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 NR_USB_REQUEST_CHANNEL 0x12
  20
  21 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
  22 #define WRITES_IN_FLIGHT (4)
  23 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
  24
  25 #define GET_URB_TIMEOUT HZ
  26 #define FREE_URB_TIMEOUT (HZ*2)
  27
  28 static int udl_parse_vendor_descriptor(struct drm_device *dev,
  29                                        struct usb_device *usbdev)
  30 {
  31         struct udl_device *udl = dev->dev_private;
  32         char *desc;
  33         char *buf;
  34         char *desc_end;
  35
  36         u8 total_len = 0;
  37
  38         buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
  39         if (!buf)
  40                 return false;
  41         desc = buf;
  42
  43         total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
  44                                     0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
  45         if (total_len > 5) {
  46                 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
  47                         total_len, desc);
  48
  49                 if ((desc[0] != total_len) || /* descriptor length */
  50                     (desc[1] != 0x5f) ||   /* vendor descriptor type */
  51                     (desc[2] != 0x01) ||   /* version (2 bytes) */
  52                     (desc[3] != 0x00) ||
  53                     (desc[4] != total_len - 2)) /* length after type */
  54                         goto unrecognized;
  55
  56                 desc_end = desc + total_len;
  57                 desc += 5; /* the fixed header we've already parsed */
  58
  59                 while (desc < desc_end) {
  60                         u8 length;
  61                         u16 key;
  62
  63                         key = le16_to_cpu(*((u16 *) desc));
  64                         desc += sizeof(u16);
  65                         length = *desc;
  66                         desc++;
  67
  68                         switch (key) {
  69                         case 0x0200: { /* max_area */
  70                                 u32 max_area;
  71                                 max_area = le32_to_cpu(*((u32 *)desc));
  72                                 DRM_DEBUG("DL chip limited to %d pixel modes\n",
  73                                         max_area);
  74                                 udl->sku_pixel_limit = max_area;
  75                                 break;
  76                         }
  77                         default:
  78                                 break;
  79                         }
  80                         desc += length;
  81                 }
  82         }
  83
  84         goto success;
  85
  86 unrecognized:
  87         /* allow udlfb to load for now even if firmware unrecognized */
  88         DRM_ERROR("Unrecognized vendor firmware descriptor\n");
  89
  90 success:
  91         kfree(buf);
  92         return true;
  93 }
  94
  95 /*
  96  * Need to ensure a channel is selected before submitting URBs
  97  */
  98 static int udl_select_std_channel(struct udl_device *udl)
  99 {
 100         int ret;
 101         static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,
 102                                          0x1C, 0x88, 0x5E, 0x15,
 103                                          0x60, 0xFE, 0xC6, 0x97,
 104                                          0x16, 0x3D, 0x47, 0xF2};
 105         void *sendbuf;
 106
 107         sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);
 108         if (!sendbuf)
 109                 return -ENOMEM;
 110
 111         ret = usb_control_msg(udl->udev,
 112                               usb_sndctrlpipe(udl->udev, 0),
 113                               NR_USB_REQUEST_CHANNEL,
 114                               (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,
 115                               sendbuf, sizeof(set_def_chn),
 116                               USB_CTRL_SET_TIMEOUT);
 117         kfree(sendbuf);
 118         return ret < 0 ? ret : 0;
 119 }
 120
 121 static void udl_release_urb_work(struct work_struct *work)
 122 {
 123         struct urb_node *unode = container_of(work, struct urb_node,
 124                                               release_urb_work.work);
 125
 126         up(&unode->dev->urbs.limit_sem);
 127 }
 128
 129 void udl_urb_completion(struct urb *urb)
 130 {
 131         struct urb_node *unode = urb->context;
 132         struct udl_device *udl = unode->dev;
 133         unsigned long flags;
 134
 135         /* sync/async unlink faults aren't errors */
 136         if (urb->status) {
 137                 if (!(urb->status == -ENOENT ||
 138                     urb->status == -ECONNRESET ||
 139                     urb->status == -ESHUTDOWN)) {
 140                         DRM_ERROR("%s - nonzero write bulk status received: %d\n",
 141                                 __func__, urb->status);
 142                         atomic_set(&udl->lost_pixels, 1);
 143                 }
 144         }
 145
 146         urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
 147
 148         spin_lock_irqsave(&udl->urbs.lock, flags);
 149         list_add_tail(&unode->entry, &udl->urbs.list);
 150         udl->urbs.available++;
 151         spin_unlock_irqrestore(&udl->urbs.lock, flags);
 152
 153 #if 0
 154         /*
 155          * When using fb_defio, we deadlock if up() is called
 156          * while another is waiting. So queue to another process.
 157          */
 158         if (fb_defio)
 159                 schedule_delayed_work(&unode->release_urb_work, 0);
 160         else
 161 #endif
 162                 up(&udl->urbs.limit_sem);
 163 }
 164
 165 static void udl_free_urb_list(struct drm_device *dev)
 166 {
 167         struct udl_device *udl = dev->dev_private;
 168         int count = udl->urbs.count;
 169         struct list_head *node;
 170         struct urb_node *unode;
 171         struct urb *urb;
 172         int ret;
 173         unsigned long flags;
 174
 175         DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
 176
 177         /* keep waiting and freeing, until we've got 'em all */
 178         while (count--) {
 179
 180                 /* Getting interrupted means a leak, but ok at shutdown*/
 181                 ret = down_interruptible(&udl->urbs.limit_sem);
 182                 if (ret)
 183                         break;
 184
 185                 spin_lock_irqsave(&udl->urbs.lock, flags);
 186
 187                 node = udl->urbs.list.next; /* have reserved one with sem */
 188                 list_del_init(node);
 189
 190                 spin_unlock_irqrestore(&udl->urbs.lock, flags);
 191
 192                 unode = list_entry(node, struct urb_node, entry);
 193                 urb = unode->urb;
 194
 195                 /* Free each separately allocated piece */
 196                 usb_free_coherent(urb->dev, udl->urbs.size,
 197                                   urb->transfer_buffer, urb->transfer_dma);
 198                 usb_free_urb(urb);
 199                 kfree(node);
 200         }
 201         udl->urbs.count = 0;
 202 }
 203
 204 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
 205 {
 206         struct udl_device *udl = dev->dev_private;
 207         int i = 0;
 208         struct urb *urb;
 209         struct urb_node *unode;
 210         char *buf;
 211
 212         spin_lock_init(&udl->urbs.lock);
 213
 214         udl->urbs.size = size;
 215         INIT_LIST_HEAD(&udl->urbs.list);
 216
 217         while (i < count) {
 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, MAX_TRANSFER, GFP_KERNEL,
 234                                          &urb->transfer_dma);
 235                 if (!buf) {
 236                         kfree(unode);
 237                         usb_free_urb(urb);
 238                         break;
 239                 }
 240
 241                 /* urb->transfer_buffer_length set to actual before submit */
 242                 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
 243                         buf, size, udl_urb_completion, unode);
 244                 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 245
 246                 list_add_tail(&unode->entry, &udl->urbs.list);
 247
 248                 i++;
 249         }
 250
 251         sema_init(&udl->urbs.limit_sem, i);
 252         udl->urbs.count = i;
 253         udl->urbs.available = i;
 254
 255         DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
 256
 257         return i;
 258 }
 259
 260 struct urb *udl_get_urb(struct drm_device *dev)
 261 {
 262         struct udl_device *udl = dev->dev_private;
 263         int ret = 0;
 264         struct list_head *entry;
 265         struct urb_node *unode;
 266         struct urb *urb = NULL;
 267         unsigned long flags;
 268
 269         /* Wait for an in-flight buffer to complete and get re-queued */
 270         ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
 271         if (ret) {
 272                 atomic_set(&udl->lost_pixels, 1);
 273                 DRM_INFO("wait for urb interrupted: %x available: %d\n",
 274                        ret, udl->urbs.available);
 275                 goto error;
 276         }
 277
 278         spin_lock_irqsave(&udl->urbs.lock, flags);
 279
 280         BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
 281         entry = udl->urbs.list.next;
 282         list_del_init(entry);
 283         udl->urbs.available--;
 284
 285         spin_unlock_irqrestore(&udl->urbs.lock, flags);
 286
 287         unode = list_entry(entry, struct urb_node, entry);
 288         urb = unode->urb;
 289
 290 error:
 291         return urb;
 292 }
 293
 294 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
 295 {
 296         struct udl_device *udl = dev->dev_private;
 297         int ret;
 298
 299         BUG_ON(len > udl->urbs.size);
 300
 301         urb->transfer_buffer_length = len; /* set to actual payload len */
 302         ret = usb_submit_urb(urb, GFP_ATOMIC);
 303         if (ret) {
 304                 udl_urb_completion(urb); /* because no one else will */
 305                 atomic_set(&udl->lost_pixels, 1);
 306                 DRM_ERROR("usb_submit_urb error %x\n", ret);
 307         }
 308         return ret;
 309 }
 310
 311 int udl_driver_load(struct drm_device *dev, unsigned long flags)
 312 {
 313         struct usb_device *udev = (void*)flags;
 314         struct udl_device *udl;
 315         int ret = -ENOMEM;
 316
 317         DRM_DEBUG("\n");
 318         udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
 319         if (!udl)
 320                 return -ENOMEM;
 321
 322         udl->udev = udev;
 323         udl->ddev = dev;
 324         dev->dev_private = udl;
 325
 326         if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
 327                 ret = -ENODEV;
 328                 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
 329                 goto err;
 330         }
 331
 332         if (udl_select_std_channel(udl))
 333                 DRM_ERROR("Selecting channel failed\n");
 334
 335         if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
 336                 DRM_ERROR("udl_alloc_urb_list failed\n");
 337                 goto err;
 338         }
 339
 340         DRM_DEBUG("\n");
 341         ret = udl_modeset_init(dev);
 342         if (ret)
 343                 goto err;
 344
 345         ret = udl_fbdev_init(dev);
 346         if (ret)
 347                 goto err;
 348
 349         ret = drm_vblank_init(dev, 1);
 350         if (ret)
 351                 goto err_fb;
 352
 353         return 0;
 354 err_fb:
 355         udl_fbdev_cleanup(dev);
 356 err:
 357         if (udl->urbs.count)
 358                 udl_free_urb_list(dev);
 359         kfree(udl);
 360         DRM_ERROR("%d\n", ret);
 361         return ret;
 362 }
 363
 364 int udl_drop_usb(struct drm_device *dev)
 365 {
 366         udl_free_urb_list(dev);
 367         return 0;
 368 }
 369
 370 void udl_driver_unload(struct drm_device *dev)
 371 {
 372         struct udl_device *udl = dev->dev_private;
 373
 374         if (udl->urbs.count)
 375                 udl_free_urb_list(dev);
 376
 377         udl_fbdev_cleanup(dev);
 378         udl_modeset_cleanup(dev);
 379         kfree(udl);
 380 }