LXR linux/drivers/gpu/drm/udl/udl

   1/*
   2 * Copyright (C) 2012 Red Hat
   3 *
   4 * based in parts on udlfb.c:
   5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
   6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
   7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
   8 *
   9 * This file is subject to the terms and conditions of the GNU General Public
  10 * License v2. See the file COPYING in the main directory of this archive for
  11 * more details.
  12 */
  13#include <drm/drmP.h>
  14#include "udl_drv.h"
  15
  16/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
  17#define BULK_SIZE 512
  18
  19#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
  20#define WRITES_IN_FLIGHT (4)
  21#define MAX_VENDOR_DESCRIPTOR_SIZE 256
  22
  23#define GET_URB_TIMEOUT HZ
  24#define FREE_URB_TIMEOUT (HZ*2)
  25
  26static int udl_parse_vendor_descriptor(struct drm_device *dev,
  27                                       struct usb_device *usbdev)
  28{
  29        struct udl_device *udl = dev->dev_private;
  30        char *desc;
  31        char *buf;
  32        char *desc_end;
  33
  34        u8 total_len = 0;
  35
  36        buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
  37        if (!buf)
  38                return false;
  39        desc = buf;
  40
  41        total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
  42                                    0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
  43        if (total_len > 5) {
  44                DRM_INFO("vendor descriptor length:%x data:%11ph\n",
  45                        total_len, desc);
  46
  47                if ((desc[0] != total_len) || /* descriptor length */
  48                    (desc[1] != 0x5f) ||   /* vendor descriptor type */
  49                    (desc[2] != 0x01) ||   /* version (2 bytes) */
  50                    (desc[3] != 0x00) ||
  51                    (desc[4] != total_len - 2)) /* length after type */
  52                        goto unrecognized;
  53
  54                desc_end = desc + total_len;
  55                desc += 5; /* the fixed header we've already parsed */
  56
  57                while (desc < desc_end) {
  58                        u8 length;
  59                        u16 key;
  60
  61                        key = le16_to_cpu(*((u16 *) desc));
  62                        desc += sizeof(u16);
  63                        length = *desc;
  64                        desc++;
  65
  66                        switch (key) {
  67                        case 0x0200: { /* max_area */
  68                                u32 max_area;
  69                                max_area = le32_to_cpu(*((u32 *)desc));
  70                                DRM_DEBUG("DL chip limited to %d pixel modes\n",
  71                                        max_area);
  72                                udl->sku_pixel_limit = max_area;
  73                                break;
  74                        }
  75                        default:
  76                                break;
  77                        }
  78                        desc += length;
  79                }
  80        }
  81
  82        goto success;
  83
  84unrecognized:
  85        /* allow udlfb to load for now even if firmware unrecognized */
  86        DRM_ERROR("Unrecognized vendor firmware descriptor\n");
  87
  88success:
  89        kfree(buf);
  90        return true;
  91}
  92
  93static void udl_release_urb_work(struct work_struct *work)
  94{
  95        struct urb_node *unode = container_of(work, struct urb_node,
  96                                              release_urb_work.work);
  97
  98        up(&unode->dev->urbs.limit_sem);
  99}
 100
 101void udl_urb_completion(struct urb *urb)
 102{
 103        struct urb_node *unode = urb->context;
 104        struct udl_device *udl = unode->dev;
 105        unsigned long flags;
 106
 107        /* sync/async unlink faults aren't errors */
 108        if (urb->status) {
 109                if (!(urb->status == -ENOENT ||
 110                    urb->status == -ECONNRESET ||
 111                    urb->status == -ESHUTDOWN)) {
 112                        DRM_ERROR("%s - nonzero write bulk status received: %d\n",
 113                                __func__, urb->status);
 114                        atomic_set(&udl->lost_pixels, 1);
 115                }
 116        }
 117
 118        urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
 119
 120        spin_lock_irqsave(&udl->urbs.lock, flags);
 121        list_add_tail(&unode->entry, &udl->urbs.list);
 122        udl->urbs.available++;
 123        spin_unlock_irqrestore(&udl->urbs.lock, flags);
 124
 125#if 0
 126        /*
 127         * When using fb_defio, we deadlock if up() is called
 128         * while another is waiting. So queue to another process.
 129         */
 130        if (fb_defio)
 131                schedule_delayed_work(&unode->release_urb_work, 0);
 132        else
 133#endif
 134                up(&udl->urbs.limit_sem);
 135}
 136
 137static void udl_free_urb_list(struct drm_device *dev)
 138{
 139        struct udl_device *udl = dev->dev_private;
 140        int count = udl->urbs.count;
 141        struct list_head *node;
 142        struct urb_node *unode;
 143        struct urb *urb;
 144        int ret;
 145        unsigned long flags;
 146
 147        DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
 148
 149        /* keep waiting and freeing, until we've got 'em all */
 150        while (count--) {
 151
 152                /* Getting interrupted means a leak, but ok at shutdown*/
 153                ret = down_interruptible(&udl->urbs.limit_sem);
 154                if (ret)
 155                        break;
 156
 157                spin_lock_irqsave(&udl->urbs.lock, flags);
 158
 159                node = udl->urbs.list.next; /* have reserved one with sem */
 160                list_del_init(node);
 161
 162                spin_unlock_irqrestore(&udl->urbs.lock, flags);
 163
 164                unode = list_entry(node, struct urb_node, entry);
 165                urb = unode->urb;
 166
 167                /* Free each separately allocated piece */
 168                usb_free_coherent(urb->dev, udl->urbs.size,
 169                                  urb->transfer_buffer, urb->transfer_dma);
 170                usb_free_urb(urb);
 171                kfree(node);
 172        }
 173        udl->urbs.count = 0;
 174}
 175
 176static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
 177{
 178        struct udl_device *udl = dev->dev_private;
 179        int i = 0;
 180        struct urb *urb;
 181        struct urb_node *unode;
 182        char *buf;
 183
 184        spin_lock_init(&udl->urbs.lock);
 185
 186        udl->urbs.size = size;
 187        INIT_LIST_HEAD(&udl->urbs.list);
 188
 189        while (i < count) {
 190                unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
 191                if (!unode)
 192                        break;
 193                unode->dev = udl;
 194
 195                INIT_DELAYED_WORK(&unode->release_urb_work,
 196                          udl_release_urb_work);
 197
 198                urb = usb_alloc_urb(0, GFP_KERNEL);
 199                if (!urb) {
 200                        kfree(unode);
 201                        break;
 202                }
 203                unode->urb = urb;
 204
 205                buf = usb_alloc_coherent(udl->udev, MAX_TRANSFER, GFP_KERNEL,
 206                                         &urb->transfer_dma);
 207                if (!buf) {
 208                        kfree(unode);
 209                        usb_free_urb(urb);
 210                        break;
 211                }
 212
 213                /* urb->transfer_buffer_length set to actual before submit */
 214                usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
 215                        buf, size, udl_urb_completion, unode);
 216                urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 217
 218                list_add_tail(&unode->entry, &udl->urbs.list);
 219
 220                i++;
 221        }
 222
 223        sema_init(&udl->urbs.limit_sem, i);
 224        udl->urbs.count = i;
 225        udl->urbs.available = i;
 226
 227        DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
 228
 229        return i;
 230}
 231
 232struct urb *udl_get_urb(struct drm_device *dev)
 233{
 234        struct udl_device *udl = dev->dev_private;
 235        int ret = 0;
 236        struct list_head *entry;
 237        struct urb_node *unode;
 238        struct urb *urb = NULL;
 239        unsigned long flags;
 240
 241        /* Wait for an in-flight buffer to complete and get re-queued */
 242        ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
 243        if (ret) {
 244                atomic_set(&udl->lost_pixels, 1);
 245                DRM_INFO("wait for urb interrupted: %x available: %d\n",
 246                       ret, udl->urbs.available);
 247                goto error;
 248        }
 249
 250        spin_lock_irqsave(&udl->urbs.lock, flags);
 251
 252        BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
 253        entry = udl->urbs.list.next;
 254        list_del_init(entry);
 255        udl->urbs.available--;
 256
 257        spin_unlock_irqrestore(&udl->urbs.lock, flags);
 258
 259        unode = list_entry(entry, struct urb_node, entry);
 260        urb = unode->urb;
 261
 262error:
 263        return urb;
 264}
 265
 266int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
 267{
 268        struct udl_device *udl = dev->dev_private;
 269        int ret;
 270
 271        BUG_ON(len > udl->urbs.size);
 272
 273        urb->transfer_buffer_length = len; /* set to actual payload len */
 274        ret = usb_submit_urb(urb, GFP_ATOMIC);
 275        if (ret) {
 276                udl_urb_completion(urb); /* because no one else will */
 277                atomic_set(&udl->lost_pixels, 1);
 278                DRM_ERROR("usb_submit_urb error %x\n", ret);
 279        }
 280        return ret;
 281}
 282
 283int udl_driver_load(struct drm_device *dev, unsigned long flags)
 284{
 285        struct usb_device *udev = (void*)flags;
 286        struct udl_device *udl;
 287        int ret = -ENOMEM;
 288
 289        DRM_DEBUG("\n");
 290        udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
 291        if (!udl)
 292                return -ENOMEM;
 293
 294        udl->udev = udev;
 295        udl->ddev = dev;
 296        dev->dev_private = udl;
 297
 298        if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
 299                ret = -ENODEV;
 300                DRM_ERROR("firmware not recognized. Assume incompatible device\n");
 301                goto err;
 302        }
 303
 304        if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
 305                DRM_ERROR("udl_alloc_urb_list failed\n");
 306                goto err;
 307        }
 308
 309        DRM_DEBUG("\n");
 310        ret = udl_modeset_init(dev);
 311        if (ret)
 312                goto err;
 313
 314        ret = udl_fbdev_init(dev);
 315        if (ret)
 316                goto err;
 317
 318        ret = drm_vblank_init(dev, 1);
 319        if (ret)
 320                goto err_fb;
 321
 322        return 0;
 323err_fb:
 324        udl_fbdev_cleanup(dev);
 325err:
 326        if (udl->urbs.count)
 327                udl_free_urb_list(dev);
 328        kfree(udl);
 329        DRM_ERROR("%d\n", ret);
 330        return ret;
 331}
 332
 333int udl_drop_usb(struct drm_device *dev)
 334{
 335        udl_free_urb_list(dev);
 336        return 0;
 337}
 338
 339int udl_driver_unload(struct drm_device *dev)
 340{
 341        struct udl_device *udl = dev->dev_private;
 342
 343        drm_vblank_cleanup(dev);
 344
 345        if (udl->urbs.count)
 346                udl_free_urb_list(dev);
 347
 348        udl_fbdev_cleanup(dev);
 349        udl_modeset_cleanup(dev);
 350        kfree(udl);
 351        return 0;
 352}
 353