[PATCH v3 i-g-t 4/4] lib/xe/xe_sriov_provisioning: Iterate only within valid PTE offsets

[Marcin Bernatowicz]

Update range-checking logic to iterate only within valid PTE offsets
based on MAX_WOPCM_SIZE and GUC_GGTT_TOP.

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/3507
Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
Cc: Adam Miszczak <adam.miszczak at linux.intel.com>
Cc: C V Narasimha <narasimha.c.v at intel.com>
Cc: Jakub Kolakowski <jakub1.kolakowski at intel.com>
Cc: K V P Satyanarayana <satyanarayana.k.v.p at intel.com>
Cc: Lukasz Laguna <lukasz.laguna at intel.com>
Cc: Michał Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski at intel.com>
Cc: Tomasz Lis <tomasz.lis at intel.com>
---
 lib/xe/xe_sriov_provisioning.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/xe/xe_sriov_provisioning.c b/lib/xe/xe_sriov_provisioning.c
index d448a53d8..67ae9cf54 100644
--- a/lib/xe/xe_sriov_provisioning.c
+++ b/lib/xe/xe_sriov_provisioning.c
@@ -39,6 +39,10 @@ const char *xe_sriov_shared_res_to_string(enum xe_sriov_shared_res res)
 #define PRE_1250_IP_VER_GGTT_PTE_VFID_MASK	GENMASK_ULL(4, 2)
 #define GGTT_PTE_VFID_MASK			GENMASK_ULL(11, 2)
 #define GGTT_PTE_VFID_SHIFT			2
+#define GUC_GGTT_TOP				0xFEE00000
+#define MAX_WOPCM_SIZE				SZ_8M
+#define START_PTE_OFFSET			(MAX_WOPCM_SIZE / SZ_4K * sizeof(xe_ggtt_pte_t))
+#define MAX_PTE_OFFSET				(GUC_GGTT_TOP / SZ_4K * sizeof(xe_ggtt_pte_t))
 
 static uint64_t get_vfid_mask(int fd)
 {
@@ -112,7 +116,8 @@ int xe_sriov_find_ggtt_provisioned_pte_offsets(int pf_fd, int gt, struct xe_mmio
 	*ranges = NULL;
 	*nr_ranges = 0;
 
-	for (uint32_t offset = 0; offset < SZ_8M; offset += sizeof(xe_ggtt_pte_t)) {
+	for (uint32_t offset = START_PTE_OFFSET; offset < MAX_PTE_OFFSET;
+	     offset += sizeof(xe_ggtt_pte_t)) {
 		pte = xe_mmio_ggtt_read(mmio, gt, offset);
 		vf_id = (pte & vfid_mask) >> GGTT_PTE_VFID_SHIFT;
 
-- 
2.31.1