/mesa/drivers/dri/i965/brw_context.h            |  2 +
>>  src/mesa/drivers/dri/i965/brw_defines.h            |  1 +
>>  src/mesa/drivers/dri/i965/brw_pipe_control.c       | 50 ++++++++++++++++++++++
>>  src/mesa/drivers/dri/i965/gen8_multisample_state.c |  8 ++++
>>  4 files changed, 61 insertions(+)
>>
>> diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
>> index 92fc16de13..f0e8d562e9 100644
>> --- a/src/mesa/drivers/dri/i965/brw_context.h
>> +++ b/src/mesa/drivers/dri/i965/brw_context.h
>> @@ -1647,6 +1647,8 @@ void brw_emit_post_sync_nonzero_flush(struct brw_context *brw);
>>  void brw_emit_depth_stall_flushes(struct brw_context *brw);
>>  void gen7_emit_vs_workaround_flush(struct brw_context *brw);
>>  void gen7_emit_cs_stall_flush(struct brw_context *brw);
>> +void gen10_emit_wa_cs_stall_flush(struct brw_context *brw);
>> +void gen10_emit_wa_lri_to_cache_mode_zero(struct brw_context *brw);
>>
>>  /* brw_queryformat.c */
>>  void brw_query_internal_format(struct gl_context *ctx, GLenum target,
>> diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
>> index 4abb790612..270cdf29db 100644
>> --- a/src/mesa/drivers/dri/i965/brw_defines.h
>> +++ b/src/mesa/drivers/dri/i965/brw_defines.h
>> @@ -1609,6 +1609,7 @@ enum brw_pixel_shader_coverage_mask_mode {
>>  #define GEN7_GPGPU_DISPATCHDIMY         0x2504
>>  #define GEN7_GPGPU_DISPATCHDIMZ         0x2508
>>
>> +#define GEN7_CACHE_MODE_0               0x7000
>>  #define GEN7_CACHE_MODE_1               0x7004
>>  # define GEN9_FLOAT_BLEND_OPTIMIZATION_ENABLE (1 << 4)
>>  # define GEN8_HIZ_NP_PMA_FIX_ENABLE        (1 << 11)
>> diff --git a/src/mesa/drivers/dri/i965/brw_pipe_control.c b/src/mesa/drivers/dri/i965/brw_pipe_control.c
>> index 460b8f73b6..156f5c25ec 100644
>> --- a/src/mesa/drivers/dri/i965/brw_pipe_control.c
>> +++ b/src/mesa/drivers/dri/i965/brw_pipe_control.c
>> @@ -278,6 +278,56 @@ gen7_emit_cs_stall_flush(struct brw_context *brw)
>>                                 brw->workaround_bo, 0, 0);
>>  }
>>
>> +static void
>> +brw_flush_gpu_caches(struct brw_context *brw) {
>> +   brw_emit_pipe_control_flush(brw,
>> +                               PIPE_CONTROL_CACHE_FLUSH_BITS |
>> +                               PIPE_CONTROL_CACHE_INVALIDATE_BITS);
>> +}
>> +
>> +/**
>> + * From Gen10 Workarounds page in h/w specs:
>> + * WaSampleOffsetIZ:
>> + * Prior to the 3DSTATE_SAMPLE_PATTERN driver must ensure there are no
>> + * markers in the pipeline by programming a PIPE_CONTROL with stall.
>> + */
>> +void
>> +gen10_emit_wa_cs_stall_flush(struct brw_context *brw)
>> +{
>> +   const struct gen_device_info *devinfo = &brw->screen->devinfo;
>> +   assert(devinfo->gen == 10);
>> +   brw_emit_pipe_control_flush(brw,
>> +                               PIPE_CONTROL_CS_STALL |
>> +                               PIPE_CONTROL_STALL_AT_SCOREBOARD);
>> +}
>> +
>> +/**
>> + * From Gen10 Workarounds page in h/w specs:
>> + * WaSampleOffsetIZ:
>> + * When 3DSTATE_SAMPLE_PATTERN is programmed, driver must then issue an
>> + * MI_LOAD_REGISTER_IMM command to an offset between 0x7000 and 0x7FFF(SVL)
>> + * after the command to ensure the state has been delivered prior to any
>> + * command causing a marker in the pipeline.
>> + */
>> +void
>> +gen10_emit_wa_lri_to_cache_mode_zero(struct brw_context *brw)
>> +{
>> +   const struct gen_device_info *devinfo = &brw->screen->devinfo;
>> +   assert(devinfo->gen == 10);
>> +
>> +   /* Before changing the value of CACHE_MODE_0 register, GFX pipeline must
>> +    * be idle; i.e., full flush is required.
>> +    */
>> +   brw_flush_gpu_caches(brw);
>> +
>> +   /* Write to CACHE_MODE_0 (0x7000) */
>> +   BEGIN_BATCH(3);
>> +   OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
>> +   OUT_BATCH(GEN7_CACHE_MODE_0);
>> +   OUT_BATCH(0);
>> +   ADVANCE_BATCH();
>> +}
>> +
>>  /**
>>   * Emits a PIPE_CONTROL with a non-zero post-sync operation, for
>>   * implementing two workarounds on gen6.  From section 1.4.7.1
>> diff --git a/src/mesa/drivers/dri/i965/gen8_multisample_state.c b/src/mesa/drivers/dri/i965/gen8_multisample_state.c
>> index 7a31a5df4a..14043025b6 100644
>> --- a/src/mesa/drivers/dri/i965/gen8_multisample_state.c
>> +++ b/src/mesa/drivers/dri/i965/gen8_multisample_state.c
>> @@ -49,6 +49,11 @@ gen8_emit_3dstate_multisample(struct brw_context *brw, unsigned num_samples)
>>  void
>>  gen8_emit_3dstate_sample_pattern(struct brw_context *brw)
>>  {
>> +   const struct gen_device_info *devinfo = &brw->screen->devinfo;
>> +
>> +   if (devinfo->gen == 10)
>> +      gen10_emit_wa_cs_stall_flush(brw);
>> +
>>     BEGIN_BATCH(9);
>>     OUT_BATCH(_3DSTATE_SAMPLE_PATTERN << 16 | (9 - 2));
>>
>> @@ -68,4 +73,7 @@ gen8_emit_3dstate_sample_pattern(struct brw_context *brw)
>>     /* 1x and 2x MSAA */
>>     OUT_BATCH(brw_multisample_positions_1x_2x);
>>     ADVANCE_BATCH();
>> +
>> +   if (devinfo->gen == 10)
>> +      gen10_emit_wa_lri_to_cache_mode_zero(brw);
>>  }
> --
> Br,
>
> Andres