PCI/sysfs: move bus cpuaffinity to class dev_attrs
[linux-2.6.git] / drivers / pci / setup-res.c
1 /*
2  *      drivers/pci/setup-res.c
3  *
4  * Extruded from code written by
5  *      Dave Rusling (david.rusling@reo.mts.dec.com)
6  *      David Mosberger (davidm@cs.arizona.edu)
7  *      David Miller (davem@redhat.com)
8  *
9  * Support routines for initializing a PCI subsystem.
10  */
11
12 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
13
14 /*
15  * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
16  *           Resource sorting
17  */
18
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/pci.h>
22 #include <linux/errno.h>
23 #include <linux/ioport.h>
24 #include <linux/cache.h>
25 #include <linux/slab.h>
26 #include "pci.h"
27
28
29 void pci_update_resource(struct pci_dev *dev, int resno)
30 {
31         struct pci_bus_region region;
32         u32 new, check, mask;
33         int reg;
34         enum pci_bar_type type;
35         struct resource *res = dev->resource + resno;
36
37         /*
38          * Ignore resources for unimplemented BARs and unused resource slots
39          * for 64 bit BARs.
40          */
41         if (!res->flags)
42                 return;
43
44         /*
45          * Ignore non-moveable resources.  This might be legacy resources for
46          * which no functional BAR register exists or another important
47          * system resource we shouldn't move around.
48          */
49         if (res->flags & IORESOURCE_PCI_FIXED)
50                 return;
51
52         pcibios_resource_to_bus(dev, &region, res);
53
54         new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
55         if (res->flags & IORESOURCE_IO)
56                 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
57         else
58                 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
59
60         reg = pci_resource_bar(dev, resno, &type);
61         if (!reg)
62                 return;
63         if (type != pci_bar_unknown) {
64                 if (!(res->flags & IORESOURCE_ROM_ENABLE))
65                         return;
66                 new |= PCI_ROM_ADDRESS_ENABLE;
67         }
68
69         pci_write_config_dword(dev, reg, new);
70         pci_read_config_dword(dev, reg, &check);
71
72         if ((new ^ check) & mask) {
73                 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
74                         resno, new, check);
75         }
76
77         if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
78             (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
79                 new = region.start >> 16 >> 16;
80                 pci_write_config_dword(dev, reg + 4, new);
81                 pci_read_config_dword(dev, reg + 4, &check);
82                 if (check != new) {
83                         dev_err(&dev->dev, "BAR %d: error updating "
84                                "(high %#08x != %#08x)\n", resno, new, check);
85                 }
86         }
87         res->flags &= ~IORESOURCE_UNSET;
88         dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n",
89                  resno, res, (unsigned long long)region.start,
90                  (unsigned long long)region.end);
91 }
92
93 int pci_claim_resource(struct pci_dev *dev, int resource)
94 {
95         struct resource *res = &dev->resource[resource];
96         struct resource *root, *conflict;
97
98         root = pci_find_parent_resource(dev, res);
99         if (!root) {
100                 dev_info(&dev->dev, "no compatible bridge window for %pR\n",
101                          res);
102                 return -EINVAL;
103         }
104
105         conflict = request_resource_conflict(root, res);
106         if (conflict) {
107                 dev_info(&dev->dev,
108                          "address space collision: %pR conflicts with %s %pR\n",
109                          res, conflict->name, conflict);
110                 return -EBUSY;
111         }
112
113         return 0;
114 }
115 EXPORT_SYMBOL(pci_claim_resource);
116
117 #ifdef CONFIG_PCI_QUIRKS
118 void pci_disable_bridge_window(struct pci_dev *dev)
119 {
120         dev_info(&dev->dev, "disabling bridge mem windows\n");
121
122         /* MMIO Base/Limit */
123         pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
124
125         /* Prefetchable MMIO Base/Limit */
126         pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
127         pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
128         pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
129 }
130 #endif  /* CONFIG_PCI_QUIRKS */
131
132 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
133                                  int resno)
134 {
135         struct resource *res = dev->resource + resno;
136         resource_size_t size, min, align;
137         int ret;
138
139         size = resource_size(res);
140         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
141         align = pci_resource_alignment(dev, res);
142
143         /* First, try exact prefetching match.. */
144         ret = pci_bus_alloc_resource(bus, res, size, align, min,
145                                      IORESOURCE_PREFETCH,
146                                      pcibios_align_resource, dev);
147
148         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
149                 /*
150                  * That failed.
151                  *
152                  * But a prefetching area can handle a non-prefetching
153                  * window (it will just not perform as well).
154                  */
155                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
156                                              pcibios_align_resource, dev);
157         }
158
159         if (ret < 0 && dev->fw_addr[resno]) {
160                 struct resource *root, *conflict;
161                 resource_size_t start, end;
162
163                 /*
164                  * If we failed to assign anything, let's try the address
165                  * where firmware left it.  That at least has a chance of
166                  * working, which is better than just leaving it disabled.
167                  */
168
169                 if (res->flags & IORESOURCE_IO)
170                         root = &ioport_resource;
171                 else
172                         root = &iomem_resource;
173
174                 start = res->start;
175                 end = res->end;
176                 res->start = dev->fw_addr[resno];
177                 res->end = res->start + size - 1;
178                 dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
179                          resno, res);
180                 conflict = request_resource_conflict(root, res);
181                 if (conflict) {
182                         dev_info(&dev->dev,
183                                  "BAR %d: %pR conflicts with %s %pR\n", resno,
184                                  res, conflict->name, conflict);
185                         res->start = start;
186                         res->end = end;
187                 } else
188                         ret = 0;
189         }
190
191         if (!ret) {
192                 res->flags &= ~IORESOURCE_STARTALIGN;
193                 dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
194                 if (resno < PCI_BRIDGE_RESOURCES)
195                         pci_update_resource(dev, resno);
196         }
197
198         return ret;
199 }
200
201 int pci_assign_resource(struct pci_dev *dev, int resno)
202 {
203         struct resource *res = dev->resource + resno;
204         resource_size_t align;
205         struct pci_bus *bus;
206         int ret;
207         char *type;
208
209         align = pci_resource_alignment(dev, res);
210         if (!align) {
211                 dev_info(&dev->dev, "BAR %d: can't assign %pR "
212                          "(bogus alignment)\n", resno, res);
213                 return -EINVAL;
214         }
215
216         bus = dev->bus;
217         while ((ret = __pci_assign_resource(bus, dev, resno))) {
218                 if (bus->parent && bus->self->transparent)
219                         bus = bus->parent;
220                 else
221                         bus = NULL;
222                 if (bus)
223                         continue;
224                 break;
225         }
226
227         if (ret) {
228                 if (res->flags & IORESOURCE_MEM)
229                         if (res->flags & IORESOURCE_PREFETCH)
230                                 type = "mem pref";
231                         else
232                                 type = "mem";
233                 else if (res->flags & IORESOURCE_IO)
234                         type = "io";
235                 else
236                         type = "unknown";
237                 dev_info(&dev->dev,
238                          "BAR %d: can't assign %s (size %#llx)\n",
239                          resno, type, (unsigned long long) resource_size(res));
240         }
241
242         return ret;
243 }
244
245 /* Sort resources by alignment */
246 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
247 {
248         int i;
249
250         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
251                 struct resource *r;
252                 struct resource_list *list, *tmp;
253                 resource_size_t r_align;
254
255                 r = &dev->resource[i];
256
257                 if (r->flags & IORESOURCE_PCI_FIXED)
258                         continue;
259
260                 if (!(r->flags) || r->parent)
261                         continue;
262
263                 r_align = pci_resource_alignment(dev, r);
264                 if (!r_align) {
265                         dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
266                                  i, r);
267                         continue;
268                 }
269                 for (list = head; ; list = list->next) {
270                         resource_size_t align = 0;
271                         struct resource_list *ln = list->next;
272
273                         if (ln)
274                                 align = pci_resource_alignment(ln->dev, ln->res);
275
276                         if (r_align > align) {
277                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
278                                 if (!tmp)
279                                         panic("pdev_sort_resources(): "
280                                               "kmalloc() failed!\n");
281                                 tmp->next = ln;
282                                 tmp->res = r;
283                                 tmp->dev = dev;
284                                 list->next = tmp;
285                                 break;
286                         }
287                 }
288         }
289 }
290
291 int pci_enable_resources(struct pci_dev *dev, int mask)
292 {
293         u16 cmd, old_cmd;
294         int i;
295         struct resource *r;
296
297         pci_read_config_word(dev, PCI_COMMAND, &cmd);
298         old_cmd = cmd;
299
300         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
301                 if (!(mask & (1 << i)))
302                         continue;
303
304                 r = &dev->resource[i];
305
306                 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
307                         continue;
308                 if ((i == PCI_ROM_RESOURCE) &&
309                                 (!(r->flags & IORESOURCE_ROM_ENABLE)))
310                         continue;
311
312                 if (!r->parent) {
313                         dev_err(&dev->dev, "device not available "
314                                 "(can't reserve %pR)\n", r);
315                         return -EINVAL;
316                 }
317
318                 if (r->flags & IORESOURCE_IO)
319                         cmd |= PCI_COMMAND_IO;
320                 if (r->flags & IORESOURCE_MEM)
321                         cmd |= PCI_COMMAND_MEMORY;
322         }
323
324         if (cmd != old_cmd) {
325                 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
326                          old_cmd, cmd);
327                 pci_write_config_word(dev, PCI_COMMAND, cmd);
328         }
329         return 0;
330 }