c6fd3a6afa4268b5aca819561365723e67902d7c
[linux-3.10.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 <asm/numa.h>
7 #include "pci.h"
8
9 static int __devinit can_skip_ioresource_align(struct dmi_system_id *d)
10 {
11         pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
12         printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);
13         return 0;
14 }
15
16 static struct dmi_system_id acpi_pciprobe_dmi_table[] = {
17 /*
18  * Systems where PCI IO resource ISA alignment can be skipped
19  * when the ISA enable bit in the bridge control is not set
20  */
21         {
22                 .callback = can_skip_ioresource_align,
23                 .ident = "IBM System x3800",
24                 .matches = {
25                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
26                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
27                 },
28         },
29         {
30                 .callback = can_skip_ioresource_align,
31                 .ident = "IBM System x3850",
32                 .matches = {
33                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
34                         DMI_MATCH(DMI_PRODUCT_NAME, "x3850"),
35                 },
36         },
37         {
38                 .callback = can_skip_ioresource_align,
39                 .ident = "IBM System x3950",
40                 .matches = {
41                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
42                         DMI_MATCH(DMI_PRODUCT_NAME, "x3950"),
43                 },
44         },
45         {}
46 };
47
48 struct pci_root_info {
49         char *name;
50         unsigned int res_num;
51         struct resource *res;
52         struct pci_bus *bus;
53         int busnum;
54 };
55
56 static acpi_status
57 resource_to_addr(struct acpi_resource *resource,
58                         struct acpi_resource_address64 *addr)
59 {
60         acpi_status status;
61
62         status = acpi_resource_to_address64(resource, addr);
63         if (ACPI_SUCCESS(status) &&
64             (addr->resource_type == ACPI_MEMORY_RANGE ||
65             addr->resource_type == ACPI_IO_RANGE) &&
66             addr->address_length > 0 &&
67             addr->producer_consumer == ACPI_PRODUCER) {
68                 return AE_OK;
69         }
70         return AE_ERROR;
71 }
72
73 static acpi_status
74 count_resource(struct acpi_resource *acpi_res, void *data)
75 {
76         struct pci_root_info *info = data;
77         struct acpi_resource_address64 addr;
78         acpi_status status;
79
80         status = resource_to_addr(acpi_res, &addr);
81         if (ACPI_SUCCESS(status))
82                 info->res_num++;
83         return AE_OK;
84 }
85
86 static acpi_status
87 setup_resource(struct acpi_resource *acpi_res, void *data)
88 {
89         struct pci_root_info *info = data;
90         struct resource *res;
91         struct acpi_resource_address64 addr;
92         acpi_status status;
93         unsigned long flags;
94         struct resource *root;
95
96         status = resource_to_addr(acpi_res, &addr);
97         if (!ACPI_SUCCESS(status))
98                 return AE_OK;
99
100         if (addr.resource_type == ACPI_MEMORY_RANGE) {
101                 root = &iomem_resource;
102                 flags = IORESOURCE_MEM;
103                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
104                         flags |= IORESOURCE_PREFETCH;
105         } else if (addr.resource_type == ACPI_IO_RANGE) {
106                 root = &ioport_resource;
107                 flags = IORESOURCE_IO;
108         } else
109                 return AE_OK;
110
111         res = &info->res[info->res_num];
112         res->name = info->name;
113         res->flags = flags;
114         res->start = addr.minimum + addr.translation_offset;
115         res->end = res->start + addr.address_length - 1;
116         res->child = NULL;
117
118         if (insert_resource(root, res)) {
119                 printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
120                         "from %s for %s\n", (unsigned long) res->start,
121                         (unsigned long) res->end, root->name, info->name);
122         } else {
123                 info->bus->resource[info->res_num] = res;
124                 info->res_num++;
125         }
126         return AE_OK;
127 }
128
129 static void
130 adjust_transparent_bridge_resources(struct pci_bus *bus)
131 {
132         struct pci_dev *dev;
133
134         list_for_each_entry(dev, &bus->devices, bus_list) {
135                 int i;
136                 u16 class = dev->class >> 8;
137
138                 if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent) {
139                         for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
140                                 dev->subordinate->resource[i] =
141                                                 dev->bus->resource[i - 3];
142                 }
143         }
144 }
145
146 static void
147 get_current_resources(struct acpi_device *device, int busnum,
148                         struct pci_bus *bus)
149 {
150         struct pci_root_info info;
151         size_t size;
152
153         info.bus = bus;
154         info.res_num = 0;
155         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
156                                 &info);
157         if (!info.res_num)
158                 return;
159
160         size = sizeof(*info.res) * info.res_num;
161         info.res = kmalloc(size, GFP_KERNEL);
162         if (!info.res)
163                 goto res_alloc_fail;
164
165         info.name = kmalloc(12, GFP_KERNEL);
166         if (!info.name)
167                 goto name_alloc_fail;
168         sprintf(info.name, "PCI Bus #%02x", busnum);
169
170         info.res_num = 0;
171         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
172                                 &info);
173         if (info.res_num)
174                 adjust_transparent_bridge_resources(bus);
175
176         return;
177
178 name_alloc_fail:
179         kfree(info.res);
180 res_alloc_fail:
181         return;
182 }
183
184 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
185 {
186         struct pci_bus *bus;
187         struct pci_sysdata *sd;
188         int pxm;
189
190         dmi_check_system(acpi_pciprobe_dmi_table);
191
192         /* Allocate per-root-bus (not per bus) arch-specific data.
193          * TODO: leak; this memory is never freed.
194          * It's arguable whether it's worth the trouble to care.
195          */
196         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
197         if (!sd) {
198                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
199                 return NULL;
200         }
201
202         if (domain != 0) {
203                 printk(KERN_WARNING "PCI: Multiple domains not supported\n");
204                 kfree(sd);
205                 return NULL;
206         }
207
208         sd->node = -1;
209
210         pxm = acpi_get_pxm(device->handle);
211 #ifdef CONFIG_ACPI_NUMA
212         if (pxm >= 0)
213                 sd->node = pxm_to_node(pxm);
214 #endif
215
216         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
217         if (!bus)
218                 kfree(sd);
219
220 #ifdef CONFIG_ACPI_NUMA
221         if (bus != NULL) {
222                 if (pxm >= 0) {
223                         printk("bus %d -> pxm %d -> node %d\n",
224                                 busnum, pxm, sd->node);
225                 }
226         }
227 #endif
228
229         if (bus && (pci_probe & PCI_USE__CRS))
230                 get_current_resources(device, busnum, bus);
231         
232         return bus;
233 }
234
235 extern int pci_routeirq;
236 static int __init pci_acpi_init(void)
237 {
238         struct pci_dev *dev = NULL;
239
240         if (pcibios_scanned)
241                 return 0;
242
243         if (acpi_noirq)
244                 return 0;
245
246         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
247         acpi_irq_penalty_init();
248         pcibios_scanned++;
249         pcibios_enable_irq = acpi_pci_irq_enable;
250         pcibios_disable_irq = acpi_pci_irq_disable;
251
252         if (pci_routeirq) {
253                 /*
254                  * PCI IRQ routing is set up by pci_enable_device(), but we
255                  * also do it here in case there are still broken drivers that
256                  * don't use pci_enable_device().
257                  */
258                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
259                 for_each_pci_dev(dev)
260                         acpi_pci_irq_enable(dev);
261         } else
262                 printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
263
264 #ifdef CONFIG_X86_IO_APIC
265         if (acpi_ioapic)
266                 print_IO_APIC();
267 #endif
268
269         return 0;
270 }
271 subsys_initcall(pci_acpi_init);