Signed-off-by: Prasanna Kumar T S M <p...@linux.microsoft.com>
---
MAINTAINERS | 1 -
drivers/video/fbdev/Kconfig | 8 -
drivers/video/fbdev/Makefile | 1 -
drivers/video/fbdev/hyperv_fb.c | 1386 -------------------------------
4 files changed, 1396 deletions(-)
delete mode 100644 drivers/video/fbdev/hyperv_fb.c
diff --git a/MAINTAINERS b/MAINTAINERS
index e94d68c980c5..9d0f0e929356 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11416,7 +11416,6 @@ F: drivers/pci/controller/pci-hyperv-intf.c
F: drivers/pci/controller/pci-hyperv.c
F: drivers/scsi/storvsc_drv.c
F: drivers/uio/uio_hv_generic.c
-F: drivers/video/fbdev/hyperv_fb.c
F: include/asm-generic/mshyperv.h
F: include/clocksource/hyperv_timer.h
F: include/hyperv/hvgdk.h
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index c21484d15f0c..bb8ac759f6aa 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1772,14 +1772,6 @@ config FB_BROADSHEET
and could also have been called by other names when coupled with
a bridge adapter.
-config FB_HYPERV
- tristate "Microsoft Hyper-V Synthetic Video support"
- depends on FB && HYPERV
- select DMA_CMA if HAVE_DMA_CONTIGUOUS && CMA
- select FB_IOMEM_HELPERS_DEFERRED
- help
- This framebuffer driver supports Microsoft Hyper-V Synthetic Video.
-
config FB_SIMPLE
tristate "Simple framebuffer support"
depends on FB
diff --git a/drivers/video/fbdev/Makefile b/drivers/video/fbdev/Makefile
index b3d12f977c06..36a18d958ba0 100644
--- a/drivers/video/fbdev/Makefile
+++ b/drivers/video/fbdev/Makefile
@@ -111,7 +111,6 @@ obj-y += omap2/
obj-$(CONFIG_XEN_FBDEV_FRONTEND) += xen-fbfront.o
obj-$(CONFIG_FB_CARMINE) += carminefb.o
obj-$(CONFIG_FB_MB862XX) += mb862xx/
-obj-$(CONFIG_FB_HYPERV) += hyperv_fb.o
obj-$(CONFIG_FB_OPENCORES) += ocfb.o
obj-$(CONFIG_FB_SM712) += sm712fb.o
diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c
deleted file mode 100644
index 75338ffc703f..000000000000
--- a/drivers/video/fbdev/hyperv_fb.c
+++ /dev/null
@@ -1,1386 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2012, Microsoft Corporation.
- *
- * Author:
- * Haiyang Zhang <haiya...@microsoft.com>
- */
-
-/*
- * 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
- *
- * When a Windows 10 RS5+ host is used, the virtual machine screen
- * resolution is obtained from the host. The "video=hyperv_fb" option is
- * not needed, but still can be used to overwrite what the host specifies.
- * The VM resolution on the host could be set by executing the powershell
- * "set-vmvideo" command. For example
- * set-vmvideo -vmname name -horizontalresolution:1920 \
- * -verticalresolution:1200 -resolutiontype single
- *
- * Gen 1 VMs also support direct using VM's physical memory for framebuffer.
- * It could improve the efficiency and performance for framebuffer and VM.
- * This requires to allocate contiguous physical memory from Linux kernel's
- * CMA memory allocator. To enable this, supply a kernel parameter to give
- * enough memory space to CMA allocator for framebuffer. For example:
- * cma=130m
- * This gives 130MB memory to CMA allocator that can be allocated to
- * framebuffer. For reference, 8K resolution (7680x4320) takes about
- * 127MB memory.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/aperture.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/vmalloc.h>
-#include <linux/init.h>
-#include <linux/completion.h>
-#include <linux/fb.h>
-#include <linux/pci.h>
-#include <linux/panic_notifier.h>
-#include <linux/efi.h>
-#include <linux/console.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))
-/* Support for VERSION_WIN7 is removed. #define is retained for reference. */
-#define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0)
-#define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2)
-#define SYNTHVID_VERSION_WIN10 SYNTHVID_VERSION(3, 5)
-
-#define SYNTHVID_VER_GET_MAJOR(ver) (ver & 0x0000ffff)
-#define SYNTHVID_VER_GET_MINOR(ver) ((ver & 0xffff0000) >> 16)
-
-#define SYNTHVID_DEPTH_WIN8 32
-#define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024)
-
-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_RESOLUTION_REQUEST = 13,
- SYNTHVID_RESOLUTION_RESPONSE = 14,
-
- SYNTHVID_MAX = 15
-};
-
-#define SYNTHVID_EDID_BLOCK_SIZE 128
-#define SYNTHVID_MAX_RESOLUTION_COUNT 64
-
-struct hvd_screen_info {
- u16 width;
- u16 height;
-} __packed;
-
-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_supported_resolution_req {
- u8 maximum_resolution_count;
-} __packed;
-
-struct synthvid_supported_resolution_resp {
- u8 edid_block[SYNTHVID_EDID_BLOCK_SIZE];
- u8 resolution_count;
- u8 default_resolution_index;
- u8 is_standard;
- struct hvd_screen_info
- supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT];
-} __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;
- struct synthvid_supported_resolution_req resolution_req;
- struct synthvid_supported_resolution_resp resolution_resp;
- };
-} __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)
-#define HVFB_ONDEMAND_THROTTLE (HZ / 20)
-
-struct hvfb_par {
- struct fb_info *info;
- struct resource *mem;
- bool fb_ready; /* fb device is ready */
- struct completion wait;
- u32 synthvid_version;
-
- struct delayed_work dwork;
- bool update;
- bool update_saved; /* The value of 'update' before hibernation */
-
- u32 pseudo_palette[16];
- u8 init_buf[MAX_VMBUS_PKT_SIZE];
- u8 recv_buf[MAX_VMBUS_PKT_SIZE];
-
- /* If true, the VSC notifies the VSP on every framebuffer change */
- bool synchronous_fb;
-
- /* If true, need to copy from deferred IO mem to framebuffer mem */
- bool need_docopy;
-
- struct notifier_block hvfb_panic_nb;
-
- /* Memory for deferred IO and frame buffer itself */
- unsigned char *dio_vp;
- unsigned char *mmio_vp;
- phys_addr_t mmio_pp;
-
- /* Dirty rectangle, protected by delayed_refresh_lock */
- int x1, y1, x2, y2;
- bool delayed_refresh;
- spinlock_t delayed_refresh_lock;
-};
-
-static uint screen_width = HVFB_WIDTH;
-static uint screen_height = HVFB_HEIGHT;
-static uint screen_depth;
-static uint screen_fb_size;
-static uint dio_fb_size; /* FB size for deferred IO */
-
-static void hvfb_putmem(struct fb_info *info);
-
-/* 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_ratelimited("Unable to send packet via vmbus; error
%d\n", ret);
-
- 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, int x1, int y1, int x2, int y2)
-{
- struct hv_device *hdev = device_to_hv_device(info->device);
- struct synthvid_msg msg;
-
- memset(&msg, 0, sizeof(struct synthvid_msg));
- if (x2 == INT_MAX)
- x2 = info->var.xres;
- if (y2 == INT_MAX)
- y2 = info->var.yres;
-
- 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 = (x1 > x2) ? 0 : x1;
- msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;
- msg.dirt.rect[0].x2 =
- (x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;
- msg.dirt.rect[0].y2 =
- (y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;
-
- synthvid_send(hdev, &msg);
-
- return 0;
-}
-
-static void hvfb_docopy(struct hvfb_par *par,
- unsigned long offset,
- unsigned long size)
-{
- if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||
- size == 0 || offset >= dio_fb_size)
- return;
-
- if (offset + size > dio_fb_size)
- size = dio_fb_size - offset;
-
- memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);
-}
-
-/* Deferred IO callback */
-static void synthvid_deferred_io(struct fb_info *p, struct list_head
*pagereflist)
-{
- struct hvfb_par *par = p->par;
- struct fb_deferred_io_pageref *pageref;
- unsigned long start, end;
- int y1, y2, miny, maxy;
-
- miny = INT_MAX;
- maxy = 0;
-
- /*
- * Merge dirty pages. It is possible that last page cross
- * over the end of frame buffer row yres. This is taken care of
- * in synthvid_update function by clamping the y2
- * value to yres.
- */
- list_for_each_entry(pageref, pagereflist, list) {
- start = pageref->offset;
- end = start + PAGE_SIZE - 1;
- y1 = start / p->fix.line_length;
- y2 = end / p->fix.line_length;
- miny = min_t(int, miny, y1);
- maxy = max_t(int, maxy, y2);
-
- /* Copy from dio space to mmio address */
- if (par->fb_ready && par->need_docopy)
- hvfb_docopy(par, start, PAGE_SIZE);
- }
-
- if (par->fb_ready && par->update)
- synthvid_update(p, 0, miny, p->var.xres, maxy + 1);
-}
-
-static struct fb_deferred_io synthvid_defio = {
- .delay = HZ / 20,
- .deferred_io = synthvid_deferred_io,
-};
-
-/*
- * 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_RESOLUTION_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 if the ver1 version is equal or greater than ver2 */
-static inline bool synthvid_ver_ge(u32 ver1, u32 ver2)
-{
- if (SYNTHVID_VER_GET_MAJOR(ver1) > SYNTHVID_VER_GET_MAJOR(ver2) ||
- (SYNTHVID_VER_GET_MAJOR(ver1) == SYNTHVID_VER_GET_MAJOR(ver2) &&
- SYNTHVID_VER_GET_MINOR(ver1) >= SYNTHVID_VER_GET_MINOR(ver2)))
- return true;
-
- return false;
-}
-
-/* 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 ret = 0;
- unsigned long t;
-
- 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;
- pr_info("Synthvid Version major %d, minor %d\n",
- SYNTHVID_VER_GET_MAJOR(ver), SYNTHVID_VER_GET_MINOR(ver));
-
-out:
- return ret;
-}
-
-/* Get current resolution from the host */
-static int synthvid_get_supported_resolution(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 ret = 0;
- unsigned long t;
- u8 index;
-
- memset(msg, 0, sizeof(struct synthvid_msg));
- msg->vid_hdr.type = SYNTHVID_RESOLUTION_REQUEST;
- msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +
- sizeof(struct synthvid_supported_resolution_req);
-
- msg->resolution_req.maximum_resolution_count =
- SYNTHVID_MAX_RESOLUTION_COUNT;
- synthvid_send(hdev, msg);
-
- t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT);
- if (!t) {
- pr_err("Time out on waiting resolution response\n");
- ret = -ETIMEDOUT;
- goto out;
- }
-
- if (msg->resolution_resp.resolution_count == 0) {
- pr_err("No supported resolutions\n");
- ret = -ENODEV;
- goto out;
- }
-
- index = msg->resolution_resp.default_resolution_index;
- if (index >= msg->resolution_resp.resolution_count) {
- pr_err("Invalid resolution index: %d\n", index);
- ret = -ENODEV;
- goto out;
- }
-
- screen_width =
- msg->resolution_resp.supported_resolution[index].width;
- screen_height =
- msg->resolution_resp.supported_resolution[index].height;
-
-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 */
- switch (vmbus_proto_version) {
- case VERSION_WIN10:
- case VERSION_WIN10_V5:
- ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
- if (!ret)
- break;
- fallthrough;
- case VERSION_WIN8:
- case VERSION_WIN8_1:
- ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8);
- break;
- default:
- ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN10);
- break;
- }
-
- if (ret) {
- pr_err("Synthetic video device version not accepted\n");
- goto error;
- }
-
- screen_depth = SYNTHVID_DEPTH_WIN8;
- if (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10)) {
- ret = synthvid_get_supported_resolution(hdev);
- if (ret)
- pr_info("Failed to get supported resolution from host, use
default\n");
- }
-
- screen_fb_size = hdev->channel->offermsg.offer.
- mmio_megabytes * 1024 * 1024;
-
- 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 ret = 0;
- unsigned long t;
-
- /* 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 = par->mmio_pp;
- 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 != par->mmio_pp) {
- 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 scheduled to call whenever update request is received and it has
- * not been called in last HVFB_ONDEMAND_THROTTLE time interval.
- */
-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;
- unsigned long flags;
- int x1, x2, y1, y2;
- int j;
-
- spin_lock_irqsave(&par->delayed_refresh_lock, flags);
- /* Reset the request flag */
- par->delayed_refresh = false;
-
- /* Store the dirty rectangle to local variables */
- x1 = par->x1;
- x2 = par->x2;
- y1 = par->y1;
- y2 = par->y2;
-
- /* Clear dirty rectangle */
- par->x1 = par->y1 = INT_MAX;
- par->x2 = par->y2 = 0;
-
- spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
-
- if (x1 > info->var.xres || x2 > info->var.xres ||
- y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)
- return;
-
- /* Copy the dirty rectangle to frame buffer memory */
- if (par->need_docopy)
- for (j = y1; j < y2; j++)
- hvfb_docopy(par,
- j * info->fix.line_length +
- (x1 * screen_depth / 8),
- (x2 - x1) * screen_depth / 8);
-
- /* Refresh */
- if (par->fb_ready && par->update)
- synthvid_update(info, x1, y1, x2, y2);
-}
-
-/*
- * Control the on-demand refresh frequency. It schedules a delayed
- * screen update if it has not yet.
- */
-static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,
- int x1, int y1, int w, int h)
-{
- unsigned long flags;
- int x2 = x1 + w;
- int y2 = y1 + h;
-
- spin_lock_irqsave(&par->delayed_refresh_lock, flags);
-
- /* Merge dirty rectangle */
- par->x1 = min_t(int, par->x1, x1);
- par->y1 = min_t(int, par->y1, y1);
- par->x2 = max_t(int, par->x2, x2);
- par->y2 = max_t(int, par->y2, y2);
-
- /* Schedule a delayed screen update if not yet */
- if (par->delayed_refresh == false) {
- schedule_delayed_work(&par->dwork,
- HVFB_ONDEMAND_THROTTLE);
- par->delayed_refresh = true;
- }
-
- spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);
-}
-
-static int hvfb_on_panic(struct notifier_block *nb,
- unsigned long e, void *p)
-{
- struct hv_device *hdev;
- struct hvfb_par *par;
- struct fb_info *info;
-
- par = container_of(nb, struct hvfb_par, hvfb_panic_nb);
- info = par->info;
- hdev = device_to_hv_device(info->device);
-
- if (hv_ringbuffer_spinlock_busy(hdev->channel))
- return NOTIFY_DONE;
-
- par->synchronous_fb = true;
- if (par->need_docopy)
- hvfb_docopy(par, 0, dio_fb_size);
- synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
-
- return NOTIFY_DONE;
-}
-
-/* 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 int hvfb_blank(int blank, struct fb_info *info)
-{
- return 1; /* get fb_blank to set the colormap to all black */
-}
-
-static void hvfb_ops_damage_range(struct fb_info *info, off_t off, size_t len)
-{
- /* TODO: implement damage handling */
-}
-
-static void hvfb_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32
width, u32 height)
-{
- struct hvfb_par *par = info->par;
-
- if (par->synchronous_fb)
- synthvid_update(info, 0, 0, INT_MAX, INT_MAX);
- else
- hvfb_ondemand_refresh_throttle(par, x, y, width, height);
-}
-
-/*
- * fb_ops.fb_destroy is called by the last put_fb_info() call at the end
- * of unregister_framebuffer() or fb_release(). Do any cleanup related to
- * framebuffer here.
- */
-static void hvfb_destroy(struct fb_info *info)
-{
- hvfb_putmem(info);
- framebuffer_release(info);
-}
-
-/*
- * TODO: GEN1 codepaths allocate from system or DMA-able memory. Fix the
- * driver to use the _SYSMEM_ or _DMAMEM_ helpers in these cases.
- */
-FB_GEN_DEFAULT_DEFERRED_IOMEM_OPS(hvfb_ops,
- hvfb_ops_damage_range,
- hvfb_ops_damage_area)
-
-static const struct fb_ops hvfb_ops = {
- .owner = THIS_MODULE,
- FB_DEFAULT_DEFERRED_OPS(hvfb_ops),
- .fb_check_var = hvfb_check_var,
- .fb_set_par = hvfb_set_par,
- .fb_setcolreg = hvfb_setcolreg,
- .fb_blank = hvfb_blank,
- .fb_destroy = hvfb_destroy,
-};
-
-/* 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 ||
- (synthvid_ver_ge(par->synthvid_version, SYNTHVID_VERSION_WIN10) &&
- (x * y * screen_depth / 8 > screen_fb_size)) ||
- (par->synthvid_version == SYNTHVID_VERSION_WIN8 &&
- x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8)) {
- pr_err("Screen resolution option is out of range: skipped\n");
- return;
- }
-
- screen_width = x;
- screen_height = y;
- return;
-}
-
-/*
- * Allocate enough contiguous physical memory.
- * Return physical address if succeeded or -1 if failed.
- */
-static phys_addr_t hvfb_get_phymem(struct hv_device *hdev,
- unsigned int request_size)
-{
- struct page *page = NULL;
- dma_addr_t dma_handle;
- void *vmem;
- phys_addr_t paddr = 0;
- unsigned int order = get_order(request_size);
-
- if (request_size == 0)
- return -1;
-
- if (order <= MAX_PAGE_ORDER) {
- /* Call alloc_pages if the size is less than 2^MAX_PAGE_ORDER */
- page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
- if (!page)
- return -1;
-
- paddr = (page_to_pfn(page) << PAGE_SHIFT);
- } else {
- /* Allocate from CMA */
- hdev->device.coherent_dma_mask = DMA_BIT_MASK(64);
-
- vmem = dma_alloc_coherent(&hdev->device,
- round_up(request_size, PAGE_SIZE),
- &dma_handle,
- GFP_KERNEL | __GFP_NOWARN);
-
- if (!vmem)
- return -1;
-
- paddr = virt_to_phys(vmem);
- }
-
- return paddr;
-}
-
-/* Release contiguous physical memory */
-static void hvfb_release_phymem(struct device *device,
- phys_addr_t paddr, unsigned int size)
-{
- unsigned int order = get_order(size);
-
- if (order <= MAX_PAGE_ORDER)
- __free_pages(pfn_to_page(paddr >> PAGE_SHIFT), order);
- else
- dma_free_coherent(device,
- round_up(size, PAGE_SIZE),
- phys_to_virt(paddr),
- paddr);
-}
-
-
-/* Get framebuffer memory from Hyper-V video pci space */
-static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)
-{
- struct hvfb_par *par = info->par;
- struct pci_dev *pdev = NULL;
- void __iomem *fb_virt;
- int gen2vm = efi_enabled(EFI_BOOT);
- resource_size_t base = 0;
- resource_size_t size = 0;
- phys_addr_t paddr;
- int ret;
-
- if (!gen2vm) {
- 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;
- }
-
- base = pci_resource_start(pdev, 0);
- size = pci_resource_len(pdev, 0);
- aperture_remove_conflicting_devices(base, size, KBUILD_MODNAME);
-
- /*
- * For Gen 1 VM, we can directly use the contiguous memory
- * from VM. If we succeed, deferred IO happens directly
- * on this allocated framebuffer memory, avoiding extra
- * memory copy.
- */
- paddr = hvfb_get_phymem(hdev, screen_fb_size);
- if (paddr != (phys_addr_t) -1) {
- par->mmio_pp = paddr;
- par->mmio_vp = par->dio_vp = __va(paddr);
-
- info->fix.smem_start = paddr;
- info->fix.smem_len = screen_fb_size;
- info->screen_base = par->mmio_vp;
- info->screen_size = screen_fb_size;
-
- par->need_docopy = false;
- goto getmem_done;
- }
- pr_info("Unable to allocate enough contiguous physical memory on Gen
1 VM. Using MMIO instead.\n");
- } else {
- aperture_remove_all_conflicting_devices(KBUILD_MODNAME);
- }
-
- /*
- * Cannot use contiguous physical memory, so allocate MMIO space for
- * the framebuffer. At this point in the function, conflicting devices
- * that might have claimed the framebuffer MMIO space based on
- * screen_info.lfb_base must have already been removed so that
- * vmbus_allocate_mmio() does not allocate different MMIO space. If the
- * kdump image were to be loaded using kexec_file_load(), the
- * framebuffer location in the kdump image would be set from
- * screen_info.lfb_base at the time that kdump is enabled. If the
- * framebuffer has moved elsewhere, this could be the wrong location,
- * causing kdump to hang when efifb (for example) loads.
- */
- dio_fb_size =
- screen_width * screen_height * screen_depth / 8;
-
- ret = vmbus_allocate_mmio(&par->mem, hdev, 0, -1,
- screen_fb_size, 0x100000, true);
- if (ret != 0) {
- pr_err("Unable to allocate framebuffer memory\n");
- goto err1;
- }
-
- /*
- * Map the VRAM cacheable for performance. This is also required for
- * VM Connect to display properly for ARM64 Linux VM, as the host also
- * maps the VRAM cacheable.
- */
- fb_virt = ioremap_cache(par->mem->start, screen_fb_size);
- if (!fb_virt)
- goto err2;
-
- /* Allocate memory for deferred IO */
- par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));
- if (par->dio_vp == NULL)
- goto err3;
-
- /* Physical address of FB device */
- par->mmio_pp = par->mem->start;
- /* Virtual address of FB device */
- par->mmio_vp = (unsigned char *) fb_virt;
-
- info->fix.smem_start = par->mem->start;
- info->fix.smem_len = dio_fb_size;
- info->screen_base = par->dio_vp;
- info->screen_size = dio_fb_size;
-
-getmem_done:
- if (!gen2vm)
- pci_dev_put(pdev);
-
- return 0;
-
-err3:
- iounmap(fb_virt);
-err2:
- vmbus_free_mmio(par->mem->start, screen_fb_size);
- par->mem = NULL;
-err1:
- if (!gen2vm)
- pci_dev_put(pdev);
-
- return -ENOMEM;
-}
-
-/* Release the framebuffer */
-static void hvfb_putmem(struct fb_info *info)
-{
- struct hvfb_par *par = info->par;
-
- if (par->need_docopy) {
- vfree(par->dio_vp);
- iounmap(par->mmio_vp);
- vmbus_free_mmio(par->mem->start, screen_fb_size);
- } else {
- hvfb_release_phymem(info->device, info->fix.smem_start,
- screen_fb_size);
- }
-
- par->mem = NULL;
-}
-
-
-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)
- return -ENOMEM;
-
- par = info->par;
- par->info = info;
- par->fb_ready = false;
- par->need_docopy = true;
- init_completion(&par->wait);
- INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);
-
- par->delayed_refresh = false;
- spin_lock_init(&par->delayed_refresh_lock);
- par->x1 = par->y1 = INT_MAX;
- par->x2 = par->y2 = 0;
-
- /* 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;
- }
-
- hvfb_get_option(info);
- pr_info("Screen resolution: %dx%d, Color depth: %d, Frame buffer size:
%d\n",
- screen_width, screen_height, screen_depth, screen_fb_size);
-
- ret = hvfb_getmem(hdev, info);
- if (ret) {
- pr_err("No memory for framebuffer\n");
- goto error2;
- }
-
- /* Set up fb_info */
- 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;
-
- /* Initialize deferred IO */
- info->fbdefio = &synthvid_defio;
- fb_deferred_io_init(info);
-
- /* Send config to host */
- ret = synthvid_send_config(hdev);
- if (ret)
- goto error;
-
- ret = devm_register_framebuffer(&hdev->device, info);
- if (ret) {
- pr_err("Unable to register framebuffer\n");
- goto error;
- }
-
- par->fb_ready = true;
-
- par->synchronous_fb = false;
-
- /*
- * We need to be sure this panic notifier runs _before_ the
- * vmbus disconnect, so order it by priority. It must execute
- * before the function hv_panic_vmbus_unload() [drivers/hv/vmbus_drv.c],
- * which is almost at the end of list, with priority = INT_MIN + 1.
- */
- par->hvfb_panic_nb.notifier_call = hvfb_on_panic;
- par->hvfb_panic_nb.priority = INT_MIN + 10;
- atomic_notifier_chain_register(&panic_notifier_list,
- &par->hvfb_panic_nb);
-
- return 0;
-
-error:
- fb_deferred_io_cleanup(info);
- 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 void hvfb_remove(struct hv_device *hdev)
-{
- struct fb_info *info = hv_get_drvdata(hdev);
- struct hvfb_par *par = info->par;
-
- atomic_notifier_chain_unregister(&panic_notifier_list,
- &par->hvfb_panic_nb);
-
- par->update = false;
- par->fb_ready = false;
-
- fb_deferred_io_cleanup(info);
-
- cancel_delayed_work_sync(&par->dwork);
-
- vmbus_close(hdev->channel);
- hv_set_drvdata(hdev, NULL);
-}
-
-static int hvfb_suspend(struct hv_device *hdev)
-{
- struct fb_info *info = hv_get_drvdata(hdev);
- struct hvfb_par *par = info->par;
-
- console_lock();
-
- /* 1 means do suspend */
- fb_set_suspend(info, 1);
-
- cancel_delayed_work_sync(&par->dwork);
- cancel_delayed_work_sync(&info->deferred_work);
-
- par->update_saved = par->update;
- par->update = false;
- par->fb_ready = false;
-
- vmbus_close(hdev->channel);
-
- console_unlock();
-
- return 0;
-}
-
-static int hvfb_resume(struct hv_device *hdev)
-{
- struct fb_info *info = hv_get_drvdata(hdev);
- struct hvfb_par *par = info->par;
- int ret;
-
- console_lock();
-
- ret = synthvid_connect_vsp(hdev);
- if (ret != 0)
- goto out;
-
- ret = synthvid_send_config(hdev);
- if (ret != 0) {
- vmbus_close(hdev->channel);
- goto out;
- }
-
- par->fb_ready = true;
- par->update = par->update_saved;
-
- schedule_delayed_work(&info->deferred_work, info->fbdefio->delay);
- schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
-
- /* 0 means do resume */
- fb_set_suspend(info, 0);
-
-out:
- console_unlock();
-
- return ret;
-}
-
-
-static const struct pci_device_id pci_stub_id_table[] = {
- {
- .vendor = PCI_VENDOR_ID_MICROSOFT,
- .device = PCI_DEVICE_ID_HYPERV_VIDEO,
- },
- { /* end of list */ }
-};
-
-static const struct hv_vmbus_device_id id_table[] = {
- /* Synthetic Video Device GUID */
- {HV_SYNTHVID_GUID},
- {}
-};
-
-MODULE_DEVICE_TABLE(pci, pci_stub_id_table);
-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,
- .suspend = hvfb_suspend,
- .resume = hvfb_resume,
- .driver = {
- .probe_type = PROBE_PREFER_ASYNCHRONOUS,
- },
-};
-
-static int hvfb_pci_stub_probe(struct pci_dev *pdev,
- const struct pci_device_id *ent)
-{
- return 0;
-}
-
-static void hvfb_pci_stub_remove(struct pci_dev *pdev)
-{
-}
-
-static struct pci_driver hvfb_pci_stub_driver = {
- .name = KBUILD_MODNAME,
- .id_table = pci_stub_id_table,
- .probe = hvfb_pci_stub_probe,
- .remove = hvfb_pci_stub_remove,
- .driver = {
- .probe_type = PROBE_PREFER_ASYNCHRONOUS,
- }
-};
-
-static int __init hvfb_drv_init(void)
-{
- int ret;
-
- if (fb_modesetting_disabled("hyper_fb"))
- return -ENODEV;
-
- ret = vmbus_driver_register(&hvfb_drv);
- if (ret != 0)
- return ret;
-
- ret = pci_register_driver(&hvfb_pci_stub_driver);
- if (ret != 0) {
- vmbus_driver_unregister(&hvfb_drv);
- return ret;
- }
-
- return 0;
-}
-
-static void __exit hvfb_drv_exit(void)
-{
- pci_unregister_driver(&hvfb_pci_stub_driver);
- vmbus_driver_unregister(&hvfb_drv);
-}
-
-module_init(hvfb_drv_init);
-module_exit(hvfb_drv_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver");
