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 "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:%02x %02x %02x %02x" \
  45                        "%02x %02x %02x %02x %02x %02x %02x\n",
  46                        total_len, desc[0],
  47                        desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
  48                        desc[7], desc[8], desc[9], desc[10]);
  49
  50                if ((desc[0] != total_len) || /* descriptor length */
  51                    (desc[1] != 0x5f) ||   /* vendor descriptor type */
  52                    (desc[2] != 0x01) ||   /* version (2 bytes) */
  53                    (desc[3] != 0x00) ||
  54                    (desc[4] != total_len - 2)) /* length after type */
  55                        goto unrecognized;
  56
  57                desc_end = desc + total_len;
  58                desc += 5; /* the fixed header we've already parsed */
  59
  60                while (desc < desc_end) {
  61                        u8 length;
  62                        u16 key;
  63
  64                        key = le16_to_cpu(*((u16 *) desc));
  65                        desc += sizeof(u16);
  66                        length = *desc;
  67                        desc++;
  68
  69                        switch (key) {
  70                        case 0x0200: { /* max_area */
  71                                u32 max_area;
  72                                max_area = le32_to_cpu(*((u32 *)desc));
  73                                DRM_DEBUG("DL chip limited to %d pixel modes\n",
  74                                        max_area);
  75                                udl->sku_pixel_limit = max_area;
  76                                break;
  77                        }
  78                        default:
  79                                break;
  80                        }
  81                        desc += length;
  82                }
  83        }
  84
  85        goto success;
  86
  87unrecognized:
  88        /* allow udlfb to load for now even if firmware unrecognized */
  89        DRM_ERROR("Unrecognized vendor firmware descriptor\n");
  90
  91success:
  92        kfree(buf);
  93        return true;
  94}
  95
  96static void udl_release_urb_work(struct work_struct *work)
  97{
  98        struct urb_node *unode = container_of(work, struct urb_node,
  99                                              release_urb_work.work);
 100
 101        up(&unode->dev->urbs.limit_sem);
 102}
 103
 104void udl_urb_completion(struct urb *urb)
 105{
 106        struct urb_node *unode = urb->context;
 107        struct udl_device *udl = unode->dev;
 108        unsigned long flags;
 109
 110        /* sync/async unlink faults aren't errors */
 111        if (urb->status) {
 112                if (!(urb->status == -ENOENT ||
 113                    urb->status == -ECONNRESET ||
 114                    urb->status == -ESHUTDOWN)) {
 115                        DRM_ERROR("%s - nonzero write bulk status received: %d\n",
 116                                __func__, urb->status);
 117                        atomic_set(&udl->lost_pixels, 1);
 118                }
 119        }
 120
 121        urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
 122
 123        spin_lock_irqsave(&udl->urbs.lock, flags);
 124        list_add_tail(&unode->entry, &udl->urbs.list);
 125        udl->urbs.available++;
 126        spin_unlock_irqrestore(&udl->urbs.lock, flags);
 127
 128#if 0
 129        /*
 130         * When using fb_defio, we deadlock if up() is called
 131         * while another is waiting. So queue to another process.
 132         */
 133        if (fb_defio)
 134                schedule_delayed_work(&unode->release_urb_work, 0);
 135        else
 136#endif
 137                up(&udl->urbs.limit_sem);
 138}
 139
 140static void udl_free_urb_list(struct drm_device *dev)
 141{
 142        struct udl_device *udl = dev->dev_private;
 143        int count = udl->urbs.count;
 144        struct list_head *node;
 145        struct urb_node *unode;
 146        struct urb *urb;
 147        int ret;
 148        unsigned long flags;
 149
 150        DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
 151
 152        /* keep waiting and freeing, until we've got 'em all */
 153        while (count--) {
 154
 155                /* Getting interrupted means a leak, but ok at shutdown*/
 156                ret = down_interruptible(&udl->urbs.limit_sem);
 157                if (ret)
 158                        break;
 159
 160                spin_lock_irqsave(&udl->urbs.lock, flags);
 161
 162                node = udl->urbs.list.next; /* have reserved one with sem */
 163                list_del_init(node);
 164
 165                spin_unlock_irqrestore(&udl->urbs.lock, flags);
 166
 167                unode = list_entry(node, struct urb_node, entry);
 168                urb = unode->urb;
 169
 170                /* Free each separately allocated piece */
 171                usb_free_coherent(urb->dev, udl->urbs.size,
 172                                  urb->transfer_buffer, urb->transfer_dma);
 173                usb_free_urb(urb);
 174                kfree(node);
 175        }
 176        udl->urbs.count = 0;
 177}
 178
 179static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
 180{
 181        struct udl_device *udl = dev->dev_private;
 182        int i = 0;
 183        struct urb *urb;
 184        struct urb_node *unode;
 185        char *buf;
 186
 187        spin_lock_init(&udl->urbs.lock);
 188
 189        udl->urbs.size = size;
 190        INIT_LIST_HEAD(&udl->urbs.list);
 191
 192        while (i < count) {
 193                unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
 194                if (!unode)
 195                        break;
 196                unode->dev = udl;
 197
 198                INIT_DELAYED_WORK(&unode->release_urb_work,
 199                          udl_release_urb_work);
 200
 201                urb = usb_alloc_urb(0, GFP_KERNEL);
 202                if (!urb) {
 203                        kfree(unode);
 204                        break;
 205                }
 206                unode->urb = urb;
 207
 208                buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
 209                                         &urb->transfer_dma);
 210                if (!buf) {
 211                        kfree(unode);
 212                        usb_free_urb(urb);
 213                        break;
 214                }
 215
 216                /* urb->transfer_buffer_length set to actual before submit */
 217                usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
 218                        buf, size, udl_urb_completion, unode);
 219                urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 220
 221                list_add_tail(&unode->entry, &udl->urbs.list);
 222
 223                i++;
 224        }
 225
 226        sema_init(&udl->urbs.limit_sem, i);
 227        udl->urbs.count = i;
 228        udl->urbs.available = i;
 229
 230        DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
 231
 232        return i;
 233}
 234
 235struct urb *udl_get_urb(struct drm_device *dev)
 236{
 237        struct udl_device *udl = dev->dev_private;
 238        int ret = 0;
 239        struct list_head *entry;
 240        struct urb_node *unode;
 241        struct urb *urb = NULL;
 242        unsigned long flags;
 243
 244        /* Wait for an in-flight buffer to complete and get re-queued */
 245        ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
 246        if (ret) {
 247                atomic_set(&udl->lost_pixels, 1);
 248                DRM_INFO("wait for urb interrupted: %x available: %d\n",
 249                       ret, udl->urbs.available);
 250                goto error;
 251        }
 252
 253        spin_lock_irqsave(&udl->urbs.lock, flags);
 254
 255        BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
 256        entry = udl->urbs.list.next;
 257        list_del_init(entry);
 258        udl->urbs.available--;
 259
 260        spin_unlock_irqrestore(&udl->urbs.lock, flags);
 261
 262        unode = list_entry(entry, struct urb_node, entry);
 263        urb = unode->urb;
 264
 265error:
 266        return urb;
 267}
 268
 269int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
 270{
 271        struct udl_device *udl = dev->dev_private;
 272        int ret;
 273
 274        BUG_ON(len > udl->urbs.size);
 275
 276        urb->transfer_buffer_length = len; /* set to actual payload len */
 277        ret = usb_submit_urb(urb, GFP_ATOMIC);
 278        if (ret) {
 279                udl_urb_completion(urb); /* because no one else will */
 280                atomic_set(&udl->lost_pixels, 1);
 281                DRM_ERROR("usb_submit_urb error %x\n", ret);
 282        }
 283        return ret;
 284}
 285
 286int udl_driver_load(struct drm_device *dev, unsigned long flags)
 287{
 288        struct udl_device *udl;
 289        int ret;
 290
 291        DRM_DEBUG("\n");
 292        udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
 293        if (!udl)
 294                return -ENOMEM;
 295
 296        udl->ddev = dev;
 297        dev->dev_private = udl;
 298
 299        if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
 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                ret = -ENOMEM;
 306                DRM_ERROR("udl_alloc_urb_list failed\n");
 307                goto err;
 308        }
 309
 310        DRM_DEBUG("\n");
 311        ret = udl_modeset_init(dev);
 312
 313        ret = udl_fbdev_init(dev);
 314        return 0;
 315err:
 316        kfree(udl);
 317        DRM_ERROR("%d\n", ret);
 318        return ret;
 319}
 320
 321int udl_drop_usb(struct drm_device *dev)
 322{
 323        udl_free_urb_list(dev);
 324        return 0;
 325}
 326
 327int udl_driver_unload(struct drm_device *dev)
 328{
 329        struct udl_device *udl = dev->dev_private;
 330
 331        if (udl->urbs.count)
 332                udl_free_urb_list(dev);
 333
 334        udl_fbdev_cleanup(dev);
 335        udl_modeset_cleanup(dev);
 336        kfree(udl);
 337        return 0;
 338}
 339