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/*
* 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(struc
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