xref: /freebsd/sys/compat/linsysfs/linsysfs.c (revision f126890a) 
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2006 IronPort Systems
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 AND CONTRIBUTORS ``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 
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/ctype.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/mount.h>
35 #include <sys/sbuf.h>
36 #include <sys/smp.h>
37 #include <sys/bus.h>
38 #include <sys/pciio.h>
39 
40 #include <dev/pci/pcivar.h>
41 #include <dev/pci/pcireg.h>
42 
43 #include <compat/linux/linux_util.h>
44 #include <fs/pseudofs/pseudofs.h>
45 
46 #include <compat/linsysfs/linsysfs.h>
47 
48 MALLOC_DEFINE(M_LINSYSFS, "linsysfs", "Linsysfs structures");
49 
50 struct scsi_host_queue {
51 	TAILQ_ENTRY(scsi_host_queue) scsi_host_next;
52 	char *path;
53 	char *name;
54 };
55 
56 TAILQ_HEAD(,scsi_host_queue) scsi_host_q;
57 
58 static int host_number = 0;
59 
60 static int
61 atoi(const char *str)
62 {
63 	return (int)strtol(str, (char **)NULL, 10);
64 }
65 
66 /*
67  * Filler function for proc_name
68  */
69 static int
70 linsysfs_scsiname(PFS_FILL_ARGS)
71 {
72 	struct scsi_host_queue *scsi_host;
73 	int index;
74 
75 	if (strncmp(pn->pn_parent->pn_name, "host", 4) == 0) {
76 		index = atoi(&pn->pn_parent->pn_name[4]);
77 	} else {
78 		sbuf_printf(sb, "unknown\n");
79 		return (0);
80 	}
81 	TAILQ_FOREACH(scsi_host, &scsi_host_q, scsi_host_next) {
82 		if (index-- == 0) {
83 			sbuf_printf(sb, "%s\n", scsi_host->name);
84 			return (0);
85 		}
86 	}
87 	sbuf_printf(sb, "unknown\n");
88 	return (0);
89 }
90 
91 /*
92  * Filler function for device sym-link
93  */
94 static int
95 linsysfs_link_scsi_host(PFS_FILL_ARGS)
96 {
97 	struct scsi_host_queue *scsi_host;
98 	int index;
99 
100 	if (strncmp(pn->pn_parent->pn_name, "host", 4) == 0) {
101 		index = atoi(&pn->pn_parent->pn_name[4]);
102 	} else {
103 		sbuf_printf(sb, "unknown\n");
104 		return (0);
105 	}
106 	TAILQ_FOREACH(scsi_host, &scsi_host_q, scsi_host_next) {
107 		if (index-- == 0) {
108 			sbuf_printf(sb, "../../../devices%s", scsi_host->path);
109 			return(0);
110 		}
111 	}
112 	sbuf_printf(sb, "unknown\n");
113 	return (0);
114 }
115 
116 static int
117 linsysfs_fill_data(PFS_FILL_ARGS)
118 {
119 	sbuf_printf(sb, "%s", (char *)pn->pn_data);
120 	return (0);
121 }
122 
123 static int
124 linsysfs_fill_vendor(PFS_FILL_ARGS)
125 {
126 	sbuf_printf(sb, "0x%04x\n", pci_get_vendor((device_t)pn->pn_data));
127 	return (0);
128 }
129 
130 static int
131 linsysfs_fill_device(PFS_FILL_ARGS)
132 {
133 	sbuf_printf(sb, "0x%04x\n", pci_get_device((device_t)pn->pn_data));
134 	return (0);
135 }
136 
137 static int
138 linsysfs_fill_subvendor(PFS_FILL_ARGS)
139 {
140 	sbuf_printf(sb, "0x%04x\n", pci_get_subvendor((device_t)pn->pn_data));
141 	return (0);
142 }
143 
144 static int
145 linsysfs_fill_subdevice(PFS_FILL_ARGS)
146 {
147 	sbuf_printf(sb, "0x%04x\n", pci_get_subdevice((device_t)pn->pn_data));
148 	return (0);
149 }
150 
151 static int
152 linsysfs_fill_revid(PFS_FILL_ARGS)
153 {
154 	sbuf_printf(sb, "0x%x\n", pci_get_revid((device_t)pn->pn_data));
155 	return (0);
156 }
157 
158 static int
159 linsysfs_fill_config(PFS_FILL_ARGS)
160 {
161 	uint8_t config[48];
162 	device_t dev;
163 	uint32_t reg;
164 
165 	dev = (device_t)pn->pn_data;
166 	bzero(config, sizeof(config));
167 	reg = pci_get_vendor(dev);
168 	config[0] = reg;
169 	config[1] = reg >> 8;
170 	reg = pci_get_device(dev);
171 	config[2] = reg;
172 	config[3] = reg >> 8;
173 	reg = pci_get_revid(dev);
174 	config[8] = reg;
175 	reg = pci_get_subvendor(dev);
176 	config[44] = reg;
177 	config[45] = reg >> 8;
178 	reg = pci_get_subdevice(dev);
179 	config[46] = reg;
180 	config[47] = reg >> 8;
181 	sbuf_bcat(sb, config, sizeof(config));
182 	return (0);
183 }
184 
185 /*
186  * Filler function for PCI uevent file
187  */
188 static int
189 linsysfs_fill_uevent_pci(PFS_FILL_ARGS)
190 {
191 	device_t dev;
192 
193 	dev = (device_t)pn->pn_data;
194 	sbuf_printf(sb, "DRIVER=%s\nPCI_CLASS=%X\nPCI_ID=%04X:%04X\n"
195 	    "PCI_SUBSYS_ID=%04X:%04X\nPCI_SLOT_NAME=%04d:%02x:%02x.%x\n",
196 	    linux_driver_get_name_dev(dev), pci_get_class(dev),
197 	    pci_get_vendor(dev), pci_get_device(dev), pci_get_subvendor(dev),
198 	    pci_get_subdevice(dev), pci_get_domain(dev), pci_get_bus(dev),
199 	    pci_get_slot(dev), pci_get_function(dev));
200 	return (0);
201 }
202 
203 /*
204  * Filler function for drm uevent file
205  */
206 static int
207 linsysfs_fill_uevent_drm(PFS_FILL_ARGS)
208 {
209 	device_t dev;
210 	int unit;
211 
212 	dev = (device_t)pn->pn_data;
213 	unit = device_get_unit(dev);
214 	sbuf_printf(sb,
215 	    "MAJOR=226\nMINOR=%d\nDEVNAME=dri/card%d\nDEVTYPE=dri_minor\n",
216 	    unit, unit);
217 	return (0);
218 }
219 
220 static char *
221 get_full_pfs_path(struct pfs_node *cur)
222 {
223 	char *temp, *path;
224 
225 	temp = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
226 	path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
227 	path[0] = '\0';
228 
229 	do {
230 		snprintf(temp, MAXPATHLEN, "%s/%s", cur->pn_name, path);
231 		strlcpy(path, temp, MAXPATHLEN);
232 		cur = cur->pn_parent;
233 	} while (cur->pn_parent != NULL);
234 
235 	path[strlen(path) - 1] = '\0'; /* remove extra slash */
236 	free(temp, M_TEMP);
237 	return (path);
238 }
239 
240 /*
241  * Filler function for symlink from drm char device to PCI device
242  */
243 static int
244 linsysfs_fill_vgapci(PFS_FILL_ARGS)
245 {
246 	char *path;
247 
248 	path = get_full_pfs_path((struct pfs_node*)pn->pn_data);
249 	sbuf_printf(sb, "../../../%s", path);
250 	free(path, M_TEMP);
251 	return (0);
252 }
253 
254 #undef PCI_DEV
255 #define PCI_DEV "pci"
256 #define DRMN_DEV "drmn"
257 static int
258 linsysfs_run_bus(device_t dev, struct pfs_node *dir, struct pfs_node *scsi,
259     struct pfs_node *chardev, struct pfs_node *drm, char *path, char *prefix)
260 {
261 	struct scsi_host_queue *scsi_host;
262 	struct pfs_node *sub_dir, *cur_file;
263 	int i, nchildren, error;
264 	device_t *children, parent;
265 	devclass_t devclass;
266 	const char *name = NULL;
267 	struct pci_devinfo *dinfo;
268 	char *device, *host, *new_path, *devname;
269 
270 	new_path = path;
271 	devname = malloc(16, M_TEMP, M_WAITOK);
272 
273 	parent = device_get_parent(dev);
274 	if (parent) {
275 		devclass = device_get_devclass(parent);
276 		if (devclass != NULL)
277 			name = devclass_get_name(devclass);
278 		if (name && strcmp(name, PCI_DEV) == 0) {
279 			dinfo = device_get_ivars(dev);
280 			if (dinfo) {
281 				device = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
282 				new_path = malloc(MAXPATHLEN, M_TEMP,
283 				    M_WAITOK);
284 				new_path[0] = '\000';
285 				strcpy(new_path, path);
286 				host = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
287 				device[0] = '\000';
288 				sprintf(device, "%s:%02x:%02x.%x",
289 				    prefix,
290 				    dinfo->cfg.bus,
291 				    dinfo->cfg.slot,
292 				    dinfo->cfg.func);
293 				strcat(new_path, "/");
294 				strcat(new_path, device);
295 				dir = pfs_create_dir(dir, device,
296 				    NULL, NULL, NULL, 0);
297 				cur_file = pfs_create_file(dir, "vendor",
298 				    &linsysfs_fill_vendor, NULL, NULL, NULL,
299 				    PFS_RD);
300 				cur_file->pn_data = (void*)dev;
301 				cur_file = pfs_create_file(dir, "device",
302 				    &linsysfs_fill_device, NULL, NULL, NULL,
303 				    PFS_RD);
304 				cur_file->pn_data = (void*)dev;
305 				cur_file = pfs_create_file(dir,
306 				    "subsystem_vendor",
307 				    &linsysfs_fill_subvendor, NULL, NULL, NULL,
308 				    PFS_RD);
309 				cur_file->pn_data = (void*)dev;
310 				cur_file = pfs_create_file(dir,
311 				    "subsystem_device",
312 				    &linsysfs_fill_subdevice, NULL, NULL, NULL,
313 				    PFS_RD);
314 				cur_file->pn_data = (void*)dev;
315 				cur_file = pfs_create_file(dir, "revision",
316 				    &linsysfs_fill_revid, NULL, NULL, NULL,
317 				    PFS_RD);
318 				cur_file->pn_data = (void*)dev;
319 				cur_file = pfs_create_file(dir, "config",
320 				    &linsysfs_fill_config, NULL, NULL, NULL,
321 				    PFS_RD);
322 				cur_file->pn_data = (void*)dev;
323 				cur_file = pfs_create_file(dir, "uevent",
324 				    &linsysfs_fill_uevent_pci, NULL, NULL,
325 				    NULL, PFS_RD);
326 				cur_file->pn_data = (void*)dev;
327 				cur_file = pfs_create_link(dir, "subsystem",
328 				    &linsysfs_fill_data, NULL, NULL, NULL, 0);
329 				/* libdrm just checks that the link ends in "/pci" */
330 				cur_file->pn_data = "/sys/bus/pci";
331 
332 				if (dinfo->cfg.baseclass == PCIC_STORAGE) {
333 					/* DJA only make this if needed */
334 					sprintf(host, "host%d", host_number++);
335 					strcat(new_path, "/");
336 					strcat(new_path, host);
337 					pfs_create_dir(dir, host,
338 					    NULL, NULL, NULL, 0);
339 					scsi_host = malloc(sizeof(
340 					    struct scsi_host_queue),
341 					    M_DEVBUF, M_NOWAIT);
342 					scsi_host->path = malloc(
343 					    strlen(new_path) + 1,
344 					    M_DEVBUF, M_NOWAIT);
345 					scsi_host->path[0] = '\000';
346 					bcopy(new_path, scsi_host->path,
347 					    strlen(new_path) + 1);
348 					scsi_host->name = "unknown";
349 
350 					sub_dir = pfs_create_dir(scsi, host,
351 					    NULL, NULL, NULL, 0);
352 					pfs_create_link(sub_dir, "device",
353 					    &linsysfs_link_scsi_host,
354 					    NULL, NULL, NULL, 0);
355 					pfs_create_file(sub_dir, "proc_name",
356 					    &linsysfs_scsiname,
357 					    NULL, NULL, NULL, PFS_RD);
358 					scsi_host->name
359 					    = linux_driver_get_name_dev(dev);
360 					TAILQ_INSERT_TAIL(&scsi_host_q,
361 					    scsi_host, scsi_host_next);
362 				}
363 				free(device, M_TEMP);
364 				free(host, M_TEMP);
365 			}
366 		}
367 
368 		devclass = device_get_devclass(dev);
369 		if (devclass != NULL)
370 			name = devclass_get_name(devclass);
371 		else
372 			name = NULL;
373 		if (name != NULL && strcmp(name, DRMN_DEV) == 0 &&
374 		    device_get_unit(dev) >= 0) {
375 			dinfo = device_get_ivars(parent);
376 			if (dinfo != NULL && dinfo->cfg.baseclass == PCIC_DISPLAY) {
377 				pfs_create_dir(dir, "drm", NULL, NULL, NULL, 0);
378 				sprintf(devname, "226:%d",
379 				    device_get_unit(dev));
380 				sub_dir = pfs_create_dir(chardev,
381 				    devname, NULL, NULL, NULL, 0);
382 				cur_file = pfs_create_link(sub_dir,
383 				    "device", &linsysfs_fill_vgapci, NULL,
384 				    NULL, NULL, PFS_RD);
385 				cur_file->pn_data = (void*)dir;
386 				cur_file = pfs_create_file(sub_dir,
387 				    "uevent", &linsysfs_fill_uevent_drm, NULL,
388 				    NULL, NULL, PFS_RD);
389 				cur_file->pn_data = (void*)dev;
390 				sprintf(devname, "card%d",
391 				    device_get_unit(dev));
392 				sub_dir = pfs_create_dir(drm,
393 				    devname, NULL, NULL, NULL, 0);
394 				cur_file = pfs_create_link(sub_dir,
395 				    "device", &linsysfs_fill_vgapci, NULL,
396 				    NULL, NULL, PFS_RD);
397 				cur_file->pn_data = (void*)dir;
398 			}
399 		}
400 	}
401 
402 	error = device_get_children(dev, &children, &nchildren);
403 	if (error == 0) {
404 		for (i = 0; i < nchildren; i++)
405 			if (children[i])
406 				linsysfs_run_bus(children[i], dir, scsi,
407 				    chardev, drm, new_path, prefix);
408 		free(children, M_TEMP);
409 	}
410 	if (new_path != path)
411 		free(new_path, M_TEMP);
412 	free(devname, M_TEMP);
413 
414 	return (1);
415 }
416 
417 /*
418  * Filler function for sys/devices/system/cpu/{online,possible,present}
419  */
420 static int
421 linsysfs_cpuonline(PFS_FILL_ARGS)
422 {
423 
424 	sbuf_printf(sb, "%d-%d\n", CPU_FIRST(), mp_maxid);
425 	return (0);
426 }
427 
428 /*
429  * Filler function for sys/devices/system/cpu/cpuX/online
430  */
431 static int
432 linsysfs_cpuxonline(PFS_FILL_ARGS)
433 {
434 
435 	sbuf_printf(sb, "1\n");
436 	return (0);
437 }
438 
439 static void
440 linsysfs_listcpus(struct pfs_node *dir)
441 {
442 	struct pfs_node *cpu;
443 	char *name;
444 	int i, count, len;
445 
446 	len = 1;
447 	count = mp_maxcpus;
448 	while (count > 10) {
449 		count /= 10;
450 		len++;
451 	}
452 	len += sizeof("cpu");
453 	name = malloc(len, M_TEMP, M_WAITOK);
454 
455 	for (i = 0; i < mp_ncpus; ++i) {
456 		/* /sys/devices/system/cpu/cpuX */
457 		sprintf(name, "cpu%d", i);
458 		cpu = pfs_create_dir(dir, name, NULL, NULL, NULL, 0);
459 
460 		pfs_create_file(cpu, "online", &linsysfs_cpuxonline,
461 		    NULL, NULL, NULL, PFS_RD);
462 	}
463 	free(name, M_TEMP);
464 }
465 
466 /*
467  * Constructor
468  */
469 static int
470 linsysfs_init(PFS_INIT_ARGS)
471 {
472 	struct pfs_node *root;
473 	struct pfs_node *class;
474 	struct pfs_node *dir, *sys, *cpu;
475 	struct pfs_node *drm;
476 	struct pfs_node *pci;
477 	struct pfs_node *scsi;
478 	struct pfs_node *devdir, *chardev;
479 	struct pfs_node *kernel;
480 	devclass_t devclass;
481 	device_t dev;
482 
483 	TAILQ_INIT(&scsi_host_q);
484 
485 	root = pi->pi_root;
486 
487 	/* /sys/bus/... */
488 	dir = pfs_create_dir(root, "bus", NULL, NULL, NULL, 0);
489 
490 	/* /sys/class/... */
491 	class = pfs_create_dir(root, "class", NULL, NULL, NULL, 0);
492 	scsi = pfs_create_dir(class, "scsi_host", NULL, NULL, NULL, 0);
493 	drm = pfs_create_dir(class, "drm", NULL, NULL, NULL, 0);
494 	pfs_create_dir(class, "power_supply", NULL, NULL, NULL, 0);
495 
496 	/* /sys/class/net/.. */
497 	net = pfs_create_dir(class, "net", NULL, NULL, NULL, 0);
498 
499 	/* /sys/dev/... */
500 	devdir = pfs_create_dir(root, "dev", NULL, NULL, NULL, 0);
501 	chardev = pfs_create_dir(devdir, "char", NULL, NULL, NULL, 0);
502 
503 	/* /sys/devices/... */
504 	dir = pfs_create_dir(root, "devices", NULL, NULL, NULL, 0);
505 	pci = pfs_create_dir(dir, "pci0000:00", NULL, NULL, NULL, 0);
506 
507 	devclass = devclass_find("root");
508 	if (devclass == NULL) {
509 		return (0);
510 	}
511 
512 	dev = devclass_get_device(devclass, 0);
513 	linsysfs_run_bus(dev, pci, scsi, chardev, drm, "/pci0000:00", "0000");
514 
515 	/* /sys/devices/system */
516 	sys = pfs_create_dir(dir, "system", NULL, NULL, NULL, 0);
517 
518 	/* /sys/devices/system/cpu */
519 	cpu = pfs_create_dir(sys, "cpu", NULL, NULL, NULL, 0);
520 
521 	pfs_create_file(cpu, "online", &linsysfs_cpuonline,
522 	    NULL, NULL, NULL, PFS_RD);
523 	pfs_create_file(cpu, "possible", &linsysfs_cpuonline,
524 	    NULL, NULL, NULL, PFS_RD);
525 	pfs_create_file(cpu, "present", &linsysfs_cpuonline,
526 	    NULL, NULL, NULL, PFS_RD);
527 
528 	linsysfs_listcpus(cpu);
529 
530 	/* /sys/kernel */
531 	kernel = pfs_create_dir(root, "kernel", NULL, NULL, NULL, 0);
532 	/* /sys/kernel/debug, mountpoint for lindebugfs. */
533 	pfs_create_dir(kernel, "debug", NULL, NULL, NULL, 0);
534 
535 	linsysfs_net_init();
536 
537 	return (0);
538 }
539 
540 /*
541  * Destructor
542  */
543 static int
544 linsysfs_uninit(PFS_INIT_ARGS)
545 {
546 	struct scsi_host_queue *scsi_host, *scsi_host_tmp;
547 
548 	TAILQ_FOREACH_SAFE(scsi_host, &scsi_host_q, scsi_host_next,
549 	    scsi_host_tmp) {
550 		TAILQ_REMOVE(&scsi_host_q, scsi_host, scsi_host_next);
551 		free(scsi_host->path, M_TEMP);
552 		free(scsi_host, M_TEMP);
553 	}
554 
555 	linsysfs_net_uninit();
556 
557 	return (0);
558 }
559 
560 PSEUDOFS(linsysfs, 1, VFCF_JAIL);
561 #if defined(__aarch64__) || defined(__amd64__)
562 MODULE_DEPEND(linsysfs, linux_common, 1, 1, 1);
563 #else
564 MODULE_DEPEND(linsysfs, linux, 1, 1, 1);
565 #endif
566