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In bhyve's fbuf emulation improve the overall "usage" message and
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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2015 Nahanni Systems, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  *
28  * $FreeBSD$
29  */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/types.h>
35 #include <sys/mman.h>
36
37 #include <machine/vmm.h>
38 #include <vmmapi.h>
39
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43
44 #include <errno.h>
45 #include <unistd.h>
46
47 #include "bhyvegc.h"
48 #include "bhyverun.h"
49 #include "console.h"
50 #include "inout.h"
51 #include "pci_emul.h"
52 #include "rfb.h"
53 #include "vga.h"
54
55 /*
56  * bhyve Framebuffer device emulation.
57  * BAR0 points to the current mode information.
58  * BAR1 is the 32-bit framebuffer address.
59  *
60  *  -s <b>,fbuf,wait,vga=on|io|off,rfb=<ip>:port,w=width,h=height
61  */
62
63 static int fbuf_debug = 1;
64 #define DEBUG_INFO      1
65 #define DEBUG_VERBOSE   4
66 #define DPRINTF(level, params)  if (level <= fbuf_debug) printf params
67
68
69 #define KB      (1024UL)
70 #define MB      (1024 * 1024UL)
71
72 #define DMEMSZ  128
73
74 #define FB_SIZE         (16*MB)
75
76 #define COLS_MAX        1920
77 #define ROWS_MAX        1200
78
79 #define COLS_DEFAULT    1024
80 #define ROWS_DEFAULT    768
81
82 #define COLS_MIN        640
83 #define ROWS_MIN        480
84
85 struct pci_fbuf_softc {
86         struct pci_devinst *fsc_pi;
87         struct {
88                 uint32_t fbsize;
89                 uint16_t width;
90                 uint16_t height;
91                 uint16_t depth;
92                 uint16_t refreshrate;
93                 uint8_t  reserved[116];
94         } __packed memregs;
95
96         /* rfb server */
97         char      *rfb_host;
98         char      *rfb_password;
99         int       rfb_port;
100         int       rfb_wait;
101         int       vga_enabled;
102         int       vga_full;
103
104         uint32_t  fbaddr;
105         char      *fb_base;
106         uint16_t  gc_width;
107         uint16_t  gc_height;
108         void      *vgasc;
109         struct bhyvegc_image *gc_image;
110 };
111
112 static struct pci_fbuf_softc *fbuf_sc;
113
114 #define PCI_FBUF_MSI_MSGS        4
115
116 static void
117 pci_fbuf_usage(char *opt)
118 {
119
120         fprintf(stderr, "Invalid fbuf emulation option \"%s\"\r\n", opt);
121         fprintf(stderr, "fbuf: {wait,}{vga=on|io|off,}rfb=<ip>:port"
122             "{,w=width}{,h=height}\r\n");
123 }
124
125 static void
126 pci_fbuf_write(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
127                int baridx, uint64_t offset, int size, uint64_t value)
128 {
129         struct pci_fbuf_softc *sc;
130         uint8_t *p;
131
132         assert(baridx == 0);
133
134         sc = pi->pi_arg;
135
136         DPRINTF(DEBUG_VERBOSE,
137             ("fbuf wr: offset 0x%lx, size: %d, value: 0x%lx\n",
138             offset, size, value));
139
140         if (offset + size > DMEMSZ) {
141                 printf("fbuf: write too large, offset %ld size %d\n",
142                        offset, size);
143                 return;
144         }
145
146         p = (uint8_t *)&sc->memregs + offset;
147
148         switch (size) {
149         case 1:
150                 *p = value;
151                 break;
152         case 2:
153                 *(uint16_t *)p = value;
154                 break;
155         case 4:
156                 *(uint32_t *)p = value;
157                 break;
158         case 8:
159                 *(uint64_t *)p = value;
160                 break;
161         default:
162                 printf("fbuf: write unknown size %d\n", size);
163                 break;
164         }
165
166         if (!sc->gc_image->vgamode && sc->memregs.width == 0 &&
167             sc->memregs.height == 0) {
168                 DPRINTF(DEBUG_INFO, ("switching to VGA mode\r\n"));
169                 sc->gc_image->vgamode = 1;
170                 sc->gc_width = 0;
171                 sc->gc_height = 0;
172         } else if (sc->gc_image->vgamode && sc->memregs.width != 0 &&
173             sc->memregs.height != 0) {
174                 DPRINTF(DEBUG_INFO, ("switching to VESA mode\r\n"));
175                 sc->gc_image->vgamode = 0;
176         }
177 }
178
179 uint64_t
180 pci_fbuf_read(struct vmctx *ctx, int vcpu, struct pci_devinst *pi,
181               int baridx, uint64_t offset, int size)
182 {
183         struct pci_fbuf_softc *sc;
184         uint8_t *p;
185         uint64_t value;
186
187         assert(baridx == 0);
188
189         sc = pi->pi_arg;
190
191
192         if (offset + size > DMEMSZ) {
193                 printf("fbuf: read too large, offset %ld size %d\n",
194                        offset, size);
195                 return (0);
196         }
197
198         p = (uint8_t *)&sc->memregs + offset;
199         value = 0;
200         switch (size) {
201         case 1:
202                 value = *p;
203                 break;
204         case 2:
205                 value = *(uint16_t *)p;
206                 break;
207         case 4:
208                 value = *(uint32_t *)p;
209                 break;
210         case 8:
211                 value = *(uint64_t *)p;
212                 break;
213         default:
214                 printf("fbuf: read unknown size %d\n", size);
215                 break;
216         }
217
218         DPRINTF(DEBUG_VERBOSE,
219             ("fbuf rd: offset 0x%lx, size: %d, value: 0x%lx\n",
220              offset, size, value));
221
222         return (value);
223 }
224
225 static int
226 pci_fbuf_parse_opts(struct pci_fbuf_softc *sc, char *opts)
227 {
228         char    *uopts, *xopts, *config;
229         char    *tmpstr;
230         int     ret;
231
232         ret = 0;
233         uopts = strdup(opts);
234         for (xopts = strtok(uopts, ",");
235              xopts != NULL;
236              xopts = strtok(NULL, ",")) {
237                 if (strcmp(xopts, "wait") == 0) {
238                         sc->rfb_wait = 1;
239                         continue;
240                 }
241
242                 if ((config = strchr(xopts, '=')) == NULL) {
243                         pci_fbuf_usage(xopts);
244                         ret = -1;
245                         goto done;
246                 }
247
248                 *config++ = '\0';
249
250                 DPRINTF(DEBUG_VERBOSE, ("pci_fbuf option %s = %s\r\n",
251                    xopts, config));
252
253                 if (!strcmp(xopts, "tcp") || !strcmp(xopts, "rfb")) {
254                         /* parse host-ip:port */
255                         tmpstr = strsep(&config, ":");
256                         if (!config)
257                                 sc->rfb_port = atoi(tmpstr);
258                         else {
259                                 sc->rfb_port = atoi(config);
260                                 sc->rfb_host = tmpstr;
261                         }
262                 } else if (!strcmp(xopts, "vga")) {
263                         if (!strcmp(config, "off")) {
264                                 sc->vga_enabled = 0;
265                         } else if (!strcmp(config, "io")) {
266                                 sc->vga_enabled = 1;
267                                 sc->vga_full = 0;
268                         } else if (!strcmp(config, "on")) {
269                                 sc->vga_enabled = 1;
270                                 sc->vga_full = 1;
271                         } else {
272                                 pci_fbuf_usage(xopts);
273                                 ret = -1;
274                                 goto done;
275                         }
276                 } else if (!strcmp(xopts, "w")) {
277                         sc->memregs.width = atoi(config);
278                         if (sc->memregs.width > COLS_MAX) {
279                                 pci_fbuf_usage(xopts);
280                                 ret = -1;
281                                 goto done;
282                         } else if (sc->memregs.width == 0)
283                                 sc->memregs.width = 1920;
284                 } else if (!strcmp(xopts, "h")) {
285                         sc->memregs.height = atoi(config);
286                         if (sc->memregs.height > ROWS_MAX) {
287                                 pci_fbuf_usage(xopts);
288                                 ret = -1;
289                                 goto done;
290                         } else if (sc->memregs.height == 0)
291                                 sc->memregs.height = 1080;
292                 } else if (!strcmp(xopts, "password")) {
293                         sc->rfb_password = config;
294                 } else {
295                         pci_fbuf_usage(xopts);
296                         ret = -1;
297                         goto done;
298                 }
299         }
300
301 done:
302         return (ret);
303 }
304
305
306 extern void vga_render(struct bhyvegc *gc, void *arg);
307
308 void
309 pci_fbuf_render(struct bhyvegc *gc, void *arg)
310 {
311         struct pci_fbuf_softc *sc;
312
313         sc = arg;
314
315         if (sc->vga_full && sc->gc_image->vgamode) {
316                 /* TODO: mode switching to vga and vesa should use the special
317                  *      EFI-bhyve protocol port.
318                  */
319                 vga_render(gc, sc->vgasc);
320                 return;
321         }
322         if (sc->gc_width != sc->memregs.width ||
323             sc->gc_height != sc->memregs.height) {
324                 bhyvegc_resize(gc, sc->memregs.width, sc->memregs.height);
325                 sc->gc_width = sc->memregs.width;
326                 sc->gc_height = sc->memregs.height;
327         }
328
329         return;
330 }
331
332 static int
333 pci_fbuf_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
334 {
335         int error, prot;
336         struct pci_fbuf_softc *sc;
337         
338         if (fbuf_sc != NULL) {
339                 fprintf(stderr, "Only one frame buffer device is allowed.\n");
340                 return (-1);
341         }
342
343         sc = calloc(1, sizeof(struct pci_fbuf_softc));
344
345         pi->pi_arg = sc;
346
347         /* initialize config space */
348         pci_set_cfgdata16(pi, PCIR_DEVICE, 0x40FB);
349         pci_set_cfgdata16(pi, PCIR_VENDOR, 0xFB5D);
350         pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_DISPLAY);
351         pci_set_cfgdata8(pi, PCIR_SUBCLASS, PCIS_DISPLAY_VGA);
352
353         error = pci_emul_alloc_bar(pi, 0, PCIBAR_MEM32, DMEMSZ);
354         assert(error == 0);
355
356         error = pci_emul_alloc_bar(pi, 1, PCIBAR_MEM32, FB_SIZE);
357         assert(error == 0);
358
359         error = pci_emul_add_msicap(pi, PCI_FBUF_MSI_MSGS);
360         assert(error == 0);
361
362         sc->fbaddr = pi->pi_bar[1].addr;
363         sc->memregs.fbsize = FB_SIZE;
364         sc->memregs.width  = COLS_DEFAULT;
365         sc->memregs.height = ROWS_DEFAULT;
366         sc->memregs.depth  = 32;
367
368         sc->vga_enabled = 1;
369         sc->vga_full = 0;
370
371         sc->fsc_pi = pi;
372
373         error = pci_fbuf_parse_opts(sc, opts);
374         if (error != 0)
375                 goto done;
376
377         /* XXX until VGA rendering is enabled */
378         if (sc->vga_full != 0) {
379                 fprintf(stderr, "pci_fbuf: VGA rendering not enabled");
380                 goto done;
381         }
382
383         sc->fb_base = vm_create_devmem(ctx, VM_FRAMEBUFFER, "framebuffer", FB_SIZE);
384         if (sc->fb_base == MAP_FAILED) {
385                 error = -1;
386                 goto done;
387         }
388         DPRINTF(DEBUG_INFO, ("fbuf frame buffer base: %p [sz %lu]\r\n",
389                 sc->fb_base, FB_SIZE));
390
391         /*
392          * Map the framebuffer into the guest address space.
393          * XXX This may fail if the BAR is different than a prior
394          * run. In this case flag the error. This will be fixed
395          * when a change_memseg api is available.
396          */
397         prot = PROT_READ | PROT_WRITE;
398         if (vm_mmap_memseg(ctx, sc->fbaddr, VM_FRAMEBUFFER, 0, FB_SIZE, prot) != 0) {
399                 fprintf(stderr, "pci_fbuf: mapseg failed - try deleting VM and restarting\n");
400                 error = -1;
401                 goto done;
402         }
403
404         console_init(sc->memregs.width, sc->memregs.height, sc->fb_base);
405         console_fb_register(pci_fbuf_render, sc);
406
407         if (sc->vga_enabled)
408                 sc->vgasc = vga_init(!sc->vga_full);
409         sc->gc_image = console_get_image();
410
411         fbuf_sc = sc;
412
413         memset((void *)sc->fb_base, 0, FB_SIZE);
414
415         error = rfb_init(sc->rfb_host, sc->rfb_port, sc->rfb_wait, sc->rfb_password);
416 done:
417         if (error)
418                 free(sc);
419
420         return (error);
421 }
422
423 struct pci_devemu pci_fbuf = {
424         .pe_emu =       "fbuf",
425         .pe_init =      pci_fbuf_init,
426         .pe_barwrite =  pci_fbuf_write,
427         .pe_barread =   pci_fbuf_read
428 };
429 PCI_EMUL_SET(pci_fbuf);