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TOMOYO Linux Cross Reference
Linux/arch/x86/pci/common.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *      Low-Level PCI Support for PC
  4  *
  5  *      (c) 1999--2000 Martin Mares <mj@ucw.cz>
  6  */
  7 
  8 #include <linux/sched.h>
  9 #include <linux/pci.h>
 10 #include <linux/pci-acpi.h>
 11 #include <linux/ioport.h>
 12 #include <linux/init.h>
 13 #include <linux/dmi.h>
 14 #include <linux/slab.h>
 15 
 16 #include <asm/acpi.h>
 17 #include <asm/segment.h>
 18 #include <asm/io.h>
 19 #include <asm/smp.h>
 20 #include <asm/pci_x86.h>
 21 #include <asm/setup.h>
 22 #include <asm/irqdomain.h>
 23 
 24 unsigned int pci_probe = PCI_PROBE_BIOS | PCI_PROBE_CONF1 | PCI_PROBE_CONF2 |
 25                                 PCI_PROBE_MMCONF;
 26 
 27 static int pci_bf_sort;
 28 int pci_routeirq;
 29 int noioapicquirk;
 30 #ifdef CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS
 31 int noioapicreroute = 0;
 32 #else
 33 int noioapicreroute = 1;
 34 #endif
 35 int pcibios_last_bus = -1;
 36 unsigned long pirq_table_addr;
 37 const struct pci_raw_ops *__read_mostly raw_pci_ops;
 38 const struct pci_raw_ops *__read_mostly raw_pci_ext_ops;
 39 
 40 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,
 41                                                 int reg, int len, u32 *val)
 42 {
 43         if (domain == 0 && reg < 256 && raw_pci_ops)
 44                 return raw_pci_ops->read(domain, bus, devfn, reg, len, val);
 45         if (raw_pci_ext_ops)
 46                 return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);
 47         return -EINVAL;
 48 }
 49 
 50 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
 51                                                 int reg, int len, u32 val)
 52 {
 53         if (domain == 0 && reg < 256 && raw_pci_ops)
 54                 return raw_pci_ops->write(domain, bus, devfn, reg, len, val);
 55         if (raw_pci_ext_ops)
 56                 return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);
 57         return -EINVAL;
 58 }
 59 
 60 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
 61 {
 62         return raw_pci_read(pci_domain_nr(bus), bus->number,
 63                                  devfn, where, size, value);
 64 }
 65 
 66 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
 67 {
 68         return raw_pci_write(pci_domain_nr(bus), bus->number,
 69                                   devfn, where, size, value);
 70 }
 71 
 72 struct pci_ops pci_root_ops = {
 73         .read = pci_read,
 74         .write = pci_write,
 75 };
 76 
 77 /*
 78  * This interrupt-safe spinlock protects all accesses to PCI configuration
 79  * space, except for the mmconfig (ECAM) based operations.
 80  */
 81 DEFINE_RAW_SPINLOCK(pci_config_lock);
 82 
 83 static int __init can_skip_ioresource_align(const struct dmi_system_id *d)
 84 {
 85         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
 86         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
 87         return 0;
 88 }
 89 
 90 static const struct dmi_system_id can_skip_pciprobe_dmi_table[] __initconst = {
 91 /*
 92  * Systems where PCI IO resource ISA alignment can be skipped
 93  * when the ISA enable bit in the bridge control is not set
 94  */
 95         {
 96                 .callback = can_skip_ioresource_align,
 97                 .ident = "IBM System x3800",
 98                 .matches = {
 99                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
100                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
101                 },
102         },
103         {
104                 .callback = can_skip_ioresource_align,
105                 .ident = "IBM System x3850",
106                 .matches = {
107                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
108                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
109                 },
110         },
111         {
112                 .callback = can_skip_ioresource_align,
113                 .ident = "IBM System x3950",
114                 .matches = {
115                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
116                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
117                 },
118         },
119         {}
120 };
121 
122 void __init dmi_check_skip_isa_align(void)
123 {
124         dmi_check_system(can_skip_pciprobe_dmi_table);
125 }
126 
127 static void pcibios_fixup_device_resources(struct pci_dev *dev)
128 {
129         struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];
130         struct resource *bar_r;
131         int bar;
132 
133         if (pci_probe & PCI_NOASSIGN_BARS) {
134                 /*
135                 * If the BIOS did not assign the BAR, zero out the
136                 * resource so the kernel doesn't attempt to assign
137                 * it later on in pci_assign_unassigned_resources
138                 */
139                 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
140                         bar_r = &dev->resource[bar];
141                         if (bar_r->start == 0 && bar_r->end != 0) {
142                                 bar_r->flags = 0;
143                                 bar_r->end = 0;
144                         }
145                 }
146         }
147 
148         if (pci_probe & PCI_NOASSIGN_ROMS) {
149                 if (rom_r->parent)
150                         return;
151                 if (rom_r->start) {
152                         /* we deal with BIOS assigned ROM later */
153                         return;
154                 }
155                 rom_r->start = rom_r->end = rom_r->flags = 0;
156         }
157 }
158 
159 /*
160  *  Called after each bus is probed, but before its children
161  *  are examined.
162  */
163 
164 void pcibios_fixup_bus(struct pci_bus *b)
165 {
166         struct pci_dev *dev;
167 
168         pci_read_bridge_bases(b);
169         list_for_each_entry(dev, &b->devices, bus_list)
170                 pcibios_fixup_device_resources(dev);
171 }
172 
173 void pcibios_add_bus(struct pci_bus *bus)
174 {
175         acpi_pci_add_bus(bus);
176 }
177 
178 void pcibios_remove_bus(struct pci_bus *bus)
179 {
180         acpi_pci_remove_bus(bus);
181 }
182 
183 /*
184  * Only use DMI information to set this if nothing was passed
185  * on the kernel command line (which was parsed earlier).
186  */
187 
188 static int __init set_bf_sort(const struct dmi_system_id *d)
189 {
190         if (pci_bf_sort == pci_bf_sort_default) {
191                 pci_bf_sort = pci_dmi_bf;
192                 printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);
193         }
194         return 0;
195 }
196 
197 static void __init read_dmi_type_b1(const struct dmi_header *dm,
198                                     void *private_data)
199 {
200         u8 *data = (u8 *)dm + 4;
201 
202         if (dm->type != 0xB1)
203                 return;
204         if ((((*(u32 *)data) >> 9) & 0x03) == 0x01)
205                 set_bf_sort((const struct dmi_system_id *)private_data);
206 }
207 
208 static int __init find_sort_method(const struct dmi_system_id *d)
209 {
210         dmi_walk(read_dmi_type_b1, (void *)d);
211         return 0;
212 }
213 
214 /*
215  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
216  */
217 #ifdef __i386__
218 static int __init assign_all_busses(const struct dmi_system_id *d)
219 {
220         pci_probe |= PCI_ASSIGN_ALL_BUSSES;
221         printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"
222                         " (pci=assign-busses)\n", d->ident);
223         return 0;
224 }
225 #endif
226 
227 static int __init set_scan_all(const struct dmi_system_id *d)
228 {
229         printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n",
230                d->ident);
231         pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS);
232         return 0;
233 }
234 
235 static const struct dmi_system_id pciprobe_dmi_table[] __initconst = {
236 #ifdef __i386__
237 /*
238  * Laptops which need pci=assign-busses to see Cardbus cards
239  */
240         {
241                 .callback = assign_all_busses,
242                 .ident = "Samsung X20 Laptop",
243                 .matches = {
244                         DMI_MATCH(DMI_SYS_VENDOR, "Samsung Electronics"),
245                         DMI_MATCH(DMI_PRODUCT_NAME, "SX20S"),
246                 },
247         },
248 #endif          /* __i386__ */
249         {
250                 .callback = set_bf_sort,
251                 .ident = "Dell PowerEdge 1950",
252                 .matches = {
253                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
254                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1950"),
255                 },
256         },
257         {
258                 .callback = set_bf_sort,
259                 .ident = "Dell PowerEdge 1955",
260                 .matches = {
261                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
262                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1955"),
263                 },
264         },
265         {
266                 .callback = set_bf_sort,
267                 .ident = "Dell PowerEdge 2900",
268                 .matches = {
269                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
270                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2900"),
271                 },
272         },
273         {
274                 .callback = set_bf_sort,
275                 .ident = "Dell PowerEdge 2950",
276                 .matches = {
277                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
278                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2950"),
279                 },
280         },
281         {
282                 .callback = set_bf_sort,
283                 .ident = "Dell PowerEdge R900",
284                 .matches = {
285                         DMI_MATCH(DMI_SYS_VENDOR, "Dell"),
286                         DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge R900"),
287                 },
288         },
289         {
290                 .callback = find_sort_method,
291                 .ident = "Dell System",
292                 .matches = {
293                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc"),
294                 },
295         },
296         {
297                 .callback = set_bf_sort,
298                 .ident = "HP ProLiant BL20p G3",
299                 .matches = {
300                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
301                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G3"),
302                 },
303         },
304         {
305                 .callback = set_bf_sort,
306                 .ident = "HP ProLiant BL20p G4",
307                 .matches = {
308                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
309                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL20p G4"),
310                 },
311         },
312         {
313                 .callback = set_bf_sort,
314                 .ident = "HP ProLiant BL30p G1",
315                 .matches = {
316                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
317                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL30p G1"),
318                 },
319         },
320         {
321                 .callback = set_bf_sort,
322                 .ident = "HP ProLiant BL25p G1",
323                 .matches = {
324                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
325                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL25p G1"),
326                 },
327         },
328         {
329                 .callback = set_bf_sort,
330                 .ident = "HP ProLiant BL35p G1",
331                 .matches = {
332                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
333                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL35p G1"),
334                 },
335         },
336         {
337                 .callback = set_bf_sort,
338                 .ident = "HP ProLiant BL45p G1",
339                 .matches = {
340                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
341                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G1"),
342                 },
343         },
344         {
345                 .callback = set_bf_sort,
346                 .ident = "HP ProLiant BL45p G2",
347                 .matches = {
348                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
349                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL45p G2"),
350                 },
351         },
352         {
353                 .callback = set_bf_sort,
354                 .ident = "HP ProLiant BL460c G1",
355                 .matches = {
356                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
357                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL460c G1"),
358                 },
359         },
360         {
361                 .callback = set_bf_sort,
362                 .ident = "HP ProLiant BL465c G1",
363                 .matches = {
364                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
365                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL465c G1"),
366                 },
367         },
368         {
369                 .callback = set_bf_sort,
370                 .ident = "HP ProLiant BL480c G1",
371                 .matches = {
372                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
373                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL480c G1"),
374                 },
375         },
376         {
377                 .callback = set_bf_sort,
378                 .ident = "HP ProLiant BL685c G1",
379                 .matches = {
380                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
381                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant BL685c G1"),
382                 },
383         },
384         {
385                 .callback = set_bf_sort,
386                 .ident = "HP ProLiant DL360",
387                 .matches = {
388                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
389                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL360"),
390                 },
391         },
392         {
393                 .callback = set_bf_sort,
394                 .ident = "HP ProLiant DL380",
395                 .matches = {
396                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
397                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL380"),
398                 },
399         },
400 #ifdef __i386__
401         {
402                 .callback = assign_all_busses,
403                 .ident = "Compaq EVO N800c",
404                 .matches = {
405                         DMI_MATCH(DMI_SYS_VENDOR, "Compaq"),
406                         DMI_MATCH(DMI_PRODUCT_NAME, "EVO N800c"),
407                 },
408         },
409 #endif
410         {
411                 .callback = set_bf_sort,
412                 .ident = "HP ProLiant DL385 G2",
413                 .matches = {
414                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
415                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL385 G2"),
416                 },
417         },
418         {
419                 .callback = set_bf_sort,
420                 .ident = "HP ProLiant DL585 G2",
421                 .matches = {
422                         DMI_MATCH(DMI_SYS_VENDOR, "HP"),
423                         DMI_MATCH(DMI_PRODUCT_NAME, "ProLiant DL585 G2"),
424                 },
425         },
426         {
427                 .callback = set_scan_all,
428                 .ident = "Stratus/NEC ftServer",
429                 .matches = {
430                         DMI_MATCH(DMI_SYS_VENDOR, "Stratus"),
431                         DMI_MATCH(DMI_PRODUCT_NAME, "ftServer"),
432                 },
433         },
434         {
435                 .callback = set_scan_all,
436                 .ident = "Stratus/NEC ftServer",
437                 .matches = {
438                         DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
439                         DMI_MATCH(DMI_PRODUCT_NAME, "Express5800/R32"),
440                 },
441         },
442         {
443                 .callback = set_scan_all,
444                 .ident = "Stratus/NEC ftServer",
445                 .matches = {
446                         DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
447                         DMI_MATCH(DMI_PRODUCT_NAME, "Express5800/R31"),
448                 },
449         },
450         {}
451 };
452 
453 void __init dmi_check_pciprobe(void)
454 {
455         dmi_check_system(pciprobe_dmi_table);
456 }
457 
458 void pcibios_scan_root(int busnum)
459 {
460         struct pci_bus *bus;
461         struct pci_sysdata *sd;
462         LIST_HEAD(resources);
463 
464         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
465         if (!sd) {
466                 printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum);
467                 return;
468         }
469         sd->node = x86_pci_root_bus_node(busnum);
470         x86_pci_root_bus_resources(busnum, &resources);
471         printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
472         bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
473         if (!bus) {
474                 pci_free_resource_list(&resources);
475                 kfree(sd);
476                 return;
477         }
478         pci_bus_add_devices(bus);
479 }
480 
481 void __init pcibios_set_cache_line_size(void)
482 {
483         struct cpuinfo_x86 *c = &boot_cpu_data;
484 
485         /*
486          * Set PCI cacheline size to that of the CPU if the CPU has reported it.
487          * (For older CPUs that don't support cpuid, we se it to 32 bytes
488          * It's also good for 386/486s (which actually have 16)
489          * as quite a few PCI devices do not support smaller values.
490          */
491         if (c->x86_clflush_size > 0) {
492                 pci_dfl_cache_line_size = c->x86_clflush_size >> 2;
493                 printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",
494                         pci_dfl_cache_line_size << 2);
495         } else {
496                 pci_dfl_cache_line_size = 32 >> 2;
497                 printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");
498         }
499 }
500 
501 int __init pcibios_init(void)
502 {
503         if (!raw_pci_ops && !raw_pci_ext_ops) {
504                 printk(KERN_WARNING "PCI: System does not support PCI\n");
505                 return 0;
506         }
507 
508         pcibios_set_cache_line_size();
509         pcibios_resource_survey();
510 
511         if (pci_bf_sort >= pci_force_bf)
512                 pci_sort_breadthfirst();
513         return 0;
514 }
515 
516 char *__init pcibios_setup(char *str)
517 {
518         if (!strcmp(str, "off")) {
519                 pci_probe = 0;
520                 return NULL;
521         } else if (!strcmp(str, "bfsort")) {
522                 pci_bf_sort = pci_force_bf;
523                 return NULL;
524         } else if (!strcmp(str, "nobfsort")) {
525                 pci_bf_sort = pci_force_nobf;
526                 return NULL;
527         }
528 #ifdef CONFIG_PCI_BIOS
529         else if (!strcmp(str, "bios")) {
530                 pci_probe = PCI_PROBE_BIOS;
531                 return NULL;
532         } else if (!strcmp(str, "nobios")) {
533                 pci_probe &= ~PCI_PROBE_BIOS;
534                 return NULL;
535         } else if (!strcmp(str, "biosirq")) {
536                 pci_probe |= PCI_BIOS_IRQ_SCAN;
537                 return NULL;
538         } else if (!strncmp(str, "pirqaddr=", 9)) {
539                 pirq_table_addr = simple_strtoul(str+9, NULL, 0);
540                 return NULL;
541         }
542 #endif
543 #ifdef CONFIG_PCI_DIRECT
544         else if (!strcmp(str, "conf1")) {
545                 pci_probe = PCI_PROBE_CONF1 | PCI_NO_CHECKS;
546                 return NULL;
547         }
548         else if (!strcmp(str, "conf2")) {
549                 pci_probe = PCI_PROBE_CONF2 | PCI_NO_CHECKS;
550                 return NULL;
551         }
552 #endif
553 #ifdef CONFIG_PCI_MMCONFIG
554         else if (!strcmp(str, "nommconf")) {
555                 pci_probe &= ~PCI_PROBE_MMCONF;
556                 return NULL;
557         }
558         else if (!strcmp(str, "check_enable_amd_mmconf")) {
559                 pci_probe |= PCI_CHECK_ENABLE_AMD_MMCONF;
560                 return NULL;
561         }
562 #endif
563         else if (!strcmp(str, "noacpi")) {
564                 acpi_noirq_set();
565                 return NULL;
566         }
567         else if (!strcmp(str, "noearly")) {
568                 pci_probe |= PCI_PROBE_NOEARLY;
569                 return NULL;
570         }
571         else if (!strcmp(str, "usepirqmask")) {
572                 pci_probe |= PCI_USE_PIRQ_MASK;
573                 return NULL;
574         } else if (!strncmp(str, "irqmask=", 8)) {
575                 pcibios_irq_mask = simple_strtol(str+8, NULL, 0);
576                 return NULL;
577         } else if (!strncmp(str, "lastbus=", 8)) {
578                 pcibios_last_bus = simple_strtol(str+8, NULL, 0);
579                 return NULL;
580         } else if (!strcmp(str, "rom")) {
581                 pci_probe |= PCI_ASSIGN_ROMS;
582                 return NULL;
583         } else if (!strcmp(str, "norom")) {
584                 pci_probe |= PCI_NOASSIGN_ROMS;
585                 return NULL;
586         } else if (!strcmp(str, "nobar")) {
587                 pci_probe |= PCI_NOASSIGN_BARS;
588                 return NULL;
589         } else if (!strcmp(str, "assign-busses")) {
590                 pci_probe |= PCI_ASSIGN_ALL_BUSSES;
591                 return NULL;
592         } else if (!strcmp(str, "use_crs")) {
593                 pci_probe |= PCI_USE__CRS;
594                 return NULL;
595         } else if (!strcmp(str, "nocrs")) {
596                 pci_probe |= PCI_ROOT_NO_CRS;
597                 return NULL;
598 #ifdef CONFIG_PHYS_ADDR_T_64BIT
599         } else if (!strcmp(str, "big_root_window")) {
600                 pci_probe |= PCI_BIG_ROOT_WINDOW;
601                 return NULL;
602 #endif
603         } else if (!strcmp(str, "routeirq")) {
604                 pci_routeirq = 1;
605                 return NULL;
606         } else if (!strcmp(str, "skip_isa_align")) {
607                 pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
608                 return NULL;
609         } else if (!strcmp(str, "noioapicquirk")) {
610                 noioapicquirk = 1;
611                 return NULL;
612         } else if (!strcmp(str, "ioapicreroute")) {
613                 if (noioapicreroute != -1)
614                         noioapicreroute = 0;
615                 return NULL;
616         } else if (!strcmp(str, "noioapicreroute")) {
617                 if (noioapicreroute != -1)
618                         noioapicreroute = 1;
619                 return NULL;
620         }
621         return str;
622 }
623 
624 unsigned int pcibios_assign_all_busses(void)
625 {
626         return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
627 }
628 
629 static void set_dev_domain_options(struct pci_dev *pdev)
630 {
631         if (is_vmd(pdev->bus))
632                 pdev->hotplug_user_indicators = 1;
633 }
634 
635 int pcibios_add_device(struct pci_dev *dev)
636 {
637         struct pci_setup_rom *rom;
638         struct irq_domain *msidom;
639         struct setup_data *data;
640         u64 pa_data;
641 
642         pa_data = boot_params.hdr.setup_data;
643         while (pa_data) {
644                 data = memremap(pa_data, sizeof(*rom), MEMREMAP_WB);
645                 if (!data)
646                         return -ENOMEM;
647 
648                 if (data->type == SETUP_PCI) {
649                         rom = (struct pci_setup_rom *)data;
650 
651                         if ((pci_domain_nr(dev->bus) == rom->segment) &&
652                             (dev->bus->number == rom->bus) &&
653                             (PCI_SLOT(dev->devfn) == rom->device) &&
654                             (PCI_FUNC(dev->devfn) == rom->function) &&
655                             (dev->vendor == rom->vendor) &&
656                             (dev->device == rom->devid)) {
657                                 dev->rom = pa_data +
658                                       offsetof(struct pci_setup_rom, romdata);
659                                 dev->romlen = rom->pcilen;
660                         }
661                 }
662                 pa_data = data->next;
663                 memunmap(data);
664         }
665         set_dev_domain_options(dev);
666 
667         /*
668          * Setup the initial MSI domain of the device. If the underlying
669          * bus has a PCI/MSI irqdomain associated use the bus domain,
670          * otherwise set the default domain. This ensures that special irq
671          * domains e.g. VMD are preserved. The default ensures initial
672          * operation if irq remapping is not active. If irq remapping is
673          * active it will overwrite the domain pointer when the device is
674          * associated to a remapping domain.
675          */
676         msidom = dev_get_msi_domain(&dev->bus->dev);
677         if (!msidom)
678                 msidom = x86_pci_msi_default_domain;
679         dev_set_msi_domain(&dev->dev, msidom);
680         return 0;
681 }
682 
683 int pcibios_enable_device(struct pci_dev *dev, int mask)
684 {
685         int err;
686 
687         if ((err = pci_enable_resources(dev, mask)) < 0)
688                 return err;
689 
690         if (!pci_dev_msi_enabled(dev))
691                 return pcibios_enable_irq(dev);
692         return 0;
693 }
694 
695 void pcibios_disable_device (struct pci_dev *dev)
696 {
697         if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
698                 pcibios_disable_irq(dev);
699 }
700 
701 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
702 void pcibios_release_device(struct pci_dev *dev)
703 {
704         if (atomic_dec_return(&dev->enable_cnt) >= 0)
705                 pcibios_disable_device(dev);
706 
707 }
708 #endif
709 
710 int pci_ext_cfg_avail(void)
711 {
712         if (raw_pci_ext_ops)
713                 return 1;
714         else
715                 return 0;
716 }
717 
718 #if IS_ENABLED(CONFIG_VMD)
719 struct pci_dev *pci_real_dma_dev(struct pci_dev *dev)
720 {
721         if (is_vmd(dev->bus))
722                 return to_pci_sysdata(dev->bus)->vmd_dev;
723 
724         return dev;
725 }
726 #endif
727 

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