kernel/drivers/gpu/drm/udl/udl_main.c

   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
  26 static 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
  84 unrecognized:
  85         /* allow udlfb to load for now even if firmware unrecognized */
  86         DRM_ERROR("Unrecognized vendor firmware descriptor\n");
  87
  88 success:
  89         kfree(buf);
  90         return true;
  91 }
  92
  93 static 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
 101 void 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
 137 static 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
 176 static 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
 232 struct 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
 262 error:
 263         return urb;
 264 }
 265
 266 int 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
 283 int 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;
 323 err_fb:
 324         udl_fbdev_cleanup(dev);
 325 err:
 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
 333 int udl_drop_usb(struct drm_device *dev)
 334 {
 335         udl_free_urb_list(dev);
 336         return 0;
 337 }
 338
 339 int 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 }