xref: /openbmc/linux/arch/x86/pci/acpi.c (revision 92a2c6b2)
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 	struct pci_sysdata sd;
14 #ifdef	CONFIG_PCI_MMCONFIG
15 	bool mcfg_added;
16 	u16 segment;
17 	u8 start_bus;
18 	u8 end_bus;
19 #endif
20 };
21 
22 static bool pci_use_crs = true;
23 static bool pci_ignore_seg = false;
24 
25 static int __init set_use_crs(const struct dmi_system_id *id)
26 {
27 	pci_use_crs = true;
28 	return 0;
29 }
30 
31 static int __init set_nouse_crs(const struct dmi_system_id *id)
32 {
33 	pci_use_crs = false;
34 	return 0;
35 }
36 
37 static int __init set_ignore_seg(const struct dmi_system_id *id)
38 {
39 	printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
40 	pci_ignore_seg = true;
41 	return 0;
42 }
43 
44 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
45 	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
46 	{
47 		.callback = set_use_crs,
48 		.ident = "IBM System x3800",
49 		.matches = {
50 			DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
51 			DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
52 		},
53 	},
54 	/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
55 	/* 2006 AMD HT/VIA system with two host bridges */
56         {
57 		.callback = set_use_crs,
58 		.ident = "ASRock ALiveSATA2-GLAN",
59 		.matches = {
60 			DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
61                 },
62         },
63 	/* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
64 	/* 2006 AMD HT/VIA system with two host bridges */
65 	{
66 		.callback = set_use_crs,
67 		.ident = "ASUS M2V-MX SE",
68 		.matches = {
69 			DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
70 			DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
71 			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
72 		},
73 	},
74 	/* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
75 	{
76 		.callback = set_use_crs,
77 		.ident = "MSI MS-7253",
78 		.matches = {
79 			DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
80 			DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
81 			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
82 		},
83 	},
84 
85 	/* Now for the blacklist.. */
86 
87 	/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
88 	{
89 		.callback = set_nouse_crs,
90 		.ident = "Dell Studio 1557",
91 		.matches = {
92 			DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
93 			DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
94 			DMI_MATCH(DMI_BIOS_VERSION, "A09"),
95 		},
96 	},
97 	/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
98 	{
99 		.callback = set_nouse_crs,
100 		.ident = "Thinkpad SL510",
101 		.matches = {
102 			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
103 			DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
104 			DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
105 		},
106 	},
107 
108 	/* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
109 	{
110 		.callback = set_ignore_seg,
111 		.ident = "HP xw9300",
112 		.matches = {
113 			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
114 			DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
115 		},
116 	},
117 	{}
118 };
119 
120 void __init pci_acpi_crs_quirks(void)
121 {
122 	int year;
123 
124 	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
125 		pci_use_crs = false;
126 
127 	dmi_check_system(pci_crs_quirks);
128 
129 	/*
130 	 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
131 	 * takes precedence over anything we figured out above.
132 	 */
133 	if (pci_probe & PCI_ROOT_NO_CRS)
134 		pci_use_crs = false;
135 	else if (pci_probe & PCI_USE__CRS)
136 		pci_use_crs = true;
137 
138 	printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
139 	       "if necessary, use \"pci=%s\" and report a bug\n",
140 	       pci_use_crs ? "Using" : "Ignoring",
141 	       pci_use_crs ? "nocrs" : "use_crs");
142 }
143 
144 #ifdef	CONFIG_PCI_MMCONFIG
145 static int check_segment(u16 seg, struct device *dev, char *estr)
146 {
147 	if (seg) {
148 		dev_err(dev,
149 			"%s can't access PCI configuration "
150 			"space under this host bridge.\n",
151 			estr);
152 		return -EIO;
153 	}
154 
155 	/*
156 	 * Failure in adding MMCFG information is not fatal,
157 	 * just can't access extended configuration space of
158 	 * devices under this host bridge.
159 	 */
160 	dev_warn(dev,
161 		 "%s can't access extended PCI configuration "
162 		 "space under this bridge.\n",
163 		 estr);
164 
165 	return 0;
166 }
167 
168 static int setup_mcfg_map(struct pci_root_info *info, u16 seg, u8 start,
169 			  u8 end, phys_addr_t addr)
170 {
171 	int result;
172 	struct device *dev = &info->bridge->dev;
173 
174 	info->start_bus = start;
175 	info->end_bus = end;
176 	info->mcfg_added = false;
177 
178 	/* return success if MMCFG is not in use */
179 	if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
180 		return 0;
181 
182 	if (!(pci_probe & PCI_PROBE_MMCONF))
183 		return check_segment(seg, dev, "MMCONFIG is disabled,");
184 
185 	result = pci_mmconfig_insert(dev, seg, start, end, addr);
186 	if (result == 0) {
187 		/* enable MMCFG if it hasn't been enabled yet */
188 		if (raw_pci_ext_ops == NULL)
189 			raw_pci_ext_ops = &pci_mmcfg;
190 		info->mcfg_added = true;
191 	} else if (result != -EEXIST)
192 		return check_segment(seg, dev,
193 			 "fail to add MMCONFIG information,");
194 
195 	return 0;
196 }
197 
198 static void teardown_mcfg_map(struct pci_root_info *info)
199 {
200 	if (info->mcfg_added) {
201 		pci_mmconfig_delete(info->segment, info->start_bus,
202 				    info->end_bus);
203 		info->mcfg_added = false;
204 	}
205 }
206 #else
207 static int setup_mcfg_map(struct pci_root_info *info,
208 				    u16 seg, u8 start, u8 end,
209 				    phys_addr_t addr)
210 {
211 	return 0;
212 }
213 static void teardown_mcfg_map(struct pci_root_info *info)
214 {
215 }
216 #endif
217 
218 static void validate_resources(struct device *dev, struct list_head *crs_res,
219 			       unsigned long type)
220 {
221 	LIST_HEAD(list);
222 	struct resource *res1, *res2, *root = NULL;
223 	struct resource_entry *tmp, *entry, *entry2;
224 
225 	BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
226 	root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
227 
228 	list_splice_init(crs_res, &list);
229 	resource_list_for_each_entry_safe(entry, tmp, &list) {
230 		bool free = false;
231 		resource_size_t end;
232 
233 		res1 = entry->res;
234 		if (!(res1->flags & type))
235 			goto next;
236 
237 		/* Exclude non-addressable range or non-addressable portion */
238 		end = min(res1->end, root->end);
239 		if (end <= res1->start) {
240 			dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
241 				 res1);
242 			free = true;
243 			goto next;
244 		} else if (res1->end != end) {
245 			dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
246 				 res1, (unsigned long long)end + 1,
247 				 (unsigned long long)res1->end);
248 			res1->end = end;
249 		}
250 
251 		resource_list_for_each_entry(entry2, crs_res) {
252 			res2 = entry2->res;
253 			if (!(res2->flags & type))
254 				continue;
255 
256 			/*
257 			 * I don't like throwing away windows because then
258 			 * our resources no longer match the ACPI _CRS, but
259 			 * the kernel resource tree doesn't allow overlaps.
260 			 */
261 			if (resource_overlaps(res1, res2)) {
262 				res2->start = min(res1->start, res2->start);
263 				res2->end = max(res1->end, res2->end);
264 				dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
265 					 res2, res1);
266 				free = true;
267 				goto next;
268 			}
269 		}
270 
271 next:
272 		resource_list_del(entry);
273 		if (free)
274 			resource_list_free_entry(entry);
275 		else
276 			resource_list_add_tail(entry, crs_res);
277 	}
278 }
279 
280 static void add_resources(struct pci_root_info *info,
281 			  struct list_head *resources,
282 			  struct list_head *crs_res)
283 {
284 	struct resource_entry *entry, *tmp;
285 	struct resource *res, *conflict, *root = NULL;
286 
287 	validate_resources(&info->bridge->dev, crs_res, IORESOURCE_MEM);
288 	validate_resources(&info->bridge->dev, crs_res, IORESOURCE_IO);
289 
290 	resource_list_for_each_entry_safe(entry, tmp, crs_res) {
291 		res = entry->res;
292 		if (res->flags & IORESOURCE_MEM)
293 			root = &iomem_resource;
294 		else if (res->flags & IORESOURCE_IO)
295 			root = &ioport_resource;
296 		else
297 			BUG_ON(res);
298 
299 		conflict = insert_resource_conflict(root, res);
300 		if (conflict) {
301 			dev_info(&info->bridge->dev,
302 				 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
303 				 res, conflict->name, conflict);
304 			resource_list_destroy_entry(entry);
305 		}
306 	}
307 
308 	list_splice_tail(crs_res, resources);
309 }
310 
311 static void release_pci_root_info(struct pci_host_bridge *bridge)
312 {
313 	struct resource *res;
314 	struct resource_entry *entry;
315 	struct pci_root_info *info = bridge->release_data;
316 
317 	resource_list_for_each_entry(entry, &bridge->windows) {
318 		res = entry->res;
319 		if (res->parent &&
320 		    (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
321 			release_resource(res);
322 	}
323 
324 	teardown_mcfg_map(info);
325 	kfree(info);
326 }
327 
328 static void probe_pci_root_info(struct pci_root_info *info,
329 				struct acpi_device *device,
330 				int busnum, int domain,
331 				struct list_head *list)
332 {
333 	int ret;
334 	struct resource_entry *entry;
335 
336 	sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
337 	info->bridge = device;
338 	ret = acpi_dev_get_resources(device, list,
339 				     acpi_dev_filter_resource_type_cb,
340 				     (void *)(IORESOURCE_IO | IORESOURCE_MEM));
341 	if (ret < 0)
342 		dev_warn(&device->dev,
343 			 "failed to parse _CRS method, error code %d\n", ret);
344 	else if (ret == 0)
345 		dev_dbg(&device->dev,
346 			"no IO and memory resources present in _CRS\n");
347 	else
348 		resource_list_for_each_entry(entry, list)
349 			entry->res->name = info->name;
350 }
351 
352 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
353 {
354 	struct acpi_device *device = root->device;
355 	struct pci_root_info *info;
356 	int domain = root->segment;
357 	int busnum = root->secondary.start;
358 	struct resource_entry *res_entry;
359 	LIST_HEAD(crs_res);
360 	LIST_HEAD(resources);
361 	struct pci_bus *bus;
362 	struct pci_sysdata *sd;
363 	int node;
364 
365 	if (pci_ignore_seg)
366 		domain = 0;
367 
368 	if (domain && !pci_domains_supported) {
369 		printk(KERN_WARNING "pci_bus %04x:%02x: "
370 		       "ignored (multiple domains not supported)\n",
371 		       domain, busnum);
372 		return NULL;
373 	}
374 
375 	node = acpi_get_node(device->handle);
376 	if (node == NUMA_NO_NODE) {
377 		node = x86_pci_root_bus_node(busnum);
378 		if (node != 0 && node != NUMA_NO_NODE)
379 			dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
380 				node);
381 	}
382 
383 	if (node != NUMA_NO_NODE && !node_online(node))
384 		node = NUMA_NO_NODE;
385 
386 	info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
387 	if (!info) {
388 		printk(KERN_WARNING "pci_bus %04x:%02x: "
389 		       "ignored (out of memory)\n", domain, busnum);
390 		return NULL;
391 	}
392 
393 	sd = &info->sd;
394 	sd->domain = domain;
395 	sd->node = node;
396 	sd->companion = device;
397 
398 	bus = pci_find_bus(domain, busnum);
399 	if (bus) {
400 		/*
401 		 * If the desired bus has been scanned already, replace
402 		 * its bus->sysdata.
403 		 */
404 		memcpy(bus->sysdata, sd, sizeof(*sd));
405 		kfree(info);
406 	} else {
407 		/* insert busn res at first */
408 		pci_add_resource(&resources,  &root->secondary);
409 
410 		/*
411 		 * _CRS with no apertures is normal, so only fall back to
412 		 * defaults or native bridge info if we're ignoring _CRS.
413 		 */
414 		probe_pci_root_info(info, device, busnum, domain, &crs_res);
415 		if (pci_use_crs) {
416 			add_resources(info, &resources, &crs_res);
417 		} else {
418 			resource_list_for_each_entry(res_entry, &crs_res)
419 				dev_printk(KERN_DEBUG, &device->dev,
420 					   "host bridge window %pR (ignored)\n",
421 					   res_entry->res);
422 			resource_list_free(&crs_res);
423 			x86_pci_root_bus_resources(busnum, &resources);
424 		}
425 
426 		if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
427 				    (u8)root->secondary.end, root->mcfg_addr))
428 			bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
429 						  sd, &resources);
430 
431 		if (bus) {
432 			pci_scan_child_bus(bus);
433 			pci_set_host_bridge_release(
434 				to_pci_host_bridge(bus->bridge),
435 				release_pci_root_info, info);
436 		} else {
437 			resource_list_free(&resources);
438 			teardown_mcfg_map(info);
439 			kfree(info);
440 		}
441 	}
442 
443 	/* After the PCI-E bus has been walked and all devices discovered,
444 	 * configure any settings of the fabric that might be necessary.
445 	 */
446 	if (bus) {
447 		struct pci_bus *child;
448 		list_for_each_entry(child, &bus->children, node)
449 			pcie_bus_configure_settings(child);
450 	}
451 
452 	if (bus && node != NUMA_NO_NODE)
453 		dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
454 
455 	return bus;
456 }
457 
458 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
459 {
460 	struct pci_sysdata *sd = bridge->bus->sysdata;
461 
462 	ACPI_COMPANION_SET(&bridge->dev, sd->companion);
463 	return 0;
464 }
465 
466 int __init pci_acpi_init(void)
467 {
468 	struct pci_dev *dev = NULL;
469 
470 	if (acpi_noirq)
471 		return -ENODEV;
472 
473 	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
474 	acpi_irq_penalty_init();
475 	pcibios_enable_irq = acpi_pci_irq_enable;
476 	pcibios_disable_irq = acpi_pci_irq_disable;
477 	x86_init.pci.init_irq = x86_init_noop;
478 
479 	if (pci_routeirq) {
480 		/*
481 		 * PCI IRQ routing is set up by pci_enable_device(), but we
482 		 * also do it here in case there are still broken drivers that
483 		 * don't use pci_enable_device().
484 		 */
485 		printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
486 		for_each_pci_dev(dev)
487 			acpi_pci_irq_enable(dev);
488 	}
489 
490 	return 0;
491 }
492