1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Red Hat 4 * 5 * based in parts on udlfb.c: 6 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> 7 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> 8 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> 9 */ 10 11 #include <drm/drm.h> 12 #include <drm/drm_print.h> 13 #include <drm/drm_probe_helper.h> 14 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 29 static int udl_parse_vendor_descriptor(struct udl_device *udl) 30 { 31 struct usb_device *udev = udl_to_usb_device(udl); 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(udev, 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 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7, 101 0x1C, 0x88, 0x5E, 0x15, 102 0x60, 0xFE, 0xC6, 0x97, 103 0x16, 0x3D, 0x47, 0xF2}; 104 105 void *sendbuf; 106 int ret; 107 struct usb_device *udev = udl_to_usb_device(udl); 108 109 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL); 110 if (!sendbuf) 111 return -ENOMEM; 112 113 ret = usb_control_msg(udev, usb_sndctrlpipe(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 } 121 122 static 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 } 129 130 void 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 } 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 = to_udl(dev); 168 int count = udl->urbs.count; 169 struct list_head *node; 170 struct urb_node *unode; 171 struct urb *urb; 172 173 DRM_DEBUG("Waiting for completes and freeing all render urbs\n"); 174 175 /* keep waiting and freeing, until we've got 'em all */ 176 while (count--) { 177 down(&udl->urbs.limit_sem); 178 179 spin_lock_irq(&udl->urbs.lock); 180 181 node = udl->urbs.list.next; /* have reserved one with sem */ 182 list_del_init(node); 183 184 spin_unlock_irq(&udl->urbs.lock); 185 186 unode = list_entry(node, struct urb_node, entry); 187 urb = unode->urb; 188 189 /* Free each separately allocated piece */ 190 usb_free_coherent(urb->dev, udl->urbs.size, 191 urb->transfer_buffer, urb->transfer_dma); 192 usb_free_urb(urb); 193 kfree(node); 194 } 195 udl->urbs.count = 0; 196 } 197 198 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size) 199 { 200 struct udl_device *udl = to_udl(dev); 201 struct urb *urb; 202 struct urb_node *unode; 203 char *buf; 204 size_t wanted_size = count * size; 205 struct usb_device *udev = udl_to_usb_device(udl); 206 207 spin_lock_init(&udl->urbs.lock); 208 209 retry: 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(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, udev, usb_sndbulkpipe(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 } 262 263 struct urb *udl_get_urb(struct drm_device *dev) 264 { 265 struct udl_device *udl = to_udl(dev); 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 DRM_INFO("wait for urb interrupted: %x available: %d\n", 275 ret, udl->urbs.available); 276 goto error; 277 } 278 279 spin_lock_irq(&udl->urbs.lock); 280 281 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */ 282 entry = udl->urbs.list.next; 283 list_del_init(entry); 284 udl->urbs.available--; 285 286 spin_unlock_irq(&udl->urbs.lock); 287 288 unode = list_entry(entry, struct urb_node, entry); 289 urb = unode->urb; 290 291 error: 292 return urb; 293 } 294 295 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len) 296 { 297 struct udl_device *udl = to_udl(dev); 298 int ret; 299 300 BUG_ON(len > udl->urbs.size); 301 302 urb->transfer_buffer_length = len; /* set to actual payload len */ 303 ret = usb_submit_urb(urb, GFP_ATOMIC); 304 if (ret) { 305 udl_urb_completion(urb); /* because no one else will */ 306 DRM_ERROR("usb_submit_urb error %x\n", ret); 307 } 308 return ret; 309 } 310 311 int udl_init(struct udl_device *udl) 312 { 313 struct drm_device *dev = &udl->drm; 314 int ret = -ENOMEM; 315 316 DRM_DEBUG("\n"); 317 318 mutex_init(&udl->gem_lock); 319 320 if (!udl_parse_vendor_descriptor(udl)) { 321 ret = -ENODEV; 322 DRM_ERROR("firmware not recognized. Assume incompatible device\n"); 323 goto err; 324 } 325 326 if (udl_select_std_channel(udl)) 327 DRM_ERROR("Selecting channel failed\n"); 328 329 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { 330 DRM_ERROR("udl_alloc_urb_list failed\n"); 331 goto err; 332 } 333 334 DRM_DEBUG("\n"); 335 ret = udl_modeset_init(dev); 336 if (ret) 337 goto err; 338 339 drm_kms_helper_poll_init(dev); 340 341 return 0; 342 343 err: 344 if (udl->urbs.count) 345 udl_free_urb_list(dev); 346 DRM_ERROR("%d\n", ret); 347 return ret; 348 } 349 350 int udl_drop_usb(struct drm_device *dev) 351 { 352 udl_free_urb_list(dev); 353 return 0; 354 } 355