linux/drivers/gpu/drm/udl/udl_main.c
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   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 <drm/drm_crtc_helper.h>
  15#include "udl_drv.h"
  16
  17/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
  18#define BULK_SIZE 512
  19
  20#define NR_USB_REQUEST_CHANNEL 0x12
  21
  22#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
  23#define WRITES_IN_FLIGHT (4)
  24#define MAX_VENDOR_DESCRIPTOR_SIZE 256
  25
  26#define GET_URB_TIMEOUT HZ
  27#define FREE_URB_TIMEOUT (HZ*2)
  28
  29static int udl_parse_vendor_descriptor(struct drm_device *dev,
  30                                       struct usb_device *usbdev)
  31{
  32        struct udl_device *udl = dev->dev_private;
  33        char *desc;
  34        char *buf;
  35        char *desc_end;
  36
  37        u8 total_len = 0;
  38
  39        buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
  40        if (!buf)
  41                return false;
  42        desc = buf;
  43
  44        total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
  45                                    0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
  46        if (total_len > 5) {
  47                DRM_INFO("vendor descriptor length:%x data:%11ph\n",
  48                        total_len, desc);
  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
  96/*
  97 * Need to ensure a channel is selected before submitting URBs
  98 */
  99static int udl_select_std_channel(struct udl_device *udl)
 100{
 101        int ret;
 102        static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
 103                                         0x1C, 0x88, 0x5E, 0x15,
 104                                         0x60, 0xFE, 0xC6, 0x97,
 105                                         0x16, 0x3D, 0x47, 0xF2};
 106        void *sendbuf;
 107
 108        sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
 109        if (!sendbuf)
 110                return -ENOMEM;
 111
 112        ret = usb_control_msg(udl->udev,
 113                              usb_sndctrlpipe(udl->udev, 0),
 114                              NR_USB_REQUEST_CHANNEL,
 115                              (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
 116                              sendbuf, sizeof(set_def_chn),
 117                              USB_CTRL_SET_TIMEOUT);
 118        kfree(sendbuf);
 119        return ret < 0 ? ret : 0;
 120}
 121
 122static void udl_release_urb_work(struct work_struct *work)
 123{
 124        struct urb_node *unode = container_of(work, struct urb_node,
 125                                              release_urb_work.work);
 126
 127        up(&unode->dev->urbs.limit_sem);
 128}
 129
 130void udl_urb_completion(struct urb *urb)
 131{
 132        struct urb_node *unode = urb->context;
 133        struct udl_device *udl = unode->dev;
 134        unsigned long flags;
 135
 136        /* sync/async unlink faults aren't errors */
 137        if (urb->status) {
 138                if (!(urb->status == -ENOENT ||
 139                    urb->status == -ECONNRESET ||
 140                    urb->status == -ESHUTDOWN)) {
 141                        DRM_ERROR("%s - nonzero write bulk status received: %d\n",
 142                                __func__, urb->status);
 143                        atomic_set(&udl->lost_pixels, 1);
 144                }
 145        }
 146
 147        urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
 148
 149        spin_lock_irqsave(&udl->urbs.lock, flags);
 150        list_add_tail(&unode->entry, &udl->urbs.list);
 151        udl->urbs.available++;
 152        spin_unlock_irqrestore(&udl->urbs.lock, flags);
 153
 154#if 0
 155        /*
 156         * When using fb_defio, we deadlock if up() is called
 157         * while another is waiting. So queue to another process.
 158         */
 159        if (fb_defio)
 160                schedule_delayed_work(&unode->release_urb_work, 0);
 161        else
 162#endif
 163                up(&udl->urbs.limit_sem);
 164}
 165
 166static void udl_free_urb_list(struct drm_device *dev)
 167{
 168        struct udl_device *udl = dev->dev_private;
 169        int count = udl->urbs.count;
 170        struct list_head *node;
 171        struct urb_node *unode;
 172        struct urb *urb;
 173
 174        DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
 175
 176        /* keep waiting and freeing, until we've got 'em all */
 177        while (count--) {
 178                down(&udl->urbs.limit_sem);
 179
 180                spin_lock_irq(&udl->urbs.lock);
 181
 182                node = udl->urbs.list.next; /* have reserved one with sem */
 183                list_del_init(node);
 184
 185                spin_unlock_irq(&udl->urbs.lock);
 186
 187                unode = list_entry(node, struct urb_node, entry);
 188                urb = unode->urb;
 189
 190                /* Free each separately allocated piece */
 191                usb_free_coherent(urb->dev, udl->urbs.size,
 192                                  urb->transfer_buffer, urb->transfer_dma);
 193                usb_free_urb(urb);
 194                kfree(node);
 195        }
 196        udl->urbs.count = 0;
 197}
 198
 199static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
 200{
 201        struct udl_device *udl = dev->dev_private;
 202        struct urb *urb;
 203        struct urb_node *unode;
 204        char *buf;
 205        size_t wanted_size = count * size;
 206
 207        spin_lock_init(&udl->urbs.lock);
 208
 209retry:
 210        udl->urbs.size = size;
 211        INIT_LIST_HEAD(&udl->urbs.list);
 212
 213        sema_init(&udl->urbs.limit_sem, 0);
 214        udl->urbs.count = 0;
 215        udl->urbs.available = 0;
 216
 217        while (udl->urbs.count * size < wanted_size) {
 218                unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
 219                if (!unode)
 220                        break;
 221                unode->dev = udl;
 222
 223                INIT_DELAYED_WORK(&unode->release_urb_work,
 224                          udl_release_urb_work);
 225
 226                urb = usb_alloc_urb(0, GFP_KERNEL);
 227                if (!urb) {
 228                        kfree(unode);
 229                        break;
 230                }
 231                unode->urb = urb;
 232
 233                buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
 234                                         &urb->transfer_dma);
 235                if (!buf) {
 236                        kfree(unode);
 237                        usb_free_urb(urb);
 238                        if (size > PAGE_SIZE) {
 239                                size /= 2;
 240                                udl_free_urb_list(dev);
 241                                goto retry;
 242                        }
 243                        break;
 244                }
 245
 246                /* urb->transfer_buffer_length set to actual before submit */
 247                usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
 248                        buf, size, udl_urb_completion, unode);
 249                urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 250
 251                list_add_tail(&unode->entry, &udl->urbs.list);
 252
 253                up(&udl->urbs.limit_sem);
 254                udl->urbs.count++;
 255                udl->urbs.available++;
 256        }
 257
 258        DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
 259
 260        return udl->urbs.count;
 261}
 262
 263struct urb *udl_get_urb(struct drm_device *dev)
 264{
 265        struct udl_device *udl = dev->dev_private;
 266        int ret = 0;
 267        struct list_head *entry;
 268        struct urb_node *unode;
 269        struct urb *urb = NULL;
 270
 271        /* Wait for an in-flight buffer to complete and get re-queued */
 272        ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
 273        if (ret) {
 274                atomic_set(&udl->lost_pixels, 1);
 275                DRM_INFO("wait for urb interrupted: %x available: %d\n",
 276                       ret, udl->urbs.available);
 277                goto error;
 278        }
 279
 280        spin_lock_irq(&udl->urbs.lock);
 281
 282        BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
 283        entry = udl->urbs.list.next;
 284        list_del_init(entry);
 285        udl->urbs.available--;
 286
 287        spin_unlock_irq(&udl->urbs.lock);
 288
 289        unode = list_entry(entry, struct urb_node, entry);
 290        urb = unode->urb;
 291
 292error:
 293        return urb;
 294}
 295
 296int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
 297{
 298        struct udl_device *udl = dev->dev_private;
 299        int ret;
 300
 301        BUG_ON(len > udl->urbs.size);
 302
 303        urb->transfer_buffer_length = len; /* set to actual payload len */
 304        ret = usb_submit_urb(urb, GFP_ATOMIC);
 305        if (ret) {
 306                udl_urb_completion(urb); /* because no one else will */
 307                atomic_set(&udl->lost_pixels, 1);
 308                DRM_ERROR("usb_submit_urb error %x\n", ret);
 309        }
 310        return ret;
 311}
 312
 313int udl_driver_load(struct drm_device *dev, unsigned long flags)
 314{
 315        struct usb_device *udev = (void*)flags;
 316        struct udl_device *udl;
 317        int ret = -ENOMEM;
 318
 319        DRM_DEBUG("\n");
 320        udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
 321        if (!udl)
 322                return -ENOMEM;
 323
 324        udl->udev = udev;
 325        udl->ddev = dev;
 326        dev->dev_private = udl;
 327
 328        mutex_init(&udl->gem_lock);
 329
 330        if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
 331                ret = -ENODEV;
 332                DRM_ERROR("firmware not recognized. Assume incompatible device\n");
 333                goto err;
 334        }
 335
 336        if (udl_select_std_channel(udl))
 337                DRM_ERROR("Selecting channel failed\n");
 338
 339        if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
 340                DRM_ERROR("udl_alloc_urb_list failed\n");
 341                goto err;
 342        }
 343
 344        DRM_DEBUG("\n");
 345        ret = udl_modeset_init(dev);
 346        if (ret)
 347                goto err;
 348
 349        ret = udl_fbdev_init(dev);
 350        if (ret)
 351                goto err;
 352
 353        drm_kms_helper_poll_init(dev);
 354
 355        return 0;
 356
 357err:
 358        if (udl->urbs.count)
 359                udl_free_urb_list(dev);
 360        kfree(udl);
 361        DRM_ERROR("%d\n", ret);
 362        return ret;
 363}
 364
 365int udl_drop_usb(struct drm_device *dev)
 366{
 367        udl_free_urb_list(dev);
 368        return 0;
 369}
 370
 371void udl_driver_unload(struct drm_device *dev)
 372{
 373        struct udl_device *udl = dev->dev_private;
 374
 375        drm_kms_helper_poll_fini(dev);
 376
 377        if (udl->urbs.count)
 378                udl_free_urb_list(dev);
 379
 380        udl_fbdev_cleanup(dev);
 381        kfree(udl);
 382}
 383
 384void udl_driver_release(struct drm_device *dev)
 385{
 386        udl_modeset_cleanup(dev);
 387        drm_dev_fini(dev);
 388        kfree(dev);
 389}
 390