2 * The PCI Library -- Configuration Access via /sys/bus/pci
4 * Copyright (c) 2003 Matthew Wilcox <matthew@wil.cx>
5 * Copyright (c) 1997--2008 Martin Mares <mj@ucw.cz>
7 * Can be freely distributed and used under the terms of the GNU GPL.
20 #include <sys/types.h>
26 sysfs_config(struct pci_access *a)
28 pci_define_param(a, "sysfs.path", PCI_PATH_SYS_BUS_PCI, "Path to the sysfs device tree");
32 sysfs_name(struct pci_access *a)
34 return pci_get_param(a, "sysfs.path");
38 sysfs_detect(struct pci_access *a)
40 if (access(sysfs_name(a), R_OK))
42 a->debug("...cannot open %s", sysfs_name(a));
45 a->debug("...using %s", sysfs_name(a));
50 sysfs_init(struct pci_access *a)
57 sysfs_flush_cache(struct pci_access *a)
73 sysfs_cleanup(struct pci_access *a)
78 #define OBJNAMELEN 1024
80 sysfs_obj_name(struct pci_dev *d, char *object, char *buf)
82 int n = snprintf(buf, OBJNAMELEN, "%s/devices/%04x:%02x:%02x.%d/%s",
83 sysfs_name(d->access), d->domain, d->bus, d->dev, d->func, object);
84 if (n < 0 || n >= OBJNAMELEN)
85 d->access->error("File name too long");
88 #define OBJBUFSIZE 1024
91 sysfs_get_string(struct pci_dev *d, char *object, char *buf, int mandatory)
93 struct pci_access *a = d->access;
95 char namebuf[OBJNAMELEN];
97 sysfs_obj_name(d, object, namebuf);
98 fd = open(namebuf, O_RDONLY);
102 a->error("Cannot open %s: %s", namebuf, strerror(errno));
105 n = read(fd, buf, OBJBUFSIZE);
108 a->error("Error reading %s: %s", namebuf, strerror(errno));
110 a->error("Value in %s too long", namebuf);
116 sysfs_get_value(struct pci_dev *d, char *object)
118 char buf[OBJBUFSIZE];
120 sysfs_get_string(d, object, buf, 1);
121 return strtol(buf, NULL, 0);
125 sysfs_get_resources(struct pci_dev *d)
127 struct pci_access *a = d->access;
128 char namebuf[OBJNAMELEN], buf[256];
132 sysfs_obj_name(d, "resource", namebuf);
133 file = fopen(namebuf, "r");
135 a->error("Cannot open %s: %s", namebuf, strerror(errno));
136 for (i = 0; i < 7; i++)
138 unsigned long long start, end, size, flags;
139 if (!fgets(buf, sizeof(buf), file))
141 if (sscanf(buf, "%llx %llx %llx", &start, &end, &flags) != 3)
142 a->error("Syntax error in %s", namebuf);
144 size = end - start + 1;
147 flags &= PCI_ADDR_FLAG_MASK;
150 d->base_addr[i] = start | flags;
155 d->rom_base_addr = start | flags;
162 static void sysfs_scan(struct pci_access *a)
166 struct dirent *entry;
169 n = snprintf(dirname, sizeof(dirname), "%s/devices", sysfs_name(a));
170 if (n < 0 || n >= (int) sizeof(dirname))
171 a->error("Directory name too long");
172 dir = opendir(dirname);
174 a->error("Cannot open %s", dirname);
175 while ((entry = readdir(dir)))
178 unsigned int dom, bus, dev, func;
180 /* ".", ".." or a special non-device perhaps */
181 if (entry->d_name[0] == '.')
184 d = pci_alloc_dev(a);
185 if (sscanf(entry->d_name, "%x:%x:%x.%d", &dom, &bus, &dev, &func) < 4)
186 a->error("sysfs_scan: Couldn't parse entry name %s", entry->d_name);
193 sysfs_get_resources(d);
194 d->irq = sysfs_get_value(d, "irq");
196 * We could read these faster from the config registers, but we want to give
197 * the kernel a chance to fix up ID's and especially classes of broken devices.
199 d->vendor_id = sysfs_get_value(d, "vendor");
200 d->device_id = sysfs_get_value(d, "device");
201 d->device_class = sysfs_get_value(d, "class") >> 8;
203 if (sysfs_get_string(d, "label", buf, 0))
204 d->label = pci_strdup(d->access, buf);
206 d->known_fields = PCI_FILL_IDENT | PCI_FILL_CLASS | PCI_FILL_IRQ | PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES;
214 sysfs_fill_slots(struct pci_access *a)
218 struct dirent *entry;
221 n = snprintf(dirname, sizeof(dirname), "%s/slots", sysfs_name(a));
222 if (n < 0 || n >= (int) sizeof(dirname))
223 a->error("Directory name too long");
224 dir = opendir(dirname);
228 while (entry = readdir(dir))
230 char namebuf[OBJNAMELEN], buf[16];
232 unsigned int dom, bus, dev;
236 /* ".", ".." or a special non-device perhaps */
237 if (entry->d_name[0] == '.')
240 n = snprintf(namebuf, OBJNAMELEN, "%s/%s/%s", dirname, entry->d_name, "address");
241 if (n < 0 || n >= OBJNAMELEN)
242 a->error("File name too long");
243 file = fopen(namebuf, "r");
245 * Old versions of Linux had a fakephp which didn't have an 'address'
246 * file. There's no useful information to be gleaned from these
247 * devices, pretend they're not there.
252 if (!fgets(buf, sizeof(buf), file) || (res = sscanf(buf, "%x:%x:%x", &dom, &bus, &dev)) < 3)
255 * In some cases, the slot is not tied to a specific device before
256 * a card gets inserted. This happens for example on IBM pSeries
257 * and we need not warn about it.
260 a->warning("sysfs_fill_slots: Couldn't parse entry address %s", buf);
264 for (d = a->devices; d; d = d->next)
265 if (dom == d->domain && bus == d->bus && dev == d->dev && !d->phy_slot)
266 d->phy_slot = pci_strdup(a, entry->d_name);
274 sysfs_fill_info(struct pci_dev *d, int flags)
276 if ((flags & PCI_FILL_PHYS_SLOT) && !(d->known_fields & PCI_FILL_PHYS_SLOT))
279 sysfs_fill_slots(d->access);
280 for (pd = d->access->devices; pd; pd = pd->next)
281 pd->known_fields |= PCI_FILL_PHYS_SLOT;
284 if ((flags & PCI_FILL_MODULE_ALIAS) && !(d->known_fields & PCI_FILL_MODULE_ALIAS))
286 char buf[OBJBUFSIZE];
287 if (sysfs_get_string(d, "modalias", buf, 0))
288 d->module_alias = pci_strdup(d->access, buf);
291 return pci_generic_fill_info(d, flags);
294 /* Intent of the sysfs_setup() caller */
297 SETUP_READ_CONFIG = 0,
298 SETUP_WRITE_CONFIG = 1,
303 sysfs_setup(struct pci_dev *d, int intent)
305 struct pci_access *a = d->access;
306 char namebuf[OBJNAMELEN];
308 if (a->cached_dev != d || (intent == SETUP_WRITE_CONFIG && !a->fd_rw))
310 sysfs_flush_cache(a);
314 if (intent == SETUP_READ_VPD)
318 sysfs_obj_name(d, "vpd", namebuf);
319 a->fd_vpd = open(namebuf, O_RDONLY);
320 /* No warning on error; vpd may be absent or accessible only to root */
327 sysfs_obj_name(d, "config", namebuf);
328 a->fd_rw = a->writeable || intent == SETUP_WRITE_CONFIG;
329 a->fd = open(namebuf, a->fd_rw ? O_RDWR : O_RDONLY);
331 a->warning("Cannot open %s", namebuf);
337 static int sysfs_read(struct pci_dev *d, int pos, byte *buf, int len)
339 int fd = sysfs_setup(d, SETUP_READ_CONFIG);
344 res = do_read(d, fd, buf, len, pos);
347 d->access->warning("sysfs_read: read failed: %s", strerror(errno));
355 static int sysfs_write(struct pci_dev *d, int pos, byte *buf, int len)
357 int fd = sysfs_setup(d, SETUP_WRITE_CONFIG);
362 res = do_write(d, fd, buf, len, pos);
365 d->access->warning("sysfs_write: write failed: %s", strerror(errno));
370 d->access->warning("sysfs_write: tried to write %d bytes at %d, but only %d succeeded", len, pos, res);
376 #ifdef PCI_HAVE_DO_READ
378 /* pread() is not available and do_read() only works for a single fd, so we
379 * cannot implement read_vpd properly. */
380 static int sysfs_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
385 #else /* !PCI_HAVE_DO_READ */
387 static int sysfs_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
389 int fd = sysfs_setup(d, SETUP_READ_VPD);
394 res = pread(fd, buf, len, pos);
397 d->access->warning("sysfs_read_vpd: read failed: %s", strerror(errno));
405 #endif /* PCI_HAVE_DO_READ */
407 static void sysfs_cleanup_dev(struct pci_dev *d)
409 struct pci_access *a = d->access;
411 if (a->cached_dev == d)
412 sysfs_flush_cache(a);
415 struct pci_methods pm_linux_sysfs = {
417 "The sys filesystem on Linux",