2 * $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
4 * Procfs interface for the PCI bus.
6 * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
9 #include <linux/init.h>
10 #include <linux/pci.h>
11 #include <linux/module.h>
12 #include <linux/proc_fs.h>
13 #include <linux/seq_file.h>
14 #include <linux/smp_lock.h>
16 #include <asm/uaccess.h>
17 #include <asm/byteorder.h>
20 static int proc_initialized; /* = 0 */
23 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
26 struct inode *inode = file->f_dentry->d_inode;
34 new = file->f_pos + off;
37 new = inode->i_size + off;
40 if (new < 0 || new > inode->i_size)
49 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
51 const struct inode *ino = file->f_dentry->d_inode;
52 const struct proc_dir_entry *dp = PDE(ino);
53 struct pci_dev *dev = dp->data;
54 unsigned int pos = *ppos;
55 unsigned int cnt, size;
58 * Normal users can read only the standardized portion of the
59 * configuration space as several chips lock up when trying to read
60 * undefined locations (think of Intel PIIX4 as a typical example).
63 if (capable(CAP_SYS_ADMIN))
65 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
74 if (pos + nbytes > size)
78 if (!access_ok(VERIFY_WRITE, buf, cnt))
81 if ((pos & 1) && cnt) {
83 pci_read_config_byte(dev, pos, &val);
90 if ((pos & 3) && cnt > 2) {
92 pci_read_config_word(dev, pos, &val);
93 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
101 pci_read_config_dword(dev, pos, &val);
102 __put_user(cpu_to_le32(val), (unsigned int __user *) buf);
110 pci_read_config_word(dev, pos, &val);
111 __put_user(cpu_to_le16(val), (unsigned short __user *) buf);
119 pci_read_config_byte(dev, pos, &val);
120 __put_user(val, buf);
131 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
133 const struct inode *ino = file->f_dentry->d_inode;
134 const struct proc_dir_entry *dp = PDE(ino);
135 struct pci_dev *dev = dp->data;
137 int size = dev->cfg_size;
144 if (pos + nbytes > size)
148 if (!access_ok(VERIFY_READ, buf, cnt))
151 if ((pos & 1) && cnt) {
153 __get_user(val, buf);
154 pci_write_config_byte(dev, pos, val);
160 if ((pos & 3) && cnt > 2) {
162 __get_user(val, (unsigned short __user *) buf);
163 pci_write_config_word(dev, pos, le16_to_cpu(val));
171 __get_user(val, (unsigned int __user *) buf);
172 pci_write_config_dword(dev, pos, le32_to_cpu(val));
180 __get_user(val, (unsigned short __user *) buf);
181 pci_write_config_word(dev, pos, le16_to_cpu(val));
189 __get_user(val, buf);
190 pci_write_config_byte(dev, pos, val);
200 struct pci_filp_private {
201 enum pci_mmap_state mmap_state;
205 static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
207 const struct proc_dir_entry *dp = PDE(inode);
208 struct pci_dev *dev = dp->data;
210 struct pci_filp_private *fpriv = file->private_data;
211 #endif /* HAVE_PCI_MMAP */
215 case PCIIOC_CONTROLLER:
216 ret = pci_domain_nr(dev->bus);
220 case PCIIOC_MMAP_IS_IO:
221 fpriv->mmap_state = pci_mmap_io;
224 case PCIIOC_MMAP_IS_MEM:
225 fpriv->mmap_state = pci_mmap_mem;
228 case PCIIOC_WRITE_COMBINE:
230 fpriv->write_combine = 1;
232 fpriv->write_combine = 0;
235 #endif /* HAVE_PCI_MMAP */
246 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
248 struct inode *inode = file->f_dentry->d_inode;
249 const struct proc_dir_entry *dp = PDE(inode);
250 struct pci_dev *dev = dp->data;
251 struct pci_filp_private *fpriv = file->private_data;
254 if (!capable(CAP_SYS_RAWIO))
257 ret = pci_mmap_page_range(dev, vma,
259 fpriv->write_combine);
266 static int proc_bus_pci_open(struct inode *inode, struct file *file)
268 struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);
273 fpriv->mmap_state = pci_mmap_io;
274 fpriv->write_combine = 0;
276 file->private_data = fpriv;
281 static int proc_bus_pci_release(struct inode *inode, struct file *file)
283 kfree(file->private_data);
284 file->private_data = NULL;
288 #endif /* HAVE_PCI_MMAP */
290 static struct file_operations proc_bus_pci_operations = {
291 .llseek = proc_bus_pci_lseek,
292 .read = proc_bus_pci_read,
293 .write = proc_bus_pci_write,
294 .ioctl = proc_bus_pci_ioctl,
296 .open = proc_bus_pci_open,
297 .release = proc_bus_pci_release,
298 .mmap = proc_bus_pci_mmap,
299 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
300 .get_unmapped_area = get_pci_unmapped_area,
301 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
302 #endif /* HAVE_PCI_MMAP */
305 #if BITS_PER_LONG == 32
306 #define LONG_FORMAT "\t%08lx"
308 #define LONG_FORMAT "\t%16lx"
312 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
314 struct pci_dev *dev = NULL;
317 for_each_pci_dev(dev) {
324 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
326 struct pci_dev *dev = v;
329 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
333 static void pci_seq_stop(struct seq_file *m, void *v)
336 struct pci_dev *dev = v;
341 static int show_device(struct seq_file *m, void *v)
343 const struct pci_dev *dev = v;
344 const struct pci_driver *drv;
350 drv = pci_dev_driver(dev);
351 seq_printf(m, "%02x%02x\t%04x%04x\t%x",
357 /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
358 for (i=0; i<7; i++) {
360 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
361 seq_printf(m, LONG_FORMAT,
362 ((unsigned long)start) |
363 (dev->resource[i].flags & PCI_REGION_FLAG_MASK));
365 for (i=0; i<7; i++) {
367 pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
368 seq_printf(m, LONG_FORMAT,
369 dev->resource[i].start < dev->resource[i].end ?
370 (unsigned long)(end - start) + 1 : 0);
374 seq_printf(m, "%s", drv->name);
379 static struct seq_operations proc_bus_pci_devices_op = {
380 .start = pci_seq_start,
381 .next = pci_seq_next,
382 .stop = pci_seq_stop,
386 static struct proc_dir_entry *proc_bus_pci_dir;
388 int pci_proc_attach_device(struct pci_dev *dev)
390 struct pci_bus *bus = dev->bus;
391 struct proc_dir_entry *e;
394 if (!proc_initialized)
398 if (pci_proc_domain(bus)) {
399 sprintf(name, "%04x:%02x", pci_domain_nr(bus),
402 sprintf(name, "%02x", bus->number);
404 bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
409 sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
410 e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
413 e->proc_fops = &proc_bus_pci_operations;
415 e->size = dev->cfg_size;
421 int pci_proc_detach_device(struct pci_dev *dev)
423 struct proc_dir_entry *e;
425 if ((e = dev->procent)) {
426 if (atomic_read(&e->count))
428 remove_proc_entry(e->name, dev->bus->procdir);
434 int pci_proc_attach_bus(struct pci_bus* bus)
436 struct proc_dir_entry *de = bus->procdir;
438 if (!proc_initialized)
443 sprintf(name, "%02x", bus->number);
444 de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
451 int pci_proc_detach_bus(struct pci_bus* bus)
453 struct proc_dir_entry *de = bus->procdir;
455 remove_proc_entry(de->name, proc_bus_pci_dir);
459 #ifdef CONFIG_PCI_LEGACY_PROC
462 * Backward compatible /proc/pci interface.
466 * Convert some of the configuration space registers of the device at
467 * address (bus,devfn) into a string (possibly several lines each).
468 * The configuration string is stored starting at buf[len]. If the
469 * string would exceed the size of the buffer (SIZE), 0 is returned.
471 static int show_dev_config(struct seq_file *m, void *v)
473 struct pci_dev *dev = v;
474 struct pci_dev *first_dev;
475 struct pci_driver *drv;
477 unsigned char latency, min_gnt, max_lat;
480 first_dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, NULL);
481 if (dev == first_dev)
482 seq_puts(m, "PCI devices found:\n");
483 pci_dev_put(first_dev);
485 drv = pci_dev_driver(dev);
487 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
488 pci_read_config_byte (dev, PCI_LATENCY_TIMER, &latency);
489 pci_read_config_byte (dev, PCI_MIN_GNT, &min_gnt);
490 pci_read_config_byte (dev, PCI_MAX_LAT, &max_lat);
491 seq_printf(m, " Bus %2d, device %3d, function %2d:\n",
492 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
493 seq_printf(m, " Class %04x", class_rev >> 16);
494 seq_printf(m, ": PCI device %04x:%04x", dev->vendor, dev->device);
495 seq_printf(m, " (rev %d).\n", class_rev & 0xff);
498 seq_printf(m, " IRQ %d.\n", dev->irq);
500 if (latency || min_gnt || max_lat) {
501 seq_printf(m, " Master Capable. ");
503 seq_printf(m, "Latency=%d. ", latency);
505 seq_puts(m, "No bursts. ");
507 seq_printf(m, "Min Gnt=%d.", min_gnt);
509 seq_printf(m, "Max Lat=%d.", max_lat);
513 for (reg = 0; reg < 6; reg++) {
514 struct resource *res = dev->resource + reg;
515 unsigned long base, end, flags;
523 if (flags & PCI_BASE_ADDRESS_SPACE_IO) {
524 seq_printf(m, " I/O at 0x%lx [0x%lx].\n",
527 const char *pref, *type = "unknown";
529 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
533 switch (flags & PCI_BASE_ADDRESS_MEM_TYPE_MASK) {
534 case PCI_BASE_ADDRESS_MEM_TYPE_32:
535 type = "32 bit"; break;
536 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
537 type = "20 bit"; break;
538 case PCI_BASE_ADDRESS_MEM_TYPE_64:
539 type = "64 bit"; break;
541 seq_printf(m, " %srefetchable %s memory at "
542 "0x%lx [0x%lx].\n", pref, type,
550 static struct seq_operations proc_pci_op = {
551 .start = pci_seq_start,
552 .next = pci_seq_next,
553 .stop = pci_seq_stop,
554 .show = show_dev_config
557 static int proc_pci_open(struct inode *inode, struct file *file)
559 return seq_open(file, &proc_pci_op);
561 static struct file_operations proc_pci_operations = {
562 .open = proc_pci_open,
565 .release = seq_release,
568 static void legacy_proc_init(void)
570 struct proc_dir_entry * entry = create_proc_entry("pci", 0, NULL);
572 entry->proc_fops = &proc_pci_operations;
577 static void legacy_proc_init(void)
582 #endif /* CONFIG_PCI_LEGACY_PROC */
584 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
586 return seq_open(file, &proc_bus_pci_devices_op);
588 static struct file_operations proc_bus_pci_dev_operations = {
589 .open = proc_bus_pci_dev_open,
592 .release = seq_release,
595 static int __init pci_proc_init(void)
597 struct proc_dir_entry *entry;
598 struct pci_dev *dev = NULL;
599 proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
600 entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
602 entry->proc_fops = &proc_bus_pci_dev_operations;
603 proc_initialized = 1;
604 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
605 pci_proc_attach_device(dev);
611 __initcall(pci_proc_init);
613 #ifdef CONFIG_HOTPLUG
614 EXPORT_SYMBOL(pci_proc_attach_device);
615 EXPORT_SYMBOL(pci_proc_attach_bus);
616 EXPORT_SYMBOL(pci_proc_detach_bus);