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/panic_notifier.h> 56 #include <linux/efi.h> 57 #include <linux/console.h> 58 59 #include <linux/hyperv.h> 60 61 62 /* Hyper-V Synthetic Video Protocol definitions and structures */ 63 #define MAX_VMBUS_PKT_SIZE 0x4000 64 65 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) 66 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) 67 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) 68 #define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5) 69 70 #define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff) 71 #define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16) 72 73 #define SYNTHVID_DEPTH_WIN7 16 74 #define SYNTHVID_DEPTH_WIN8 32 75 76 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024) 77 #define SYNTHVID_WIDTH_MAX_WIN7 1600 78 #define SYNTHVID_HEIGHT_MAX_WIN7 1200 79 80 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) 81 82 #define PCI_VENDOR_ID_MICROSOFT 0x1414 83 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 84 85 86 enum pipe_msg_type { 87 PIPE_MSG_INVALID, 88 PIPE_MSG_DATA, 89 PIPE_MSG_MAX 90 }; 91 92 struct pipe_msg_hdr { 93 u32 type; 94 u32 size; /* size of message after this field */ 95 } __packed; 96 97 98 enum synthvid_msg_type { 99 SYNTHVID_ERROR = 0, 100 SYNTHVID_VERSION_REQUEST = 1, 101 SYNTHVID_VERSION_RESPONSE = 2, 102 SYNTHVID_VRAM_LOCATION = 3, 103 SYNTHVID_VRAM_LOCATION_ACK = 4, 104 SYNTHVID_SITUATION_UPDATE = 5, 105 SYNTHVID_SITUATION_UPDATE_ACK = 6, 106 SYNTHVID_POINTER_POSITION = 7, 107 SYNTHVID_POINTER_SHAPE = 8, 108 SYNTHVID_FEATURE_CHANGE = 9, 109 SYNTHVID_DIRT = 10, 110 SYNTHVID_RESOLUTION_REQUEST = 13, 111 SYNTHVID_RESOLUTION_RESPONSE = 14, 112 113 SYNTHVID_MAX = 15 114 }; 115 116 #define SYNTHVID_EDID_BLOCK_SIZE 128 117 #define SYNTHVID_MAX_RESOLUTION_COUNT 64 118 119 struct hvd_screen_info { 120 u16 width; 121 u16 height; 122 } __packed; 123 124 struct synthvid_msg_hdr { 125 u32 type; 126 u32 size; /* size of this header + payload after this field*/ 127 } __packed; 128 129 struct synthvid_version_req { 130 u32 version; 131 } __packed; 132 133 struct synthvid_version_resp { 134 u32 version; 135 u8 is_accepted; 136 u8 max_video_outputs; 137 } __packed; 138 139 struct synthvid_supported_resolution_req { 140 u8 maximum_resolution_count; 141 } __packed; 142 143 struct synthvid_supported_resolution_resp { 144 u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE]; 145 u8 resolution_count; 146 u8 default_resolution_index; 147 u8 is_standard; 148 struct hvd_screen_info 149 supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT]; 150 } __packed; 151 152 struct synthvid_vram_location { 153 u64 user_ctx; 154 u8 is_vram_gpa_specified; 155 u64 vram_gpa; 156 } __packed; 157 158 struct synthvid_vram_location_ack { 159 u64 user_ctx; 160 } __packed; 161 162 struct video_output_situation { 163 u8 active; 164 u32 vram_offset; 165 u8 depth_bits; 166 u32 width_pixels; 167 u32 height_pixels; 168 u32 pitch_bytes; 169 } __packed; 170 171 struct synthvid_situation_update { 172 u64 user_ctx; 173 u8 video_output_count; 174 struct video_output_situation video_output[1]; 175 } __packed; 176 177 struct synthvid_situation_update_ack { 178 u64 user_ctx; 179 } __packed; 180 181 struct synthvid_pointer_position { 182 u8 is_visible; 183 u8 video_output; 184 s32 image_x; 185 s32 image_y; 186 } __packed; 187 188 189 #define CURSOR_MAX_X 96 190 #define CURSOR_MAX_Y 96 191 #define CURSOR_ARGB_PIXEL_SIZE 4 192 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) 193 #define CURSOR_COMPLETE (-1) 194 195 struct synthvid_pointer_shape { 196 u8 part_idx; 197 u8 is_argb; 198 u32 width; /* CURSOR_MAX_X at most */ 199 u32 height; /* CURSOR_MAX_Y at most */ 200 u32 hot_x; /* hotspot relative to upper-left of pointer image */ 201 u32 hot_y; 202 u8 data[4]; 203 } __packed; 204 205 struct synthvid_feature_change { 206 u8 is_dirt_needed; 207 u8 is_ptr_pos_needed; 208 u8 is_ptr_shape_needed; 209 u8 is_situ_needed; 210 } __packed; 211 212 struct rect { 213 s32 x1, y1; /* top left corner */ 214 s32 x2, y2; /* bottom right corner, exclusive */ 215 } __packed; 216 217 struct synthvid_dirt { 218 u8 video_output; 219 u8 dirt_count; 220 struct rect rect[1]; 221 } __packed; 222 223 struct synthvid_msg { 224 struct pipe_msg_hdr pipe_hdr; 225 struct synthvid_msg_hdr vid_hdr; 226 union { 227 struct synthvid_version_req ver_req; 228 struct synthvid_version_resp ver_resp; 229 struct synthvid_vram_location vram; 230 struct synthvid_vram_location_ack vram_ack; 231 struct synthvid_situation_update situ; 232 struct synthvid_situation_update_ack situ_ack; 233 struct synthvid_pointer_position ptr_pos; 234 struct synthvid_pointer_shape ptr_shape; 235 struct synthvid_feature_change feature_chg; 236 struct synthvid_dirt dirt; 237 struct synthvid_supported_resolution_req resolution_req; 238 struct synthvid_supported_resolution_resp resolution_resp; 239 }; 240 } __packed; 241 242 243 /* FB driver definitions and structures */ 244 #define HVFB_WIDTH 1152 /* default screen width */ 245 #define HVFB_HEIGHT 864 /* default screen height */ 246 #define HVFB_WIDTH_MIN 640 247 #define HVFB_HEIGHT_MIN 480 248 249 #define RING_BUFSIZE (256 * 1024) 250 #define VSP_TIMEOUT (10 * HZ) 251 #define HVFB_UPDATE_DELAY (HZ / 20) 252 #define HVFB_ONDEMAND_THROTTLE (HZ / 20) 253 254 struct hvfb_par { 255 struct fb_info *info; 256 struct resource *mem; 257 bool fb_ready; /* fb device is ready */ 258 struct completion wait; 259 u32 synthvid_version; 260 261 struct delayed_work dwork; 262 bool update; 263 bool update_saved; /* The value of 'update' before hibernation */ 264 265 u32 pseudo_palette[16]; 266 u8 init_buf[MAX_VMBUS_PKT_SIZE]; 267 u8 recv_buf[MAX_VMBUS_PKT_SIZE]; 268 269 /* If true, the VSC notifies the VSP on every framebuffer change */ 270 bool synchronous_fb; 271 272 /* If true, need to copy from deferred IO mem to framebuffer mem */ 273 bool need_docopy; 274 275 struct notifier_block hvfb_panic_nb; 276 277 /* Memory for deferred IO and frame buffer itself */ 278 unsigned char *dio_vp; 279 unsigned char *mmio_vp; 280 phys_addr_t mmio_pp; 281 282 /* Dirty rectangle, protected by delayed_refresh_lock */ 283 int x1, y1, x2, y2; 284 bool delayed_refresh; 285 spinlock_t delayed_refresh_lock; 286 }; 287 288 static uint screen_width = HVFB_WIDTH; 289 static uint screen_height = HVFB_HEIGHT; 290 static uint screen_width_max = HVFB_WIDTH; 291 static uint screen_height_max = HVFB_HEIGHT; 292 static uint screen_depth; 293 static uint screen_fb_size; 294 static uint dio_fb_size; /* FB size for deferred IO */ 295 296 /* Send message to Hyper-V host */ 297 static inline int synthvid_send(struct hv_device *hdev, 298 struct synthvid_msg *msg) 299 { 300 static atomic64_t request_id = ATOMIC64_INIT(0); 301 int ret; 302 303 msg->pipe_hdr.type = PIPE_MSG_DATA; 304 msg->pipe_hdr.size = msg->vid_hdr.size; 305 306 ret = vmbus_sendpacket(hdev->channel, msg, 307 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), 308 atomic64_inc_return(&request_id), 309 VM_PKT_DATA_INBAND, 0); 310 311 if (ret) 312 pr_err_ratelimited("Unable to send packet via vmbus; error %d\n", ret); 313 314 return ret; 315 } 316 317 318 /* Send screen resolution info to host */ 319 static int synthvid_send_situ(struct hv_device *hdev) 320 { 321 struct fb_info *info = hv_get_drvdata(hdev); 322 struct synthvid_msg msg; 323 324 if (!info) 325 return -ENODEV; 326 327 memset(&msg, 0, sizeof(struct synthvid_msg)); 328 329 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; 330 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 331 sizeof(struct synthvid_situation_update); 332 msg.situ.user_ctx = 0; 333 msg.situ.video_output_count = 1; 334 msg.situ.video_output[0].active = 1; 335 msg.situ.video_output[0].vram_offset = 0; 336 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; 337 msg.situ.video_output[0].width_pixels = info->var.xres; 338 msg.situ.video_output[0].height_pixels = info->var.yres; 339 msg.situ.video_output[0].pitch_bytes = info->fix.line_length; 340 341 synthvid_send(hdev, &msg); 342 343 return 0; 344 } 345 346 /* Send mouse pointer info to host */ 347 static int synthvid_send_ptr(struct hv_device *hdev) 348 { 349 struct synthvid_msg msg; 350 351 memset(&msg, 0, sizeof(struct synthvid_msg)); 352 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; 353 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 354 sizeof(struct synthvid_pointer_position); 355 msg.ptr_pos.is_visible = 1; 356 msg.ptr_pos.video_output = 0; 357 msg.ptr_pos.image_x = 0; 358 msg.ptr_pos.image_y = 0; 359 synthvid_send(hdev, &msg); 360 361 memset(&msg, 0, sizeof(struct synthvid_msg)); 362 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; 363 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 364 sizeof(struct synthvid_pointer_shape); 365 msg.ptr_shape.part_idx = CURSOR_COMPLETE; 366 msg.ptr_shape.is_argb = 1; 367 msg.ptr_shape.width = 1; 368 msg.ptr_shape.height = 1; 369 msg.ptr_shape.hot_x = 0; 370 msg.ptr_shape.hot_y = 0; 371 msg.ptr_shape.data[0] = 0; 372 msg.ptr_shape.data[1] = 1; 373 msg.ptr_shape.data[2] = 1; 374 msg.ptr_shape.data[3] = 1; 375 synthvid_send(hdev, &msg); 376 377 return 0; 378 } 379 380 /* Send updated screen area (dirty rectangle) location to host */ 381 static int 382 synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2) 383 { 384 struct hv_device *hdev = device_to_hv_device(info->device); 385 struct synthvid_msg msg; 386 387 memset(&msg, 0, sizeof(struct synthvid_msg)); 388 if (x2 == INT_MAX) 389 x2 = info->var.xres; 390 if (y2 == INT_MAX) 391 y2 = info->var.yres; 392 393 msg.vid_hdr.type = SYNTHVID_DIRT; 394 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 395 sizeof(struct synthvid_dirt); 396 msg.dirt.video_output = 0; 397 msg.dirt.dirt_count = 1; 398 msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1; 399 msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1; 400 msg.dirt.rect[0].x2 = 401 (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2; 402 msg.dirt.rect[0].y2 = 403 (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2; 404 405 synthvid_send(hdev, &msg); 406 407 return 0; 408 } 409 410 static void hvfb_docopy(struct hvfb_par *par, 411 unsigned long offset, 412 unsigned long size) 413 { 414 if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready || 415 size == 0 || offset >= dio_fb_size) 416 return; 417 418 if (offset + size > dio_fb_size) 419 size = dio_fb_size - offset; 420 421 memcpy(par->mmio_vp + offset, par->dio_vp + offset, size); 422 } 423 424 /* Deferred IO callback */ 425 static void synthvid_deferred_io(struct fb_info *p, 426 struct list_head *pagelist) 427 { 428 struct hvfb_par *par = p->par; 429 struct page *page; 430 unsigned long start, end; 431 int y1, y2, miny, maxy; 432 433 miny = INT_MAX; 434 maxy = 0; 435 436 /* 437 * Merge dirty pages. It is possible that last page cross 438 * over the end of frame buffer row yres. This is taken care of 439 * in synthvid_update function by clamping the y2 440 * value to yres. 441 */ 442 list_for_each_entry(page, pagelist, lru) { 443 start = page->index << PAGE_SHIFT; 444 end = start + PAGE_SIZE - 1; 445 y1 = start / p->fix.line_length; 446 y2 = end / p->fix.line_length; 447 miny = min_t(int, miny, y1); 448 maxy = max_t(int, maxy, y2); 449 450 /* Copy from dio space to mmio address */ 451 if (par->fb_ready && par->need_docopy) 452 hvfb_docopy(par, start, PAGE_SIZE); 453 } 454 455 if (par->fb_ready && par->update) 456 synthvid_update(p, 0, miny, p->var.xres, maxy + 1); 457 } 458 459 static struct fb_deferred_io synthvid_defio = { 460 .delay = HZ / 20, 461 .deferred_io = synthvid_deferred_io, 462 }; 463 464 /* 465 * Actions on received messages from host: 466 * Complete the wait event. 467 * Or, reply with screen and cursor info. 468 */ 469 static void synthvid_recv_sub(struct hv_device *hdev) 470 { 471 struct fb_info *info = hv_get_drvdata(hdev); 472 struct hvfb_par *par; 473 struct synthvid_msg *msg; 474 475 if (!info) 476 return; 477 478 par = info->par; 479 msg = (struct synthvid_msg *)par->recv_buf; 480 481 /* Complete the wait event */ 482 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || 483 msg->vid_hdr.type == SYNTHVID_RESOLUTION_RESPONSE || 484 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { 485 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); 486 complete(&par->wait); 487 return; 488 } 489 490 /* Reply with screen and cursor info */ 491 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { 492 if (par->fb_ready) { 493 synthvid_send_ptr(hdev); 494 synthvid_send_situ(hdev); 495 } 496 497 par->update = msg->feature_chg.is_dirt_needed; 498 if (par->update) 499 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 500 } 501 } 502 503 /* Receive callback for messages from the host */ 504 static void synthvid_receive(void *ctx) 505 { 506 struct hv_device *hdev = ctx; 507 struct fb_info *info = hv_get_drvdata(hdev); 508 struct hvfb_par *par; 509 struct synthvid_msg *recv_buf; 510 u32 bytes_recvd; 511 u64 req_id; 512 int ret; 513 514 if (!info) 515 return; 516 517 par = info->par; 518 recv_buf = (struct synthvid_msg *)par->recv_buf; 519 520 do { 521 ret = vmbus_recvpacket(hdev->channel, recv_buf, 522 MAX_VMBUS_PKT_SIZE, 523 &bytes_recvd, &req_id); 524 if (bytes_recvd > 0 && 525 recv_buf->pipe_hdr.type == PIPE_MSG_DATA) 526 synthvid_recv_sub(hdev); 527 } while (bytes_recvd > 0 && ret == 0); 528 } 529 530 /* Check if the ver1 version is equal or greater than ver2 */ 531 static inline bool synthvid_ver_ge(u32 ver1, u32 ver2) 532 { 533 if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) || 534 (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) && 535 SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2))) 536 return true; 537 538 return false; 539 } 540 541 /* Check synthetic video protocol version with the host */ 542 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) 543 { 544 struct fb_info *info = hv_get_drvdata(hdev); 545 struct hvfb_par *par = info->par; 546 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 547 int ret = 0; 548 unsigned long t; 549 550 memset(msg, 0, sizeof(struct synthvid_msg)); 551 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; 552 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 553 sizeof(struct synthvid_version_req); 554 msg->ver_req.version = ver; 555 synthvid_send(hdev, msg); 556 557 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 558 if (!t) { 559 pr_err("Time out on waiting version response\n"); 560 ret = -ETIMEDOUT; 561 goto out; 562 } 563 if (!msg->ver_resp.is_accepted) { 564 ret = -ENODEV; 565 goto out; 566 } 567 568 par->synthvid_version = ver; 569 pr_info("Synthvid Version major %d, minor %d\n", 570 SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver)); 571 572 out: 573 return ret; 574 } 575 576 /* Get current resolution from the host */ 577 static int synthvid_get_supported_resolution(struct hv_device *hdev) 578 { 579 struct fb_info *info = hv_get_drvdata(hdev); 580 struct hvfb_par *par = info->par; 581 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 582 int ret = 0; 583 unsigned long t; 584 u8 index; 585 int i; 586 587 memset(msg, 0, sizeof(struct synthvid_msg)); 588 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 589 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 590 sizeof(struct synthvid_supported_resolution_req); 591 592 msg->resolution_req.maximum_resolution_count = 593 SYNTHVID_MAX_RESOLUTION_COUNT; 594 synthvid_send(hdev, msg); 595 596 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 597 if (!t) { 598 pr_err("Time out on waiting resolution response\n"); 599 ret = -ETIMEDOUT; 600 goto out; 601 } 602 603 if (msg->resolution_resp.resolution_count == 0) { 604 pr_err("No supported resolutions\n"); 605 ret = -ENODEV; 606 goto out; 607 } 608 609 index = msg->resolution_resp.default_resolution_index; 610 if (index >= msg->resolution_resp.resolution_count) { 611 pr_err("Invalid resolution index: %d\n", index); 612 ret = -ENODEV; 613 goto out; 614 } 615 616 for (i = 0; i < msg->resolution_resp.resolution_count; i++) { 617 screen_width_max = max_t(unsigned int, screen_width_max, 618 msg->resolution_resp.supported_resolution[i].width); 619 screen_height_max = max_t(unsigned int, screen_height_max, 620 msg->resolution_resp.supported_resolution[i].height); 621 } 622 623 screen_width = 624 msg->resolution_resp.supported_resolution[index].width; 625 screen_height = 626 msg->resolution_resp.supported_resolution[index].height; 627 628 out: 629 return ret; 630 } 631 632 /* Connect to VSP (Virtual Service Provider) on host */ 633 static int synthvid_connect_vsp(struct hv_device *hdev) 634 { 635 struct fb_info *info = hv_get_drvdata(hdev); 636 struct hvfb_par *par = info->par; 637 int ret; 638 639 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 640 NULL, 0, synthvid_receive, hdev); 641 if (ret) { 642 pr_err("Unable to open vmbus channel\n"); 643 return ret; 644 } 645 646 /* Negotiate the protocol version with host */ 647 switch (vmbus_proto_version) { 648 case VERSION_WIN10: 649 case VERSION_WIN10_V5: 650 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 651 if (!ret) 652 break; 653 fallthrough; 654 case VERSION_WIN8: 655 case VERSION_WIN8_1: 656 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 657 if (!ret) 658 break; 659 fallthrough; 660 case VERSION_WS2008: 661 case VERSION_WIN7: 662 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); 663 break; 664 default: 665 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 666 break; 667 } 668 669 if (ret) { 670 pr_err("Synthetic video device version not accepted\n"); 671 goto error; 672 } 673 674 if (par->synthvid_version == SYNTHVID_VERSION_WIN7) 675 screen_depth = SYNTHVID_DEPTH_WIN7; 676 else 677 screen_depth = SYNTHVID_DEPTH_WIN8; 678 679 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 680 ret = synthvid_get_supported_resolution(hdev); 681 if (ret) 682 pr_info("Failed to get supported resolution from host, use default\n"); 683 } 684 685 screen_fb_size = hdev->channel->offermsg.offer. 686 mmio_megabytes * 1024 * 1024; 687 688 return 0; 689 690 error: 691 vmbus_close(hdev->channel); 692 return ret; 693 } 694 695 /* Send VRAM and Situation messages to the host */ 696 static int synthvid_send_config(struct hv_device *hdev) 697 { 698 struct fb_info *info = hv_get_drvdata(hdev); 699 struct hvfb_par *par = info->par; 700 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 701 int ret = 0; 702 unsigned long t; 703 704 /* Send VRAM location */ 705 memset(msg, 0, sizeof(struct synthvid_msg)); 706 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 707 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 708 sizeof(struct synthvid_vram_location); 709 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 710 msg->vram.is_vram_gpa_specified = 1; 711 synthvid_send(hdev, msg); 712 713 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 714 if (!t) { 715 pr_err("Time out on waiting vram location ack\n"); 716 ret = -ETIMEDOUT; 717 goto out; 718 } 719 if (msg->vram_ack.user_ctx != par->mmio_pp) { 720 pr_err("Unable to set VRAM location\n"); 721 ret = -ENODEV; 722 goto out; 723 } 724 725 /* Send pointer and situation update */ 726 synthvid_send_ptr(hdev); 727 synthvid_send_situ(hdev); 728 729 out: 730 return ret; 731 } 732 733 734 /* 735 * Delayed work callback: 736 * It is scheduled to call whenever update request is received and it has 737 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 738 */ 739 static void hvfb_update_work(struct work_struct *w) 740 { 741 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 742 struct fb_info *info = par->info; 743 unsigned long flags; 744 int x1, x2, y1, y2; 745 int j; 746 747 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 748 /* Reset the request flag */ 749 par->delayed_refresh = false; 750 751 /* Store the dirty rectangle to local variables */ 752 x1 = par->x1; 753 x2 = par->x2; 754 y1 = par->y1; 755 y2 = par->y2; 756 757 /* Clear dirty rectangle */ 758 par->x1 = par->y1 = INT_MAX; 759 par->x2 = par->y2 = 0; 760 761 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 762 763 if (x1 > info->var.xres || x2 > info->var.xres || 764 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 765 return; 766 767 /* Copy the dirty rectangle to frame buffer memory */ 768 if (par->need_docopy) 769 for (j = y1; j < y2; j++) 770 hvfb_docopy(par, 771 j * info->fix.line_length + 772 (x1 * screen_depth / 8), 773 (x2 - x1) * screen_depth / 8); 774 775 /* Refresh */ 776 if (par->fb_ready && par->update) 777 synthvid_update(info, x1, y1, x2, y2); 778 } 779 780 /* 781 * Control the on-demand refresh frequency. It schedules a delayed 782 * screen update if it has not yet. 783 */ 784 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 785 int x1, int y1, int w, int h) 786 { 787 unsigned long flags; 788 int x2 = x1 + w; 789 int y2 = y1 + h; 790 791 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 792 793 /* Merge dirty rectangle */ 794 par->x1 = min_t(int, par->x1, x1); 795 par->y1 = min_t(int, par->y1, y1); 796 par->x2 = max_t(int, par->x2, x2); 797 par->y2 = max_t(int, par->y2, y2); 798 799 /* Schedule a delayed screen update if not yet */ 800 if (par->delayed_refresh == false) { 801 schedule_delayed_work(&par->dwork, 802 HVFB_ONDEMAND_THROTTLE); 803 par->delayed_refresh = true; 804 } 805 806 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 807 } 808 809 static int hvfb_on_panic(struct notifier_block *nb, 810 unsigned long e, void *p) 811 { 812 struct hvfb_par *par; 813 struct fb_info *info; 814 815 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 816 par->synchronous_fb = true; 817 info = par->info; 818 if (par->need_docopy) 819 hvfb_docopy(par, 0, dio_fb_size); 820 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 821 822 return NOTIFY_DONE; 823 } 824 825 /* Framebuffer operation handlers */ 826 827 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 828 { 829 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 830 var->xres > screen_width || var->yres > screen_height || 831 var->bits_per_pixel != screen_depth) 832 return -EINVAL; 833 834 var->xres_virtual = var->xres; 835 var->yres_virtual = var->yres; 836 837 return 0; 838 } 839 840 static int hvfb_set_par(struct fb_info *info) 841 { 842 struct hv_device *hdev = device_to_hv_device(info->device); 843 844 return synthvid_send_situ(hdev); 845 } 846 847 848 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 849 { 850 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 851 } 852 853 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 854 unsigned blue, unsigned transp, struct fb_info *info) 855 { 856 u32 *pal = info->pseudo_palette; 857 858 if (regno > 15) 859 return -EINVAL; 860 861 pal[regno] = chan_to_field(red, &info->var.red) 862 | chan_to_field(green, &info->var.green) 863 | chan_to_field(blue, &info->var.blue) 864 | chan_to_field(transp, &info->var.transp); 865 866 return 0; 867 } 868 869 static int hvfb_blank(int blank, struct fb_info *info) 870 { 871 return 1; /* get fb_blank to set the colormap to all black */ 872 } 873 874 static void hvfb_cfb_fillrect(struct fb_info *p, 875 const struct fb_fillrect *rect) 876 { 877 struct hvfb_par *par = p->par; 878 879 cfb_fillrect(p, rect); 880 if (par->synchronous_fb) 881 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 882 else 883 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy, 884 rect->width, rect->height); 885 } 886 887 static void hvfb_cfb_copyarea(struct fb_info *p, 888 const struct fb_copyarea *area) 889 { 890 struct hvfb_par *par = p->par; 891 892 cfb_copyarea(p, area); 893 if (par->synchronous_fb) 894 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 895 else 896 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy, 897 area->width, area->height); 898 } 899 900 static void hvfb_cfb_imageblit(struct fb_info *p, 901 const struct fb_image *image) 902 { 903 struct hvfb_par *par = p->par; 904 905 cfb_imageblit(p, image); 906 if (par->synchronous_fb) 907 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 908 else 909 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy, 910 image->width, image->height); 911 } 912 913 static const struct fb_ops hvfb_ops = { 914 .owner = THIS_MODULE, 915 .fb_check_var = hvfb_check_var, 916 .fb_set_par = hvfb_set_par, 917 .fb_setcolreg = hvfb_setcolreg, 918 .fb_fillrect = hvfb_cfb_fillrect, 919 .fb_copyarea = hvfb_cfb_copyarea, 920 .fb_imageblit = hvfb_cfb_imageblit, 921 .fb_blank = hvfb_blank, 922 }; 923 924 925 /* Get options from kernel paramenter "video=" */ 926 static void hvfb_get_option(struct fb_info *info) 927 { 928 struct hvfb_par *par = info->par; 929 char *opt = NULL, *p; 930 uint x = 0, y = 0; 931 932 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 933 return; 934 935 p = strsep(&opt, "x"); 936 if (!*p || kstrtouint(p, 0, &x) || 937 !opt || !*opt || kstrtouint(opt, 0, &y)) { 938 pr_err("Screen option is invalid: skipped\n"); 939 return; 940 } 941 942 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 943 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) && 944 (x > screen_width_max || y > screen_height_max)) || 945 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 946 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || 947 (par->synthvid_version == SYNTHVID_VERSION_WIN7 && 948 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { 949 pr_err("Screen resolution option is out of range: skipped\n"); 950 return; 951 } 952 953 screen_width = x; 954 screen_height = y; 955 return; 956 } 957 958 /* 959 * Allocate enough contiguous physical memory. 960 * Return physical address if succeeded or -1 if failed. 961 */ 962 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev, 963 unsigned int request_size) 964 { 965 struct page *page = NULL; 966 dma_addr_t dma_handle; 967 void *vmem; 968 phys_addr_t paddr = 0; 969 unsigned int order = get_order(request_size); 970 971 if (request_size == 0) 972 return -1; 973 974 if (order < MAX_ORDER) { 975 /* Call alloc_pages if the size is less than 2^MAX_ORDER */ 976 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 977 if (!page) 978 return -1; 979 980 paddr = (page_to_pfn(page) << PAGE_SHIFT); 981 } else { 982 /* Allocate from CMA */ 983 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64); 984 985 vmem = dma_alloc_coherent(&hdev->device, 986 round_up(request_size, PAGE_SIZE), 987 &dma_handle, 988 GFP_KERNEL | __GFP_NOWARN); 989 990 if (!vmem) 991 return -1; 992 993 paddr = virt_to_phys(vmem); 994 } 995 996 return paddr; 997 } 998 999 /* Release contiguous physical memory */ 1000 static void hvfb_release_phymem(struct hv_device *hdev, 1001 phys_addr_t paddr, unsigned int size) 1002 { 1003 unsigned int order = get_order(size); 1004 1005 if (order < MAX_ORDER) 1006 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 1007 else 1008 dma_free_coherent(&hdev->device, 1009 round_up(size, PAGE_SIZE), 1010 phys_to_virt(paddr), 1011 paddr); 1012 } 1013 1014 1015 /* Get framebuffer memory from Hyper-V video pci space */ 1016 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 1017 { 1018 struct hvfb_par *par = info->par; 1019 struct pci_dev *pdev = NULL; 1020 void __iomem *fb_virt; 1021 int gen2vm = efi_enabled(EFI_BOOT); 1022 resource_size_t pot_start, pot_end; 1023 phys_addr_t paddr; 1024 int ret; 1025 1026 info->apertures = alloc_apertures(1); 1027 if (!info->apertures) 1028 return -ENOMEM; 1029 1030 if (!gen2vm) { 1031 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 1032 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 1033 if (!pdev) { 1034 pr_err("Unable to find PCI Hyper-V video\n"); 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 /* 1097 * Map the VRAM cacheable for performance. This is also required for 1098 * VM Connect to display properly for ARM64 Linux VM, as the host also 1099 * maps the VRAM cacheable. 1100 */ 1101 fb_virt = ioremap_cache(par->mem->start, screen_fb_size); 1102 if (!fb_virt) 1103 goto err2; 1104 1105 /* Allocate memory for deferred IO */ 1106 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1107 if (par->dio_vp == NULL) 1108 goto err3; 1109 1110 /* Physical address of FB device */ 1111 par->mmio_pp = par->mem->start; 1112 /* Virtual address of FB device */ 1113 par->mmio_vp = (unsigned char *) fb_virt; 1114 1115 info->fix.smem_start = par->mem->start; 1116 info->fix.smem_len = dio_fb_size; 1117 info->screen_base = par->dio_vp; 1118 info->screen_size = dio_fb_size; 1119 1120 getmem_done: 1121 remove_conflicting_framebuffers(info->apertures, 1122 KBUILD_MODNAME, false); 1123 1124 if (gen2vm) { 1125 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */ 1126 screen_info.lfb_size = 0; 1127 screen_info.lfb_base = 0; 1128 screen_info.orig_video_isVGA = 0; 1129 } else { 1130 pci_dev_put(pdev); 1131 } 1132 1133 return 0; 1134 1135 err3: 1136 iounmap(fb_virt); 1137 err2: 1138 vmbus_free_mmio(par->mem->start, screen_fb_size); 1139 par->mem = NULL; 1140 err1: 1141 if (!gen2vm) 1142 pci_dev_put(pdev); 1143 1144 return -ENOMEM; 1145 } 1146 1147 /* Release the framebuffer */ 1148 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info) 1149 { 1150 struct hvfb_par *par = info->par; 1151 1152 if (par->need_docopy) { 1153 vfree(par->dio_vp); 1154 iounmap(info->screen_base); 1155 vmbus_free_mmio(par->mem->start, screen_fb_size); 1156 } else { 1157 hvfb_release_phymem(hdev, info->fix.smem_start, 1158 screen_fb_size); 1159 } 1160 1161 par->mem = NULL; 1162 } 1163 1164 1165 static int hvfb_probe(struct hv_device *hdev, 1166 const struct hv_vmbus_device_id *dev_id) 1167 { 1168 struct fb_info *info; 1169 struct hvfb_par *par; 1170 int ret; 1171 1172 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1173 if (!info) 1174 return -ENOMEM; 1175 1176 par = info->par; 1177 par->info = info; 1178 par->fb_ready = false; 1179 par->need_docopy = true; 1180 init_completion(&par->wait); 1181 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1182 1183 par->delayed_refresh = false; 1184 spin_lock_init(&par->delayed_refresh_lock); 1185 par->x1 = par->y1 = INT_MAX; 1186 par->x2 = par->y2 = 0; 1187 1188 /* Connect to VSP */ 1189 hv_set_drvdata(hdev, info); 1190 ret = synthvid_connect_vsp(hdev); 1191 if (ret) { 1192 pr_err("Unable to connect to VSP\n"); 1193 goto error1; 1194 } 1195 1196 hvfb_get_option(info); 1197 pr_info("Screen resolution: %dx%d, Color depth: %d\n", 1198 screen_width, screen_height, screen_depth); 1199 1200 ret = hvfb_getmem(hdev, info); 1201 if (ret) { 1202 pr_err("No memory for framebuffer\n"); 1203 goto error2; 1204 } 1205 1206 /* Set up fb_info */ 1207 info->flags = FBINFO_DEFAULT; 1208 1209 info->var.xres_virtual = info->var.xres = screen_width; 1210 info->var.yres_virtual = info->var.yres = screen_height; 1211 info->var.bits_per_pixel = screen_depth; 1212 1213 if (info->var.bits_per_pixel == 16) { 1214 info->var.red = (struct fb_bitfield){11, 5, 0}; 1215 info->var.green = (struct fb_bitfield){5, 6, 0}; 1216 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1217 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1218 } else { 1219 info->var.red = (struct fb_bitfield){16, 8, 0}; 1220 info->var.green = (struct fb_bitfield){8, 8, 0}; 1221 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1222 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1223 } 1224 1225 info->var.activate = FB_ACTIVATE_NOW; 1226 info->var.height = -1; 1227 info->var.width = -1; 1228 info->var.vmode = FB_VMODE_NONINTERLACED; 1229 1230 strcpy(info->fix.id, KBUILD_MODNAME); 1231 info->fix.type = FB_TYPE_PACKED_PIXELS; 1232 info->fix.visual = FB_VISUAL_TRUECOLOR; 1233 info->fix.line_length = screen_width * screen_depth / 8; 1234 info->fix.accel = FB_ACCEL_NONE; 1235 1236 info->fbops = &hvfb_ops; 1237 info->pseudo_palette = par->pseudo_palette; 1238 1239 /* Initialize deferred IO */ 1240 info->fbdefio = &synthvid_defio; 1241 fb_deferred_io_init(info); 1242 1243 /* Send config to host */ 1244 ret = synthvid_send_config(hdev); 1245 if (ret) 1246 goto error; 1247 1248 ret = register_framebuffer(info); 1249 if (ret) { 1250 pr_err("Unable to register framebuffer\n"); 1251 goto error; 1252 } 1253 1254 par->fb_ready = true; 1255 1256 par->synchronous_fb = false; 1257 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1258 atomic_notifier_chain_register(&panic_notifier_list, 1259 &par->hvfb_panic_nb); 1260 1261 return 0; 1262 1263 error: 1264 fb_deferred_io_cleanup(info); 1265 hvfb_putmem(hdev, info); 1266 error2: 1267 vmbus_close(hdev->channel); 1268 error1: 1269 cancel_delayed_work_sync(&par->dwork); 1270 hv_set_drvdata(hdev, NULL); 1271 framebuffer_release(info); 1272 return ret; 1273 } 1274 1275 1276 static int hvfb_remove(struct hv_device *hdev) 1277 { 1278 struct fb_info *info = hv_get_drvdata(hdev); 1279 struct hvfb_par *par = info->par; 1280 1281 atomic_notifier_chain_unregister(&panic_notifier_list, 1282 &par->hvfb_panic_nb); 1283 1284 par->update = false; 1285 par->fb_ready = false; 1286 1287 fb_deferred_io_cleanup(info); 1288 1289 unregister_framebuffer(info); 1290 cancel_delayed_work_sync(&par->dwork); 1291 1292 vmbus_close(hdev->channel); 1293 hv_set_drvdata(hdev, NULL); 1294 1295 hvfb_putmem(hdev, info); 1296 framebuffer_release(info); 1297 1298 return 0; 1299 } 1300 1301 static int hvfb_suspend(struct hv_device *hdev) 1302 { 1303 struct fb_info *info = hv_get_drvdata(hdev); 1304 struct hvfb_par *par = info->par; 1305 1306 console_lock(); 1307 1308 /* 1 means do suspend */ 1309 fb_set_suspend(info, 1); 1310 1311 cancel_delayed_work_sync(&par->dwork); 1312 cancel_delayed_work_sync(&info->deferred_work); 1313 1314 par->update_saved = par->update; 1315 par->update = false; 1316 par->fb_ready = false; 1317 1318 vmbus_close(hdev->channel); 1319 1320 console_unlock(); 1321 1322 return 0; 1323 } 1324 1325 static int hvfb_resume(struct hv_device *hdev) 1326 { 1327 struct fb_info *info = hv_get_drvdata(hdev); 1328 struct hvfb_par *par = info->par; 1329 int ret; 1330 1331 console_lock(); 1332 1333 ret = synthvid_connect_vsp(hdev); 1334 if (ret != 0) 1335 goto out; 1336 1337 ret = synthvid_send_config(hdev); 1338 if (ret != 0) { 1339 vmbus_close(hdev->channel); 1340 goto out; 1341 } 1342 1343 par->fb_ready = true; 1344 par->update = par->update_saved; 1345 1346 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1347 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1348 1349 /* 0 means do resume */ 1350 fb_set_suspend(info, 0); 1351 1352 out: 1353 console_unlock(); 1354 1355 return ret; 1356 } 1357 1358 1359 static const struct pci_device_id pci_stub_id_table[] = { 1360 { 1361 .vendor = PCI_VENDOR_ID_MICROSOFT, 1362 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1363 }, 1364 { /* end of list */ } 1365 }; 1366 1367 static const struct hv_vmbus_device_id id_table[] = { 1368 /* Synthetic Video Device GUID */ 1369 {HV_SYNTHVID_GUID}, 1370 {} 1371 }; 1372 1373 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1374 MODULE_DEVICE_TABLE(vmbus, id_table); 1375 1376 static struct hv_driver hvfb_drv = { 1377 .name = KBUILD_MODNAME, 1378 .id_table = id_table, 1379 .probe = hvfb_probe, 1380 .remove = hvfb_remove, 1381 .suspend = hvfb_suspend, 1382 .resume = hvfb_resume, 1383 .driver = { 1384 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1385 }, 1386 }; 1387 1388 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1389 const struct pci_device_id *ent) 1390 { 1391 return 0; 1392 } 1393 1394 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1395 { 1396 } 1397 1398 static struct pci_driver hvfb_pci_stub_driver = { 1399 .name = KBUILD_MODNAME, 1400 .id_table = pci_stub_id_table, 1401 .probe = hvfb_pci_stub_probe, 1402 .remove = hvfb_pci_stub_remove, 1403 .driver = { 1404 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1405 } 1406 }; 1407 1408 static int __init hvfb_drv_init(void) 1409 { 1410 int ret; 1411 1412 ret = vmbus_driver_register(&hvfb_drv); 1413 if (ret != 0) 1414 return ret; 1415 1416 ret = pci_register_driver(&hvfb_pci_stub_driver); 1417 if (ret != 0) { 1418 vmbus_driver_unregister(&hvfb_drv); 1419 return ret; 1420 } 1421 1422 return 0; 1423 } 1424 1425 static void __exit hvfb_drv_exit(void) 1426 { 1427 pci_unregister_driver(&hvfb_pci_stub_driver); 1428 vmbus_driver_unregister(&hvfb_drv); 1429 } 1430 1431 module_init(hvfb_drv_init); 1432 module_exit(hvfb_drv_exit); 1433 1434 MODULE_LICENSE("GPL"); 1435 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1436