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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;
13 unsigned int res_num;
14 struct resource *res;
15 struct pci_bus *bus;
16 int busnum;
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 const struct dmi_system_id pci_use_crs_table[] __initconst = {
28 /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
29 {
30 .callback = set_use_crs,
31 .ident = "IBM System x3800",
32 .matches = {
33 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
34 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
35 },
36 },
37 /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
38 /* 2006 AMD HT/VIA system with two host bridges */
39 {
40 .callback = set_use_crs,
41 .ident = "ASRock ALiveSATA2-GLAN",
42 .matches = {
43 DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
44 },
45 },
46 /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
47 /* 2006 AMD HT/VIA system with two host bridges */
48 {
49 .callback = set_use_crs,
50 .ident = "ASUS M2V-MX SE",
51 .matches = {
52 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
53 DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
54 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
55 },
56 },
57 {}
58};
59
60void __init pci_acpi_crs_quirks(void)
61{
62 int year;
63
64 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
65 pci_use_crs = false;
66
67 dmi_check_system(pci_use_crs_table);
68
69 /*
70 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
71 * takes precedence over anything we figured out above.
72 */
73 if (pci_probe & PCI_ROOT_NO_CRS)
74 pci_use_crs = false;
75 else if (pci_probe & PCI_USE__CRS)
76 pci_use_crs = true;
77
78 printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
79 "if necessary, use \"pci=%s\" and report a bug\n",
80 pci_use_crs ? "Using" : "Ignoring",
81 pci_use_crs ? "nocrs" : "use_crs");
82}
83
84static acpi_status
85resource_to_addr(struct acpi_resource *resource,
86 struct acpi_resource_address64 *addr)
87{
88 acpi_status status;
89 struct acpi_resource_memory24 *memory24;
90 struct acpi_resource_memory32 *memory32;
91 struct acpi_resource_fixed_memory32 *fixed_memory32;
92
93 memset(addr, 0, sizeof(*addr));
94 switch (resource->type) {
95 case ACPI_RESOURCE_TYPE_MEMORY24:
96 memory24 = &resource->data.memory24;
97 addr->resource_type = ACPI_MEMORY_RANGE;
98 addr->minimum = memory24->minimum;
99 addr->address_length = memory24->address_length;
100 addr->maximum = addr->minimum + addr->address_length - 1;
101 return AE_OK;
102 case ACPI_RESOURCE_TYPE_MEMORY32:
103 memory32 = &resource->data.memory32;
104 addr->resource_type = ACPI_MEMORY_RANGE;
105 addr->minimum = memory32->minimum;
106 addr->address_length = memory32->address_length;
107 addr->maximum = addr->minimum + addr->address_length - 1;
108 return AE_OK;
109 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
110 fixed_memory32 = &resource->data.fixed_memory32;
111 addr->resource_type = ACPI_MEMORY_RANGE;
112 addr->minimum = fixed_memory32->address;
113 addr->address_length = fixed_memory32->address_length;
114 addr->maximum = addr->minimum + addr->address_length - 1;
115 return AE_OK;
116 case ACPI_RESOURCE_TYPE_ADDRESS16:
117 case ACPI_RESOURCE_TYPE_ADDRESS32:
118 case ACPI_RESOURCE_TYPE_ADDRESS64:
119 status = acpi_resource_to_address64(resource, addr);
120 if (ACPI_SUCCESS(status) &&
121 (addr->resource_type == ACPI_MEMORY_RANGE ||
122 addr->resource_type == ACPI_IO_RANGE) &&
123 addr->address_length > 0) {
124 return AE_OK;
125 }
126 break;
127 }
128 return AE_ERROR;
129}
130
131static acpi_status
132count_resource(struct acpi_resource *acpi_res, void *data)
133{
134 struct pci_root_info *info = data;
135 struct acpi_resource_address64 addr;
136 acpi_status status;
137
138 status = resource_to_addr(acpi_res, &addr);
139 if (ACPI_SUCCESS(status))
140 info->res_num++;
141 return AE_OK;
142}
143
144static acpi_status
145setup_resource(struct acpi_resource *acpi_res, void *data)
146{
147 struct pci_root_info *info = data;
148 struct resource *res;
149 struct acpi_resource_address64 addr;
150 acpi_status status;
151 unsigned long flags;
152 u64 start, end;
153
154 status = resource_to_addr(acpi_res, &addr);
155 if (!ACPI_SUCCESS(status))
156 return AE_OK;
157
158 if (addr.resource_type == ACPI_MEMORY_RANGE) {
159 flags = IORESOURCE_MEM;
160 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
161 flags |= IORESOURCE_PREFETCH;
162 } else if (addr.resource_type == ACPI_IO_RANGE) {
163 flags = IORESOURCE_IO;
164 } else
165 return AE_OK;
166
167 start = addr.minimum + addr.translation_offset;
168 end = addr.maximum + addr.translation_offset;
169
170 res = &info->res[info->res_num];
171 res->name = info->name;
172 res->flags = flags;
173 res->start = start;
174 res->end = end;
175 res->child = NULL;
176
177 if (!pci_use_crs) {
178 dev_printk(KERN_DEBUG, &info->bridge->dev,
179 "host bridge window %pR (ignored)\n", res);
180 return AE_OK;
181 }
182
183 info->res_num++;
184 if (addr.translation_offset)
185 dev_info(&info->bridge->dev, "host bridge window %pR "
186 "(PCI address [%#llx-%#llx])\n",
187 res, res->start - addr.translation_offset,
188 res->end - addr.translation_offset);
189 else
190 dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
191
192 return AE_OK;
193}
194
195static bool resource_contains(struct resource *res, resource_size_t point)
196{
197 if (res->start <= point && point <= res->end)
198 return true;
199 return false;
200}
201
202static void coalesce_windows(struct pci_root_info *info, unsigned long type)
203{
204 int i, j;
205 struct resource *res1, *res2;
206
207 for (i = 0; i < info->res_num; i++) {
208 res1 = &info->res[i];
209 if (!(res1->flags & type))
210 continue;
211
212 for (j = i + 1; j < info->res_num; j++) {
213 res2 = &info->res[j];
214 if (!(res2->flags & type))
215 continue;
216
217 /*
218 * I don't like throwing away windows because then
219 * our resources no longer match the ACPI _CRS, but
220 * the kernel resource tree doesn't allow overlaps.
221 */
222 if (resource_contains(res1, res2->start) ||
223 resource_contains(res1, res2->end) ||
224 resource_contains(res2, res1->start) ||
225 resource_contains(res2, res1->end)) {
226 res1->start = min(res1->start, res2->start);
227 res1->end = max(res1->end, res2->end);
228 dev_info(&info->bridge->dev,
229 "host bridge window expanded to %pR; %pR ignored\n",
230 res1, res2);
231 res2->flags = 0;
232 }
233 }
234 }
235}
236
237static void add_resources(struct pci_root_info *info)
238{
239 int i;
240 struct resource *res, *root, *conflict;
241
242 if (!pci_use_crs)
243 return;
244
245 coalesce_windows(info, IORESOURCE_MEM);
246 coalesce_windows(info, IORESOURCE_IO);
247
248 for (i = 0; i < info->res_num; i++) {
249 res = &info->res[i];
250
251 if (res->flags & IORESOURCE_MEM)
252 root = &iomem_resource;
253 else if (res->flags & IORESOURCE_IO)
254 root = &ioport_resource;
255 else
256 continue;
257
258 conflict = insert_resource_conflict(root, res);
259 if (conflict)
260 dev_info(&info->bridge->dev,
261 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
262 res, conflict->name, conflict);
263 else
264 pci_bus_add_resource(info->bus, res, 0);
265 }
266}
267
268static void
269get_current_resources(struct acpi_device *device, int busnum,
270 int domain, struct pci_bus *bus)
271{
272 struct pci_root_info info;
273 size_t size;
274
275 if (pci_use_crs)
276 pci_bus_remove_resources(bus);
277
278 info.bridge = device;
279 info.bus = bus;
280 info.res_num = 0;
281 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
282 &info);
283 if (!info.res_num)
284 return;
285
286 size = sizeof(*info.res) * info.res_num;
287 info.res = kmalloc(size, GFP_KERNEL);
288 if (!info.res)
289 goto res_alloc_fail;
290
291 info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
292 if (!info.name)
293 goto name_alloc_fail;
294
295 info.res_num = 0;
296 acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
297 &info);
298
299 add_resources(&info);
300 return;
301
302name_alloc_fail:
303 kfree(info.res);
304res_alloc_fail:
305 return;
306}
307
308struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
309{
310 struct acpi_device *device = root->device;
311 int domain = root->segment;
312 int busnum = root->secondary.start;
313 struct pci_bus *bus;
314 struct pci_sysdata *sd;
315 int node;
316#ifdef CONFIG_ACPI_NUMA
317 int pxm;
318#endif
319
320 if (domain && !pci_domains_supported) {
321 printk(KERN_WARNING "pci_bus %04x:%02x: "
322 "ignored (multiple domains not supported)\n",
323 domain, busnum);
324 return NULL;
325 }
326
327 node = -1;
328#ifdef CONFIG_ACPI_NUMA
329 pxm = acpi_get_pxm(device->handle);
330 if (pxm >= 0)
331 node = pxm_to_node(pxm);
332 if (node != -1)
333 set_mp_bus_to_node(busnum, node);
334 else
335#endif
336 node = get_mp_bus_to_node(busnum);
337
338 if (node != -1 && !node_online(node))
339 node = -1;
340
341 /* Allocate per-root-bus (not per bus) arch-specific data.
342 * TODO: leak; this memory is never freed.
343 * It's arguable whether it's worth the trouble to care.
344 */
345 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
346 if (!sd) {
347 printk(KERN_WARNING "pci_bus %04x:%02x: "
348 "ignored (out of memory)\n", domain, busnum);
349 return NULL;
350 }
351
352 sd->domain = domain;
353 sd->node = node;
354 /*
355 * Maybe the desired pci bus has been already scanned. In such case
356 * it is unnecessary to scan the pci bus with the given domain,busnum.
357 */
358 bus = pci_find_bus(domain, busnum);
359 if (bus) {
360 /*
361 * If the desired bus exits, the content of bus->sysdata will
362 * be replaced by sd.
363 */
364 memcpy(bus->sysdata, sd, sizeof(*sd));
365 kfree(sd);
366 } else {
367 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
368 if (bus) {
369 get_current_resources(device, busnum, domain, bus);
370 bus->subordinate = pci_scan_child_bus(bus);
371 }
372 }
373
374 /* After the PCI-E bus has been walked and all devices discovered,
375 * configure any settings of the fabric that might be necessary.
376 */
377 if (bus) {
378 struct pci_bus *child;
379 list_for_each_entry(child, &bus->children, node) {
380 struct pci_dev *self = child->self;
381 if (!self)
382 continue;
383
384 pcie_bus_configure_settings(child, self->pcie_mpss);
385 }
386 }
387
388 if (!bus)
389 kfree(sd);
390
391 if (bus && node != -1) {
392#ifdef CONFIG_ACPI_NUMA
393 if (pxm >= 0)
394 dev_printk(KERN_DEBUG, &bus->dev,
395 "on NUMA node %d (pxm %d)\n", node, pxm);
396#else
397 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
398#endif
399 }
400
401 return bus;
402}
403
404int __init pci_acpi_init(void)
405{
406 struct pci_dev *dev = NULL;
407
408 if (acpi_noirq)
409 return -ENODEV;
410
411 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
412 acpi_irq_penalty_init();
413 pcibios_enable_irq = acpi_pci_irq_enable;
414 pcibios_disable_irq = acpi_pci_irq_disable;
415 x86_init.pci.init_irq = x86_init_noop;
416
417 if (pci_routeirq) {
418 /*
419 * PCI IRQ routing is set up by pci_enable_device(), but we
420 * also do it here in case there are still broken drivers that
421 * don't use pci_enable_device().
422 */
423 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
424 for_each_pci_dev(dev)
425 acpi_pci_irq_enable(dev);
426 }
427
428 return 0;
429}
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}