Oscar Mateo <oscar.mateo@xxxxxxxxx> writes:
> Revert to an L3 non-hash model, for performance reasons.
>
> v2:
> - Place the WA name above the actual change
> - Improve the register naming
> v3:
> - Rebased
> - Renamed to Wa_1604223664
> v4: Rebased on top of the WA refactoring
> v5:
> - Added References (Mika)
> - Fixed wrong mask and value (Mika)
> - Do not apply together with another WA for the same
> register (not worth the hassle)
>
> References: HSDES#1604223664
> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_reg.h | 6 ++++++
> drivers/gpu/drm/i915/intel_workarounds.c | 10 ++++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 0671066..62c4fd2 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8253,6 +8253,12 @@ enum {
> #define GEN8_GARBCNTL _MMIO(0xB004)
> #define GEN9_GAPS_TSV_CREDIT_DISABLE (1 << 7)
> #define GEN11_ARBITRATION_PRIO_ORDER_MASK (0x3f << 22)
> +#define GEN11_HASH_CTRL_EXCL_MASK (0x7f << 0)
> +#define GEN11_HASH_CTRL_EXCL_BIT0 (1 << 0)
> +
> +#define GEN11_GLBLINVL _MMIO(0xB404)
> +#define GEN11_BANK_HASH_ADDR_EXCL_MASK (0x7f << 5)
> +#define GEN11_BANK_HASH_ADDR_EXCL_BIT0 (1 << 5)
>
> #define GEN10_DFR_RATIO_EN_AND_CHICKEN _MMIO(0x9550)
> #define DFR_DISABLE (1 << 9)
> diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
> index 68e6caa..93591a0 100644
> --- a/drivers/gpu/drm/i915/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/intel_workarounds.c
> @@ -705,6 +705,16 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
> */
> I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
> GEN11_ARBITRATION_PRIO_ORDER_MASK));
> +
> + /* Wa_1604223664:icl
> + * Formerly known as WaL3BankAddressHashing
> + */
> + I915_WRITE(GEN8_GARBCNTL,
> + ((I915_READ(GEN8_GARBCNTL) & ~GEN11_HASH_CTRL_EXCL_MASK) |
> + GEN11_HASH_CTRL_EXCL_BIT0));
> + I915_WRITE(GEN11_GLBLINVL,
> + ((I915_READ(GEN11_GLBLINVL) & ~GEN11_BANK_HASH_ADDR_EXCL_MASK) |
> + GEN11_BANK_HASH_ADDR_EXCL_BIT0));
> }
>
> void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)
> --
> 1.9.1
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