gpu: nvgpu: Added lpwr_debug debugfs node

- lpwr_debug node to dump current pstate &
 PG status.

JIRA DNVGPU-165

Change-Id: I8240aea7145c3016946f4322fe0781d78ee2ec73
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: http://git-master/r/1253509
(cherry picked from commit 4852997df5b89aeb8544ed9092ccc9ee8b8c375e)
Reviewed-on: http://git-master/r/1271618
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
index 11baa7af..9e722889 100644
--- a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.c
@@ -5272,6 +5272,49 @@ int gk20a_aelpg_init_and_enable(struct gk20a *g, u8 ctrl_id)
 }
 
 #ifdef CONFIG_DEBUG_FS
+static int lpwr_debug_show(struct seq_file *s, void *data)
+{
+        struct gk20a *g = s->private;
+
+        if (g->ops.pmu.pmu_pg_engines_feature_list &&
+                g->ops.pmu.pmu_pg_engines_feature_list(g,
+                PMU_PG_ELPG_ENGINE_ID_GRAPHICS) !=
+                PMU_PG_FEATURE_GR_POWER_GATING_ENABLED) {
+                seq_printf(s, "PSTATE: %u\n"
+                        "RPPG Enabled: %u\n"
+                        "RPPG ref count: %u\n"
+                        "RPPG state: %u\n"
+                        "MSCG Enabled: %u\n"
+                        "MSCG pstate state: %u\n"
+                        "MSCG transition state: %u\n",
+                        g->ops.clk_arb.get_current_pstate(g),
+                        g->elpg_enabled, g->pmu.elpg_refcnt,
+                        g->pmu.elpg_stat, g->mscg_enabled,
+                        g->pmu.mscg_stat, g->pmu.mscg_transition_state);
+
+        } else
+                seq_printf(s, "ELPG Enabled: %u\n"
+                        "ELPG ref count: %u\n"
+                        "ELPG state: %u\n",
+                        g->elpg_enabled, g->pmu.elpg_refcnt,
+                        g->pmu.elpg_stat);
+
+        return 0;
+
+}
+
+static int lpwr_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, lpwr_debug_show, inode->i_private);
+}
+
+static const struct file_operations lpwr_debug_fops = {
+        .open           = lpwr_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static int mscg_stat_show(struct seq_file *s, void *data)
 {
         struct gk20a *g = s->private;
@@ -5614,6 +5657,12 @@ int gk20a_pmu_debugfs_init(struct device *dev)
         struct gk20a *g = get_gk20a(dev);
 
         d = debugfs_create_file(
+                "lpwr_debug", S_IRUGO|S_IWUSR, platform->debugfs, g,
+                                                &lpwr_debug_fops);
+        if (!d)
+                goto err_out;
+
+        d = debugfs_create_file(
                 "mscg_residency", S_IRUGO|S_IWUSR, platform->debugfs, g,
                                                 &mscg_stat_fops);
         if (!d)