0234f2831bf371194f69779753ce2fb017570984
[sfrench/cifs-2.6.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(const 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[] __devinitdata = {
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         if (info->res_num >= PCI_BUS_NUM_RESOURCES)
81                 return AE_OK;
82
83         status = resource_to_addr(acpi_res, &addr);
84         if (ACPI_SUCCESS(status))
85                 info->res_num++;
86         return AE_OK;
87 }
88
89 static acpi_status
90 setup_resource(struct acpi_resource *acpi_res, void *data)
91 {
92         struct pci_root_info *info = data;
93         struct resource *res;
94         struct acpi_resource_address64 addr;
95         acpi_status status;
96         unsigned long flags;
97         struct resource *root;
98
99         if (info->res_num >= PCI_BUS_NUM_RESOURCES)
100                 return AE_OK;
101
102         status = resource_to_addr(acpi_res, &addr);
103         if (!ACPI_SUCCESS(status))
104                 return AE_OK;
105
106         if (addr.resource_type == ACPI_MEMORY_RANGE) {
107                 root = &iomem_resource;
108                 flags = IORESOURCE_MEM;
109                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
110                         flags |= IORESOURCE_PREFETCH;
111         } else if (addr.resource_type == ACPI_IO_RANGE) {
112                 root = &ioport_resource;
113                 flags = IORESOURCE_IO;
114         } else
115                 return AE_OK;
116
117         res = &info->res[info->res_num];
118         res->name = info->name;
119         res->flags = flags;
120         res->start = addr.minimum + addr.translation_offset;
121         res->end = res->start + addr.address_length - 1;
122         res->child = NULL;
123
124         if (insert_resource(root, res)) {
125                 printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
126                         "from %s for %s\n", (unsigned long) res->start,
127                         (unsigned long) res->end, root->name, info->name);
128         } else {
129                 info->bus->resource[info->res_num] = res;
130                 info->res_num++;
131         }
132         return AE_OK;
133 }
134
135 static void
136 adjust_transparent_bridge_resources(struct pci_bus *bus)
137 {
138         struct pci_dev *dev;
139
140         list_for_each_entry(dev, &bus->devices, bus_list) {
141                 int i;
142                 u16 class = dev->class >> 8;
143
144                 if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent) {
145                         for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
146                                 dev->subordinate->resource[i] =
147                                                 dev->bus->resource[i - 3];
148                 }
149         }
150 }
151
152 static void
153 get_current_resources(struct acpi_device *device, int busnum,
154                         struct pci_bus *bus)
155 {
156         struct pci_root_info info;
157         size_t size;
158
159         info.bus = bus;
160         info.res_num = 0;
161         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
162                                 &info);
163         if (!info.res_num)
164                 return;
165
166         size = sizeof(*info.res) * info.res_num;
167         info.res = kmalloc(size, GFP_KERNEL);
168         if (!info.res)
169                 goto res_alloc_fail;
170
171         info.name = kmalloc(12, GFP_KERNEL);
172         if (!info.name)
173                 goto name_alloc_fail;
174         sprintf(info.name, "PCI Bus #%02x", busnum);
175
176         info.res_num = 0;
177         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
178                                 &info);
179         if (info.res_num)
180                 adjust_transparent_bridge_resources(bus);
181
182         return;
183
184 name_alloc_fail:
185         kfree(info.res);
186 res_alloc_fail:
187         return;
188 }
189
190 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
191 {
192         struct pci_bus *bus;
193         struct pci_sysdata *sd;
194         int pxm;
195
196         dmi_check_system(acpi_pciprobe_dmi_table);
197
198         if (domain && !pci_domains_supported) {
199                 printk(KERN_WARNING "PCI: Multiple domains not supported "
200                        "(dom %d, bus %d)\n", domain, busnum);
201                 return NULL;
202         }
203
204         /* Allocate per-root-bus (not per bus) arch-specific data.
205          * TODO: leak; this memory is never freed.
206          * It's arguable whether it's worth the trouble to care.
207          */
208         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
209         if (!sd) {
210                 printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
211                 return NULL;
212         }
213
214         sd->domain = domain;
215         sd->node = -1;
216
217         pxm = acpi_get_pxm(device->handle);
218 #ifdef CONFIG_ACPI_NUMA
219         if (pxm >= 0)
220                 sd->node = pxm_to_node(pxm);
221 #endif
222
223         bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
224         if (!bus)
225                 kfree(sd);
226
227 #ifdef CONFIG_ACPI_NUMA
228         if (bus != NULL) {
229                 if (pxm >= 0) {
230                         printk("bus %d -> pxm %d -> node %d\n",
231                                 busnum, pxm, sd->node);
232                 }
233         }
234 #endif
235
236         if (bus && (pci_probe & PCI_USE__CRS))
237                 get_current_resources(device, busnum, bus);
238         
239         return bus;
240 }
241
242 extern int pci_routeirq;
243 static int __init pci_acpi_init(void)
244 {
245         struct pci_dev *dev = NULL;
246
247         if (pcibios_scanned)
248                 return 0;
249
250         if (acpi_noirq)
251                 return 0;
252
253         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
254         acpi_irq_penalty_init();
255         pcibios_scanned++;
256         pcibios_enable_irq = acpi_pci_irq_enable;
257         pcibios_disable_irq = acpi_pci_irq_disable;
258
259         if (pci_routeirq) {
260                 /*
261                  * PCI IRQ routing is set up by pci_enable_device(), but we
262                  * also do it here in case there are still broken drivers that
263                  * don't use pci_enable_device().
264                  */
265                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
266                 for_each_pci_dev(dev)
267                         acpi_pci_irq_enable(dev);
268         } else
269                 printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\".  If it helps, post a report\n");
270
271 #ifdef CONFIG_X86_IO_APIC
272         if (acpi_ioapic)
273                 print_IO_APIC();
274 #endif
275
276         return 0;
277 }
278 subsys_initcall(pci_acpi_init);