2 * Low-Level PCI Support for PC
7 #include <linux/sched.h>
9 #include <linux/pci-acpi.h>
10 #include <linux/ioport.h>
11 #include <linux/init.h>
12 #include <linux/dmi.h>
13 #include <linux/slab.h>
15 #include <asm-generic/pci-bridge.h>
17 #include <asm/segment.h>
20 #include <asm/pci_x86.h>
21 #include <asm/setup.h>
23 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
26 unsigned int pci_early_dump_regs;
27 static int pci_bf_sort;
28 static int smbios_type_b1_flag;
31 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
32 int noioapicreroute = 0;
34 int noioapicreroute = 1;
36 int pcibios_last_bus = -1;
37 unsigned long pirq_table_addr;
38 const struct pci_raw_ops *__read_mostly raw_pci_ops;
39 const struct pci_raw_ops *__read_mostly raw_pci_ext_ops;
41 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
42 int reg, int len, u32 *val)
44 if (domain == 0 && reg < 256 && raw_pci_ops)
45 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
47 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
51 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
52 int reg, int len, u32 val)
54 if (domain == 0 && reg < 256 && raw_pci_ops)
55 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
57 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
61 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
63 return raw_pci_read(pci_domain_nr(bus), bus->number,
64 devfn, where, size, value);
67 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
69 return raw_pci_write(pci_domain_nr(bus), bus->number,
70 devfn, where, size, value);
73 struct pci_ops pci_root_ops = {
79 * This interrupt-safe spinlock protects all accesses to PCI
80 * configuration space.
82 DEFINE_RAW_SPINLOCK(pci_config_lock);
84 static int can_skip_ioresource_align(const struct dmi_system_id *d)
86 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
87 printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
91 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] = {
93 * Systems where PCI IO resource ISA alignment can be skipped
94 * when the ISA enable bit in the bridge control is not set
97 .callback = can_skip_ioresource_align,
98 .ident = "IBM System x3800",
100 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
101 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
105 .callback = can_skip_ioresource_align,
106 .ident = "IBM System x3850",
108 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
109 DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
113 .callback = can_skip_ioresource_align,
114 .ident = "IBM System x3950",
116 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
117 DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
123 void __init dmi_check_skip_isa_align(void)
125 dmi_check_system(can_skip_pciprobe_dmi_table);
128 static void pcibios_fixup_device_resources(struct pci_dev *dev)
130 struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
131 struct resource *bar_r;
134 if (pci_probe & PCI_NOASSIGN_BARS) {
136 * If the BIOS did not assign the BAR, zero out the
137 * resource so the kernel doesn't attmept to assign
138 * it later on in pci_assign_unassigned_resources
140 for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {
141 bar_r = &dev->resource[bar];
142 if (bar_r->start == 0 && bar_r->end != 0) {
149 if (pci_probe & PCI_NOASSIGN_ROMS) {
153 /* we deal with BIOS assigned ROM later */
156 rom_r->start = rom_r->end = rom_r->flags = 0;
161 * Called after each bus is probed, but before its children
165 void pcibios_fixup_bus(struct pci_bus *b)
169 pci_read_bridge_bases(b);
170 list_for_each_entry(dev, &b->devices, bus_list)
171 pcibios_fixup_device_resources(dev);
174 void pcibios_add_bus(struct pci_bus *bus)
176 acpi_pci_add_bus(bus);
179 void pcibios_remove_bus(struct pci_bus *bus)
181 acpi_pci_remove_bus(bus);
185 * Only use DMI information to set this if nothing was passed
186 * on the kernel command line (which was parsed earlier).
189 static int set_bf_sort(const struct dmi_system_id *d)
191 if (pci_bf_sort == pci_bf_sort_default) {
192 pci_bf_sort = pci_dmi_bf;
193 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
198 static void read_dmi_type_b1(const struct dmi_header *dm,
201 u8 *d = (u8 *)dm + 4;
203 if (dm->type != 0xB1)
205 switch (((*(u32 *)d) >> 9) & 0x03) {
207 printk(KERN_INFO "dmi type 0xB1 record - unknown flag\n");
209 case 0x01: /* set pci=bfsort */
210 smbios_type_b1_flag = 1;
212 case 0x02: /* do not set pci=bfsort */
213 smbios_type_b1_flag = 2;
220 static int find_sort_method(const struct dmi_system_id *d)
222 dmi_walk(read_dmi_type_b1, NULL);
224 if (smbios_type_b1_flag == 1) {
232 * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
235 static int assign_all_busses(const struct dmi_system_id *d)
237 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
238 printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
239 " (pci=assign-busses)\n", d->ident);
244 static int set_scan_all(const struct dmi_system_id *d)
246 printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n",
248 pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
252 static const struct dmi_system_id pciprobe_dmi_table[] = {
255 * Laptops which need pci=assign-busses to see Cardbus cards
258 .callback = assign_all_busses,
259 .ident = "Samsung X20 Laptop",
261 DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
262 DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
265 #endif /* __i386__ */
267 .callback = set_bf_sort,
268 .ident = "Dell PowerEdge 1950",
270 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
271 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
275 .callback = set_bf_sort,
276 .ident = "Dell PowerEdge 1955",
278 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
279 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
283 .callback = set_bf_sort,
284 .ident = "Dell PowerEdge 2900",
286 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
287 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
291 .callback = set_bf_sort,
292 .ident = "Dell PowerEdge 2950",
294 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
295 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
299 .callback = set_bf_sort,
300 .ident = "Dell PowerEdge R900",
302 DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
303 DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
307 .callback = find_sort_method,
308 .ident = "Dell System",
310 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
314 .callback = set_bf_sort,
315 .ident = "HP ProLiant BL20p G3",
317 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
318 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
322 .callback = set_bf_sort,
323 .ident = "HP ProLiant BL20p G4",
325 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
326 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
330 .callback = set_bf_sort,
331 .ident = "HP ProLiant BL30p G1",
333 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
334 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
338 .callback = set_bf_sort,
339 .ident = "HP ProLiant BL25p G1",
341 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
342 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
346 .callback = set_bf_sort,
347 .ident = "HP ProLiant BL35p G1",
349 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
350 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
354 .callback = set_bf_sort,
355 .ident = "HP ProLiant BL45p G1",
357 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
358 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
362 .callback = set_bf_sort,
363 .ident = "HP ProLiant BL45p G2",
365 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
366 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
370 .callback = set_bf_sort,
371 .ident = "HP ProLiant BL460c G1",
373 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
374 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
378 .callback = set_bf_sort,
379 .ident = "HP ProLiant BL465c G1",
381 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
382 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
386 .callback = set_bf_sort,
387 .ident = "HP ProLiant BL480c G1",
389 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
390 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
394 .callback = set_bf_sort,
395 .ident = "HP ProLiant BL685c G1",
397 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
398 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
402 .callback = set_bf_sort,
403 .ident = "HP ProLiant DL360",
405 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
406 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
410 .callback = set_bf_sort,
411 .ident = "HP ProLiant DL380",
413 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
414 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
419 .callback = assign_all_busses,
420 .ident = "Compaq EVO N800c",
422 DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
423 DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
428 .callback = set_bf_sort,
429 .ident = "HP ProLiant DL385 G2",
431 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
432 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
436 .callback = set_bf_sort,
437 .ident = "HP ProLiant DL585 G2",
439 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
444 .callback = set_scan_all,
445 .ident = "Stratus/NEC ftServer",
447 DMI_MATCH(DMI_SYS_VENDOR, "Stratus"),
448 DMI_MATCH(DMI_PRODUCT_NAME, "ftServer"),
454 void __init dmi_check_pciprobe(void)
456 dmi_check_system(pciprobe_dmi_table);
459 struct pci_bus *pcibios_scan_root(int busnum)
461 struct pci_bus *bus = NULL;
463 while ((bus = pci_find_next_bus(bus)) != NULL) {
464 if (bus->number == busnum) {
465 /* Already scanned */
470 return pci_scan_bus_on_node(busnum, &pci_root_ops,
471 get_mp_bus_to_node(busnum));
474 void __init pcibios_set_cache_line_size(void)
476 struct cpuinfo_x86 *c = &boot_cpu_data;
479 * Set PCI cacheline size to that of the CPU if the CPU has reported it.
480 * (For older CPUs that don't support cpuid, we se it to 32 bytes
481 * It's also good for 386/486s (which actually have 16)
482 * as quite a few PCI devices do not support smaller values.
484 if (c->x86_clflush_size > 0) {
485 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
486 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
487 pci_dfl_cache_line_size << 2);
489 pci_dfl_cache_line_size = 32 >> 2;
490 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
494 int __init pcibios_init(void)
497 printk(KERN_WARNING "PCI: System does not support PCI\n");
501 pcibios_set_cache_line_size();
502 pcibios_resource_survey();
504 if (pci_bf_sort >= pci_force_bf)
505 pci_sort_breadthfirst();
509 char * __init pcibios_setup(char *str)
511 if (!strcmp(str, "off")) {
514 } else if (!strcmp(str, "bfsort")) {
515 pci_bf_sort = pci_force_bf;
517 } else if (!strcmp(str, "nobfsort")) {
518 pci_bf_sort = pci_force_nobf;
521 #ifdef CONFIG_PCI_BIOS
522 else if (!strcmp(str, "bios")) {
523 pci_probe = PCI_PROBE_BIOS;
525 } else if (!strcmp(str, "nobios")) {
526 pci_probe &= ~PCI_PROBE_BIOS;
528 } else if (!strcmp(str, "biosirq")) {
529 pci_probe |= PCI_BIOS_IRQ_SCAN;
531 } else if (!strncmp(str, "pirqaddr=", 9)) {
532 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
536 #ifdef CONFIG_PCI_DIRECT
537 else if (!strcmp(str, "conf1")) {
538 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
541 else if (!strcmp(str, "conf2")) {
542 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
546 #ifdef CONFIG_PCI_MMCONFIG
547 else if (!strcmp(str, "nommconf")) {
548 pci_probe &= ~PCI_PROBE_MMCONF;
551 else if (!strcmp(str, "check_enable_amd_mmconf")) {
552 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
556 else if (!strcmp(str, "noacpi")) {
560 else if (!strcmp(str, "noearly")) {
561 pci_probe |= PCI_PROBE_NOEARLY;
564 #ifndef CONFIG_X86_VISWS
565 else if (!strcmp(str, "usepirqmask")) {
566 pci_probe |= PCI_USE_PIRQ_MASK;
568 } else if (!strncmp(str, "irqmask=", 8)) {
569 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
571 } else if (!strncmp(str, "lastbus=", 8)) {
572 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
576 else if (!strcmp(str, "rom")) {
577 pci_probe |= PCI_ASSIGN_ROMS;
579 } else if (!strcmp(str, "norom")) {
580 pci_probe |= PCI_NOASSIGN_ROMS;
582 } else if (!strcmp(str, "nobar")) {
583 pci_probe |= PCI_NOASSIGN_BARS;
585 } else if (!strcmp(str, "assign-busses")) {
586 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
588 } else if (!strcmp(str, "use_crs")) {
589 pci_probe |= PCI_USE__CRS;
591 } else if (!strcmp(str, "nocrs")) {
592 pci_probe |= PCI_ROOT_NO_CRS;
594 } else if (!strcmp(str, "earlydump")) {
595 pci_early_dump_regs = 1;
597 } else if (!strcmp(str, "routeirq")) {
600 } else if (!strcmp(str, "skip_isa_align")) {
601 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
603 } else if (!strcmp(str, "noioapicquirk")) {
606 } else if (!strcmp(str, "ioapicreroute")) {
607 if (noioapicreroute != -1)
610 } else if (!strcmp(str, "noioapicreroute")) {
611 if (noioapicreroute != -1)
618 unsigned int pcibios_assign_all_busses(void)
620 return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
623 int pcibios_add_device(struct pci_dev *dev)
625 struct setup_data *data;
626 struct pci_setup_rom *rom;
629 pa_data = boot_params.hdr.setup_data;
631 data = ioremap(pa_data, sizeof(*rom));
635 if (data->type == SETUP_PCI) {
636 rom = (struct pci_setup_rom *)data;
638 if ((pci_domain_nr(dev->bus) == rom->segment) &&
639 (dev->bus->number == rom->bus) &&
640 (PCI_SLOT(dev->devfn) == rom->device) &&
641 (PCI_FUNC(dev->devfn) == rom->function) &&
642 (dev->vendor == rom->vendor) &&
643 (dev->device == rom->devid)) {
645 offsetof(struct pci_setup_rom, romdata);
646 dev->romlen = rom->pcilen;
649 pa_data = data->next;
655 int pcibios_enable_device(struct pci_dev *dev, int mask)
659 if ((err = pci_enable_resources(dev, mask)) < 0)
662 if (!pci_dev_msi_enabled(dev))
663 return pcibios_enable_irq(dev);
667 void pcibios_disable_device (struct pci_dev *dev)
669 if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
670 pcibios_disable_irq(dev);
673 int pci_ext_cfg_avail(void)
681 struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
683 LIST_HEAD(resources);
684 struct pci_bus *bus = NULL;
685 struct pci_sysdata *sd;
688 * Allocate per-root-bus (not per bus) arch-specific data.
689 * TODO: leak; this memory is never freed.
690 * It's arguable whether it's worth the trouble to care.
692 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
694 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
698 x86_pci_root_bus_resources(busno, &resources);
699 printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busno);
700 bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
702 pci_free_resource_list(&resources);
709 struct pci_bus *pci_scan_bus_with_sysdata(int busno)
711 return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
715 * NUMA info for PCI busses
717 * Early arch code is responsible for filling in reasonable values here.
718 * A node id of "-1" means "use current node". In other words, if a bus
719 * has a -1 node id, it's not tightly coupled to any particular chunk
720 * of memory (as is the case on some Nehalem systems).
728 static int mp_bus_to_node[BUS_NR] = {
729 [0 ... BUS_NR - 1] = -1
732 void set_mp_bus_to_node(int busnum, int node)
734 if (busnum >= 0 && busnum < BUS_NR)
735 mp_bus_to_node[busnum] = node;
738 int get_mp_bus_to_node(int busnum)
742 if (busnum < 0 || busnum > (BUS_NR - 1))
745 node = mp_bus_to_node[busnum];
748 * let numa_node_id to decide it later in dma_alloc_pages
749 * if there is no ram on that node
751 if (node != -1 && !node_online(node))
757 #else /* CONFIG_X86_32 */
759 static int mp_bus_to_node[BUS_NR] = {
760 [0 ... BUS_NR - 1] = -1
763 void set_mp_bus_to_node(int busnum, int node)
765 if (busnum >= 0 && busnum < BUS_NR)
766 mp_bus_to_node[busnum] = (unsigned char) node;
769 int get_mp_bus_to_node(int busnum)
773 if (busnum < 0 || busnum > (BUS_NR - 1))
775 node = mp_bus_to_node[busnum];
779 #endif /* CONFIG_X86_32 */
781 #endif /* CONFIG_NUMA */