[Intel-xe] [PATCH 2/2] drm/xe/xe2: Respond to TRTT faults as unsuccessful page fault

[Brian Welty]

SW is not expected to handle TRTT faults and should report these as
unsuccessful page fault in the reply, such that HW can respond by
raising a CAT error.

Signed-off-by: Brian Welty <brian.welty at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_pagefault.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c
index 959ea50c04db..2ee7005d7e39 100644
--- a/drivers/gpu/drm/xe/xe_gt_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_gt_pagefault.c
@@ -33,6 +33,7 @@ struct pagefault {
 	u8 engine_class;
 	u8 engine_instance;
 	u8 fault_unsuccessful;
+	bool trva_fault;
 };
 
 enum access_type {
@@ -137,6 +138,10 @@ static int handle_pagefault(struct xe_gt *gt, struct pagefault *pf)
 	int ret = 0;
 	bool atomic;
 
+	/* SW isn't expected to handle TRTT faults */
+	if (pf->trva_fault)
+		return -EFAULT;
+
 	/* ASID to VM */
 	mutex_lock(&xe->usm.lock);
 	vm = xa_load(&xe->usm.asid_to_vm, pf->asid);
@@ -281,6 +286,7 @@ static bool get_pagefault(struct pf_queue *pf_queue, struct pagefault *pf)
 			(pf_queue->data + pf_queue->head);
 
 		pf->fault_level = FIELD_GET(PFD_FAULT_LEVEL, desc->dw0);
+		pf->trva_fault = FIELD_GET(XE2_PFD_TRVA_FAULT, desc->dw0);
 		pf->engine_class = FIELD_GET(PFD_ENG_CLASS, desc->dw0);
 		pf->engine_instance = FIELD_GET(PFD_ENG_INSTANCE, desc->dw0);
 		pf->pdata = FIELD_GET(PFD_PDATA_HI, desc->dw1) <<
-- 
2.38.0