Re: [PATCH v5 1/2] drm/xe: Add counter for invalid prefetch pagefaults

[Matthew Brost <matthew.brost@intel.com>]

On Mon, Feb 23, 2026 at 09:37:28AM +0530, Varun Gupta wrote:
> Add a stats counter for invalid prefetch page faults to avoid
> excessive logging.
> 
> Originally-by: Lucas De Marchi <lucas.demarchi@intel.com>
> Cc: Matthew Brost <matthew.brost@intel.com>

Reviewed-by: Matthew Brost <matthew.brost@intel.com>

> Cc: Matt Roper <matthew.d.roper@intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
> Signed-off-by: Varun Gupta <varun.gupta@intel.com>
> 
> ---
> v3:
>  - New patch splitting stats counter from main prefetch implementation (Matt Brost)
>  - Renamed from PREFETCH_PAGEFAULT_COUNT to INVALID_PREFETCH_PAGEFAULT_COUNT (Matt Brost)
> ---
>  drivers/gpu/drm/xe/xe_gt_stats.c       | 1 +
>  drivers/gpu/drm/xe/xe_gt_stats_types.h | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_gt_stats.c b/drivers/gpu/drm/xe/xe_gt_stats.c
> index 8ed0160a6041..81cec441b449 100644
> --- a/drivers/gpu/drm/xe/xe_gt_stats.c
> +++ b/drivers/gpu/drm/xe/xe_gt_stats.c
> @@ -60,6 +60,7 @@ static const char *const stat_description[__XE_GT_STATS_NUM_IDS] = {
>  	DEF_STAT_STR(SVM_TLB_INVAL_US, "svm_tlb_inval_us"),
>  	DEF_STAT_STR(VMA_PAGEFAULT_COUNT, "vma_pagefault_count"),
>  	DEF_STAT_STR(VMA_PAGEFAULT_KB, "vma_pagefault_kb"),
> +	DEF_STAT_STR(INVALID_PREFETCH_PAGEFAULT_COUNT, "invalid_prefetch_pagefault_count"),
>  	DEF_STAT_STR(SVM_4K_PAGEFAULT_COUNT, "svm_4K_pagefault_count"),
>  	DEF_STAT_STR(SVM_64K_PAGEFAULT_COUNT, "svm_64K_pagefault_count"),
>  	DEF_STAT_STR(SVM_2M_PAGEFAULT_COUNT, "svm_2M_pagefault_count"),
> diff --git a/drivers/gpu/drm/xe/xe_gt_stats_types.h b/drivers/gpu/drm/xe/xe_gt_stats_types.h
> index 79568591bd67..b6081c312474 100644
> --- a/drivers/gpu/drm/xe/xe_gt_stats_types.h
> +++ b/drivers/gpu/drm/xe/xe_gt_stats_types.h
> @@ -15,6 +15,7 @@ enum xe_gt_stats_id {
>  	XE_GT_STATS_ID_SVM_TLB_INVAL_US,
>  	XE_GT_STATS_ID_VMA_PAGEFAULT_COUNT,
>  	XE_GT_STATS_ID_VMA_PAGEFAULT_KB,
> +	XE_GT_STATS_ID_INVALID_PREFETCH_PAGEFAULT_COUNT,
>  	XE_GT_STATS_ID_SVM_4K_PAGEFAULT_COUNT,
>  	XE_GT_STATS_ID_SVM_64K_PAGEFAULT_COUNT,
>  	XE_GT_STATS_ID_SVM_2M_PAGEFAULT_COUNT,
> -- 
> 2.43.0
>