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];
96 void (*warn)(char *msg, ...) = (mandatory ? a->error : a->warning);
98 sysfs_obj_name(d, object, namebuf);
99 fd = open(namebuf, O_RDONLY);
102 if (mandatory || errno != ENOENT)
103 warn("Cannot open %s: %s", namebuf, strerror(errno));
106 n = read(fd, buf, OBJBUFSIZE);
110 warn("Error reading %s: %s", namebuf, strerror(errno));
115 warn("Value in %s too long", namebuf);
123 sysfs_get_value(struct pci_dev *d, char *object, int mandatory)
125 char buf[OBJBUFSIZE];
127 if (sysfs_get_string(d, object, buf, mandatory))
128 return strtol(buf, NULL, 0);
134 sysfs_get_resources(struct pci_dev *d)
136 struct pci_access *a = d->access;
137 char namebuf[OBJNAMELEN], buf[256];
141 sysfs_obj_name(d, "resource", namebuf);
142 file = fopen(namebuf, "r");
144 a->error("Cannot open %s: %s", namebuf, strerror(errno));
145 for (i = 0; i < 7; i++)
147 unsigned long long start, end, size, flags;
148 if (!fgets(buf, sizeof(buf), file))
150 if (sscanf(buf, "%llx %llx %llx", &start, &end, &flags) != 3)
151 a->error("Syntax error in %s", namebuf);
153 size = end - start + 1;
156 flags &= PCI_ADDR_FLAG_MASK;
159 d->base_addr[i] = start | flags;
164 d->rom_base_addr = start | flags;
171 static void sysfs_scan(struct pci_access *a)
175 struct dirent *entry;
178 n = snprintf(dirname, sizeof(dirname), "%s/devices", sysfs_name(a));
179 if (n < 0 || n >= (int) sizeof(dirname))
180 a->error("Directory name too long");
181 dir = opendir(dirname);
183 a->error("Cannot open %s", dirname);
184 while ((entry = readdir(dir)))
187 unsigned int dom, bus, dev, func;
189 /* ".", ".." or a special non-device perhaps */
190 if (entry->d_name[0] == '.')
193 d = pci_alloc_dev(a);
194 if (sscanf(entry->d_name, "%x:%x:%x.%d", &dom, &bus, &dev, &func) < 4)
195 a->error("sysfs_scan: Couldn't parse entry name %s", entry->d_name);
197 /* Ensure kernel provided domain that fits in a signed integer */
198 if (dom > 0x7fffffff)
199 a->error("sysfs_scan: invalid domain:%x", dom);
202 * The domain value is truncated to 16 bits and stored in the pci_dev
203 * structure's legacy 16-bit domain offset for compatibility with
204 * applications compiled with libpci pre-32 bit domains. Such
205 * applications may not work as expected if they are on a machine
206 * utilizing PCI domain numbers requiring more than 16 bits.
215 sysfs_get_resources(d);
216 d->irq = sysfs_get_value(d, "irq", 1);
218 * We could read these faster from the config registers, but we want to give
219 * the kernel a chance to fix up ID's and especially classes of broken devices.
221 d->vendor_id = sysfs_get_value(d, "vendor", 1);
222 d->device_id = sysfs_get_value(d, "device", 1);
223 d->device_class = sysfs_get_value(d, "class", 1) >> 8;
224 d->known_fields = PCI_FILL_IDENT | PCI_FILL_CLASS | PCI_FILL_IRQ | PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES;
232 sysfs_fill_slots(struct pci_access *a)
236 struct dirent *entry;
239 n = snprintf(dirname, sizeof(dirname), "%s/slots", sysfs_name(a));
240 if (n < 0 || n >= (int) sizeof(dirname))
241 a->error("Directory name too long");
242 dir = opendir(dirname);
246 while (entry = readdir(dir))
248 char namebuf[OBJNAMELEN], buf[16];
250 unsigned int dom, bus, dev;
254 /* ".", ".." or a special non-device perhaps */
255 if (entry->d_name[0] == '.')
258 n = snprintf(namebuf, OBJNAMELEN, "%s/%s/%s", dirname, entry->d_name, "address");
259 if (n < 0 || n >= OBJNAMELEN)
260 a->error("File name too long");
261 file = fopen(namebuf, "r");
263 * Old versions of Linux had a fakephp which didn't have an 'address'
264 * file. There's no useful information to be gleaned from these
265 * devices, pretend they're not there.
270 if (!fgets(buf, sizeof(buf), file) || (res = sscanf(buf, "%x:%x:%x", &dom, &bus, &dev)) < 3)
273 * In some cases, the slot is not tied to a specific device before
274 * a card gets inserted. This happens for example on IBM pSeries
275 * and we need not warn about it.
278 a->warning("sysfs_fill_slots: Couldn't parse entry address %s", buf);
282 for (d = a->devices; d; d = d->next)
283 if (dom == (unsigned)d->domain && bus == d->bus && dev == d->dev && !d->phy_slot)
284 d->phy_slot = pci_strdup(a, entry->d_name);
292 sysfs_fill_info(struct pci_dev *d, int flags)
294 if ((flags & PCI_FILL_PHYS_SLOT) && !(d->known_fields & PCI_FILL_PHYS_SLOT))
297 sysfs_fill_slots(d->access);
298 for (pd = d->access->devices; pd; pd = pd->next)
299 pd->known_fields |= PCI_FILL_PHYS_SLOT;
302 if ((flags & PCI_FILL_MODULE_ALIAS) && !(d->known_fields & PCI_FILL_MODULE_ALIAS))
304 char buf[OBJBUFSIZE];
305 if (sysfs_get_string(d, "modalias", buf, 0))
306 d->module_alias = pci_strdup(d->access, buf);
309 if ((flags & PCI_FILL_LABEL) && !(d->known_fields & PCI_FILL_LABEL))
311 char buf[OBJBUFSIZE];
312 if (sysfs_get_string(d, "label", buf, 0))
313 d->label = pci_strdup(d->access, buf);
316 if ((flags & PCI_FILL_NUMA_NODE) && !(d->known_fields & PCI_FILL_NUMA_NODE))
317 d->numa_node = sysfs_get_value(d, "numa_node", 0);
319 return pci_generic_fill_info(d, flags);
322 /* Intent of the sysfs_setup() caller */
325 SETUP_READ_CONFIG = 0,
326 SETUP_WRITE_CONFIG = 1,
331 sysfs_setup(struct pci_dev *d, int intent)
333 struct pci_access *a = d->access;
334 char namebuf[OBJNAMELEN];
336 if (a->cached_dev != d || (intent == SETUP_WRITE_CONFIG && !a->fd_rw))
338 sysfs_flush_cache(a);
342 if (intent == SETUP_READ_VPD)
346 sysfs_obj_name(d, "vpd", namebuf);
347 a->fd_vpd = open(namebuf, O_RDONLY);
348 /* No warning on error; vpd may be absent or accessible only to root */
355 sysfs_obj_name(d, "config", namebuf);
356 a->fd_rw = a->writeable || intent == SETUP_WRITE_CONFIG;
357 a->fd = open(namebuf, a->fd_rw ? O_RDWR : O_RDONLY);
359 a->warning("Cannot open %s", namebuf);
365 static int sysfs_read(struct pci_dev *d, int pos, byte *buf, int len)
367 int fd = sysfs_setup(d, SETUP_READ_CONFIG);
372 res = do_read(d, fd, buf, len, pos);
375 d->access->warning("sysfs_read: read failed: %s", strerror(errno));
383 static int sysfs_write(struct pci_dev *d, int pos, byte *buf, int len)
385 int fd = sysfs_setup(d, SETUP_WRITE_CONFIG);
390 res = do_write(d, fd, buf, len, pos);
393 d->access->warning("sysfs_write: write failed: %s", strerror(errno));
398 d->access->warning("sysfs_write: tried to write %d bytes at %d, but only %d succeeded", len, pos, res);
404 #ifdef PCI_HAVE_DO_READ
406 /* pread() is not available and do_read() only works for a single fd, so we
407 * cannot implement read_vpd properly. */
408 static int sysfs_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
413 #else /* !PCI_HAVE_DO_READ */
415 static int sysfs_read_vpd(struct pci_dev *d, int pos, byte *buf, int len)
417 int fd = sysfs_setup(d, SETUP_READ_VPD);
422 res = pread(fd, buf, len, pos);
425 d->access->warning("sysfs_read_vpd: read failed: %s", strerror(errno));
433 #endif /* PCI_HAVE_DO_READ */
435 static void sysfs_cleanup_dev(struct pci_dev *d)
437 struct pci_access *a = d->access;
439 if (a->cached_dev == d)
440 sysfs_flush_cache(a);
443 struct pci_methods pm_linux_sysfs = {
445 "The sys filesystem on Linux",