drm/xe/guc: Skip access counter queue init for unsupported platforms

Add a has_access_counter feature flag to the graphics IP descriptor
and skip writing parameters for the access counter queue in
guc_um_init_params(), leaving queue_params[2] zero-initialized
to signal unavailability to the GuC.

The queue_params[] array layout is fixed by firmware ABI, so we
maintain the structure with queues 0 and 1 (page fault request/response)
always configured, and queue 2 conditionally skipped based on the
has_access_counter flag.

Bspec: 59323
Cc: Stuart Summers <stuart.summers@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Suggested-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Varun Gupta <varun.gupta1@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/20260225164748.2302380-1-varun.gupta@intel.com
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>

4 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index caa8f34a6744..e9032014923d 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -153,6 +153,8 @@ struct xe_device {
 
 		/** @info.force_execlist: Forced execlist submission */
 		u8 force_execlist:1;
+		/** @info.has_access_counter: Device supports access counter */
+		u8 has_access_counter:1;
 		/** @info.has_asid: Has address space ID */
 		u8 has_asid:1;
 		/** @info.has_atomic_enable_pte_bit: Device has atomic enable PTE bit */
diff --git a/drivers/gpu/drm/xe/xe_guc_ads.c b/drivers/gpu/drm/xe/xe_guc_ads.c
index f4cbc030f4c8..81b5f01b1f65 100644
--- a/drivers/gpu/drm/xe/xe_guc_ads.c
+++ b/drivers/gpu/drm/xe/xe_guc_ads.c
@@ -819,6 +819,7 @@ static void guc_um_init_params(struct xe_guc_ads *ads)
 {
 	u32 um_queue_offset = guc_ads_um_queues_offset(ads);
 	struct xe_guc *guc = ads_to_guc(ads);
+	struct xe_device *xe = ads_to_xe(ads);
 	u64 base_dpa;
 	u32 base_ggtt;
 	bool with_dpa;
@@ -830,6 +831,16 @@ static void guc_um_init_params(struct xe_guc_ads *ads)
 	base_dpa = xe_bo_main_addr(ads->bo, PAGE_SIZE) + um_queue_offset;
 
 	for (i = 0; i < GUC_UM_HW_QUEUE_MAX; ++i) {
+		/*
+		 * Some platforms support USM but not access counters.
+		 * Skip ACCESS_COUNTER queue initialization for such
+		 * platforms, leaving queue_params[2] zero-initialized
+		 * to signal unavailability to the GuC.
+		 */
+		if (i == GUC_UM_HW_QUEUE_ACCESS_COUNTER &&
+		    !xe->info.has_access_counter)
+			continue;
+
 		ads_blob_write(ads, um_init_params.queue_params[i].base_dpa,
 			       with_dpa ? (base_dpa + (i * GUC_UM_QUEUE_SIZE)) : 0);
 		ads_blob_write(ads, um_init_params.queue_params[i].base_ggtt_address,
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index b48e84549888..8bd8d5c9171e 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -81,6 +81,7 @@ static const struct xe_graphics_desc graphics_xehpc = {
 
 	XE_HP_FEATURES,
 
+	.has_access_counter = 1,
 	.has_asid = 1,
 	.has_atomic_enable_pte_bit = 1,
 	.has_usm = 1,
@@ -98,6 +99,7 @@ static const struct xe_graphics_desc graphics_xelpg = {
 };
 
 #define XE2_GFX_FEATURES \
+	.has_access_counter = 1, \
 	.has_asid = 1, \
 	.has_atomic_enable_pte_bit = 1, \
 	.has_range_tlb_inval = 1, \
@@ -123,6 +125,7 @@ static const struct xe_graphics_desc graphics_xe3p_lpg = {
 
 static const struct xe_graphics_desc graphics_xe3p_xpc = {
 	XE2_GFX_FEATURES,
+	.has_access_counter = 0,
 	.has_indirect_ring_state = 1,
 	.hw_engine_mask =
 		GENMASK(XE_HW_ENGINE_BCS8, XE_HW_ENGINE_BCS1) |
@@ -944,6 +947,7 @@ static int xe_info_init(struct xe_device *xe,
 		media_desc = NULL;
 	}
 
+	xe->info.has_access_counter = graphics_desc->has_access_counter;
 	xe->info.has_asid = graphics_desc->has_asid;
 	xe->info.has_atomic_enable_pte_bit = graphics_desc->has_atomic_enable_pte_bit;
 	if (xe->info.platform != XE_PVC)
diff --git a/drivers/gpu/drm/xe/xe_pci_types.h b/drivers/gpu/drm/xe/xe_pci_types.h
index 47e8a1552c2b..8eee4fb1c57c 100644
--- a/drivers/gpu/drm/xe/xe_pci_types.h
+++ b/drivers/gpu/drm/xe/xe_pci_types.h
@@ -70,6 +70,7 @@ struct xe_graphics_desc {
 	u8 num_geometry_xecore_fuse_regs;
 	u8 num_compute_xecore_fuse_regs;
 
+	u8 has_access_counter:1;
 	u8 has_asid:1;
 	u8 has_atomic_enable_pte_bit:1;
 	u8 has_indirect_ring_state:1;