1793126fce
Render nodes provide an API for userspace to use non-privileged GPU commands without any running DRM-Master. It is useful for offscreen rendering, GPGPU clients, and normal render clients which do not perform modesetting. Compared to legacy clients, render clients no longer need any authentication to perform client ioctls. Instead, user-space controls render/client access to GPUs via filesystem access-modes on the render-node. Once a render-node was opened, a client has full access to the client/render operations on the GPU. However, no modesetting or ioctls that affect global state are allowed on render nodes. To prevent privilege-escalation, drivers must explicitly state that they support render nodes. They must mark their render-only ioctls as DRM_RENDER_ALLOW so render clients can use them. Furthermore, they must support clients without any attached master. If filesystem access-modes are not enough for fine-grained access control to render nodes (very unlikely, considering the versaitlity of FS-ACLs), you may still fall-back to fd-passing from server to client (which allows arbitrary access-control). However, note that revoking access is currently impossible and unlikely to get implemented. Note: Render clients no longer have any associated DRM-Master as they are supposed to be independent of any server state. DRM core highly depends on file_priv->master to be non-NULL for modesetting/ctx/etc. commands. Therefore, drivers must be very careful to not require DRM-Master if they support DRIVER_RENDER. So far render-nodes are protected by "drm_rnodes". As long as this module-parameter is not set to 1, a driver will not create render nodes. This allows us to experiment with the API a bit before we stabilize it. v2: drop insecure GEM_FLINK to force use of dmabuf Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
130 lines
2.6 KiB
C
130 lines
2.6 KiB
C
#include <drm/drmP.h>
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#include <linux/usb.h>
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#include <linux/module.h>
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int drm_get_usb_dev(struct usb_interface *interface,
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const struct usb_device_id *id,
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struct drm_driver *driver)
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{
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struct drm_device *dev;
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struct usb_device *usbdev;
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int ret;
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DRM_DEBUG("\n");
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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usbdev = interface_to_usbdev(interface);
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dev->usbdev = usbdev;
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dev->dev = &interface->dev;
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mutex_lock(&drm_global_mutex);
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ret = drm_fill_in_dev(dev, NULL, driver);
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if (ret) {
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printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
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goto err_g1;
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}
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usb_set_intfdata(interface, dev);
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ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
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if (ret)
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goto err_g1;
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if (drm_core_check_feature(dev, DRIVER_RENDER) && drm_rnodes) {
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ret = drm_get_minor(dev, &dev->render, DRM_MINOR_RENDER);
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if (ret)
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goto err_g11;
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}
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ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
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if (ret)
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goto err_g2;
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if (dev->driver->load) {
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ret = dev->driver->load(dev, 0);
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if (ret)
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goto err_g3;
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}
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/* setup the grouping for the legacy output */
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ret = drm_mode_group_init_legacy_group(dev,
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&dev->primary->mode_group);
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if (ret)
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goto err_g3;
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list_add_tail(&dev->driver_item, &driver->device_list);
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mutex_unlock(&drm_global_mutex);
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DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
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driver->name, driver->major, driver->minor, driver->patchlevel,
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driver->date, dev->primary->index);
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return 0;
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err_g3:
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drm_put_minor(&dev->primary);
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err_g2:
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if (dev->render)
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drm_put_minor(&dev->render);
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err_g11:
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drm_put_minor(&dev->control);
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err_g1:
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kfree(dev);
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mutex_unlock(&drm_global_mutex);
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return ret;
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}
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EXPORT_SYMBOL(drm_get_usb_dev);
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static int drm_usb_get_irq(struct drm_device *dev)
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{
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return 0;
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}
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static const char *drm_usb_get_name(struct drm_device *dev)
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{
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return "USB";
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}
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static int drm_usb_set_busid(struct drm_device *dev,
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struct drm_master *master)
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{
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return 0;
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}
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static struct drm_bus drm_usb_bus = {
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.bus_type = DRIVER_BUS_USB,
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.get_irq = drm_usb_get_irq,
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.get_name = drm_usb_get_name,
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.set_busid = drm_usb_set_busid,
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};
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int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
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{
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int res;
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DRM_DEBUG("\n");
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INIT_LIST_HEAD(&driver->device_list);
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driver->kdriver.usb = udriver;
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driver->bus = &drm_usb_bus;
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res = usb_register(udriver);
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return res;
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}
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EXPORT_SYMBOL(drm_usb_init);
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void drm_usb_exit(struct drm_driver *driver,
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struct usb_driver *udriver)
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{
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usb_deregister(udriver);
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}
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EXPORT_SYMBOL(drm_usb_exit);
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MODULE_AUTHOR("David Airlie");
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MODULE_DESCRIPTION("USB DRM support");
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MODULE_LICENSE("GPL and additional rights");
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