[PATCH 10/16] drm/i915/guc/slpc: Add debugfs for slpc info

[Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>]

This prints out relevant SLPC info from the SLPC shared structure.

We will send a h2g message which forces SLPC to update the
shared data structure with latest information before reading it.

Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
Signed-off-by: Sundaresan Sujaritha <sujaritha.sundaresan@xxxxxxxxx>
---
 .../gpu/drm/i915/gt/uc/intel_guc_debugfs.c    | 16 ++++++
 drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c   | 53 +++++++++++++++++++
 drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h   |  3 ++
 3 files changed, 72 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c
index 9a03ff56e654..bef749e54601 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_debugfs.c
@@ -12,6 +12,7 @@
 #include "gt/uc/intel_guc_ct.h"
 #include "gt/uc/intel_guc_ads.h"
 #include "gt/uc/intel_guc_submission.h"
+#include "gt/uc/intel_guc_slpc.h"
 
 static int guc_info_show(struct seq_file *m, void *data)
 {
@@ -50,11 +51,26 @@ static int guc_registered_contexts_show(struct seq_file *m, void *data)
 }
 DEFINE_GT_DEBUGFS_ATTRIBUTE(guc_registered_contexts);
 
+static int guc_slpc_info_show(struct seq_file *m, void *unused)
+{
+	struct intel_guc *guc = m->private;
+	struct intel_guc_slpc *slpc = &guc->slpc;
+	struct drm_printer p = drm_seq_file_printer(m);
+
+	if (!intel_guc_slpc_is_used(guc))
+		return -ENODEV;
+
+	return intel_guc_slpc_info(slpc, &p);
+}
+
+DEFINE_GT_DEBUGFS_ATTRIBUTE(guc_slpc_info);
+
 void intel_guc_debugfs_register(struct intel_guc *guc, struct dentry *root)
 {
 	static const struct debugfs_gt_file files[] = {
 		{ "guc_info", &guc_info_fops, NULL },
 		{ "guc_registered_contexts", &guc_registered_contexts_fops, NULL },
+		{ "guc_slpc_info", &guc_slpc_info_fops, NULL},
 	};
 
 	if (!intel_guc_is_supported(guc))
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
index 98a283d31734..d179ba14ece6 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c
@@ -432,6 +432,59 @@ int intel_guc_slpc_enable(struct intel_guc_slpc *slpc)
 	return 0;
 }
 
+int intel_guc_slpc_info(struct intel_guc_slpc *slpc, struct drm_printer *p)
+{
+	struct drm_i915_private *i915 = guc_to_gt(slpc_to_guc(slpc))->i915;
+	struct slpc_shared_data *data;
+	struct slpc_platform_info *platform_info;
+	struct slpc_task_state_data *task_state_data;
+	intel_wakeref_t wakeref;
+	int ret = 0;
+
+	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
+
+	if (slpc_read_task_state(slpc)) {
+		ret = -EIO;
+		goto done;
+	}
+
+	GEM_BUG_ON(!slpc->vma);
+
+	drm_clflush_virt_range(slpc->vaddr, sizeof(struct slpc_shared_data));
+	data = slpc->vaddr;
+
+	platform_info = &data->platform_info;
+	task_state_data = &data->task_state_data;
+
+	drm_printf(p, "SLPC state: %s\n", slpc_state_stringify(data->global_state));
+	drm_printf(p, "\tgtperf task active: %d\n",
+			task_state_data->gtperf_task_active);
+	drm_printf(p, "\tdcc task active: %d\n",
+				task_state_data->dcc_task_active);
+	drm_printf(p, "\tin dcc: %d\n",
+				task_state_data->in_dcc);
+	drm_printf(p, "\tfreq switch active: %d\n",
+				task_state_data->freq_switch_active);
+	drm_printf(p, "\tibc enabled: %d\n",
+				task_state_data->ibc_enabled);
+	drm_printf(p, "\tibc active: %d\n",
+				task_state_data->ibc_active);
+	drm_printf(p, "\tpg1 enabled: %s\n",
+				yesno(task_state_data->pg1_enabled));
+	drm_printf(p, "\tpg1 active: %s\n",
+				yesno(task_state_data->pg1_active));
+	drm_printf(p, "\tmax freq: %dMHz\n",
+				DIV_ROUND_CLOSEST(data->task_state_data.max_unslice_freq *
+				GT_FREQUENCY_MULTIPLIER, GEN9_FREQ_SCALER));
+	drm_printf(p, "\tmin freq: %dMHz\n",
+				DIV_ROUND_CLOSEST(data->task_state_data.min_unslice_freq *
+				GT_FREQUENCY_MULTIPLIER, GEN9_FREQ_SCALER));
+
+done:
+	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
+	return ret;
+}
+
 void intel_guc_slpc_fini(struct intel_guc_slpc *slpc)
 {
 	if (!slpc->vma)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
index 2cb830cdacb5..cd12c5f19f4b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.h
@@ -10,6 +10,8 @@
 #include <linux/mutex.h>
 #include "intel_guc_slpc_fwif.h"
 
+struct drm_printer;
+
 struct intel_guc_slpc {
 	/*Protects access to vma and SLPC actions */
 	struct i915_vma *vma;
@@ -38,5 +40,6 @@ int intel_guc_slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 val);
 int intel_guc_slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 val);
 int intel_guc_slpc_get_max_freq(struct intel_guc_slpc *slpc, u32 *val);
 int intel_guc_slpc_get_min_freq(struct intel_guc_slpc *slpc, u32 *val);
+int intel_guc_slpc_info(struct intel_guc_slpc *slpc, struct drm_printer *p);
 
 #endif
-- 
2.25.0