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 drm_device *dev, 30 struct usb_device *usbdev) 31 { 32 struct udl_device *udl = to_udl(dev); 33 char *desc; 34 char *buf; 35 char *desc_end; 36 37 u8 total_len = 0; 38 39 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); 40 if (!buf) 41 return false; 42 desc = buf; 43 44 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */ 45 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); 46 if (total_len > 5) { 47 DRM_INFO("vendor descriptor length:%x data:%11ph\n", 48 total_len, desc); 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 /* 97 * Need to ensure a channel is selected before submitting URBs 98 */ 99 static int udl_select_std_channel(struct udl_device *udl) 100 { 101 int ret; 102 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7, 103 0x1C, 0x88, 0x5E, 0x15, 104 0x60, 0xFE, 0xC6, 0x97, 105 0x16, 0x3D, 0x47, 0xF2}; 106 void *sendbuf; 107 108 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL); 109 if (!sendbuf) 110 return -ENOMEM; 111 112 ret = usb_control_msg(udl->udev, 113 usb_sndctrlpipe(udl->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; 205 206 spin_lock_init(&udl->urbs.lock); 207 208 retry: 209 udl->urbs.size = size; 210 INIT_LIST_HEAD(&udl->urbs.list); 211 212 sema_init(&udl->urbs.limit_sem, 0); 213 udl->urbs.count = 0; 214 udl->urbs.available = 0; 215 216 while (udl->urbs.count * size < wanted_size) { 217 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); 218 if (!unode) 219 break; 220 unode->dev = udl; 221 222 INIT_DELAYED_WORK(&unode->release_urb_work, 223 udl_release_urb_work); 224 225 urb = usb_alloc_urb(0, GFP_KERNEL); 226 if (!urb) { 227 kfree(unode); 228 break; 229 } 230 unode->urb = urb; 231 232 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL, 233 &urb->transfer_dma); 234 if (!buf) { 235 kfree(unode); 236 usb_free_urb(urb); 237 if (size > PAGE_SIZE) { 238 size /= 2; 239 udl_free_urb_list(dev); 240 goto retry; 241 } 242 break; 243 } 244 245 /* urb->transfer_buffer_length set to actual before submit */ 246 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1), 247 buf, size, udl_urb_completion, unode); 248 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 249 250 list_add_tail(&unode->entry, &udl->urbs.list); 251 252 up(&udl->urbs.limit_sem); 253 udl->urbs.count++; 254 udl->urbs.available++; 255 } 256 257 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size); 258 259 return udl->urbs.count; 260 } 261 262 struct urb *udl_get_urb(struct drm_device *dev) 263 { 264 struct udl_device *udl = to_udl(dev); 265 int ret = 0; 266 struct list_head *entry; 267 struct urb_node *unode; 268 struct urb *urb = NULL; 269 270 /* Wait for an in-flight buffer to complete and get re-queued */ 271 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT); 272 if (ret) { 273 DRM_INFO("wait for urb interrupted: %x available: %d\n", 274 ret, udl->urbs.available); 275 goto error; 276 } 277 278 spin_lock_irq(&udl->urbs.lock); 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_irq(&udl->urbs.lock); 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 = to_udl(dev); 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 DRM_ERROR("usb_submit_urb error %x\n", ret); 306 } 307 return ret; 308 } 309 310 int udl_init(struct udl_device *udl) 311 { 312 struct drm_device *dev = &udl->drm; 313 int ret = -ENOMEM; 314 315 DRM_DEBUG("\n"); 316 317 mutex_init(&udl->gem_lock); 318 319 if (!udl_parse_vendor_descriptor(dev, udl->udev)) { 320 ret = -ENODEV; 321 DRM_ERROR("firmware not recognized. Assume incompatible device\n"); 322 goto err; 323 } 324 325 if (udl_select_std_channel(udl)) 326 DRM_ERROR("Selecting channel failed\n"); 327 328 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { 329 DRM_ERROR("udl_alloc_urb_list failed\n"); 330 goto err; 331 } 332 333 DRM_DEBUG("\n"); 334 ret = udl_modeset_init(dev); 335 if (ret) 336 goto err; 337 338 drm_kms_helper_poll_init(dev); 339 340 return 0; 341 342 err: 343 if (udl->urbs.count) 344 udl_free_urb_list(dev); 345 DRM_ERROR("%d\n", ret); 346 return ret; 347 } 348 349 int udl_drop_usb(struct drm_device *dev) 350 { 351 udl_free_urb_list(dev); 352 return 0; 353 } 354