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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
10struct pci_root_info {
11 struct acpi_device *bridge;
12 char name[16];
13 unsigned int res_num;
14 struct resource *res;
15 int busnum;
16 struct pci_sysdata sd;
17};
18
19static bool pci_use_crs = true;
20
21static int __init set_use_crs(const struct dmi_system_id *id)
22{
23 pci_use_crs = true;
24 return 0;
25}
26
27static int __init set_nouse_crs(const struct dmi_system_id *id)
28{
29 pci_use_crs = false;
30 return 0;
31}
32
33static const struct dmi_system_id pci_use_crs_table[] __initconst = {
34 /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
35 {
36 .callback = set_use_crs,
37 .ident = "IBM System x3800",
38 .matches = {
39 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
40 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
41 },
42 },
43 /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
44 /* 2006 AMD HT/VIA system with two host bridges */
45 {
46 .callback = set_use_crs,
47 .ident = "ASRock ALiveSATA2-GLAN",
48 .matches = {
49 DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
50 },
51 },
52 /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
53 /* 2006 AMD HT/VIA system with two host bridges */
54 {
55 .callback = set_use_crs,
56 .ident = "ASUS M2V-MX SE",
57 .matches = {
58 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
59 DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
60 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
61 },
62 },
63 /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
64 {
65 .callback = set_use_crs,
66 .ident = "MSI MS-7253",
67 .matches = {
68 DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
69 DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
70 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
71 },
72 },
73
74 /* Now for the blacklist.. */
75
76 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
77 {
78 .callback = set_nouse_crs,
79 .ident = "Dell Studio 1557",
80 .matches = {
81 DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
82 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
83 DMI_MATCH(DMI_BIOS_VERSION, "A09"),
84 },
85 },
86 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
87 {
88 .callback = set_nouse_crs,
89 .ident = "Thinkpad SL510",
90 .matches = {
91 DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
92 DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
93 DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
94 },
95 },
96 {}
97};
98
99void __init pci_acpi_crs_quirks(void)
100{
101 int year;
102
103 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
104 pci_use_crs = false;
105
106 dmi_check_system(pci_use_crs_table);
107
108 /*
109 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
110 * takes precedence over anything we figured out above.
111 */
112 if (pci_probe & PCI_ROOT_NO_CRS)
113 pci_use_crs = false;
114 else if (pci_probe & PCI_USE__CRS)
115 pci_use_crs = true;
116
117 printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
118 "if necessary, use \"pci=%s\" and report a bug\n",
119 pci_use_crs ? "Using" : "Ignoring",
120 pci_use_crs ? "nocrs" : "use_crs");
121}
122
123static acpi_status
124resource_to_addr(struct acpi_resource *resource,
125 struct acpi_resource_address64 *addr)
126{
127 acpi_status status;
128 struct acpi_resource_memory24 *memory24;
129 struct acpi_resource_memory32 *memory32;
130 struct acpi_resource_fixed_memory32 *fixed_memory32;
131
132 memset(addr, 0, sizeof(*addr));
133 switch (resource->type) {
134 case ACPI_RESOURCE_TYPE_MEMORY24:
135 memory24 = &resource->data.memory24;
136 addr->resource_type = ACPI_MEMORY_RANGE;
137 addr->minimum = memory24->minimum;
138 addr->address_length = memory24->address_length;
139 addr->maximum = addr->minimum + addr->address_length - 1;
140 return AE_OK;
141 case ACPI_RESOURCE_TYPE_MEMORY32:
142 memory32 = &resource->data.memory32;
143 addr->resource_type = ACPI_MEMORY_RANGE;
144 addr->minimum = memory32->minimum;
145 addr->address_length = memory32->address_length;
146 addr->maximum = addr->minimum + addr->address_length - 1;
147 return AE_OK;
148 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
149 fixed_memory32 = &resource->data.fixed_memory32;
150 addr->resource_type = ACPI_MEMORY_RANGE;
151 addr->minimum = fixed_memory32->address;
152 addr->address_length = fixed_memory32->address_length;
153 addr->maximum = addr->minimum + addr->address_length - 1;
154 return AE_OK;
155 case ACPI_RESOURCE_TYPE_ADDRESS16:
156 case ACPI_RESOURCE_TYPE_ADDRESS32:
157 case ACPI_RESOURCE_TYPE_ADDRESS64:
158 status = acpi_resource_to_address64(resource, addr);
159 if (ACPI_SUCCESS(status) &&
160 (addr->resource_type == ACPI_MEMORY_RANGE ||
161 addr->resource_type == ACPI_IO_RANGE) &&
162 addr->address_length > 0) {
163 return AE_OK;
164 }
165 break;
166 }
167 return AE_ERROR;
168}
169
170static acpi_status
171count_resource(struct acpi_resource *acpi_res, void *data)
172{
173 struct pci_root_info *info = data;
174 struct acpi_resource_address64 addr;
175 acpi_status status;
176
177 status = resource_to_addr(acpi_res, &addr);
178 if (ACPI_SUCCESS(status))
179 info->res_num++;
180 return AE_OK;
181}
182
183static acpi_status
184setup_resource(struct acpi_resource *acpi_res, void *data)
185{
186 struct pci_root_info *info = data;
187 struct resource *res;
188 struct acpi_resource_address64 addr;
189 acpi_status status;
190 unsigned long flags;
191 u64 start, orig_end, end;
192
193 status = resource_to_addr(acpi_res, &addr);
194 if (!ACPI_SUCCESS(status))
195 return AE_OK;
196
197 if (addr.resource_type == ACPI_MEMORY_RANGE) {
198 flags = IORESOURCE_MEM;
199 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
200 flags |= IORESOURCE_PREFETCH;
201 } else if (addr.resource_type == ACPI_IO_RANGE) {
202 flags = IORESOURCE_IO;
203 } else
204 return AE_OK;
205
206 start = addr.minimum + addr.translation_offset;
207 orig_end = end = addr.maximum + addr.translation_offset;
208
209 /* Exclude non-addressable range or non-addressable portion of range */
210 end = min(end, (u64)iomem_resource.end);
211 if (end <= start) {
212 dev_info(&info->bridge->dev,
213 "host bridge window [%#llx-%#llx] "
214 "(ignored, not CPU addressable)\n", start, orig_end);
215 return AE_OK;
216 } else if (orig_end != end) {
217 dev_info(&info->bridge->dev,
218 "host bridge window [%#llx-%#llx] "
219 "([%#llx-%#llx] ignored, not CPU addressable)\n",
220 start, orig_end, end + 1, orig_end);
221 }
222
223 res = &info->res[info->res_num];
224 res->name = info->name;
225 res->flags = flags;
226 res->start = start;
227 res->end = end;
228 res->child = NULL;
229
230 if (!pci_use_crs) {
231 dev_printk(KERN_DEBUG, &info->bridge->dev,
232 "host bridge window %pR (ignored)\n", res);
233 return AE_OK;
234 }
235
236 info->res_num++;
237 if (addr.translation_offset)
238 dev_info(&info->bridge->dev, "host bridge window %pR "
239 "(PCI address [%#llx-%#llx])\n",
240 res, res->start - addr.translation_offset,
241 res->end - addr.translation_offset);
242 else
243 dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
244
245 return AE_OK;
246}
247
248static void coalesce_windows(struct pci_root_info *info, unsigned long type)
249{
250 int i, j;
251 struct resource *res1, *res2;
252
253 for (i = 0; i < info->res_num; i++) {
254 res1 = &info->res[i];
255 if (!(res1->flags & type))
256 continue;
257
258 for (j = i + 1; j < info->res_num; j++) {
259 res2 = &info->res[j];
260 if (!(res2->flags & type))
261 continue;
262
263 /*
264 * I don't like throwing away windows because then
265 * our resources no longer match the ACPI _CRS, but
266 * the kernel resource tree doesn't allow overlaps.
267 */
268 if (resource_overlaps(res1, res2)) {
269 res1->start = min(res1->start, res2->start);
270 res1->end = max(res1->end, res2->end);
271 dev_info(&info->bridge->dev,
272 "host bridge window expanded to %pR; %pR ignored\n",
273 res1, res2);
274 res2->flags = 0;
275 }
276 }
277 }
278}
279
280static void add_resources(struct pci_root_info *info,
281 struct list_head *resources)
282{
283 int i;
284 struct resource *res, *root, *conflict;
285
286 coalesce_windows(info, IORESOURCE_MEM);
287 coalesce_windows(info, IORESOURCE_IO);
288
289 for (i = 0; i < info->res_num; i++) {
290 res = &info->res[i];
291
292 if (res->flags & IORESOURCE_MEM)
293 root = &iomem_resource;
294 else if (res->flags & IORESOURCE_IO)
295 root = &ioport_resource;
296 else
297 continue;
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 else
305 pci_add_resource(resources, res);
306 }
307}
308
309static void free_pci_root_info_res(struct pci_root_info *info)
310{
311 kfree(info->res);
312 info->res = NULL;
313 info->res_num = 0;
314}
315
316static void __release_pci_root_info(struct pci_root_info *info)
317{
318 int i;
319 struct resource *res;
320
321 for (i = 0; i < info->res_num; i++) {
322 res = &info->res[i];
323
324 if (!res->parent)
325 continue;
326
327 if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
328 continue;
329
330 release_resource(res);
331 }
332
333 free_pci_root_info_res(info);
334
335 kfree(info);
336}
337static void release_pci_root_info(struct pci_host_bridge *bridge)
338{
339 struct pci_root_info *info = bridge->release_data;
340
341 __release_pci_root_info(info);
342}
343
344static void
345probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
346 int busnum, int domain)
347{
348 size_t size;
349
350 info->bridge = device;
351 info->res_num = 0;
352 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
353 info);
354 if (!info->res_num)
355 return;
356
357 size = sizeof(*info->res) * info->res_num;
358 info->res_num = 0;
359 info->res = kmalloc(size, GFP_KERNEL);
360 if (!info->res)
361 return;
362
363 sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
364
365 acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
366 info);
367}
368
369struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
370{
371 struct acpi_device *device = root->device;
372 struct pci_root_info *info = NULL;
373 int domain = root->segment;
374 int busnum = root->secondary.start;
375 LIST_HEAD(resources);
376 struct pci_bus *bus;
377 struct pci_sysdata *sd;
378 int node;
379#ifdef CONFIG_ACPI_NUMA
380 int pxm;
381#endif
382
383 if (domain && !pci_domains_supported) {
384 printk(KERN_WARNING "pci_bus %04x:%02x: "
385 "ignored (multiple domains not supported)\n",
386 domain, busnum);
387 return NULL;
388 }
389
390 node = -1;
391#ifdef CONFIG_ACPI_NUMA
392 pxm = acpi_get_pxm(device->handle);
393 if (pxm >= 0)
394 node = pxm_to_node(pxm);
395 if (node != -1)
396 set_mp_bus_to_node(busnum, node);
397 else
398#endif
399 node = get_mp_bus_to_node(busnum);
400
401 if (node != -1 && !node_online(node))
402 node = -1;
403
404 info = kzalloc(sizeof(*info), GFP_KERNEL);
405 if (!info) {
406 printk(KERN_WARNING "pci_bus %04x:%02x: "
407 "ignored (out of memory)\n", domain, busnum);
408 return NULL;
409 }
410
411 sd = &info->sd;
412 sd->domain = domain;
413 sd->node = node;
414 /*
415 * Maybe the desired pci bus has been already scanned. In such case
416 * it is unnecessary to scan the pci bus with the given domain,busnum.
417 */
418 bus = pci_find_bus(domain, busnum);
419 if (bus) {
420 /*
421 * If the desired bus exits, the content of bus->sysdata will
422 * be replaced by sd.
423 */
424 memcpy(bus->sysdata, sd, sizeof(*sd));
425 kfree(info);
426 } else {
427 probe_pci_root_info(info, device, busnum, domain);
428
429 /*
430 * _CRS with no apertures is normal, so only fall back to
431 * defaults or native bridge info if we're ignoring _CRS.
432 */
433 if (pci_use_crs)
434 add_resources(info, &resources);
435 else {
436 free_pci_root_info_res(info);
437 x86_pci_root_bus_resources(busnum, &resources);
438 }
439
440 bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
441 &resources);
442 if (bus) {
443 bus->subordinate = pci_scan_child_bus(bus);
444 pci_set_host_bridge_release(
445 to_pci_host_bridge(bus->bridge),
446 release_pci_root_info, info);
447 } else {
448 pci_free_resource_list(&resources);
449 __release_pci_root_info(info);
450 }
451 }
452
453 /* After the PCI-E bus has been walked and all devices discovered,
454 * configure any settings of the fabric that might be necessary.
455 */
456 if (bus) {
457 struct pci_bus *child;
458 list_for_each_entry(child, &bus->children, node) {
459 struct pci_dev *self = child->self;
460 if (!self)
461 continue;
462
463 pcie_bus_configure_settings(child, self->pcie_mpss);
464 }
465 }
466
467 if (bus && node != -1) {
468#ifdef CONFIG_ACPI_NUMA
469 if (pxm >= 0)
470 dev_printk(KERN_DEBUG, &bus->dev,
471 "on NUMA node %d (pxm %d)\n", node, pxm);
472#else
473 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
474#endif
475 }
476
477 return bus;
478}
479
480int __init pci_acpi_init(void)
481{
482 struct pci_dev *dev = NULL;
483
484 if (acpi_noirq)
485 return -ENODEV;
486
487 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
488 acpi_irq_penalty_init();
489 pcibios_enable_irq = acpi_pci_irq_enable;
490 pcibios_disable_irq = acpi_pci_irq_disable;
491 x86_init.pci.init_irq = x86_init_noop;
492
493 if (pci_routeirq) {
494 /*
495 * PCI IRQ routing is set up by pci_enable_device(), but we
496 * also do it here in case there are still broken drivers that
497 * don't use pci_enable_device().
498 */
499 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
500 for_each_pci_dev(dev)
501 acpi_pci_irq_enable(dev);
502 }
503
504 return 0;
505}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/pci.h>
3#include <linux/acpi.h>
4#include <linux/init.h>
5#include <linux/irq.h>
6#include <linux/dmi.h>
7#include <linux/slab.h>
8#include <linux/pci-acpi.h>
9#include <asm/numa.h>
10#include <asm/pci_x86.h>
11
12struct pci_root_info {
13 struct acpi_pci_root_info common;
14 struct pci_sysdata sd;
15#ifdef CONFIG_PCI_MMCONFIG
16 bool mcfg_added;
17 u8 start_bus;
18 u8 end_bus;
19#endif
20};
21
22static bool pci_use_crs = true;
23static bool pci_ignore_seg = false;
24
25static int __init set_use_crs(const struct dmi_system_id *id)
26{
27 pci_use_crs = true;
28 return 0;
29}
30
31static int __init set_nouse_crs(const struct dmi_system_id *id)
32{
33 pci_use_crs = false;
34 return 0;
35}
36
37static 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
44static 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 /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
85 /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
86 {
87 .callback = set_use_crs,
88 .ident = "Foxconn K8M890-8237A",
89 .matches = {
90 DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
91 DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
92 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
93 },
94 },
95
96 /* Now for the blacklist.. */
97
98 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
99 {
100 .callback = set_nouse_crs,
101 .ident = "Dell Studio 1557",
102 .matches = {
103 DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
104 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
105 DMI_MATCH(DMI_BIOS_VERSION, "A09"),
106 },
107 },
108 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
109 {
110 .callback = set_nouse_crs,
111 .ident = "Thinkpad SL510",
112 .matches = {
113 DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
114 DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
115 DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
116 },
117 },
118 /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
119 {
120 .callback = set_nouse_crs,
121 .ident = "Supermicro X8DTH",
122 .matches = {
123 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
124 DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
125 DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
126 },
127 },
128
129 /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
130 {
131 .callback = set_ignore_seg,
132 .ident = "HP xw9300",
133 .matches = {
134 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
135 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
136 },
137 },
138 {}
139};
140
141void __init pci_acpi_crs_quirks(void)
142{
143 int year = dmi_get_bios_year();
144
145 if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff)
146 pci_use_crs = false;
147
148 dmi_check_system(pci_crs_quirks);
149
150 /*
151 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
152 * takes precedence over anything we figured out above.
153 */
154 if (pci_probe & PCI_ROOT_NO_CRS)
155 pci_use_crs = false;
156 else if (pci_probe & PCI_USE__CRS)
157 pci_use_crs = true;
158
159 printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
160 "if necessary, use \"pci=%s\" and report a bug\n",
161 pci_use_crs ? "Using" : "Ignoring",
162 pci_use_crs ? "nocrs" : "use_crs");
163}
164
165#ifdef CONFIG_PCI_MMCONFIG
166static int check_segment(u16 seg, struct device *dev, char *estr)
167{
168 if (seg) {
169 dev_err(dev,
170 "%s can't access PCI configuration "
171 "space under this host bridge.\n",
172 estr);
173 return -EIO;
174 }
175
176 /*
177 * Failure in adding MMCFG information is not fatal,
178 * just can't access extended configuration space of
179 * devices under this host bridge.
180 */
181 dev_warn(dev,
182 "%s can't access extended PCI configuration "
183 "space under this bridge.\n",
184 estr);
185
186 return 0;
187}
188
189static int setup_mcfg_map(struct acpi_pci_root_info *ci)
190{
191 int result, seg;
192 struct pci_root_info *info;
193 struct acpi_pci_root *root = ci->root;
194 struct device *dev = &ci->bridge->dev;
195
196 info = container_of(ci, struct pci_root_info, common);
197 info->start_bus = (u8)root->secondary.start;
198 info->end_bus = (u8)root->secondary.end;
199 info->mcfg_added = false;
200 seg = info->sd.domain;
201
202 /* return success if MMCFG is not in use */
203 if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
204 return 0;
205
206 if (!(pci_probe & PCI_PROBE_MMCONF))
207 return check_segment(seg, dev, "MMCONFIG is disabled,");
208
209 result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
210 root->mcfg_addr);
211 if (result == 0) {
212 /* enable MMCFG if it hasn't been enabled yet */
213 if (raw_pci_ext_ops == NULL)
214 raw_pci_ext_ops = &pci_mmcfg;
215 info->mcfg_added = true;
216 } else if (result != -EEXIST)
217 return check_segment(seg, dev,
218 "fail to add MMCONFIG information,");
219
220 return 0;
221}
222
223static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
224{
225 struct pci_root_info *info;
226
227 info = container_of(ci, struct pci_root_info, common);
228 if (info->mcfg_added) {
229 pci_mmconfig_delete(info->sd.domain,
230 info->start_bus, info->end_bus);
231 info->mcfg_added = false;
232 }
233}
234#else
235static int setup_mcfg_map(struct acpi_pci_root_info *ci)
236{
237 return 0;
238}
239
240static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
241{
242}
243#endif
244
245static int pci_acpi_root_get_node(struct acpi_pci_root *root)
246{
247 int busnum = root->secondary.start;
248 struct acpi_device *device = root->device;
249 int node = acpi_get_node(device->handle);
250
251 if (node == NUMA_NO_NODE) {
252 node = x86_pci_root_bus_node(busnum);
253 if (node != 0 && node != NUMA_NO_NODE)
254 dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
255 node);
256 }
257 if (node != NUMA_NO_NODE && !node_online(node))
258 node = NUMA_NO_NODE;
259
260 return node;
261}
262
263static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
264{
265 return setup_mcfg_map(ci);
266}
267
268static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
269{
270 teardown_mcfg_map(ci);
271 kfree(container_of(ci, struct pci_root_info, common));
272}
273
274/*
275 * An IO port or MMIO resource assigned to a PCI host bridge may be
276 * consumed by the host bridge itself or available to its child
277 * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
278 * to tell whether the resource is consumed by the host bridge itself,
279 * but firmware hasn't used that bit consistently, so we can't rely on it.
280 *
281 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
282 * to be available to child bus/devices except one special case:
283 * IO port [0xCF8-0xCFF] is consumed by the host bridge itself
284 * to access PCI configuration space.
285 *
286 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
287 */
288static bool resource_is_pcicfg_ioport(struct resource *res)
289{
290 return (res->flags & IORESOURCE_IO) &&
291 res->start == 0xCF8 && res->end == 0xCFF;
292}
293
294static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
295{
296 struct acpi_device *device = ci->bridge;
297 int busnum = ci->root->secondary.start;
298 struct resource_entry *entry, *tmp;
299 int status;
300
301 status = acpi_pci_probe_root_resources(ci);
302 if (pci_use_crs) {
303 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
304 if (resource_is_pcicfg_ioport(entry->res))
305 resource_list_destroy_entry(entry);
306 return status;
307 }
308
309 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
310 dev_printk(KERN_DEBUG, &device->dev,
311 "host bridge window %pR (ignored)\n", entry->res);
312 resource_list_destroy_entry(entry);
313 }
314 x86_pci_root_bus_resources(busnum, &ci->resources);
315
316 return 0;
317}
318
319static struct acpi_pci_root_ops acpi_pci_root_ops = {
320 .pci_ops = &pci_root_ops,
321 .init_info = pci_acpi_root_init_info,
322 .release_info = pci_acpi_root_release_info,
323 .prepare_resources = pci_acpi_root_prepare_resources,
324};
325
326struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
327{
328 int domain = root->segment;
329 int busnum = root->secondary.start;
330 int node = pci_acpi_root_get_node(root);
331 struct pci_bus *bus;
332
333 if (pci_ignore_seg)
334 root->segment = domain = 0;
335
336 if (domain && !pci_domains_supported) {
337 printk(KERN_WARNING "pci_bus %04x:%02x: "
338 "ignored (multiple domains not supported)\n",
339 domain, busnum);
340 return NULL;
341 }
342
343 bus = pci_find_bus(domain, busnum);
344 if (bus) {
345 /*
346 * If the desired bus has been scanned already, replace
347 * its bus->sysdata.
348 */
349 struct pci_sysdata sd = {
350 .domain = domain,
351 .node = node,
352 .companion = root->device
353 };
354
355 memcpy(bus->sysdata, &sd, sizeof(sd));
356 } else {
357 struct pci_root_info *info;
358
359 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
360 if (!info)
361 dev_err(&root->device->dev,
362 "pci_bus %04x:%02x: ignored (out of memory)\n",
363 domain, busnum);
364 else {
365 info->sd.domain = domain;
366 info->sd.node = node;
367 info->sd.companion = root->device;
368 bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
369 &info->common, &info->sd);
370 }
371 }
372
373 /* After the PCI-E bus has been walked and all devices discovered,
374 * configure any settings of the fabric that might be necessary.
375 */
376 if (bus) {
377 struct pci_bus *child;
378 list_for_each_entry(child, &bus->children, node)
379 pcie_bus_configure_settings(child);
380 }
381
382 return bus;
383}
384
385int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
386{
387 /*
388 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
389 * here, pci_create_root_bus() has been called by someone else and
390 * sysdata is likely to be different from what we expect. Let it go in
391 * that case.
392 */
393 if (!bridge->dev.parent) {
394 struct pci_sysdata *sd = bridge->bus->sysdata;
395 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
396 }
397 return 0;
398}
399
400int __init pci_acpi_init(void)
401{
402 struct pci_dev *dev = NULL;
403
404 if (acpi_noirq)
405 return -ENODEV;
406
407 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
408 acpi_irq_penalty_init();
409 pcibios_enable_irq = acpi_pci_irq_enable;
410 pcibios_disable_irq = acpi_pci_irq_disable;
411 x86_init.pci.init_irq = x86_init_noop;
412
413 if (pci_routeirq) {
414 /*
415 * PCI IRQ routing is set up by pci_enable_device(), but we
416 * also do it here in case there are still broken drivers that
417 * don't use pci_enable_device().
418 */
419 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
420 for_each_pci_dev(dev)
421 acpi_pci_irq_enable(dev);
422 }
423
424 return 0;
425}