@@ -843,6 +843,86 @@ static const struct file_operations i915_error_state_fops = {
.release = i915_error_state_release,
};
+static ssize_t
+i915_next_seqno_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;
+ int ret;
+
+ ret = mutex_lock_interruptible(&dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ len = snprintf(buf, sizeof(buf),
+ "next_seqno : 0x%x\n",
+ dev_priv->next_seqno);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ if (len > sizeof(buf))
+ len = sizeof(buf);
+
+ return simple_read_from_buffer(ubuf, max, ppos, buf, len);
+}
+
+static ssize_t
+i915_next_seqno_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];
+ u32 val = 1;
+ int ret;
+
+ if (cnt > 0) {
+ if (cnt > sizeof(buf) - 1)
+ return -EINVAL;
+
+ if (copy_from_user(buf, ubuf, cnt))
+ return -EFAULT;
+ buf[cnt] = 0;
+
+ ret = kstrtouint(buf, 0, &val);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (val == 0)
+ return -EINVAL;
+
+ ret = mutex_lock_interruptible(&dev->struct_mutex);
+ if (ret)
+ return ret;
+
+ if (i915_seqno_passed(val, dev_priv->next_seqno)) {
+ dev_priv->next_seqno = val;
+ DRM_DEBUG_DRIVER("Advancing seqno to %u\n", val);
+ } else {
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return ret ?: cnt;
+}
+
+static const struct file_operations i915_next_seqno_fops = {
+ .owner = THIS_MODULE,
+ .open = simple_open,
+ .read = i915_next_seqno_read,
+ .write = i915_next_seqno_write,
+ .llseek = default_llseek,
+};
+
static int i915_rstdby_delays(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *) m->private;
@@ -2107,6 +2187,12 @@ int i915_debugfs_init(struct drm_minor *minor)
if (ret)
return ret;
+ ret = i915_debugfs_create(minor->debugfs_root, minor,
+ "i915_next_seqno",
+ &i915_next_seqno_fops);
+ if (ret)
+ return ret;
+
return drm_debugfs_create_files(i915_debugfs_list,
I915_DEBUGFS_ENTRIES,
minor->debugfs_root, minor);
This is needed for testing seqno wrapping. Be careful to not bump next_seqno more than 0x7FFFFFFF at a time (between some handled requests) as i915_seqno_passed() can't handle bigger difference in between. v2: Address review comments from Chris Wilson. Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com> --- drivers/gpu/drm/i915/i915_debugfs.c | 86 +++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+)