xref: /freebsd/sys/compat/linsysfs/linsysfs.c (revision c36e54bb328697af1e6113812caecbd3bac89fe0)
1 /*-
2  * Copyright (c) 2006 IronPort Systems
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/queue.h>
33 #include <sys/blist.h>
34 #include <sys/conf.h>
35 #include <sys/exec.h>
36 #include <sys/filedesc.h>
37 #include <sys/kernel.h>
38 #include <sys/linker.h>
39 #include <sys/malloc.h>
40 #include <sys/mount.h>
41 #include <sys/mutex.h>
42 #include <sys/proc.h>
43 #include <sys/resourcevar.h>
44 #include <sys/sbuf.h>
45 #include <sys/smp.h>
46 #include <sys/socket.h>
47 #include <sys/vnode.h>
48 #include <sys/bus.h>
49 #include <sys/pciio.h>
50 
51 #include <dev/pci/pcivar.h>
52 #include <dev/pci/pcireg.h>
53 
54 #include <net/if.h>
55 
56 #include <vm/vm.h>
57 #include <vm/pmap.h>
58 #include <vm/vm_map.h>
59 #include <vm/vm_param.h>
60 #include <vm/vm_object.h>
61 #include <vm/swap_pager.h>
62 
63 #include <machine/bus.h>
64 
65 #include <compat/linux/linux_ioctl.h>
66 #include <compat/linux/linux_mib.h>
67 #include <compat/linux/linux_util.h>
68 #include <fs/pseudofs/pseudofs.h>
69 
70 struct scsi_host_queue {
71 	TAILQ_ENTRY(scsi_host_queue) scsi_host_next;
72 	char *path;
73 	char *name;
74 };
75 
76 TAILQ_HEAD(,scsi_host_queue) scsi_host_q;
77 
78 static int host_number = 0;
79 
80 static int
81 atoi(const char *str)
82 {
83 	return (int)strtol(str, (char **)NULL, 10);
84 }
85 
86 /*
87  * Filler function for proc_name
88  */
89 static int
90 linsysfs_scsiname(PFS_FILL_ARGS)
91 {
92 	struct scsi_host_queue *scsi_host;
93 	int index;
94 
95 	if (strncmp(pn->pn_parent->pn_name, "host", 4) == 0) {
96 		index = atoi(&pn->pn_parent->pn_name[4]);
97 	} else {
98 		sbuf_printf(sb, "unknown\n");
99 		return (0);
100 	}
101 	TAILQ_FOREACH(scsi_host, &scsi_host_q, scsi_host_next) {
102 		if (index-- == 0) {
103 			sbuf_printf(sb, "%s\n", scsi_host->name);
104 			return (0);
105 		}
106 	}
107 	sbuf_printf(sb, "unknown\n");
108 	return (0);
109 }
110 
111 /*
112  * Filler function for device sym-link
113  */
114 static int
115 linsysfs_link_scsi_host(PFS_FILL_ARGS)
116 {
117 	struct scsi_host_queue *scsi_host;
118 	int index;
119 
120 	if (strncmp(pn->pn_parent->pn_name, "host", 4) == 0) {
121 		index = atoi(&pn->pn_parent->pn_name[4]);
122 	} else {
123 		sbuf_printf(sb, "unknown\n");
124 		return (0);
125 	}
126 	TAILQ_FOREACH(scsi_host, &scsi_host_q, scsi_host_next) {
127 		if (index-- == 0) {
128 			sbuf_printf(sb, "../../../devices%s", scsi_host->path);
129 			return(0);
130 		}
131 	}
132 	sbuf_printf(sb, "unknown\n");
133 	return (0);
134 }
135 
136 #define PCI_DEV "pci"
137 static int
138 linsysfs_run_bus(device_t dev, struct pfs_node *dir, struct pfs_node *scsi, char *path,
139    char *prefix)
140 {
141 	struct scsi_host_queue *scsi_host;
142 	struct pfs_node *sub_dir;
143 	int i, nchildren;
144 	device_t *children, parent;
145 	devclass_t devclass;
146 	const char *name = NULL;
147 	struct pci_devinfo *dinfo;
148 	char *device, *host, *new_path = path;
149 
150 	parent = device_get_parent(dev);
151 	if (parent) {
152 		devclass = device_get_devclass(parent);
153 		if (devclass != NULL)
154 			name = devclass_get_name(devclass);
155 		if (name && strcmp(name, PCI_DEV) == 0) {
156 			dinfo = device_get_ivars(dev);
157 			if (dinfo) {
158 				device = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
159 				new_path = malloc(MAXPATHLEN, M_TEMP,
160 				    M_WAITOK);
161 				new_path[0] = '\000';
162 				strcpy(new_path, path);
163 				host = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
164 				device[0] = '\000';
165 				sprintf(device, "%s:%02x:%02x.%x",
166 				    prefix,
167 				    dinfo->cfg.bus,
168 				    dinfo->cfg.slot,
169 				    dinfo->cfg.func);
170 				strcat(new_path, "/");
171 				strcat(new_path, device);
172 				dir = pfs_create_dir(dir, device,
173 				    NULL, NULL, NULL, 0);
174 
175 				if (dinfo->cfg.baseclass == PCIC_STORAGE) {
176 					/* DJA only make this if needed */
177 					sprintf(host, "host%d", host_number++);
178 					strcat(new_path, "/");
179 					strcat(new_path, host);
180 					pfs_create_dir(dir, host,
181 					    NULL, NULL, NULL, 0);
182 					scsi_host = malloc(sizeof(
183 					    struct scsi_host_queue),
184 					    M_DEVBUF, M_NOWAIT);
185 					scsi_host->path = malloc(
186 					    strlen(new_path) + 1,
187 					    M_DEVBUF, M_NOWAIT);
188 					scsi_host->path[0] = '\000';
189 					bcopy(new_path, scsi_host->path,
190 					    strlen(new_path) + 1);
191 					scsi_host->name = "unknown";
192 
193 					sub_dir = pfs_create_dir(scsi, host,
194 					    NULL, NULL, NULL, 0);
195 					pfs_create_link(sub_dir, "device",
196 					    &linsysfs_link_scsi_host,
197 					    NULL, NULL, NULL, 0);
198 					pfs_create_file(sub_dir, "proc_name",
199 					    &linsysfs_scsiname,
200 					    NULL, NULL, NULL, PFS_RD);
201 					scsi_host->name
202 					    = linux_driver_get_name_dev(dev);
203 					TAILQ_INSERT_TAIL(&scsi_host_q,
204 					    scsi_host, scsi_host_next);
205 				}
206 				free(device, M_TEMP);
207 				free(host, M_TEMP);
208 			}
209 		}
210 	}
211 
212 	device_get_children(dev, &children, &nchildren);
213 	for (i = 0; i < nchildren; i++) {
214 		if (children[i])
215 			linsysfs_run_bus(children[i], dir, scsi, new_path, prefix);
216 	}
217 	if (new_path != path)
218 		free(new_path, M_TEMP);
219 
220 	return (1);
221 }
222 
223 /*
224  * Constructor
225  */
226 static int
227 linsysfs_init(PFS_INIT_ARGS)
228 {
229 	struct pfs_node *root;
230 	struct pfs_node *dir;
231 	struct pfs_node *pci;
232 	struct pfs_node *scsi;
233 	devclass_t devclass;
234 	device_t dev;
235 
236 	TAILQ_INIT(&scsi_host_q);
237 
238 	root = pi->pi_root;
239 
240 	/* /sys/class/... */
241 	scsi = pfs_create_dir(root, "class", NULL, NULL, NULL, 0);
242 	scsi = pfs_create_dir(scsi, "scsi_host", NULL, NULL, NULL, 0);
243 
244 	/* /sys/device */
245 	dir = pfs_create_dir(root, "devices", NULL, NULL, NULL, 0);
246 
247 	/* /sys/device/pci0000:00 */
248 	pci = pfs_create_dir(dir, "pci0000:00", NULL, NULL, NULL, 0);
249 
250 	devclass = devclass_find("root");
251 	if (devclass == NULL) {
252 		return (0);
253 	}
254 
255 	dev = devclass_get_device(devclass, 0);
256 	linsysfs_run_bus(dev, pci, scsi, "/pci0000:00", "0000");
257 	return (0);
258 }
259 
260 /*
261  * Destructor
262  */
263 static int
264 linsysfs_uninit(PFS_INIT_ARGS)
265 {
266 	struct scsi_host_queue *scsi_host, *scsi_host_tmp;
267 
268 	TAILQ_FOREACH_SAFE(scsi_host, &scsi_host_q, scsi_host_next,
269 	    scsi_host_tmp) {
270 		TAILQ_REMOVE(&scsi_host_q, scsi_host, scsi_host_next);
271 		free(scsi_host->path, M_TEMP);
272 		free(scsi_host, M_TEMP);
273 	}
274 
275 	return (0);
276 }
277 
278 PSEUDOFS(linsysfs, 1, 0);
279 #if defined(__amd64__)
280 MODULE_DEPEND(linsysfs, linux_common, 1, 1, 1);
281 #else
282 MODULE_DEPEND(linsysfs, linux, 1, 1, 1);
283 #endif
284