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);
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);
328 res = child->resource[1];
329 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
330 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
331 base = (mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
332 limit = (mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
334 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
336 res->end = limit + 0xfffff;
337 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
340 res = child->resource[2];
341 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
342 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
343 base = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
344 limit = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
346 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
347 u32 mem_base_hi, mem_limit_hi;
348 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
349 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
352 * Some bridges set the base > limit by default, and some
353 * (broken) BIOSes do not initialize them. If we find
354 * this, just assume they are not being used.
356 if (mem_base_hi <= mem_limit_hi) {
357 #if BITS_PER_LONG == 64
358 base |= ((long) mem_base_hi) << 32;
359 limit |= ((long) mem_limit_hi) << 32;
361 if (mem_base_hi || mem_limit_hi) {
362 dev_err(&dev->dev, "can't handle 64-bit "
363 "address space for bridge\n");
370 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
371 IORESOURCE_MEM | IORESOURCE_PREFETCH;
372 if (res->flags & PCI_PREF_RANGE_TYPE_64)
373 res->flags |= IORESOURCE_MEM_64;
375 res->end = limit + 0xfffff;
376 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
380 static struct pci_bus * pci_alloc_bus(void)
384 b = kzalloc(sizeof(*b), GFP_KERNEL);
386 INIT_LIST_HEAD(&b->node);
387 INIT_LIST_HEAD(&b->children);
388 INIT_LIST_HEAD(&b->devices);
389 INIT_LIST_HEAD(&b->slots);
390 b->max_bus_speed = PCI_SPEED_UNKNOWN;
391 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
396 static unsigned char pcix_bus_speed[] = {
397 PCI_SPEED_UNKNOWN, /* 0 */
398 PCI_SPEED_66MHz_PCIX, /* 1 */
399 PCI_SPEED_100MHz_PCIX, /* 2 */
400 PCI_SPEED_133MHz_PCIX, /* 3 */
401 PCI_SPEED_UNKNOWN, /* 4 */
402 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
403 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
404 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
405 PCI_SPEED_UNKNOWN, /* 8 */
406 PCI_SPEED_66MHz_PCIX_266, /* 9 */
407 PCI_SPEED_100MHz_PCIX_266, /* A */
408 PCI_SPEED_133MHz_PCIX_266, /* B */
409 PCI_SPEED_UNKNOWN, /* C */
410 PCI_SPEED_66MHz_PCIX_533, /* D */
411 PCI_SPEED_100MHz_PCIX_533, /* E */
412 PCI_SPEED_133MHz_PCIX_533 /* F */
415 static unsigned char pcie_link_speed[] = {
416 PCI_SPEED_UNKNOWN, /* 0 */
417 PCIE_SPEED_2_5GT, /* 1 */
418 PCIE_SPEED_5_0GT, /* 2 */
419 PCIE_SPEED_8_0GT, /* 3 */
420 PCI_SPEED_UNKNOWN, /* 4 */
421 PCI_SPEED_UNKNOWN, /* 5 */
422 PCI_SPEED_UNKNOWN, /* 6 */
423 PCI_SPEED_UNKNOWN, /* 7 */
424 PCI_SPEED_UNKNOWN, /* 8 */
425 PCI_SPEED_UNKNOWN, /* 9 */
426 PCI_SPEED_UNKNOWN, /* A */
427 PCI_SPEED_UNKNOWN, /* B */
428 PCI_SPEED_UNKNOWN, /* C */
429 PCI_SPEED_UNKNOWN, /* D */
430 PCI_SPEED_UNKNOWN, /* E */
431 PCI_SPEED_UNKNOWN /* F */
434 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
436 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
438 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
440 static unsigned char agp_speeds[] = {
448 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
454 else if (agpstat & 2)
456 else if (agpstat & 1)
468 return agp_speeds[index];
472 static void pci_set_bus_speed(struct pci_bus *bus)
474 struct pci_dev *bridge = bus->self;
477 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
479 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
483 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
484 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
486 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
487 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
490 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
493 enum pci_bus_speed max;
494 pci_read_config_word(bridge, pos + 2, &status);
496 if (status & 0x8000) {
497 max = PCI_SPEED_133MHz_PCIX_533;
498 } else if (status & 0x4000) {
499 max = PCI_SPEED_133MHz_PCIX_266;
500 } else if (status & 0x0002) {
501 if (((status >> 12) & 0x3) == 2) {
502 max = PCI_SPEED_133MHz_PCIX_ECC;
504 max = PCI_SPEED_133MHz_PCIX;
507 max = PCI_SPEED_66MHz_PCIX;
510 bus->max_bus_speed = max;
511 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
516 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
521 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
522 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
524 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
525 pcie_update_link_speed(bus, linksta);
530 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
531 struct pci_dev *bridge, int busnr)
533 struct pci_bus *child;
537 * Allocate a new bus, and inherit stuff from the parent..
539 child = pci_alloc_bus();
543 child->parent = parent;
544 child->ops = parent->ops;
545 child->sysdata = parent->sysdata;
546 child->bus_flags = parent->bus_flags;
548 /* initialize some portions of the bus device, but don't register it
549 * now as the parent is not properly set up yet. This device will get
550 * registered later in pci_bus_add_devices()
552 child->dev.class = &pcibus_class;
553 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
556 * Set up the primary, secondary and subordinate
559 child->number = child->secondary = busnr;
560 child->primary = parent->secondary;
561 child->subordinate = 0xff;
566 child->self = bridge;
567 child->bridge = get_device(&bridge->dev);
569 pci_set_bus_speed(child);
571 /* Set up default resource pointers and names.. */
572 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
573 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
574 child->resource[i]->name = child->name;
576 bridge->subordinate = child;
581 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
583 struct pci_bus *child;
585 child = pci_alloc_child_bus(parent, dev, busnr);
587 down_write(&pci_bus_sem);
588 list_add_tail(&child->node, &parent->children);
589 up_write(&pci_bus_sem);
594 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
596 struct pci_bus *parent = child->parent;
598 /* Attempts to fix that up are really dangerous unless
599 we're going to re-assign all bus numbers. */
600 if (!pcibios_assign_all_busses())
603 while (parent->parent && parent->subordinate < max) {
604 parent->subordinate = max;
605 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
606 parent = parent->parent;
611 * If it's a bridge, configure it and scan the bus behind it.
612 * For CardBus bridges, we don't scan behind as the devices will
613 * be handled by the bridge driver itself.
615 * We need to process bridges in two passes -- first we scan those
616 * already configured by the BIOS and after we are done with all of
617 * them, we proceed to assigning numbers to the remaining buses in
618 * order to avoid overlaps between old and new bus numbers.
620 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
622 struct pci_bus *child;
623 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
628 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
630 dev_dbg(&dev->dev, "scanning behind bridge, config %06x, pass %d\n",
631 buses & 0xffffff, pass);
633 /* Check if setup is sensible at all */
635 ((buses & 0xff) != bus->number || ((buses >> 8) & 0xff) <= bus->number)) {
636 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
640 /* Disable MasterAbortMode during probing to avoid reporting
641 of bus errors (in some architectures) */
642 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
643 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
644 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
646 if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus && !broken) {
647 unsigned int cmax, busnr;
649 * Bus already configured by firmware, process it in the first
650 * pass and just note the configuration.
654 busnr = (buses >> 8) & 0xFF;
657 * If we already got to this bus through a different bridge,
658 * don't re-add it. This can happen with the i450NX chipset.
660 * However, we continue to descend down the hierarchy and
661 * scan remaining child buses.
663 child = pci_find_bus(pci_domain_nr(bus), busnr);
665 child = pci_add_new_bus(bus, dev, busnr);
668 child->primary = buses & 0xFF;
669 child->subordinate = (buses >> 16) & 0xFF;
670 child->bridge_ctl = bctl;
673 cmax = pci_scan_child_bus(child);
676 if (child->subordinate > max)
677 max = child->subordinate;
680 * We need to assign a number to this bus which we always
681 * do in the second pass.
684 if (pcibios_assign_all_busses() || broken)
685 /* Temporarily disable forwarding of the
686 configuration cycles on all bridges in
687 this bus segment to avoid possible
688 conflicts in the second pass between two
689 bridges programmed with overlapping
691 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
697 pci_write_config_word(dev, PCI_STATUS, 0xffff);
699 /* Prevent assigning a bus number that already exists.
700 * This can happen when a bridge is hot-plugged */
701 if (pci_find_bus(pci_domain_nr(bus), max+1))
703 child = pci_add_new_bus(bus, dev, ++max);
704 buses = (buses & 0xff000000)
705 | ((unsigned int)(child->primary) << 0)
706 | ((unsigned int)(child->secondary) << 8)
707 | ((unsigned int)(child->subordinate) << 16);
710 * yenta.c forces a secondary latency timer of 176.
711 * Copy that behaviour here.
714 buses &= ~0xff000000;
715 buses |= CARDBUS_LATENCY_TIMER << 24;
719 * We need to blast all three values with a single write.
721 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
724 child->bridge_ctl = bctl;
726 * Adjust subordinate busnr in parent buses.
727 * We do this before scanning for children because
728 * some devices may not be detected if the bios
731 pci_fixup_parent_subordinate_busnr(child, max);
732 /* Now we can scan all subordinate buses... */
733 max = pci_scan_child_bus(child);
735 * now fix it up again since we have found
736 * the real value of max.
738 pci_fixup_parent_subordinate_busnr(child, max);
741 * For CardBus bridges, we leave 4 bus numbers
742 * as cards with a PCI-to-PCI bridge can be
745 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
746 struct pci_bus *parent = bus;
747 if (pci_find_bus(pci_domain_nr(bus),
750 while (parent->parent) {
751 if ((!pcibios_assign_all_busses()) &&
752 (parent->subordinate > max) &&
753 (parent->subordinate <= max+i)) {
756 parent = parent->parent;
760 * Often, there are two cardbus bridges
761 * -- try to leave one valid bus number
769 pci_fixup_parent_subordinate_busnr(child, max);
772 * Set the subordinate bus number to its real value.
774 child->subordinate = max;
775 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
779 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
780 pci_domain_nr(bus), child->number);
782 /* Has only triggered on CardBus, fixup is in yenta_socket */
783 while (bus->parent) {
784 if ((child->subordinate > bus->subordinate) ||
785 (child->number > bus->subordinate) ||
786 (child->number < bus->number) ||
787 (child->subordinate < bus->number)) {
788 dev_info(&child->dev, "[bus %02x-%02x] %s "
789 "hidden behind%s bridge %s [bus %02x-%02x]\n",
790 child->number, child->subordinate,
791 (bus->number > child->subordinate &&
792 bus->subordinate < child->number) ?
793 "wholly" : "partially",
794 bus->self->transparent ? " transparent" : "",
796 bus->number, bus->subordinate);
802 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
808 * Read interrupt line and base address registers.
809 * The architecture-dependent code can tweak these, of course.
811 static void pci_read_irq(struct pci_dev *dev)
815 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
818 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
822 void set_pcie_port_type(struct pci_dev *pdev)
827 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
831 pdev->pcie_cap = pos;
832 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
833 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
836 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
842 pos = pci_pcie_cap(pdev);
845 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
846 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
848 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
849 if (reg32 & PCI_EXP_SLTCAP_HPC)
850 pdev->is_hotplug_bridge = 1;
853 static void set_pci_aer_firmware_first(struct pci_dev *pdev)
855 if (acpi_hest_firmware_first_pci(pdev))
856 pdev->aer_firmware_first = 1;
859 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
862 * pci_setup_device - fill in class and map information of a device
863 * @dev: the device structure to fill
865 * Initialize the device structure with information about the device's
866 * vendor,class,memory and IO-space addresses,IRQ lines etc.
867 * Called at initialisation of the PCI subsystem and by CardBus services.
868 * Returns 0 on success and negative if unknown type of device (not normal,
869 * bridge or CardBus).
871 int pci_setup_device(struct pci_dev *dev)
875 struct pci_slot *slot;
878 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
881 dev->sysdata = dev->bus->sysdata;
882 dev->dev.parent = dev->bus->bridge;
883 dev->dev.bus = &pci_bus_type;
884 dev->hdr_type = hdr_type & 0x7f;
885 dev->multifunction = !!(hdr_type & 0x80);
886 dev->error_state = pci_channel_io_normal;
887 set_pcie_port_type(dev);
888 set_pci_aer_firmware_first(dev);
890 list_for_each_entry(slot, &dev->bus->slots, list)
891 if (PCI_SLOT(dev->devfn) == slot->number)
894 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
895 set this higher, assuming the system even supports it. */
896 dev->dma_mask = 0xffffffff;
898 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
899 dev->bus->number, PCI_SLOT(dev->devfn),
900 PCI_FUNC(dev->devfn));
902 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
903 dev->revision = class & 0xff;
904 class >>= 8; /* upper 3 bytes */
908 dev_dbg(&dev->dev, "found [%04x:%04x] class %06x header type %02x\n",
909 dev->vendor, dev->device, class, dev->hdr_type);
911 /* need to have dev->class ready */
912 dev->cfg_size = pci_cfg_space_size(dev);
914 /* "Unknown power state" */
915 dev->current_state = PCI_UNKNOWN;
917 /* Early fixups, before probing the BARs */
918 pci_fixup_device(pci_fixup_early, dev);
919 /* device class may be changed after fixup */
920 class = dev->class >> 8;
922 switch (dev->hdr_type) { /* header type */
923 case PCI_HEADER_TYPE_NORMAL: /* standard header */
924 if (class == PCI_CLASS_BRIDGE_PCI)
927 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
928 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
929 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
932 * Do the ugly legacy mode stuff here rather than broken chip
933 * quirk code. Legacy mode ATA controllers have fixed
934 * addresses. These are not always echoed in BAR0-3, and
935 * BAR0-3 in a few cases contain junk!
937 if (class == PCI_CLASS_STORAGE_IDE) {
939 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
940 if ((progif & 1) == 0) {
941 dev->resource[0].start = 0x1F0;
942 dev->resource[0].end = 0x1F7;
943 dev->resource[0].flags = LEGACY_IO_RESOURCE;
944 dev->resource[1].start = 0x3F6;
945 dev->resource[1].end = 0x3F6;
946 dev->resource[1].flags = LEGACY_IO_RESOURCE;
948 if ((progif & 4) == 0) {
949 dev->resource[2].start = 0x170;
950 dev->resource[2].end = 0x177;
951 dev->resource[2].flags = LEGACY_IO_RESOURCE;
952 dev->resource[3].start = 0x376;
953 dev->resource[3].end = 0x376;
954 dev->resource[3].flags = LEGACY_IO_RESOURCE;
959 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
960 if (class != PCI_CLASS_BRIDGE_PCI)
962 /* The PCI-to-PCI bridge spec requires that subtractive
963 decoding (i.e. transparent) bridge must have programming
964 interface code of 0x01. */
966 dev->transparent = ((dev->class & 0xff) == 1);
967 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
968 set_pcie_hotplug_bridge(dev);
969 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
971 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
972 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
976 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
977 if (class != PCI_CLASS_BRIDGE_CARDBUS)
980 pci_read_bases(dev, 1, 0);
981 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
982 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
985 default: /* unknown header */
986 dev_err(&dev->dev, "unknown header type %02x, "
987 "ignoring device\n", dev->hdr_type);
991 dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
992 "type %02x)\n", class, dev->hdr_type);
993 dev->class = PCI_CLASS_NOT_DEFINED;
996 /* We found a fine healthy device, go go go... */
1000 static void pci_release_capabilities(struct pci_dev *dev)
1002 pci_vpd_release(dev);
1003 pci_iov_release(dev);
1007 * pci_release_dev - free a pci device structure when all users of it are finished.
1008 * @dev: device that's been disconnected
1010 * Will be called only by the device core when all users of this pci device are
1013 static void pci_release_dev(struct device *dev)
1015 struct pci_dev *pci_dev;
1017 pci_dev = to_pci_dev(dev);
1018 pci_release_capabilities(pci_dev);
1023 * pci_cfg_space_size - get the configuration space size of the PCI device.
1026 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1027 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1028 * access it. Maybe we don't have a way to generate extended config space
1029 * accesses, or the device is behind a reverse Express bridge. So we try
1030 * reading the dword at 0x100 which must either be 0 or a valid extended
1031 * capability header.
1033 int pci_cfg_space_size_ext(struct pci_dev *dev)
1036 int pos = PCI_CFG_SPACE_SIZE;
1038 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1040 if (status == 0xffffffff)
1043 return PCI_CFG_SPACE_EXP_SIZE;
1046 return PCI_CFG_SPACE_SIZE;
1049 int pci_cfg_space_size(struct pci_dev *dev)
1055 class = dev->class >> 8;
1056 if (class == PCI_CLASS_BRIDGE_HOST)
1057 return pci_cfg_space_size_ext(dev);
1059 pos = pci_pcie_cap(dev);
1061 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1065 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1066 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1070 return pci_cfg_space_size_ext(dev);
1073 return PCI_CFG_SPACE_SIZE;
1076 static void pci_release_bus_bridge_dev(struct device *dev)
1081 struct pci_dev *alloc_pci_dev(void)
1083 struct pci_dev *dev;
1085 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1089 INIT_LIST_HEAD(&dev->bus_list);
1093 EXPORT_SYMBOL(alloc_pci_dev);
1096 * Read the config data for a PCI device, sanity-check it
1097 * and fill in the dev structure...
1099 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1101 struct pci_dev *dev;
1105 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1108 /* some broken boards return 0 or ~0 if a slot is empty: */
1109 if (l == 0xffffffff || l == 0x00000000 ||
1110 l == 0x0000ffff || l == 0xffff0000)
1113 /* Configuration request Retry Status */
1114 while (l == 0xffff0001) {
1117 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
1119 /* Card hasn't responded in 60 seconds? Must be stuck. */
1120 if (delay > 60 * 1000) {
1121 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1122 "responding\n", pci_domain_nr(bus),
1123 bus->number, PCI_SLOT(devfn),
1129 dev = alloc_pci_dev();
1135 dev->vendor = l & 0xffff;
1136 dev->device = (l >> 16) & 0xffff;
1138 if (pci_setup_device(dev)) {
1146 static void pci_init_capabilities(struct pci_dev *dev)
1148 /* MSI/MSI-X list */
1149 pci_msi_init_pci_dev(dev);
1151 /* Buffers for saving PCIe and PCI-X capabilities */
1152 pci_allocate_cap_save_buffers(dev);
1154 /* Power Management */
1156 platform_pci_wakeup_init(dev);
1158 /* Vital Product Data */
1159 pci_vpd_pci22_init(dev);
1161 /* Alternative Routing-ID Forwarding */
1162 pci_enable_ari(dev);
1164 /* Single Root I/O Virtualization */
1167 /* Enable ACS P2P upstream forwarding */
1168 pci_enable_acs(dev);
1171 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1173 device_initialize(&dev->dev);
1174 dev->dev.release = pci_release_dev;
1177 dev->dev.dma_mask = &dev->dma_mask;
1178 dev->dev.dma_parms = &dev->dma_parms;
1179 dev->dev.coherent_dma_mask = 0xffffffffull;
1181 pci_set_dma_max_seg_size(dev, 65536);
1182 pci_set_dma_seg_boundary(dev, 0xffffffff);
1184 /* Fix up broken headers */
1185 pci_fixup_device(pci_fixup_header, dev);
1187 /* Clear the state_saved flag. */
1188 dev->state_saved = false;
1190 /* Initialize various capabilities */
1191 pci_init_capabilities(dev);
1194 * Add the device to our list of discovered devices
1195 * and the bus list for fixup functions, etc.
1197 down_write(&pci_bus_sem);
1198 list_add_tail(&dev->bus_list, &bus->devices);
1199 up_write(&pci_bus_sem);
1202 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1204 struct pci_dev *dev;
1206 dev = pci_get_slot(bus, devfn);
1212 dev = pci_scan_device(bus, devfn);
1216 pci_device_add(dev, bus);
1220 EXPORT_SYMBOL(pci_scan_single_device);
1222 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1225 unsigned pos, next_fn;
1230 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1233 pci_read_config_word(dev, pos + 4, &cap);
1240 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1242 return (fn + 1) % 8;
1245 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1250 static int only_one_child(struct pci_bus *bus)
1252 struct pci_dev *parent = bus->self;
1253 if (!parent || !pci_is_pcie(parent))
1255 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT ||
1256 parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM)
1262 * pci_scan_slot - scan a PCI slot on a bus for devices.
1263 * @bus: PCI bus to scan
1264 * @devfn: slot number to scan (must have zero function.)
1266 * Scan a PCI slot on the specified PCI bus for devices, adding
1267 * discovered devices to the @bus->devices list. New devices
1268 * will not have is_added set.
1270 * Returns the number of new devices found.
1272 int pci_scan_slot(struct pci_bus *bus, int devfn)
1274 unsigned fn, nr = 0;
1275 struct pci_dev *dev;
1276 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1278 if (only_one_child(bus) && (devfn > 0))
1279 return 0; /* Already scanned the entire slot */
1281 dev = pci_scan_single_device(bus, devfn);
1287 if (pci_ari_enabled(bus))
1288 next_fn = next_ari_fn;
1289 else if (dev->multifunction)
1290 next_fn = next_trad_fn;
1292 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1293 dev = pci_scan_single_device(bus, devfn + fn);
1297 dev->multifunction = 1;
1301 /* only one slot has pcie device */
1302 if (bus->self && nr)
1303 pcie_aspm_init_link_state(bus->self);
1308 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1310 unsigned int devfn, pass, max = bus->secondary;
1311 struct pci_dev *dev;
1313 dev_dbg(&bus->dev, "scanning bus\n");
1315 /* Go find them, Rover! */
1316 for (devfn = 0; devfn < 0x100; devfn += 8)
1317 pci_scan_slot(bus, devfn);
1319 /* Reserve buses for SR-IOV capability. */
1320 max += pci_iov_bus_range(bus);
1323 * After performing arch-dependent fixup of the bus, look behind
1324 * all PCI-to-PCI bridges on this bus.
1326 if (!bus->is_added) {
1327 dev_dbg(&bus->dev, "fixups for bus\n");
1328 pcibios_fixup_bus(bus);
1329 if (pci_is_root_bus(bus))
1333 for (pass=0; pass < 2; pass++)
1334 list_for_each_entry(dev, &bus->devices, bus_list) {
1335 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1336 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1337 max = pci_scan_bridge(bus, dev, max, pass);
1341 * We've scanned the bus and so we know all about what's on
1342 * the other side of any bridges that may be on this bus plus
1345 * Return how far we've got finding sub-buses.
1347 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1351 struct pci_bus * pci_create_bus(struct device *parent,
1352 int bus, struct pci_ops *ops, void *sysdata)
1355 struct pci_bus *b, *b2;
1358 b = pci_alloc_bus();
1362 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1368 b->sysdata = sysdata;
1371 b2 = pci_find_bus(pci_domain_nr(b), bus);
1373 /* If we already got to this bus through a different bridge, ignore it */
1374 dev_dbg(&b2->dev, "bus already known\n");
1378 down_write(&pci_bus_sem);
1379 list_add_tail(&b->node, &pci_root_buses);
1380 up_write(&pci_bus_sem);
1382 dev->parent = parent;
1383 dev->release = pci_release_bus_bridge_dev;
1384 dev_set_name(dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1385 error = device_register(dev);
1388 b->bridge = get_device(dev);
1391 set_dev_node(b->bridge, pcibus_to_node(b));
1393 b->dev.class = &pcibus_class;
1394 b->dev.parent = b->bridge;
1395 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1396 error = device_register(&b->dev);
1398 goto class_dev_reg_err;
1399 error = device_create_file(&b->dev, &dev_attr_cpuaffinity);
1401 goto dev_create_file_err;
1403 /* Create legacy_io and legacy_mem files for this bus */
1404 pci_create_legacy_files(b);
1406 b->number = b->secondary = bus;
1407 b->resource[0] = &ioport_resource;
1408 b->resource[1] = &iomem_resource;
1412 dev_create_file_err:
1413 device_unregister(&b->dev);
1415 device_unregister(dev);
1417 down_write(&pci_bus_sem);
1419 up_write(&pci_bus_sem);
1426 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1427 int bus, struct pci_ops *ops, void *sysdata)
1431 b = pci_create_bus(parent, bus, ops, sysdata);
1433 b->subordinate = pci_scan_child_bus(b);
1436 EXPORT_SYMBOL(pci_scan_bus_parented);
1438 #ifdef CONFIG_HOTPLUG
1440 * pci_rescan_bus - scan a PCI bus for devices.
1441 * @bus: PCI bus to scan
1443 * Scan a PCI bus and child buses for new devices, adds them,
1446 * Returns the max number of subordinate bus discovered.
1448 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1451 struct pci_dev *dev;
1453 max = pci_scan_child_bus(bus);
1455 down_read(&pci_bus_sem);
1456 list_for_each_entry(dev, &bus->devices, bus_list)
1457 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1458 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1459 if (dev->subordinate)
1460 pci_bus_size_bridges(dev->subordinate);
1461 up_read(&pci_bus_sem);
1463 pci_bus_assign_resources(bus);
1464 pci_enable_bridges(bus);
1465 pci_bus_add_devices(bus);
1469 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1471 EXPORT_SYMBOL(pci_add_new_bus);
1472 EXPORT_SYMBOL(pci_scan_slot);
1473 EXPORT_SYMBOL(pci_scan_bridge);
1474 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1477 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1479 const struct pci_dev *a = to_pci_dev(d_a);
1480 const struct pci_dev *b = to_pci_dev(d_b);
1482 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1483 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1485 if (a->bus->number < b->bus->number) return -1;
1486 else if (a->bus->number > b->bus->number) return 1;
1488 if (a->devfn < b->devfn) return -1;
1489 else if (a->devfn > b->devfn) return 1;
1494 void __init pci_sort_breadthfirst(void)
1496 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);