x86/PCI: compute Address Space length rather than using _LEN
[linux-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 <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;
13         unsigned int res_num;
14         struct resource *res;
15         struct pci_bus *bus;
16         int busnum;
17 };
18
19 static bool pci_use_crs = true;
20
21 static int __init set_use_crs(const struct dmi_system_id *id)
22 {
23         pci_use_crs = true;
24         return 0;
25 }
26
27 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
28         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
29         {
30                 .callback = set_use_crs,
31                 .ident = "IBM System x3800",
32                 .matches = {
33                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
34                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
35                 },
36         },
37         {}
38 };
39
40 void __init pci_acpi_crs_quirks(void)
41 {
42         int year;
43
44         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
45                 pci_use_crs = false;
46
47         dmi_check_system(pci_use_crs_table);
48
49         /*
50          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
51          * takes precedence over anything we figured out above.
52          */
53         if (pci_probe & PCI_ROOT_NO_CRS)
54                 pci_use_crs = false;
55         else if (pci_probe & PCI_USE__CRS)
56                 pci_use_crs = true;
57
58         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
59                "if necessary, use \"pci=%s\" and report a bug\n",
60                pci_use_crs ? "Using" : "Ignoring",
61                pci_use_crs ? "nocrs" : "use_crs");
62 }
63
64 static acpi_status
65 resource_to_addr(struct acpi_resource *resource,
66                         struct acpi_resource_address64 *addr)
67 {
68         acpi_status status;
69         struct acpi_resource_memory24 *memory24;
70         struct acpi_resource_memory32 *memory32;
71         struct acpi_resource_fixed_memory32 *fixed_memory32;
72
73         memset(addr, 0, sizeof(*addr));
74         switch (resource->type) {
75         case ACPI_RESOURCE_TYPE_MEMORY24:
76                 memory24 = &resource->data.memory24;
77                 addr->resource_type = ACPI_MEMORY_RANGE;
78                 addr->minimum = memory24->minimum;
79                 addr->address_length = memory24->address_length;
80                 addr->maximum = addr->minimum + addr->address_length - 1;
81                 return AE_OK;
82         case ACPI_RESOURCE_TYPE_MEMORY32:
83                 memory32 = &resource->data.memory32;
84                 addr->resource_type = ACPI_MEMORY_RANGE;
85                 addr->minimum = memory32->minimum;
86                 addr->address_length = memory32->address_length;
87                 addr->maximum = addr->minimum + addr->address_length - 1;
88                 return AE_OK;
89         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
90                 fixed_memory32 = &resource->data.fixed_memory32;
91                 addr->resource_type = ACPI_MEMORY_RANGE;
92                 addr->minimum = fixed_memory32->address;
93                 addr->address_length = fixed_memory32->address_length;
94                 addr->maximum = addr->minimum + addr->address_length - 1;
95                 return AE_OK;
96         case ACPI_RESOURCE_TYPE_ADDRESS16:
97         case ACPI_RESOURCE_TYPE_ADDRESS32:
98         case ACPI_RESOURCE_TYPE_ADDRESS64:
99                 status = acpi_resource_to_address64(resource, addr);
100                 if (ACPI_SUCCESS(status) &&
101                     (addr->resource_type == ACPI_MEMORY_RANGE ||
102                     addr->resource_type == ACPI_IO_RANGE) &&
103                     addr->address_length > 0) {
104                         return AE_OK;
105                 }
106                 break;
107         }
108         return AE_ERROR;
109 }
110
111 static acpi_status
112 count_resource(struct acpi_resource *acpi_res, void *data)
113 {
114         struct pci_root_info *info = data;
115         struct acpi_resource_address64 addr;
116         acpi_status status;
117
118         status = resource_to_addr(acpi_res, &addr);
119         if (ACPI_SUCCESS(status))
120                 info->res_num++;
121         return AE_OK;
122 }
123
124 static acpi_status
125 setup_resource(struct acpi_resource *acpi_res, void *data)
126 {
127         struct pci_root_info *info = data;
128         struct resource *res;
129         struct acpi_resource_address64 addr;
130         acpi_status status;
131         unsigned long flags;
132         struct resource *root, *conflict;
133         u64 start, end;
134
135         status = resource_to_addr(acpi_res, &addr);
136         if (!ACPI_SUCCESS(status))
137                 return AE_OK;
138
139         if (addr.resource_type == ACPI_MEMORY_RANGE) {
140                 root = &iomem_resource;
141                 flags = IORESOURCE_MEM;
142                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
143                         flags |= IORESOURCE_PREFETCH;
144         } else if (addr.resource_type == ACPI_IO_RANGE) {
145                 root = &ioport_resource;
146                 flags = IORESOURCE_IO;
147         } else
148                 return AE_OK;
149
150         start = addr.minimum + addr.translation_offset;
151         end = addr.maximum + addr.translation_offset;
152
153         res = &info->res[info->res_num];
154         res->name = info->name;
155         res->flags = flags;
156         res->start = start;
157         res->end = end;
158         res->child = NULL;
159
160         if (!pci_use_crs) {
161                 dev_printk(KERN_DEBUG, &info->bridge->dev,
162                            "host bridge window %pR (ignored)\n", res);
163                 return AE_OK;
164         }
165
166         conflict = insert_resource_conflict(root, res);
167         if (conflict) {
168                 dev_err(&info->bridge->dev,
169                         "address space collision: host bridge window %pR "
170                         "conflicts with %s %pR\n",
171                         res, conflict->name, conflict);
172         } else {
173                 pci_bus_add_resource(info->bus, res, 0);
174                 info->res_num++;
175                 if (addr.translation_offset)
176                         dev_info(&info->bridge->dev, "host bridge window %pR "
177                                  "(PCI address [%#llx-%#llx])\n",
178                                  res, res->start - addr.translation_offset,
179                                  res->end - addr.translation_offset);
180                 else
181                         dev_info(&info->bridge->dev,
182                                  "host bridge window %pR\n", res);
183         }
184         return AE_OK;
185 }
186
187 static void
188 get_current_resources(struct acpi_device *device, int busnum,
189                         int domain, struct pci_bus *bus)
190 {
191         struct pci_root_info info;
192         size_t size;
193
194         if (pci_use_crs)
195                 pci_bus_remove_resources(bus);
196
197         info.bridge = device;
198         info.bus = bus;
199         info.res_num = 0;
200         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
201                                 &info);
202         if (!info.res_num)
203                 return;
204
205         size = sizeof(*info.res) * info.res_num;
206         info.res = kmalloc(size, GFP_KERNEL);
207         if (!info.res)
208                 goto res_alloc_fail;
209
210         info.name = kmalloc(16, GFP_KERNEL);
211         if (!info.name)
212                 goto name_alloc_fail;
213         sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
214
215         info.res_num = 0;
216         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
217                                 &info);
218
219         return;
220
221 name_alloc_fail:
222         kfree(info.res);
223 res_alloc_fail:
224         return;
225 }
226
227 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
228 {
229         struct pci_bus *bus;
230         struct pci_sysdata *sd;
231         int node;
232 #ifdef CONFIG_ACPI_NUMA
233         int pxm;
234 #endif
235
236         if (domain && !pci_domains_supported) {
237                 printk(KERN_WARNING "pci_bus %04x:%02x: "
238                        "ignored (multiple domains not supported)\n",
239                        domain, busnum);
240                 return NULL;
241         }
242
243         node = -1;
244 #ifdef CONFIG_ACPI_NUMA
245         pxm = acpi_get_pxm(device->handle);
246         if (pxm >= 0)
247                 node = pxm_to_node(pxm);
248         if (node != -1)
249                 set_mp_bus_to_node(busnum, node);
250         else
251 #endif
252                 node = get_mp_bus_to_node(busnum);
253
254         if (node != -1 && !node_online(node))
255                 node = -1;
256
257         /* Allocate per-root-bus (not per bus) arch-specific data.
258          * TODO: leak; this memory is never freed.
259          * It's arguable whether it's worth the trouble to care.
260          */
261         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
262         if (!sd) {
263                 printk(KERN_WARNING "pci_bus %04x:%02x: "
264                        "ignored (out of memory)\n", domain, busnum);
265                 return NULL;
266         }
267
268         sd->domain = domain;
269         sd->node = node;
270         /*
271          * Maybe the desired pci bus has been already scanned. In such case
272          * it is unnecessary to scan the pci bus with the given domain,busnum.
273          */
274         bus = pci_find_bus(domain, busnum);
275         if (bus) {
276                 /*
277                  * If the desired bus exits, the content of bus->sysdata will
278                  * be replaced by sd.
279                  */
280                 memcpy(bus->sysdata, sd, sizeof(*sd));
281                 kfree(sd);
282         } else {
283                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
284                 if (bus) {
285                         get_current_resources(device, busnum, domain, bus);
286                         bus->subordinate = pci_scan_child_bus(bus);
287                 }
288         }
289
290         if (!bus)
291                 kfree(sd);
292
293         if (bus && node != -1) {
294 #ifdef CONFIG_ACPI_NUMA
295                 if (pxm >= 0)
296                         dev_printk(KERN_DEBUG, &bus->dev,
297                                    "on NUMA node %d (pxm %d)\n", node, pxm);
298 #else
299                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
300 #endif
301         }
302
303         return bus;
304 }
305
306 int __init pci_acpi_init(void)
307 {
308         struct pci_dev *dev = NULL;
309
310         if (acpi_noirq)
311                 return -ENODEV;
312
313         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
314         acpi_irq_penalty_init();
315         pcibios_enable_irq = acpi_pci_irq_enable;
316         pcibios_disable_irq = acpi_pci_irq_disable;
317         x86_init.pci.init_irq = x86_init_noop;
318
319         if (pci_routeirq) {
320                 /*
321                  * PCI IRQ routing is set up by pci_enable_device(), but we
322                  * also do it here in case there are still broken drivers that
323                  * don't use pci_enable_device().
324                  */
325                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
326                 for_each_pci_dev(dev)
327                         acpi_pci_irq_enable(dev);
328         }
329
330         return 0;
331 }