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 
raw_pci_read(unsigned int domain,unsigned int bus,unsigned int devfn,int reg,int len,u32 * val)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 
raw_pci_write(unsigned int domain,unsigned int bus,unsigned int devfn,int reg,int len,u32 val)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 
pci_read(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * value)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 
pci_write(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 value)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 
can_skip_ioresource_align(const struct dmi_system_id * d)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 
dmi_check_skip_isa_align(void)122 void __init dmi_check_skip_isa_align(void)
123 {
124 	dmi_check_system(can_skip_pciprobe_dmi_table);
125 }
126 
pcibios_fixup_device_resources(struct pci_dev * dev)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 
pcibios_fixup_bus(struct pci_bus * b)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 
pcibios_add_bus(struct pci_bus * bus)173 void pcibios_add_bus(struct pci_bus *bus)
174 {
175 	acpi_pci_add_bus(bus);
176 }
177 
pcibios_remove_bus(struct pci_bus * bus)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 
set_bf_sort(const struct dmi_system_id * d)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 
read_dmi_type_b1(const struct dmi_header * dm,void * private_data)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 
find_sort_method(const struct dmi_system_id * d)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__
assign_all_busses(const struct dmi_system_id * d)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 
set_scan_all(const struct dmi_system_id * d)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 
dmi_check_pciprobe(void)453 void __init dmi_check_pciprobe(void)
454 {
455 	dmi_check_system(pciprobe_dmi_table);
456 }
457 
pcibios_scan_root(int busnum)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 
pcibios_set_cache_line_size(void)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 
pcibios_init(void)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 
pcibios_setup(char * str)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 	} else if (!strcmp(str, "use_e820")) {
599 		pci_probe |= PCI_USE_E820;
600 		add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
601 		return NULL;
602 	} else if (!strcmp(str, "no_e820")) {
603 		pci_probe |= PCI_NO_E820;
604 		add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
605 		return NULL;
606 #ifdef CONFIG_PHYS_ADDR_T_64BIT
607 	} else if (!strcmp(str, "big_root_window")) {
608 		pci_probe |= PCI_BIG_ROOT_WINDOW;
609 		return NULL;
610 #endif
611 	} else if (!strcmp(str, "routeirq")) {
612 		pci_routeirq = 1;
613 		return NULL;
614 	} else if (!strcmp(str, "skip_isa_align")) {
615 		pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
616 		return NULL;
617 	} else if (!strcmp(str, "noioapicquirk")) {
618 		noioapicquirk = 1;
619 		return NULL;
620 	} else if (!strcmp(str, "ioapicreroute")) {
621 		if (noioapicreroute != -1)
622 			noioapicreroute = 0;
623 		return NULL;
624 	} else if (!strcmp(str, "noioapicreroute")) {
625 		if (noioapicreroute != -1)
626 			noioapicreroute = 1;
627 		return NULL;
628 	}
629 	return str;
630 }
631 
pcibios_assign_all_busses(void)632 unsigned int pcibios_assign_all_busses(void)
633 {
634 	return (pci_probe & PCI_ASSIGN_ALL_BUSSES) ? 1 : 0;
635 }
636 
set_dev_domain_options(struct pci_dev * pdev)637 static void set_dev_domain_options(struct pci_dev *pdev)
638 {
639 	if (is_vmd(pdev->bus))
640 		pdev->hotplug_user_indicators = 1;
641 }
642 
pcibios_device_add(struct pci_dev * dev)643 int pcibios_device_add(struct pci_dev *dev)
644 {
645 	struct pci_setup_rom *rom;
646 	struct irq_domain *msidom;
647 	struct setup_data *data;
648 	u64 pa_data;
649 
650 	pa_data = boot_params.hdr.setup_data;
651 	while (pa_data) {
652 		data = memremap(pa_data, sizeof(*rom), MEMREMAP_WB);
653 		if (!data)
654 			return -ENOMEM;
655 
656 		if (data->type == SETUP_PCI) {
657 			rom = (struct pci_setup_rom *)data;
658 
659 			if ((pci_domain_nr(dev->bus) == rom->segment) &&
660 			    (dev->bus->number == rom->bus) &&
661 			    (PCI_SLOT(dev->devfn) == rom->device) &&
662 			    (PCI_FUNC(dev->devfn) == rom->function) &&
663 			    (dev->vendor == rom->vendor) &&
664 			    (dev->device == rom->devid)) {
665 				dev->rom = pa_data +
666 				      offsetof(struct pci_setup_rom, romdata);
667 				dev->romlen = rom->pcilen;
668 			}
669 		}
670 		pa_data = data->next;
671 		memunmap(data);
672 	}
673 	set_dev_domain_options(dev);
674 
675 	/*
676 	 * Setup the initial MSI domain of the device. If the underlying
677 	 * bus has a PCI/MSI irqdomain associated use the bus domain,
678 	 * otherwise set the default domain. This ensures that special irq
679 	 * domains e.g. VMD are preserved. The default ensures initial
680 	 * operation if irq remapping is not active. If irq remapping is
681 	 * active it will overwrite the domain pointer when the device is
682 	 * associated to a remapping domain.
683 	 */
684 	msidom = dev_get_msi_domain(&dev->bus->dev);
685 	if (!msidom)
686 		msidom = x86_pci_msi_default_domain;
687 	dev_set_msi_domain(&dev->dev, msidom);
688 	return 0;
689 }
690 
pcibios_enable_device(struct pci_dev * dev,int mask)691 int pcibios_enable_device(struct pci_dev *dev, int mask)
692 {
693 	int err;
694 
695 	if ((err = pci_enable_resources(dev, mask)) < 0)
696 		return err;
697 
698 	if (!pci_dev_msi_enabled(dev))
699 		return pcibios_enable_irq(dev);
700 	return 0;
701 }
702 
pcibios_disable_device(struct pci_dev * dev)703 void pcibios_disable_device (struct pci_dev *dev)
704 {
705 	if (!pci_dev_msi_enabled(dev) && pcibios_disable_irq)
706 		pcibios_disable_irq(dev);
707 }
708 
709 #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
pcibios_release_device(struct pci_dev * dev)710 void pcibios_release_device(struct pci_dev *dev)
711 {
712 	if (atomic_dec_return(&dev->enable_cnt) >= 0)
713 		pcibios_disable_device(dev);
714 
715 }
716 #endif
717 
pci_ext_cfg_avail(void)718 int pci_ext_cfg_avail(void)
719 {
720 	if (raw_pci_ext_ops)
721 		return 1;
722 	else
723 		return 0;
724 }
725 
726 #if IS_ENABLED(CONFIG_VMD)
pci_real_dma_dev(struct pci_dev * dev)727 struct pci_dev *pci_real_dma_dev(struct pci_dev *dev)
728 {
729 	if (is_vmd(dev->bus))
730 		return to_pci_sysdata(dev->bus)->vmd_dev;
731 
732 	return dev;
733 }
734 #endif
735