linux_dsm_epyc7002/drivers/gpu/drm/udl/udl_main.c
Thomas Gleixner 12eb90f1ed treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 262
Based on 1 normalized pattern(s):

  this file is subject to the terms and conditions of the gnu general
  public license v2 see the file copying in the main directory of this
  archive for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 11 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141333.582369016@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:30:28 +02:00

371 lines
8.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*
* based in parts on udlfb.c:
* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
*/
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_probe_helper.h>
#include "udl_drv.h"
/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
#define BULK_SIZE 512
#define NR_USB_REQUEST_CHANNEL 0x12
#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
#define WRITES_IN_FLIGHT (4)
#define MAX_VENDOR_DESCRIPTOR_SIZE 256
#define GET_URB_TIMEOUT HZ
#define FREE_URB_TIMEOUT (HZ*2)
static int udl_parse_vendor_descriptor(struct drm_device *dev,
struct usb_device *usbdev)
{
struct udl_device *udl = to_udl(dev);
char *desc;
char *buf;
char *desc_end;
u8 total_len = 0;
buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
if (!buf)
return false;
desc = buf;
total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
if (total_len > 5) {
DRM_INFO("vendor descriptor length:%x data:%11ph\n",
total_len, desc);
if ((desc[0] != total_len) || /* descriptor length */
(desc[1] != 0x5f) || /* vendor descriptor type */
(desc[2] != 0x01) || /* version (2 bytes) */
(desc[3] != 0x00) ||
(desc[4] != total_len - 2)) /* length after type */
goto unrecognized;
desc_end = desc + total_len;
desc += 5; /* the fixed header we've already parsed */
while (desc < desc_end) {
u8 length;
u16 key;
key = le16_to_cpu(*((u16 *) desc));
desc += sizeof(u16);
length = *desc;
desc++;
switch (key) {
case 0x0200: { /* max_area */
u32 max_area;
max_area = le32_to_cpu(*((u32 *)desc));
DRM_DEBUG("DL chip limited to %d pixel modes\n",
max_area);
udl->sku_pixel_limit = max_area;
break;
}
default:
break;
}
desc += length;
}
}
goto success;
unrecognized:
/* allow udlfb to load for now even if firmware unrecognized */
DRM_ERROR("Unrecognized vendor firmware descriptor\n");
success:
kfree(buf);
return true;
}
/*
* Need to ensure a channel is selected before submitting URBs
*/
static int udl_select_std_channel(struct udl_device *udl)
{
int ret;
static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
0x1C, 0x88, 0x5E, 0x15,
0x60, 0xFE, 0xC6, 0x97,
0x16, 0x3D, 0x47, 0xF2};
void *sendbuf;
sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
if (!sendbuf)
return -ENOMEM;
ret = usb_control_msg(udl->udev,
usb_sndctrlpipe(udl->udev, 0),
NR_USB_REQUEST_CHANNEL,
(USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
sendbuf, sizeof(set_def_chn),
USB_CTRL_SET_TIMEOUT);
kfree(sendbuf);
return ret < 0 ? ret : 0;
}
static void udl_release_urb_work(struct work_struct *work)
{
struct urb_node *unode = container_of(work, struct urb_node,
release_urb_work.work);
up(&unode->dev->urbs.limit_sem);
}
void udl_urb_completion(struct urb *urb)
{
struct urb_node *unode = urb->context;
struct udl_device *udl = unode->dev;
unsigned long flags;
/* sync/async unlink faults aren't errors */
if (urb->status) {
if (!(urb->status == -ENOENT ||
urb->status == -ECONNRESET ||
urb->status == -ESHUTDOWN)) {
DRM_ERROR("%s - nonzero write bulk status received: %d\n",
__func__, urb->status);
atomic_set(&udl->lost_pixels, 1);
}
}
urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
spin_lock_irqsave(&udl->urbs.lock, flags);
list_add_tail(&unode->entry, &udl->urbs.list);
udl->urbs.available++;
spin_unlock_irqrestore(&udl->urbs.lock, flags);
#if 0
/*
* When using fb_defio, we deadlock if up() is called
* while another is waiting. So queue to another process.
*/
if (fb_defio)
schedule_delayed_work(&unode->release_urb_work, 0);
else
#endif
up(&udl->urbs.limit_sem);
}
static void udl_free_urb_list(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
int count = udl->urbs.count;
struct list_head *node;
struct urb_node *unode;
struct urb *urb;
DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
/* keep waiting and freeing, until we've got 'em all */
while (count--) {
down(&udl->urbs.limit_sem);
spin_lock_irq(&udl->urbs.lock);
node = udl->urbs.list.next; /* have reserved one with sem */
list_del_init(node);
spin_unlock_irq(&udl->urbs.lock);
unode = list_entry(node, struct urb_node, entry);
urb = unode->urb;
/* Free each separately allocated piece */
usb_free_coherent(urb->dev, udl->urbs.size,
urb->transfer_buffer, urb->transfer_dma);
usb_free_urb(urb);
kfree(node);
}
udl->urbs.count = 0;
}
static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
{
struct udl_device *udl = to_udl(dev);
struct urb *urb;
struct urb_node *unode;
char *buf;
size_t wanted_size = count * size;
spin_lock_init(&udl->urbs.lock);
retry:
udl->urbs.size = size;
INIT_LIST_HEAD(&udl->urbs.list);
sema_init(&udl->urbs.limit_sem, 0);
udl->urbs.count = 0;
udl->urbs.available = 0;
while (udl->urbs.count * size < wanted_size) {
unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
if (!unode)
break;
unode->dev = udl;
INIT_DELAYED_WORK(&unode->release_urb_work,
udl_release_urb_work);
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(unode);
break;
}
unode->urb = urb;
buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
kfree(unode);
usb_free_urb(urb);
if (size > PAGE_SIZE) {
size /= 2;
udl_free_urb_list(dev);
goto retry;
}
break;
}
/* urb->transfer_buffer_length set to actual before submit */
usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
buf, size, udl_urb_completion, unode);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
list_add_tail(&unode->entry, &udl->urbs.list);
up(&udl->urbs.limit_sem);
udl->urbs.count++;
udl->urbs.available++;
}
DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
return udl->urbs.count;
}
struct urb *udl_get_urb(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
int ret = 0;
struct list_head *entry;
struct urb_node *unode;
struct urb *urb = NULL;
/* Wait for an in-flight buffer to complete and get re-queued */
ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
if (ret) {
atomic_set(&udl->lost_pixels, 1);
DRM_INFO("wait for urb interrupted: %x available: %d\n",
ret, udl->urbs.available);
goto error;
}
spin_lock_irq(&udl->urbs.lock);
BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
entry = udl->urbs.list.next;
list_del_init(entry);
udl->urbs.available--;
spin_unlock_irq(&udl->urbs.lock);
unode = list_entry(entry, struct urb_node, entry);
urb = unode->urb;
error:
return urb;
}
int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
{
struct udl_device *udl = to_udl(dev);
int ret;
BUG_ON(len > udl->urbs.size);
urb->transfer_buffer_length = len; /* set to actual payload len */
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret) {
udl_urb_completion(urb); /* because no one else will */
atomic_set(&udl->lost_pixels, 1);
DRM_ERROR("usb_submit_urb error %x\n", ret);
}
return ret;
}
int udl_init(struct udl_device *udl)
{
struct drm_device *dev = &udl->drm;
int ret = -ENOMEM;
DRM_DEBUG("\n");
mutex_init(&udl->gem_lock);
if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
ret = -ENODEV;
DRM_ERROR("firmware not recognized. Assume incompatible device\n");
goto err;
}
if (udl_select_std_channel(udl))
DRM_ERROR("Selecting channel failed\n");
if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
DRM_ERROR("udl_alloc_urb_list failed\n");
goto err;
}
DRM_DEBUG("\n");
ret = udl_modeset_init(dev);
if (ret)
goto err;
ret = udl_fbdev_init(dev);
if (ret)
goto err;
drm_kms_helper_poll_init(dev);
return 0;
err:
if (udl->urbs.count)
udl_free_urb_list(dev);
DRM_ERROR("%d\n", ret);
return ret;
}
int udl_drop_usb(struct drm_device *dev)
{
udl_free_urb_list(dev);
return 0;
}
void udl_fini(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
drm_kms_helper_poll_fini(dev);
if (udl->urbs.count)
udl_free_urb_list(dev);
udl_fbdev_cleanup(dev);
}