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 * Maybe the desired pci bus has been already scanned. In such case
224 * it is unnecessary to scan the pci bus with the given domain,busnum.
225 */
226 bus = pci_find_bus(domain, busnum);
227 if (bus) {
228 /*
229 * If the desired bus exits, the content of bus->sysdata will
230 * be replaced by sd.
231 */
232 memcpy(bus->sysdata, sd, sizeof(*sd));
233 kfree(sd);
234 } else
235 bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
236
237 if (!bus)
238 kfree(sd);
239
240 #ifdef CONFIG_ACPI_NUMA
241 if (bus != NULL) {
242 if (pxm >= 0) {
243 printk("bus %d -> pxm %d -> node %d\n",
244 busnum, pxm, pxm_to_node(pxm));
245 }
246 }
247 #endif
248
249 if (bus && (pci_probe & PCI_USE__CRS))
250 get_current_resources(device, busnum, bus);
251
252 return bus;
253 }
254
255 extern int pci_routeirq;
256 static int __init pci_acpi_init(void)
257 {
258 struct pci_dev *dev = NULL;
259
260 if (pcibios_scanned)
261 return 0;
262
263 if (acpi_noirq)
264 return 0;
265
266 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
267 acpi_irq_penalty_init();
268 pcibios_scanned++;
269 pcibios_enable_irq = acpi_pci_irq_enable;
270 pcibios_disable_irq = acpi_pci_irq_disable;
271
272 if (pci_routeirq) {
273 /*
274 * PCI IRQ routing is set up by pci_enable_device(), but we
275 * also do it here in case there are still broken drivers that
276 * don't use pci_enable_device().
277 */
278 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
279 for_each_pci_dev(dev)
280 acpi_pci_irq_enable(dev);
281 } else
282 printk(KERN_INFO "PCI: If a device doesn't work, try \"pci=routeirq\". If it helps, post a report\n");
283
284 #ifdef CONFIG_X86_IO_APIC
285 if (acpi_ioapic)
286 print_IO_APIC();
287 #endif
288
289 return 0;
290 }
291 subsys_initcall(pci_acpi_init);
292
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