[PATCH v29 2/5] drm/xe/xe_pagefault: Track address precision per pagefault

[Jonathan Cavitt <jonathan.cavitt@intel.com>]

Add an address precision field to the pagefault consumer.  This captures
the fact that pagefaults are reported on a SZ_4K granularity by GuC,
meaning the reported pagefault address is only the address of the page
where the faulting access occurred rather than the exact address of the
fault.  This field is necessary in case more reporters are added where
the granularity can be different.

Suggested-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
---
 drivers/gpu/drm/xe/xe_guc_pagefault.c   | 1 +
 drivers/gpu/drm/xe/xe_pagefault.c       | 2 ++
 drivers/gpu/drm/xe/xe_pagefault_types.h | 8 +++++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_guc_pagefault.c b/drivers/gpu/drm/xe/xe_guc_pagefault.c
index 719a18187a31..79b790fedda8 100644
--- a/drivers/gpu/drm/xe/xe_guc_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_guc_pagefault.c
@@ -74,6 +74,7 @@ int xe_guc_pagefault_handler(struct xe_guc *guc, u32 *msg, u32 len)
 				      << PFD_VIRTUAL_ADDR_HI_SHIFT) |
 		(FIELD_GET(PFD_VIRTUAL_ADDR_LO, msg[2]) <<
 		 PFD_VIRTUAL_ADDR_LO_SHIFT);
+	pf.consumer.addr_precision = 12;
 	pf.consumer.asid = FIELD_GET(PFD_ASID, msg[1]);
 	pf.consumer.access_type = FIELD_GET(PFD_ACCESS_TYPE, msg[2]);
 	pf.consumer.fault_type = FIELD_GET(PFD_FAULT_TYPE, msg[2]);
diff --git a/drivers/gpu/drm/xe/xe_pagefault.c b/drivers/gpu/drm/xe/xe_pagefault.c
index 0b625a52a598..47dec46515b5 100644
--- a/drivers/gpu/drm/xe/xe_pagefault.c
+++ b/drivers/gpu/drm/xe/xe_pagefault.c
@@ -231,6 +231,7 @@ static void xe_pagefault_print(struct xe_pagefault *pf)
 {
 	xe_gt_dbg(pf->gt, "\n\tASID: %d\n"
 		  "\tFaulted Address: 0x%08x%08x\n"
+		  "\tAddress Precision: %lu\n"
 		  "\tFaultType: %d\n"
 		  "\tAccessType: %d\n"
 		  "\tFaultLevel: %d\n"
@@ -239,6 +240,7 @@ static void xe_pagefault_print(struct xe_pagefault *pf)
 		  pf->consumer.asid,
 		  upper_32_bits(pf->consumer.page_addr),
 		  lower_32_bits(pf->consumer.page_addr),
+		  BIT(pf->consumer.addr_precision),
 		  pf->consumer.fault_type,
 		  pf->consumer.access_type,
 		  pf->consumer.fault_level,
diff --git a/drivers/gpu/drm/xe/xe_pagefault_types.h b/drivers/gpu/drm/xe/xe_pagefault_types.h
index d3b516407d60..2cf439658466 100644
--- a/drivers/gpu/drm/xe/xe_pagefault_types.h
+++ b/drivers/gpu/drm/xe/xe_pagefault_types.h
@@ -65,6 +65,12 @@ struct xe_pagefault {
 	struct {
 		/** @consumer.page_addr: address of page fault */
 		u64 page_addr;
+		/**
+		 * @consumer.addr_precision: precision of the page fault address.
+		 * u8 rather than u32 to keep compact - actual precision is
+		 * BIT(consumer.addr_precision).  Currently only 12
+		 */
+		u8 addr_precision;
 		/** @consumer.asid: address space ID */
 		u32 asid;
 		/**
@@ -85,7 +91,7 @@ struct xe_pagefault {
 		/** @consumer.engine_instance: engine instance */
 		u8 engine_instance;
 		/** consumer.reserved: reserved bits for future expansion */
-		u8 reserved[7];
+		u8 reserved[6];
 	} consumer;
 	/**
 	 * @producer: State for the producer (i.e., HW/FW interface). Populated
-- 
2.43.0