drm/i915: move gpu error sysfs to i915_gpu_error.c

Hide gpu error specifics in i915_gpu_error.c. This is also cleaner wrt
conditional compilation, as i915_gpu_error.c is only built with
DRM_I915_CAPTURE_ERROR=y.

With this, we can also make i915_first_error_state() static.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231031124502.1772160-3-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -57,6 +57,7 @@
 #include "i915_memcpy.h"
 #include "i915_reg.h"
 #include "i915_scatterlist.h"
+#include "i915_sysfs.h"
 #include "i915_utils.h"
 
 #define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
@@ -2208,7 +2209,7 @@ void i915_capture_error_state(struct intel_gt *gt,
 	i915_gpu_coredump_put(error);
 }
 
-struct i915_gpu_coredump *
+static struct i915_gpu_coredump *
 i915_first_error_state(struct drm_i915_private *i915)
 {
 	struct i915_gpu_coredump *error;
@@ -2484,3 +2485,75 @@ void i915_gpu_error_debugfs_register(struct drm_i915_private *i915)
 	debugfs_create_file("i915_gpu_info", 0644, minor->debugfs_root, i915,
 			    &i915_gpu_info_fops);
 }
+
+static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
+				struct bin_attribute *attr, char *buf,
+				loff_t off, size_t count)
+{
+
+	struct device *kdev = kobj_to_dev(kobj);
+	struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
+	struct i915_gpu_coredump *gpu;
+	ssize_t ret = 0;
+
+	/*
+	 * FIXME: Concurrent clients triggering resets and reading + clearing
+	 * dumps can cause inconsistent sysfs reads when a user calls in with a
+	 * non-zero offset to complete a prior partial read but the
+	 * gpu_coredump has been cleared or replaced.
+	 */
+
+	gpu = i915_first_error_state(i915);
+	if (IS_ERR(gpu)) {
+		ret = PTR_ERR(gpu);
+	} else if (gpu) {
+		ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count);
+		i915_gpu_coredump_put(gpu);
+	} else {
+		const char *str = "No error state collected\n";
+		size_t len = strlen(str);
+
+		if (off < len) {
+			ret = min_t(size_t, count, len - off);
+			memcpy(buf, str + off, ret);
+		}
+	}
+
+	return ret;
+}
+
+static ssize_t error_state_write(struct file *file, struct kobject *kobj,
+				 struct bin_attribute *attr, char *buf,
+				 loff_t off, size_t count)
+{
+	struct device *kdev = kobj_to_dev(kobj);
+	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
+
+	drm_dbg(&dev_priv->drm, "Resetting error state\n");
+	i915_reset_error_state(dev_priv);
+
+	return count;
+}
+
+static const struct bin_attribute error_state_attr = {
+	.attr.name = "error",
+	.attr.mode = S_IRUSR | S_IWUSR,
+	.size = 0,
+	.read = error_state_read,
+	.write = error_state_write,
+};
+
+void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915)
+{
+	struct device *kdev = i915->drm.primary->kdev;
+
+	if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
+		drm_err(&i915->drm, "error_state sysfs setup failed\n");
+}
+
+void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915)
+{
+	struct device *kdev = i915->drm.primary->kdev;
+
+	sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
+}

drivers/gpu/drm/i915/i915_gpu_error.h

@@ -323,11 +323,12 @@ static inline void i915_gpu_coredump_put(struct i915_gpu_coredump *gpu)
 		kref_put(&gpu->ref, __i915_gpu_coredump_free);
 }
 
-struct i915_gpu_coredump *i915_first_error_state(struct drm_i915_private *i915);
 void i915_reset_error_state(struct drm_i915_private *i915);
 void i915_disable_error_state(struct drm_i915_private *i915, int err);
 
 void i915_gpu_error_debugfs_register(struct drm_i915_private *i915);
+void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915);
+void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915);
 
 #else
 
@@ -396,12 +397,6 @@ static inline void i915_gpu_coredump_put(struct i915_gpu_coredump *gpu)
 {
 }
 
-static inline struct i915_gpu_coredump *
-i915_first_error_state(struct drm_i915_private *i915)
-{
-	return ERR_PTR(-ENODEV);
-}
-
 static inline void i915_reset_error_state(struct drm_i915_private *i915)
 {
 }
@@ -415,6 +410,14 @@ static inline void i915_gpu_error_debugfs_register(struct drm_i915_private *i915
 {
 }
 
+static inline void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915)
+{
+}
+
+static inline void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915)
+{
+}
+
 #endif /* IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) */
 
 #endif /* _I915_GPU_ERROR_H_ */

drivers/gpu/drm/i915/i915_sysfs.c

@@ -155,81 +155,6 @@ static const struct bin_attribute dpf_attrs_1 = {
 	.private = (void *)1
 };
 
-#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
-
-static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
-				struct bin_attribute *attr, char *buf,
-				loff_t off, size_t count)
-{
-
-	struct device *kdev = kobj_to_dev(kobj);
-	struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
-	struct i915_gpu_coredump *gpu;
-	ssize_t ret = 0;
-
-	/*
-	 * FIXME: Concurrent clients triggering resets and reading + clearing
-	 * dumps can cause inconsistent sysfs reads when a user calls in with a
-	 * non-zero offset to complete a prior partial read but the
-	 * gpu_coredump has been cleared or replaced.
-	 */
-
-	gpu = i915_first_error_state(i915);
-	if (IS_ERR(gpu)) {
-		ret = PTR_ERR(gpu);
-	} else if (gpu) {
-		ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count);
-		i915_gpu_coredump_put(gpu);
-	} else {
-		const char *str = "No error state collected\n";
-		size_t len = strlen(str);
-
-		if (off < len) {
-			ret = min_t(size_t, count, len - off);
-			memcpy(buf, str + off, ret);
-		}
-	}
-
-	return ret;
-}
-
-static ssize_t error_state_write(struct file *file, struct kobject *kobj,
-				 struct bin_attribute *attr, char *buf,
-				 loff_t off, size_t count)
-{
-	struct device *kdev = kobj_to_dev(kobj);
-	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
-
-	drm_dbg(&dev_priv->drm, "Resetting error state\n");
-	i915_reset_error_state(dev_priv);
-
-	return count;
-}
-
-static const struct bin_attribute error_state_attr = {
-	.attr.name = "error",
-	.attr.mode = S_IRUSR | S_IWUSR,
-	.size = 0,
-	.read = error_state_read,
-	.write = error_state_write,
-};
-
-static void i915_setup_error_capture(struct device *kdev)
-{
-	if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
-		drm_err(&kdev_minor_to_i915(kdev)->drm,
-			"error_state sysfs setup failed\n");
-}
-
-static void i915_teardown_error_capture(struct device *kdev)
-{
-	sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
-}
-#else
-static void i915_setup_error_capture(struct device *kdev) {}
-static void i915_teardown_error_capture(struct device *kdev) {}
-#endif
-
 void i915_setup_sysfs(struct drm_i915_private *dev_priv)
 {
 	struct device *kdev = dev_priv->drm.primary->kdev;
@@ -255,7 +180,7 @@ void i915_setup_sysfs(struct drm_i915_private *dev_priv)
 		drm_warn(&dev_priv->drm,
 			 "failed to register GT sysfs directory\n");
 
-	i915_setup_error_capture(kdev);
+	i915_gpu_error_sysfs_setup(dev_priv);
 
 	intel_engines_add_sysfs(dev_priv);
 }
@@ -264,7 +189,7 @@ void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
 {
 	struct device *kdev = dev_priv->drm.primary->kdev;
 
-	i915_teardown_error_capture(kdev);
+	i915_gpu_error_sysfs_teardown(dev_priv);
 
 	device_remove_bin_file(kdev,  &dpf_attrs_1);
 	device_remove_bin_file(kdev,  &dpf_attrs);