2 * Copyright (c) 2012, Microsoft Corporation.
5 * Haiyang Zhang <haiyangz@microsoft.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
19 * Hyper-V Synthetic Video Frame Buffer Driver
21 * This is the driver for the Hyper-V Synthetic Video, which supports
22 * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows
23 * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2
26 * It also solves the double mouse cursor issue of the emulated video mode.
28 * The default screen resolution is 1152x864, which may be changed by a
30 * video=hyperv_fb:<width>x<height>
31 * For example: video=hyperv_fb:1280x1024
33 * Portrait orientation is also supported:
34 * For example: video=hyperv_fb:864x1152
37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
39 #include <linux/module.h>
40 #include <linux/kernel.h>
41 #include <linux/init.h>
42 #include <linux/completion.h>
44 #include <linux/pci.h>
45 #include <linux/efi.h>
47 #include <linux/hyperv.h>
50 /* Hyper-V Synthetic Video Protocol definitions and structures */
51 #define MAX_VMBUS_PKT_SIZE 0x4000
53 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))
54 #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
55 #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
57 #define SYNTHVID_DEPTH_WIN7 16
58 #define SYNTHVID_DEPTH_WIN8 32
60 #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024)
61 #define SYNTHVID_WIDTH_MAX_WIN7 1600
62 #define SYNTHVID_HEIGHT_MAX_WIN7 1200
64 #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
66 #define PCI_VENDOR_ID_MICROSOFT 0x1414
67 #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353
78 u32 size; /* size of message after this field */
82 enum synthvid_msg_type {
84 SYNTHVID_VERSION_REQUEST = 1,
85 SYNTHVID_VERSION_RESPONSE = 2,
86 SYNTHVID_VRAM_LOCATION = 3,
87 SYNTHVID_VRAM_LOCATION_ACK = 4,
88 SYNTHVID_SITUATION_UPDATE = 5,
89 SYNTHVID_SITUATION_UPDATE_ACK = 6,
90 SYNTHVID_POINTER_POSITION = 7,
91 SYNTHVID_POINTER_SHAPE = 8,
92 SYNTHVID_FEATURE_CHANGE = 9,
98 struct synthvid_msg_hdr {
100 u32 size; /* size of this header + payload after this field*/
104 struct synthvid_version_req {
108 struct synthvid_version_resp {
111 u8 max_video_outputs;
114 struct synthvid_vram_location {
116 u8 is_vram_gpa_specified;
120 struct synthvid_vram_location_ack {
124 struct video_output_situation {
133 struct synthvid_situation_update {
135 u8 video_output_count;
136 struct video_output_situation video_output[1];
139 struct synthvid_situation_update_ack {
143 struct synthvid_pointer_position {
151 #define CURSOR_MAX_X 96
152 #define CURSOR_MAX_Y 96
153 #define CURSOR_ARGB_PIXEL_SIZE 4
154 #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE)
155 #define CURSOR_COMPLETE (-1)
157 struct synthvid_pointer_shape {
160 u32 width; /* CURSOR_MAX_X at most */
161 u32 height; /* CURSOR_MAX_Y at most */
162 u32 hot_x; /* hotspot relative to upper-left of pointer image */
167 struct synthvid_feature_change {
169 u8 is_ptr_pos_needed;
170 u8 is_ptr_shape_needed;
175 s32 x1, y1; /* top left corner */
176 s32 x2, y2; /* bottom right corner, exclusive */
179 struct synthvid_dirt {
185 struct synthvid_msg {
186 struct pipe_msg_hdr pipe_hdr;
187 struct synthvid_msg_hdr vid_hdr;
189 struct synthvid_version_req ver_req;
190 struct synthvid_version_resp ver_resp;
191 struct synthvid_vram_location vram;
192 struct synthvid_vram_location_ack vram_ack;
193 struct synthvid_situation_update situ;
194 struct synthvid_situation_update_ack situ_ack;
195 struct synthvid_pointer_position ptr_pos;
196 struct synthvid_pointer_shape ptr_shape;
197 struct synthvid_feature_change feature_chg;
198 struct synthvid_dirt dirt;
204 /* FB driver definitions and structures */
205 #define HVFB_WIDTH 1152 /* default screen width */
206 #define HVFB_HEIGHT 864 /* default screen height */
207 #define HVFB_WIDTH_MIN 640
208 #define HVFB_HEIGHT_MIN 480
210 #define RING_BUFSIZE (256 * 1024)
211 #define VSP_TIMEOUT (10 * HZ)
212 #define HVFB_UPDATE_DELAY (HZ / 20)
215 struct fb_info *info;
217 bool fb_ready; /* fb device is ready */
218 struct completion wait;
219 u32 synthvid_version;
221 struct delayed_work dwork;
224 u32 pseudo_palette[16];
225 u8 init_buf[MAX_VMBUS_PKT_SIZE];
226 u8 recv_buf[MAX_VMBUS_PKT_SIZE];
229 static uint screen_width = HVFB_WIDTH;
230 static uint screen_height = HVFB_HEIGHT;
231 static uint screen_depth;
232 static uint screen_fb_size;
234 /* Send message to Hyper-V host */
235 static inline int synthvid_send(struct hv_device *hdev,
236 struct synthvid_msg *msg)
238 static atomic64_t request_id = ATOMIC64_INIT(0);
241 msg->pipe_hdr.type = PIPE_MSG_DATA;
242 msg->pipe_hdr.size = msg->vid_hdr.size;
244 ret = vmbus_sendpacket(hdev->channel, msg,
245 msg->vid_hdr.size + sizeof(struct pipe_msg_hdr),
246 atomic64_inc_return(&request_id),
247 VM_PKT_DATA_INBAND, 0);
250 pr_err("Unable to send packet via vmbus\n");
256 /* Send screen resolution info to host */
257 static int synthvid_send_situ(struct hv_device *hdev)
259 struct fb_info *info = hv_get_drvdata(hdev);
260 struct synthvid_msg msg;
265 memset(&msg, 0, sizeof(struct synthvid_msg));
267 msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE;
268 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
269 sizeof(struct synthvid_situation_update);
270 msg.situ.user_ctx = 0;
271 msg.situ.video_output_count = 1;
272 msg.situ.video_output[0].active = 1;
273 msg.situ.video_output[0].vram_offset = 0;
274 msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel;
275 msg.situ.video_output[0].width_pixels = info->var.xres;
276 msg.situ.video_output[0].height_pixels = info->var.yres;
277 msg.situ.video_output[0].pitch_bytes = info->fix.line_length;
279 synthvid_send(hdev, &msg);
284 /* Send mouse pointer info to host */
285 static int synthvid_send_ptr(struct hv_device *hdev)
287 struct synthvid_msg msg;
289 memset(&msg, 0, sizeof(struct synthvid_msg));
290 msg.vid_hdr.type = SYNTHVID_POINTER_POSITION;
291 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
292 sizeof(struct synthvid_pointer_position);
293 msg.ptr_pos.is_visible = 1;
294 msg.ptr_pos.video_output = 0;
295 msg.ptr_pos.image_x = 0;
296 msg.ptr_pos.image_y = 0;
297 synthvid_send(hdev, &msg);
299 memset(&msg, 0, sizeof(struct synthvid_msg));
300 msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE;
301 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
302 sizeof(struct synthvid_pointer_shape);
303 msg.ptr_shape.part_idx = CURSOR_COMPLETE;
304 msg.ptr_shape.is_argb = 1;
305 msg.ptr_shape.width = 1;
306 msg.ptr_shape.height = 1;
307 msg.ptr_shape.hot_x = 0;
308 msg.ptr_shape.hot_y = 0;
309 msg.ptr_shape.data[0] = 0;
310 msg.ptr_shape.data[1] = 1;
311 msg.ptr_shape.data[2] = 1;
312 msg.ptr_shape.data[3] = 1;
313 synthvid_send(hdev, &msg);
318 /* Send updated screen area (dirty rectangle) location to host */
319 static int synthvid_update(struct fb_info *info)
321 struct hv_device *hdev = device_to_hv_device(info->device);
322 struct synthvid_msg msg;
324 memset(&msg, 0, sizeof(struct synthvid_msg));
326 msg.vid_hdr.type = SYNTHVID_DIRT;
327 msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
328 sizeof(struct synthvid_dirt);
329 msg.dirt.video_output = 0;
330 msg.dirt.dirt_count = 1;
331 msg.dirt.rect[0].x1 = 0;
332 msg.dirt.rect[0].y1 = 0;
333 msg.dirt.rect[0].x2 = info->var.xres;
334 msg.dirt.rect[0].y2 = info->var.yres;
336 synthvid_send(hdev, &msg);
343 * Actions on received messages from host:
344 * Complete the wait event.
345 * Or, reply with screen and cursor info.
347 static void synthvid_recv_sub(struct hv_device *hdev)
349 struct fb_info *info = hv_get_drvdata(hdev);
350 struct hvfb_par *par;
351 struct synthvid_msg *msg;
357 msg = (struct synthvid_msg *)par->recv_buf;
359 /* Complete the wait event */
360 if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE ||
361 msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) {
362 memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE);
363 complete(&par->wait);
367 /* Reply with screen and cursor info */
368 if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) {
370 synthvid_send_ptr(hdev);
371 synthvid_send_situ(hdev);
374 par->update = msg->feature_chg.is_dirt_needed;
376 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
380 /* Receive callback for messages from the host */
381 static void synthvid_receive(void *ctx)
383 struct hv_device *hdev = ctx;
384 struct fb_info *info = hv_get_drvdata(hdev);
385 struct hvfb_par *par;
386 struct synthvid_msg *recv_buf;
395 recv_buf = (struct synthvid_msg *)par->recv_buf;
398 ret = vmbus_recvpacket(hdev->channel, recv_buf,
400 &bytes_recvd, &req_id);
401 if (bytes_recvd > 0 &&
402 recv_buf->pipe_hdr.type == PIPE_MSG_DATA)
403 synthvid_recv_sub(hdev);
404 } while (bytes_recvd > 0 && ret == 0);
407 /* Check synthetic video protocol version with the host */
408 static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver)
410 struct fb_info *info = hv_get_drvdata(hdev);
411 struct hvfb_par *par = info->par;
412 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
415 memset(msg, 0, sizeof(struct synthvid_msg));
416 msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST;
417 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
418 sizeof(struct synthvid_version_req);
419 msg->ver_req.version = ver;
420 synthvid_send(hdev, msg);
422 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
424 pr_err("Time out on waiting version response\n");
428 if (!msg->ver_resp.is_accepted) {
433 par->synthvid_version = ver;
439 /* Connect to VSP (Virtual Service Provider) on host */
440 static int synthvid_connect_vsp(struct hv_device *hdev)
442 struct fb_info *info = hv_get_drvdata(hdev);
443 struct hvfb_par *par = info->par;
446 ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE,
447 NULL, 0, synthvid_receive, hdev);
449 pr_err("Unable to open vmbus channel\n");
453 /* Negotiate the protocol version with host */
454 if (vmbus_proto_version == VERSION_WS2008 ||
455 vmbus_proto_version == VERSION_WIN7)
456 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7);
458 ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
461 pr_err("Synthetic video device version not accepted\n");
465 if (par->synthvid_version == SYNTHVID_VERSION_WIN7)
466 screen_depth = SYNTHVID_DEPTH_WIN7;
468 screen_depth = SYNTHVID_DEPTH_WIN8;
470 screen_fb_size = hdev->channel->offermsg.offer.
471 mmio_megabytes * 1024 * 1024;
476 vmbus_close(hdev->channel);
480 /* Send VRAM and Situation messages to the host */
481 static int synthvid_send_config(struct hv_device *hdev)
483 struct fb_info *info = hv_get_drvdata(hdev);
484 struct hvfb_par *par = info->par;
485 struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf;
488 /* Send VRAM location */
489 memset(msg, 0, sizeof(struct synthvid_msg));
490 msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;
491 msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
492 sizeof(struct synthvid_vram_location);
493 msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start;
494 msg->vram.is_vram_gpa_specified = 1;
495 synthvid_send(hdev, msg);
497 t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
499 pr_err("Time out on waiting vram location ack\n");
503 if (msg->vram_ack.user_ctx != info->fix.smem_start) {
504 pr_err("Unable to set VRAM location\n");
509 /* Send pointer and situation update */
510 synthvid_send_ptr(hdev);
511 synthvid_send_situ(hdev);
519 * Delayed work callback:
520 * It is called at HVFB_UPDATE_DELAY or longer time interval to process
521 * screen updates. It is re-scheduled if further update is necessary.
523 static void hvfb_update_work(struct work_struct *w)
525 struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);
526 struct fb_info *info = par->info;
529 synthvid_update(info);
532 schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
536 /* Framebuffer operation handlers */
538 static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
540 if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN ||
541 var->xres > screen_width || var->yres > screen_height ||
542 var->bits_per_pixel != screen_depth)
545 var->xres_virtual = var->xres;
546 var->yres_virtual = var->yres;
551 static int hvfb_set_par(struct fb_info *info)
553 struct hv_device *hdev = device_to_hv_device(info->device);
555 return synthvid_send_situ(hdev);
559 static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf)
561 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset;
564 static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green,
565 unsigned blue, unsigned transp, struct fb_info *info)
567 u32 *pal = info->pseudo_palette;
572 pal[regno] = chan_to_field(red, &info->var.red)
573 | chan_to_field(green, &info->var.green)
574 | chan_to_field(blue, &info->var.blue)
575 | chan_to_field(transp, &info->var.transp);
580 static int hvfb_blank(int blank, struct fb_info *info)
582 return 1; /* get fb_blank to set the colormap to all black */
585 static struct fb_ops hvfb_ops = {
586 .owner = THIS_MODULE,
587 .fb_check_var = hvfb_check_var,
588 .fb_set_par = hvfb_set_par,
589 .fb_setcolreg = hvfb_setcolreg,
590 .fb_fillrect = cfb_fillrect,
591 .fb_copyarea = cfb_copyarea,
592 .fb_imageblit = cfb_imageblit,
593 .fb_blank = hvfb_blank,
597 /* Get options from kernel paramenter "video=" */
598 static void hvfb_get_option(struct fb_info *info)
600 struct hvfb_par *par = info->par;
601 char *opt = NULL, *p;
604 if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt)
607 p = strsep(&opt, "x");
608 if (!*p || kstrtouint(p, 0, &x) ||
609 !opt || !*opt || kstrtouint(opt, 0, &y)) {
610 pr_err("Screen option is invalid: skipped\n");
614 if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN ||
615 (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
616 x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) ||
617 (par->synthvid_version == SYNTHVID_VERSION_WIN7 &&
618 (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) {
619 pr_err("Screen resolution option is out of range: skipped\n");
629 /* Get framebuffer memory from Hyper-V video pci space */
630 static int hvfb_getmem(struct fb_info *info)
632 struct hvfb_par *par = info->par;
633 struct pci_dev *pdev = NULL;
634 void __iomem *fb_virt;
635 int gen2vm = efi_enabled(EFI_BOOT);
638 par->mem.name = KBUILD_MODNAME;
639 par->mem.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
641 ret = allocate_resource(&hyperv_mmio, &par->mem,
647 pr_err("Unable to allocate framebuffer memory\n");
651 pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT,
652 PCI_DEVICE_ID_HYPERV_VIDEO, NULL);
654 pr_err("Unable to find PCI Hyper-V video\n");
658 if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) ||
659 pci_resource_len(pdev, 0) < screen_fb_size)
662 par->mem.end = pci_resource_end(pdev, 0);
663 par->mem.start = par->mem.end - screen_fb_size + 1;
664 ret = request_resource(&pdev->resource[0], &par->mem);
666 pr_err("Unable to request framebuffer memory\n");
671 fb_virt = ioremap(par->mem.start, screen_fb_size);
675 info->apertures = alloc_apertures(1);
676 if (!info->apertures)
680 info->apertures->ranges[0].base = screen_info.lfb_base;
681 info->apertures->ranges[0].size = screen_info.lfb_size;
682 remove_conflicting_framebuffers(info->apertures,
683 KBUILD_MODNAME, false);
685 info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
686 info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
689 info->fix.smem_start = par->mem.start;
690 info->fix.smem_len = screen_fb_size;
691 info->screen_base = fb_virt;
692 info->screen_size = screen_fb_size;
702 release_resource(&par->mem);
710 /* Release the framebuffer */
711 static void hvfb_putmem(struct fb_info *info)
713 struct hvfb_par *par = info->par;
715 iounmap(info->screen_base);
716 release_resource(&par->mem);
720 static int hvfb_probe(struct hv_device *hdev,
721 const struct hv_vmbus_device_id *dev_id)
723 struct fb_info *info;
724 struct hvfb_par *par;
727 info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device);
729 pr_err("No memory for framebuffer info\n");
735 par->fb_ready = false;
736 init_completion(&par->wait);
737 INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
740 hv_set_drvdata(hdev, info);
741 ret = synthvid_connect_vsp(hdev);
743 pr_err("Unable to connect to VSP\n");
747 ret = hvfb_getmem(info);
749 pr_err("No memory for framebuffer\n");
753 hvfb_get_option(info);
754 pr_info("Screen resolution: %dx%d, Color depth: %d\n",
755 screen_width, screen_height, screen_depth);
759 info->flags = FBINFO_DEFAULT;
761 info->var.xres_virtual = info->var.xres = screen_width;
762 info->var.yres_virtual = info->var.yres = screen_height;
763 info->var.bits_per_pixel = screen_depth;
765 if (info->var.bits_per_pixel == 16) {
766 info->var.red = (struct fb_bitfield){11, 5, 0};
767 info->var.green = (struct fb_bitfield){5, 6, 0};
768 info->var.blue = (struct fb_bitfield){0, 5, 0};
769 info->var.transp = (struct fb_bitfield){0, 0, 0};
771 info->var.red = (struct fb_bitfield){16, 8, 0};
772 info->var.green = (struct fb_bitfield){8, 8, 0};
773 info->var.blue = (struct fb_bitfield){0, 8, 0};
774 info->var.transp = (struct fb_bitfield){24, 8, 0};
777 info->var.activate = FB_ACTIVATE_NOW;
778 info->var.height = -1;
779 info->var.width = -1;
780 info->var.vmode = FB_VMODE_NONINTERLACED;
782 strcpy(info->fix.id, KBUILD_MODNAME);
783 info->fix.type = FB_TYPE_PACKED_PIXELS;
784 info->fix.visual = FB_VISUAL_TRUECOLOR;
785 info->fix.line_length = screen_width * screen_depth / 8;
786 info->fix.accel = FB_ACCEL_NONE;
788 info->fbops = &hvfb_ops;
789 info->pseudo_palette = par->pseudo_palette;
791 /* Send config to host */
792 ret = synthvid_send_config(hdev);
796 ret = register_framebuffer(info);
798 pr_err("Unable to register framebuffer\n");
802 par->fb_ready = true;
809 vmbus_close(hdev->channel);
811 cancel_delayed_work_sync(&par->dwork);
812 hv_set_drvdata(hdev, NULL);
813 framebuffer_release(info);
818 static int hvfb_remove(struct hv_device *hdev)
820 struct fb_info *info = hv_get_drvdata(hdev);
821 struct hvfb_par *par = info->par;
824 par->fb_ready = false;
826 unregister_framebuffer(info);
827 cancel_delayed_work_sync(&par->dwork);
829 vmbus_close(hdev->channel);
830 hv_set_drvdata(hdev, NULL);
833 framebuffer_release(info);
839 static DEFINE_PCI_DEVICE_TABLE(pci_stub_id_table) = {
841 .vendor = PCI_VENDOR_ID_MICROSOFT,
842 .device = PCI_DEVICE_ID_HYPERV_VIDEO,
844 { /* end of list */ }
847 static const struct hv_vmbus_device_id id_table[] = {
848 /* Synthetic Video Device GUID */
853 MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
854 MODULE_DEVICE_TABLE(vmbus, id_table);
856 static struct hv_driver hvfb_drv = {
857 .name = KBUILD_MODNAME,
858 .id_table = id_table,
860 .remove = hvfb_remove,
863 static int hvfb_pci_stub_probe(struct pci_dev *pdev,
864 const struct pci_device_id *ent)
869 static void hvfb_pci_stub_remove(struct pci_dev *pdev)
873 static struct pci_driver hvfb_pci_stub_driver = {
874 .name = KBUILD_MODNAME,
875 .id_table = pci_stub_id_table,
876 .probe = hvfb_pci_stub_probe,
877 .remove = hvfb_pci_stub_remove,
880 static int __init hvfb_drv_init(void)
884 ret = vmbus_driver_register(&hvfb_drv);
888 ret = pci_register_driver(&hvfb_pci_stub_driver);
890 vmbus_driver_unregister(&hvfb_drv);
897 static void __exit hvfb_drv_exit(void)
899 pci_unregister_driver(&hvfb_pci_stub_driver);
900 vmbus_driver_unregister(&hvfb_drv);
903 module_init(hvfb_drv_init);
904 module_exit(hvfb_drv_exit);
906 MODULE_LICENSE("GPL");
907 MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");