drm/xe/debugfs: Dump register save-restore tables

Add debugfs entry to dump the final tables with register save-restore
information.

For the workarounds, this has a format a little bit different than when the
values are applied because we don't want to read the values from the HW
when dumping via debugfs. For whitelist it just re-uses the print
function added for when the whitelist is being built.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230314003012.2600353-5-lucas.demarchi@intel.comSigned-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_gt_debugfs.c

@@ -16,6 +16,8 @@
 #include "xe_gt_topology.h"
 #include "xe_hw_engine.h"
 #include "xe_macros.h"
+#include "xe_reg_sr.h"
+#include "xe_reg_whitelist.h"
 #include "xe_uc_debugfs.h"
 
 static struct xe_gt *node_to_gt(struct drm_info_node *node)
@@ -98,6 +100,33 @@ static int ggtt(struct seq_file *m, void *data)
 	return xe_ggtt_dump(gt->mem.ggtt, &p);
 }
 
+static int register_save_restore(struct seq_file *m, void *data)
+{
+	struct xe_gt *gt = node_to_gt(m->private);
+	struct drm_printer p = drm_seq_file_printer(m);
+	struct xe_hw_engine *hwe;
+	enum xe_hw_engine_id id;
+
+	xe_reg_sr_dump(&gt->reg_sr, &p);
+	drm_printf(&p, "\n");
+
+	drm_printf(&p, "Engine\n");
+	for_each_hw_engine(hwe, gt, id)
+		xe_reg_sr_dump(&hwe->reg_sr, &p);
+	drm_printf(&p, "\n");
+
+	drm_printf(&p, "LRC\n");
+	for_each_hw_engine(hwe, gt, id)
+		xe_reg_sr_dump(&hwe->reg_lrc, &p);
+	drm_printf(&p, "\n");
+
+	drm_printf(&p, "Whitelist\n");
+	for_each_hw_engine(hwe, gt, id)
+		xe_reg_whitelist_dump(&hwe->reg_whitelist, &p);
+
+	return 0;
+}
+
 static const struct drm_info_list debugfs_list[] = {
 	{"hw_engines", hw_engines, 0},
 	{"force_reset", force_reset, 0},
@@ -105,6 +134,7 @@ static const struct drm_info_list debugfs_list[] = {
 	{"topology", topology, 0},
 	{"steering", steering, 0},
 	{"ggtt", ggtt, 0},
+	{"register-save-restore", register_save_restore, 0},
 };
 
 void xe_gt_debugfs_register(struct xe_gt *gt)

drivers/gpu/drm/xe/xe_reg_sr.c

@@ -229,3 +229,24 @@ void xe_reg_sr_apply_whitelist(struct xe_reg_sr *sr, u32 mmio_base,
 err_force_wake:
 	drm_err(&xe->drm, "Failed to apply, err=%d\n", err);
 }
+
+/**
+ * xe_reg_sr_dump - print all save/restore entries
+ * @sr: Save/restore entries
+ * @p: DRM printer
+ */
+void xe_reg_sr_dump(struct xe_reg_sr *sr, struct drm_printer *p)
+{
+	struct xe_reg_sr_entry *entry;
+	unsigned long reg;
+
+	if (!sr->name || xa_empty(&sr->xa))
+		return;
+
+	drm_printf(p, "%s\n", sr->name);
+	xa_for_each(&sr->xa, reg, entry)
+		drm_printf(p, "\tREG[0x%lx] clr=0x%08x set=0x%08x masked=%s mcr=%s\n",
+			   reg, entry->clr_bits, entry->set_bits,
+			   str_yes_no(entry->masked_reg),
+			   str_yes_no(entry->reg_type == XE_RTP_REG_MCR));
+}

drivers/gpu/drm/xe/xe_reg_sr.h

@@ -14,8 +14,10 @@
 
 struct xe_device;
 struct xe_gt;
+struct drm_printer;
 
 int xe_reg_sr_init(struct xe_reg_sr *sr, const char *name, struct xe_device *xe);
+void xe_reg_sr_dump(struct xe_reg_sr *sr, struct drm_printer *p);
 
 int xe_reg_sr_add(struct xe_reg_sr *sr, u32 reg,
 		  const struct xe_reg_sr_entry *e);

drivers/gpu/drm/xe/xe_reg_whitelist.c

@@ -108,3 +108,21 @@ void xe_reg_whitelist_print_entry(struct drm_printer *p, unsigned int indent,
 			  deny ? "deny" : "allow",
 			  access_str);
 }
+
+/**
+ * xe_reg_whitelist_dump - print all whitelist entries
+ * @sr: Save/restore entries
+ * @p: DRM printer
+ */
+void xe_reg_whitelist_dump(struct xe_reg_sr *sr, struct drm_printer *p)
+{
+	struct xe_reg_sr_entry *entry;
+	unsigned long reg;
+
+	if (!sr->name || xa_empty(&sr->xa))
+		return;
+
+	drm_printf(p, "%s\n", sr->name);
+	xa_for_each(&sr->xa, reg, entry)
+		xe_reg_whitelist_print_entry(p, 1, reg, entry);
+}

drivers/gpu/drm/xe/xe_reg_whitelist.h

@@ -10,6 +10,7 @@
 
 struct drm_printer;
 struct xe_hw_engine;
+struct xe_reg_sr;
 struct xe_reg_sr_entry;
 
 void xe_reg_whitelist_process_engine(struct xe_hw_engine *hwe);
@@ -17,4 +18,6 @@ void xe_reg_whitelist_process_engine(struct xe_hw_engine *hwe);
 void xe_reg_whitelist_print_entry(struct drm_printer *p, unsigned int indent,
 				  u32 reg, struct xe_reg_sr_entry *entry);
 
+void xe_reg_whitelist_dump(struct xe_reg_sr *sr, struct drm_printer *p);
+
 #endif