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 "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:%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
  87 unrecognized:
  88         /* allow udlfb to load for now even if firmware unrecognized */
  89         DRM_ERROR("Unrecognized vendor firmware descriptor\n");
  90
  91 success:
  92         kfree(buf);
  93         return true;
  94 }
  95
  96 static 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
 104 void 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
 140 static 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
 179 static 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
 235 struct 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
 265 error:
 266         return urb;
 267 }
 268
 269 int 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
 286 int 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;
 315 err:
 316         kfree(udl);
 317         DRM_ERROR("%d\n", ret);
 318         return ret;
 319 }
 320
 321 int udl_drop_usb(struct drm_device *dev)
 322 {
 323         udl_free_urb_list(dev);
 324         return 0;
 325 }
 326
 327 int 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 }