gpu: nvgpu: sysfs to check if GPU is railgated

Add below sysfs to check if GPU is railgated or not :
/sys/devices/platform/gpu.0/is_railgated

Bug 200124736

Change-Id: Iafac48bbe82fcd422eeb2b948490e8dc8ad3801a
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/773457
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Sachin Nikam <snikam@nvidia.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c b/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
index d8da34d9..96a945f8 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
@@ -262,6 +262,19 @@ static ssize_t railgate_delay_show(struct device *dev,
 static DEVICE_ATTR(railgate_delay, ROOTRW, railgate_delay_show,
                    railgate_delay_store);
 
+static ssize_t is_railgated_show(struct device *dev,
+                           struct device_attribute *attr, char *buf)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        bool is_railgated = 0;
+
+        if (platform->is_railgated)
+                is_railgated = platform->is_railgated(platform->g->dev);
+
+        return snprintf(buf, PAGE_SIZE, "%s\n", is_railgated ? "yes" : "no");
+}
+static DEVICE_ATTR(is_railgated, S_IRUGO, is_railgated_show, NULL);
+
 static ssize_t clockgate_delay_store(struct device *dev,
                                      struct device_attribute *attr,
                                      const char *buf, size_t count)
@@ -691,6 +704,7 @@ void gk20a_remove_sysfs(struct device *dev)
         device_remove_file(dev, &dev_attr_counters_reset);
         device_remove_file(dev, &dev_attr_load);
         device_remove_file(dev, &dev_attr_railgate_delay);
+        device_remove_file(dev, &dev_attr_is_railgated);
         device_remove_file(dev, &dev_attr_clockgate_delay);
 #ifdef CONFIG_PM_RUNTIME
         device_remove_file(dev, &dev_attr_force_idle);
@@ -720,6 +734,7 @@ void gk20a_create_sysfs(struct platform_device *dev)
         error |= device_create_file(&dev->dev, &dev_attr_counters_reset);
         error |= device_create_file(&dev->dev, &dev_attr_load);
         error |= device_create_file(&dev->dev, &dev_attr_railgate_delay);
+        error |= device_create_file(&dev->dev, &dev_attr_is_railgated);
         error |= device_create_file(&dev->dev, &dev_attr_clockgate_delay);
 #ifdef CONFIG_PM_RUNTIME
         error |= device_create_file(&dev->dev, &dev_attr_force_idle);