// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2012, Microsoft Corporation. * * Author: * Haiyang Zhang <haiyangz@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 */ /* 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 intsynthvid_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;Lines 1–500 of 1397. 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// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2012, Microsoft Corporation. * * Author: * Haiyang Zhang <haiyangz@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 */ /* 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;