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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(sizeof(*info), GFP_KERNEL);
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}
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 <linux/pci-acpi.h>
8#include <asm/numa.h>
9#include <asm/pci_x86.h>
10
11struct pci_root_info {
12 struct acpi_pci_root_info common;
13 struct pci_sysdata sd;
14#ifdef CONFIG_PCI_MMCONFIG
15 bool mcfg_added;
16 u8 start_bus;
17 u8 end_bus;
18#endif
19};
20
21static bool pci_use_crs = true;
22static bool pci_ignore_seg = false;
23
24static int __init set_use_crs(const struct dmi_system_id *id)
25{
26 pci_use_crs = true;
27 return 0;
28}
29
30static int __init set_nouse_crs(const struct dmi_system_id *id)
31{
32 pci_use_crs = false;
33 return 0;
34}
35
36static int __init set_ignore_seg(const struct dmi_system_id *id)
37{
38 printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
39 pci_ignore_seg = true;
40 return 0;
41}
42
43static const struct dmi_system_id pci_crs_quirks[] __initconst = {
44 /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
45 {
46 .callback = set_use_crs,
47 .ident = "IBM System x3800",
48 .matches = {
49 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
50 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
51 },
52 },
53 /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
54 /* 2006 AMD HT/VIA system with two host bridges */
55 {
56 .callback = set_use_crs,
57 .ident = "ASRock ALiveSATA2-GLAN",
58 .matches = {
59 DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
60 },
61 },
62 /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
63 /* 2006 AMD HT/VIA system with two host bridges */
64 {
65 .callback = set_use_crs,
66 .ident = "ASUS M2V-MX SE",
67 .matches = {
68 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
69 DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
70 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
71 },
72 },
73 /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
74 {
75 .callback = set_use_crs,
76 .ident = "MSI MS-7253",
77 .matches = {
78 DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
79 DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
80 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
81 },
82 },
83 /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
84 /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
85 {
86 .callback = set_use_crs,
87 .ident = "Foxconn K8M890-8237A",
88 .matches = {
89 DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
90 DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
91 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
92 },
93 },
94
95 /* Now for the blacklist.. */
96
97 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
98 {
99 .callback = set_nouse_crs,
100 .ident = "Dell Studio 1557",
101 .matches = {
102 DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
103 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
104 DMI_MATCH(DMI_BIOS_VERSION, "A09"),
105 },
106 },
107 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
108 {
109 .callback = set_nouse_crs,
110 .ident = "Thinkpad SL510",
111 .matches = {
112 DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
113 DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
114 DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
115 },
116 },
117
118 /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
119 {
120 .callback = set_ignore_seg,
121 .ident = "HP xw9300",
122 .matches = {
123 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
124 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
125 },
126 },
127 {}
128};
129
130void __init pci_acpi_crs_quirks(void)
131{
132 int year;
133
134 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
135 if (iomem_resource.end <= 0xffffffff)
136 pci_use_crs = false;
137 }
138
139 dmi_check_system(pci_crs_quirks);
140
141 /*
142 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
143 * takes precedence over anything we figured out above.
144 */
145 if (pci_probe & PCI_ROOT_NO_CRS)
146 pci_use_crs = false;
147 else if (pci_probe & PCI_USE__CRS)
148 pci_use_crs = true;
149
150 printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
151 "if necessary, use \"pci=%s\" and report a bug\n",
152 pci_use_crs ? "Using" : "Ignoring",
153 pci_use_crs ? "nocrs" : "use_crs");
154}
155
156#ifdef CONFIG_PCI_MMCONFIG
157static int check_segment(u16 seg, struct device *dev, char *estr)
158{
159 if (seg) {
160 dev_err(dev,
161 "%s can't access PCI configuration "
162 "space under this host bridge.\n",
163 estr);
164 return -EIO;
165 }
166
167 /*
168 * Failure in adding MMCFG information is not fatal,
169 * just can't access extended configuration space of
170 * devices under this host bridge.
171 */
172 dev_warn(dev,
173 "%s can't access extended PCI configuration "
174 "space under this bridge.\n",
175 estr);
176
177 return 0;
178}
179
180static int setup_mcfg_map(struct acpi_pci_root_info *ci)
181{
182 int result, seg;
183 struct pci_root_info *info;
184 struct acpi_pci_root *root = ci->root;
185 struct device *dev = &ci->bridge->dev;
186
187 info = container_of(ci, struct pci_root_info, common);
188 info->start_bus = (u8)root->secondary.start;
189 info->end_bus = (u8)root->secondary.end;
190 info->mcfg_added = false;
191 seg = info->sd.domain;
192
193 /* return success if MMCFG is not in use */
194 if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
195 return 0;
196
197 if (!(pci_probe & PCI_PROBE_MMCONF))
198 return check_segment(seg, dev, "MMCONFIG is disabled,");
199
200 result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
201 root->mcfg_addr);
202 if (result == 0) {
203 /* enable MMCFG if it hasn't been enabled yet */
204 if (raw_pci_ext_ops == NULL)
205 raw_pci_ext_ops = &pci_mmcfg;
206 info->mcfg_added = true;
207 } else if (result != -EEXIST)
208 return check_segment(seg, dev,
209 "fail to add MMCONFIG information,");
210
211 return 0;
212}
213
214static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
215{
216 struct pci_root_info *info;
217
218 info = container_of(ci, struct pci_root_info, common);
219 if (info->mcfg_added) {
220 pci_mmconfig_delete(info->sd.domain,
221 info->start_bus, info->end_bus);
222 info->mcfg_added = false;
223 }
224}
225#else
226static int setup_mcfg_map(struct acpi_pci_root_info *ci)
227{
228 return 0;
229}
230
231static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
232{
233}
234#endif
235
236static int pci_acpi_root_get_node(struct acpi_pci_root *root)
237{
238 int busnum = root->secondary.start;
239 struct acpi_device *device = root->device;
240 int node = acpi_get_node(device->handle);
241
242 if (node == NUMA_NO_NODE) {
243 node = x86_pci_root_bus_node(busnum);
244 if (node != 0 && node != NUMA_NO_NODE)
245 dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
246 node);
247 }
248 if (node != NUMA_NO_NODE && !node_online(node))
249 node = NUMA_NO_NODE;
250
251 return node;
252}
253
254static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
255{
256 return setup_mcfg_map(ci);
257}
258
259static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
260{
261 teardown_mcfg_map(ci);
262 kfree(container_of(ci, struct pci_root_info, common));
263}
264
265/*
266 * An IO port or MMIO resource assigned to a PCI host bridge may be
267 * consumed by the host bridge itself or available to its child
268 * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
269 * to tell whether the resource is consumed by the host bridge itself,
270 * but firmware hasn't used that bit consistently, so we can't rely on it.
271 *
272 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
273 * to be available to child bus/devices except one special case:
274 * IO port [0xCF8-0xCFF] is consumed by the host bridge itself
275 * to access PCI configuration space.
276 *
277 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
278 */
279static bool resource_is_pcicfg_ioport(struct resource *res)
280{
281 return (res->flags & IORESOURCE_IO) &&
282 res->start == 0xCF8 && res->end == 0xCFF;
283}
284
285static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
286{
287 struct acpi_device *device = ci->bridge;
288 int busnum = ci->root->secondary.start;
289 struct resource_entry *entry, *tmp;
290 int status;
291
292 status = acpi_pci_probe_root_resources(ci);
293 if (pci_use_crs) {
294 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
295 if (resource_is_pcicfg_ioport(entry->res))
296 resource_list_destroy_entry(entry);
297 return status;
298 }
299
300 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
301 dev_printk(KERN_DEBUG, &device->dev,
302 "host bridge window %pR (ignored)\n", entry->res);
303 resource_list_destroy_entry(entry);
304 }
305 x86_pci_root_bus_resources(busnum, &ci->resources);
306
307 return 0;
308}
309
310static struct acpi_pci_root_ops acpi_pci_root_ops = {
311 .pci_ops = &pci_root_ops,
312 .init_info = pci_acpi_root_init_info,
313 .release_info = pci_acpi_root_release_info,
314 .prepare_resources = pci_acpi_root_prepare_resources,
315};
316
317struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
318{
319 int domain = root->segment;
320 int busnum = root->secondary.start;
321 int node = pci_acpi_root_get_node(root);
322 struct pci_bus *bus;
323
324 if (pci_ignore_seg)
325 root->segment = domain = 0;
326
327 if (domain && !pci_domains_supported) {
328 printk(KERN_WARNING "pci_bus %04x:%02x: "
329 "ignored (multiple domains not supported)\n",
330 domain, busnum);
331 return NULL;
332 }
333
334 bus = pci_find_bus(domain, busnum);
335 if (bus) {
336 /*
337 * If the desired bus has been scanned already, replace
338 * its bus->sysdata.
339 */
340 struct pci_sysdata sd = {
341 .domain = domain,
342 .node = node,
343 .companion = root->device
344 };
345
346 memcpy(bus->sysdata, &sd, sizeof(sd));
347 } else {
348 struct pci_root_info *info;
349
350 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
351 if (!info)
352 dev_err(&root->device->dev,
353 "pci_bus %04x:%02x: ignored (out of memory)\n",
354 domain, busnum);
355 else {
356 info->sd.domain = domain;
357 info->sd.node = node;
358 info->sd.companion = root->device;
359 bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
360 &info->common, &info->sd);
361 }
362 }
363
364 /* After the PCI-E bus has been walked and all devices discovered,
365 * configure any settings of the fabric that might be necessary.
366 */
367 if (bus) {
368 struct pci_bus *child;
369 list_for_each_entry(child, &bus->children, node)
370 pcie_bus_configure_settings(child);
371 }
372
373 return bus;
374}
375
376int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
377{
378 /*
379 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
380 * here, pci_create_root_bus() has been called by someone else and
381 * sysdata is likely to be different from what we expect. Let it go in
382 * that case.
383 */
384 if (!bridge->dev.parent) {
385 struct pci_sysdata *sd = bridge->bus->sysdata;
386 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
387 }
388 return 0;
389}
390
391int __init pci_acpi_init(void)
392{
393 struct pci_dev *dev = NULL;
394
395 if (acpi_noirq)
396 return -ENODEV;
397
398 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
399 acpi_irq_penalty_init();
400 pcibios_enable_irq = acpi_pci_irq_enable;
401 pcibios_disable_irq = acpi_pci_irq_disable;
402 x86_init.pci.init_irq = x86_init_noop;
403
404 if (pci_routeirq) {
405 /*
406 * PCI IRQ routing is set up by pci_enable_device(), but we
407 * also do it here in case there are still broken drivers that
408 * don't use pci_enable_device().
409 */
410 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
411 for_each_pci_dev(dev)
412 acpi_pci_irq_enable(dev);
413 }
414
415 return 0;
416}