cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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udl_drv.c (3591B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2012 Red Hat
      4 */
      5
      6#include <linux/module.h>
      7
      8#include <drm/drm_crtc_helper.h>
      9#include <drm/drm_drv.h>
     10#include <drm/drm_fb_helper.h>
     11#include <drm/drm_file.h>
     12#include <drm/drm_gem_shmem_helper.h>
     13#include <drm/drm_managed.h>
     14#include <drm/drm_ioctl.h>
     15#include <drm/drm_probe_helper.h>
     16#include <drm/drm_print.h>
     17
     18#include "udl_drv.h"
     19
     20static int udl_usb_suspend(struct usb_interface *interface,
     21			   pm_message_t message)
     22{
     23	struct drm_device *dev = usb_get_intfdata(interface);
     24
     25	return drm_mode_config_helper_suspend(dev);
     26}
     27
     28static int udl_usb_resume(struct usb_interface *interface)
     29{
     30	struct drm_device *dev = usb_get_intfdata(interface);
     31
     32	return drm_mode_config_helper_resume(dev);
     33}
     34
     35/*
     36 * FIXME: Dma-buf sharing requires DMA support by the importing device.
     37 *        This function is a workaround to make USB devices work as well.
     38 *        See todo.rst for how to fix the issue in the dma-buf framework.
     39 */
     40static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
     41							  struct dma_buf *dma_buf)
     42{
     43	struct udl_device *udl = to_udl(dev);
     44
     45	if (!udl->dmadev)
     46		return ERR_PTR(-ENODEV);
     47
     48	return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
     49}
     50
     51DEFINE_DRM_GEM_FOPS(udl_driver_fops);
     52
     53static const struct drm_driver driver = {
     54	.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
     55
     56	/* GEM hooks */
     57	.fops = &udl_driver_fops,
     58	DRM_GEM_SHMEM_DRIVER_OPS,
     59	.gem_prime_import = udl_driver_gem_prime_import,
     60
     61	.name = DRIVER_NAME,
     62	.desc = DRIVER_DESC,
     63	.date = DRIVER_DATE,
     64	.major = DRIVER_MAJOR,
     65	.minor = DRIVER_MINOR,
     66	.patchlevel = DRIVER_PATCHLEVEL,
     67};
     68
     69static struct udl_device *udl_driver_create(struct usb_interface *interface)
     70{
     71	struct udl_device *udl;
     72	int r;
     73
     74	udl = devm_drm_dev_alloc(&interface->dev, &driver,
     75				 struct udl_device, drm);
     76	if (IS_ERR(udl))
     77		return udl;
     78
     79	r = udl_init(udl);
     80	if (r)
     81		return ERR_PTR(r);
     82
     83	usb_set_intfdata(interface, udl);
     84
     85	return udl;
     86}
     87
     88static int udl_usb_probe(struct usb_interface *interface,
     89			 const struct usb_device_id *id)
     90{
     91	int r;
     92	struct udl_device *udl;
     93
     94	udl = udl_driver_create(interface);
     95	if (IS_ERR(udl))
     96		return PTR_ERR(udl);
     97
     98	r = drm_dev_register(&udl->drm, 0);
     99	if (r)
    100		return r;
    101
    102	DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
    103
    104	drm_fbdev_generic_setup(&udl->drm, 0);
    105
    106	return 0;
    107}
    108
    109static void udl_usb_disconnect(struct usb_interface *interface)
    110{
    111	struct drm_device *dev = usb_get_intfdata(interface);
    112
    113	drm_kms_helper_poll_fini(dev);
    114	udl_drop_usb(dev);
    115	drm_dev_unplug(dev);
    116}
    117
    118/*
    119 * There are many DisplayLink-based graphics products, all with unique PIDs.
    120 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
    121 * We also require a match on SubClass (0x00) and Protocol (0x00),
    122 * which is compatible with all known USB 2.0 era graphics chips and firmware,
    123 * but allows DisplayLink to increment those for any future incompatible chips
    124 */
    125static const struct usb_device_id id_table[] = {
    126	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
    127	 .bInterfaceSubClass = 0x00,
    128	 .bInterfaceProtocol = 0x00,
    129	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
    130			USB_DEVICE_ID_MATCH_INT_CLASS |
    131			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
    132			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
    133	{},
    134};
    135MODULE_DEVICE_TABLE(usb, id_table);
    136
    137static struct usb_driver udl_driver = {
    138	.name = "udl",
    139	.probe = udl_usb_probe,
    140	.disconnect = udl_usb_disconnect,
    141	.suspend = udl_usb_suspend,
    142	.resume = udl_usb_resume,
    143	.id_table = id_table,
    144};
    145module_usb_driver(udl_driver);
    146MODULE_LICENSE("GPL");