[PATCH] drm/xe/guc: Expose dss per group for GuC error capture

[Zhanjun Dong <zhanjun.dong@xxxxxxxxx>]

Expose helper for dss per group of mcr, GuC error capture feature
need this info to prepare buffer required.

Signed-off-by: Zhanjun Dong <zhanjun.dong@xxxxxxxxx>
---
 drivers/gpu/drm/xe/xe_gt_mcr.c          |  4 ++--
 drivers/gpu/drm/xe/xe_gt_mcr.h          |  1 +
 drivers/gpu/drm/xe/xe_gt_topology.c     |  3 ---
 drivers/gpu/drm/xe/xe_guc_capture.c     | 27 +++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_hw_engine_types.h |  3 +++
 5 files changed, 33 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_gt_mcr.c b/drivers/gpu/drm/xe/xe_gt_mcr.c
index 2029577957a4..80adf6887dd8 100644
--- a/drivers/gpu/drm/xe/xe_gt_mcr.c
+++ b/drivers/gpu/drm/xe/xe_gt_mcr.c
@@ -291,7 +291,7 @@ static void init_steering_mslice(struct xe_gt *gt)
 	gt->steering[LNCF].instance_target = 0;		/* unused */
 }
 
-static int num_dss_per_grp(struct xe_gt *gt)
+int xe_gt_mcr_get_dss_per_group(struct xe_gt *gt)
 {
 	struct xe_device *xe = gt_to_xe(gt);
 
@@ -313,7 +313,7 @@ static void init_steering_dss(struct xe_gt *gt)
 {
 	unsigned int dss = min(xe_dss_mask_group_ffs(gt->fuse_topo.g_dss_mask, 0, 0),
 			       xe_dss_mask_group_ffs(gt->fuse_topo.c_dss_mask, 0, 0));
-	unsigned int dss_per_grp = num_dss_per_grp(gt);
+	int dss_per_grp = xe_gt_mcr_get_dss_per_group(gt);
 
 	gt->steering[DSS].group_target = dss / dss_per_grp;
 	gt->steering[DSS].instance_target = dss % dss_per_grp;
diff --git a/drivers/gpu/drm/xe/xe_gt_mcr.h b/drivers/gpu/drm/xe/xe_gt_mcr.h
index 27ca1bc880a0..8f2603e2b520 100644
--- a/drivers/gpu/drm/xe/xe_gt_mcr.h
+++ b/drivers/gpu/drm/xe/xe_gt_mcr.h
@@ -14,6 +14,7 @@ struct xe_gt;
 void xe_gt_mcr_init(struct xe_gt *gt);
 
 void xe_gt_mcr_set_implicit_defaults(struct xe_gt *gt);
+int xe_gt_mcr_get_dss_per_group(struct xe_gt *gt);
 
 u32 xe_gt_mcr_unicast_read(struct xe_gt *gt, struct xe_reg_mcr mcr_reg,
 			   int group, int instance);
diff --git a/drivers/gpu/drm/xe/xe_gt_topology.c b/drivers/gpu/drm/xe/xe_gt_topology.c
index 33c69795c16a..784ebf15e301 100644
--- a/drivers/gpu/drm/xe/xe_gt_topology.c
+++ b/drivers/gpu/drm/xe/xe_gt_topology.c
@@ -11,9 +11,6 @@
 #include "xe_gt.h"
 #include "xe_mmio.h"
 
-#define XE_MAX_DSS_FUSE_BITS (32 * XE_MAX_DSS_FUSE_REGS)
-#define XE_MAX_EU_FUSE_BITS (32 * XE_MAX_EU_FUSE_REGS)
-
 static void
 load_dss_mask(struct xe_gt *gt, xe_dss_mask_t mask, int numregs, ...)
 {
diff --git a/drivers/gpu/drm/xe/xe_guc_capture.c b/drivers/gpu/drm/xe/xe_guc_capture.c
index 8bf756fa34e2..5e8b063f723f 100644
--- a/drivers/gpu/drm/xe/xe_guc_capture.c
+++ b/drivers/gpu/drm/xe/xe_guc_capture.c
@@ -93,6 +93,33 @@
 	{ SFC_DONE(2),		    0,      0, "SFC_DONE[2]" }, \
 	{ SFC_DONE(3),		    0,      0, "SFC_DONE[3]" }
 
+static inline void xe_gt_mcr_get_ss_steering(struct xe_gt *gt, unsigned int dss,
+					     unsigned int *group, unsigned int *instance)
+{
+	int dss_per_grp = xe_gt_mcr_get_dss_per_group(gt);
+	*group = dss / dss_per_grp;
+	*instance = dss % dss_per_grp;
+}
+
+static inline bool xe_sseu_has_subslice(struct xe_gt *gt, int slice, int subslice)
+{
+	int dss_per_grp = xe_gt_mcr_get_dss_per_group(gt);
+	int index = slice * dss_per_grp + subslice;
+	return index >= XE_MAX_DSS_FUSE_BITS ? false : test_bit(index, gt->fuse_topo.g_dss_mask);
+}
+
+#define _HAS_SS(ss_, gt_, group_, instance_) xe_sseu_has_subslice(gt_, group_, instance_)
+
+/*
+ * Loop over each subslice/DSS and determine the group and instance IDs that
+ * should be used to steer MCR accesses toward this DSS.
+ */
+#define for_each_ss_steering(ss_, gt_, group_, instance_) \
+	for (ss_ = 0, xe_gt_mcr_get_ss_steering(gt_, 0, &group_, &instance_); \
+	     ss_ < XE_MAX_DSS_FUSE_BITS; \
+	     ss_++, xe_gt_mcr_get_ss_steering(gt_, ss_, &group_, &instance_)) \
+		for_each_if(_HAS_SS(ss_, gt_, group_, instance_))
+
 int xe_guc_capture_init(struct xe_guc *guc)
 {
 	return 0;
diff --git a/drivers/gpu/drm/xe/xe_hw_engine_types.h b/drivers/gpu/drm/xe/xe_hw_engine_types.h
index dfeaaac08b7f..c258228b244f 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine_types.h
+++ b/drivers/gpu/drm/xe/xe_hw_engine_types.h
@@ -65,6 +65,9 @@ struct xe_bo;
 struct xe_execlist_port;
 struct xe_gt;
 
+#define XE_MAX_DSS_FUSE_BITS (32 * XE_MAX_DSS_FUSE_REGS)
+#define XE_MAX_EU_FUSE_BITS (32 * XE_MAX_EU_FUSE_REGS)
+
 /**
  * struct xe_hw_engine_class_intf - per hw engine class struct interface
  *
-- 
2.34.1