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/vmalloc.h> 51 #include <linux/init.h> 52 #include <linux/completion.h> 53 #include <linux/fb.h> 54 #include <linux/pci.h> 55 #include <linux/efi.h> 56 #include <linux/console.h> 57 58 #include <linux/hyperv.h> 59 60 61 /* Hyper-V Synthetic Video Protocol definitions and structures */ 62 #define MAX_VMBUS_PKT_SIZE 0x4000 63 64 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) 65 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) 66 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) 67 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5) 68 69 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff) 70 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16) 71 72 #define SYNTHVID_DEPTH_WIN7 16 73 #define SYNTHVID_DEPTH_WIN8 32 74 75 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024) 76 #define SYNTHVID_WIDTH_MAX_WIN7 1600 77 #define SYNTHVID_HEIGHT_MAX_WIN7 1200 78 79 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) 80 81 #define PCI_VENDOR_ID_MICROSOFT 0x1414 82 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 83 84 85 enum pipe_msg_type { 86 PIPE_MSG_INVALID, 87 PIPE_MSG_DATA, 88 PIPE_MSG_MAX 89 }; 90 91 struct pipe_msg_hdr { 92 u32 type; 93 u32 size; /* size of message after this field */ 94 } __packed; 95 96 97 enum synthvid_msg_type { 98 SYNTHVID_ERROR = 0, 99 SYNTHVID_VERSION_REQUEST = 1, 100 SYNTHVID_VERSION_RESPONSE = 2, 101 SYNTHVID_VRAM_LOCATION = 3, 102 SYNTHVID_VRAM_LOCATION_ACK = 4, 103 SYNTHVID_SITUATION_UPDATE = 5, 104 SYNTHVID_SITUATION_UPDATE_ACK = 6, 105 SYNTHVID_POINTER_POSITION = 7, 106 SYNTHVID_POINTER_SHAPE = 8, 107 SYNTHVID_FEATURE_CHANGE = 9, 108 SYNTHVID_DIRT = 10, 109 SYNTHVID_RESOLUTION_REQUEST = 13, 110 SYNTHVID_RESOLUTION_RESPONSE = 14, 111 112 SYNTHVID_MAX = 15 113 }; 114 115 #define SYNTHVID_EDID_BLOCK_SIZE 128 116 #define SYNTHVID_MAX_RESOLUTION_COUNT 64 117 118 struct hvd_screen_info { 119 u16 width; 120 u16 height; 121 } __packed; 122 123 struct synthvid_msg_hdr { 124 u32 type; 125 u32 size; /* size of this header + payload after this field*/ 126 } __packed; 127 128 struct synthvid_version_req { 129 u32 version; 130 } __packed; 131 132 struct synthvid_version_resp { 133 u32 version; 134 u8 is_accepted; 135 u8 max_video_outputs; 136 } __packed; 137 138 struct synthvid_supported_resolution_req { 139 u8 maximum_resolution_count; 140 } __packed; 141 142 struct synthvid_supported_resolution_resp { 143 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE]; 144 u8 resolution_count; 145 u8 default_resolution_index; 146 u8 is_standard; 147 struct hvd_screen_info 148 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT]; 149 } __packed; 150 151 struct synthvid_vram_location { 152 u64 user_ctx; 153 u8 is_vram_gpa_specified; 154 u64 vram_gpa; 155 } __packed; 156 157 struct synthvid_vram_location_ack { 158 u64 user_ctx; 159 } __packed; 160 161 struct video_output_situation { 162 u8 active; 163 u32 vram_offset; 164 u8 depth_bits; 165 u32 width_pixels; 166 u32 height_pixels; 167 u32 pitch_bytes; 168 } __packed; 169 170 struct synthvid_situation_update { 171 u64 user_ctx; 172 u8 video_output_count; 173 struct video_output_situation video_output[1]; 174 } __packed; 175 176 struct synthvid_situation_update_ack { 177 u64 user_ctx; 178 } __packed; 179 180 struct synthvid_pointer_position { 181 u8 is_visible; 182 u8 video_output; 183 s32 image_x; 184 s32 image_y; 185 } __packed; 186 187 188 #define CURSOR_MAX_X 96 189 #define CURSOR_MAX_Y 96 190 #define CURSOR_ARGB_PIXEL_SIZE 4 191 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) 192 #define CURSOR_COMPLETE (-1) 193 194 struct synthvid_pointer_shape { 195 u8 part_idx; 196 u8 is_argb; 197 u32 width; /* CURSOR_MAX_X at most */ 198 u32 height; /* CURSOR_MAX_Y at most */ 199 u32 hot_x; /* hotspot relative to upper-left of pointer image */ 200 u32 hot_y; 201 u8 data[4]; 202 } __packed; 203 204 struct synthvid_feature_change { 205 u8 is_dirt_needed; 206 u8 is_ptr_pos_needed; 207 u8 is_ptr_shape_needed; 208 u8 is_situ_needed; 209 } __packed; 210 211 struct rect { 212 s32 x1, y1; /* top left corner */ 213 s32 x2, y2; /* bottom right corner, exclusive */ 214 } __packed; 215 216 struct synthvid_dirt { 217 u8 video_output; 218 u8 dirt_count; 219 struct rect rect[1]; 220 } __packed; 221 222 struct synthvid_msg { 223 struct pipe_msg_hdr pipe_hdr; 224 struct synthvid_msg_hdr vid_hdr; 225 union { 226 struct synthvid_version_req ver_req; 227 struct synthvid_version_resp ver_resp; 228 struct synthvid_vram_location vram; 229 struct synthvid_vram_location_ack vram_ack; 230 struct synthvid_situation_update situ; 231 struct synthvid_situation_update_ack situ_ack; 232 struct synthvid_pointer_position ptr_pos; 233 struct synthvid_pointer_shape ptr_shape; 234 struct synthvid_feature_change feature_chg; 235 struct synthvid_dirt dirt; 236 struct synthvid_supported_resolution_req resolution_req; 237 struct synthvid_supported_resolution_resp resolution_resp; 238 }; 239 } __packed; 240 241 242 /* FB driver definitions and structures */ 243 #define HVFB_WIDTH 1152 /* default screen width */ 244 #define HVFB_HEIGHT 864 /* default screen height */ 245 #define HVFB_WIDTH_MIN 640 246 #define HVFB_HEIGHT_MIN 480 247 248 #define RING_BUFSIZE (256 * 1024) 249 #define VSP_TIMEOUT (10 * HZ) 250 #define HVFB_UPDATE_DELAY (HZ / 20) 251 #define HVFB_ONDEMAND_THROTTLE (HZ / 20) 252 253 struct hvfb_par { 254 struct fb_info *info; 255 struct resource *mem; 256 bool fb_ready; /* fb device is ready */ 257 struct completion wait; 258 u32 synthvid_version; 259 260 struct delayed_work dwork; 261 bool update; 262 bool update_saved; /* The value of 'update' before hibernation */ 263 264 u32 pseudo_palette[16]; 265 u8 init_buf[MAX_VMBUS_PKT_SIZE]; 266 u8 recv_buf[MAX_VMBUS_PKT_SIZE]; 267 268 /* If true, the VSC notifies the VSP on every framebuffer change */ 269 bool synchronous_fb; 270 271 /* If true, need to copy from deferred IO mem to framebuffer mem */ 272 bool need_docopy; 273 274 struct notifier_block hvfb_panic_nb; 275 276 /* Memory for deferred IO and frame buffer itself */ 277 unsigned char *dio_vp; 278 unsigned char *mmio_vp; 279 phys_addr_t mmio_pp; 280 281 /* Dirty rectangle, protected by delayed_refresh_lock */ 282 int x1, y1, x2, y2; 283 bool delayed_refresh; 284 spinlock_t delayed_refresh_lock; 285 }; 286 287 static uint screen_width = HVFB_WIDTH; 288 static uint screen_height = HVFB_HEIGHT; 289 static uint screen_width_max = HVFB_WIDTH; 290 static uint screen_height_max = HVFB_HEIGHT; 291 static uint screen_depth; 292 static uint screen_fb_size; 293 static uint dio_fb_size; /* FB size for deferred IO */ 294 295 /* Send message to Hyper-V host */ 296 static inline int synthvid_send(struct hv_device *hdev, 297 struct synthvid_msg *msg) 298 { 299 static atomic64_t request_id = ATOMIC64_INIT(0); 300 int ret; 301 302 msg->pipe_hdr.type = PIPE_MSG_DATA; 303 msg->pipe_hdr.size = msg->vid_hdr.size; 304 305 ret = vmbus_sendpacket(hdev->channel, msg, 306 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), 307 atomic64_inc_return(&request_id), 308 VM_PKT_DATA_INBAND, 0); 309 310 if (ret) 311 pr_err("Unable to send packet via vmbus\n"); 312 313 return ret; 314 } 315 316 317 /* Send screen resolution info to host */ 318 static int synthvid_send_situ(struct hv_device *hdev) 319 { 320 struct fb_info *info = hv_get_drvdata(hdev); 321 struct synthvid_msg msg; 322 323 if (!info) 324 return -ENODEV; 325 326 memset(&msg, 0, sizeof(struct synthvid_msg)); 327 328 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; 329 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 330 sizeof(struct synthvid_situation_update); 331 msg.situ.user_ctx = 0; 332 msg.situ.video_output_count = 1; 333 msg.situ.video_output[0].active = 1; 334 msg.situ.video_output[0].vram_offset = 0; 335 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; 336 msg.situ.video_output[0].width_pixels = info->var.xres; 337 msg.situ.video_output[0].height_pixels = info->var.yres; 338 msg.situ.video_output[0].pitch_bytes = info->fix.line_length; 339 340 synthvid_send(hdev, &msg); 341 342 return 0; 343 } 344 345 /* Send mouse pointer info to host */ 346 static int synthvid_send_ptr(struct hv_device *hdev) 347 { 348 struct synthvid_msg msg; 349 350 memset(&msg, 0, sizeof(struct synthvid_msg)); 351 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; 352 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 353 sizeof(struct synthvid_pointer_position); 354 msg.ptr_pos.is_visible = 1; 355 msg.ptr_pos.video_output = 0; 356 msg.ptr_pos.image_x = 0; 357 msg.ptr_pos.image_y = 0; 358 synthvid_send(hdev, &msg); 359 360 memset(&msg, 0, sizeof(struct synthvid_msg)); 361 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; 362 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 363 sizeof(struct synthvid_pointer_shape); 364 msg.ptr_shape.part_idx = CURSOR_COMPLETE; 365 msg.ptr_shape.is_argb = 1; 366 msg.ptr_shape.width = 1; 367 msg.ptr_shape.height = 1; 368 msg.ptr_shape.hot_x = 0; 369 msg.ptr_shape.hot_y = 0; 370 msg.ptr_shape.data[0] = 0; 371 msg.ptr_shape.data[1] = 1; 372 msg.ptr_shape.data[2] = 1; 373 msg.ptr_shape.data[3] = 1; 374 synthvid_send(hdev, &msg); 375 376 return 0; 377 } 378 379 /* Send updated screen area (dirty rectangle) location to host */ 380 static int 381 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2) 382 { 383 struct hv_device *hdev = device_to_hv_device(info->device); 384 struct synthvid_msg msg; 385 386 memset(&msg, 0, sizeof(struct synthvid_msg)); 387 if (x2 == INT_MAX) 388 x2 = info->var.xres; 389 if (y2 == INT_MAX) 390 y2 = info->var.yres; 391 392 msg.vid_hdr.type = SYNTHVID_DIRT; 393 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 394 sizeof(struct synthvid_dirt); 395 msg.dirt.video_output = 0; 396 msg.dirt.dirt_count = 1; 397 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1; 398 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1; 399 msg.dirt.rect[0].x2 = 400 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2; 401 msg.dirt.rect[0].y2 = 402 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2; 403 404 synthvid_send(hdev, &msg); 405 406 return 0; 407 } 408 409 static void hvfb_docopy(struct hvfb_par *par, 410 unsigned long offset, 411 unsigned long size) 412 { 413 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready || 414 size == 0 || offset >= dio_fb_size) 415 return; 416 417 if (offset + size > dio_fb_size) 418 size = dio_fb_size - offset; 419 420 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size); 421 } 422 423 /* Deferred IO callback */ 424 static void synthvid_deferred_io(struct fb_info *p, 425 struct list_head *pagelist) 426 { 427 struct hvfb_par *par = p->par; 428 struct page *page; 429 unsigned long start, end; 430 int y1, y2, miny, maxy; 431 432 miny = INT_MAX; 433 maxy = 0; 434 435 /* 436 * Merge dirty pages. It is possible that last page cross 437 * over the end of frame buffer row yres. This is taken care of 438 * in synthvid_update function by clamping the y2 439 * value to yres. 440 */ 441 list_for_each_entry(page, pagelist, lru) { 442 start = page->index << PAGE_SHIFT; 443 end = start + PAGE_SIZE - 1; 444 y1 = start / p->fix.line_length; 445 y2 = end / p->fix.line_length; 446 miny = min_t(int, miny, y1); 447 maxy = max_t(int, maxy, y2); 448 449 /* Copy from dio space to mmio address */ 450 if (par->fb_ready && par->need_docopy) 451 hvfb_docopy(par, start, PAGE_SIZE); 452 } 453 454 if (par->fb_ready && par->update) 455 synthvid_update(p, 0, miny, p->var.xres, maxy + 1); 456 } 457 458 static struct fb_deferred_io synthvid_defio = { 459 .delay = HZ / 20, 460 .deferred_io = synthvid_deferred_io, 461 }; 462 463 /* 464 * Actions on received messages from host: 465 * Complete the wait event. 466 * Or, reply with screen and cursor info. 467 */ 468 static void synthvid_recv_sub(struct hv_device *hdev) 469 { 470 struct fb_info *info = hv_get_drvdata(hdev); 471 struct hvfb_par *par; 472 struct synthvid_msg *msg; 473 474 if (!info) 475 return; 476 477 par = info->par; 478 msg = (struct synthvid_msg *)par->recv_buf; 479 480 /* Complete the wait event */ 481 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || 482 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE || 483 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { 484 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); 485 complete(&par->wait); 486 return; 487 } 488 489 /* Reply with screen and cursor info */ 490 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { 491 if (par->fb_ready) { 492 synthvid_send_ptr(hdev); 493 synthvid_send_situ(hdev); 494 } 495 496 par->update = msg->feature_chg.is_dirt_needed; 497 if (par->update) 498 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 499 } 500 } 501 502 /* Receive callback for messages from the host */ 503 static void synthvid_receive(void *ctx) 504 { 505 struct hv_device *hdev = ctx; 506 struct fb_info *info = hv_get_drvdata(hdev); 507 struct hvfb_par *par; 508 struct synthvid_msg *recv_buf; 509 u32 bytes_recvd; 510 u64 req_id; 511 int ret; 512 513 if (!info) 514 return; 515 516 par = info->par; 517 recv_buf = (struct synthvid_msg *)par->recv_buf; 518 519 do { 520 ret = vmbus_recvpacket(hdev->channel, recv_buf, 521 MAX_VMBUS_PKT_SIZE, 522 &bytes_recvd, &req_id); 523 if (bytes_recvd > 0 && 524 recv_buf->pipe_hdr.type == PIPE_MSG_DATA) 525 synthvid_recv_sub(hdev); 526 } while (bytes_recvd > 0 && ret == 0); 527 } 528 529 /* Check if the ver1 version is equal or greater than ver2 */ 530 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2) 531 { 532 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) || 533 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) && 534 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2))) 535 return true; 536 537 return false; 538 } 539 540 /* Check synthetic video protocol version with the host */ 541 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) 542 { 543 struct fb_info *info = hv_get_drvdata(hdev); 544 struct hvfb_par *par = info->par; 545 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 546 int ret = 0; 547 unsigned long t; 548 549 memset(msg, 0, sizeof(struct synthvid_msg)); 550 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 551 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 552 sizeof(struct synthvid_version_req); 553 msg->ver_req.version = ver; 554 synthvid_send(hdev, msg); 555 556 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 557 if (!t) { 558 pr_err("Time out on waiting version response\n"); 559 ret = -ETIMEDOUT; 560 goto out; 561 } 562 if (!msg->ver_resp.is_accepted) { 563 ret = -ENODEV; 564 goto out; 565 } 566 567 par->synthvid_version = ver; 568 pr_info("Synthvid Version major %d, minor %d\n", 569 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); 570 571 out: 572 return ret; 573 } 574 575 /* Get current resolution from the host */ 576 static int synthvid_get_supported_resolution(struct hv_device *hdev) 577 { 578 struct fb_info *info = hv_get_drvdata(hdev); 579 struct hvfb_par *par = info->par; 580 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 581 int ret = 0; 582 unsigned long t; 583 u8 index; 584 int i; 585 586 memset(msg, 0, sizeof(struct synthvid_msg)); 587 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 588 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 589 sizeof(struct synthvid_supported_resolution_req); 590 591 msg->resolution_req.maximum_resolution_count = 592 SYNTHVID_MAX_RESOLUTION_COUNT; 593 synthvid_send(hdev, msg); 594 595 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 596 if (!t) { 597 pr_err("Time out on waiting resolution response\n"); 598 ret = -ETIMEDOUT; 599 goto out; 600 } 601 602 if (msg->resolution_resp.resolution_count == 0) { 603 pr_err("No supported resolutions\n"); 604 ret = -ENODEV; 605 goto out; 606 } 607 608 index = msg->resolution_resp.default_resolution_index; 609 if (index >= msg->resolution_resp.resolution_count) { 610 pr_err("Invalid resolution index: %d\n", index); 611 ret = -ENODEV; 612 goto out; 613 } 614 615 for (i = 0; i < msg->resolution_resp.resolution_count; i++) { 616 screen_width_max = max_t(unsigned int, screen_width_max, 617 msg->resolution_resp.supported_resolution[i].width); 618 screen_height_max = max_t(unsigned int, screen_height_max, 619 msg->resolution_resp.supported_resolution[i].height); 620 } 621 622 screen_width = 623 msg->resolution_resp.supported_resolution[index].width; 624 screen_height = 625 msg->resolution_resp.supported_resolution[index].height; 626 627 out: 628 return ret; 629 } 630 631 /* Connect to VSP (Virtual Service Provider) on host */ 632 static int synthvid_connect_vsp(struct hv_device *hdev) 633 { 634 struct fb_info *info = hv_get_drvdata(hdev); 635 struct hvfb_par *par = info->par; 636 int ret; 637 638 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 639 NULL, 0, synthvid_receive, hdev); 640 if (ret) { 641 pr_err("Unable to open vmbus channel\n"); 642 return ret; 643 } 644 645 /* Negotiate the protocol version with host */ 646 switch (vmbus_proto_version) { 647 case VERSION_WIN10: 648 case VERSION_WIN10_V5: 649 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 650 if (!ret) 651 break; 652 fallthrough; 653 case VERSION_WIN8: 654 case VERSION_WIN8_1: 655 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 656 if (!ret) 657 break; 658 fallthrough; 659 case VERSION_WS2008: 660 case VERSION_WIN7: 661 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); 662 break; 663 default: 664 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 665 break; 666 } 667 668 if (ret) { 669 pr_err("Synthetic video device version not accepted\n"); 670 goto error; 671 } 672 673 if (par->synthvid_version == SYNTHVID_VERSION_WIN7) 674 screen_depth = SYNTHVID_DEPTH_WIN7; 675 else 676 screen_depth = SYNTHVID_DEPTH_WIN8; 677 678 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 679 ret = synthvid_get_supported_resolution(hdev); 680 if (ret) 681 pr_info("Failed to get supported resolution from host, use default\n"); 682 } 683 684 screen_fb_size = hdev->channel->offermsg.offer. 685 mmio_megabytes * 1024 * 1024; 686 687 return 0; 688 689 error: 690 vmbus_close(hdev->channel); 691 return ret; 692 } 693 694 /* Send VRAM and Situation messages to the host */ 695 static int synthvid_send_config(struct hv_device *hdev) 696 { 697 struct fb_info *info = hv_get_drvdata(hdev); 698 struct hvfb_par *par = info->par; 699 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 700 int ret = 0; 701 unsigned long t; 702 703 /* Send VRAM location */ 704 memset(msg, 0, sizeof(struct synthvid_msg)); 705 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 706 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 707 sizeof(struct synthvid_vram_location); 708 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 709 msg->vram.is_vram_gpa_specified = 1; 710 synthvid_send(hdev, msg); 711 712 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 713 if (!t) { 714 pr_err("Time out on waiting vram location ack\n"); 715 ret = -ETIMEDOUT; 716 goto out; 717 } 718 if (msg->vram_ack.user_ctx != par->mmio_pp) { 719 pr_err("Unable to set VRAM location\n"); 720 ret = -ENODEV; 721 goto out; 722 } 723 724 /* Send pointer and situation update */ 725 synthvid_send_ptr(hdev); 726 synthvid_send_situ(hdev); 727 728 out: 729 return ret; 730 } 731 732 733 /* 734 * Delayed work callback: 735 * It is scheduled to call whenever update request is received and it has 736 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 737 */ 738 static void hvfb_update_work(struct work_struct *w) 739 { 740 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 741 struct fb_info *info = par->info; 742 unsigned long flags; 743 int x1, x2, y1, y2; 744 int j; 745 746 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 747 /* Reset the request flag */ 748 par->delayed_refresh = false; 749 750 /* Store the dirty rectangle to local variables */ 751 x1 = par->x1; 752 x2 = par->x2; 753 y1 = par->y1; 754 y2 = par->y2; 755 756 /* Clear dirty rectangle */ 757 par->x1 = par->y1 = INT_MAX; 758 par->x2 = par->y2 = 0; 759 760 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 761 762 if (x1 > info->var.xres || x2 > info->var.xres || 763 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 764 return; 765 766 /* Copy the dirty rectangle to frame buffer memory */ 767 if (par->need_docopy) 768 for (j = y1; j < y2; j++) 769 hvfb_docopy(par, 770 j * info->fix.line_length + 771 (x1 * screen_depth / 8), 772 (x2 - x1) * screen_depth / 8); 773 774 /* Refresh */ 775 if (par->fb_ready && par->update) 776 synthvid_update(info, x1, y1, x2, y2); 777 } 778 779 /* 780 * Control the on-demand refresh frequency. It schedules a delayed 781 * screen update if it has not yet. 782 */ 783 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 784 int x1, int y1, int w, int h) 785 { 786 unsigned long flags; 787 int x2 = x1 + w; 788 int y2 = y1 + h; 789 790 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 791 792 /* Merge dirty rectangle */ 793 par->x1 = min_t(int, par->x1, x1); 794 par->y1 = min_t(int, par->y1, y1); 795 par->x2 = max_t(int, par->x2, x2); 796 par->y2 = max_t(int, par->y2, y2); 797 798 /* Schedule a delayed screen update if not yet */ 799 if (par->delayed_refresh == false) { 800 schedule_delayed_work(&par->dwork, 801 HVFB_ONDEMAND_THROTTLE); 802 par->delayed_refresh = true; 803 } 804 805 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 806 } 807 808 static int hvfb_on_panic(struct notifier_block *nb, 809 unsigned long e, void *p) 810 { 811 struct hvfb_par *par; 812 struct fb_info *info; 813 814 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 815 par->synchronous_fb = true; 816 info = par->info; 817 if (par->need_docopy) 818 hvfb_docopy(par, 0, dio_fb_size); 819 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 820 821 return NOTIFY_DONE; 822 } 823 824 /* Framebuffer operation handlers */ 825 826 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 827 { 828 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 829 var->xres > screen_width || var->yres > screen_height || 830 var->bits_per_pixel != screen_depth) 831 return -EINVAL; 832 833 var->xres_virtual = var->xres; 834 var->yres_virtual = var->yres; 835 836 return 0; 837 } 838 839 static int hvfb_set_par(struct fb_info *info) 840 { 841 struct hv_device *hdev = device_to_hv_device(info->device); 842 843 return synthvid_send_situ(hdev); 844 } 845 846 847 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 848 { 849 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 850 } 851 852 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 853 unsigned blue, unsigned transp, struct fb_info *info) 854 { 855 u32 *pal = info->pseudo_palette; 856 857 if (regno > 15) 858 return -EINVAL; 859 860 pal[regno] = chan_to_field(red, &info->var.red) 861 | chan_to_field(green, &info->var.green) 862 | chan_to_field(blue, &info->var.blue) 863 | chan_to_field(transp, &info->var.transp); 864 865 return 0; 866 } 867 868 static int hvfb_blank(int blank, struct fb_info *info) 869 { 870 return 1; /* get fb_blank to set the colormap to all black */ 871 } 872 873 static void hvfb_cfb_fillrect(struct fb_info *p, 874 const struct fb_fillrect *rect) 875 { 876 struct hvfb_par *par = p->par; 877 878 cfb_fillrect(p, rect); 879 if (par->synchronous_fb) 880 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 881 else 882 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy, 883 rect->width, rect->height); 884 } 885 886 static void hvfb_cfb_copyarea(struct fb_info *p, 887 const struct fb_copyarea *area) 888 { 889 struct hvfb_par *par = p->par; 890 891 cfb_copyarea(p, area); 892 if (par->synchronous_fb) 893 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 894 else 895 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy, 896 area->width, area->height); 897 } 898 899 static void hvfb_cfb_imageblit(struct fb_info *p, 900 const struct fb_image *image) 901 { 902 struct hvfb_par *par = p->par; 903 904 cfb_imageblit(p, image); 905 if (par->synchronous_fb) 906 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 907 else 908 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy, 909 image->width, image->height); 910 } 911 912 static const struct fb_ops hvfb_ops = { 913 .owner = THIS_MODULE, 914 .fb_check_var = hvfb_check_var, 915 .fb_set_par = hvfb_set_par, 916 .fb_setcolreg = hvfb_setcolreg, 917 .fb_fillrect = hvfb_cfb_fillrect, 918 .fb_copyarea = hvfb_cfb_copyarea, 919 .fb_imageblit = hvfb_cfb_imageblit, 920 .fb_blank = hvfb_blank, 921 }; 922 923 924 /* Get options from kernel paramenter "video=" */ 925 static void hvfb_get_option(struct fb_info *info) 926 { 927 struct hvfb_par *par = info->par; 928 char *opt = NULL, *p; 929 uint x = 0, y = 0; 930 931 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 932 return; 933 934 p = strsep(&opt, "x"); 935 if (!*p || kstrtouint(p, 0, &x) || 936 !opt || !*opt || kstrtouint(opt, 0, &y)) { 937 pr_err("Screen option is invalid: skipped\n"); 938 return; 939 } 940 941 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 942 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) && 943 (x > screen_width_max || y > screen_height_max)) || 944 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 945 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || 946 (par->synthvid_version == SYNTHVID_VERSION_WIN7 && 947 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { 948 pr_err("Screen resolution option is out of range: skipped\n"); 949 return; 950 } 951 952 screen_width = x; 953 screen_height = y; 954 return; 955 } 956 957 /* 958 * Allocate enough contiguous physical memory. 959 * Return physical address if succeeded or -1 if failed. 960 */ 961 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev, 962 unsigned int request_size) 963 { 964 struct page *page = NULL; 965 dma_addr_t dma_handle; 966 void *vmem; 967 phys_addr_t paddr = 0; 968 unsigned int order = get_order(request_size); 969 970 if (request_size == 0) 971 return -1; 972 973 if (order < MAX_ORDER) { 974 /* Call alloc_pages if the size is less than 2^MAX_ORDER */ 975 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 976 if (!page) 977 return -1; 978 979 paddr = (page_to_pfn(page) << PAGE_SHIFT); 980 } else { 981 /* Allocate from CMA */ 982 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64); 983 984 vmem = dma_alloc_coherent(&hdev->device, 985 round_up(request_size, PAGE_SIZE), 986 &dma_handle, 987 GFP_KERNEL | __GFP_NOWARN); 988 989 if (!vmem) 990 return -1; 991 992 paddr = virt_to_phys(vmem); 993 } 994 995 return paddr; 996 } 997 998 /* Release contiguous physical memory */ 999 static void hvfb_release_phymem(struct hv_device *hdev, 1000 phys_addr_t paddr, unsigned int size) 1001 { 1002 unsigned int order = get_order(size); 1003 1004 if (order < MAX_ORDER) 1005 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 1006 else 1007 dma_free_coherent(&hdev->device, 1008 round_up(size, PAGE_SIZE), 1009 phys_to_virt(paddr), 1010 paddr); 1011 } 1012 1013 1014 /* Get framebuffer memory from Hyper-V video pci space */ 1015 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 1016 { 1017 struct hvfb_par *par = info->par; 1018 struct pci_dev *pdev = NULL; 1019 void __iomem *fb_virt; 1020 int gen2vm = efi_enabled(EFI_BOOT); 1021 resource_size_t pot_start, pot_end; 1022 phys_addr_t paddr; 1023 int ret; 1024 1025 info->apertures = alloc_apertures(1); 1026 if (!info->apertures) 1027 return -ENOMEM; 1028 1029 if (!gen2vm) { 1030 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 1031 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 1032 if (!pdev) { 1033 pr_err("Unable to find PCI Hyper-V video\n"); 1034 kfree(info->apertures); 1035 return -ENODEV; 1036 } 1037 1038 info->apertures->ranges[0].base = pci_resource_start(pdev, 0); 1039 info->apertures->ranges[0].size = pci_resource_len(pdev, 0); 1040 1041 /* 1042 * For Gen 1 VM, we can directly use the contiguous memory 1043 * from VM. If we succeed, deferred IO happens directly 1044 * on this allocated framebuffer memory, avoiding extra 1045 * memory copy. 1046 */ 1047 paddr = hvfb_get_phymem(hdev, screen_fb_size); 1048 if (paddr != (phys_addr_t) -1) { 1049 par->mmio_pp = paddr; 1050 par->mmio_vp = par->dio_vp = __va(paddr); 1051 1052 info->fix.smem_start = paddr; 1053 info->fix.smem_len = screen_fb_size; 1054 info->screen_base = par->mmio_vp; 1055 info->screen_size = screen_fb_size; 1056 1057 par->need_docopy = false; 1058 goto getmem_done; 1059 } 1060 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n"); 1061 } else { 1062 info->apertures->ranges[0].base = screen_info.lfb_base; 1063 info->apertures->ranges[0].size = screen_info.lfb_size; 1064 } 1065 1066 /* 1067 * Cannot use the contiguous physical memory. 1068 * Allocate mmio space for framebuffer. 1069 */ 1070 dio_fb_size = 1071 screen_width * screen_height * screen_depth / 8; 1072 1073 if (gen2vm) { 1074 pot_start = 0; 1075 pot_end = -1; 1076 } else { 1077 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) || 1078 pci_resource_len(pdev, 0) < screen_fb_size) { 1079 pr_err("Resource not available or (0x%lx < 0x%lx)\n", 1080 (unsigned long) pci_resource_len(pdev, 0), 1081 (unsigned long) screen_fb_size); 1082 goto err1; 1083 } 1084 1085 pot_end = pci_resource_end(pdev, 0); 1086 pot_start = pot_end - screen_fb_size + 1; 1087 } 1088 1089 ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end, 1090 screen_fb_size, 0x100000, true); 1091 if (ret != 0) { 1092 pr_err("Unable to allocate framebuffer memory\n"); 1093 goto err1; 1094 } 1095 1096 fb_virt = ioremap(par->mem->start, screen_fb_size); 1097 if (!fb_virt) 1098 goto err2; 1099 1100 /* Allocate memory for deferred IO */ 1101 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1102 if (par->dio_vp == NULL) 1103 goto err3; 1104 1105 /* Physical address of FB device */ 1106 par->mmio_pp = par->mem->start; 1107 /* Virtual address of FB device */ 1108 par->mmio_vp = (unsigned char *) fb_virt; 1109 1110 info->fix.smem_start = par->mem->start; 1111 info->fix.smem_len = dio_fb_size; 1112 info->screen_base = par->dio_vp; 1113 info->screen_size = dio_fb_size; 1114 1115 getmem_done: 1116 remove_conflicting_framebuffers(info->apertures, 1117 KBUILD_MODNAME, false); 1118 1119 if (gen2vm) { 1120 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */ 1121 screen_info.lfb_size = 0; 1122 screen_info.lfb_base = 0; 1123 screen_info.orig_video_isVGA = 0; 1124 } else { 1125 pci_dev_put(pdev); 1126 } 1127 kfree(info->apertures); 1128 1129 return 0; 1130 1131 err3: 1132 iounmap(fb_virt); 1133 err2: 1134 vmbus_free_mmio(par->mem->start, screen_fb_size); 1135 par->mem = NULL; 1136 err1: 1137 if (!gen2vm) 1138 pci_dev_put(pdev); 1139 kfree(info->apertures); 1140 1141 return -ENOMEM; 1142 } 1143 1144 /* Release the framebuffer */ 1145 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info) 1146 { 1147 struct hvfb_par *par = info->par; 1148 1149 if (par->need_docopy) { 1150 vfree(par->dio_vp); 1151 iounmap(info->screen_base); 1152 vmbus_free_mmio(par->mem->start, screen_fb_size); 1153 } else { 1154 hvfb_release_phymem(hdev, info->fix.smem_start, 1155 screen_fb_size); 1156 } 1157 1158 par->mem = NULL; 1159 } 1160 1161 1162 static int hvfb_probe(struct hv_device *hdev, 1163 const struct hv_vmbus_device_id *dev_id) 1164 { 1165 struct fb_info *info; 1166 struct hvfb_par *par; 1167 int ret; 1168 1169 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1170 if (!info) 1171 return -ENOMEM; 1172 1173 par = info->par; 1174 par->info = info; 1175 par->fb_ready = false; 1176 par->need_docopy = true; 1177 init_completion(&par->wait); 1178 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1179 1180 par->delayed_refresh = false; 1181 spin_lock_init(&par->delayed_refresh_lock); 1182 par->x1 = par->y1 = INT_MAX; 1183 par->x2 = par->y2 = 0; 1184 1185 /* Connect to VSP */ 1186 hv_set_drvdata(hdev, info); 1187 ret = synthvid_connect_vsp(hdev); 1188 if (ret) { 1189 pr_err("Unable to connect to VSP\n"); 1190 goto error1; 1191 } 1192 1193 hvfb_get_option(info); 1194 pr_info("Screen resolution: %dx%d, Color depth: %d\n", 1195 screen_width, screen_height, screen_depth); 1196 1197 ret = hvfb_getmem(hdev, info); 1198 if (ret) { 1199 pr_err("No memory for framebuffer\n"); 1200 goto error2; 1201 } 1202 1203 /* Set up fb_info */ 1204 info->flags = FBINFO_DEFAULT; 1205 1206 info->var.xres_virtual = info->var.xres = screen_width; 1207 info->var.yres_virtual = info->var.yres = screen_height; 1208 info->var.bits_per_pixel = screen_depth; 1209 1210 if (info->var.bits_per_pixel == 16) { 1211 info->var.red = (struct fb_bitfield){11, 5, 0}; 1212 info->var.green = (struct fb_bitfield){5, 6, 0}; 1213 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1214 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1215 } else { 1216 info->var.red = (struct fb_bitfield){16, 8, 0}; 1217 info->var.green = (struct fb_bitfield){8, 8, 0}; 1218 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1219 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1220 } 1221 1222 info->var.activate = FB_ACTIVATE_NOW; 1223 info->var.height = -1; 1224 info->var.width = -1; 1225 info->var.vmode = FB_VMODE_NONINTERLACED; 1226 1227 strcpy(info->fix.id, KBUILD_MODNAME); 1228 info->fix.type = FB_TYPE_PACKED_PIXELS; 1229 info->fix.visual = FB_VISUAL_TRUECOLOR; 1230 info->fix.line_length = screen_width * screen_depth / 8; 1231 info->fix.accel = FB_ACCEL_NONE; 1232 1233 info->fbops = &hvfb_ops; 1234 info->pseudo_palette = par->pseudo_palette; 1235 1236 /* Initialize deferred IO */ 1237 info->fbdefio = &synthvid_defio; 1238 fb_deferred_io_init(info); 1239 1240 /* Send config to host */ 1241 ret = synthvid_send_config(hdev); 1242 if (ret) 1243 goto error; 1244 1245 ret = register_framebuffer(info); 1246 if (ret) { 1247 pr_err("Unable to register framebuffer\n"); 1248 goto error; 1249 } 1250 1251 par->fb_ready = true; 1252 1253 par->synchronous_fb = false; 1254 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1255 atomic_notifier_chain_register(&panic_notifier_list, 1256 &par->hvfb_panic_nb); 1257 1258 return 0; 1259 1260 error: 1261 fb_deferred_io_cleanup(info); 1262 hvfb_putmem(hdev, info); 1263 error2: 1264 vmbus_close(hdev->channel); 1265 error1: 1266 cancel_delayed_work_sync(&par->dwork); 1267 hv_set_drvdata(hdev, NULL); 1268 framebuffer_release(info); 1269 return ret; 1270 } 1271 1272 1273 static int hvfb_remove(struct hv_device *hdev) 1274 { 1275 struct fb_info *info = hv_get_drvdata(hdev); 1276 struct hvfb_par *par = info->par; 1277 1278 atomic_notifier_chain_unregister(&panic_notifier_list, 1279 &par->hvfb_panic_nb); 1280 1281 par->update = false; 1282 par->fb_ready = false; 1283 1284 fb_deferred_io_cleanup(info); 1285 1286 unregister_framebuffer(info); 1287 cancel_delayed_work_sync(&par->dwork); 1288 1289 vmbus_close(hdev->channel); 1290 hv_set_drvdata(hdev, NULL); 1291 1292 hvfb_putmem(hdev, info); 1293 framebuffer_release(info); 1294 1295 return 0; 1296 } 1297 1298 static int hvfb_suspend(struct hv_device *hdev) 1299 { 1300 struct fb_info *info = hv_get_drvdata(hdev); 1301 struct hvfb_par *par = info->par; 1302 1303 console_lock(); 1304 1305 /* 1 means do suspend */ 1306 fb_set_suspend(info, 1); 1307 1308 cancel_delayed_work_sync(&par->dwork); 1309 cancel_delayed_work_sync(&info->deferred_work); 1310 1311 par->update_saved = par->update; 1312 par->update = false; 1313 par->fb_ready = false; 1314 1315 vmbus_close(hdev->channel); 1316 1317 console_unlock(); 1318 1319 return 0; 1320 } 1321 1322 static int hvfb_resume(struct hv_device *hdev) 1323 { 1324 struct fb_info *info = hv_get_drvdata(hdev); 1325 struct hvfb_par *par = info->par; 1326 int ret; 1327 1328 console_lock(); 1329 1330 ret = synthvid_connect_vsp(hdev); 1331 if (ret != 0) 1332 goto out; 1333 1334 ret = synthvid_send_config(hdev); 1335 if (ret != 0) { 1336 vmbus_close(hdev->channel); 1337 goto out; 1338 } 1339 1340 par->fb_ready = true; 1341 par->update = par->update_saved; 1342 1343 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1344 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1345 1346 /* 0 means do resume */ 1347 fb_set_suspend(info, 0); 1348 1349 out: 1350 console_unlock(); 1351 1352 return ret; 1353 } 1354 1355 1356 static const struct pci_device_id pci_stub_id_table[] = { 1357 { 1358 .vendor = PCI_VENDOR_ID_MICROSOFT, 1359 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1360 }, 1361 { /* end of list */ } 1362 }; 1363 1364 static const struct hv_vmbus_device_id id_table[] = { 1365 /* Synthetic Video Device GUID */ 1366 {HV_SYNTHVID_GUID}, 1367 {} 1368 }; 1369 1370 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1371 MODULE_DEVICE_TABLE(vmbus, id_table); 1372 1373 static struct hv_driver hvfb_drv = { 1374 .name = KBUILD_MODNAME, 1375 .id_table = id_table, 1376 .probe = hvfb_probe, 1377 .remove = hvfb_remove, 1378 .suspend = hvfb_suspend, 1379 .resume = hvfb_resume, 1380 .driver = { 1381 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1382 }, 1383 }; 1384 1385 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1386 const struct pci_device_id *ent) 1387 { 1388 return 0; 1389 } 1390 1391 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1392 { 1393 } 1394 1395 static struct pci_driver hvfb_pci_stub_driver = { 1396 .name = KBUILD_MODNAME, 1397 .id_table = pci_stub_id_table, 1398 .probe = hvfb_pci_stub_probe, 1399 .remove = hvfb_pci_stub_remove, 1400 .driver = { 1401 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1402 } 1403 }; 1404 1405 static int __init hvfb_drv_init(void) 1406 { 1407 int ret; 1408 1409 ret = vmbus_driver_register(&hvfb_drv); 1410 if (ret != 0) 1411 return ret; 1412 1413 ret = pci_register_driver(&hvfb_pci_stub_driver); 1414 if (ret != 0) { 1415 vmbus_driver_unregister(&hvfb_drv); 1416 return ret; 1417 } 1418 1419 return 0; 1420 } 1421 1422 static void __exit hvfb_drv_exit(void) 1423 { 1424 pci_unregister_driver(&hvfb_pci_stub_driver); 1425 vmbus_driver_unregister(&hvfb_drv); 1426 } 1427 1428 module_init(hvfb_drv_init); 1429 module_exit(hvfb_drv_exit); 1430 1431 MODULE_LICENSE("GPL"); 1432 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1433