drm/i915: debugfs interface to manually reset the GPU

Create a /debug/dri/%d/i915_wedged file to display the current wedged
status, and to enable setting that value. On an i965, this will also
trigger a GPU reset.

Useful in order to attempt to recover from some error conditions that
are not currently caught by the automatic hang detection code.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 26bf055..9087c4c 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -27,6 +27,7 @@
  */
 
 #include <linux/seq_file.h>
+#include <linux/debugfs.h>
 #include "drmP.h"
 #include "drm.h"
 #include "i915_drm.h"
@@ -412,6 +413,109 @@ static int i915_registers_info(struct seq_file *m, void *data) {
        return 0;
 }
 
+static int
+i915_wedged_open(struct inode *inode,
+                struct file *filp)
+{
+       filp->private_data = inode->i_private;
+       return 0;
+}
+
+static ssize_t
+i915_wedged_read(struct file *filp,
+                char __user *ubuf,
+                size_t max,
+                loff_t *ppos)
+{
+       struct drm_device *dev = filp->private_data;
+       drm_i915_private_t *dev_priv = dev->dev_private;
+       char buf[80];
+       int len;
+
+       len = snprintf(buf, sizeof (buf),
+                      "wedged :  %d\n",
+                      atomic_read(&dev_priv->mm.wedged));
+
+       return simple_read_from_buffer(ubuf, max, ppos, buf, len);
+}
+
+static ssize_t
+i915_wedged_write(struct file *filp,
+                 const char __user *ubuf,
+                 size_t cnt,
+                 loff_t *ppos)
+{
+       struct drm_device *dev = filp->private_data;
+       drm_i915_private_t *dev_priv = dev->dev_private;
+       char buf[20];
+       int val = 1;
+
+       if (cnt > 0) {
+               if (cnt > sizeof (buf) - 1)
+                       return -EINVAL;
+
+               if (copy_from_user(buf, ubuf, cnt))
+                       return -EFAULT;
+               buf[cnt] = 0;
+
+               val = simple_strtoul(buf, NULL, 0);
+       }
+
+       DRM_INFO("Manually setting wedged to %d\n", val);
+
+       atomic_set(&dev_priv->mm.wedged, val);
+       if (val) {
+               DRM_WAKEUP(&dev_priv->irq_queue);
+               queue_work(dev_priv->wq, &dev_priv->error_work);
+       }
+
+       return cnt;
+}
+
+static const struct file_operations i915_wedged_fops = {
+       .owner = THIS_MODULE,
+       .open = i915_wedged_open,
+       .read = i915_wedged_read,
+       .write = i915_wedged_write,
+};
+
+/* As the drm_debugfs_init() routines are called before dev->dev_private is
+ * allocated we need to hook into the minor for release. */
+static int
+drm_add_fake_info_node(struct drm_minor *minor,
+                      struct dentry *ent,
+                      const void *key)
+{
+       struct drm_info_node *node;
+
+       node = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
+       if (node == NULL) {
+               debugfs_remove(ent);
+               return -ENOMEM;
+       }
+
+       node->minor = minor;
+       node->dent = ent;
+       node->info_ent = (void *) key;
+       list_add(&node->list, &minor->debugfs_nodes.list);
+
+       return 0;
+}
+
+static int i915_wedged_create(struct dentry *root, struct drm_minor *minor)
+{
+       struct drm_device *dev = minor->dev;
+       struct dentry *ent;
+
+       ent = debugfs_create_file("i915_wedged",
+                                 S_IRUGO | S_IWUSR,
+                                 root, dev,
+                                 &i915_wedged_fops);
+       if (IS_ERR(ent))
+               return PTR_ERR(ent);
+
+       return drm_add_fake_info_node(minor, ent, &i915_wedged_fops);
+}
 
 static struct drm_info_list i915_debugfs_list[] = {
        {"i915_regs", i915_registers_info, 0},
@@ -432,6 +536,12 @@ static struct drm_info_list i915_debugfs_list[] = {
 
 int i915_debugfs_init(struct drm_minor *minor)
 {
+       int ret;
+
+       ret = i915_wedged_create(minor->debugfs_root, minor);
+       if (ret)
+               return ret;
+
        return drm_debugfs_create_files(i915_debugfs_list,
                                        I915_DEBUGFS_ENTRIES,
                                        minor->debugfs_root, minor);
@@ -439,9 +549,13 @@ int i915_debugfs_init(struct drm_minor *minor)
 
 void i915_debugfs_cleanup(struct drm_minor *minor)
 {
+       const void *key;
+
        drm_debugfs_remove_files(i915_debugfs_list,
                                 I915_DEBUGFS_ENTRIES, minor);
+
+       key = &i915_wedged_fops;
+       drm_debugfs_remove_files((struct drm_info_list *) &key, 1, minor);
 }
 
 #endif /* CONFIG_DEBUG_FS */
-