2 #include <linux/acpi.h>
3 #include <linux/init.h>
6 #include <linux/slab.h>
8 #include <asm/pci_x86.h>
10 struct pci_root_info {
11 struct acpi_device *bridge;
15 resource_size_t *res_offset;
16 struct pci_sysdata sd;
17 #ifdef CONFIG_PCI_MMCONFIG
25 static bool pci_use_crs = true;
26 static bool pci_ignore_seg = false;
28 static int __init set_use_crs(const struct dmi_system_id *id)
34 static int __init set_nouse_crs(const struct dmi_system_id *id)
40 static int __init set_ignore_seg(const struct dmi_system_id *id)
42 printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
43 pci_ignore_seg = true;
47 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
48 /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
50 .callback = set_use_crs,
51 .ident = "IBM System x3800",
53 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
54 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
57 /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
58 /* 2006 AMD HT/VIA system with two host bridges */
60 .callback = set_use_crs,
61 .ident = "ASRock ALiveSATA2-GLAN",
63 DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
66 /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
67 /* 2006 AMD HT/VIA system with two host bridges */
69 .callback = set_use_crs,
70 .ident = "ASUS M2V-MX SE",
72 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
73 DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
74 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
77 /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
79 .callback = set_use_crs,
80 .ident = "MSI MS-7253",
82 DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
83 DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
84 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
88 /* Now for the blacklist.. */
90 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
92 .callback = set_nouse_crs,
93 .ident = "Dell Studio 1557",
95 DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
96 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
97 DMI_MATCH(DMI_BIOS_VERSION, "A09"),
100 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
102 .callback = set_nouse_crs,
103 .ident = "Thinkpad SL510",
105 DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
106 DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
107 DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
111 /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
113 .callback = set_ignore_seg,
114 .ident = "HP xw9300",
116 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
117 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
123 void __init pci_acpi_crs_quirks(void)
127 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
130 dmi_check_system(pci_crs_quirks);
133 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
134 * takes precedence over anything we figured out above.
136 if (pci_probe & PCI_ROOT_NO_CRS)
138 else if (pci_probe & PCI_USE__CRS)
141 printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
142 "if necessary, use \"pci=%s\" and report a bug\n",
143 pci_use_crs ? "Using" : "Ignoring",
144 pci_use_crs ? "nocrs" : "use_crs");
147 #ifdef CONFIG_PCI_MMCONFIG
148 static int check_segment(u16 seg, struct device *dev, char *estr)
152 "%s can't access PCI configuration "
153 "space under this host bridge.\n",
159 * Failure in adding MMCFG information is not fatal,
160 * just can't access extended configuration space of
161 * devices under this host bridge.
164 "%s can't access extended PCI configuration "
165 "space under this bridge.\n",
171 static int setup_mcfg_map(struct pci_root_info *info, u16 seg, u8 start,
172 u8 end, phys_addr_t addr)
175 struct device *dev = &info->bridge->dev;
177 info->start_bus = start;
179 info->mcfg_added = false;
181 /* return success if MMCFG is not in use */
182 if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
185 if (!(pci_probe & PCI_PROBE_MMCONF))
186 return check_segment(seg, dev, "MMCONFIG is disabled,");
188 result = pci_mmconfig_insert(dev, seg, start, end, addr);
190 /* enable MMCFG if it hasn't been enabled yet */
191 if (raw_pci_ext_ops == NULL)
192 raw_pci_ext_ops = &pci_mmcfg;
193 info->mcfg_added = true;
194 } else if (result != -EEXIST)
195 return check_segment(seg, dev,
196 "fail to add MMCONFIG information,");
201 static void teardown_mcfg_map(struct pci_root_info *info)
203 if (info->mcfg_added) {
204 pci_mmconfig_delete(info->segment, info->start_bus,
206 info->mcfg_added = false;
210 static int setup_mcfg_map(struct pci_root_info *info,
211 u16 seg, u8 start, u8 end,
216 static void teardown_mcfg_map(struct pci_root_info *info)
221 static acpi_status resource_to_addr(struct acpi_resource *resource,
222 struct acpi_resource_address64 *addr)
225 struct acpi_resource_memory24 *memory24;
226 struct acpi_resource_memory32 *memory32;
227 struct acpi_resource_fixed_memory32 *fixed_memory32;
229 memset(addr, 0, sizeof(*addr));
230 switch (resource->type) {
231 case ACPI_RESOURCE_TYPE_MEMORY24:
232 memory24 = &resource->data.memory24;
233 addr->resource_type = ACPI_MEMORY_RANGE;
234 addr->minimum = memory24->minimum;
235 addr->address_length = memory24->address_length;
236 addr->maximum = addr->minimum + addr->address_length - 1;
238 case ACPI_RESOURCE_TYPE_MEMORY32:
239 memory32 = &resource->data.memory32;
240 addr->resource_type = ACPI_MEMORY_RANGE;
241 addr->minimum = memory32->minimum;
242 addr->address_length = memory32->address_length;
243 addr->maximum = addr->minimum + addr->address_length - 1;
245 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
246 fixed_memory32 = &resource->data.fixed_memory32;
247 addr->resource_type = ACPI_MEMORY_RANGE;
248 addr->minimum = fixed_memory32->address;
249 addr->address_length = fixed_memory32->address_length;
250 addr->maximum = addr->minimum + addr->address_length - 1;
252 case ACPI_RESOURCE_TYPE_ADDRESS16:
253 case ACPI_RESOURCE_TYPE_ADDRESS32:
254 case ACPI_RESOURCE_TYPE_ADDRESS64:
255 status = acpi_resource_to_address64(resource, addr);
256 if (ACPI_SUCCESS(status) &&
257 (addr->resource_type == ACPI_MEMORY_RANGE ||
258 addr->resource_type == ACPI_IO_RANGE) &&
259 addr->address_length > 0) {
267 static acpi_status count_resource(struct acpi_resource *acpi_res, void *data)
269 struct pci_root_info *info = data;
270 struct acpi_resource_address64 addr;
273 status = resource_to_addr(acpi_res, &addr);
274 if (ACPI_SUCCESS(status))
279 static acpi_status setup_resource(struct acpi_resource *acpi_res, void *data)
281 struct pci_root_info *info = data;
282 struct resource *res;
283 struct acpi_resource_address64 addr;
286 u64 start, orig_end, end;
288 status = resource_to_addr(acpi_res, &addr);
289 if (!ACPI_SUCCESS(status))
292 if (addr.resource_type == ACPI_MEMORY_RANGE) {
293 flags = IORESOURCE_MEM;
294 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
295 flags |= IORESOURCE_PREFETCH;
296 } else if (addr.resource_type == ACPI_IO_RANGE) {
297 flags = IORESOURCE_IO;
301 start = addr.minimum + addr.translation_offset;
302 orig_end = end = addr.maximum + addr.translation_offset;
304 /* Exclude non-addressable range or non-addressable portion of range */
305 end = min(end, (u64)iomem_resource.end);
307 dev_info(&info->bridge->dev,
308 "host bridge window [%#llx-%#llx] "
309 "(ignored, not CPU addressable)\n", start, orig_end);
311 } else if (orig_end != end) {
312 dev_info(&info->bridge->dev,
313 "host bridge window [%#llx-%#llx] "
314 "([%#llx-%#llx] ignored, not CPU addressable)\n",
315 start, orig_end, end + 1, orig_end);
318 res = &info->res[info->res_num];
319 res->name = info->name;
323 info->res_offset[info->res_num] = addr.translation_offset;
327 dev_printk(KERN_DEBUG, &info->bridge->dev,
328 "host bridge window %pR (ignored)\n", res);
333 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
336 struct resource *res1, *res2;
338 for (i = 0; i < info->res_num; i++) {
339 res1 = &info->res[i];
340 if (!(res1->flags & type))
343 for (j = i + 1; j < info->res_num; j++) {
344 res2 = &info->res[j];
345 if (!(res2->flags & type))
349 * I don't like throwing away windows because then
350 * our resources no longer match the ACPI _CRS, but
351 * the kernel resource tree doesn't allow overlaps.
353 if (resource_overlaps(res1, res2)) {
354 res2->start = min(res1->start, res2->start);
355 res2->end = max(res1->end, res2->end);
356 dev_info(&info->bridge->dev,
357 "host bridge window expanded to %pR; %pR ignored\n",
365 static void add_resources(struct pci_root_info *info,
366 struct list_head *resources)
369 struct resource *res, *root, *conflict;
371 coalesce_windows(info, IORESOURCE_MEM);
372 coalesce_windows(info, IORESOURCE_IO);
374 for (i = 0; i < info->res_num; i++) {
377 if (res->flags & IORESOURCE_MEM)
378 root = &iomem_resource;
379 else if (res->flags & IORESOURCE_IO)
380 root = &ioport_resource;
384 conflict = insert_resource_conflict(root, res);
386 dev_info(&info->bridge->dev,
387 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
388 res, conflict->name, conflict);
390 pci_add_resource_offset(resources, res,
391 info->res_offset[i]);
395 static void free_pci_root_info_res(struct pci_root_info *info)
399 kfree(info->res_offset);
400 info->res_offset = NULL;
404 static void __release_pci_root_info(struct pci_root_info *info)
407 struct resource *res;
409 for (i = 0; i < info->res_num; i++) {
415 if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
418 release_resource(res);
421 free_pci_root_info_res(info);
423 teardown_mcfg_map(info);
428 static void release_pci_root_info(struct pci_host_bridge *bridge)
430 struct pci_root_info *info = bridge->release_data;
432 __release_pci_root_info(info);
435 static void probe_pci_root_info(struct pci_root_info *info,
436 struct acpi_device *device,
437 int busnum, int domain)
441 sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
442 info->bridge = device;
445 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
450 size = sizeof(*info->res) * info->res_num;
451 info->res = kzalloc_node(size, GFP_KERNEL, info->sd.node);
457 size = sizeof(*info->res_offset) * info->res_num;
459 info->res_offset = kzalloc_node(size, GFP_KERNEL, info->sd.node);
460 if (!info->res_offset) {
466 acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
470 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
472 struct acpi_device *device = root->device;
473 struct pci_root_info *info;
474 int domain = root->segment;
475 int busnum = root->secondary.start;
476 LIST_HEAD(resources);
478 struct pci_sysdata *sd;
484 if (domain && !pci_domains_supported) {
485 printk(KERN_WARNING "pci_bus %04x:%02x: "
486 "ignored (multiple domains not supported)\n",
491 node = acpi_get_node(device->handle);
492 if (node == NUMA_NO_NODE) {
493 node = x86_pci_root_bus_node(busnum);
494 if (node != 0 && node != NUMA_NO_NODE)
495 dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
499 if (node != NUMA_NO_NODE && !node_online(node))
502 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
504 printk(KERN_WARNING "pci_bus %04x:%02x: "
505 "ignored (out of memory)\n", domain, busnum);
512 sd->companion = device;
514 bus = pci_find_bus(domain, busnum);
517 * If the desired bus has been scanned already, replace
520 memcpy(bus->sysdata, sd, sizeof(*sd));
523 probe_pci_root_info(info, device, busnum, domain);
525 /* insert busn res at first */
526 pci_add_resource(&resources, &root->secondary);
528 * _CRS with no apertures is normal, so only fall back to
529 * defaults or native bridge info if we're ignoring _CRS.
532 add_resources(info, &resources);
534 free_pci_root_info_res(info);
535 x86_pci_root_bus_resources(busnum, &resources);
538 if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
539 (u8)root->secondary.end, root->mcfg_addr))
540 bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
544 pci_scan_child_bus(bus);
545 pci_set_host_bridge_release(
546 to_pci_host_bridge(bus->bridge),
547 release_pci_root_info, info);
549 pci_free_resource_list(&resources);
550 __release_pci_root_info(info);
554 /* After the PCI-E bus has been walked and all devices discovered,
555 * configure any settings of the fabric that might be necessary.
558 struct pci_bus *child;
559 list_for_each_entry(child, &bus->children, node)
560 pcie_bus_configure_settings(child);
563 if (bus && node != NUMA_NO_NODE)
564 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
569 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
571 struct pci_sysdata *sd = bridge->bus->sysdata;
573 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
577 int __init pci_acpi_init(void)
579 struct pci_dev *dev = NULL;
584 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
585 acpi_irq_penalty_init();
586 pcibios_enable_irq = acpi_pci_irq_enable;
587 pcibios_disable_irq = acpi_pci_irq_disable;
588 x86_init.pci.init_irq = x86_init_noop;
592 * PCI IRQ routing is set up by pci_enable_device(), but we
593 * also do it here in case there are still broken drivers that
594 * don't use pci_enable_device().
596 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
597 for_each_pci_dev(dev)
598 acpi_pci_irq_enable(dev);