[Intel-xe] [PATCH 5/7] drm/xe/debugfs: Dump register save-restore tables

[Lucas De Marchi]

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

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_debugfs.c | 24 ++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_reg_sr.c     | 17 +++++++++++++++++
 drivers/gpu/drm/xe/xe_reg_sr.h     |  2 ++
 3 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_debugfs.c b/drivers/gpu/drm/xe/xe_gt_debugfs.c
index 78942e12e76c..2db4863ba57e 100644
--- a/drivers/gpu/drm/xe/xe_gt_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_gt_debugfs.c
@@ -16,6 +16,7 @@
 #include "xe_gt_topology.h"
 #include "xe_hw_engine.h"
 #include "xe_macros.h"
+#include "xe_reg_sr.h"
 #include "xe_uc_debugfs.h"
 
 static struct xe_gt *node_to_gt(struct drm_info_node *node)
@@ -98,6 +99,28 @@ 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);
+
+	return 0;
+}
+
 static const struct drm_info_list debugfs_list[] = {
 	{"hw_engines", hw_engines, 0},
 	{"force_reset", force_reset, 0},
@@ -105,6 +128,7 @@ 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)
diff --git a/drivers/gpu/drm/xe/xe_reg_sr.c b/drivers/gpu/drm/xe/xe_reg_sr.c
index 194a5060f1b3..855d86a6c43a 100644
--- a/drivers/gpu/drm/xe/xe_reg_sr.c
+++ b/drivers/gpu/drm/xe/xe_reg_sr.c
@@ -8,6 +8,7 @@
 #include <linux/align.h>
 #include <linux/string_helpers.h>
 #include <linux/xarray.h>
+#include <linux/string_helpers.h>
 
 #include <drm/drm_managed.h>
 #include <drm/drm_print.h>
@@ -220,3 +221,19 @@ 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);
 }
+
+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));
+}
diff --git a/drivers/gpu/drm/xe/xe_reg_sr.h b/drivers/gpu/drm/xe/xe_reg_sr.h
index 9f47230c8ddc..3af369089faa 100644
--- a/drivers/gpu/drm/xe/xe_reg_sr.h
+++ b/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);
-- 
2.39.0