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 } 339