diff options
Diffstat (limited to 'drivers/video/hyperv_fb.c')
| -rw-r--r-- | drivers/video/hyperv_fb.c | 829 |
1 files changed, 829 insertions, 0 deletions
diff --git a/drivers/video/hyperv_fb.c b/drivers/video/hyperv_fb.c new file mode 100644 index 000000000000..d4d2c5fe2488 --- /dev/null +++ b/drivers/video/hyperv_fb.c @@ -0,0 +1,829 @@ +/* + * Copyright (c) 2012, Microsoft Corporation. + * + * Author: + * Haiyang Zhang <haiyangz@microsoft.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + */ + +/* + * Hyper-V Synthetic Video Frame Buffer Driver + * + * This is the driver for the Hyper-V Synthetic Video, which supports + * screen resolution up to Full HD 1920x1080 with 32 bit color on Windows + * Server 2012, and 1600x1200 with 16 bit color on Windows Server 2008 R2 + * or earlier. + * + * It also solves the double mouse cursor issue of the emulated video mode. + * + * The default screen resolution is 1152x864, which may be changed by a + * kernel parameter: + * video=hyperv_fb:<width>x<height> + * For example: video=hyperv_fb:1280x1024 + * + * Portrait orientation is also supported: + * For example: video=hyperv_fb:864x1152 + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/completion.h> +#include <linux/fb.h> +#include <linux/pci.h> + +#include <linux/hyperv.h> + + +/* Hyper-V Synthetic Video Protocol definitions and structures */ +#define MAX_VMBUS_PKT_SIZE 0x4000 + +#define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) +#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) +#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) + +#define SYNTHVID_DEPTH_WIN7 16 +#define SYNTHVID_DEPTH_WIN8 32 + +#define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024) +#define SYNTHVID_WIDTH_MAX_WIN7 1600 +#define SYNTHVID_HEIGHT_MAX_WIN7 1200 + +#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) + +#define PCI_VENDOR_ID_MICROSOFT 0x1414 +#define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 + + +enum pipe_msg_type { + PIPE_MSG_INVALID, + PIPE_MSG_DATA, + PIPE_MSG_MAX +}; + +struct pipe_msg_hdr { + u32 type; + u32 size; /* size of message after this field */ +} __packed; + + +enum synthvid_msg_type { + SYNTHVID_ERROR = 0, + SYNTHVID_VERSION_REQUEST = 1, + SYNTHVID_VERSION_RESPONSE = 2, + SYNTHVID_VRAM_LOCATION = 3, + SYNTHVID_VRAM_LOCATION_ACK = 4, + SYNTHVID_SITUATION_UPDATE = 5, + SYNTHVID_SITUATION_UPDATE_ACK = 6, + SYNTHVID_POINTER_POSITION = 7, + SYNTHVID_POINTER_SHAPE = 8, + SYNTHVID_FEATURE_CHANGE = 9, + SYNTHVID_DIRT = 10, + + SYNTHVID_MAX = 11 +}; + +struct synthvid_msg_hdr { + u32 type; + u32 size; /* size of this header + payload after this field*/ +} __packed; + + +struct synthvid_version_req { + u32 version; +} __packed; + +struct synthvid_version_resp { + u32 version; + u8 is_accepted; + u8 max_video_outputs; +} __packed; + +struct synthvid_vram_location { + u64 user_ctx; + u8 is_vram_gpa_specified; + u64 vram_gpa; +} __packed; + +struct synthvid_vram_location_ack { + u64 user_ctx; +} __packed; + +struct video_output_situation { + u8 active; + u32 vram_offset; + u8 depth_bits; + u32 width_pixels; + u32 height_pixels; + u32 pitch_bytes; +} __packed; + +struct synthvid_situation_update { + u64 user_ctx; + u8 video_output_count; + struct video_output_situation video_output[1]; +} __packed; + +struct synthvid_situation_update_ack { + u64 user_ctx; +} __packed; + +struct synthvid_pointer_position { + u8 is_visible; + u8 video_output; + s32 image_x; + s32 image_y; +} __packed; + + +#define CURSOR_MAX_X 96 +#define CURSOR_MAX_Y 96 +#define CURSOR_ARGB_PIXEL_SIZE 4 +#define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) +#define CURSOR_COMPLETE (-1) + +struct synthvid_pointer_shape { + u8 part_idx; + u8 is_argb; + u32 width; /* CURSOR_MAX_X at most */ + u32 height; /* CURSOR_MAX_Y at most */ + u32 hot_x; /* hotspot relative to upper-left of pointer image */ + u32 hot_y; + u8 data[4]; +} __packed; + +struct synthvid_feature_change { + u8 is_dirt_needed; + u8 is_ptr_pos_needed; + u8 is_ptr_shape_needed; + u8 is_situ_needed; +} __packed; + +struct rect { + s32 x1, y1; /* top left corner */ + s32 x2, y2; /* bottom right corner, exclusive */ +} __packed; + +struct synthvid_dirt { + u8 video_output; + u8 dirt_count; + struct rect rect[1]; +} __packed; + +struct synthvid_msg { + struct pipe_msg_hdr pipe_hdr; + struct synthvid_msg_hdr vid_hdr; + union { + struct synthvid_version_req ver_req; + struct synthvid_version_resp ver_resp; + struct synthvid_vram_location vram; + struct synthvid_vram_location_ack vram_ack; + struct synthvid_situation_update situ; + struct synthvid_situation_update_ack situ_ack; + struct synthvid_pointer_position ptr_pos; + struct synthvid_pointer_shape ptr_shape; + struct synthvid_feature_change feature_chg; + struct synthvid_dirt dirt; + }; +} __packed; + + + +/* FB driver definitions and structures */ +#define HVFB_WIDTH 1152 /* default screen width */ +#define HVFB_HEIGHT 864 /* default screen height */ +#define HVFB_WIDTH_MIN 640 +#define HVFB_HEIGHT_MIN 480 + +#define RING_BUFSIZE (256 * 1024) +#define VSP_TIMEOUT (10 * HZ) +#define HVFB_UPDATE_DELAY (HZ / 20) + +struct hvfb_par { + struct fb_info *info; + bool fb_ready; /* fb device is ready */ + struct completion wait; + u32 synthvid_version; + + struct delayed_work dwork; + bool update; + + u32 pseudo_palette[16]; + u8 init_buf[MAX_VMBUS_PKT_SIZE]; + u8 recv_buf[MAX_VMBUS_PKT_SIZE]; +}; + +static uint screen_width = HVFB_WIDTH; +static uint screen_height = HVFB_HEIGHT; +static uint screen_depth; +static uint screen_fb_size; + +/* Send message to Hyper-V host */ +static inline int synthvid_send(struct hv_device *hdev, + struct synthvid_msg *msg) +{ + static atomic64_t request_id = ATOMIC64_INIT(0); + int ret; + + msg->pipe_hdr.type = PIPE_MSG_DATA; + msg->pipe_hdr.size = msg->vid_hdr.size; + + ret = vmbus_sendpacket(hdev->channel, msg, + msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), + atomic64_inc_return(&request_id), + VM_PKT_DATA_INBAND, 0); + + if (ret) + pr_err("Unable to send packet via vmbus\n"); + + return ret; +} + + +/* Send screen resolution info to host */ +static int synthvid_send_situ(struct hv_device *hdev) +{ + struct fb_info *info = hv_get_drvdata(hdev); + struct synthvid_msg msg; + + if (!info) + return -ENODEV; + + memset(&msg, 0, sizeof(struct synthvid_msg)); + + msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + + sizeof(struct synthvid_situation_update); + msg.situ.user_ctx = 0; + msg.situ.video_output_count = 1; + msg.situ.video_output[0].active = 1; + msg.situ.video_output[0].vram_offset = 0; + msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; + msg.situ.video_output[0].width_pixels = info->var.xres; + msg.situ.video_output[0].height_pixels = info->var.yres; + msg.situ.video_output[0].pitch_bytes = info->fix.line_length; + + synthvid_send(hdev, &msg); + + return 0; +} + +/* Send mouse pointer info to host */ +static int synthvid_send_ptr(struct hv_device *hdev) +{ + struct synthvid_msg msg; + + memset(&msg, 0, sizeof(struct synthvid_msg)); + msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + + sizeof(struct synthvid_pointer_position); + msg.ptr_pos.is_visible = 1; + msg.ptr_pos.video_output = 0; + msg.ptr_pos.image_x = 0; + msg.ptr_pos.image_y = 0; + synthvid_send(hdev, &msg); + + memset(&msg, 0, sizeof(struct synthvid_msg)); + msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + + sizeof(struct synthvid_pointer_shape); + msg.ptr_shape.part_idx = CURSOR_COMPLETE; + msg.ptr_shape.is_argb = 1; + msg.ptr_shape.width = 1; + msg.ptr_shape.height = 1; + msg.ptr_shape.hot_x = 0; + msg.ptr_shape.hot_y = 0; + msg.ptr_shape.data[0] = 0; + msg.ptr_shape.data[1] = 1; + msg.ptr_shape.data[2] = 1; + msg.ptr_shape.data[3] = 1; + synthvid_send(hdev, &msg); + + return 0; +} + +/* Send updated screen area (dirty rectangle) location to host */ +static int synthvid_update(struct fb_info *info) +{ + struct hv_device *hdev = device_to_hv_device(info->device); + struct synthvid_msg msg; + + memset(&msg, 0, sizeof(struct synthvid_msg)); + + msg.vid_hdr.type = SYNTHVID_DIRT; + msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + + sizeof(struct synthvid_dirt); + msg.dirt.video_output = 0; + msg.dirt.dirt_count = 1; + msg.dirt.rect[0].x1 = 0; + msg.dirt.rect[0].y1 = 0; + msg.dirt.rect[0].x2 = info->var.xres; + msg.dirt.rect[0].y2 = info->var.yres; + + synthvid_send(hdev, &msg); + + return 0; +} + + +/* + * Actions on received messages from host: + * Complete the wait event. + * Or, reply with screen and cursor info. + */ +static void synthvid_recv_sub(struct hv_device *hdev) +{ + struct fb_info *info = hv_get_drvdata(hdev); + struct hvfb_par *par; + struct synthvid_msg *msg; + + if (!info) + return; + + par = info->par; + msg = (struct synthvid_msg *)par->recv_buf; + + /* Complete the wait event */ + if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || + msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { + memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); + complete(&par->wait); + return; + } + + /* Reply with screen and cursor info */ + if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { + if (par->fb_ready) { + synthvid_send_ptr(hdev); + synthvid_send_situ(hdev); + } + + par->update = msg->feature_chg.is_dirt_needed; + if (par->update) + schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); + } +} + +/* Receive callback for messages from the host */ +static void synthvid_receive(void *ctx) +{ + struct hv_device *hdev = ctx; + struct fb_info *info = hv_get_drvdata(hdev); + struct hvfb_par *par; + struct synthvid_msg *recv_buf; + u32 bytes_recvd; + u64 req_id; + int ret; + + if (!info) + return; + + par = info->par; + recv_buf = (struct synthvid_msg *)par->recv_buf; + + do { + ret = vmbus_recvpacket(hdev->channel, recv_buf, + MAX_VMBUS_PKT_SIZE, + &bytes_recvd, &req_id); + if (bytes_recvd > 0 && + recv_buf->pipe_hdr.type == PIPE_MSG_DATA) + synthvid_recv_sub(hdev); + } while (bytes_recvd > 0 && ret == 0); +} + +/* Check synthetic video protocol version with the host */ +static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) +{ + struct fb_info *info = hv_get_drvdata(hdev); + struct hvfb_par *par = info->par; + struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; + int t, ret = 0; + + memset(msg, 0, sizeof(struct synthvid_msg)); + msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; + msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + + sizeof(struct synthvid_version_req); + msg->ver_req.version = ver; + synthvid_send(hdev, msg); + + t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); + if (!t) { + pr_err("Time out on waiting version response\n"); + ret = -ETIMEDOUT; + goto out; + } + if (!msg->ver_resp.is_accepted) { + ret = -ENODEV; + goto out; + } + + par->synthvid_version = ver; + +out: + return ret; +} + +/* Connect to VSP (Virtual Service Provider) on host */ +static int synthvid_connect_vsp(struct hv_device *hdev) +{ + struct fb_info *info = hv_get_drvdata(hdev); + struct hvfb_par *par = info->par; + int ret; + + ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, + NULL, 0, synthvid_receive, hdev); + if (ret) { + pr_err("Unable to open vmbus channel\n"); + return ret; + } + + /* Negotiate the protocol version with host */ + if (vmbus_proto_version == VERSION_WS2008 || + vmbus_proto_version == VERSION_WIN7) + ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); + else + ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); + + if (ret) { + pr_err("Synthetic video device version not accepted\n"); + goto error; + } + + if (par->synthvid_version == SYNTHVID_VERSION_WIN7) { + screen_depth = SYNTHVID_DEPTH_WIN7; + screen_fb_size = SYNTHVID_FB_SIZE_WIN7; + } else { + screen_depth = SYNTHVID_DEPTH_WIN8; + screen_fb_size = SYNTHVID_FB_SIZE_WIN8; + } + + return 0; + +error: + vmbus_close(hdev->channel); + return ret; +} + +/* Send VRAM and Situation messages to the host */ +static int synthvid_send_config(struct hv_device *hdev) +{ + struct fb_info *info = hv_get_drvdata(hdev); + struct hvfb_par *par = info->par; + struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; + int t, ret = 0; + + /* Send VRAM location */ + memset(msg, 0, sizeof(struct synthvid_msg)); + msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; + msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + + sizeof(struct synthvid_vram_location); + msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start; + msg->vram.is_vram_gpa_specified = 1; + synthvid_send(hdev, msg); + + t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); + if (!t) { + pr_err("Time out on waiting vram location ack\n"); + ret = -ETIMEDOUT; + goto out; + } + if (msg->vram_ack.user_ctx != info->fix.smem_start) { + pr_err("Unable to set VRAM location\n"); + ret = -ENODEV; + goto out; + } + + /* Send pointer and situation update */ + synthvid_send_ptr(hdev); + synthvid_send_situ(hdev); + +out: + return ret; +} + + +/* + * Delayed work callback: + * It is called at HVFB_UPDATE_DELAY or longer time interval to process + * screen updates. It is re-scheduled if further update is necessary. + */ +static void hvfb_update_work(struct work_struct *w) +{ + struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); + struct fb_info *info = par->info; + + if (par->fb_ready) + synthvid_update(info); + + if (par->update) + schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); +} + + +/* Framebuffer operation handlers */ + +static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) +{ + if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || + var->xres > screen_width || var->yres > screen_height || + var->bits_per_pixel != screen_depth) + return -EINVAL; + + var->xres_virtual = var->xres; + var->yres_virtual = var->yres; + + return 0; +} + +static int hvfb_set_par(struct fb_info *info) +{ + struct hv_device *hdev = device_to_hv_device(info->device); + + return synthvid_send_situ(hdev); +} + + +static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) +{ + return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; +} + +static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, + unsigned blue, unsigned transp, struct fb_info *info) +{ + u32 *pal = info->pseudo_palette; + + if (regno > 15) + return -EINVAL; + + pal[regno] = chan_to_field(red, &info->var.red) + | chan_to_field(green, &info->var.green) + | chan_to_field(blue, &info->var.blue) + | chan_to_field(transp, &info->var.transp); + + return 0; +} + + +static struct fb_ops hvfb_ops = { + .owner = THIS_MODULE, + .fb_check_var = hvfb_check_var, + .fb_set_par = hvfb_set_par, + .fb_setcolreg = hvfb_setcolreg, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, +}; + + +/* Get options from kernel paramenter "video=" */ +static void hvfb_get_option(struct fb_info *info) +{ + struct hvfb_par *par = info->par; + char *opt = NULL, *p; + uint x = 0, y = 0; + + if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) + return; + + p = strsep(&opt, "x"); + if (!*p || kstrtouint(p, 0, &x) || + !opt || !*opt || kstrtouint(opt, 0, &y)) { + pr_err("Screen option is invalid: skipped\n"); + return; + } + + if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || + (par->synthvid_version == SYNTHVID_VERSION_WIN8 && + x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || + (par->synthvid_version == SYNTHVID_VERSION_WIN7 && + (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { + pr_err("Screen resolution option is out of range: skipped\n"); + return; + } + + screen_width = x; + screen_height = y; + return; +} + + +/* Get framebuffer memory from Hyper-V video pci space */ +static int hvfb_getmem(struct fb_info *info) +{ + struct pci_dev *pdev; + ulong fb_phys; + void __iomem *fb_virt; + + pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, + PCI_DEVICE_ID_HYPERV_VIDEO, NULL); + if (!pdev) { + pr_err("Unable to find PCI Hyper-V video\n"); + return -ENODEV; + } + + if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) || + pci_resource_len(pdev, 0) < screen_fb_size) + goto err1; + + fb_phys = pci_resource_end(pdev, 0) - screen_fb_size + 1; + if (!request_mem_region(fb_phys, screen_fb_size, KBUILD_MODNAME)) + goto err1; + + fb_virt = ioremap(fb_phys, screen_fb_size); + if (!fb_virt) + goto err2; + + info->apertures = alloc_apertures(1); + if (!info->apertures) + goto err3; + + info->apertures->ranges[0].base = pci_resource_start(pdev, 0); + info->apertures->ranges[0].size = pci_resource_len(pdev, 0); + info->fix.smem_start = fb_phys; + info->fix.smem_len = screen_fb_size; + info->screen_base = fb_virt; + info->screen_size = screen_fb_size; + + pci_dev_put(pdev); + return 0; + +err3: + iounmap(fb_virt); +err2: + release_mem_region(fb_phys, screen_fb_size); +err1: + pci_dev_put(pdev); + return -ENOMEM; +} + +/* Release the framebuffer */ +static void hvfb_putmem(struct fb_info *info) +{ + iounmap(info->screen_base); + release_mem_region(info->fix.smem_start, screen_fb_size); +} + + +static int hvfb_probe(struct hv_device *hdev, + const struct hv_vmbus_device_id *dev_id) +{ + struct fb_info *info; + struct hvfb_par *par; + int ret; + + info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); + if (!info) { + pr_err("No memory for framebuffer info\n"); + return -ENOMEM; + } + + par = info->par; + par->info = info; + par->fb_ready = false; + init_completion(&par->wait); + INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); + + /* Connect to VSP */ + hv_set_drvdata(hdev, info); + ret = synthvid_connect_vsp(hdev); + if (ret) { + pr_err("Unable to connect to VSP\n"); + goto error1; + } + + ret = hvfb_getmem(info); + if (ret) { + pr_err("No memory for framebuffer\n"); + goto error2; + } + + hvfb_get_option(info); + pr_info("Screen resolution: %dx%d, Color depth: %d\n", + screen_width, screen_height, screen_depth); + + + /* Set up fb_info */ + info->flags = FBINFO_DEFAULT; + + info->var.xres_virtual = info->var.xres = screen_width; + info->var.yres_virtual = info->var.yres = screen_height; + info->var.bits_per_pixel = screen_depth; + + if (info->var.bits_per_pixel == 16) { + info->var.red = (struct fb_bitfield){11, 5, 0}; + info->var.green = (struct fb_bitfield){5, 6, 0}; + info->var.blue = (struct fb_bitfield){0, 5, 0}; + info->var.transp = (struct fb_bitfield){0, 0, 0}; + } else { + info->var.red = (struct fb_bitfield){16, 8, 0}; + info->var.green = (struct fb_bitfield){8, 8, 0}; + info->var.blue = (struct fb_bitfield){0, 8, 0}; + info->var.transp = (struct fb_bitfield){24, 8, 0}; + } + + info->var.activate = FB_ACTIVATE_NOW; + info->var.height = -1; + info->var.width = -1; + info->var.vmode = FB_VMODE_NONINTERLACED; + + strcpy(info->fix.id, KBUILD_MODNAME); + info->fix.type = FB_TYPE_PACKED_PIXELS; + info->fix.visual = FB_VISUAL_TRUECOLOR; + info->fix.line_length = screen_width * screen_depth / 8; + info->fix.accel = FB_ACCEL_NONE; + + info->fbops = &hvfb_ops; + info->pseudo_palette = par->pseudo_palette; + + /* Send config to host */ + ret = synthvid_send_config(hdev); + if (ret) + goto error; + + ret = register_framebuffer(info); + if (ret) { + pr_err("Unable to register framebuffer\n"); + goto error; + } + + par->fb_ready = true; + + return 0; + +error: + hvfb_putmem(info); +error2: + vmbus_close(hdev->channel); +error1: + cancel_delayed_work_sync(&par->dwork); + hv_set_drvdata(hdev, NULL); + framebuffer_release(info); + return ret; +} + + +static int hvfb_remove(struct hv_device *hdev) +{ + struct fb_info *info = hv_get_drvdata(hdev); + struct hvfb_par *par = info->par; + + par->update = false; + par->fb_ready = false; + + unregister_framebuffer(info); + cancel_delayed_work_sync(&par->dwork); + + vmbus_close(hdev->channel); + hv_set_drvdata(hdev, NULL); + + hvfb_putmem(info); + framebuffer_release(info); + + return 0; +} + + +static const struct hv_vmbus_device_id id_table[] = { + /* Synthetic Video Device GUID */ + {HV_SYNTHVID_GUID}, + {} +}; + +MODULE_DEVICE_TABLE(vmbus, id_table); + +static struct hv_driver hvfb_drv = { + .name = KBUILD_MODNAME, + .id_table = id_table, + .probe = hvfb_probe, + .remove = hvfb_remove, +}; + + +static int __init hvfb_drv_init(void) +{ + return vmbus_driver_register(&hvfb_drv); +} + +static void __exit hvfb_drv_exit(void) +{ + vmbus_driver_unregister(&hvfb_drv); +} + +module_init(hvfb_drv_init); +module_exit(hvfb_drv_exit); + +MODULE_LICENSE("GPL"); +MODULE_VERSION(HV_DRV_VERSION); +MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); |