xref: /openbmc/linux/arch/x86/pci/acpi.c (revision 600a711c) 
1 #include <linux/pci.h>
2 #include <linux/acpi.h>
3 #include <linux/init.h>
4 #include <linux/irq.h>
5 #include <linux/dmi.h>
6 #include <linux/slab.h>
7 #include <asm/numa.h>
8 #include <asm/pci_x86.h>
9 
10 struct pci_root_info {
11 	struct acpi_device *bridge;
12 	char name[16];
13 	unsigned int res_num;
14 	struct resource *res;
15 	struct pci_sysdata sd;
16 #ifdef	CONFIG_PCI_MMCONFIG
17 	bool mcfg_added;
18 	u16 segment;
19 	u8 start_bus;
20 	u8 end_bus;
21 #endif
22 };
23 
24 static bool pci_use_crs = true;
25 
26 static int __init set_use_crs(const struct dmi_system_id *id)
27 {
28 	pci_use_crs = true;
29 	return 0;
30 }
31 
32 static int __init set_nouse_crs(const struct dmi_system_id *id)
33 {
34 	pci_use_crs = false;
35 	return 0;
36 }
37 
38 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
39 	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
40 	{
41 		.callback = set_use_crs,
42 		.ident = "IBM System x3800",
43 		.matches = {
44 			DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
45 			DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
46 		},
47 	},
48 	/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
49 	/* 2006 AMD HT/VIA system with two host bridges */
50         {
51 		.callback = set_use_crs,
52 		.ident = "ASRock ALiveSATA2-GLAN",
53 		.matches = {
54 			DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
55                 },
56         },
57 	/* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
58 	/* 2006 AMD HT/VIA system with two host bridges */
59 	{
60 		.callback = set_use_crs,
61 		.ident = "ASUS M2V-MX SE",
62 		.matches = {
63 			DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
64 			DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
65 			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
66 		},
67 	},
68 	/* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
69 	{
70 		.callback = set_use_crs,
71 		.ident = "MSI MS-7253",
72 		.matches = {
73 			DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
74 			DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
75 			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
76 		},
77 	},
78 
79 	/* Now for the blacklist.. */
80 
81 	/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
82 	{
83 		.callback = set_nouse_crs,
84 		.ident = "Dell Studio 1557",
85 		.matches = {
86 			DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
87 			DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
88 			DMI_MATCH(DMI_BIOS_VERSION, "A09"),
89 		},
90 	},
91 	/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
92 	{
93 		.callback = set_nouse_crs,
94 		.ident = "Thinkpad SL510",
95 		.matches = {
96 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
97 			DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
98 			DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
99 		},
100 	},
101 	{}
102 };
103 
104 void __init pci_acpi_crs_quirks(void)
105 {
106 	int year;
107 
108 	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
109 		pci_use_crs = false;
110 
111 	dmi_check_system(pci_use_crs_table);
112 
113 	/*
114 	 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
115 	 * takes precedence over anything we figured out above.
116 	 */
117 	if (pci_probe & PCI_ROOT_NO_CRS)
118 		pci_use_crs = false;
119 	else if (pci_probe & PCI_USE__CRS)
120 		pci_use_crs = true;
121 
122 	printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
123 	       "if necessary, use \"pci=%s\" and report a bug\n",
124 	       pci_use_crs ? "Using" : "Ignoring",
125 	       pci_use_crs ? "nocrs" : "use_crs");
126 }
127 
128 #ifdef	CONFIG_PCI_MMCONFIG
129 static int __devinit check_segment(u16 seg, struct device *dev, char *estr)
130 {
131 	if (seg) {
132 		dev_err(dev,
133 			"%s can't access PCI configuration "
134 			"space under this host bridge.\n",
135 			estr);
136 		return -EIO;
137 	}
138 
139 	/*
140 	 * Failure in adding MMCFG information is not fatal,
141 	 * just can't access extended configuration space of
142 	 * devices under this host bridge.
143 	 */
144 	dev_warn(dev,
145 		 "%s can't access extended PCI configuration "
146 		 "space under this bridge.\n",
147 		 estr);
148 
149 	return 0;
150 }
151 
152 static int __devinit setup_mcfg_map(struct pci_root_info *info,
153 				    u16 seg, u8 start, u8 end,
154 				    phys_addr_t addr)
155 {
156 	int result;
157 	struct device *dev = &info->bridge->dev;
158 
159 	info->start_bus = start;
160 	info->end_bus = end;
161 	info->mcfg_added = false;
162 
163 	/* return success if MMCFG is not in use */
164 	if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
165 		return 0;
166 
167 	if (!(pci_probe & PCI_PROBE_MMCONF))
168 		return check_segment(seg, dev, "MMCONFIG is disabled,");
169 
170 	result = pci_mmconfig_insert(dev, seg, start, end, addr);
171 	if (result == 0) {
172 		/* enable MMCFG if it hasn't been enabled yet */
173 		if (raw_pci_ext_ops == NULL)
174 			raw_pci_ext_ops = &pci_mmcfg;
175 		info->mcfg_added = true;
176 	} else if (result != -EEXIST)
177 		return check_segment(seg, dev,
178 			 "fail to add MMCONFIG information,");
179 
180 	return 0;
181 }
182 
183 static void teardown_mcfg_map(struct pci_root_info *info)
184 {
185 	if (info->mcfg_added) {
186 		pci_mmconfig_delete(info->segment, info->start_bus,
187 				    info->end_bus);
188 		info->mcfg_added = false;
189 	}
190 }
191 #else
192 static int __devinit setup_mcfg_map(struct pci_root_info *info,
193 				    u16 seg, u8 start, u8 end,
194 				    phys_addr_t addr)
195 {
196 	return 0;
197 }
198 static void teardown_mcfg_map(struct pci_root_info *info)
199 {
200 }
201 #endif
202 
203 static acpi_status
204 resource_to_addr(struct acpi_resource *resource,
205 			struct acpi_resource_address64 *addr)
206 {
207 	acpi_status status;
208 	struct acpi_resource_memory24 *memory24;
209 	struct acpi_resource_memory32 *memory32;
210 	struct acpi_resource_fixed_memory32 *fixed_memory32;
211 
212 	memset(addr, 0, sizeof(*addr));
213 	switch (resource->type) {
214 	case ACPI_RESOURCE_TYPE_MEMORY24:
215 		memory24 = &resource->data.memory24;
216 		addr->resource_type = ACPI_MEMORY_RANGE;
217 		addr->minimum = memory24->minimum;
218 		addr->address_length = memory24->address_length;
219 		addr->maximum = addr->minimum + addr->address_length - 1;
220 		return AE_OK;
221 	case ACPI_RESOURCE_TYPE_MEMORY32:
222 		memory32 = &resource->data.memory32;
223 		addr->resource_type = ACPI_MEMORY_RANGE;
224 		addr->minimum = memory32->minimum;
225 		addr->address_length = memory32->address_length;
226 		addr->maximum = addr->minimum + addr->address_length - 1;
227 		return AE_OK;
228 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
229 		fixed_memory32 = &resource->data.fixed_memory32;
230 		addr->resource_type = ACPI_MEMORY_RANGE;
231 		addr->minimum = fixed_memory32->address;
232 		addr->address_length = fixed_memory32->address_length;
233 		addr->maximum = addr->minimum + addr->address_length - 1;
234 		return AE_OK;
235 	case ACPI_RESOURCE_TYPE_ADDRESS16:
236 	case ACPI_RESOURCE_TYPE_ADDRESS32:
237 	case ACPI_RESOURCE_TYPE_ADDRESS64:
238 		status = acpi_resource_to_address64(resource, addr);
239 		if (ACPI_SUCCESS(status) &&
240 		    (addr->resource_type == ACPI_MEMORY_RANGE ||
241 		    addr->resource_type == ACPI_IO_RANGE) &&
242 		    addr->address_length > 0) {
243 			return AE_OK;
244 		}
245 		break;
246 	}
247 	return AE_ERROR;
248 }
249 
250 static acpi_status
251 count_resource(struct acpi_resource *acpi_res, void *data)
252 {
253 	struct pci_root_info *info = data;
254 	struct acpi_resource_address64 addr;
255 	acpi_status status;
256 
257 	status = resource_to_addr(acpi_res, &addr);
258 	if (ACPI_SUCCESS(status))
259 		info->res_num++;
260 	return AE_OK;
261 }
262 
263 static acpi_status
264 setup_resource(struct acpi_resource *acpi_res, void *data)
265 {
266 	struct pci_root_info *info = data;
267 	struct resource *res;
268 	struct acpi_resource_address64 addr;
269 	acpi_status status;
270 	unsigned long flags;
271 	u64 start, orig_end, end;
272 
273 	status = resource_to_addr(acpi_res, &addr);
274 	if (!ACPI_SUCCESS(status))
275 		return AE_OK;
276 
277 	if (addr.resource_type == ACPI_MEMORY_RANGE) {
278 		flags = IORESOURCE_MEM;
279 		if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
280 			flags |= IORESOURCE_PREFETCH;
281 	} else if (addr.resource_type == ACPI_IO_RANGE) {
282 		flags = IORESOURCE_IO;
283 	} else
284 		return AE_OK;
285 
286 	start = addr.minimum + addr.translation_offset;
287 	orig_end = end = addr.maximum + addr.translation_offset;
288 
289 	/* Exclude non-addressable range or non-addressable portion of range */
290 	end = min(end, (u64)iomem_resource.end);
291 	if (end <= start) {
292 		dev_info(&info->bridge->dev,
293 			"host bridge window [%#llx-%#llx] "
294 			"(ignored, not CPU addressable)\n", start, orig_end);
295 		return AE_OK;
296 	} else if (orig_end != end) {
297 		dev_info(&info->bridge->dev,
298 			"host bridge window [%#llx-%#llx] "
299 			"([%#llx-%#llx] ignored, not CPU addressable)\n",
300 			start, orig_end, end + 1, orig_end);
301 	}
302 
303 	res = &info->res[info->res_num];
304 	res->name = info->name;
305 	res->flags = flags;
306 	res->start = start;
307 	res->end = end;
308 
309 	if (!pci_use_crs) {
310 		dev_printk(KERN_DEBUG, &info->bridge->dev,
311 			   "host bridge window %pR (ignored)\n", res);
312 		return AE_OK;
313 	}
314 
315 	info->res_num++;
316 
317 	return AE_OK;
318 }
319 
320 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
321 {
322 	int i, j;
323 	struct resource *res1, *res2;
324 
325 	for (i = 0; i < info->res_num; i++) {
326 		res1 = &info->res[i];
327 		if (!(res1->flags & type))
328 			continue;
329 
330 		for (j = i + 1; j < info->res_num; j++) {
331 			res2 = &info->res[j];
332 			if (!(res2->flags & type))
333 				continue;
334 
335 			/*
336 			 * I don't like throwing away windows because then
337 			 * our resources no longer match the ACPI _CRS, but
338 			 * the kernel resource tree doesn't allow overlaps.
339 			 */
340 			if (resource_overlaps(res1, res2)) {
341 				res1->start = min(res1->start, res2->start);
342 				res1->end = max(res1->end, res2->end);
343 				dev_info(&info->bridge->dev,
344 					 "host bridge window expanded to %pR; %pR ignored\n",
345 					 res1, res2);
346 				res2->flags = 0;
347 			}
348 		}
349 	}
350 }
351 
352 static void add_resources(struct pci_root_info *info,
353 			  struct list_head *resources)
354 {
355 	int i;
356 	struct resource *res, *root, *conflict;
357 
358 	coalesce_windows(info, IORESOURCE_MEM);
359 	coalesce_windows(info, IORESOURCE_IO);
360 
361 	for (i = 0; i < info->res_num; i++) {
362 		res = &info->res[i];
363 
364 		if (res->flags & IORESOURCE_MEM)
365 			root = &iomem_resource;
366 		else if (res->flags & IORESOURCE_IO)
367 			root = &ioport_resource;
368 		else
369 			continue;
370 
371 		conflict = insert_resource_conflict(root, res);
372 		if (conflict)
373 			dev_info(&info->bridge->dev,
374 				 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
375 				 res, conflict->name, conflict);
376 		else
377 			pci_add_resource(resources, res);
378 	}
379 }
380 
381 static void free_pci_root_info_res(struct pci_root_info *info)
382 {
383 	kfree(info->res);
384 	info->res = NULL;
385 	info->res_num = 0;
386 }
387 
388 static void __release_pci_root_info(struct pci_root_info *info)
389 {
390 	int i;
391 	struct resource *res;
392 
393 	for (i = 0; i < info->res_num; i++) {
394 		res = &info->res[i];
395 
396 		if (!res->parent)
397 			continue;
398 
399 		if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
400 			continue;
401 
402 		release_resource(res);
403 	}
404 
405 	free_pci_root_info_res(info);
406 
407 	teardown_mcfg_map(info);
408 
409 	kfree(info);
410 }
411 
412 static void release_pci_root_info(struct pci_host_bridge *bridge)
413 {
414 	struct pci_root_info *info = bridge->release_data;
415 
416 	__release_pci_root_info(info);
417 }
418 
419 static void
420 probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
421 		    int busnum, int domain)
422 {
423 	size_t size;
424 
425 	sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
426 	info->bridge = device;
427 
428 	info->res_num = 0;
429 	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
430 				info);
431 	if (!info->res_num)
432 		return;
433 
434 	size = sizeof(*info->res) * info->res_num;
435 	info->res_num = 0;
436 	info->res = kzalloc(size, GFP_KERNEL);
437 	if (!info->res)
438 		return;
439 
440 	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
441 				info);
442 }
443 
444 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
445 {
446 	struct acpi_device *device = root->device;
447 	struct pci_root_info *info = NULL;
448 	int domain = root->segment;
449 	int busnum = root->secondary.start;
450 	LIST_HEAD(resources);
451 	struct pci_bus *bus = NULL;
452 	struct pci_sysdata *sd;
453 	int node;
454 #ifdef CONFIG_ACPI_NUMA
455 	int pxm;
456 #endif
457 
458 	if (domain && !pci_domains_supported) {
459 		printk(KERN_WARNING "pci_bus %04x:%02x: "
460 		       "ignored (multiple domains not supported)\n",
461 		       domain, busnum);
462 		return NULL;
463 	}
464 
465 	node = -1;
466 #ifdef CONFIG_ACPI_NUMA
467 	pxm = acpi_get_pxm(device->handle);
468 	if (pxm >= 0)
469 		node = pxm_to_node(pxm);
470 	if (node != -1)
471 		set_mp_bus_to_node(busnum, node);
472 	else
473 #endif
474 		node = get_mp_bus_to_node(busnum);
475 
476 	if (node != -1 && !node_online(node))
477 		node = -1;
478 
479 	info = kzalloc(sizeof(*info), GFP_KERNEL);
480 	if (!info) {
481 		printk(KERN_WARNING "pci_bus %04x:%02x: "
482 		       "ignored (out of memory)\n", domain, busnum);
483 		return NULL;
484 	}
485 
486 	sd = &info->sd;
487 	sd->domain = domain;
488 	sd->node = node;
489 	/*
490 	 * Maybe the desired pci bus has been already scanned. In such case
491 	 * it is unnecessary to scan the pci bus with the given domain,busnum.
492 	 */
493 	bus = pci_find_bus(domain, busnum);
494 	if (bus) {
495 		/*
496 		 * If the desired bus exits, the content of bus->sysdata will
497 		 * be replaced by sd.
498 		 */
499 		memcpy(bus->sysdata, sd, sizeof(*sd));
500 		kfree(info);
501 	} else {
502 		probe_pci_root_info(info, device, busnum, domain);
503 
504 		/* insert busn res at first */
505 		pci_add_resource(&resources,  &root->secondary);
506 		/*
507 		 * _CRS with no apertures is normal, so only fall back to
508 		 * defaults or native bridge info if we're ignoring _CRS.
509 		 */
510 		if (pci_use_crs)
511 			add_resources(info, &resources);
512 		else {
513 			free_pci_root_info_res(info);
514 			x86_pci_root_bus_resources(busnum, &resources);
515 		}
516 
517 		if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
518 				    (u8)root->secondary.end, root->mcfg_addr))
519 			bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
520 						  sd, &resources);
521 
522 		if (bus) {
523 			pci_scan_child_bus(bus);
524 			pci_set_host_bridge_release(
525 				to_pci_host_bridge(bus->bridge),
526 				release_pci_root_info, info);
527 		} else {
528 			pci_free_resource_list(&resources);
529 			__release_pci_root_info(info);
530 		}
531 	}
532 
533 	/* After the PCI-E bus has been walked and all devices discovered,
534 	 * configure any settings of the fabric that might be necessary.
535 	 */
536 	if (bus) {
537 		struct pci_bus *child;
538 		list_for_each_entry(child, &bus->children, node) {
539 			struct pci_dev *self = child->self;
540 			if (!self)
541 				continue;
542 
543 			pcie_bus_configure_settings(child, self->pcie_mpss);
544 		}
545 	}
546 
547 	if (bus && node != -1) {
548 #ifdef CONFIG_ACPI_NUMA
549 		if (pxm >= 0)
550 			dev_printk(KERN_DEBUG, &bus->dev,
551 				   "on NUMA node %d (pxm %d)\n", node, pxm);
552 #else
553 		dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
554 #endif
555 	}
556 
557 	return bus;
558 }
559 
560 int __init pci_acpi_init(void)
561 {
562 	struct pci_dev *dev = NULL;
563 
564 	if (acpi_noirq)
565 		return -ENODEV;
566 
567 	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
568 	acpi_irq_penalty_init();
569 	pcibios_enable_irq = acpi_pci_irq_enable;
570 	pcibios_disable_irq = acpi_pci_irq_disable;
571 	x86_init.pci.init_irq = x86_init_noop;
572 
573 	if (pci_routeirq) {
574 		/*
575 		 * PCI IRQ routing is set up by pci_enable_device(), but we
576 		 * also do it here in case there are still broken drivers that
577 		 * don't use pci_enable_device().
578 		 */
579 		printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
580 		for_each_pci_dev(dev)
581 			acpi_pci_irq_enable(dev);
582 	}
583 
584 	return 0;
585 }
586