drm/i915: introduce i915_error_state_buf_init

Make function for struct i915_error_state_buf initialization
and export it, for sysfs and debugfs.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index eef4c01..3e36756 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1028,38 +1028,48 @@ static int i915_error_state_release(struct inode *inode, struct file *file)
        return 0;
 }
 
-static ssize_t i915_error_state_read(struct file *file, char __user *userbuf,
-                                    size_t count, loff_t *pos)
+int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
+                             size_t count, loff_t pos)
 {
-       struct i915_error_state_file_priv *error_priv = file->private_data;
-       struct drm_i915_error_state_buf error_str;
-       loff_t tmp_pos = 0;
-       ssize_t ret_count = 0;
-       int ret = 0;
-
-       memset(&error_str, 0, sizeof(error_str));
+       memset(ebuf, 0, sizeof(*ebuf));
 
        /* We need to have enough room to store any i915_error_state printf
         * so that we can move it to start position.
         */
-       error_str.size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
-       error_str.buf = kmalloc(error_str.size,
+       ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
+       ebuf->buf = kmalloc(ebuf->size,
                                GFP_TEMPORARY | __GFP_NORETRY | __GFP_NOWARN);
 
-       if (error_str.buf == NULL) {
-               error_str.size = PAGE_SIZE;
-               error_str.buf = kmalloc(error_str.size, GFP_TEMPORARY);
+       if (ebuf->buf == NULL) {
+               ebuf->size = PAGE_SIZE;
+               ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
        }
 
-       if (error_str.buf == NULL) {
-               error_str.size = 128;
-               error_str.buf = kmalloc(error_str.size, GFP_TEMPORARY);
+       if (ebuf->buf == NULL) {
+               ebuf->size = 128;
+               ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
        }
 
-       if (error_str.buf == NULL)
+       if (ebuf->buf == NULL)
                return -ENOMEM;
 
-       error_str.start = *pos;
+       ebuf->start = pos;
+
+       return 0;
+}
+
+static ssize_t i915_error_state_read(struct file *file, char __user *userbuf,
+                                    size_t count, loff_t *pos)
+{
+       struct i915_error_state_file_priv *error_priv = file->private_data;
+       struct drm_i915_error_state_buf error_str;
+       loff_t tmp_pos = 0;
+       ssize_t ret_count = 0;
+       int ret;
+
+       ret = i915_error_state_buf_init(&error_str, count, *pos);
+       if (ret)
+               return ret;
 
        ret = i915_error_state_to_str(&error_str, error_priv);
        if (ret)
@@ -1074,7 +1084,7 @@ static ssize_t i915_error_state_read(struct file *file, char __user *userbuf,
        else
                *pos = error_str.start + ret_count;
 out:
-       kfree(error_str.buf);
+       i915_error_state_buf_release(&error_str);
        return ret ?: ret_count;
 }
 

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bc4a84a..a7c2cfb 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1931,6 +1931,13 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *estr,
 void i915_error_state_get(struct drm_device *dev,
                          struct i915_error_state_file_priv *error_priv);
 void i915_error_state_put(struct i915_error_state_file_priv *error_priv);
+int i915_error_state_buf_init(struct drm_i915_error_state_buf *eb,
+                             size_t count, loff_t pos);
+static inline void i915_error_state_buf_release(
+       struct drm_i915_error_state_buf *eb)
+{
+       kfree(eb->buf);
+}
 
 /* i915_suspend.c */
 extern int i915_save_state(struct drm_device *dev);