1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2012, Microsoft Corporation. 4 * 5 * Author: 6 * Haiyang Zhang <haiyangz@microsoft.com> 7 */ 8 9 /* 10 * Hyper-V Synthetic Video Frame Buffer Driver 11 * 12 * This is the driver for the Hyper-V Synthetic Video, which supports 13 * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows 14 * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2 15 * or earlier. 16 * 17 * It also solves the double mouse cursor issue of the emulated video mode. 18 * 19 * The default screen resolution is 1152x864, which may be changed by a 20 * kernel parameter: 21 * video=hyperv_fb:<width>x<height> 22 * For example: video=hyperv_fb:1280x1024 23 * 24 * Portrait orientation is also supported: 25 * For example: video=hyperv_fb:864x1152 26 * 27 * When a Windows 10 RS5+ host is used, the virtual machine screen 28 * resolution is obtained from the host. The "video=hyperv_fb" option is 29 * not needed, but still can be used to overwrite what the host specifies. 30 * The VM resolution on the host could be set by executing the powershell 31 * "set-vmvideo" command. For example 32 * set-vmvideo -vmname name -horizontalresolution:1920 \ 33 * -verticalresolution:1200 -resolutiontype single 34 * 35 * Gen 1 VMs also support direct using VM's physical memory for framebuffer. 36 * It could improve the efficiency and performance for framebuffer and VM. 37 * This requires to allocate contiguous physical memory from Linux kernel's 38 * CMA memory allocator. To enable this, supply a kernel parameter to give 39 * enough memory space to CMA allocator for framebuffer. For example: 40 * cma=130m 41 * This gives 130MB memory to CMA allocator that can be allocated to 42 * framebuffer. For reference, 8K resolution (7680x4320) takes about 43 * 127MB memory. 44 */ 45 46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 47 48 #include <linux/module.h> 49 #include <linux/kernel.h> 50 #include <linux/init.h> 51 #include <linux/completion.h> 52 #include <linux/fb.h> 53 #include <linux/pci.h> 54 #include <linux/efi.h> 55 #include <linux/console.h> 56 57 #include <linux/hyperv.h> 58 59 60 /* Hyper-V Synthetic Video Protocol definitions and structures */ 61 #define MAX_VMBUS_PKT_SIZE 0x4000 62 63 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) 64 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) 65 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) 66 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5) 67 68 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff) 69 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16) 70 71 #define SYNTHVID_DEPTH_WIN7 16 72 #define SYNTHVID_DEPTH_WIN8 32 73 74 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024) 75 #define SYNTHVID_WIDTH_MAX_WIN7 1600 76 #define SYNTHVID_HEIGHT_MAX_WIN7 1200 77 78 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) 79 80 #define PCI_VENDOR_ID_MICROSOFT 0x1414 81 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 82 83 84 enum pipe_msg_type { 85 PIPE_MSG_INVALID, 86 PIPE_MSG_DATA, 87 PIPE_MSG_MAX 88 }; 89 90 struct pipe_msg_hdr { 91 u32 type; 92 u32 size; /* size of message after this field */ 93 } __packed; 94 95 96 enum synthvid_msg_type { 97 SYNTHVID_ERROR = 0, 98 SYNTHVID_VERSION_REQUEST = 1, 99 SYNTHVID_VERSION_RESPONSE = 2, 100 SYNTHVID_VRAM_LOCATION = 3, 101 SYNTHVID_VRAM_LOCATION_ACK = 4, 102 SYNTHVID_SITUATION_UPDATE = 5, 103 SYNTHVID_SITUATION_UPDATE_ACK = 6, 104 SYNTHVID_POINTER_POSITION = 7, 105 SYNTHVID_POINTER_SHAPE = 8, 106 SYNTHVID_FEATURE_CHANGE = 9, 107 SYNTHVID_DIRT = 10, 108 SYNTHVID_RESOLUTION_REQUEST = 13, 109 SYNTHVID_RESOLUTION_RESPONSE = 14, 110 111 SYNTHVID_MAX = 15 112 }; 113 114 #define SYNTHVID_EDID_BLOCK_SIZE 128 115 #define SYNTHVID_MAX_RESOLUTION_COUNT 64 116 117 struct hvd_screen_info { 118 u16 width; 119 u16 height; 120 } __packed; 121 122 struct synthvid_msg_hdr { 123 u32 type; 124 u32 size; /* size of this header + payload after this field*/ 125 } __packed; 126 127 struct synthvid_version_req { 128 u32 version; 129 } __packed; 130 131 struct synthvid_version_resp { 132 u32 version; 133 u8 is_accepted; 134 u8 max_video_outputs; 135 } __packed; 136 137 struct synthvid_supported_resolution_req { 138 u8 maximum_resolution_count; 139 } __packed; 140 141 struct synthvid_supported_resolution_resp { 142 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE]; 143 u8 resolution_count; 144 u8 default_resolution_index; 145 u8 is_standard; 146 struct hvd_screen_info 147 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT]; 148 } __packed; 149 150 struct synthvid_vram_location { 151 u64 user_ctx; 152 u8 is_vram_gpa_specified; 153 u64 vram_gpa; 154 } __packed; 155 156 struct synthvid_vram_location_ack { 157 u64 user_ctx; 158 } __packed; 159 160 struct video_output_situation { 161 u8 active; 162 u32 vram_offset; 163 u8 depth_bits; 164 u32 width_pixels; 165 u32 height_pixels; 166 u32 pitch_bytes; 167 } __packed; 168 169 struct synthvid_situation_update { 170 u64 user_ctx; 171 u8 video_output_count; 172 struct video_output_situation video_output[1]; 173 } __packed; 174 175 struct synthvid_situation_update_ack { 176 u64 user_ctx; 177 } __packed; 178 179 struct synthvid_pointer_position { 180 u8 is_visible; 181 u8 video_output; 182 s32 image_x; 183 s32 image_y; 184 } __packed; 185 186 187 #define CURSOR_MAX_X 96 188 #define CURSOR_MAX_Y 96 189 #define CURSOR_ARGB_PIXEL_SIZE 4 190 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) 191 #define CURSOR_COMPLETE (-1) 192 193 struct synthvid_pointer_shape { 194 u8 part_idx; 195 u8 is_argb; 196 u32 width; /* CURSOR_MAX_X at most */ 197 u32 height; /* CURSOR_MAX_Y at most */ 198 u32 hot_x; /* hotspot relative to upper-left of pointer image */ 199 u32 hot_y; 200 u8 data[4]; 201 } __packed; 202 203 struct synthvid_feature_change { 204 u8 is_dirt_needed; 205 u8 is_ptr_pos_needed; 206 u8 is_ptr_shape_needed; 207 u8 is_situ_needed; 208 } __packed; 209 210 struct rect { 211 s32 x1, y1; /* top left corner */ 212 s32 x2, y2; /* bottom right corner, exclusive */ 213 } __packed; 214 215 struct synthvid_dirt { 216 u8 video_output; 217 u8 dirt_count; 218 struct rect rect[1]; 219 } __packed; 220 221 struct synthvid_msg { 222 struct pipe_msg_hdr pipe_hdr; 223 struct synthvid_msg_hdr vid_hdr; 224 union { 225 struct synthvid_version_req ver_req; 226 struct synthvid_version_resp ver_resp; 227 struct synthvid_vram_location vram; 228 struct synthvid_vram_location_ack vram_ack; 229 struct synthvid_situation_update situ; 230 struct synthvid_situation_update_ack situ_ack; 231 struct synthvid_pointer_position ptr_pos; 232 struct synthvid_pointer_shape ptr_shape; 233 struct synthvid_feature_change feature_chg; 234 struct synthvid_dirt dirt; 235 struct synthvid_supported_resolution_req resolution_req; 236 struct synthvid_supported_resolution_resp resolution_resp; 237 }; 238 } __packed; 239 240 241 /* FB driver definitions and structures */ 242 #define HVFB_WIDTH 1152 /* default screen width */ 243 #define HVFB_HEIGHT 864 /* default screen height */ 244 #define HVFB_WIDTH_MIN 640 245 #define HVFB_HEIGHT_MIN 480 246 247 #define RING_BUFSIZE (256 * 1024) 248 #define VSP_TIMEOUT (10 * HZ) 249 #define HVFB_UPDATE_DELAY (HZ / 20) 250 #define HVFB_ONDEMAND_THROTTLE (HZ / 20) 251 252 struct hvfb_par { 253 struct fb_info *info; 254 struct resource *mem; 255 bool fb_ready; /* fb device is ready */ 256 struct completion wait; 257 u32 synthvid_version; 258 259 struct delayed_work dwork; 260 bool update; 261 bool update_saved; /* The value of 'update' before hibernation */ 262 263 u32 pseudo_palette[16]; 264 u8 init_buf[MAX_VMBUS_PKT_SIZE]; 265 u8 recv_buf[MAX_VMBUS_PKT_SIZE]; 266 267 /* If true, the VSC notifies the VSP on every framebuffer change */ 268 bool synchronous_fb; 269 270 /* If true, need to copy from deferred IO mem to framebuffer mem */ 271 bool need_docopy; 272 273 struct notifier_block hvfb_panic_nb; 274 275 /* Memory for deferred IO and frame buffer itself */ 276 unsigned char *dio_vp; 277 unsigned char *mmio_vp; 278 phys_addr_t mmio_pp; 279 280 /* Dirty rectangle, protected by delayed_refresh_lock */ 281 int x1, y1, x2, y2; 282 bool delayed_refresh; 283 spinlock_t delayed_refresh_lock; 284 }; 285 286 static uint screen_width = HVFB_WIDTH; 287 static uint screen_height = HVFB_HEIGHT; 288 static uint screen_width_max = HVFB_WIDTH; 289 static uint screen_height_max = HVFB_HEIGHT; 290 static uint screen_depth; 291 static uint screen_fb_size; 292 static uint dio_fb_size; /* FB size for deferred IO */ 293 294 /* Send message to Hyper-V host */ 295 static inline int synthvid_send(struct hv_device *hdev, 296 struct synthvid_msg *msg) 297 { 298 static atomic64_t request_id = ATOMIC64_INIT(0); 299 int ret; 300 301 msg->pipe_hdr.type = PIPE_MSG_DATA; 302 msg->pipe_hdr.size = msg->vid_hdr.size; 303 304 ret = vmbus_sendpacket(hdev->channel, msg, 305 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), 306 atomic64_inc_return(&request_id), 307 VM_PKT_DATA_INBAND, 0); 308 309 if (ret) 310 pr_err("Unable to send packet via vmbus\n"); 311 312 return ret; 313 } 314 315 316 /* Send screen resolution info to host */ 317 static int synthvid_send_situ(struct hv_device *hdev) 318 { 319 struct fb_info *info = hv_get_drvdata(hdev); 320 struct synthvid_msg msg; 321 322 if (!info) 323 return -ENODEV; 324 325 memset(&msg, 0, sizeof(struct synthvid_msg)); 326 327 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; 328 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 329 sizeof(struct synthvid_situation_update); 330 msg.situ.user_ctx = 0; 331 msg.situ.video_output_count = 1; 332 msg.situ.video_output[0].active = 1; 333 msg.situ.video_output[0].vram_offset = 0; 334 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; 335 msg.situ.video_output[0].width_pixels = info->var.xres; 336 msg.situ.video_output[0].height_pixels = info->var.yres; 337 msg.situ.video_output[0].pitch_bytes = info->fix.line_length; 338 339 synthvid_send(hdev, &msg); 340 341 return 0; 342 } 343 344 /* Send mouse pointer info to host */ 345 static int synthvid_send_ptr(struct hv_device *hdev) 346 { 347 struct synthvid_msg msg; 348 349 memset(&msg, 0, sizeof(struct synthvid_msg)); 350 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; 351 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 352 sizeof(struct synthvid_pointer_position); 353 msg.ptr_pos.is_visible = 1; 354 msg.ptr_pos.video_output = 0; 355 msg.ptr_pos.image_x = 0; 356 msg.ptr_pos.image_y = 0; 357 synthvid_send(hdev, &msg); 358 359 memset(&msg, 0, sizeof(struct synthvid_msg)); 360 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; 361 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 362 sizeof(struct synthvid_pointer_shape); 363 msg.ptr_shape.part_idx = CURSOR_COMPLETE; 364 msg.ptr_shape.is_argb = 1; 365 msg.ptr_shape.width = 1; 366 msg.ptr_shape.height = 1; 367 msg.ptr_shape.hot_x = 0; 368 msg.ptr_shape.hot_y = 0; 369 msg.ptr_shape.data[0] = 0; 370 msg.ptr_shape.data[1] = 1; 371 msg.ptr_shape.data[2] = 1; 372 msg.ptr_shape.data[3] = 1; 373 synthvid_send(hdev, &msg); 374 375 return 0; 376 } 377 378 /* Send updated screen area (dirty rectangle) location to host */ 379 static int 380 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2) 381 { 382 struct hv_device *hdev = device_to_hv_device(info->device); 383 struct synthvid_msg msg; 384 385 memset(&msg, 0, sizeof(struct synthvid_msg)); 386 if (x2 == INT_MAX) 387 x2 = info->var.xres; 388 if (y2 == INT_MAX) 389 y2 = info->var.yres; 390 391 msg.vid_hdr.type = SYNTHVID_DIRT; 392 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 393 sizeof(struct synthvid_dirt); 394 msg.dirt.video_output = 0; 395 msg.dirt.dirt_count = 1; 396 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1; 397 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1; 398 msg.dirt.rect[0].x2 = 399 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2; 400 msg.dirt.rect[0].y2 = 401 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2; 402 403 synthvid_send(hdev, &msg); 404 405 return 0; 406 } 407 408 static void hvfb_docopy(struct hvfb_par *par, 409 unsigned long offset, 410 unsigned long size) 411 { 412 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready || 413 size == 0 || offset >= dio_fb_size) 414 return; 415 416 if (offset + size > dio_fb_size) 417 size = dio_fb_size - offset; 418 419 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size); 420 } 421 422 /* Deferred IO callback */ 423 static void synthvid_deferred_io(struct fb_info *p, 424 struct list_head *pagelist) 425 { 426 struct hvfb_par *par = p->par; 427 struct page *page; 428 unsigned long start, end; 429 int y1, y2, miny, maxy; 430 431 miny = INT_MAX; 432 maxy = 0; 433 434 /* 435 * Merge dirty pages. It is possible that last page cross 436 * over the end of frame buffer row yres. This is taken care of 437 * in synthvid_update function by clamping the y2 438 * value to yres. 439 */ 440 list_for_each_entry(page, pagelist, lru) { 441 start = page->index << PAGE_SHIFT; 442 end = start + PAGE_SIZE - 1; 443 y1 = start / p->fix.line_length; 444 y2 = end / p->fix.line_length; 445 miny = min_t(int, miny, y1); 446 maxy = max_t(int, maxy, y2); 447 448 /* Copy from dio space to mmio address */ 449 if (par->fb_ready && par->need_docopy) 450 hvfb_docopy(par, start, PAGE_SIZE); 451 } 452 453 if (par->fb_ready && par->update) 454 synthvid_update(p, 0, miny, p->var.xres, maxy + 1); 455 } 456 457 static struct fb_deferred_io synthvid_defio = { 458 .delay = HZ / 20, 459 .deferred_io = synthvid_deferred_io, 460 }; 461 462 /* 463 * Actions on received messages from host: 464 * Complete the wait event. 465 * Or, reply with screen and cursor info. 466 */ 467 static void synthvid_recv_sub(struct hv_device *hdev) 468 { 469 struct fb_info *info = hv_get_drvdata(hdev); 470 struct hvfb_par *par; 471 struct synthvid_msg *msg; 472 473 if (!info) 474 return; 475 476 par = info->par; 477 msg = (struct synthvid_msg *)par->recv_buf; 478 479 /* Complete the wait event */ 480 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || 481 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE || 482 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { 483 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); 484 complete(&par->wait); 485 return; 486 } 487 488 /* Reply with screen and cursor info */ 489 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { 490 if (par->fb_ready) { 491 synthvid_send_ptr(hdev); 492 synthvid_send_situ(hdev); 493 } 494 495 par->update = msg->feature_chg.is_dirt_needed; 496 if (par->update) 497 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 498 } 499 } 500 501 /* Receive callback for messages from the host */ 502 static void synthvid_receive(void *ctx) 503 { 504 struct hv_device *hdev = ctx; 505 struct fb_info *info = hv_get_drvdata(hdev); 506 struct hvfb_par *par; 507 struct synthvid_msg *recv_buf; 508 u32 bytes_recvd; 509 u64 req_id; 510 int ret; 511 512 if (!info) 513 return; 514 515 par = info->par; 516 recv_buf = (struct synthvid_msg *)par->recv_buf; 517 518 do { 519 ret = vmbus_recvpacket(hdev->channel, recv_buf, 520 MAX_VMBUS_PKT_SIZE, 521 &bytes_recvd, &req_id); 522 if (bytes_recvd > 0 && 523 recv_buf->pipe_hdr.type == PIPE_MSG_DATA) 524 synthvid_recv_sub(hdev); 525 } while (bytes_recvd > 0 && ret == 0); 526 } 527 528 /* Check if the ver1 version is equal or greater than ver2 */ 529 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2) 530 { 531 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) || 532 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) && 533 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2))) 534 return true; 535 536 return false; 537 } 538 539 /* Check synthetic video protocol version with the host */ 540 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) 541 { 542 struct fb_info *info = hv_get_drvdata(hdev); 543 struct hvfb_par *par = info->par; 544 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 545 int ret = 0; 546 unsigned long t; 547 548 memset(msg, 0, sizeof(struct synthvid_msg)); 549 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 550 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 551 sizeof(struct synthvid_version_req); 552 msg->ver_req.version = ver; 553 synthvid_send(hdev, msg); 554 555 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 556 if (!t) { 557 pr_err("Time out on waiting version response\n"); 558 ret = -ETIMEDOUT; 559 goto out; 560 } 561 if (!msg->ver_resp.is_accepted) { 562 ret = -ENODEV; 563 goto out; 564 } 565 566 par->synthvid_version = ver; 567 pr_info("Synthvid Version major %d, minor %d\n", 568 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); 569 570 out: 571 return ret; 572 } 573 574 /* Get current resolution from the host */ 575 static int synthvid_get_supported_resolution(struct hv_device *hdev) 576 { 577 struct fb_info *info = hv_get_drvdata(hdev); 578 struct hvfb_par *par = info->par; 579 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 580 int ret = 0; 581 unsigned long t; 582 u8 index; 583 int i; 584 585 memset(msg, 0, sizeof(struct synthvid_msg)); 586 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 587 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 588 sizeof(struct synthvid_supported_resolution_req); 589 590 msg->resolution_req.maximum_resolution_count = 591 SYNTHVID_MAX_RESOLUTION_COUNT; 592 synthvid_send(hdev, msg); 593 594 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 595 if (!t) { 596 pr_err("Time out on waiting resolution response\n"); 597 ret = -ETIMEDOUT; 598 goto out; 599 } 600 601 if (msg->resolution_resp.resolution_count == 0) { 602 pr_err("No supported resolutions\n"); 603 ret = -ENODEV; 604 goto out; 605 } 606 607 index = msg->resolution_resp.default_resolution_index; 608 if (index >= msg->resolution_resp.resolution_count) { 609 pr_err("Invalid resolution index: %d\n", index); 610 ret = -ENODEV; 611 goto out; 612 } 613 614 for (i = 0; i < msg->resolution_resp.resolution_count; i++) { 615 screen_width_max = max_t(unsigned int, screen_width_max, 616 msg->resolution_resp.supported_resolution[i].width); 617 screen_height_max = max_t(unsigned int, screen_height_max, 618 msg->resolution_resp.supported_resolution[i].height); 619 } 620 621 screen_width = 622 msg->resolution_resp.supported_resolution[index].width; 623 screen_height = 624 msg->resolution_resp.supported_resolution[index].height; 625 626 out: 627 return ret; 628 } 629 630 /* Connect to VSP (Virtual Service Provider) on host */ 631 static int synthvid_connect_vsp(struct hv_device *hdev) 632 { 633 struct fb_info *info = hv_get_drvdata(hdev); 634 struct hvfb_par *par = info->par; 635 int ret; 636 637 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 638 NULL, 0, synthvid_receive, hdev); 639 if (ret) { 640 pr_err("Unable to open vmbus channel\n"); 641 return ret; 642 } 643 644 /* Negotiate the protocol version with host */ 645 switch (vmbus_proto_version) { 646 case VERSION_WIN10: 647 case VERSION_WIN10_V5: 648 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 649 if (!ret) 650 break; 651 /* Fallthrough */ 652 case VERSION_WIN8: 653 case VERSION_WIN8_1: 654 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 655 if (!ret) 656 break; 657 /* Fallthrough */ 658 case VERSION_WS2008: 659 case VERSION_WIN7: 660 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); 661 break; 662 default: 663 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 664 break; 665 } 666 667 if (ret) { 668 pr_err("Synthetic video device version not accepted\n"); 669 goto error; 670 } 671 672 if (par->synthvid_version == SYNTHVID_VERSION_WIN7) 673 screen_depth = SYNTHVID_DEPTH_WIN7; 674 else 675 screen_depth = SYNTHVID_DEPTH_WIN8; 676 677 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 678 ret = synthvid_get_supported_resolution(hdev); 679 if (ret) 680 pr_info("Failed to get supported resolution from host, use default\n"); 681 } 682 683 screen_fb_size = hdev->channel->offermsg.offer. 684 mmio_megabytes * 1024 * 1024; 685 686 return 0; 687 688 error: 689 vmbus_close(hdev->channel); 690 return ret; 691 } 692 693 /* Send VRAM and Situation messages to the host */ 694 static int synthvid_send_config(struct hv_device *hdev) 695 { 696 struct fb_info *info = hv_get_drvdata(hdev); 697 struct hvfb_par *par = info->par; 698 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 699 int ret = 0; 700 unsigned long t; 701 702 /* Send VRAM location */ 703 memset(msg, 0, sizeof(struct synthvid_msg)); 704 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 705 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 706 sizeof(struct synthvid_vram_location); 707 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 708 msg->vram.is_vram_gpa_specified = 1; 709 synthvid_send(hdev, msg); 710 711 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 712 if (!t) { 713 pr_err("Time out on waiting vram location ack\n"); 714 ret = -ETIMEDOUT; 715 goto out; 716 } 717 if (msg->vram_ack.user_ctx != par->mmio_pp) { 718 pr_err("Unable to set VRAM location\n"); 719 ret = -ENODEV; 720 goto out; 721 } 722 723 /* Send pointer and situation update */ 724 synthvid_send_ptr(hdev); 725 synthvid_send_situ(hdev); 726 727 out: 728 return ret; 729 } 730 731 732 /* 733 * Delayed work callback: 734 * It is scheduled to call whenever update request is received and it has 735 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 736 */ 737 static void hvfb_update_work(struct work_struct *w) 738 { 739 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 740 struct fb_info *info = par->info; 741 unsigned long flags; 742 int x1, x2, y1, y2; 743 int j; 744 745 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 746 /* Reset the request flag */ 747 par->delayed_refresh = false; 748 749 /* Store the dirty rectangle to local variables */ 750 x1 = par->x1; 751 x2 = par->x2; 752 y1 = par->y1; 753 y2 = par->y2; 754 755 /* Clear dirty rectangle */ 756 par->x1 = par->y1 = INT_MAX; 757 par->x2 = par->y2 = 0; 758 759 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 760 761 if (x1 > info->var.xres || x2 > info->var.xres || 762 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 763 return; 764 765 /* Copy the dirty rectangle to frame buffer memory */ 766 if (par->need_docopy) 767 for (j = y1; j < y2; j++) 768 hvfb_docopy(par, 769 j * info->fix.line_length + 770 (x1 * screen_depth / 8), 771 (x2 - x1) * screen_depth / 8); 772 773 /* Refresh */ 774 if (par->fb_ready && par->update) 775 synthvid_update(info, x1, y1, x2, y2); 776 } 777 778 /* 779 * Control the on-demand refresh frequency. It schedules a delayed 780 * screen update if it has not yet. 781 */ 782 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 783 int x1, int y1, int w, int h) 784 { 785 unsigned long flags; 786 int x2 = x1 + w; 787 int y2 = y1 + h; 788 789 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 790 791 /* Merge dirty rectangle */ 792 par->x1 = min_t(int, par->x1, x1); 793 par->y1 = min_t(int, par->y1, y1); 794 par->x2 = max_t(int, par->x2, x2); 795 par->y2 = max_t(int, par->y2, y2); 796 797 /* Schedule a delayed screen update if not yet */ 798 if (par->delayed_refresh == false) { 799 schedule_delayed_work(&par->dwork, 800 HVFB_ONDEMAND_THROTTLE); 801 par->delayed_refresh = true; 802 } 803 804 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 805 } 806 807 static int hvfb_on_panic(struct notifier_block *nb, 808 unsigned long e, void *p) 809 { 810 struct hvfb_par *par; 811 struct fb_info *info; 812 813 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 814 par->synchronous_fb = true; 815 info = par->info; 816 if (par->need_docopy) 817 hvfb_docopy(par, 0, dio_fb_size); 818 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 819 820 return NOTIFY_DONE; 821 } 822 823 /* Framebuffer operation handlers */ 824 825 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 826 { 827 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 828 var->xres > screen_width || var->yres > screen_height || 829 var->bits_per_pixel != screen_depth) 830 return -EINVAL; 831 832 var->xres_virtual = var->xres; 833 var->yres_virtual = var->yres; 834 835 return 0; 836 } 837 838 static int hvfb_set_par(struct fb_info *info) 839 { 840 struct hv_device *hdev = device_to_hv_device(info->device); 841 842 return synthvid_send_situ(hdev); 843 } 844 845 846 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 847 { 848 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 849 } 850 851 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 852 unsigned blue, unsigned transp, struct fb_info *info) 853 { 854 u32 *pal = info->pseudo_palette; 855 856 if (regno > 15) 857 return -EINVAL; 858 859 pal[regno] = chan_to_field(red, &info->var.red) 860 | chan_to_field(green, &info->var.green) 861 | chan_to_field(blue, &info->var.blue) 862 | chan_to_field(transp, &info->var.transp); 863 864 return 0; 865 } 866 867 static int hvfb_blank(int blank, struct fb_info *info) 868 { 869 return 1; /* get fb_blank to set the colormap to all black */ 870 } 871 872 static void hvfb_cfb_fillrect(struct fb_info *p, 873 const struct fb_fillrect *rect) 874 { 875 struct hvfb_par *par = p->par; 876 877 cfb_fillrect(p, rect); 878 if (par->synchronous_fb) 879 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 880 else 881 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy, 882 rect->width, rect->height); 883 } 884 885 static void hvfb_cfb_copyarea(struct fb_info *p, 886 const struct fb_copyarea *area) 887 { 888 struct hvfb_par *par = p->par; 889 890 cfb_copyarea(p, area); 891 if (par->synchronous_fb) 892 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 893 else 894 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy, 895 area->width, area->height); 896 } 897 898 static void hvfb_cfb_imageblit(struct fb_info *p, 899 const struct fb_image *image) 900 { 901 struct hvfb_par *par = p->par; 902 903 cfb_imageblit(p, image); 904 if (par->synchronous_fb) 905 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 906 else 907 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy, 908 image->width, image->height); 909 } 910 911 static const struct fb_ops hvfb_ops = { 912 .owner = THIS_MODULE, 913 .fb_check_var = hvfb_check_var, 914 .fb_set_par = hvfb_set_par, 915 .fb_setcolreg = hvfb_setcolreg, 916 .fb_fillrect = hvfb_cfb_fillrect, 917 .fb_copyarea = hvfb_cfb_copyarea, 918 .fb_imageblit = hvfb_cfb_imageblit, 919 .fb_blank = hvfb_blank, 920 }; 921 922 923 /* Get options from kernel paramenter "video=" */ 924 static void hvfb_get_option(struct fb_info *info) 925 { 926 struct hvfb_par *par = info->par; 927 char *opt = NULL, *p; 928 uint x = 0, y = 0; 929 930 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 931 return; 932 933 p = strsep(&opt, "x"); 934 if (!*p || kstrtouint(p, 0, &x) || 935 !opt || !*opt || kstrtouint(opt, 0, &y)) { 936 pr_err("Screen option is invalid: skipped\n"); 937 return; 938 } 939 940 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 941 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) && 942 (x > screen_width_max || y > screen_height_max)) || 943 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 944 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || 945 (par->synthvid_version == SYNTHVID_VERSION_WIN7 && 946 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { 947 pr_err("Screen resolution option is out of range: skipped\n"); 948 return; 949 } 950 951 screen_width = x; 952 screen_height = y; 953 return; 954 } 955 956 /* 957 * Allocate enough contiguous physical memory. 958 * Return physical address if succeeded or -1 if failed. 959 */ 960 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev, 961 unsigned int request_size) 962 { 963 struct page *page = NULL; 964 dma_addr_t dma_handle; 965 void *vmem; 966 phys_addr_t paddr = 0; 967 unsigned int order = get_order(request_size); 968 969 if (request_size == 0) 970 return -1; 971 972 if (order < MAX_ORDER) { 973 /* Call alloc_pages if the size is less than 2^MAX_ORDER */ 974 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 975 if (!page) 976 return -1; 977 978 paddr = (page_to_pfn(page) << PAGE_SHIFT); 979 } else { 980 /* Allocate from CMA */ 981 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64); 982 983 vmem = dma_alloc_coherent(&hdev->device, 984 round_up(request_size, PAGE_SIZE), 985 &dma_handle, 986 GFP_KERNEL | __GFP_NOWARN); 987 988 if (!vmem) 989 return -1; 990 991 paddr = virt_to_phys(vmem); 992 } 993 994 return paddr; 995 } 996 997 /* Release contiguous physical memory */ 998 static void hvfb_release_phymem(struct hv_device *hdev, 999 phys_addr_t paddr, unsigned int size) 1000 { 1001 unsigned int order = get_order(size); 1002 1003 if (order < MAX_ORDER) 1004 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 1005 else 1006 dma_free_coherent(&hdev->device, 1007 round_up(size, PAGE_SIZE), 1008 phys_to_virt(paddr), 1009 paddr); 1010 } 1011 1012 1013 /* Get framebuffer memory from Hyper-V video pci space */ 1014 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 1015 { 1016 struct hvfb_par *par = info->par; 1017 struct pci_dev *pdev = NULL; 1018 void __iomem *fb_virt; 1019 int gen2vm = efi_enabled(EFI_BOOT); 1020 resource_size_t pot_start, pot_end; 1021 phys_addr_t paddr; 1022 int ret; 1023 1024 info->apertures = alloc_apertures(1); 1025 if (!info->apertures) 1026 return -ENOMEM; 1027 1028 if (!gen2vm) { 1029 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 1030 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 1031 if (!pdev) { 1032 pr_err("Unable to find PCI Hyper-V video\n"); 1033 kfree(info->apertures); 1034 return -ENODEV; 1035 } 1036 1037 info->apertures->ranges[0].base = pci_resource_start(pdev, 0); 1038 info->apertures->ranges[0].size = pci_resource_len(pdev, 0); 1039 1040 /* 1041 * For Gen 1 VM, we can directly use the contiguous memory 1042 * from VM. If we succeed, deferred IO happens directly 1043 * on this allocated framebuffer memory, avoiding extra 1044 * memory copy. 1045 */ 1046 paddr = hvfb_get_phymem(hdev, screen_fb_size); 1047 if (paddr != (phys_addr_t) -1) { 1048 par->mmio_pp = paddr; 1049 par->mmio_vp = par->dio_vp = __va(paddr); 1050 1051 info->fix.smem_start = paddr; 1052 info->fix.smem_len = screen_fb_size; 1053 info->screen_base = par->mmio_vp; 1054 info->screen_size = screen_fb_size; 1055 1056 par->need_docopy = false; 1057 goto getmem_done; 1058 } 1059 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n"); 1060 } else { 1061 info->apertures->ranges[0].base = screen_info.lfb_base; 1062 info->apertures->ranges[0].size = screen_info.lfb_size; 1063 } 1064 1065 /* 1066 * Cannot use the contiguous physical memory. 1067 * Allocate mmio space for framebuffer. 1068 */ 1069 dio_fb_size = 1070 screen_width * screen_height * screen_depth / 8; 1071 1072 if (gen2vm) { 1073 pot_start = 0; 1074 pot_end = -1; 1075 } else { 1076 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) || 1077 pci_resource_len(pdev, 0) < screen_fb_size) { 1078 pr_err("Resource not available or (0x%lx < 0x%lx)\n", 1079 (unsigned long) pci_resource_len(pdev, 0), 1080 (unsigned long) screen_fb_size); 1081 goto err1; 1082 } 1083 1084 pot_end = pci_resource_end(pdev, 0); 1085 pot_start = pot_end - screen_fb_size + 1; 1086 } 1087 1088 ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end, 1089 screen_fb_size, 0x100000, true); 1090 if (ret != 0) { 1091 pr_err("Unable to allocate framebuffer memory\n"); 1092 goto err1; 1093 } 1094 1095 fb_virt = ioremap(par->mem->start, screen_fb_size); 1096 if (!fb_virt) 1097 goto err2; 1098 1099 /* Allocate memory for deferred IO */ 1100 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1101 if (par->dio_vp == NULL) 1102 goto err3; 1103 1104 /* Physical address of FB device */ 1105 par->mmio_pp = par->mem->start; 1106 /* Virtual address of FB device */ 1107 par->mmio_vp = (unsigned char *) fb_virt; 1108 1109 info->fix.smem_start = par->mem->start; 1110 info->fix.smem_len = dio_fb_size; 1111 info->screen_base = par->dio_vp; 1112 info->screen_size = dio_fb_size; 1113 1114 getmem_done: 1115 remove_conflicting_framebuffers(info->apertures, 1116 KBUILD_MODNAME, false); 1117 if (!gen2vm) 1118 pci_dev_put(pdev); 1119 kfree(info->apertures); 1120 1121 return 0; 1122 1123 err3: 1124 iounmap(fb_virt); 1125 err2: 1126 vmbus_free_mmio(par->mem->start, screen_fb_size); 1127 par->mem = NULL; 1128 err1: 1129 if (!gen2vm) 1130 pci_dev_put(pdev); 1131 kfree(info->apertures); 1132 1133 return -ENOMEM; 1134 } 1135 1136 /* Release the framebuffer */ 1137 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info) 1138 { 1139 struct hvfb_par *par = info->par; 1140 1141 if (par->need_docopy) { 1142 vfree(par->dio_vp); 1143 iounmap(info->screen_base); 1144 vmbus_free_mmio(par->mem->start, screen_fb_size); 1145 } else { 1146 hvfb_release_phymem(hdev, info->fix.smem_start, 1147 screen_fb_size); 1148 } 1149 1150 par->mem = NULL; 1151 } 1152 1153 1154 static int hvfb_probe(struct hv_device *hdev, 1155 const struct hv_vmbus_device_id *dev_id) 1156 { 1157 struct fb_info *info; 1158 struct hvfb_par *par; 1159 int ret; 1160 1161 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1162 if (!info) 1163 return -ENOMEM; 1164 1165 par = info->par; 1166 par->info = info; 1167 par->fb_ready = false; 1168 par->need_docopy = true; 1169 init_completion(&par->wait); 1170 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1171 1172 par->delayed_refresh = false; 1173 spin_lock_init(&par->delayed_refresh_lock); 1174 par->x1 = par->y1 = INT_MAX; 1175 par->x2 = par->y2 = 0; 1176 1177 /* Connect to VSP */ 1178 hv_set_drvdata(hdev, info); 1179 ret = synthvid_connect_vsp(hdev); 1180 if (ret) { 1181 pr_err("Unable to connect to VSP\n"); 1182 goto error1; 1183 } 1184 1185 hvfb_get_option(info); 1186 pr_info("Screen resolution: %dx%d, Color depth: %d\n", 1187 screen_width, screen_height, screen_depth); 1188 1189 ret = hvfb_getmem(hdev, info); 1190 if (ret) { 1191 pr_err("No memory for framebuffer\n"); 1192 goto error2; 1193 } 1194 1195 /* Set up fb_info */ 1196 info->flags = FBINFO_DEFAULT; 1197 1198 info->var.xres_virtual = info->var.xres = screen_width; 1199 info->var.yres_virtual = info->var.yres = screen_height; 1200 info->var.bits_per_pixel = screen_depth; 1201 1202 if (info->var.bits_per_pixel == 16) { 1203 info->var.red = (struct fb_bitfield){11, 5, 0}; 1204 info->var.green = (struct fb_bitfield){5, 6, 0}; 1205 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1206 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1207 } else { 1208 info->var.red = (struct fb_bitfield){16, 8, 0}; 1209 info->var.green = (struct fb_bitfield){8, 8, 0}; 1210 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1211 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1212 } 1213 1214 info->var.activate = FB_ACTIVATE_NOW; 1215 info->var.height = -1; 1216 info->var.width = -1; 1217 info->var.vmode = FB_VMODE_NONINTERLACED; 1218 1219 strcpy(info->fix.id, KBUILD_MODNAME); 1220 info->fix.type = FB_TYPE_PACKED_PIXELS; 1221 info->fix.visual = FB_VISUAL_TRUECOLOR; 1222 info->fix.line_length = screen_width * screen_depth / 8; 1223 info->fix.accel = FB_ACCEL_NONE; 1224 1225 info->fbops = &hvfb_ops; 1226 info->pseudo_palette = par->pseudo_palette; 1227 1228 /* Initialize deferred IO */ 1229 info->fbdefio = &synthvid_defio; 1230 fb_deferred_io_init(info); 1231 1232 /* Send config to host */ 1233 ret = synthvid_send_config(hdev); 1234 if (ret) 1235 goto error; 1236 1237 ret = register_framebuffer(info); 1238 if (ret) { 1239 pr_err("Unable to register framebuffer\n"); 1240 goto error; 1241 } 1242 1243 par->fb_ready = true; 1244 1245 par->synchronous_fb = false; 1246 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1247 atomic_notifier_chain_register(&panic_notifier_list, 1248 &par->hvfb_panic_nb); 1249 1250 return 0; 1251 1252 error: 1253 fb_deferred_io_cleanup(info); 1254 hvfb_putmem(hdev, info); 1255 error2: 1256 vmbus_close(hdev->channel); 1257 error1: 1258 cancel_delayed_work_sync(&par->dwork); 1259 hv_set_drvdata(hdev, NULL); 1260 framebuffer_release(info); 1261 return ret; 1262 } 1263 1264 1265 static int hvfb_remove(struct hv_device *hdev) 1266 { 1267 struct fb_info *info = hv_get_drvdata(hdev); 1268 struct hvfb_par *par = info->par; 1269 1270 atomic_notifier_chain_unregister(&panic_notifier_list, 1271 &par->hvfb_panic_nb); 1272 1273 par->update = false; 1274 par->fb_ready = false; 1275 1276 fb_deferred_io_cleanup(info); 1277 1278 unregister_framebuffer(info); 1279 cancel_delayed_work_sync(&par->dwork); 1280 1281 vmbus_close(hdev->channel); 1282 hv_set_drvdata(hdev, NULL); 1283 1284 hvfb_putmem(hdev, info); 1285 framebuffer_release(info); 1286 1287 return 0; 1288 } 1289 1290 static int hvfb_suspend(struct hv_device *hdev) 1291 { 1292 struct fb_info *info = hv_get_drvdata(hdev); 1293 struct hvfb_par *par = info->par; 1294 1295 console_lock(); 1296 1297 /* 1 means do suspend */ 1298 fb_set_suspend(info, 1); 1299 1300 cancel_delayed_work_sync(&par->dwork); 1301 cancel_delayed_work_sync(&info->deferred_work); 1302 1303 par->update_saved = par->update; 1304 par->update = false; 1305 par->fb_ready = false; 1306 1307 vmbus_close(hdev->channel); 1308 1309 console_unlock(); 1310 1311 return 0; 1312 } 1313 1314 static int hvfb_resume(struct hv_device *hdev) 1315 { 1316 struct fb_info *info = hv_get_drvdata(hdev); 1317 struct hvfb_par *par = info->par; 1318 int ret; 1319 1320 console_lock(); 1321 1322 ret = synthvid_connect_vsp(hdev); 1323 if (ret != 0) 1324 goto out; 1325 1326 ret = synthvid_send_config(hdev); 1327 if (ret != 0) { 1328 vmbus_close(hdev->channel); 1329 goto out; 1330 } 1331 1332 par->fb_ready = true; 1333 par->update = par->update_saved; 1334 1335 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1336 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1337 1338 /* 0 means do resume */ 1339 fb_set_suspend(info, 0); 1340 1341 out: 1342 console_unlock(); 1343 1344 return ret; 1345 } 1346 1347 1348 static const struct pci_device_id pci_stub_id_table[] = { 1349 { 1350 .vendor = PCI_VENDOR_ID_MICROSOFT, 1351 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1352 }, 1353 { /* end of list */ } 1354 }; 1355 1356 static const struct hv_vmbus_device_id id_table[] = { 1357 /* Synthetic Video Device GUID */ 1358 {HV_SYNTHVID_GUID}, 1359 {} 1360 }; 1361 1362 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1363 MODULE_DEVICE_TABLE(vmbus, id_table); 1364 1365 static struct hv_driver hvfb_drv = { 1366 .name = KBUILD_MODNAME, 1367 .id_table = id_table, 1368 .probe = hvfb_probe, 1369 .remove = hvfb_remove, 1370 .suspend = hvfb_suspend, 1371 .resume = hvfb_resume, 1372 .driver = { 1373 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1374 }, 1375 }; 1376 1377 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1378 const struct pci_device_id *ent) 1379 { 1380 return 0; 1381 } 1382 1383 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1384 { 1385 } 1386 1387 static struct pci_driver hvfb_pci_stub_driver = { 1388 .name = KBUILD_MODNAME, 1389 .id_table = pci_stub_id_table, 1390 .probe = hvfb_pci_stub_probe, 1391 .remove = hvfb_pci_stub_remove, 1392 .driver = { 1393 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1394 } 1395 }; 1396 1397 static int __init hvfb_drv_init(void) 1398 { 1399 int ret; 1400 1401 ret = vmbus_driver_register(&hvfb_drv); 1402 if (ret != 0) 1403 return ret; 1404 1405 ret = pci_register_driver(&hvfb_pci_stub_driver); 1406 if (ret != 0) { 1407 vmbus_driver_unregister(&hvfb_drv); 1408 return ret; 1409 } 1410 1411 return 0; 1412 } 1413 1414 static void __exit hvfb_drv_exit(void) 1415 { 1416 pci_unregister_driver(&hvfb_pci_stub_driver); 1417 vmbus_driver_unregister(&hvfb_drv); 1418 } 1419 1420 module_init(hvfb_drv_init); 1421 module_exit(hvfb_drv_exit); 1422 1423 MODULE_LICENSE("GPL"); 1424 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1425