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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
10 struct pci_root_info {
11         struct acpi_device *bridge;
12         char name[16];
13         unsigned int res_num;
14         struct resource *res;
15         struct pci_sysdata sd;
16 #ifdef  CONFIG_PCI_MMCONFIG
17         bool mcfg_added;
18         u16 segment;
19         u8 start_bus;
20         u8 end_bus;
21 #endif
22 };
23
24 static bool pci_use_crs = true;
25
26 static int __init set_use_crs(const struct dmi_system_id *id)
27 {
28         pci_use_crs = true;
29         return 0;
30 }
31
32 static int __init set_nouse_crs(const struct dmi_system_id *id)
33 {
34         pci_use_crs = false;
35         return 0;
36 }
37
38 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
39         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
40         {
41                 .callback = set_use_crs,
42                 .ident = "IBM System x3800",
43                 .matches = {
44                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
45                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
46                 },
47         },
48         /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
49         /* 2006 AMD HT/VIA system with two host bridges */
50         {
51                 .callback = set_use_crs,
52                 .ident = "ASRock ALiveSATA2-GLAN",
53                 .matches = {
54                         DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
55                 },
56         },
57         /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
58         /* 2006 AMD HT/VIA system with two host bridges */
59         {
60                 .callback = set_use_crs,
61                 .ident = "ASUS M2V-MX SE",
62                 .matches = {
63                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
64                         DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
65                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
66                 },
67         },
68         /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
69         {
70                 .callback = set_use_crs,
71                 .ident = "MSI MS-7253",
72                 .matches = {
73                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
74                         DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
75                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
76                 },
77         },
78
79         /* Now for the blacklist.. */
80
81         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
82         {
83                 .callback = set_nouse_crs,
84                 .ident = "Dell Studio 1557",
85                 .matches = {
86                         DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
87                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
88                         DMI_MATCH(DMI_BIOS_VERSION, "A09"),
89                 },
90         },
91         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
92         {
93                 .callback = set_nouse_crs,
94                 .ident = "Thinkpad SL510",
95                 .matches = {
96                         DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
97                         DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
98                         DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
99                 },
100         },
101         {}
102 };
103
104 void __init pci_acpi_crs_quirks(void)
105 {
106         int year;
107
108         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
109                 pci_use_crs = false;
110
111         dmi_check_system(pci_use_crs_table);
112
113         /*
114          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
115          * takes precedence over anything we figured out above.
116          */
117         if (pci_probe & PCI_ROOT_NO_CRS)
118                 pci_use_crs = false;
119         else if (pci_probe & PCI_USE__CRS)
120                 pci_use_crs = true;
121
122         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
123                "if necessary, use \"pci=%s\" and report a bug\n",
124                pci_use_crs ? "Using" : "Ignoring",
125                pci_use_crs ? "nocrs" : "use_crs");
126 }
127
128 #ifdef  CONFIG_PCI_MMCONFIG
129 static int __devinit check_segment(u16 seg, struct device *dev, char *estr)
130 {
131         if (seg) {
132                 dev_err(dev,
133                         "%s can't access PCI configuration "
134                         "space under this host bridge.\n",
135                         estr);
136                 return -EIO;
137         }
138
139         /*
140          * Failure in adding MMCFG information is not fatal,
141          * just can't access extended configuration space of
142          * devices under this host bridge.
143          */
144         dev_warn(dev,
145                  "%s can't access extended PCI configuration "
146                  "space under this bridge.\n",
147                  estr);
148
149         return 0;
150 }
151
152 static int __devinit setup_mcfg_map(struct pci_root_info *info,
153                                     u16 seg, u8 start, u8 end,
154                                     phys_addr_t addr)
155 {
156         int result;
157         struct device *dev = &info->bridge->dev;
158
159         info->start_bus = start;
160         info->end_bus = end;
161         info->mcfg_added = false;
162
163         /* return success if MMCFG is not in use */
164         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
165                 return 0;
166
167         if (!(pci_probe & PCI_PROBE_MMCONF))
168                 return check_segment(seg, dev, "MMCONFIG is disabled,");
169
170         result = pci_mmconfig_insert(dev, seg, start, end, addr);
171         if (result == 0) {
172                 /* enable MMCFG if it hasn't been enabled yet */
173                 if (raw_pci_ext_ops == NULL)
174                         raw_pci_ext_ops = &pci_mmcfg;
175                 info->mcfg_added = true;
176         } else if (result != -EEXIST)
177                 return check_segment(seg, dev,
178                          "fail to add MMCONFIG information,");
179
180         return 0;
181 }
182
183 static void teardown_mcfg_map(struct pci_root_info *info)
184 {
185         if (info->mcfg_added) {
186                 pci_mmconfig_delete(info->segment, info->start_bus,
187                                     info->end_bus);
188                 info->mcfg_added = false;
189         }
190 }
191 #else
192 static int __devinit setup_mcfg_map(struct pci_root_info *info,
193                                     u16 seg, u8 start, u8 end,
194                                     phys_addr_t addr)
195 {
196         return 0;
197 }
198 static void teardown_mcfg_map(struct pci_root_info *info)
199 {
200 }
201 #endif
202
203 static acpi_status
204 resource_to_addr(struct acpi_resource *resource,
205                         struct acpi_resource_address64 *addr)
206 {
207         acpi_status status;
208         struct acpi_resource_memory24 *memory24;
209         struct acpi_resource_memory32 *memory32;
210         struct acpi_resource_fixed_memory32 *fixed_memory32;
211
212         memset(addr, 0, sizeof(*addr));
213         switch (resource->type) {
214         case ACPI_RESOURCE_TYPE_MEMORY24:
215                 memory24 = &resource->data.memory24;
216                 addr->resource_type = ACPI_MEMORY_RANGE;
217                 addr->minimum = memory24->minimum;
218                 addr->address_length = memory24->address_length;
219                 addr->maximum = addr->minimum + addr->address_length - 1;
220                 return AE_OK;
221         case ACPI_RESOURCE_TYPE_MEMORY32:
222                 memory32 = &resource->data.memory32;
223                 addr->resource_type = ACPI_MEMORY_RANGE;
224                 addr->minimum = memory32->minimum;
225                 addr->address_length = memory32->address_length;
226                 addr->maximum = addr->minimum + addr->address_length - 1;
227                 return AE_OK;
228         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
229                 fixed_memory32 = &resource->data.fixed_memory32;
230                 addr->resource_type = ACPI_MEMORY_RANGE;
231                 addr->minimum = fixed_memory32->address;
232                 addr->address_length = fixed_memory32->address_length;
233                 addr->maximum = addr->minimum + addr->address_length - 1;
234                 return AE_OK;
235         case ACPI_RESOURCE_TYPE_ADDRESS16:
236         case ACPI_RESOURCE_TYPE_ADDRESS32:
237         case ACPI_RESOURCE_TYPE_ADDRESS64:
238                 status = acpi_resource_to_address64(resource, addr);
239                 if (ACPI_SUCCESS(status) &&
240                     (addr->resource_type == ACPI_MEMORY_RANGE ||
241                     addr->resource_type == ACPI_IO_RANGE) &&
242                     addr->address_length > 0) {
243                         return AE_OK;
244                 }
245                 break;
246         }
247         return AE_ERROR;
248 }
249
250 static acpi_status
251 count_resource(struct acpi_resource *acpi_res, void *data)
252 {
253         struct pci_root_info *info = data;
254         struct acpi_resource_address64 addr;
255         acpi_status status;
256
257         status = resource_to_addr(acpi_res, &addr);
258         if (ACPI_SUCCESS(status))
259                 info->res_num++;
260         return AE_OK;
261 }
262
263 static acpi_status
264 setup_resource(struct acpi_resource *acpi_res, void *data)
265 {
266         struct pci_root_info *info = data;
267         struct resource *res;
268         struct acpi_resource_address64 addr;
269         acpi_status status;
270         unsigned long flags;
271         u64 start, orig_end, end;
272
273         status = resource_to_addr(acpi_res, &addr);
274         if (!ACPI_SUCCESS(status))
275                 return AE_OK;
276
277         if (addr.resource_type == ACPI_MEMORY_RANGE) {
278                 flags = IORESOURCE_MEM;
279                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
280                         flags |= IORESOURCE_PREFETCH;
281         } else if (addr.resource_type == ACPI_IO_RANGE) {
282                 flags = IORESOURCE_IO;
283         } else
284                 return AE_OK;
285
286         start = addr.minimum + addr.translation_offset;
287         orig_end = end = addr.maximum + addr.translation_offset;
288
289         /* Exclude non-addressable range or non-addressable portion of range */
290         end = min(end, (u64)iomem_resource.end);
291         if (end <= start) {
292                 dev_info(&info->bridge->dev,
293                         "host bridge window [%#llx-%#llx] "
294                         "(ignored, not CPU addressable)\n", start, orig_end);
295                 return AE_OK;
296         } else if (orig_end != end) {
297                 dev_info(&info->bridge->dev,
298                         "host bridge window [%#llx-%#llx] "
299                         "([%#llx-%#llx] ignored, not CPU addressable)\n", 
300                         start, orig_end, end + 1, orig_end);
301         }
302
303         res = &info->res[info->res_num];
304         res->name = info->name;
305         res->flags = flags;
306         res->start = start;
307         res->end = end;
308
309         if (!pci_use_crs) {
310                 dev_printk(KERN_DEBUG, &info->bridge->dev,
311                            "host bridge window %pR (ignored)\n", res);
312                 return AE_OK;
313         }
314
315         info->res_num++;
316
317         return AE_OK;
318 }
319
320 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
321 {
322         int i, j;
323         struct resource *res1, *res2;
324
325         for (i = 0; i < info->res_num; i++) {
326                 res1 = &info->res[i];
327                 if (!(res1->flags & type))
328                         continue;
329
330                 for (j = i + 1; j < info->res_num; j++) {
331                         res2 = &info->res[j];
332                         if (!(res2->flags & type))
333                                 continue;
334
335                         /*
336                          * I don't like throwing away windows because then
337                          * our resources no longer match the ACPI _CRS, but
338                          * the kernel resource tree doesn't allow overlaps.
339                          */
340                         if (resource_overlaps(res1, res2)) {
341                                 res1->start = min(res1->start, res2->start);
342                                 res1->end = max(res1->end, res2->end);
343                                 dev_info(&info->bridge->dev,
344                                          "host bridge window expanded to %pR; %pR ignored\n",
345                                          res1, res2);
346                                 res2->flags = 0;
347                         }
348                 }
349         }
350 }
351
352 static void add_resources(struct pci_root_info *info,
353                           struct list_head *resources)
354 {
355         int i;
356         struct resource *res, *root, *conflict;
357
358         coalesce_windows(info, IORESOURCE_MEM);
359         coalesce_windows(info, IORESOURCE_IO);
360
361         for (i = 0; i < info->res_num; i++) {
362                 res = &info->res[i];
363
364                 if (res->flags & IORESOURCE_MEM)
365                         root = &iomem_resource;
366                 else if (res->flags & IORESOURCE_IO)
367                         root = &ioport_resource;
368                 else
369                         continue;
370
371                 conflict = insert_resource_conflict(root, res);
372                 if (conflict)
373                         dev_info(&info->bridge->dev,
374                                  "ignoring host bridge window %pR (conflicts with %s %pR)\n",
375                                  res, conflict->name, conflict);
376                 else
377                         pci_add_resource(resources, res);
378         }
379 }
380
381 static void free_pci_root_info_res(struct pci_root_info *info)
382 {
383         kfree(info->res);
384         info->res = NULL;
385         info->res_num = 0;
386 }
387
388 static void __release_pci_root_info(struct pci_root_info *info)
389 {
390         int i;
391         struct resource *res;
392
393         for (i = 0; i < info->res_num; i++) {
394                 res = &info->res[i];
395
396                 if (!res->parent)
397                         continue;
398
399                 if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
400                         continue;
401
402                 release_resource(res);
403         }
404
405         free_pci_root_info_res(info);
406
407         teardown_mcfg_map(info);
408
409         kfree(info);
410 }
411
412 static void release_pci_root_info(struct pci_host_bridge *bridge)
413 {
414         struct pci_root_info *info = bridge->release_data;
415
416         __release_pci_root_info(info);
417 }
418
419 static void
420 probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
421                     int busnum, int domain)
422 {
423         size_t size;
424
425         sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
426         info->bridge = device;
427
428         info->res_num = 0;
429         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
430                                 info);
431         if (!info->res_num)
432                 return;
433
434         size = sizeof(*info->res) * info->res_num;
435         info->res_num = 0;
436         info->res = kzalloc(size, GFP_KERNEL);
437         if (!info->res)
438                 return;
439
440         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
441                                 info);
442 }
443
444 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
445 {
446         struct acpi_device *device = root->device;
447         struct pci_root_info *info = NULL;
448         int domain = root->segment;
449         int busnum = root->secondary.start;
450         LIST_HEAD(resources);
451         struct pci_bus *bus = NULL;
452         struct pci_sysdata *sd;
453         int node;
454 #ifdef CONFIG_ACPI_NUMA
455         int pxm;
456 #endif
457
458         if (domain && !pci_domains_supported) {
459                 printk(KERN_WARNING "pci_bus %04x:%02x: "
460                        "ignored (multiple domains not supported)\n",
461                        domain, busnum);
462                 return NULL;
463         }
464
465         node = -1;
466 #ifdef CONFIG_ACPI_NUMA
467         pxm = acpi_get_pxm(device->handle);
468         if (pxm >= 0)
469                 node = pxm_to_node(pxm);
470         if (node != -1)
471                 set_mp_bus_to_node(busnum, node);
472         else
473 #endif
474                 node = get_mp_bus_to_node(busnum);
475
476         if (node != -1 && !node_online(node))
477                 node = -1;
478
479         info = kzalloc(sizeof(*info), GFP_KERNEL);
480         if (!info) {
481                 printk(KERN_WARNING "pci_bus %04x:%02x: "
482                        "ignored (out of memory)\n", domain, busnum);
483                 return NULL;
484         }
485
486         sd = &info->sd;
487         sd->domain = domain;
488         sd->node = node;
489         /*
490          * Maybe the desired pci bus has been already scanned. In such case
491          * it is unnecessary to scan the pci bus with the given domain,busnum.
492          */
493         bus = pci_find_bus(domain, busnum);
494         if (bus) {
495                 /*
496                  * If the desired bus exits, the content of bus->sysdata will
497                  * be replaced by sd.
498                  */
499                 memcpy(bus->sysdata, sd, sizeof(*sd));
500                 kfree(info);
501         } else {
502                 probe_pci_root_info(info, device, busnum, domain);
503
504                 /* insert busn res at first */
505                 pci_add_resource(&resources,  &root->secondary);
506                 /*
507                  * _CRS with no apertures is normal, so only fall back to
508                  * defaults or native bridge info if we're ignoring _CRS.
509                  */
510                 if (pci_use_crs)
511                         add_resources(info, &resources);
512                 else {
513                         free_pci_root_info_res(info);
514                         x86_pci_root_bus_resources(busnum, &resources);
515                 }
516
517                 if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
518                                     (u8)root->secondary.end, root->mcfg_addr))
519                         bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
520                                                   sd, &resources);
521
522                 if (bus) {
523                         pci_scan_child_bus(bus);
524                         pci_set_host_bridge_release(
525                                 to_pci_host_bridge(bus->bridge),
526                                 release_pci_root_info, info);
527                 } else {
528                         pci_free_resource_list(&resources);
529                         __release_pci_root_info(info);
530                 }
531         }
532
533         /* After the PCI-E bus has been walked and all devices discovered,
534          * configure any settings of the fabric that might be necessary.
535          */
536         if (bus) {
537                 struct pci_bus *child;
538                 list_for_each_entry(child, &bus->children, node) {
539                         struct pci_dev *self = child->self;
540                         if (!self)
541                                 continue;
542
543                         pcie_bus_configure_settings(child, self->pcie_mpss);
544                 }
545         }
546
547         if (bus && node != -1) {
548 #ifdef CONFIG_ACPI_NUMA
549                 if (pxm >= 0)
550                         dev_printk(KERN_DEBUG, &bus->dev,
551                                    "on NUMA node %d (pxm %d)\n", node, pxm);
552 #else
553                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
554 #endif
555         }
556
557         return bus;
558 }
559
560 int __init pci_acpi_init(void)
561 {
562         struct pci_dev *dev = NULL;
563
564         if (acpi_noirq)
565                 return -ENODEV;
566
567         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
568         acpi_irq_penalty_init();
569         pcibios_enable_irq = acpi_pci_irq_enable;
570         pcibios_disable_irq = acpi_pci_irq_disable;
571         x86_init.pci.init_irq = x86_init_noop;
572
573         if (pci_routeirq) {
574                 /*
575                  * PCI IRQ routing is set up by pci_enable_device(), but we
576                  * also do it here in case there are still broken drivers that
577                  * don't use pci_enable_device().
578                  */
579                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
580                 for_each_pci_dev(dev)
581                         acpi_pci_irq_enable(dev);
582         }
583
584         return 0;
585 }