vmwgfx: Wrap drm_read and drm_poll

Make sure the device is processing the fifo when these functions are
called in case they might sleep waiting for an event.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 5e1994a..e07dcf4 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -1085,7 +1085,8 @@ static struct drm_driver driver = {
                 .release = drm_release,
                 .unlocked_ioctl = vmw_unlocked_ioctl,
                 .mmap = vmw_mmap,
-                .poll = drm_poll,
+                .poll = vmw_fops_poll,
+                .read = vmw_fops_read,
                 .fasync = drm_fasync,
 #if defined(CONFIG_COMPAT)
                 .compat_ioctl = drm_compat_ioctl,

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 83b2563..0e9b2ce 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -469,6 +469,10 @@ extern int vmw_present_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv);
 extern int vmw_present_readback_ioctl(struct drm_device *dev, void *data,
                                      struct drm_file *file_priv);
+extern unsigned int vmw_fops_poll(struct file *filp,
+                                 struct poll_table_struct *wait);
+extern ssize_t vmw_fops_read(struct file *filp, char __user *buffer,
+                            size_t count, loff_t *offset);
 
 /**
  * Fifo utilities - vmwgfx_fifo.c

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
index c0284a4..97f23ab 100644 (file)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
@@ -282,3 +282,46 @@ out_no_copy:
 out_clips:
        return ret;
 }
+
+
+/**
+ * vmw_fops_poll - wrapper around the drm_poll function
+ *
+ * @filp: See the linux fops poll documentation.
+ * @wait: See the linux fops poll documentation.
+ *
+ * Wrapper around the drm_poll function that makes sure the device is
+ * processing the fifo if drm_poll decides to wait.
+ */
+unsigned int vmw_fops_poll(struct file *filp, struct poll_table_struct *wait)
+{
+       struct drm_file *file_priv = filp->private_data;
+       struct vmw_private *dev_priv =
+               vmw_priv(file_priv->minor->dev);
+
+       vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
+       return drm_poll(filp, wait);
+}
+
+
+/**
+ * vmw_fops_read - wrapper around the drm_read function
+ *
+ * @filp: See the linux fops read documentation.
+ * @buffer: See the linux fops read documentation.
+ * @count: See the linux fops read documentation.
+ * offset: See the linux fops read documentation.
+ *
+ * Wrapper around the drm_read function that makes sure the device is
+ * processing the fifo if drm_read decides to wait.
+ */
+ssize_t vmw_fops_read(struct file *filp, char __user *buffer,
+                     size_t count, loff_t *offset)
+{
+       struct drm_file *file_priv = filp->private_data;
+       struct vmw_private *dev_priv =
+               vmw_priv(file_priv->minor->dev);
+
+       vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
+       return drm_read(filp, buffer, count, offset);
+}