1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/debug_gk20a.c b/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
index 85b24f2e..1a9ffe77 100644
--- a/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
@@ -228,6 +228,74 @@ void gk20a_init_debug_ops(struct gpu_ops *gops)
         gops->debug.show_dump = gk20a_debug_show_dump;
 }
 
+#ifdef CONFIG_DEBUG_FS
+static int railgate_residency_show(struct seq_file *s, void *data)
+{
+        struct device *dev = s->private;
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long time_since_last_state_transition_ms;
+        unsigned long total_rail_gate_time_ms;
+        unsigned long total_rail_ungate_time_ms;
+
+        if (platform->is_railgated(dev)) {
+                time_since_last_state_transition_ms =
+                                jiffies_to_msecs(jiffies -
+                                g->pstats.last_rail_gate_complete);
+                total_rail_ungate_time_ms = g->pstats.total_rail_ungate_time_ms;
+                total_rail_gate_time_ms =
+                                        g->pstats.total_rail_gate_time_ms +
+                                        time_since_last_state_transition_ms;
+        } else {
+                time_since_last_state_transition_ms =
+                                jiffies_to_msecs(jiffies -
+                                g->pstats.last_rail_ungate_complete);
+                total_rail_gate_time_ms = g->pstats.total_rail_gate_time_ms;
+                total_rail_ungate_time_ms =
+                                        g->pstats.total_rail_ungate_time_ms +
+                                        time_since_last_state_transition_ms;
+        }
+
+        seq_printf(s, "Time with Rails Gated: %lu ms\n"
+                        "Time with Rails UnGated: %lu ms\n"
+                        "Total railgating cycles: %lu\n",
+                        total_rail_gate_time_ms,
+                        total_rail_ungate_time_ms,
+                        g->pstats.railgating_cycle_count - 1);
+        return 0;
+
+}
+
+static int railgate_residency_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, railgate_residency_show, inode->i_private);
+}
+
+static const struct file_operations railgate_residency_fops = {
+        .open           = railgate_residency_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+int gk20a_railgating_debugfs_init(struct device *dev)
+{
+        struct dentry *d;
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+
+        if (!platform->can_railgate)
+                return 0;
+
+        d = debugfs_create_file(
+                "railgate_residency", S_IRUGO|S_IWUSR, platform->debugfs, dev,
+                                                &railgate_residency_fops);
+        if (!d)
+                return -ENOMEM;
+
+        return 0;
+}
+#endif
+
 void gk20a_debug_init(struct device *dev, const char *debugfs_symlink)
 {
         struct gk20a_platform *platform = dev_get_drvdata(dev);