drm/xe: Add prefetch fault support for Xe3p

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Xe3p hardware prefetches memory ranges and notifies software via an
additional bit (bit 11) in the page fault descriptor that the fault
was caused by prefetch.

Extract the prefetch bit from the fault descriptor and echo it in the
response (bit 6) only when the page fault handling fails. This allows
the HW to suppress CAT errors for unsuccessful prefetch faults.

For prefetch faults that fail, increment stats counter without verbose
logging to avoid spamming the log. The prefetch flag is packed into
BIT(7) of the access_type field to avoid growing the consumer struct.

Based on original patches by Brian Welty <brian.welty@intel.com> and
Priyanka Dandamudi <priyanka.dandamudi@intel.com>.

Bspec: 59311
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Priyanka Dandamudi <priyanka.dandamudi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Varun Gupta <varun.gupta@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260223061906.1420883-3-varun.gupta@intel.com

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This commit is contained in:

Varun Gupta 2026-02-23 11:49:06 +05:30 • committed by Matthew Brost

parent c129f8ebca

commit f5ab554a6a

4 changed files with 25 additions and 11 deletions

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5

drivers/gpu/drm/xe/xe_guc_fwif.h

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6

drivers/gpu/drm/xe/xe_guc_pagefault.c

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19

drivers/gpu/drm/xe/xe_pagefault.c

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6

drivers/gpu/drm/xe/xe_pagefault_types.h

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