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;
19 static bool pci_use_crs = true;
21 static int __init set_use_crs(const struct dmi_system_id *id)
27 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
28 /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
30 .callback = set_use_crs,
31 .ident = "IBM System x3800",
33 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
34 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
37 /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
38 /* 2006 AMD HT/VIA system with two host bridges */
40 .callback = set_use_crs,
41 .ident = "ASRock ALiveSATA2-GLAN",
43 DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
46 /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
47 /* 2006 AMD HT/VIA system with two host bridges */
49 .callback = set_use_crs,
50 .ident = "ASUS M2V-MX SE",
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."),
60 void __init pci_acpi_crs_quirks(void)
64 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
67 dmi_check_system(pci_use_crs_table);
70 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
71 * takes precedence over anything we figured out above.
73 if (pci_probe & PCI_ROOT_NO_CRS)
75 else if (pci_probe & PCI_USE__CRS)
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");
85 resource_to_addr(struct acpi_resource *resource,
86 struct acpi_resource_address64 *addr)
89 struct acpi_resource_memory24 *memory24;
90 struct acpi_resource_memory32 *memory32;
91 struct acpi_resource_fixed_memory32 *fixed_memory32;
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;
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;
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;
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) {
132 count_resource(struct acpi_resource *acpi_res, void *data)
134 struct pci_root_info *info = data;
135 struct acpi_resource_address64 addr;
138 status = resource_to_addr(acpi_res, &addr);
139 if (ACPI_SUCCESS(status))
145 setup_resource(struct acpi_resource *acpi_res, void *data)
147 struct pci_root_info *info = data;
148 struct resource *res;
149 struct acpi_resource_address64 addr;
154 status = resource_to_addr(acpi_res, &addr);
155 if (!ACPI_SUCCESS(status))
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;
167 start = addr.minimum + addr.translation_offset;
168 end = addr.maximum + addr.translation_offset;
170 res = &info->res[info->res_num];
171 res->name = info->name;
178 dev_printk(KERN_DEBUG, &info->bridge->dev,
179 "host bridge window %pR (ignored)\n", res);
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);
190 dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
195 static bool resource_contains(struct resource *res, resource_size_t point)
197 if (res->start <= point && point <= res->end)
202 static void coalesce_windows(struct pci_root_info *info, unsigned long type)
205 struct resource *res1, *res2;
207 for (i = 0; i < info->res_num; i++) {
208 res1 = &info->res[i];
209 if (!(res1->flags & type))
212 for (j = i + 1; j < info->res_num; j++) {
213 res2 = &info->res[j];
214 if (!(res2->flags & type))
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.
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",
237 static void add_resources(struct pci_root_info *info)
240 struct resource *res, *root, *conflict;
245 coalesce_windows(info, IORESOURCE_MEM);
246 coalesce_windows(info, IORESOURCE_IO);
248 for (i = 0; i < info->res_num; i++) {
251 if (res->flags & IORESOURCE_MEM)
252 root = &iomem_resource;
253 else if (res->flags & IORESOURCE_IO)
254 root = &ioport_resource;
258 conflict = insert_resource_conflict(root, res);
260 dev_info(&info->bridge->dev,
261 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
262 res, conflict->name, conflict);
264 pci_bus_add_resource(info->bus, res, 0);
269 get_current_resources(struct acpi_device *device, int busnum,
270 int domain, struct pci_bus *bus)
272 struct pci_root_info info;
276 pci_bus_remove_resources(bus);
278 info.bridge = device;
281 acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
286 size = sizeof(*info.res) * info.res_num;
287 info.res = kmalloc(size, GFP_KERNEL);
291 info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
293 goto name_alloc_fail;
296 acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
299 add_resources(&info);
308 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
310 struct acpi_device *device = root->device;
311 int domain = root->segment;
312 int busnum = root->secondary.start;
314 struct pci_sysdata *sd;
316 #ifdef CONFIG_ACPI_NUMA
320 if (domain && !pci_domains_supported) {
321 printk(KERN_WARNING "pci_bus %04x:%02x: "
322 "ignored (multiple domains not supported)\n",
328 #ifdef CONFIG_ACPI_NUMA
329 pxm = acpi_get_pxm(device->handle);
331 node = pxm_to_node(pxm);
333 set_mp_bus_to_node(busnum, node);
336 node = get_mp_bus_to_node(busnum);
338 if (node != -1 && !node_online(node))
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.
345 sd = kzalloc(sizeof(*sd), GFP_KERNEL);
347 printk(KERN_WARNING "pci_bus %04x:%02x: "
348 "ignored (out of memory)\n", domain, busnum);
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.
358 bus = pci_find_bus(domain, busnum);
361 * If the desired bus exits, the content of bus->sysdata will
364 memcpy(bus->sysdata, sd, sizeof(*sd));
367 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
369 get_current_resources(device, busnum, domain, bus);
370 bus->subordinate = pci_scan_child_bus(bus);
374 /* After the PCI-E bus has been walked and all devices discovered,
375 * configure any settings of the fabric that might be necessary.
378 struct pci_bus *child;
379 list_for_each_entry(child, &bus->children, node) {
380 struct pci_dev *self = child->self;
384 pcie_bus_configure_settings(child, self->pcie_mpss);
391 if (bus && node != -1) {
392 #ifdef CONFIG_ACPI_NUMA
394 dev_printk(KERN_DEBUG, &bus->dev,
395 "on NUMA node %d (pxm %d)\n", node, pxm);
397 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
404 int __init pci_acpi_init(void)
406 struct pci_dev *dev = NULL;
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;
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().
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);