2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/cpumask.h>
12 #include <linux/pci-aspm.h>
13 #include <acpi/acpi_hest.h>
16 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
17 #define CARDBUS_RESERVE_BUSNR 3
19 /* Ugh. Need to stop exporting this to modules. */
20 LIST_HEAD(pci_root_buses);
21 EXPORT_SYMBOL(pci_root_buses);
24 static int find_anything(struct device *dev, void *data)
30 * Some device drivers need know if pci is initiated.
31 * Basically, we think pci is not initiated when there
32 * is no device to be found on the pci_bus_type.
34 int no_pci_devices(void)
39 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
40 no_devices = (dev == NULL);
44 EXPORT_SYMBOL(no_pci_devices);
47 * PCI Bus Class Devices
49 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
51 struct device_attribute *attr,
55 const struct cpumask *cpumask;
57 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
59 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
60 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
66 static ssize_t inline pci_bus_show_cpumaskaffinity(struct device *dev,
67 struct device_attribute *attr,
70 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
73 static ssize_t inline pci_bus_show_cpulistaffinity(struct device *dev,
74 struct device_attribute *attr,
77 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
80 DEVICE_ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL);
81 DEVICE_ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL);
86 static void release_pcibus_dev(struct device *dev)
88 struct pci_bus *pci_bus = to_pci_bus(dev);
91 put_device(pci_bus->bridge);
95 static struct class pcibus_class = {
97 .dev_release = &release_pcibus_dev,
100 static int __init pcibus_class_init(void)
102 return class_register(&pcibus_class);
104 postcore_initcall(pcibus_class_init);
107 * Translate the low bits of the PCI base
108 * to the resource type
110 static inline unsigned int pci_calc_resource_flags(unsigned int flags)
112 if (flags & PCI_BASE_ADDRESS_SPACE_IO)
113 return IORESOURCE_IO;
115 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
116 return IORESOURCE_MEM | IORESOURCE_PREFETCH;
118 return IORESOURCE_MEM;
121 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
123 u64 size = mask & maxbase; /* Find the significant bits */
127 /* Get the lowest of them to find the decode size, and
128 from that the extent. */
129 size = (size & ~(size-1)) - 1;
131 /* base == maxbase can be valid only if the BAR has
132 already been programmed with all 1s. */
133 if (base == maxbase && ((base | size) & mask) != mask)
139 static inline enum pci_bar_type decode_bar(struct resource *res, u32 bar)
141 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
142 res->flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
146 res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
148 if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
149 return pci_bar_mem64;
150 return pci_bar_mem32;
154 * pci_read_base - read a PCI BAR
155 * @dev: the PCI device
156 * @type: type of the BAR
157 * @res: resource buffer to be filled in
158 * @pos: BAR position in the config space
160 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
162 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
163 struct resource *res, unsigned int pos)
167 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
169 res->name = pci_name(dev);
171 pci_read_config_dword(dev, pos, &l);
172 pci_write_config_dword(dev, pos, l | mask);
173 pci_read_config_dword(dev, pos, &sz);
174 pci_write_config_dword(dev, pos, l);
177 * All bits set in sz means the device isn't working properly.
178 * If the BAR isn't implemented, all bits must be 0. If it's a
179 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
182 if (!sz || sz == 0xffffffff)
186 * I don't know how l can have all bits set. Copied from old code.
187 * Maybe it fixes a bug on some ancient platform.
192 if (type == pci_bar_unknown) {
193 type = decode_bar(res, l);
194 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
195 if (type == pci_bar_io) {
196 l &= PCI_BASE_ADDRESS_IO_MASK;
197 mask = PCI_BASE_ADDRESS_IO_MASK & IO_SPACE_LIMIT;
199 l &= PCI_BASE_ADDRESS_MEM_MASK;
200 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
203 res->flags |= (l & IORESOURCE_ROM_ENABLE);
204 l &= PCI_ROM_ADDRESS_MASK;
205 mask = (u32)PCI_ROM_ADDRESS_MASK;
208 if (type == pci_bar_mem64) {
211 u64 mask64 = mask | (u64)~0 << 32;
213 pci_read_config_dword(dev, pos + 4, &l);
214 pci_write_config_dword(dev, pos + 4, ~0);
215 pci_read_config_dword(dev, pos + 4, &sz);
216 pci_write_config_dword(dev, pos + 4, l);
218 l64 |= ((u64)l << 32);
219 sz64 |= ((u64)sz << 32);
221 sz64 = pci_size(l64, sz64, mask64);
226 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
227 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n",
232 res->flags |= IORESOURCE_MEM_64;
233 if ((sizeof(resource_size_t) < 8) && l) {
234 /* Address above 32-bit boundary; disable the BAR */
235 pci_write_config_dword(dev, pos, 0);
236 pci_write_config_dword(dev, pos + 4, 0);
241 res->end = l64 + sz64;
242 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n",
246 sz = pci_size(l, sz, mask);
254 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
258 return (type == pci_bar_mem64) ? 1 : 0;
264 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
266 unsigned int pos, reg;
268 for (pos = 0; pos < howmany; pos++) {
269 struct resource *res = &dev->resource[pos];
270 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
271 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
275 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
276 dev->rom_base_reg = rom;
277 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
278 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
279 IORESOURCE_SIZEALIGN;
280 __pci_read_base(dev, pci_bar_mem32, res, rom);
284 void __devinit pci_read_bridge_bases(struct pci_bus *child)
286 struct pci_dev *dev = child->self;
287 u8 io_base_lo, io_limit_lo;
288 u16 mem_base_lo, mem_limit_lo;
289 unsigned long base, limit;
290 struct resource *res;
293 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
296 dev_info(&dev->dev, "PCI bridge to [bus %02x-%02x]%s\n",
297 child->secondary, child->subordinate,
298 dev->transparent ? " (subtractive decode)": "");
300 if (dev->transparent) {
301 for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
302 child->resource[i] = child->parent->resource[i - 3];
305 res = child->resource[0];
306 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
307 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
308 base = (io_base_lo & PCI_IO_RANGE_MASK) << 8;
309 limit = (io_limit_lo & PCI_IO_RANGE_MASK) << 8;
311 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
312 u16 io_base_hi, io_limit_hi;
313 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
314 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
315 base |= (io_base_hi << 16);
316 limit |= (io_limit_hi << 16);
319 if (base && base <= limit) {
320 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
324 res->end = limit + 0xfff;
325 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
327 dev_printk(KERN_DEBUG, &dev->dev,
328 " bridge window [io %04lx - %04lx] reg reading\n",
332 res = child->resource[1];
333 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
334 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
335 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
336 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
337 if (base && base <= limit) {
338 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
340 res->end = limit + 0xfffff;
341 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
343 dev_printk(KERN_DEBUG, &dev->dev,
344 " bridge window [mem 0x%08lx - 0x%08lx] reg reading\n",
345 base, limit + 0xfffff);
348 res = child->resource[2];
349 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
350 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
351 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
352 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
354 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
355 u32 mem_base_hi, mem_limit_hi;
356 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
357 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
360 * Some bridges set the base > limit by default, and some
361 * (broken) BIOSes do not initialize them. If we find
362 * this, just assume they are not being used.
364 if (mem_base_hi <= mem_limit_hi) {
365 #if BITS_PER_LONG == 64
366 base |= ((long) mem_base_hi) << 32;
367 limit |= ((long) mem_limit_hi) << 32;
369 if (mem_base_hi || mem_limit_hi) {
370 dev_err(&dev->dev, "can't handle 64-bit "
371 "address space for bridge\n");
377 if (base && base <= limit) {
378 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
379 IORESOURCE_MEM | IORESOURCE_PREFETCH;
380 if (res->flags & PCI_PREF_RANGE_TYPE_64)
381 res->flags |= IORESOURCE_MEM_64;
383 res->end = limit + 0xfffff;
384 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
386 dev_printk(KERN_DEBUG, &dev->dev,
387 " bridge window [mem 0x%08lx - %08lx pref] reg reading\n",
388 base, limit + 0xfffff);
392 static struct pci_bus * pci_alloc_bus(void)
396 b = kzalloc(sizeof(*b), GFP_KERNEL);
398 INIT_LIST_HEAD(&b->node);
399 INIT_LIST_HEAD(&b->children);
400 INIT_LIST_HEAD(&b->devices);
401 INIT_LIST_HEAD(&b->slots);
402 b->max_bus_speed = PCI_SPEED_UNKNOWN;
403 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
408 static unsigned char pcix_bus_speed[] = {
409 PCI_SPEED_UNKNOWN, /* 0 */
410 PCI_SPEED_66MHz_PCIX, /* 1 */
411 PCI_SPEED_100MHz_PCIX, /* 2 */
412 PCI_SPEED_133MHz_PCIX, /* 3 */
413 PCI_SPEED_UNKNOWN, /* 4 */
414 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
415 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
416 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
417 PCI_SPEED_UNKNOWN, /* 8 */
418 PCI_SPEED_66MHz_PCIX_266, /* 9 */
419 PCI_SPEED_100MHz_PCIX_266, /* A */
420 PCI_SPEED_133MHz_PCIX_266, /* B */
421 PCI_SPEED_UNKNOWN, /* C */
422 PCI_SPEED_66MHz_PCIX_533, /* D */
423 PCI_SPEED_100MHz_PCIX_533, /* E */
424 PCI_SPEED_133MHz_PCIX_533 /* F */
427 static unsigned char pcie_link_speed[] = {
428 PCI_SPEED_UNKNOWN, /* 0 */
429 PCIE_SPEED_2_5GT, /* 1 */
430 PCIE_SPEED_5_0GT, /* 2 */
431 PCIE_SPEED_8_0GT, /* 3 */
432 PCI_SPEED_UNKNOWN, /* 4 */
433 PCI_SPEED_UNKNOWN, /* 5 */
434 PCI_SPEED_UNKNOWN, /* 6 */
435 PCI_SPEED_UNKNOWN, /* 7 */
436 PCI_SPEED_UNKNOWN, /* 8 */
437 PCI_SPEED_UNKNOWN, /* 9 */
438 PCI_SPEED_UNKNOWN, /* A */
439 PCI_SPEED_UNKNOWN, /* B */
440 PCI_SPEED_UNKNOWN, /* C */
441 PCI_SPEED_UNKNOWN, /* D */
442 PCI_SPEED_UNKNOWN, /* E */
443 PCI_SPEED_UNKNOWN /* F */
446 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
448 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
450 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
452 static unsigned char agp_speeds[] = {
460 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
466 else if (agpstat & 2)
468 else if (agpstat & 1)
480 return agp_speeds[index];
484 static void pci_set_bus_speed(struct pci_bus *bus)
486 struct pci_dev *bridge = bus->self;
489 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
491 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
495 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
496 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
498 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
499 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
502 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
505 enum pci_bus_speed max;
506 pci_read_config_word(bridge, pos + 2, &status);
508 if (status & 0x8000) {
509 max = PCI_SPEED_133MHz_PCIX_533;
510 } else if (status & 0x4000) {
511 max = PCI_SPEED_133MHz_PCIX_266;
512 } else if (status & 0x0002) {
513 if (((status >> 12) & 0x3) == 2) {
514 max = PCI_SPEED_133MHz_PCIX_ECC;
516 max = PCI_SPEED_133MHz_PCIX;
519 max = PCI_SPEED_66MHz_PCIX;
522 bus->max_bus_speed = max;
523 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
528 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
533 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
534 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
536 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
537 pcie_update_link_speed(bus, linksta);
542 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
543 struct pci_dev *bridge, int busnr)
545 struct pci_bus *child;
549 * Allocate a new bus, and inherit stuff from the parent..
551 child = pci_alloc_bus();
555 child->parent = parent;
556 child->ops = parent->ops;
557 child->sysdata = parent->sysdata;
558 child->bus_flags = parent->bus_flags;
560 /* initialize some portions of the bus device, but don't register it
561 * now as the parent is not properly set up yet. This device will get
562 * registered later in pci_bus_add_devices()
564 child->dev.class = &pcibus_class;
565 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
568 * Set up the primary, secondary and subordinate
571 child->number = child->secondary = busnr;
572 child->primary = parent->secondary;
573 child->subordinate = 0xff;
578 child->self = bridge;
579 child->bridge = get_device(&bridge->dev);
581 pci_set_bus_speed(child);
583 /* Set up default resource pointers and names.. */
584 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
585 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
586 child->resource[i]->name = child->name;
588 bridge->subordinate = child;
593 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
595 struct pci_bus *child;
597 child = pci_alloc_child_bus(parent, dev, busnr);
599 down_write(&pci_bus_sem);
600 list_add_tail(&child->node, &parent->children);
601 up_write(&pci_bus_sem);
606 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
608 struct pci_bus *parent = child->parent;
610 /* Attempts to fix that up are really dangerous unless
611 we're going to re-assign all bus numbers. */
612 if (!pcibios_assign_all_busses())
615 while (parent->parent && parent->subordinate < max) {
616 parent->subordinate = max;
617 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
618 parent = parent->parent;
623 * If it's a bridge, configure it and scan the bus behind it.
624 * For CardBus bridges, we don't scan behind as the devices will
625 * be handled by the bridge driver itself.
627 * We need to process bridges in two passes -- first we scan those
628 * already configured by the BIOS and after we are done with all of
629 * them, we proceed to assigning numbers to the remaining buses in
630 * order to avoid overlaps between old and new bus numbers.
632 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
634 struct pci_bus *child;
635 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
640 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
642 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
643 buses & 0xffffff, pass);
645 /* Check if setup is sensible at all */
647 ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
648 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
652 /* Disable MasterAbortMode during probing to avoid reporting
653 of bus errors (in some architectures) */
654 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
655 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
656 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
658 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
659 unsigned int cmax, busnr;
661 * Bus already configured by firmware, process it in the first
662 * pass and just note the configuration.
666 busnr = (buses >> 8) & 0xFF;
669 * If we already got to this bus through a different bridge,
670 * don't re-add it. This can happen with the i450NX chipset.
672 * However, we continue to descend down the hierarchy and
673 * scan remaining child buses.
675 child = pci_find_bus(pci_domain_nr(bus), busnr);
677 child = pci_add_new_bus(bus, dev, busnr);
680 child->primary = buses & 0xFF;
681 child->subordinate = (buses >> 16) & 0xFF;
682 child->bridge_ctl = bctl;
685 cmax = pci_scan_child_bus(child);
688 if (child->subordinate > max)
689 max = child->subordinate;
692 * We need to assign a number to this bus which we always
693 * do in the second pass.
696 if (pcibios_assign_all_busses() || broken)
697 /* Temporarily disable forwarding of the
698 configuration cycles on all bridges in
699 this bus segment to avoid possible
700 conflicts in the second pass between two
701 bridges programmed with overlapping
703 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
709 pci_write_config_word(dev, PCI_STATUS, 0xffff);
711 /* Prevent assigning a bus number that already exists.
712 * This can happen when a bridge is hot-plugged */
713 if (pci_find_bus(pci_domain_nr(bus), max+1))
715 child = pci_add_new_bus(bus, dev, ++max);
716 buses = (buses & 0xff000000)
717 | ((unsigned int)(child->primary) << 0)
718 | ((unsigned int)(child->secondary) << 8)
719 | ((unsigned int)(child->subordinate) << 16);
722 * yenta.c forces a secondary latency timer of 176.
723 * Copy that behaviour here.
726 buses &= ~0xff000000;
727 buses |= CARDBUS_LATENCY_TIMER << 24;
731 * We need to blast all three values with a single write.
733 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
736 child->bridge_ctl = bctl;
738 * Adjust subordinate busnr in parent buses.
739 * We do this before scanning for children because
740 * some devices may not be detected if the bios
743 pci_fixup_parent_subordinate_busnr(child, max);
744 /* Now we can scan all subordinate buses... */
745 max = pci_scan_child_bus(child);
747 * now fix it up again since we have found
748 * the real value of max.
750 pci_fixup_parent_subordinate_busnr(child, max);
753 * For CardBus bridges, we leave 4 bus numbers
754 * as cards with a PCI-to-PCI bridge can be
757 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
758 struct pci_bus *parent = bus;
759 if (pci_find_bus(pci_domain_nr(bus),
762 while (parent->parent) {
763 if ((!pcibios_assign_all_busses()) &&
764 (parent->subordinate > max) &&
765 (parent->subordinate <= max+i)) {
768 parent = parent->parent;
772 * Often, there are two cardbus bridges
773 * -- try to leave one valid bus number
781 pci_fixup_parent_subordinate_busnr(child, max);
784 * Set the subordinate bus number to its real value.
786 child->subordinate = max;
787 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
791 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
792 pci_domain_nr(bus), child->number);
794 /* Has only triggered on CardBus, fixup is in yenta_socket */
795 while (bus->parent) {
796 if ((child->subordinate > bus->subordinate) ||
797 (child->number > bus->subordinate) ||
798 (child->number < bus->number) ||
799 (child->subordinate < bus->number)) {
800 dev_info(&child->dev, "[bus %02x-%02x] %s "
801 "hidden behind%s bridge %s [bus %02x-%02x]\n",
802 child->number, child->subordinate,
803 (bus->number > child->subordinate &&
804 bus->subordinate < child->number) ?
805 "wholly" : "partially",
806 bus->self->transparent ? " transparent" : "",
808 bus->number, bus->subordinate);
814 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
820 * Read interrupt line and base address registers.
821 * The architecture-dependent code can tweak these, of course.
823 static void pci_read_irq(struct pci_dev *dev)
827 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
830 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
834 void set_pcie_port_type(struct pci_dev *pdev)
839 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
843 pdev->pcie_cap = pos;
844 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
845 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
848 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
854 pos = pci_pcie_cap(pdev);
857 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
858 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
860 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
861 if (reg32 & PCI_EXP_SLTCAP_HPC)
862 pdev->is_hotplug_bridge = 1;
865 static void set_pci_aer_firmware_first(struct pci_dev *pdev)
867 if (acpi_hest_firmware_first_pci(pdev))
868 pdev->aer_firmware_first = 1;
871 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
874 * pci_setup_device - fill in class and map information of a device
875 * @dev: the device structure to fill
877 * Initialize the device structure with information about the device's
878 * vendor,class,memory and IO-space addresses,IRQ lines etc.
879 * Called at initialisation of the PCI subsystem and by CardBus services.
880 * Returns 0 on success and negative if unknown type of device (not normal,
881 * bridge or CardBus).
883 int pci_setup_device(struct pci_dev *dev)
887 struct pci_slot *slot;
890 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
893 dev->sysdata = dev->bus->sysdata;
894 dev->dev.parent = dev->bus->bridge;
895 dev->dev.bus = &pci_bus_type;
896 dev->hdr_type = hdr_type & 0x7f;
897 dev->multifunction = !!(hdr_type & 0x80);
898 dev->error_state = pci_channel_io_normal;
899 set_pcie_port_type(dev);
900 set_pci_aer_firmware_first(dev);
902 list_for_each_entry(slot, &dev->bus->slots, list)
903 if (PCI_SLOT(dev->devfn) == slot->number)
906 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
907 set this higher, assuming the system even supports it. */
908 dev->dma_mask = 0xffffffff;
910 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
911 dev->bus->number, PCI_SLOT(dev->devfn),
912 PCI_FUNC(dev->devfn));
914 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
915 dev->revision = class & 0xff;
916 class >>= 8; /* upper 3 bytes */
920 dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n",
921 dev->vendor, dev->device, class, dev->hdr_type);
923 /* need to have dev->class ready */
924 dev->cfg_size = pci_cfg_space_size(dev);
926 /* "Unknown power state" */
927 dev->current_state = PCI_UNKNOWN;
929 /* Early fixups, before probing the BARs */
930 pci_fixup_device(pci_fixup_early, dev);
931 /* device class may be changed after fixup */
932 class = dev->class >> 8;
934 switch (dev->hdr_type) { /* header type */
935 case PCI_HEADER_TYPE_NORMAL: /* standard header */
936 if (class == PCI_CLASS_BRIDGE_PCI)
939 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
940 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
941 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
944 * Do the ugly legacy mode stuff here rather than broken chip
945 * quirk code. Legacy mode ATA controllers have fixed
946 * addresses. These are not always echoed in BAR0-3, and
947 * BAR0-3 in a few cases contain junk!
949 if (class == PCI_CLASS_STORAGE_IDE) {
951 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
952 if ((progif & 1) == 0) {
953 dev->resource[0].start = 0x1F0;
954 dev->resource[0].end = 0x1F7;
955 dev->resource[0].flags = LEGACY_IO_RESOURCE;
956 dev->resource[1].start = 0x3F6;
957 dev->resource[1].end = 0x3F6;
958 dev->resource[1].flags = LEGACY_IO_RESOURCE;
960 if ((progif & 4) == 0) {
961 dev->resource[2].start = 0x170;
962 dev->resource[2].end = 0x177;
963 dev->resource[2].flags = LEGACY_IO_RESOURCE;
964 dev->resource[3].start = 0x376;
965 dev->resource[3].end = 0x376;
966 dev->resource[3].flags = LEGACY_IO_RESOURCE;
971 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
972 if (class != PCI_CLASS_BRIDGE_PCI)
974 /* The PCI-to-PCI bridge spec requires that subtractive
975 decoding (i.e. transparent) bridge must have programming
976 interface code of 0x01. */
978 dev->transparent = ((dev->class & 0xff) == 1);
979 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
980 set_pcie_hotplug_bridge(dev);
981 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
983 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
984 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
988 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
989 if (class != PCI_CLASS_BRIDGE_CARDBUS)
992 pci_read_bases(dev, 1, 0);
993 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
994 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
997 default: /* unknown header */
998 dev_err(&dev->dev, "unknown header type %02x, "
999 "ignoring device\n", dev->hdr_type);
1003 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
1004 "type %02x)\n", class, dev->hdr_type);
1005 dev->class = PCI_CLASS_NOT_DEFINED;
1008 /* We found a fine healthy device, go go go... */
1012 static void pci_release_capabilities(struct pci_dev *dev)
1014 pci_vpd_release(dev);
1015 pci_iov_release(dev);
1019 * pci_release_dev - free a pci device structure when all users of it are finished.
1020 * @dev: device that's been disconnected
1022 * Will be called only by the device core when all users of this pci device are
1025 static void pci_release_dev(struct device *dev)
1027 struct pci_dev *pci_dev;
1029 pci_dev = to_pci_dev(dev);
1030 pci_release_capabilities(pci_dev);
1035 * pci_cfg_space_size - get the configuration space size of the PCI device.
1038 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1039 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1040 * access it. Maybe we don't have a way to generate extended config space
1041 * accesses, or the device is behind a reverse Express bridge. So we try
1042 * reading the dword at 0x100 which must either be 0 or a valid extended
1043 * capability header.
1045 int pci_cfg_space_size_ext(struct pci_dev *dev)
1048 int pos = PCI_CFG_SPACE_SIZE;
1050 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1052 if (status == 0xffffffff)
1055 return PCI_CFG_SPACE_EXP_SIZE;
1058 return PCI_CFG_SPACE_SIZE;
1061 int pci_cfg_space_size(struct pci_dev *dev)
1067 class = dev->class >> 8;
1068 if (class == PCI_CLASS_BRIDGE_HOST)
1069 return pci_cfg_space_size_ext(dev);
1071 pos = pci_pcie_cap(dev);
1073 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1077 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1078 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1082 return pci_cfg_space_size_ext(dev);
1085 return PCI_CFG_SPACE_SIZE;
1088 static void pci_release_bus_bridge_dev(struct device *dev)
1093 struct pci_dev *alloc_pci_dev(void)
1095 struct pci_dev *dev;
1097 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1101 INIT_LIST_HEAD(&dev->bus_list);
1105 EXPORT_SYMBOL(alloc_pci_dev);
1108 * Read the config data for a PCI device, sanity-check it
1109 * and fill in the dev structure...
1111 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1113 struct pci_dev *dev;
1117 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1120 /* some broken boards return 0 or ~0 if a slot is empty: */
1121 if (l == 0xffffffff || l == 0x00000000 ||
1122 l == 0x0000ffff || l == 0xffff0000)
1125 /* Configuration request Retry Status */
1126 while (l == 0xffff0001) {
1129 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1131 /* Card hasn't responded in 60 seconds? Must be stuck. */
1132 if (delay > 60 * 1000) {
1133 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1134 "responding\n", pci_domain_nr(bus),
1135 bus->number, PCI_SLOT(devfn),
1141 dev = alloc_pci_dev();
1147 dev->vendor = l & 0xffff;
1148 dev->device = (l >> 16) & 0xffff;
1150 if (pci_setup_device(dev)) {
1158 static void pci_init_capabilities(struct pci_dev *dev)
1160 /* MSI/MSI-X list */
1161 pci_msi_init_pci_dev(dev);
1163 /* Buffers for saving PCIe and PCI-X capabilities */
1164 pci_allocate_cap_save_buffers(dev);
1166 /* Power Management */
1168 platform_pci_wakeup_init(dev);
1170 /* Vital Product Data */
1171 pci_vpd_pci22_init(dev);
1173 /* Alternative Routing-ID Forwarding */
1174 pci_enable_ari(dev);
1176 /* Single Root I/O Virtualization */
1179 /* Enable ACS P2P upstream forwarding */
1180 pci_enable_acs(dev);
1183 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1185 device_initialize(&dev->dev);
1186 dev->dev.release = pci_release_dev;
1189 dev->dev.dma_mask = &dev->dma_mask;
1190 dev->dev.dma_parms = &dev->dma_parms;
1191 dev->dev.coherent_dma_mask = 0xffffffffull;
1193 pci_set_dma_max_seg_size(dev, 65536);
1194 pci_set_dma_seg_boundary(dev, 0xffffffff);
1196 /* Fix up broken headers */
1197 pci_fixup_device(pci_fixup_header, dev);
1199 /* Clear the state_saved flag. */
1200 dev->state_saved = false;
1202 /* Initialize various capabilities */
1203 pci_init_capabilities(dev);
1206 * Add the device to our list of discovered devices
1207 * and the bus list for fixup functions, etc.
1209 down_write(&pci_bus_sem);
1210 list_add_tail(&dev->bus_list, &bus->devices);
1211 up_write(&pci_bus_sem);
1214 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1216 struct pci_dev *dev;
1218 dev = pci_get_slot(bus, devfn);
1224 dev = pci_scan_device(bus, devfn);
1228 pci_device_add(dev, bus);
1232 EXPORT_SYMBOL(pci_scan_single_device);
1234 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1237 unsigned pos, next_fn;
1242 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1245 pci_read_config_word(dev, pos + 4, &cap);
1252 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1254 return (fn + 1) % 8;
1257 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1262 static int only_one_child(struct pci_bus *bus)
1264 struct pci_dev *parent = bus->self;
1265 if (!parent || !pci_is_pcie(parent))
1267 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
1268 parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
1274 * pci_scan_slot - scan a PCI slot on a bus for devices.
1275 * @bus: PCI bus to scan
1276 * @devfn: slot number to scan (must have zero function.)
1278 * Scan a PCI slot on the specified PCI bus for devices, adding
1279 * discovered devices to the @bus->devices list. New devices
1280 * will not have is_added set.
1282 * Returns the number of new devices found.
1284 int pci_scan_slot(struct pci_bus *bus, int devfn)
1286 unsigned fn, nr = 0;
1287 struct pci_dev *dev;
1288 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1290 if (only_one_child(bus) && (devfn > 0))
1291 return 0; /* Already scanned the entire slot */
1293 dev = pci_scan_single_device(bus, devfn);
1299 if (pci_ari_enabled(bus))
1300 next_fn = next_ari_fn;
1301 else if (dev->multifunction)
1302 next_fn = next_trad_fn;
1304 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1305 dev = pci_scan_single_device(bus, devfn + fn);
1309 dev->multifunction = 1;
1313 /* only one slot has pcie device */
1314 if (bus->self && nr)
1315 pcie_aspm_init_link_state(bus->self);
1320 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1322 unsigned int devfn, pass, max = bus->secondary;
1323 struct pci_dev *dev;
1325 dev_dbg(&bus->dev, "scanning bus\n");
1327 /* Go find them, Rover! */
1328 for (devfn = 0; devfn < 0x100; devfn += 8)
1329 pci_scan_slot(bus, devfn);
1331 /* Reserve buses for SR-IOV capability. */
1332 max += pci_iov_bus_range(bus);
1335 * After performing arch-dependent fixup of the bus, look behind
1336 * all PCI-to-PCI bridges on this bus.
1338 if (!bus->is_added) {
1339 dev_dbg(&bus->dev, "fixups for bus\n");
1340 pcibios_fixup_bus(bus);
1341 if (pci_is_root_bus(bus))
1345 for (pass=0; pass < 2; pass++)
1346 list_for_each_entry(dev, &bus->devices, bus_list) {
1347 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1348 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1349 max = pci_scan_bridge(bus, dev, max, pass);
1353 * We've scanned the bus and so we know all about what's on
1354 * the other side of any bridges that may be on this bus plus
1357 * Return how far we've got finding sub-buses.
1359 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1363 struct pci_bus * pci_create_bus(struct device *parent,
1364 int bus, struct pci_ops *ops, void *sysdata)
1367 struct pci_bus *b, *b2;
1370 b = pci_alloc_bus();
1374 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1380 b->sysdata = sysdata;
1383 b2 = pci_find_bus(pci_domain_nr(b), bus);
1385 /* If we already got to this bus through a different bridge, ignore it */
1386 dev_dbg(&b2->dev, "bus already known\n");
1390 down_write(&pci_bus_sem);
1391 list_add_tail(&b->node, &pci_root_buses);
1392 up_write(&pci_bus_sem);
1394 dev->parent = parent;
1395 dev->release = pci_release_bus_bridge_dev;
1396 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1397 error = device_register(dev);
1400 b->bridge = get_device(dev);
1403 set_dev_node(b->bridge, pcibus_to_node(b));
1405 b->dev.class = &pcibus_class;
1406 b->dev.parent = b->bridge;
1407 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1408 error = device_register(&b->dev);
1410 goto class_dev_reg_err;
1411 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1413 goto dev_create_file_err;
1415 /* Create legacy_io and legacy_mem files for this bus */
1416 pci_create_legacy_files(b);
1418 b->number = b->secondary = bus;
1419 b->resource[0] = &ioport_resource;
1420 b->resource[1] = &iomem_resource;
1424 dev_create_file_err:
1425 device_unregister(&b->dev);
1427 device_unregister(dev);
1429 down_write(&pci_bus_sem);
1431 up_write(&pci_bus_sem);
1438 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1439 int bus, struct pci_ops *ops, void *sysdata)
1443 b = pci_create_bus(parent, bus, ops, sysdata);
1445 b->subordinate = pci_scan_child_bus(b);
1448 EXPORT_SYMBOL(pci_scan_bus_parented);
1450 #ifdef CONFIG_HOTPLUG
1452 * pci_rescan_bus - scan a PCI bus for devices.
1453 * @bus: PCI bus to scan
1455 * Scan a PCI bus and child buses for new devices, adds them,
1458 * Returns the max number of subordinate bus discovered.
1460 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1463 struct pci_dev *dev;
1465 max = pci_scan_child_bus(bus);
1467 down_read(&pci_bus_sem);
1468 list_for_each_entry(dev, &bus->devices, bus_list)
1469 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1470 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1471 if (dev->subordinate)
1472 pci_bus_size_bridges(dev->subordinate);
1473 up_read(&pci_bus_sem);
1475 pci_bus_assign_resources(bus);
1476 pci_enable_bridges(bus);
1477 pci_bus_add_devices(bus);
1481 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1483 EXPORT_SYMBOL(pci_add_new_bus);
1484 EXPORT_SYMBOL(pci_scan_slot);
1485 EXPORT_SYMBOL(pci_scan_bridge);
1486 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1489 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1491 const struct pci_dev *a = to_pci_dev(d_a);
1492 const struct pci_dev *b = to_pci_dev(d_b);
1494 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1495 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1497 if (a->bus->number < b->bus->number) return -1;
1498 else if (a->bus->number > b->bus->number) return 1;
1500 if (a->devfn < b->devfn) return -1;
1501 else if (a->devfn > b->devfn) return 1;
1506 void __init pci_sort_breadthfirst(void)
1508 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);