udl_main.c
/*
* 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>
*
* 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.
*/
#include "drmP.h"
#include "udl_drv.h"
/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
#define BULK_SIZE 512
#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 = dev->dev_private;
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:%02x %02x %02x %02x" \
"%02x %02x %02x %02x %02x %02x %02x\n",
total_len, desc[0],
desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
desc[7], desc[8], desc[9], desc[10]);
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;
}
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 = dev->dev_private;
int count = udl->urbs.count;
struct list_head *node;
struct urb_node *unode;
struct urb *urb;
int ret;
unsigned long flags;
DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
/* keep waiting and freeing, until we've got 'em all */
while (count--) {
/* Getting interrupted means a leak, but ok at shutdown*/
ret = down_interruptible(&udl->urbs.limit_sem);
if (ret)
break;
spin_lock_irqsave(&udl->urbs.lock, flags);
node = udl->urbs.list.next; /* have reserved one with sem */
list_del_init(node);
spin_unlock_irqrestore(&udl->urbs.lock, flags);
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 = dev->dev_private;
int i = 0;
struct urb *urb;
struct urb_node *unode;
char *buf;
spin_lock_init(&udl->urbs.lock);
udl->urbs.size = size;
INIT_LIST_HEAD(&udl->urbs.list);
while (i < count) {
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->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
&urb->transfer_dma);
if (!buf) {
kfree(unode);
usb_free_urb(urb);
break;
}
/* urb->transfer_buffer_length set to actual before submit */
usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
buf, size, udl_urb_completion, unode);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
list_add_tail(&unode->entry, &udl->urbs.list);
i++;
}
sema_init(&udl->urbs.limit_sem, i);
udl->urbs.count = i;
udl->urbs.available = i;
DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
return i;
}
struct urb *udl_get_urb(struct drm_device *dev)
{
struct udl_device *udl = dev->dev_private;
int ret = 0;
struct list_head *entry;
struct urb_node *unode;
struct urb *urb = NULL;
unsigned long flags;
/* 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_irqsave(&udl->urbs.lock, flags);
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_irqrestore(&udl->urbs.lock, flags);
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 = dev->dev_private;
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_driver_load(struct drm_device *dev, unsigned long flags)
{
struct udl_device *udl;
int ret;
DRM_DEBUG("\n");
udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
if (!udl)
return -ENOMEM;
udl->ddev = dev;
dev->dev_private = udl;
if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
DRM_ERROR("firmware not recognized. Assume incompatible device\n");
goto err;
}
if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
ret = -ENOMEM;
DRM_ERROR("udl_alloc_urb_list failed\n");
goto err;
}
DRM_DEBUG("\n");
ret = udl_modeset_init(dev);
ret = udl_fbdev_init(dev);
return 0;
err:
kfree(udl);
DRM_ERROR("%d\n", ret);
return ret;
}
int udl_drop_usb(struct drm_device *dev)
{
udl_free_urb_list(dev);
return 0;
}
int udl_driver_unload(struct drm_device *dev)
{
struct udl_device *udl = dev->dev_private;
if (udl->urbs.count)
udl_free_urb_list(dev);
udl_fbdev_cleanup(dev);
udl_modeset_cleanup(dev);
kfree(udl);
return 0;
}