drm/i915/xehp: Update topology dumps for Xe_HP

When running on Xe_HP or beyond, let's use an updated format for
describing topology in our error state dumps and debugfs to give a
more accurate view of the hardware:

 - Just report DSS directly without the legacy "slice0" output that's no
   longer meaningful.
 - Indicate whether each DSS is accessible for geometry and/or compute.
 - Rename "rcs_topology" to "sseu_topology" since the information
   reported is common to both RCS and CCS engines now.

v2:
 - Name static functions in a more consistent manner.  (Lucas)
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220311225459.385515-2-matthew.d.roper@intel.com

drivers/gpu/drm/i915/gt/intel_sseu.c

@@ -8,6 +8,8 @@
 #include "intel_gt_regs.h"
 #include "intel_sseu.h"
 
+#include "linux/string_helpers.h"
+
 void intel_sseu_set_info(struct sseu_dev_info *sseu, u8 max_slices,
 			 u8 max_subslices, u8 max_eus_per_subslice)
 {
@@ -33,7 +35,7 @@ intel_sseu_subslice_total(const struct sseu_dev_info *sseu)
 }
 
 static u32
-_intel_sseu_get_subslices(const struct sseu_dev_info *sseu,
+sseu_get_subslices(const struct sseu_dev_info *sseu,
 		   const u8 *subslice_mask, u8 slice)
 {
 	int i, offset = slice * sseu->ss_stride;
@@ -49,12 +51,17 @@ _intel_sseu_get_subslices(const struct sseu_dev_info *sseu,
 
 u32 intel_sseu_get_subslices(const struct sseu_dev_info *sseu, u8 slice)
 {
-	return _intel_sseu_get_subslices(sseu, sseu->subslice_mask, slice);
+	return sseu_get_subslices(sseu, sseu->subslice_mask, slice);
+}
+
+static u32 sseu_get_geometry_subslices(const struct sseu_dev_info *sseu)
+{
+	return sseu_get_subslices(sseu, sseu->geometry_subslice_mask, 0);
 }
 
 u32 intel_sseu_get_compute_subslices(const struct sseu_dev_info *sseu)
 {
-	return _intel_sseu_get_subslices(sseu, sseu->compute_subslice_mask, 0);
+	return sseu_get_subslices(sseu, sseu->compute_subslice_mask, 0);
 }
 
 void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int slice,
@@ -717,16 +724,11 @@ void intel_sseu_dump(const struct sseu_dev_info *sseu, struct drm_printer *p)
 	drm_printf(p, "has EU power gating: %s\n", yesno(sseu->has_eu_pg));
 }
 
-void intel_sseu_print_topology(const struct sseu_dev_info *sseu,
+static void sseu_print_hsw_topology(const struct sseu_dev_info *sseu,
 				    struct drm_printer *p)
 {
 	int s, ss;
 
-	if (sseu->max_slices == 0) {
-		drm_printf(p, "Unavailable\n");
-		return;
-	}
-
 	for (s = 0; s < sseu->max_slices; s++) {
 		drm_printf(p, "slice%d: %u subslice(s) (0x%08x):\n",
 			   s, intel_sseu_subslices_per_slice(sseu, s),
@@ -741,6 +743,36 @@ void intel_sseu_print_topology(const struct sseu_dev_info *sseu,
 	}
 }
 
+static void sseu_print_xehp_topology(const struct sseu_dev_info *sseu,
+				     struct drm_printer *p)
+{
+	u32 g_dss_mask = sseu_get_geometry_subslices(sseu);
+	u32 c_dss_mask = intel_sseu_get_compute_subslices(sseu);
+	int dss;
+
+	for (dss = 0; dss < sseu->max_subslices; dss++) {
+		u16 enabled_eus = sseu_get_eus(sseu, 0, dss);
+
+		drm_printf(p, "DSS_%02d: G:%3s C:%3s, %2u EUs (0x%04hx)\n", dss,
+			   str_yes_no(g_dss_mask & BIT(dss)),
+			   str_yes_no(c_dss_mask & BIT(dss)),
+			   hweight16(enabled_eus), enabled_eus);
+	}
+}
+
+void intel_sseu_print_topology(struct drm_i915_private *i915,
+			       const struct sseu_dev_info *sseu,
+			       struct drm_printer *p)
+{
+	if (sseu->max_slices == 0) {
+		drm_printf(p, "Unavailable\n");
+	} else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
+		sseu_print_xehp_topology(sseu, p);
+	} else {
+		sseu_print_hsw_topology(sseu, p);
+	}
+}
+
 u16 intel_slicemask_from_dssmask(u64 dss_mask, int dss_per_slice)
 {
 	u16 slice_mask = 0;

drivers/gpu/drm/i915/gt/intel_sseu.h

@@ -139,7 +139,8 @@ u32 intel_sseu_make_rpcs(struct intel_gt *gt,
 			 const struct intel_sseu *req_sseu);
 
 void intel_sseu_dump(const struct sseu_dev_info *sseu, struct drm_printer *p);
-void intel_sseu_print_topology(const struct sseu_dev_info *sseu,
+void intel_sseu_print_topology(struct drm_i915_private *i915,
+			       const struct sseu_dev_info *sseu,
 			       struct drm_printer *p);
 
 u16 intel_slicemask_from_dssmask(u64 dss_mask, int dss_per_slice);

drivers/gpu/drm/i915/gt/intel_sseu_debugfs.c

@@ -285,22 +285,22 @@ static int sseu_status_show(struct seq_file *m, void *unused)
 }
 DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(sseu_status);
 
-static int rcs_topology_show(struct seq_file *m, void *unused)
+static int sseu_topology_show(struct seq_file *m, void *unused)
 {
 	struct intel_gt *gt = m->private;
 	struct drm_printer p = drm_seq_file_printer(m);
 
-	intel_sseu_print_topology(&gt->info.sseu, &p);
+	intel_sseu_print_topology(gt->i915, &gt->info.sseu, &p);
 
 	return 0;
 }
-DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(rcs_topology);
+DEFINE_INTEL_GT_DEBUGFS_ATTRIBUTE(sseu_topology);
 
 void intel_sseu_debugfs_register(struct intel_gt *gt, struct dentry *root)
 {
 	static const struct intel_gt_debugfs_file files[] = {
 		{ "sseu_status", &sseu_status_fops, NULL },
-		{ "rcs_topology", &rcs_topology_fops, NULL },
+		{ "sseu_topology", &sseu_topology_fops, NULL },
 	};
 
 	intel_gt_debugfs_register_files(root, files, ARRAY_SIZE(files), gt);

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -710,7 +710,7 @@ static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 	struct drm_printer p = i915_error_printer(m);
 
 	intel_gt_info_print(&gt->info, &p);
-	intel_sseu_print_topology(&gt->info.sseu, &p);
+	intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
 }
 
 static void err_print_gt(struct drm_i915_error_state_buf *m,