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68a2d20b HZ |
1 | /* |
2 | * Copyright (c) 2012, Microsoft Corporation. | |
3 | * | |
4 | * Author: | |
5 | * Haiyang Zhang <haiyangz@microsoft.com> | |
6 | * | |
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. | |
10 | * | |
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 | |
15 | * details. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Hyper-V Synthetic Video Frame Buffer Driver | |
20 | * | |
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 | |
24 | * or earlier. | |
25 | * | |
26 | * It also solves the double mouse cursor issue of the emulated video mode. | |
27 | * | |
28 | * The default screen resolution is 1152x864, which may be changed by a | |
29 | * kernel parameter: | |
30 | * video=hyperv_fb:<width>x<height> | |
31 | * For example: video=hyperv_fb:1280x1024 | |
32 | * | |
33 | * Portrait orientation is also supported: | |
34 | * For example: video=hyperv_fb:864x1152 | |
35 | */ | |
36 | ||
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
38 | ||
39 | #include <linux/module.h> | |
40 | #include <linux/kernel.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/completion.h> | |
43 | #include <linux/fb.h> | |
44 | #include <linux/pci.h> | |
45 | ||
46 | #include <linux/hyperv.h> | |
47 | ||
48 | ||
49 | /* Hyper-V Synthetic Video Protocol definitions and structures */ | |
50 | #define MAX_VMBUS_PKT_SIZE 0x4000 | |
51 | ||
52 | #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major)) | |
53 | #define SYNTHVID_VERSION_WIN7 SYNTHVID_VERSION(3, 0) | |
54 | #define SYNTHVID_VERSION_WIN8 SYNTHVID_VERSION(3, 2) | |
55 | ||
56 | #define SYNTHVID_DEPTH_WIN7 16 | |
57 | #define SYNTHVID_DEPTH_WIN8 32 | |
58 | ||
59 | #define SYNTHVID_FB_SIZE_WIN7 (4 * 1024 * 1024) | |
60 | #define SYNTHVID_WIDTH_MAX_WIN7 1600 | |
61 | #define SYNTHVID_HEIGHT_MAX_WIN7 1200 | |
62 | ||
63 | #define SYNTHVID_FB_SIZE_WIN8 (8 * 1024 * 1024) | |
64 | ||
65 | #define PCI_VENDOR_ID_MICROSOFT 0x1414 | |
66 | #define PCI_DEVICE_ID_HYPERV_VIDEO 0x5353 | |
67 | ||
68 | ||
69 | enum pipe_msg_type { | |
70 | PIPE_MSG_INVALID, | |
71 | PIPE_MSG_DATA, | |
72 | PIPE_MSG_MAX | |
73 | }; | |
74 | ||
75 | struct pipe_msg_hdr { | |
76 | u32 type; | |
77 | u32 size; /* size of message after this field */ | |
78 | } __packed; | |
79 | ||
80 | ||
81 | enum synthvid_msg_type { | |
82 | SYNTHVID_ERROR = 0, | |
83 | SYNTHVID_VERSION_REQUEST = 1, | |
84 | SYNTHVID_VERSION_RESPONSE = 2, | |
85 | SYNTHVID_VRAM_LOCATION = 3, | |
86 | SYNTHVID_VRAM_LOCATION_ACK = 4, | |
87 | SYNTHVID_SITUATION_UPDATE = 5, | |
88 | SYNTHVID_SITUATION_UPDATE_ACK = 6, | |
89 | SYNTHVID_POINTER_POSITION = 7, | |
90 | SYNTHVID_POINTER_SHAPE = 8, | |
91 | SYNTHVID_FEATURE_CHANGE = 9, | |
92 | SYNTHVID_DIRT = 10, | |
93 | ||
94 | SYNTHVID_MAX = 11 | |
95 | }; | |
96 | ||
97 | struct synthvid_msg_hdr { | |
98 | u32 type; | |
99 | u32 size; /* size of this header + payload after this field*/ | |
100 | } __packed; | |
101 | ||
102 | ||
103 | struct synthvid_version_req { | |
104 | u32 version; | |
105 | } __packed; | |
106 | ||
107 | struct synthvid_version_resp { | |
108 | u32 version; | |
109 | u8 is_accepted; | |
110 | u8 max_video_outputs; | |
111 | } __packed; | |
112 | ||
113 | struct synthvid_vram_location { | |
114 | u64 user_ctx; | |
115 | u8 is_vram_gpa_specified; | |
116 | u64 vram_gpa; | |
117 | } __packed; | |
118 | ||
119 | struct synthvid_vram_location_ack { | |
120 | u64 user_ctx; | |
121 | } __packed; | |
122 | ||
123 | struct video_output_situation { | |
124 | u8 active; | |
125 | u32 vram_offset; | |
126 | u8 depth_bits; | |
127 | u32 width_pixels; | |
128 | u32 height_pixels; | |
129 | u32 pitch_bytes; | |
130 | } __packed; | |
131 | ||
132 | struct synthvid_situation_update { | |
133 | u64 user_ctx; | |
134 | u8 video_output_count; | |
135 | struct video_output_situation video_output[1]; | |
136 | } __packed; | |
137 | ||
138 | struct synthvid_situation_update_ack { | |
139 | u64 user_ctx; | |
140 | } __packed; | |
141 | ||
142 | struct synthvid_pointer_position { | |
143 | u8 is_visible; | |
144 | u8 video_output; | |
145 | s32 image_x; | |
146 | s32 image_y; | |
147 | } __packed; | |
148 | ||
149 | ||
150 | #define CURSOR_MAX_X 96 | |
151 | #define CURSOR_MAX_Y 96 | |
152 | #define CURSOR_ARGB_PIXEL_SIZE 4 | |
153 | #define CURSOR_MAX_SIZE (CURSOR_MAX_X * CURSOR_MAX_Y * CURSOR_ARGB_PIXEL_SIZE) | |
154 | #define CURSOR_COMPLETE (-1) | |
155 | ||
156 | struct synthvid_pointer_shape { | |
157 | u8 part_idx; | |
158 | u8 is_argb; | |
159 | u32 width; /* CURSOR_MAX_X at most */ | |
160 | u32 height; /* CURSOR_MAX_Y at most */ | |
161 | u32 hot_x; /* hotspot relative to upper-left of pointer image */ | |
162 | u32 hot_y; | |
163 | u8 data[4]; | |
164 | } __packed; | |
165 | ||
166 | struct synthvid_feature_change { | |
167 | u8 is_dirt_needed; | |
168 | u8 is_ptr_pos_needed; | |
169 | u8 is_ptr_shape_needed; | |
170 | u8 is_situ_needed; | |
171 | } __packed; | |
172 | ||
173 | struct rect { | |
174 | s32 x1, y1; /* top left corner */ | |
175 | s32 x2, y2; /* bottom right corner, exclusive */ | |
176 | } __packed; | |
177 | ||
178 | struct synthvid_dirt { | |
179 | u8 video_output; | |
180 | u8 dirt_count; | |
181 | struct rect rect[1]; | |
182 | } __packed; | |
183 | ||
184 | struct synthvid_msg { | |
185 | struct pipe_msg_hdr pipe_hdr; | |
186 | struct synthvid_msg_hdr vid_hdr; | |
187 | union { | |
188 | struct synthvid_version_req ver_req; | |
189 | struct synthvid_version_resp ver_resp; | |
190 | struct synthvid_vram_location vram; | |
191 | struct synthvid_vram_location_ack vram_ack; | |
192 | struct synthvid_situation_update situ; | |
193 | struct synthvid_situation_update_ack situ_ack; | |
194 | struct synthvid_pointer_position ptr_pos; | |
195 | struct synthvid_pointer_shape ptr_shape; | |
196 | struct synthvid_feature_change feature_chg; | |
197 | struct synthvid_dirt dirt; | |
198 | }; | |
199 | } __packed; | |
200 | ||
201 | ||
202 | ||
203 | /* FB driver definitions and structures */ | |
204 | #define HVFB_WIDTH 1152 /* default screen width */ | |
205 | #define HVFB_HEIGHT 864 /* default screen height */ | |
206 | #define HVFB_WIDTH_MIN 640 | |
207 | #define HVFB_HEIGHT_MIN 480 | |
208 | ||
209 | #define RING_BUFSIZE (256 * 1024) | |
210 | #define VSP_TIMEOUT (10 * HZ) | |
211 | #define HVFB_UPDATE_DELAY (HZ / 20) | |
212 | ||
213 | struct hvfb_par { | |
214 | struct fb_info *info; | |
215 | bool fb_ready; /* fb device is ready */ | |
216 | struct completion wait; | |
217 | u32 synthvid_version; | |
218 | ||
219 | struct delayed_work dwork; | |
220 | bool update; | |
221 | ||
222 | u32 pseudo_palette[16]; | |
223 | u8 init_buf[MAX_VMBUS_PKT_SIZE]; | |
224 | u8 recv_buf[MAX_VMBUS_PKT_SIZE]; | |
225 | }; | |
226 | ||
227 | static uint screen_width = HVFB_WIDTH; | |
228 | static uint screen_height = HVFB_HEIGHT; | |
229 | static uint screen_depth; | |
230 | static uint screen_fb_size; | |
231 | ||
232 | /* Send message to Hyper-V host */ | |
233 | static inline int synthvid_send(struct hv_device *hdev, | |
234 | struct synthvid_msg *msg) | |
235 | { | |
236 | static atomic64_t request_id = ATOMIC64_INIT(0); | |
237 | int ret; | |
238 | ||
239 | msg->pipe_hdr.type = PIPE_MSG_DATA; | |
240 | msg->pipe_hdr.size = msg->vid_hdr.size; | |
241 | ||
242 | ret = vmbus_sendpacket(hdev->channel, msg, | |
243 | msg->vid_hdr.size + sizeof(struct pipe_msg_hdr), | |
244 | atomic64_inc_return(&request_id), | |
245 | VM_PKT_DATA_INBAND, 0); | |
246 | ||
247 | if (ret) | |
248 | pr_err("Unable to send packet via vmbus\n"); | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | ||
254 | /* Send screen resolution info to host */ | |
255 | static int synthvid_send_situ(struct hv_device *hdev) | |
256 | { | |
257 | struct fb_info *info = hv_get_drvdata(hdev); | |
258 | struct synthvid_msg msg; | |
259 | ||
260 | if (!info) | |
261 | return -ENODEV; | |
262 | ||
263 | memset(&msg, 0, sizeof(struct synthvid_msg)); | |
264 | ||
265 | msg.vid_hdr.type = SYNTHVID_SITUATION_UPDATE; | |
266 | msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + | |
267 | sizeof(struct synthvid_situation_update); | |
268 | msg.situ.user_ctx = 0; | |
269 | msg.situ.video_output_count = 1; | |
270 | msg.situ.video_output[0].active = 1; | |
271 | msg.situ.video_output[0].vram_offset = 0; | |
272 | msg.situ.video_output[0].depth_bits = info->var.bits_per_pixel; | |
273 | msg.situ.video_output[0].width_pixels = info->var.xres; | |
274 | msg.situ.video_output[0].height_pixels = info->var.yres; | |
275 | msg.situ.video_output[0].pitch_bytes = info->fix.line_length; | |
276 | ||
277 | synthvid_send(hdev, &msg); | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
282 | /* Send mouse pointer info to host */ | |
283 | static int synthvid_send_ptr(struct hv_device *hdev) | |
284 | { | |
285 | struct synthvid_msg msg; | |
286 | ||
287 | memset(&msg, 0, sizeof(struct synthvid_msg)); | |
288 | msg.vid_hdr.type = SYNTHVID_POINTER_POSITION; | |
289 | msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + | |
290 | sizeof(struct synthvid_pointer_position); | |
291 | msg.ptr_pos.is_visible = 1; | |
292 | msg.ptr_pos.video_output = 0; | |
293 | msg.ptr_pos.image_x = 0; | |
294 | msg.ptr_pos.image_y = 0; | |
295 | synthvid_send(hdev, &msg); | |
296 | ||
297 | memset(&msg, 0, sizeof(struct synthvid_msg)); | |
298 | msg.vid_hdr.type = SYNTHVID_POINTER_SHAPE; | |
299 | msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + | |
300 | sizeof(struct synthvid_pointer_shape); | |
301 | msg.ptr_shape.part_idx = CURSOR_COMPLETE; | |
302 | msg.ptr_shape.is_argb = 1; | |
303 | msg.ptr_shape.width = 1; | |
304 | msg.ptr_shape.height = 1; | |
305 | msg.ptr_shape.hot_x = 0; | |
306 | msg.ptr_shape.hot_y = 0; | |
307 | msg.ptr_shape.data[0] = 0; | |
308 | msg.ptr_shape.data[1] = 1; | |
309 | msg.ptr_shape.data[2] = 1; | |
310 | msg.ptr_shape.data[3] = 1; | |
311 | synthvid_send(hdev, &msg); | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | /* Send updated screen area (dirty rectangle) location to host */ | |
317 | static int synthvid_update(struct fb_info *info) | |
318 | { | |
319 | struct hv_device *hdev = device_to_hv_device(info->device); | |
320 | struct synthvid_msg msg; | |
321 | ||
322 | memset(&msg, 0, sizeof(struct synthvid_msg)); | |
323 | ||
324 | msg.vid_hdr.type = SYNTHVID_DIRT; | |
325 | msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) + | |
326 | sizeof(struct synthvid_dirt); | |
327 | msg.dirt.video_output = 0; | |
328 | msg.dirt.dirt_count = 1; | |
329 | msg.dirt.rect[0].x1 = 0; | |
330 | msg.dirt.rect[0].y1 = 0; | |
331 | msg.dirt.rect[0].x2 = info->var.xres; | |
332 | msg.dirt.rect[0].y2 = info->var.yres; | |
333 | ||
334 | synthvid_send(hdev, &msg); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | ||
340 | /* | |
341 | * Actions on received messages from host: | |
342 | * Complete the wait event. | |
343 | * Or, reply with screen and cursor info. | |
344 | */ | |
345 | static void synthvid_recv_sub(struct hv_device *hdev) | |
346 | { | |
347 | struct fb_info *info = hv_get_drvdata(hdev); | |
348 | struct hvfb_par *par; | |
349 | struct synthvid_msg *msg; | |
350 | ||
351 | if (!info) | |
352 | return; | |
353 | ||
354 | par = info->par; | |
355 | msg = (struct synthvid_msg *)par->recv_buf; | |
356 | ||
357 | /* Complete the wait event */ | |
358 | if (msg->vid_hdr.type == SYNTHVID_VERSION_RESPONSE || | |
359 | msg->vid_hdr.type == SYNTHVID_VRAM_LOCATION_ACK) { | |
360 | memcpy(par->init_buf, msg, MAX_VMBUS_PKT_SIZE); | |
361 | complete(&par->wait); | |
362 | return; | |
363 | } | |
364 | ||
365 | /* Reply with screen and cursor info */ | |
366 | if (msg->vid_hdr.type == SYNTHVID_FEATURE_CHANGE) { | |
367 | if (par->fb_ready) { | |
368 | synthvid_send_ptr(hdev); | |
369 | synthvid_send_situ(hdev); | |
370 | } | |
371 | ||
372 | par->update = msg->feature_chg.is_dirt_needed; | |
373 | if (par->update) | |
374 | schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); | |
375 | } | |
376 | } | |
377 | ||
378 | /* Receive callback for messages from the host */ | |
379 | static void synthvid_receive(void *ctx) | |
380 | { | |
381 | struct hv_device *hdev = ctx; | |
382 | struct fb_info *info = hv_get_drvdata(hdev); | |
383 | struct hvfb_par *par; | |
384 | struct synthvid_msg *recv_buf; | |
385 | u32 bytes_recvd; | |
386 | u64 req_id; | |
387 | int ret; | |
388 | ||
389 | if (!info) | |
390 | return; | |
391 | ||
392 | par = info->par; | |
393 | recv_buf = (struct synthvid_msg *)par->recv_buf; | |
394 | ||
395 | do { | |
396 | ret = vmbus_recvpacket(hdev->channel, recv_buf, | |
397 | MAX_VMBUS_PKT_SIZE, | |
398 | &bytes_recvd, &req_id); | |
399 | if (bytes_recvd > 0 && | |
400 | recv_buf->pipe_hdr.type == PIPE_MSG_DATA) | |
401 | synthvid_recv_sub(hdev); | |
402 | } while (bytes_recvd > 0 && ret == 0); | |
403 | } | |
404 | ||
405 | /* Check synthetic video protocol version with the host */ | |
406 | static int synthvid_negotiate_ver(struct hv_device *hdev, u32 ver) | |
407 | { | |
408 | struct fb_info *info = hv_get_drvdata(hdev); | |
409 | struct hvfb_par *par = info->par; | |
410 | struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; | |
411 | int t, ret = 0; | |
412 | ||
413 | memset(msg, 0, sizeof(struct synthvid_msg)); | |
414 | msg->vid_hdr.type = SYNTHVID_VERSION_REQUEST; | |
415 | msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + | |
416 | sizeof(struct synthvid_version_req); | |
417 | msg->ver_req.version = ver; | |
418 | synthvid_send(hdev, msg); | |
419 | ||
420 | t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); | |
421 | if (!t) { | |
422 | pr_err("Time out on waiting version response\n"); | |
423 | ret = -ETIMEDOUT; | |
424 | goto out; | |
425 | } | |
426 | if (!msg->ver_resp.is_accepted) { | |
427 | ret = -ENODEV; | |
428 | goto out; | |
429 | } | |
430 | ||
431 | par->synthvid_version = ver; | |
432 | ||
433 | out: | |
434 | return ret; | |
435 | } | |
436 | ||
437 | /* Connect to VSP (Virtual Service Provider) on host */ | |
438 | static int synthvid_connect_vsp(struct hv_device *hdev) | |
439 | { | |
440 | struct fb_info *info = hv_get_drvdata(hdev); | |
441 | struct hvfb_par *par = info->par; | |
442 | int ret; | |
443 | ||
444 | ret = vmbus_open(hdev->channel, RING_BUFSIZE, RING_BUFSIZE, | |
445 | NULL, 0, synthvid_receive, hdev); | |
446 | if (ret) { | |
447 | pr_err("Unable to open vmbus channel\n"); | |
448 | return ret; | |
449 | } | |
450 | ||
451 | /* Negotiate the protocol version with host */ | |
452 | if (vmbus_proto_version == VERSION_WS2008 || | |
453 | vmbus_proto_version == VERSION_WIN7) | |
454 | ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN7); | |
455 | else | |
456 | ret = synthvid_negotiate_ver(hdev, SYNTHVID_VERSION_WIN8); | |
457 | ||
458 | if (ret) { | |
459 | pr_err("Synthetic video device version not accepted\n"); | |
460 | goto error; | |
461 | } | |
462 | ||
463 | if (par->synthvid_version == SYNTHVID_VERSION_WIN7) { | |
464 | screen_depth = SYNTHVID_DEPTH_WIN7; | |
465 | screen_fb_size = SYNTHVID_FB_SIZE_WIN7; | |
466 | } else { | |
467 | screen_depth = SYNTHVID_DEPTH_WIN8; | |
468 | screen_fb_size = SYNTHVID_FB_SIZE_WIN8; | |
469 | } | |
470 | ||
471 | return 0; | |
472 | ||
473 | error: | |
474 | vmbus_close(hdev->channel); | |
475 | return ret; | |
476 | } | |
477 | ||
478 | /* Send VRAM and Situation messages to the host */ | |
479 | static int synthvid_send_config(struct hv_device *hdev) | |
480 | { | |
481 | struct fb_info *info = hv_get_drvdata(hdev); | |
482 | struct hvfb_par *par = info->par; | |
483 | struct synthvid_msg *msg = (struct synthvid_msg *)par->init_buf; | |
484 | int t, ret = 0; | |
485 | ||
486 | /* Send VRAM location */ | |
487 | memset(msg, 0, sizeof(struct synthvid_msg)); | |
488 | msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION; | |
489 | msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) + | |
490 | sizeof(struct synthvid_vram_location); | |
491 | msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start; | |
492 | msg->vram.is_vram_gpa_specified = 1; | |
493 | synthvid_send(hdev, msg); | |
494 | ||
495 | t = wait_for_completion_timeout(&par->wait, VSP_TIMEOUT); | |
496 | if (!t) { | |
497 | pr_err("Time out on waiting vram location ack\n"); | |
498 | ret = -ETIMEDOUT; | |
499 | goto out; | |
500 | } | |
501 | if (msg->vram_ack.user_ctx != info->fix.smem_start) { | |
502 | pr_err("Unable to set VRAM location\n"); | |
503 | ret = -ENODEV; | |
504 | goto out; | |
505 | } | |
506 | ||
507 | /* Send pointer and situation update */ | |
508 | synthvid_send_ptr(hdev); | |
509 | synthvid_send_situ(hdev); | |
510 | ||
511 | out: | |
512 | return ret; | |
513 | } | |
514 | ||
515 | ||
516 | /* | |
517 | * Delayed work callback: | |
518 | * It is called at HVFB_UPDATE_DELAY or longer time interval to process | |
519 | * screen updates. It is re-scheduled if further update is necessary. | |
520 | */ | |
521 | static void hvfb_update_work(struct work_struct *w) | |
522 | { | |
523 | struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work); | |
524 | struct fb_info *info = par->info; | |
525 | ||
526 | if (par->fb_ready) | |
527 | synthvid_update(info); | |
528 | ||
529 | if (par->update) | |
530 | schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY); | |
531 | } | |
532 | ||
533 | ||
534 | /* Framebuffer operation handlers */ | |
535 | ||
536 | static int hvfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) | |
537 | { | |
538 | if (var->xres < HVFB_WIDTH_MIN || var->yres < HVFB_HEIGHT_MIN || | |
539 | var->xres > screen_width || var->yres > screen_height || | |
540 | var->bits_per_pixel != screen_depth) | |
541 | return -EINVAL; | |
542 | ||
543 | var->xres_virtual = var->xres; | |
544 | var->yres_virtual = var->yres; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static int hvfb_set_par(struct fb_info *info) | |
550 | { | |
551 | struct hv_device *hdev = device_to_hv_device(info->device); | |
552 | ||
553 | return synthvid_send_situ(hdev); | |
554 | } | |
555 | ||
556 | ||
557 | static inline u32 chan_to_field(u32 chan, struct fb_bitfield *bf) | |
558 | { | |
559 | return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; | |
560 | } | |
561 | ||
562 | static int hvfb_setcolreg(unsigned regno, unsigned red, unsigned green, | |
563 | unsigned blue, unsigned transp, struct fb_info *info) | |
564 | { | |
565 | u32 *pal = info->pseudo_palette; | |
566 | ||
567 | if (regno > 15) | |
568 | return -EINVAL; | |
569 | ||
570 | pal[regno] = chan_to_field(red, &info->var.red) | |
571 | | chan_to_field(green, &info->var.green) | |
572 | | chan_to_field(blue, &info->var.blue) | |
573 | | chan_to_field(transp, &info->var.transp); | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | ||
579 | static struct fb_ops hvfb_ops = { | |
580 | .owner = THIS_MODULE, | |
581 | .fb_check_var = hvfb_check_var, | |
582 | .fb_set_par = hvfb_set_par, | |
583 | .fb_setcolreg = hvfb_setcolreg, | |
584 | .fb_fillrect = cfb_fillrect, | |
585 | .fb_copyarea = cfb_copyarea, | |
586 | .fb_imageblit = cfb_imageblit, | |
587 | }; | |
588 | ||
589 | ||
590 | /* Get options from kernel paramenter "video=" */ | |
591 | static void hvfb_get_option(struct fb_info *info) | |
592 | { | |
593 | struct hvfb_par *par = info->par; | |
594 | char *opt = NULL, *p; | |
595 | uint x = 0, y = 0; | |
596 | ||
597 | if (fb_get_options(KBUILD_MODNAME, &opt) || !opt || !*opt) | |
598 | return; | |
599 | ||
600 | p = strsep(&opt, "x"); | |
601 | if (!*p || kstrtouint(p, 0, &x) || | |
602 | !opt || !*opt || kstrtouint(opt, 0, &y)) { | |
603 | pr_err("Screen option is invalid: skipped\n"); | |
604 | return; | |
605 | } | |
606 | ||
607 | if (x < HVFB_WIDTH_MIN || y < HVFB_HEIGHT_MIN || | |
608 | (par->synthvid_version == SYNTHVID_VERSION_WIN8 && | |
609 | x * y * screen_depth / 8 > SYNTHVID_FB_SIZE_WIN8) || | |
610 | (par->synthvid_version == SYNTHVID_VERSION_WIN7 && | |
611 | (x > SYNTHVID_WIDTH_MAX_WIN7 || y > SYNTHVID_HEIGHT_MAX_WIN7))) { | |
612 | pr_err("Screen resolution option is out of range: skipped\n"); | |
613 | return; | |
614 | } | |
615 | ||
616 | screen_width = x; | |
617 | screen_height = y; | |
618 | return; | |
619 | } | |
620 | ||
621 | ||
622 | /* Get framebuffer memory from Hyper-V video pci space */ | |
623 | static int hvfb_getmem(struct fb_info *info) | |
624 | { | |
625 | struct pci_dev *pdev; | |
626 | ulong fb_phys; | |
627 | void __iomem *fb_virt; | |
628 | ||
629 | pdev = pci_get_device(PCI_VENDOR_ID_MICROSOFT, | |
630 | PCI_DEVICE_ID_HYPERV_VIDEO, NULL); | |
631 | if (!pdev) { | |
632 | pr_err("Unable to find PCI Hyper-V video\n"); | |
633 | return -ENODEV; | |
634 | } | |
635 | ||
636 | if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM) || | |
637 | pci_resource_len(pdev, 0) < screen_fb_size) | |
638 | goto err1; | |
639 | ||
640 | fb_phys = pci_resource_end(pdev, 0) - screen_fb_size + 1; | |
641 | if (!request_mem_region(fb_phys, screen_fb_size, KBUILD_MODNAME)) | |
642 | goto err1; | |
643 | ||
644 | fb_virt = ioremap(fb_phys, screen_fb_size); | |
645 | if (!fb_virt) | |
646 | goto err2; | |
647 | ||
648 | info->apertures = alloc_apertures(1); | |
649 | if (!info->apertures) | |
650 | goto err3; | |
651 | ||
652 | info->apertures->ranges[0].base = pci_resource_start(pdev, 0); | |
653 | info->apertures->ranges[0].size = pci_resource_len(pdev, 0); | |
654 | info->fix.smem_start = fb_phys; | |
655 | info->fix.smem_len = screen_fb_size; | |
656 | info->screen_base = fb_virt; | |
657 | info->screen_size = screen_fb_size; | |
658 | ||
659 | pci_dev_put(pdev); | |
660 | return 0; | |
661 | ||
662 | err3: | |
663 | iounmap(fb_virt); | |
664 | err2: | |
665 | release_mem_region(fb_phys, screen_fb_size); | |
666 | err1: | |
667 | pci_dev_put(pdev); | |
668 | return -ENOMEM; | |
669 | } | |
670 | ||
671 | /* Release the framebuffer */ | |
672 | static void hvfb_putmem(struct fb_info *info) | |
673 | { | |
674 | iounmap(info->screen_base); | |
675 | release_mem_region(info->fix.smem_start, screen_fb_size); | |
676 | } | |
677 | ||
678 | ||
679 | static int hvfb_probe(struct hv_device *hdev, | |
680 | const struct hv_vmbus_device_id *dev_id) | |
681 | { | |
682 | struct fb_info *info; | |
683 | struct hvfb_par *par; | |
684 | int ret; | |
685 | ||
686 | info = framebuffer_alloc(sizeof(struct hvfb_par), &hdev->device); | |
687 | if (!info) { | |
688 | pr_err("No memory for framebuffer info\n"); | |
689 | return -ENOMEM; | |
690 | } | |
691 | ||
692 | par = info->par; | |
693 | par->info = info; | |
694 | par->fb_ready = false; | |
695 | init_completion(&par->wait); | |
696 | INIT_DELAYED_WORK(&par->dwork, hvfb_update_work); | |
697 | ||
698 | /* Connect to VSP */ | |
699 | hv_set_drvdata(hdev, info); | |
700 | ret = synthvid_connect_vsp(hdev); | |
701 | if (ret) { | |
702 | pr_err("Unable to connect to VSP\n"); | |
703 | goto error1; | |
704 | } | |
705 | ||
706 | ret = hvfb_getmem(info); | |
707 | if (ret) { | |
708 | pr_err("No memory for framebuffer\n"); | |
709 | goto error2; | |
710 | } | |
711 | ||
712 | hvfb_get_option(info); | |
713 | pr_info("Screen resolution: %dx%d, Color depth: %d\n", | |
714 | screen_width, screen_height, screen_depth); | |
715 | ||
716 | ||
717 | /* Set up fb_info */ | |
718 | info->flags = FBINFO_DEFAULT; | |
719 | ||
720 | info->var.xres_virtual = info->var.xres = screen_width; | |
721 | info->var.yres_virtual = info->var.yres = screen_height; | |
722 | info->var.bits_per_pixel = screen_depth; | |
723 | ||
724 | if (info->var.bits_per_pixel == 16) { | |
725 | info->var.red = (struct fb_bitfield){11, 5, 0}; | |
726 | info->var.green = (struct fb_bitfield){5, 6, 0}; | |
727 | info->var.blue = (struct fb_bitfield){0, 5, 0}; | |
728 | info->var.transp = (struct fb_bitfield){0, 0, 0}; | |
729 | } else { | |
730 | info->var.red = (struct fb_bitfield){16, 8, 0}; | |
731 | info->var.green = (struct fb_bitfield){8, 8, 0}; | |
732 | info->var.blue = (struct fb_bitfield){0, 8, 0}; | |
733 | info->var.transp = (struct fb_bitfield){24, 8, 0}; | |
734 | } | |
735 | ||
736 | info->var.activate = FB_ACTIVATE_NOW; | |
737 | info->var.height = -1; | |
738 | info->var.width = -1; | |
739 | info->var.vmode = FB_VMODE_NONINTERLACED; | |
740 | ||
741 | strcpy(info->fix.id, KBUILD_MODNAME); | |
742 | info->fix.type = FB_TYPE_PACKED_PIXELS; | |
743 | info->fix.visual = FB_VISUAL_TRUECOLOR; | |
744 | info->fix.line_length = screen_width * screen_depth / 8; | |
745 | info->fix.accel = FB_ACCEL_NONE; | |
746 | ||
747 | info->fbops = &hvfb_ops; | |
748 | info->pseudo_palette = par->pseudo_palette; | |
749 | ||
750 | /* Send config to host */ | |
751 | ret = synthvid_send_config(hdev); | |
752 | if (ret) | |
753 | goto error; | |
754 | ||
755 | ret = register_framebuffer(info); | |
756 | if (ret) { | |
757 | pr_err("Unable to register framebuffer\n"); | |
758 | goto error; | |
759 | } | |
760 | ||
761 | par->fb_ready = true; | |
762 | ||
763 | return 0; | |
764 | ||
765 | error: | |
766 | hvfb_putmem(info); | |
767 | error2: | |
768 | vmbus_close(hdev->channel); | |
769 | error1: | |
770 | cancel_delayed_work_sync(&par->dwork); | |
771 | hv_set_drvdata(hdev, NULL); | |
772 | framebuffer_release(info); | |
773 | return ret; | |
774 | } | |
775 | ||
776 | ||
777 | static int hvfb_remove(struct hv_device *hdev) | |
778 | { | |
779 | struct fb_info *info = hv_get_drvdata(hdev); | |
780 | struct hvfb_par *par = info->par; | |
781 | ||
782 | par->update = false; | |
783 | par->fb_ready = false; | |
784 | ||
785 | unregister_framebuffer(info); | |
786 | cancel_delayed_work_sync(&par->dwork); | |
787 | ||
788 | vmbus_close(hdev->channel); | |
789 | hv_set_drvdata(hdev, NULL); | |
790 | ||
791 | hvfb_putmem(info); | |
792 | framebuffer_release(info); | |
793 | ||
794 | return 0; | |
795 | } | |
796 | ||
797 | ||
798 | static const struct hv_vmbus_device_id id_table[] = { | |
799 | /* Synthetic Video Device GUID */ | |
800 | {HV_SYNTHVID_GUID}, | |
801 | {} | |
802 | }; | |
803 | ||
804 | MODULE_DEVICE_TABLE(vmbus, id_table); | |
805 | ||
806 | static struct hv_driver hvfb_drv = { | |
807 | .name = KBUILD_MODNAME, | |
808 | .id_table = id_table, | |
809 | .probe = hvfb_probe, | |
810 | .remove = hvfb_remove, | |
811 | }; | |
812 | ||
813 | ||
814 | static int __init hvfb_drv_init(void) | |
815 | { | |
816 | return vmbus_driver_register(&hvfb_drv); | |
817 | } | |
818 | ||
819 | static void __exit hvfb_drv_exit(void) | |
820 | { | |
821 | vmbus_driver_unregister(&hvfb_drv); | |
822 | } | |
823 | ||
824 | module_init(hvfb_drv_init); | |
825 | module_exit(hvfb_drv_exit); | |
826 | ||
827 | MODULE_LICENSE("GPL"); | |
68a2d20b | 828 | MODULE_DESCRIPTION("Microsoft Hyper-V Synthetic Video Frame Buffer Driver"); |