tipc: fix bug in link failover handling
[linux-2.6-microblaze.git] / arch / x86 / pci / acpi.c
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 }