gpu: nvgpu: APIs to dump GR status

Add below APIs to dump various GR status registers

1. debugfs : /d/gpu.0/gr_status
Read this debugfs at runtime to get status registers

2. API gk20a_gr_debug_dump()
Add this API in code to dump registers at any point

Bug 200062436

Change-Id: Ic1115b5a2fc16362954b5ed8a9e70afb872a8d91
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/486465
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 59 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/debug_gk20a.c b/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
index 1351304d..9dfab370 100644
--- a/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/debug_gk20a.c
@@ -83,7 +83,7 @@ static inline void gk20a_debug_write_to_seqfile(void *ctx, const char *str,
         seq_write((struct seq_file *)ctx, str, len);
 }
 
-static void gk20a_debug_output(struct gk20a_debug_output *o,
+void gk20a_debug_output(struct gk20a_debug_output *o,
                                         const char *fmt, ...)
 {
         va_list args;
@@ -223,6 +223,50 @@ void gk20a_debug_show_dump(struct gk20a *g, struct gk20a_debug_output *o)
         gk20a_idle(g->dev);
 }
 
+static int gk20a_gr_dump_regs(struct platform_device *pdev,
+                struct gk20a_debug_output *o)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(pdev);
+        struct gk20a *g = platform->g;
+        int err;
+
+        err = gk20a_busy(g->dev);
+        if (err) {
+                gk20a_err(&pdev->dev, "failed to power on gpu: %d\n", err);
+                return -EINVAL;
+        }
+
+        gr_gk20a_elpg_protected_call(g, g->ops.gr.dump_gr_regs(g, o));
+
+        gk20a_idle(g->dev);
+
+        return 0;
+}
+
+int gk20a_gr_debug_dump(struct platform_device *pdev)
+{
+        struct gk20a_debug_output o = {
+                .fn = gk20a_debug_write_printk
+        };
+
+        gk20a_gr_dump_regs(pdev, &o);
+
+        return 0;
+}
+
+static int gk20a_gr_debug_show(struct seq_file *s, void *unused)
+{
+        struct platform_device *pdev = s->private;
+        struct gk20a_debug_output o = {
+                .fn = gk20a_debug_write_to_seqfile,
+                .ctx = s,
+        };
+
+        gk20a_gr_dump_regs(pdev, &o);
+
+        return 0;
+}
+
 void gk20a_debug_dump(struct platform_device *pdev)
 {
         struct gk20a_platform *platform = gk20a_get_platform(pdev);
@@ -277,11 +321,23 @@ static int gk20a_debug_show(struct seq_file *s, void *unused)
         return 0;
 }
 
+static int gk20a_gr_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, gk20a_gr_debug_show, inode->i_private);
+}
+
 static int gk20a_debug_open(struct inode *inode, struct file *file)
 {
         return single_open(file, gk20a_debug_show, inode->i_private);
 }
 
+static const struct file_operations gk20a_gr_debug_fops = {
+        .open           = gk20a_gr_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static const struct file_operations gk20a_debug_fops = {
         .open           = gk20a_debug_open,
         .read           = seq_read,
@@ -306,6 +362,8 @@ void gk20a_debug_init(struct platform_device *pdev)
 
         debugfs_create_file("status", S_IRUGO, platform->debugfs,
                         pdev, &gk20a_debug_fops);
+        debugfs_create_file("gr_status", S_IRUGO, platform->debugfs,
+                        pdev, &gk20a_gr_debug_fops);
         debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, platform->debugfs,
                         &gk20a_debug_trace_cmdbuf);