[Intel-gfx] [PATCH v1.1] drm/i915/mtl: Implement Wa_14019141245

[Kalvala, Haridhar]

On 4/26/2023 12:00 AM, Radhakrishna Sripada wrote:
> Enable strict RAR to prevent spurious GPU hangs.
>
> v1.1: Rebase
>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
> Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
> ---
>   drivers/gpu/drm/i915/gt/intel_gt_regs.h     | 5 +++++
>   drivers/gpu/drm/i915/gt/intel_workarounds.c | 4 ++++
>   drivers/gpu/drm/i915/i915_perf_oa_regs.h    | 4 ----
>   3 files changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> index e8c3b762a92a..af80d2fe739b 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
> @@ -529,6 +529,11 @@
>   
>   #define GEN8_RC6_CTX_INFO			_MMIO(0x8504)
>   
> +#define GEN12_SQCNT1				_MMIO(0x8718)
> +#define   GEN12_SQCNT1_PMON_ENABLE		REG_BIT(30)
> +#define   GEN12_SQCNT1_OABPC			REG_BIT(29)
> +#define   GEN12_STRICT_RAR_ENABLE		REG_BIT(23)
> +
>   #define XEHP_SQCM				MCR_REG(0x8724)
>   #define   EN_32B_ACCESS				REG_BIT(30)
>   
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index de4f8e2e8e8c..ad9e7f49a6fa 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -1699,6 +1699,9 @@ xelpg_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
>   	wa_mcr_write_or(wal, RENDER_MOD_CTRL, FORCE_MISS_FTLB);
>   	wa_mcr_write_or(wal, COMP_MOD_CTRL, FORCE_MISS_FTLB);
>   
> +	/* Wa_14019141245 */
> +	wa_write_or(wal, GEN12_SQCNT1, GEN12_STRICT_RAR_ENABLE);
> +
looks good to me.
>   	if (IS_MTL_GRAPHICS_STEP(gt->i915, M, STEP_A0, STEP_B0) ||
>   	    IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0)) {
>   		/* Wa_14014830051 */
> @@ -1707,6 +1710,7 @@ xelpg_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
>   		/* Wa_14015795083 */
>   		wa_write_clr(wal, GEN7_MISCCPCTL, GEN12_DOP_CLOCK_GATE_RENDER_ENABLE);
>   	}
> +
>   	/*
>   	 * Unlike older platforms, we no longer setup implicit steering here;
>   	 * all MCR accesses are explicitly steered.
> diff --git a/drivers/gpu/drm/i915/i915_perf_oa_regs.h b/drivers/gpu/drm/i915/i915_perf_oa_regs.h
> index ba103875e19f..e5ac7a8b5cb6 100644
> --- a/drivers/gpu/drm/i915/i915_perf_oa_regs.h
> +++ b/drivers/gpu/drm/i915/i915_perf_oa_regs.h
> @@ -134,10 +134,6 @@
>   #define GDT_CHICKEN_BITS    _MMIO(0x9840)
>   #define   GT_NOA_ENABLE	    0x00000080
>   
> -#define GEN12_SQCNT1				_MMIO(0x8718)
> -#define   GEN12_SQCNT1_PMON_ENABLE		REG_BIT(30)
> -#define   GEN12_SQCNT1_OABPC			REG_BIT(29)
These two register bit and register(0x8718) moved to " 
intel_gt_regs.h"not getting used elsewhere(I mean, in i915_perf.c) ?
> -
>   /* Gen12 OAM unit */
>   #define GEN12_OAM_HEAD_POINTER_OFFSET   (0x1a0)
>   #define  GEN12_OAM_HEAD_POINTER_MASK    0xffffffc0

-- 
Regards,
Haridhar Kalvala