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_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_ratelimited("Unable to send packet via vmbus; error %d\n", ret); 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; 583 584 memset(msg, 0, sizeof(struct synthvid_msg)); 585 msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST; 586 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 587 sizeof(struct synthvid_supported_resolution_req); 588 589 msg->resolution_req.maximum_resolution_count = 590 SYNTHVID_MAX_RESOLUTION_COUNT; 591 synthvid_send(hdev, msg); 592 593 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 594 if (!t) { 595 pr_err("Time out on waiting resolution response\n"); 596 ret = -ETIMEDOUT; 597 goto out; 598 } 599 600 if (msg->resolution_resp.resolution_count == 0) { 601 pr_err("No supported resolutions\n"); 602 ret = -ENODEV; 603 goto out; 604 } 605 606 index = msg->resolution_resp.default_resolution_index; 607 if (index >= msg->resolution_resp.resolution_count) { 608 pr_err("Invalid resolution index: %d\n", index); 609 ret = -ENODEV; 610 goto out; 611 } 612 613 screen_width = 614 msg->resolution_resp.supported_resolution[index].width; 615 screen_height = 616 msg->resolution_resp.supported_resolution[index].height; 617 618 out: 619 return ret; 620 } 621 622 /* Connect to VSP (Virtual Service Provider) on host */ 623 static int synthvid_connect_vsp(struct hv_device *hdev) 624 { 625 struct fb_info *info = hv_get_drvdata(hdev); 626 struct hvfb_par *par = info->par; 627 int ret; 628 629 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, 630 NULL, 0, synthvid_receive, hdev); 631 if (ret) { 632 pr_err("Unable to open vmbus channel\n"); 633 return ret; 634 } 635 636 /* Negotiate the protocol version with host */ 637 switch (vmbus_proto_version) { 638 case VERSION_WIN10: 639 case VERSION_WIN10_V5: 640 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 641 if (!ret) 642 break; 643 fallthrough; 644 case VERSION_WIN8: 645 case VERSION_WIN8_1: 646 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); 647 if (!ret) 648 break; 649 fallthrough; 650 case VERSION_WS2008: 651 case VERSION_WIN7: 652 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); 653 break; 654 default: 655 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10); 656 break; 657 } 658 659 if (ret) { 660 pr_err("Synthetic video device version not accepted\n"); 661 goto error; 662 } 663 664 if (par->synthvid_version == SYNTHVID_VERSION_WIN7) 665 screen_depth = SYNTHVID_DEPTH_WIN7; 666 else 667 screen_depth = SYNTHVID_DEPTH_WIN8; 668 669 if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) { 670 ret = synthvid_get_supported_resolution(hdev); 671 if (ret) 672 pr_info("Failed to get supported resolution from host, use default\n"); 673 } 674 675 screen_fb_size = hdev->channel->offermsg.offer. 676 mmio_megabytes * 1024 * 1024; 677 678 return 0; 679 680 error: 681 vmbus_close(hdev->channel); 682 return ret; 683 } 684 685 /* Send VRAM and Situation messages to the host */ 686 static int synthvid_send_config(struct hv_device *hdev) 687 { 688 struct fb_info *info = hv_get_drvdata(hdev); 689 struct hvfb_par *par = info->par; 690 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; 691 int ret = 0; 692 unsigned long t; 693 694 /* Send VRAM location */ 695 memset(msg, 0, sizeof(struct synthvid_msg)); 696 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; 697 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + 698 sizeof(struct synthvid_vram_location); 699 msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp; 700 msg->vram.is_vram_gpa_specified = 1; 701 synthvid_send(hdev, msg); 702 703 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); 704 if (!t) { 705 pr_err("Time out on waiting vram location ack\n"); 706 ret = -ETIMEDOUT; 707 goto out; 708 } 709 if (msg->vram_ack.user_ctx != par->mmio_pp) { 710 pr_err("Unable to set VRAM location\n"); 711 ret = -ENODEV; 712 goto out; 713 } 714 715 /* Send pointer and situation update */ 716 synthvid_send_ptr(hdev); 717 synthvid_send_situ(hdev); 718 719 out: 720 return ret; 721 } 722 723 724 /* 725 * Delayed work callback: 726 * It is scheduled to call whenever update request is received and it has 727 * not been called in last HVFB_ONDEMAND_THROTTLE time interval. 728 */ 729 static void hvfb_update_work(struct work_struct *w) 730 { 731 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); 732 struct fb_info *info = par->info; 733 unsigned long flags; 734 int x1, x2, y1, y2; 735 int j; 736 737 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 738 /* Reset the request flag */ 739 par->delayed_refresh = false; 740 741 /* Store the dirty rectangle to local variables */ 742 x1 = par->x1; 743 x2 = par->x2; 744 y1 = par->y1; 745 y2 = par->y2; 746 747 /* Clear dirty rectangle */ 748 par->x1 = par->y1 = INT_MAX; 749 par->x2 = par->y2 = 0; 750 751 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 752 753 if (x1 > info->var.xres || x2 > info->var.xres || 754 y1 > info->var.yres || y2 > info->var.yres || x2 <= x1) 755 return; 756 757 /* Copy the dirty rectangle to frame buffer memory */ 758 if (par->need_docopy) 759 for (j = y1; j < y2; j++) 760 hvfb_docopy(par, 761 j * info->fix.line_length + 762 (x1 * screen_depth / 8), 763 (x2 - x1) * screen_depth / 8); 764 765 /* Refresh */ 766 if (par->fb_ready && par->update) 767 synthvid_update(info, x1, y1, x2, y2); 768 } 769 770 /* 771 * Control the on-demand refresh frequency. It schedules a delayed 772 * screen update if it has not yet. 773 */ 774 static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par, 775 int x1, int y1, int w, int h) 776 { 777 unsigned long flags; 778 int x2 = x1 + w; 779 int y2 = y1 + h; 780 781 spin_lock_irqsave(&par->delayed_refresh_lock, flags); 782 783 /* Merge dirty rectangle */ 784 par->x1 = min_t(int, par->x1, x1); 785 par->y1 = min_t(int, par->y1, y1); 786 par->x2 = max_t(int, par->x2, x2); 787 par->y2 = max_t(int, par->y2, y2); 788 789 /* Schedule a delayed screen update if not yet */ 790 if (par->delayed_refresh == false) { 791 schedule_delayed_work(&par->dwork, 792 HVFB_ONDEMAND_THROTTLE); 793 par->delayed_refresh = true; 794 } 795 796 spin_unlock_irqrestore(&par->delayed_refresh_lock, flags); 797 } 798 799 static int hvfb_on_panic(struct notifier_block *nb, 800 unsigned long e, void *p) 801 { 802 struct hvfb_par *par; 803 struct fb_info *info; 804 805 par = container_of(nb, struct hvfb_par, hvfb_panic_nb); 806 par->synchronous_fb = true; 807 info = par->info; 808 if (par->need_docopy) 809 hvfb_docopy(par, 0, dio_fb_size); 810 synthvid_update(info, 0, 0, INT_MAX, INT_MAX); 811 812 return NOTIFY_DONE; 813 } 814 815 /* Framebuffer operation handlers */ 816 817 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 818 { 819 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || 820 var->xres > screen_width || var->yres > screen_height || 821 var->bits_per_pixel != screen_depth) 822 return -EINVAL; 823 824 var->xres_virtual = var->xres; 825 var->yres_virtual = var->yres; 826 827 return 0; 828 } 829 830 static int hvfb_set_par(struct fb_info *info) 831 { 832 struct hv_device *hdev = device_to_hv_device(info->device); 833 834 return synthvid_send_situ(hdev); 835 } 836 837 838 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) 839 { 840 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 841 } 842 843 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, 844 unsigned blue, unsigned transp, struct fb_info *info) 845 { 846 u32 *pal = info->pseudo_palette; 847 848 if (regno > 15) 849 return -EINVAL; 850 851 pal[regno] = chan_to_field(red, &info->var.red) 852 | chan_to_field(green, &info->var.green) 853 | chan_to_field(blue, &info->var.blue) 854 | chan_to_field(transp, &info->var.transp); 855 856 return 0; 857 } 858 859 static int hvfb_blank(int blank, struct fb_info *info) 860 { 861 return 1; /* get fb_blank to set the colormap to all black */ 862 } 863 864 static void hvfb_cfb_fillrect(struct fb_info *p, 865 const struct fb_fillrect *rect) 866 { 867 struct hvfb_par *par = p->par; 868 869 cfb_fillrect(p, rect); 870 if (par->synchronous_fb) 871 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 872 else 873 hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy, 874 rect->width, rect->height); 875 } 876 877 static void hvfb_cfb_copyarea(struct fb_info *p, 878 const struct fb_copyarea *area) 879 { 880 struct hvfb_par *par = p->par; 881 882 cfb_copyarea(p, area); 883 if (par->synchronous_fb) 884 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 885 else 886 hvfb_ondemand_refresh_throttle(par, area->dx, area->dy, 887 area->width, area->height); 888 } 889 890 static void hvfb_cfb_imageblit(struct fb_info *p, 891 const struct fb_image *image) 892 { 893 struct hvfb_par *par = p->par; 894 895 cfb_imageblit(p, image); 896 if (par->synchronous_fb) 897 synthvid_update(p, 0, 0, INT_MAX, INT_MAX); 898 else 899 hvfb_ondemand_refresh_throttle(par, image->dx, image->dy, 900 image->width, image->height); 901 } 902 903 static const struct fb_ops hvfb_ops = { 904 .owner = THIS_MODULE, 905 .fb_check_var = hvfb_check_var, 906 .fb_set_par = hvfb_set_par, 907 .fb_setcolreg = hvfb_setcolreg, 908 .fb_fillrect = hvfb_cfb_fillrect, 909 .fb_copyarea = hvfb_cfb_copyarea, 910 .fb_imageblit = hvfb_cfb_imageblit, 911 .fb_blank = hvfb_blank, 912 }; 913 914 915 /* Get options from kernel paramenter "video=" */ 916 static void hvfb_get_option(struct fb_info *info) 917 { 918 struct hvfb_par *par = info->par; 919 char *opt = NULL, *p; 920 uint x = 0, y = 0; 921 922 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) 923 return; 924 925 p = strsep(&opt, "x"); 926 if (!*p || kstrtouint(p, 0, &x) || 927 !opt || !*opt || kstrtouint(opt, 0, &y)) { 928 pr_err("Screen option is invalid: skipped\n"); 929 return; 930 } 931 932 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || 933 (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) && 934 (x * y * screen_depth / 8 > screen_fb_size)) || 935 (par->synthvid_version == SYNTHVID_VERSION_WIN8 && 936 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || 937 (par->synthvid_version == SYNTHVID_VERSION_WIN7 && 938 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { 939 pr_err("Screen resolution option is out of range: skipped\n"); 940 return; 941 } 942 943 screen_width = x; 944 screen_height = y; 945 return; 946 } 947 948 /* 949 * Allocate enough contiguous physical memory. 950 * Return physical address if succeeded or -1 if failed. 951 */ 952 static phys_addr_t hvfb_get_phymem(struct hv_device *hdev, 953 unsigned int request_size) 954 { 955 struct page *page = NULL; 956 dma_addr_t dma_handle; 957 void *vmem; 958 phys_addr_t paddr = 0; 959 unsigned int order = get_order(request_size); 960 961 if (request_size == 0) 962 return -1; 963 964 if (order < MAX_ORDER) { 965 /* Call alloc_pages if the size is less than 2^MAX_ORDER */ 966 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 967 if (!page) 968 return -1; 969 970 paddr = (page_to_pfn(page) << PAGE_SHIFT); 971 } else { 972 /* Allocate from CMA */ 973 hdev->device.coherent_dma_mask = DMA_BIT_MASK(64); 974 975 vmem = dma_alloc_coherent(&hdev->device, 976 round_up(request_size, PAGE_SIZE), 977 &dma_handle, 978 GFP_KERNEL | __GFP_NOWARN); 979 980 if (!vmem) 981 return -1; 982 983 paddr = virt_to_phys(vmem); 984 } 985 986 return paddr; 987 } 988 989 /* Release contiguous physical memory */ 990 static void hvfb_release_phymem(struct hv_device *hdev, 991 phys_addr_t paddr, unsigned int size) 992 { 993 unsigned int order = get_order(size); 994 995 if (order < MAX_ORDER) 996 __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order); 997 else 998 dma_free_coherent(&hdev->device, 999 round_up(size, PAGE_SIZE), 1000 phys_to_virt(paddr), 1001 paddr); 1002 } 1003 1004 1005 /* Get framebuffer memory from Hyper-V video pci space */ 1006 static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info) 1007 { 1008 struct hvfb_par *par = info->par; 1009 struct pci_dev *pdev = NULL; 1010 void __iomem *fb_virt; 1011 int gen2vm = efi_enabled(EFI_BOOT); 1012 resource_size_t pot_start, pot_end; 1013 phys_addr_t paddr; 1014 int ret; 1015 1016 info->apertures = alloc_apertures(1); 1017 if (!info->apertures) 1018 return -ENOMEM; 1019 1020 if (!gen2vm) { 1021 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, 1022 PCI_DEVICE_ID_HYPERV_VIDEO, NULL); 1023 if (!pdev) { 1024 pr_err("Unable to find PCI Hyper-V video\n"); 1025 return -ENODEV; 1026 } 1027 1028 info->apertures->ranges[0].base = pci_resource_start(pdev, 0); 1029 info->apertures->ranges[0].size = pci_resource_len(pdev, 0); 1030 1031 /* 1032 * For Gen 1 VM, we can directly use the contiguous memory 1033 * from VM. If we succeed, deferred IO happens directly 1034 * on this allocated framebuffer memory, avoiding extra 1035 * memory copy. 1036 */ 1037 paddr = hvfb_get_phymem(hdev, screen_fb_size); 1038 if (paddr != (phys_addr_t) -1) { 1039 par->mmio_pp = paddr; 1040 par->mmio_vp = par->dio_vp = __va(paddr); 1041 1042 info->fix.smem_start = paddr; 1043 info->fix.smem_len = screen_fb_size; 1044 info->screen_base = par->mmio_vp; 1045 info->screen_size = screen_fb_size; 1046 1047 par->need_docopy = false; 1048 goto getmem_done; 1049 } 1050 pr_info("Unable to allocate enough contiguous physical memory on Gen 1 VM. Using MMIO instead.\n"); 1051 } else { 1052 info->apertures->ranges[0].base = screen_info.lfb_base; 1053 info->apertures->ranges[0].size = screen_info.lfb_size; 1054 } 1055 1056 /* 1057 * Cannot use the contiguous physical memory. 1058 * Allocate mmio space for framebuffer. 1059 */ 1060 dio_fb_size = 1061 screen_width * screen_height * screen_depth / 8; 1062 1063 if (gen2vm) { 1064 pot_start = 0; 1065 pot_end = -1; 1066 } else { 1067 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) || 1068 pci_resource_len(pdev, 0) < screen_fb_size) { 1069 pr_err("Resource not available or (0x%lx < 0x%lx)\n", 1070 (unsigned long) pci_resource_len(pdev, 0), 1071 (unsigned long) screen_fb_size); 1072 goto err1; 1073 } 1074 1075 pot_end = pci_resource_end(pdev, 0); 1076 pot_start = pot_end - screen_fb_size + 1; 1077 } 1078 1079 ret = vmbus_allocate_mmio(&par->mem, hdev, pot_start, pot_end, 1080 screen_fb_size, 0x100000, true); 1081 if (ret != 0) { 1082 pr_err("Unable to allocate framebuffer memory\n"); 1083 goto err1; 1084 } 1085 1086 /* 1087 * Map the VRAM cacheable for performance. This is also required for 1088 * VM Connect to display properly for ARM64 Linux VM, as the host also 1089 * maps the VRAM cacheable. 1090 */ 1091 fb_virt = ioremap_cache(par->mem->start, screen_fb_size); 1092 if (!fb_virt) 1093 goto err2; 1094 1095 /* Allocate memory for deferred IO */ 1096 par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE)); 1097 if (par->dio_vp == NULL) 1098 goto err3; 1099 1100 /* Physical address of FB device */ 1101 par->mmio_pp = par->mem->start; 1102 /* Virtual address of FB device */ 1103 par->mmio_vp = (unsigned char *) fb_virt; 1104 1105 info->fix.smem_start = par->mem->start; 1106 info->fix.smem_len = dio_fb_size; 1107 info->screen_base = par->dio_vp; 1108 info->screen_size = dio_fb_size; 1109 1110 getmem_done: 1111 remove_conflicting_framebuffers(info->apertures, 1112 KBUILD_MODNAME, false); 1113 1114 if (gen2vm) { 1115 /* framebuffer is reallocated, clear screen_info to avoid misuse from kexec */ 1116 screen_info.lfb_size = 0; 1117 screen_info.lfb_base = 0; 1118 screen_info.orig_video_isVGA = 0; 1119 } else { 1120 pci_dev_put(pdev); 1121 } 1122 1123 return 0; 1124 1125 err3: 1126 iounmap(fb_virt); 1127 err2: 1128 vmbus_free_mmio(par->mem->start, screen_fb_size); 1129 par->mem = NULL; 1130 err1: 1131 if (!gen2vm) 1132 pci_dev_put(pdev); 1133 1134 return -ENOMEM; 1135 } 1136 1137 /* Release the framebuffer */ 1138 static void hvfb_putmem(struct hv_device *hdev, struct fb_info *info) 1139 { 1140 struct hvfb_par *par = info->par; 1141 1142 if (par->need_docopy) { 1143 vfree(par->dio_vp); 1144 iounmap(info->screen_base); 1145 vmbus_free_mmio(par->mem->start, screen_fb_size); 1146 } else { 1147 hvfb_release_phymem(hdev, info->fix.smem_start, 1148 screen_fb_size); 1149 } 1150 1151 par->mem = NULL; 1152 } 1153 1154 1155 static int hvfb_probe(struct hv_device *hdev, 1156 const struct hv_vmbus_device_id *dev_id) 1157 { 1158 struct fb_info *info; 1159 struct hvfb_par *par; 1160 int ret; 1161 1162 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); 1163 if (!info) 1164 return -ENOMEM; 1165 1166 par = info->par; 1167 par->info = info; 1168 par->fb_ready = false; 1169 par->need_docopy = true; 1170 init_completion(&par->wait); 1171 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); 1172 1173 par->delayed_refresh = false; 1174 spin_lock_init(&par->delayed_refresh_lock); 1175 par->x1 = par->y1 = INT_MAX; 1176 par->x2 = par->y2 = 0; 1177 1178 /* Connect to VSP */ 1179 hv_set_drvdata(hdev, info); 1180 ret = synthvid_connect_vsp(hdev); 1181 if (ret) { 1182 pr_err("Unable to connect to VSP\n"); 1183 goto error1; 1184 } 1185 1186 hvfb_get_option(info); 1187 pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size: %d\n", 1188 screen_width, screen_height, screen_depth, screen_fb_size); 1189 1190 ret = hvfb_getmem(hdev, info); 1191 if (ret) { 1192 pr_err("No memory for framebuffer\n"); 1193 goto error2; 1194 } 1195 1196 /* Set up fb_info */ 1197 info->flags = FBINFO_DEFAULT; 1198 1199 info->var.xres_virtual = info->var.xres = screen_width; 1200 info->var.yres_virtual = info->var.yres = screen_height; 1201 info->var.bits_per_pixel = screen_depth; 1202 1203 if (info->var.bits_per_pixel == 16) { 1204 info->var.red = (struct fb_bitfield){11, 5, 0}; 1205 info->var.green = (struct fb_bitfield){5, 6, 0}; 1206 info->var.blue = (struct fb_bitfield){0, 5, 0}; 1207 info->var.transp = (struct fb_bitfield){0, 0, 0}; 1208 } else { 1209 info->var.red = (struct fb_bitfield){16, 8, 0}; 1210 info->var.green = (struct fb_bitfield){8, 8, 0}; 1211 info->var.blue = (struct fb_bitfield){0, 8, 0}; 1212 info->var.transp = (struct fb_bitfield){24, 8, 0}; 1213 } 1214 1215 info->var.activate = FB_ACTIVATE_NOW; 1216 info->var.height = -1; 1217 info->var.width = -1; 1218 info->var.vmode = FB_VMODE_NONINTERLACED; 1219 1220 strcpy(info->fix.id, KBUILD_MODNAME); 1221 info->fix.type = FB_TYPE_PACKED_PIXELS; 1222 info->fix.visual = FB_VISUAL_TRUECOLOR; 1223 info->fix.line_length = screen_width * screen_depth / 8; 1224 info->fix.accel = FB_ACCEL_NONE; 1225 1226 info->fbops = &hvfb_ops; 1227 info->pseudo_palette = par->pseudo_palette; 1228 1229 /* Initialize deferred IO */ 1230 info->fbdefio = &synthvid_defio; 1231 fb_deferred_io_init(info); 1232 1233 /* Send config to host */ 1234 ret = synthvid_send_config(hdev); 1235 if (ret) 1236 goto error; 1237 1238 ret = register_framebuffer(info); 1239 if (ret) { 1240 pr_err("Unable to register framebuffer\n"); 1241 goto error; 1242 } 1243 1244 par->fb_ready = true; 1245 1246 par->synchronous_fb = false; 1247 par->hvfb_panic_nb.notifier_call = hvfb_on_panic; 1248 atomic_notifier_chain_register(&panic_notifier_list, 1249 &par->hvfb_panic_nb); 1250 1251 return 0; 1252 1253 error: 1254 fb_deferred_io_cleanup(info); 1255 hvfb_putmem(hdev, info); 1256 error2: 1257 vmbus_close(hdev->channel); 1258 error1: 1259 cancel_delayed_work_sync(&par->dwork); 1260 hv_set_drvdata(hdev, NULL); 1261 framebuffer_release(info); 1262 return ret; 1263 } 1264 1265 1266 static int hvfb_remove(struct hv_device *hdev) 1267 { 1268 struct fb_info *info = hv_get_drvdata(hdev); 1269 struct hvfb_par *par = info->par; 1270 1271 atomic_notifier_chain_unregister(&panic_notifier_list, 1272 &par->hvfb_panic_nb); 1273 1274 par->update = false; 1275 par->fb_ready = false; 1276 1277 fb_deferred_io_cleanup(info); 1278 1279 unregister_framebuffer(info); 1280 cancel_delayed_work_sync(&par->dwork); 1281 1282 vmbus_close(hdev->channel); 1283 hv_set_drvdata(hdev, NULL); 1284 1285 hvfb_putmem(hdev, info); 1286 framebuffer_release(info); 1287 1288 return 0; 1289 } 1290 1291 static int hvfb_suspend(struct hv_device *hdev) 1292 { 1293 struct fb_info *info = hv_get_drvdata(hdev); 1294 struct hvfb_par *par = info->par; 1295 1296 console_lock(); 1297 1298 /* 1 means do suspend */ 1299 fb_set_suspend(info, 1); 1300 1301 cancel_delayed_work_sync(&par->dwork); 1302 cancel_delayed_work_sync(&info->deferred_work); 1303 1304 par->update_saved = par->update; 1305 par->update = false; 1306 par->fb_ready = false; 1307 1308 vmbus_close(hdev->channel); 1309 1310 console_unlock(); 1311 1312 return 0; 1313 } 1314 1315 static int hvfb_resume(struct hv_device *hdev) 1316 { 1317 struct fb_info *info = hv_get_drvdata(hdev); 1318 struct hvfb_par *par = info->par; 1319 int ret; 1320 1321 console_lock(); 1322 1323 ret = synthvid_connect_vsp(hdev); 1324 if (ret != 0) 1325 goto out; 1326 1327 ret = synthvid_send_config(hdev); 1328 if (ret != 0) { 1329 vmbus_close(hdev->channel); 1330 goto out; 1331 } 1332 1333 par->fb_ready = true; 1334 par->update = par->update_saved; 1335 1336 schedule_delayed_work(&info->deferred_work, info->fbdefio->delay); 1337 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); 1338 1339 /* 0 means do resume */ 1340 fb_set_suspend(info, 0); 1341 1342 out: 1343 console_unlock(); 1344 1345 return ret; 1346 } 1347 1348 1349 static const struct pci_device_id pci_stub_id_table[] = { 1350 { 1351 .vendor = PCI_VENDOR_ID_MICROSOFT, 1352 .device = PCI_DEVICE_ID_HYPERV_VIDEO, 1353 }, 1354 { /* end of list */ } 1355 }; 1356 1357 static const struct hv_vmbus_device_id id_table[] = { 1358 /* Synthetic Video Device GUID */ 1359 {HV_SYNTHVID_GUID}, 1360 {} 1361 }; 1362 1363 MODULE_DEVICE_TABLE(pci, pci_stub_id_table); 1364 MODULE_DEVICE_TABLE(vmbus, id_table); 1365 1366 static struct hv_driver hvfb_drv = { 1367 .name = KBUILD_MODNAME, 1368 .id_table = id_table, 1369 .probe = hvfb_probe, 1370 .remove = hvfb_remove, 1371 .suspend = hvfb_suspend, 1372 .resume = hvfb_resume, 1373 .driver = { 1374 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1375 }, 1376 }; 1377 1378 static int hvfb_pci_stub_probe(struct pci_dev *pdev, 1379 const struct pci_device_id *ent) 1380 { 1381 return 0; 1382 } 1383 1384 static void hvfb_pci_stub_remove(struct pci_dev *pdev) 1385 { 1386 } 1387 1388 static struct pci_driver hvfb_pci_stub_driver = { 1389 .name = KBUILD_MODNAME, 1390 .id_table = pci_stub_id_table, 1391 .probe = hvfb_pci_stub_probe, 1392 .remove = hvfb_pci_stub_remove, 1393 .driver = { 1394 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1395 } 1396 }; 1397 1398 static int __init hvfb_drv_init(void) 1399 { 1400 int ret; 1401 1402 ret = vmbus_driver_register(&hvfb_drv); 1403 if (ret != 0) 1404 return ret; 1405 1406 ret = pci_register_driver(&hvfb_pci_stub_driver); 1407 if (ret != 0) { 1408 vmbus_driver_unregister(&hvfb_drv); 1409 return ret; 1410 } 1411 1412 return 0; 1413 } 1414 1415 static void __exit hvfb_drv_exit(void) 1416 { 1417 pci_unregister_driver(&hvfb_pci_stub_driver); 1418 vmbus_driver_unregister(&hvfb_drv); 1419 } 1420 1421 module_init(hvfb_drv_init); 1422 module_exit(hvfb_drv_exit); 1423 1424 MODULE_LICENSE("GPL"); 1425 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); 1426