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// 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/drm.h>
#include <drm/drm_print.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 (20)
#define MAX_VENDOR_DESCRIPTOR_SIZE 256
static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout);
static int udl_parse_vendor_descriptor(struct udl_device *udl)
{
struct usb_device *udev = udl_to_usb_device(udl);
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(udev, 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
*/
int udl_select_std_channel(struct udl_device *udl)
{
static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
0x1C, 0x88, 0x5E, 0x15,
0x60, 0xFE, 0xC6, 0x97,
0x16, 0x3D, 0x47, 0xF2};
void *sendbuf;
int ret;
struct usb_device *udev = udl_to_usb_device(udl);
sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
if (!sendbuf)
return -ENOMEM;
ret = usb_control_msg(udev, usb_sndctrlpipe(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;
}
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 == -EPROTO ||
urb->status == -ESHUTDOWN)) {
DRM_ERROR("%s - nonzero write bulk status received: %d\n",
__func__, urb->status);
}
}
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);
wake_up(&udl->urbs.sleep);
}
static void udl_free_urb_list(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
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 (udl->urbs.count) {
spin_lock_irq(&udl->urbs.lock);
urb = udl_get_urb_locked(udl, MAX_SCHEDULE_TIMEOUT);
udl->urbs.count--;
spin_unlock_irq(&udl->urbs.lock);
if (WARN_ON(!urb))
break;
unode = urb->context;
/* Free each separately allocated piece */
usb_free_coherent(urb->dev, udl->urbs.size,
urb->transfer_buffer, urb->transfer_dma);
usb_free_urb(urb);
kfree(unode);
}
wake_up_all(&udl->urbs.sleep);
}
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;
struct usb_device *udev = udl_to_usb_device(udl);
spin_lock_init(&udl->urbs.lock);
INIT_LIST_HEAD(&udl->urbs.list);
init_waitqueue_head(&udl->urbs.sleep);
udl->urbs.count = 0;
udl->urbs.available = 0;
retry:
udl->urbs.size = size;
while (udl->urbs.count * size < wanted_size) {
unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
if (!unode)
break;
unode->dev = udl;
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
kfree(unode);
break;
}
unode->urb = urb;
buf = usb_alloc_coherent(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, udev, usb_sndbulkpipe(udev, 1),
buf, size, udl_urb_completion, unode);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
list_add_tail(&unode->entry, &udl->urbs.list);
udl->urbs.count++;
udl->urbs.available++;
}
DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
return udl->urbs.count;
}
static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout)
{
struct urb_node *unode;
assert_spin_locked(&udl->urbs.lock);
/* Wait for an in-flight buffer to complete and get re-queued */
if (!wait_event_lock_irq_timeout(udl->urbs.sleep,
!udl->urbs.count ||
!list_empty(&udl->urbs.list),
udl->urbs.lock, timeout)) {
DRM_INFO("wait for urb interrupted: available: %d\n",
udl->urbs.available);
return NULL;
}
if (!udl->urbs.count)
return NULL;
unode = list_first_entry(&udl->urbs.list, struct urb_node, entry);
list_del_init(&unode->entry);
udl->urbs.available--;
return unode->urb;
}
#define GET_URB_TIMEOUT HZ
struct urb *udl_get_urb(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
struct urb *urb;
spin_lock_irq(&udl->urbs.lock);
urb = udl_get_urb_locked(udl, GET_URB_TIMEOUT);
spin_unlock_irq(&udl->urbs.lock);
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;
if (WARN_ON(len > udl->urbs.size)) {
ret = -EINVAL;
goto error;
}
urb->transfer_buffer_length = len; /* set to actual payload len */
ret = usb_submit_urb(urb, GFP_ATOMIC);
error:
if (ret) {
udl_urb_completion(urb); /* because no one else will */
DRM_ERROR("usb_submit_urb error %x\n", ret);
}
return ret;
}
/* wait until all pending URBs have been processed */
void udl_sync_pending_urbs(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
spin_lock_irq(&udl->urbs.lock);
/* 2 seconds as a sane timeout */
if (!wait_event_lock_irq_timeout(udl->urbs.sleep,
udl->urbs.available == udl->urbs.count,
udl->urbs.lock,
msecs_to_jiffies(2000)))
drm_err(dev, "Timeout for syncing pending URBs\n");
spin_unlock_irq(&udl->urbs.lock);
}
int udl_init(struct udl_device *udl)
{
struct drm_device *dev = &udl->drm;
int ret = -ENOMEM;
DRM_DEBUG("\n");
udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));
if (!udl->dmadev)
drm_warn(dev, "buffer sharing not supported"); /* not an error */
mutex_init(&udl->gem_lock);
if (!udl_parse_vendor_descriptor(udl)) {
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;
drm_kms_helper_poll_init(dev);
return 0;
err:
if (udl->urbs.count)
udl_free_urb_list(dev);
put_device(udl->dmadev);
DRM_ERROR("%d\n", ret);
return ret;
}
int udl_drop_usb(struct drm_device *dev)
{
struct udl_device *udl = to_udl(dev);
udl_free_urb_list(dev);
put_device(udl->dmadev);
udl->dmadev = NULL;
return 0;
}