Merge remote-tracking branches 'regulator/fix/email' and 'regulator/fix/qcom-smd...
[cascardo/linux.git] / drivers / pci / setup-bus.c
1 /*
2  *      drivers/pci/setup-bus.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 /*
13  * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
14  *           PCI-PCI bridges cleanup, sorted resource allocation.
15  * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
16  *           Converted to allocation in 3 passes, which gives
17  *           tighter packing. Prefetchable range support.
18  */
19
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/pci.h>
24 #include <linux/errno.h>
25 #include <linux/ioport.h>
26 #include <linux/cache.h>
27 #include <linux/slab.h>
28 #include "pci.h"
29
30 unsigned int pci_flags;
31
32 struct pci_dev_resource {
33         struct list_head list;
34         struct resource *res;
35         struct pci_dev *dev;
36         resource_size_t start;
37         resource_size_t end;
38         resource_size_t add_size;
39         resource_size_t min_align;
40         unsigned long flags;
41 };
42
43 static void free_list(struct list_head *head)
44 {
45         struct pci_dev_resource *dev_res, *tmp;
46
47         list_for_each_entry_safe(dev_res, tmp, head, list) {
48                 list_del(&dev_res->list);
49                 kfree(dev_res);
50         }
51 }
52
53 /**
54  * add_to_list() - add a new resource tracker to the list
55  * @head:       Head of the list
56  * @dev:        device corresponding to which the resource
57  *              belongs
58  * @res:        The resource to be tracked
59  * @add_size:   additional size to be optionally added
60  *              to the resource
61  */
62 static int add_to_list(struct list_head *head,
63                  struct pci_dev *dev, struct resource *res,
64                  resource_size_t add_size, resource_size_t min_align)
65 {
66         struct pci_dev_resource *tmp;
67
68         tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
69         if (!tmp) {
70                 pr_warn("add_to_list: kmalloc() failed!\n");
71                 return -ENOMEM;
72         }
73
74         tmp->res = res;
75         tmp->dev = dev;
76         tmp->start = res->start;
77         tmp->end = res->end;
78         tmp->flags = res->flags;
79         tmp->add_size = add_size;
80         tmp->min_align = min_align;
81
82         list_add(&tmp->list, head);
83
84         return 0;
85 }
86
87 static void remove_from_list(struct list_head *head,
88                                  struct resource *res)
89 {
90         struct pci_dev_resource *dev_res, *tmp;
91
92         list_for_each_entry_safe(dev_res, tmp, head, list) {
93                 if (dev_res->res == res) {
94                         list_del(&dev_res->list);
95                         kfree(dev_res);
96                         break;
97                 }
98         }
99 }
100
101 static struct pci_dev_resource *res_to_dev_res(struct list_head *head,
102                                                struct resource *res)
103 {
104         struct pci_dev_resource *dev_res;
105
106         list_for_each_entry(dev_res, head, list) {
107                 if (dev_res->res == res) {
108                         int idx = res - &dev_res->dev->resource[0];
109
110                         dev_printk(KERN_DEBUG, &dev_res->dev->dev,
111                                  "res[%d]=%pR res_to_dev_res add_size %llx min_align %llx\n",
112                                  idx, dev_res->res,
113                                  (unsigned long long)dev_res->add_size,
114                                  (unsigned long long)dev_res->min_align);
115
116                         return dev_res;
117                 }
118         }
119
120         return NULL;
121 }
122
123 static resource_size_t get_res_add_size(struct list_head *head,
124                                         struct resource *res)
125 {
126         struct pci_dev_resource *dev_res;
127
128         dev_res = res_to_dev_res(head, res);
129         return dev_res ? dev_res->add_size : 0;
130 }
131
132 static resource_size_t get_res_add_align(struct list_head *head,
133                                          struct resource *res)
134 {
135         struct pci_dev_resource *dev_res;
136
137         dev_res = res_to_dev_res(head, res);
138         return dev_res ? dev_res->min_align : 0;
139 }
140
141
142 /* Sort resources by alignment */
143 static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
144 {
145         int i;
146
147         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
148                 struct resource *r;
149                 struct pci_dev_resource *dev_res, *tmp;
150                 resource_size_t r_align;
151                 struct list_head *n;
152
153                 r = &dev->resource[i];
154
155                 if (r->flags & IORESOURCE_PCI_FIXED)
156                         continue;
157
158                 if (!(r->flags) || r->parent)
159                         continue;
160
161                 r_align = pci_resource_alignment(dev, r);
162                 if (!r_align) {
163                         dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
164                                  i, r);
165                         continue;
166                 }
167
168                 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
169                 if (!tmp)
170                         panic("pdev_sort_resources(): kmalloc() failed!\n");
171                 tmp->res = r;
172                 tmp->dev = dev;
173
174                 /* fallback is smallest one or list is empty*/
175                 n = head;
176                 list_for_each_entry(dev_res, head, list) {
177                         resource_size_t align;
178
179                         align = pci_resource_alignment(dev_res->dev,
180                                                          dev_res->res);
181
182                         if (r_align > align) {
183                                 n = &dev_res->list;
184                                 break;
185                         }
186                 }
187                 /* Insert it just before n*/
188                 list_add_tail(&tmp->list, n);
189         }
190 }
191
192 static void __dev_sort_resources(struct pci_dev *dev,
193                                  struct list_head *head)
194 {
195         u16 class = dev->class >> 8;
196
197         /* Don't touch classless devices or host bridges or ioapics.  */
198         if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
199                 return;
200
201         /* Don't touch ioapic devices already enabled by firmware */
202         if (class == PCI_CLASS_SYSTEM_PIC) {
203                 u16 command;
204                 pci_read_config_word(dev, PCI_COMMAND, &command);
205                 if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
206                         return;
207         }
208
209         pdev_sort_resources(dev, head);
210 }
211
212 static inline void reset_resource(struct resource *res)
213 {
214         res->start = 0;
215         res->end = 0;
216         res->flags = 0;
217 }
218
219 /**
220  * reassign_resources_sorted() - satisfy any additional resource requests
221  *
222  * @realloc_head : head of the list tracking requests requiring additional
223  *             resources
224  * @head     : head of the list tracking requests with allocated
225  *             resources
226  *
227  * Walk through each element of the realloc_head and try to procure
228  * additional resources for the element, provided the element
229  * is in the head list.
230  */
231 static void reassign_resources_sorted(struct list_head *realloc_head,
232                 struct list_head *head)
233 {
234         struct resource *res;
235         struct pci_dev_resource *add_res, *tmp;
236         struct pci_dev_resource *dev_res;
237         resource_size_t add_size, align;
238         int idx;
239
240         list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
241                 bool found_match = false;
242
243                 res = add_res->res;
244                 /* skip resource that has been reset */
245                 if (!res->flags)
246                         goto out;
247
248                 /* skip this resource if not found in head list */
249                 list_for_each_entry(dev_res, head, list) {
250                         if (dev_res->res == res) {
251                                 found_match = true;
252                                 break;
253                         }
254                 }
255                 if (!found_match)/* just skip */
256                         continue;
257
258                 idx = res - &add_res->dev->resource[0];
259                 add_size = add_res->add_size;
260                 align = add_res->min_align;
261                 if (!resource_size(res)) {
262                         res->start = align;
263                         res->end = res->start + add_size - 1;
264                         if (pci_assign_resource(add_res->dev, idx))
265                                 reset_resource(res);
266                 } else {
267                         res->flags |= add_res->flags &
268                                  (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
269                         if (pci_reassign_resource(add_res->dev, idx,
270                                                   add_size, align))
271                                 dev_printk(KERN_DEBUG, &add_res->dev->dev,
272                                            "failed to add %llx res[%d]=%pR\n",
273                                            (unsigned long long)add_size,
274                                            idx, res);
275                 }
276 out:
277                 list_del(&add_res->list);
278                 kfree(add_res);
279         }
280 }
281
282 /**
283  * assign_requested_resources_sorted() - satisfy resource requests
284  *
285  * @head : head of the list tracking requests for resources
286  * @fail_head : head of the list tracking requests that could
287  *              not be allocated
288  *
289  * Satisfy resource requests of each element in the list. Add
290  * requests that could not satisfied to the failed_list.
291  */
292 static void assign_requested_resources_sorted(struct list_head *head,
293                                  struct list_head *fail_head)
294 {
295         struct resource *res;
296         struct pci_dev_resource *dev_res;
297         int idx;
298
299         list_for_each_entry(dev_res, head, list) {
300                 res = dev_res->res;
301                 idx = res - &dev_res->dev->resource[0];
302                 if (resource_size(res) &&
303                     pci_assign_resource(dev_res->dev, idx)) {
304                         if (fail_head) {
305                                 /*
306                                  * if the failed res is for ROM BAR, and it will
307                                  * be enabled later, don't add it to the list
308                                  */
309                                 if (!((idx == PCI_ROM_RESOURCE) &&
310                                       (!(res->flags & IORESOURCE_ROM_ENABLE))))
311                                         add_to_list(fail_head,
312                                                     dev_res->dev, res,
313                                                     0 /* don't care */,
314                                                     0 /* don't care */);
315                         }
316                         reset_resource(res);
317                 }
318         }
319 }
320
321 static unsigned long pci_fail_res_type_mask(struct list_head *fail_head)
322 {
323         struct pci_dev_resource *fail_res;
324         unsigned long mask = 0;
325
326         /* check failed type */
327         list_for_each_entry(fail_res, fail_head, list)
328                 mask |= fail_res->flags;
329
330         /*
331          * one pref failed resource will set IORESOURCE_MEM,
332          * as we can allocate pref in non-pref range.
333          * Will release all assigned non-pref sibling resources
334          * according to that bit.
335          */
336         return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH);
337 }
338
339 static bool pci_need_to_release(unsigned long mask, struct resource *res)
340 {
341         if (res->flags & IORESOURCE_IO)
342                 return !!(mask & IORESOURCE_IO);
343
344         /* check pref at first */
345         if (res->flags & IORESOURCE_PREFETCH) {
346                 if (mask & IORESOURCE_PREFETCH)
347                         return true;
348                 /* count pref if its parent is non-pref */
349                 else if ((mask & IORESOURCE_MEM) &&
350                          !(res->parent->flags & IORESOURCE_PREFETCH))
351                         return true;
352                 else
353                         return false;
354         }
355
356         if (res->flags & IORESOURCE_MEM)
357                 return !!(mask & IORESOURCE_MEM);
358
359         return false;   /* should not get here */
360 }
361
362 static void __assign_resources_sorted(struct list_head *head,
363                                  struct list_head *realloc_head,
364                                  struct list_head *fail_head)
365 {
366         /*
367          * Should not assign requested resources at first.
368          *   they could be adjacent, so later reassign can not reallocate
369          *   them one by one in parent resource window.
370          * Try to assign requested + add_size at beginning
371          *  if could do that, could get out early.
372          *  if could not do that, we still try to assign requested at first,
373          *    then try to reassign add_size for some resources.
374          *
375          * Separate three resource type checking if we need to release
376          * assigned resource after requested + add_size try.
377          *      1. if there is io port assign fail, will release assigned
378          *         io port.
379          *      2. if there is pref mmio assign fail, release assigned
380          *         pref mmio.
381          *         if assigned pref mmio's parent is non-pref mmio and there
382          *         is non-pref mmio assign fail, will release that assigned
383          *         pref mmio.
384          *      3. if there is non-pref mmio assign fail or pref mmio
385          *         assigned fail, will release assigned non-pref mmio.
386          */
387         LIST_HEAD(save_head);
388         LIST_HEAD(local_fail_head);
389         struct pci_dev_resource *save_res;
390         struct pci_dev_resource *dev_res, *tmp_res, *dev_res2;
391         unsigned long fail_type;
392         resource_size_t add_align, align;
393
394         /* Check if optional add_size is there */
395         if (!realloc_head || list_empty(realloc_head))
396                 goto requested_and_reassign;
397
398         /* Save original start, end, flags etc at first */
399         list_for_each_entry(dev_res, head, list) {
400                 if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
401                         free_list(&save_head);
402                         goto requested_and_reassign;
403                 }
404         }
405
406         /* Update res in head list with add_size in realloc_head list */
407         list_for_each_entry_safe(dev_res, tmp_res, head, list) {
408                 dev_res->res->end += get_res_add_size(realloc_head,
409                                                         dev_res->res);
410
411                 /*
412                  * There are two kinds of additional resources in the list:
413                  * 1. bridge resource  -- IORESOURCE_STARTALIGN
414                  * 2. SR-IOV resource   -- IORESOURCE_SIZEALIGN
415                  * Here just fix the additional alignment for bridge
416                  */
417                 if (!(dev_res->res->flags & IORESOURCE_STARTALIGN))
418                         continue;
419
420                 add_align = get_res_add_align(realloc_head, dev_res->res);
421
422                 /*
423                  * The "head" list is sorted by the alignment to make sure
424                  * resources with bigger alignment will be assigned first.
425                  * After we change the alignment of a dev_res in "head" list,
426                  * we need to reorder the list by alignment to make it
427                  * consistent.
428                  */
429                 if (add_align > dev_res->res->start) {
430                         resource_size_t r_size = resource_size(dev_res->res);
431
432                         dev_res->res->start = add_align;
433                         dev_res->res->end = add_align + r_size - 1;
434
435                         list_for_each_entry(dev_res2, head, list) {
436                                 align = pci_resource_alignment(dev_res2->dev,
437                                                                dev_res2->res);
438                                 if (add_align > align) {
439                                         list_move_tail(&dev_res->list,
440                                                        &dev_res2->list);
441                                         break;
442                                 }
443                         }
444                 }
445
446         }
447
448         /* Try updated head list with add_size added */
449         assign_requested_resources_sorted(head, &local_fail_head);
450
451         /* all assigned with add_size ? */
452         if (list_empty(&local_fail_head)) {
453                 /* Remove head list from realloc_head list */
454                 list_for_each_entry(dev_res, head, list)
455                         remove_from_list(realloc_head, dev_res->res);
456                 free_list(&save_head);
457                 free_list(head);
458                 return;
459         }
460
461         /* check failed type */
462         fail_type = pci_fail_res_type_mask(&local_fail_head);
463         /* remove not need to be released assigned res from head list etc */
464         list_for_each_entry_safe(dev_res, tmp_res, head, list)
465                 if (dev_res->res->parent &&
466                     !pci_need_to_release(fail_type, dev_res->res)) {
467                         /* remove it from realloc_head list */
468                         remove_from_list(realloc_head, dev_res->res);
469                         remove_from_list(&save_head, dev_res->res);
470                         list_del(&dev_res->list);
471                         kfree(dev_res);
472                 }
473
474         free_list(&local_fail_head);
475         /* Release assigned resource */
476         list_for_each_entry(dev_res, head, list)
477                 if (dev_res->res->parent)
478                         release_resource(dev_res->res);
479         /* Restore start/end/flags from saved list */
480         list_for_each_entry(save_res, &save_head, list) {
481                 struct resource *res = save_res->res;
482
483                 res->start = save_res->start;
484                 res->end = save_res->end;
485                 res->flags = save_res->flags;
486         }
487         free_list(&save_head);
488
489 requested_and_reassign:
490         /* Satisfy the must-have resource requests */
491         assign_requested_resources_sorted(head, fail_head);
492
493         /* Try to satisfy any additional optional resource
494                 requests */
495         if (realloc_head)
496                 reassign_resources_sorted(realloc_head, head);
497         free_list(head);
498 }
499
500 static void pdev_assign_resources_sorted(struct pci_dev *dev,
501                                  struct list_head *add_head,
502                                  struct list_head *fail_head)
503 {
504         LIST_HEAD(head);
505
506         __dev_sort_resources(dev, &head);
507         __assign_resources_sorted(&head, add_head, fail_head);
508
509 }
510
511 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
512                                          struct list_head *realloc_head,
513                                          struct list_head *fail_head)
514 {
515         struct pci_dev *dev;
516         LIST_HEAD(head);
517
518         list_for_each_entry(dev, &bus->devices, bus_list)
519                 __dev_sort_resources(dev, &head);
520
521         __assign_resources_sorted(&head, realloc_head, fail_head);
522 }
523
524 void pci_setup_cardbus(struct pci_bus *bus)
525 {
526         struct pci_dev *bridge = bus->self;
527         struct resource *res;
528         struct pci_bus_region region;
529
530         dev_info(&bridge->dev, "CardBus bridge to %pR\n",
531                  &bus->busn_res);
532
533         res = bus->resource[0];
534         pcibios_resource_to_bus(bridge->bus, &region, res);
535         if (res->flags & IORESOURCE_IO) {
536                 /*
537                  * The IO resource is allocated a range twice as large as it
538                  * would normally need.  This allows us to set both IO regs.
539                  */
540                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
541                 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
542                                         region.start);
543                 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
544                                         region.end);
545         }
546
547         res = bus->resource[1];
548         pcibios_resource_to_bus(bridge->bus, &region, res);
549         if (res->flags & IORESOURCE_IO) {
550                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
551                 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
552                                         region.start);
553                 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
554                                         region.end);
555         }
556
557         res = bus->resource[2];
558         pcibios_resource_to_bus(bridge->bus, &region, res);
559         if (res->flags & IORESOURCE_MEM) {
560                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
561                 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
562                                         region.start);
563                 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
564                                         region.end);
565         }
566
567         res = bus->resource[3];
568         pcibios_resource_to_bus(bridge->bus, &region, res);
569         if (res->flags & IORESOURCE_MEM) {
570                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
571                 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
572                                         region.start);
573                 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
574                                         region.end);
575         }
576 }
577 EXPORT_SYMBOL(pci_setup_cardbus);
578
579 /* Initialize bridges with base/limit values we have collected.
580    PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
581    requires that if there is no I/O ports or memory behind the
582    bridge, corresponding range must be turned off by writing base
583    value greater than limit to the bridge's base/limit registers.
584
585    Note: care must be taken when updating I/O base/limit registers
586    of bridges which support 32-bit I/O. This update requires two
587    config space writes, so it's quite possible that an I/O window of
588    the bridge will have some undesirable address (e.g. 0) after the
589    first write. Ditto 64-bit prefetchable MMIO.  */
590 static void pci_setup_bridge_io(struct pci_dev *bridge)
591 {
592         struct resource *res;
593         struct pci_bus_region region;
594         unsigned long io_mask;
595         u8 io_base_lo, io_limit_lo;
596         u16 l;
597         u32 io_upper16;
598
599         io_mask = PCI_IO_RANGE_MASK;
600         if (bridge->io_window_1k)
601                 io_mask = PCI_IO_1K_RANGE_MASK;
602
603         /* Set up the top and bottom of the PCI I/O segment for this bus. */
604         res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0];
605         pcibios_resource_to_bus(bridge->bus, &region, res);
606         if (res->flags & IORESOURCE_IO) {
607                 pci_read_config_word(bridge, PCI_IO_BASE, &l);
608                 io_base_lo = (region.start >> 8) & io_mask;
609                 io_limit_lo = (region.end >> 8) & io_mask;
610                 l = ((u16) io_limit_lo << 8) | io_base_lo;
611                 /* Set up upper 16 bits of I/O base/limit. */
612                 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
613                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
614         } else {
615                 /* Clear upper 16 bits of I/O base/limit. */
616                 io_upper16 = 0;
617                 l = 0x00f0;
618         }
619         /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
620         pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
621         /* Update lower 16 bits of I/O base/limit. */
622         pci_write_config_word(bridge, PCI_IO_BASE, l);
623         /* Update upper 16 bits of I/O base/limit. */
624         pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
625 }
626
627 static void pci_setup_bridge_mmio(struct pci_dev *bridge)
628 {
629         struct resource *res;
630         struct pci_bus_region region;
631         u32 l;
632
633         /* Set up the top and bottom of the PCI Memory segment for this bus. */
634         res = &bridge->resource[PCI_BRIDGE_RESOURCES + 1];
635         pcibios_resource_to_bus(bridge->bus, &region, res);
636         if (res->flags & IORESOURCE_MEM) {
637                 l = (region.start >> 16) & 0xfff0;
638                 l |= region.end & 0xfff00000;
639                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
640         } else {
641                 l = 0x0000fff0;
642         }
643         pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
644 }
645
646 static void pci_setup_bridge_mmio_pref(struct pci_dev *bridge)
647 {
648         struct resource *res;
649         struct pci_bus_region region;
650         u32 l, bu, lu;
651
652         /* Clear out the upper 32 bits of PREF limit.
653            If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
654            disables PREF range, which is ok. */
655         pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
656
657         /* Set up PREF base/limit. */
658         bu = lu = 0;
659         res = &bridge->resource[PCI_BRIDGE_RESOURCES + 2];
660         pcibios_resource_to_bus(bridge->bus, &region, res);
661         if (res->flags & IORESOURCE_PREFETCH) {
662                 l = (region.start >> 16) & 0xfff0;
663                 l |= region.end & 0xfff00000;
664                 if (res->flags & IORESOURCE_MEM_64) {
665                         bu = upper_32_bits(region.start);
666                         lu = upper_32_bits(region.end);
667                 }
668                 dev_info(&bridge->dev, "  bridge window %pR\n", res);
669         } else {
670                 l = 0x0000fff0;
671         }
672         pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
673
674         /* Set the upper 32 bits of PREF base & limit. */
675         pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
676         pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
677 }
678
679 static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
680 {
681         struct pci_dev *bridge = bus->self;
682
683         dev_info(&bridge->dev, "PCI bridge to %pR\n",
684                  &bus->busn_res);
685
686         if (type & IORESOURCE_IO)
687                 pci_setup_bridge_io(bridge);
688
689         if (type & IORESOURCE_MEM)
690                 pci_setup_bridge_mmio(bridge);
691
692         if (type & IORESOURCE_PREFETCH)
693                 pci_setup_bridge_mmio_pref(bridge);
694
695         pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
696 }
697
698 void __weak pcibios_setup_bridge(struct pci_bus *bus, unsigned long type)
699 {
700 }
701
702 void pci_setup_bridge(struct pci_bus *bus)
703 {
704         unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
705                                   IORESOURCE_PREFETCH;
706
707         pcibios_setup_bridge(bus, type);
708         __pci_setup_bridge(bus, type);
709 }
710
711
712 int pci_claim_bridge_resource(struct pci_dev *bridge, int i)
713 {
714         if (i < PCI_BRIDGE_RESOURCES || i > PCI_BRIDGE_RESOURCE_END)
715                 return 0;
716
717         if (pci_claim_resource(bridge, i) == 0)
718                 return 0;       /* claimed the window */
719
720         if ((bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI)
721                 return 0;
722
723         if (!pci_bus_clip_resource(bridge, i))
724                 return -EINVAL; /* clipping didn't change anything */
725
726         switch (i - PCI_BRIDGE_RESOURCES) {
727         case 0:
728                 pci_setup_bridge_io(bridge);
729                 break;
730         case 1:
731                 pci_setup_bridge_mmio(bridge);
732                 break;
733         case 2:
734                 pci_setup_bridge_mmio_pref(bridge);
735                 break;
736         default:
737                 return -EINVAL;
738         }
739
740         if (pci_claim_resource(bridge, i) == 0)
741                 return 0;       /* claimed a smaller window */
742
743         return -EINVAL;
744 }
745
746 /* Check whether the bridge supports optional I/O and
747    prefetchable memory ranges. If not, the respective
748    base/limit registers must be read-only and read as 0. */
749 static void pci_bridge_check_ranges(struct pci_bus *bus)
750 {
751         u16 io;
752         u32 pmem;
753         struct pci_dev *bridge = bus->self;
754         struct resource *b_res;
755
756         b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
757         b_res[1].flags |= IORESOURCE_MEM;
758
759         pci_read_config_word(bridge, PCI_IO_BASE, &io);
760         if (!io) {
761                 pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0);
762                 pci_read_config_word(bridge, PCI_IO_BASE, &io);
763                 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
764         }
765         if (io)
766                 b_res[0].flags |= IORESOURCE_IO;
767
768         /*  DECchip 21050 pass 2 errata: the bridge may miss an address
769             disconnect boundary by one PCI data phase.
770             Workaround: do not use prefetching on this device. */
771         if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
772                 return;
773
774         pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
775         if (!pmem) {
776                 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
777                                                0xffe0fff0);
778                 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
779                 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
780         }
781         if (pmem) {
782                 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
783                 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
784                     PCI_PREF_RANGE_TYPE_64) {
785                         b_res[2].flags |= IORESOURCE_MEM_64;
786                         b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
787                 }
788         }
789
790         /* double check if bridge does support 64 bit pref */
791         if (b_res[2].flags & IORESOURCE_MEM_64) {
792                 u32 mem_base_hi, tmp;
793                 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
794                                          &mem_base_hi);
795                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
796                                                0xffffffff);
797                 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
798                 if (!tmp)
799                         b_res[2].flags &= ~IORESOURCE_MEM_64;
800                 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
801                                        mem_base_hi);
802         }
803 }
804
805 /* Helper function for sizing routines: find first available
806    bus resource of a given type. Note: we intentionally skip
807    the bus resources which have already been assigned (that is,
808    have non-NULL parent resource). */
809 static struct resource *find_free_bus_resource(struct pci_bus *bus,
810                          unsigned long type_mask, unsigned long type)
811 {
812         int i;
813         struct resource *r;
814
815         pci_bus_for_each_resource(bus, r, i) {
816                 if (r == &ioport_resource || r == &iomem_resource)
817                         continue;
818                 if (r && (r->flags & type_mask) == type && !r->parent)
819                         return r;
820         }
821         return NULL;
822 }
823
824 static resource_size_t calculate_iosize(resource_size_t size,
825                 resource_size_t min_size,
826                 resource_size_t size1,
827                 resource_size_t old_size,
828                 resource_size_t align)
829 {
830         if (size < min_size)
831                 size = min_size;
832         if (old_size == 1)
833                 old_size = 0;
834         /* To be fixed in 2.5: we should have sort of HAVE_ISA
835            flag in the struct pci_bus. */
836 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
837         size = (size & 0xff) + ((size & ~0xffUL) << 2);
838 #endif
839         size = ALIGN(size + size1, align);
840         if (size < old_size)
841                 size = old_size;
842         return size;
843 }
844
845 static resource_size_t calculate_memsize(resource_size_t size,
846                 resource_size_t min_size,
847                 resource_size_t size1,
848                 resource_size_t old_size,
849                 resource_size_t align)
850 {
851         if (size < min_size)
852                 size = min_size;
853         if (old_size == 1)
854                 old_size = 0;
855         if (size < old_size)
856                 size = old_size;
857         size = ALIGN(size + size1, align);
858         return size;
859 }
860
861 resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus,
862                                                 unsigned long type)
863 {
864         return 1;
865 }
866
867 #define PCI_P2P_DEFAULT_MEM_ALIGN       0x100000        /* 1MiB */
868 #define PCI_P2P_DEFAULT_IO_ALIGN        0x1000          /* 4KiB */
869 #define PCI_P2P_DEFAULT_IO_ALIGN_1K     0x400           /* 1KiB */
870
871 static resource_size_t window_alignment(struct pci_bus *bus,
872                                         unsigned long type)
873 {
874         resource_size_t align = 1, arch_align;
875
876         if (type & IORESOURCE_MEM)
877                 align = PCI_P2P_DEFAULT_MEM_ALIGN;
878         else if (type & IORESOURCE_IO) {
879                 /*
880                  * Per spec, I/O windows are 4K-aligned, but some
881                  * bridges have an extension to support 1K alignment.
882                  */
883                 if (bus->self->io_window_1k)
884                         align = PCI_P2P_DEFAULT_IO_ALIGN_1K;
885                 else
886                         align = PCI_P2P_DEFAULT_IO_ALIGN;
887         }
888
889         arch_align = pcibios_window_alignment(bus, type);
890         return max(align, arch_align);
891 }
892
893 /**
894  * pbus_size_io() - size the io window of a given bus
895  *
896  * @bus : the bus
897  * @min_size : the minimum io window that must to be allocated
898  * @add_size : additional optional io window
899  * @realloc_head : track the additional io window on this list
900  *
901  * Sizing the IO windows of the PCI-PCI bridge is trivial,
902  * since these windows have 1K or 4K granularity and the IO ranges
903  * of non-bridge PCI devices are limited to 256 bytes.
904  * We must be careful with the ISA aliasing though.
905  */
906 static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
907                 resource_size_t add_size, struct list_head *realloc_head)
908 {
909         struct pci_dev *dev;
910         struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO,
911                                                         IORESOURCE_IO);
912         resource_size_t size = 0, size0 = 0, size1 = 0;
913         resource_size_t children_add_size = 0;
914         resource_size_t min_align, align;
915
916         if (!b_res)
917                 return;
918
919         min_align = window_alignment(bus, IORESOURCE_IO);
920         list_for_each_entry(dev, &bus->devices, bus_list) {
921                 int i;
922
923                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
924                         struct resource *r = &dev->resource[i];
925                         unsigned long r_size;
926
927                         if (r->parent || !(r->flags & IORESOURCE_IO))
928                                 continue;
929                         r_size = resource_size(r);
930
931                         if (r_size < 0x400)
932                                 /* Might be re-aligned for ISA */
933                                 size += r_size;
934                         else
935                                 size1 += r_size;
936
937                         align = pci_resource_alignment(dev, r);
938                         if (align > min_align)
939                                 min_align = align;
940
941                         if (realloc_head)
942                                 children_add_size += get_res_add_size(realloc_head, r);
943                 }
944         }
945
946         size0 = calculate_iosize(size, min_size, size1,
947                         resource_size(b_res), min_align);
948         if (children_add_size > add_size)
949                 add_size = children_add_size;
950         size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
951                 calculate_iosize(size, min_size, add_size + size1,
952                         resource_size(b_res), min_align);
953         if (!size0 && !size1) {
954                 if (b_res->start || b_res->end)
955                         dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
956                                  b_res, &bus->busn_res);
957                 b_res->flags = 0;
958                 return;
959         }
960
961         b_res->start = min_align;
962         b_res->end = b_res->start + size0 - 1;
963         b_res->flags |= IORESOURCE_STARTALIGN;
964         if (size1 > size0 && realloc_head) {
965                 add_to_list(realloc_head, bus->self, b_res, size1-size0,
966                             min_align);
967                 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx\n",
968                            b_res, &bus->busn_res,
969                            (unsigned long long)size1-size0);
970         }
971 }
972
973 static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
974                                                   int max_order)
975 {
976         resource_size_t align = 0;
977         resource_size_t min_align = 0;
978         int order;
979
980         for (order = 0; order <= max_order; order++) {
981                 resource_size_t align1 = 1;
982
983                 align1 <<= (order + 20);
984
985                 if (!align)
986                         min_align = align1;
987                 else if (ALIGN(align + min_align, min_align) < align1)
988                         min_align = align1 >> 1;
989                 align += aligns[order];
990         }
991
992         return min_align;
993 }
994
995 /**
996  * pbus_size_mem() - size the memory window of a given bus
997  *
998  * @bus : the bus
999  * @mask: mask the resource flag, then compare it with type
1000  * @type: the type of free resource from bridge
1001  * @type2: second match type
1002  * @type3: third match type
1003  * @min_size : the minimum memory window that must to be allocated
1004  * @add_size : additional optional memory window
1005  * @realloc_head : track the additional memory window on this list
1006  *
1007  * Calculate the size of the bus and minimal alignment which
1008  * guarantees that all child resources fit in this size.
1009  *
1010  * Returns -ENOSPC if there's no available bus resource of the desired type.
1011  * Otherwise, sets the bus resource start/end to indicate the required
1012  * size, adds things to realloc_head (if supplied), and returns 0.
1013  */
1014 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
1015                          unsigned long type, unsigned long type2,
1016                          unsigned long type3,
1017                          resource_size_t min_size, resource_size_t add_size,
1018                          struct list_head *realloc_head)
1019 {
1020         struct pci_dev *dev;
1021         resource_size_t min_align, align, size, size0, size1;
1022         resource_size_t aligns[18];     /* Alignments from 1Mb to 128Gb */
1023         int order, max_order;
1024         struct resource *b_res = find_free_bus_resource(bus,
1025                                         mask | IORESOURCE_PREFETCH, type);
1026         resource_size_t children_add_size = 0;
1027         resource_size_t children_add_align = 0;
1028         resource_size_t add_align = 0;
1029
1030         if (!b_res)
1031                 return -ENOSPC;
1032
1033         memset(aligns, 0, sizeof(aligns));
1034         max_order = 0;
1035         size = 0;
1036
1037         list_for_each_entry(dev, &bus->devices, bus_list) {
1038                 int i;
1039
1040                 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1041                         struct resource *r = &dev->resource[i];
1042                         resource_size_t r_size;
1043
1044                         if (r->parent || (r->flags & IORESOURCE_PCI_FIXED) ||
1045                             ((r->flags & mask) != type &&
1046                              (r->flags & mask) != type2 &&
1047                              (r->flags & mask) != type3))
1048                                 continue;
1049                         r_size = resource_size(r);
1050 #ifdef CONFIG_PCI_IOV
1051                         /* put SRIOV requested res to the optional list */
1052                         if (realloc_head && i >= PCI_IOV_RESOURCES &&
1053                                         i <= PCI_IOV_RESOURCE_END) {
1054                                 add_align = max(pci_resource_alignment(dev, r), add_align);
1055                                 r->end = r->start - 1;
1056                                 add_to_list(realloc_head, dev, r, r_size, 0/* don't care */);
1057                                 children_add_size += r_size;
1058                                 continue;
1059                         }
1060 #endif
1061                         /*
1062                          * aligns[0] is for 1MB (since bridge memory
1063                          * windows are always at least 1MB aligned), so
1064                          * keep "order" from being negative for smaller
1065                          * resources.
1066                          */
1067                         align = pci_resource_alignment(dev, r);
1068                         order = __ffs(align) - 20;
1069                         if (order < 0)
1070                                 order = 0;
1071                         if (order >= ARRAY_SIZE(aligns)) {
1072                                 dev_warn(&dev->dev, "disabling BAR %d: %pR (bad alignment %#llx)\n",
1073                                          i, r, (unsigned long long) align);
1074                                 r->flags = 0;
1075                                 continue;
1076                         }
1077                         size += r_size;
1078                         /* Exclude ranges with size > align from
1079                            calculation of the alignment. */
1080                         if (r_size == align)
1081                                 aligns[order] += align;
1082                         if (order > max_order)
1083                                 max_order = order;
1084
1085                         if (realloc_head) {
1086                                 children_add_size += get_res_add_size(realloc_head, r);
1087                                 children_add_align = get_res_add_align(realloc_head, r);
1088                                 add_align = max(add_align, children_add_align);
1089                         }
1090                 }
1091         }
1092
1093         min_align = calculate_mem_align(aligns, max_order);
1094         min_align = max(min_align, window_alignment(bus, b_res->flags));
1095         size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
1096         add_align = max(min_align, add_align);
1097         if (children_add_size > add_size)
1098                 add_size = children_add_size;
1099         size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
1100                 calculate_memsize(size, min_size, add_size,
1101                                 resource_size(b_res), add_align);
1102         if (!size0 && !size1) {
1103                 if (b_res->start || b_res->end)
1104                         dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
1105                                  b_res, &bus->busn_res);
1106                 b_res->flags = 0;
1107                 return 0;
1108         }
1109         b_res->start = min_align;
1110         b_res->end = size0 + min_align - 1;
1111         b_res->flags |= IORESOURCE_STARTALIGN;
1112         if (size1 > size0 && realloc_head) {
1113                 add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align);
1114                 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx add_align %llx\n",
1115                            b_res, &bus->busn_res,
1116                            (unsigned long long) (size1 - size0),
1117                            (unsigned long long) add_align);
1118         }
1119         return 0;
1120 }
1121
1122 unsigned long pci_cardbus_resource_alignment(struct resource *res)
1123 {
1124         if (res->flags & IORESOURCE_IO)
1125                 return pci_cardbus_io_size;
1126         if (res->flags & IORESOURCE_MEM)
1127                 return pci_cardbus_mem_size;
1128         return 0;
1129 }
1130
1131 static void pci_bus_size_cardbus(struct pci_bus *bus,
1132                         struct list_head *realloc_head)
1133 {
1134         struct pci_dev *bridge = bus->self;
1135         struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
1136         resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
1137         u16 ctrl;
1138
1139         if (b_res[0].parent)
1140                 goto handle_b_res_1;
1141         /*
1142          * Reserve some resources for CardBus.  We reserve
1143          * a fixed amount of bus space for CardBus bridges.
1144          */
1145         b_res[0].start = pci_cardbus_io_size;
1146         b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
1147         b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
1148         if (realloc_head) {
1149                 b_res[0].end -= pci_cardbus_io_size;
1150                 add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
1151                                 pci_cardbus_io_size);
1152         }
1153
1154 handle_b_res_1:
1155         if (b_res[1].parent)
1156                 goto handle_b_res_2;
1157         b_res[1].start = pci_cardbus_io_size;
1158         b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
1159         b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
1160         if (realloc_head) {
1161                 b_res[1].end -= pci_cardbus_io_size;
1162                 add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size,
1163                                  pci_cardbus_io_size);
1164         }
1165
1166 handle_b_res_2:
1167         /* MEM1 must not be pref mmio */
1168         pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1169         if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
1170                 ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
1171                 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1172                 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1173         }
1174
1175         /*
1176          * Check whether prefetchable memory is supported
1177          * by this bridge.
1178          */
1179         pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1180         if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
1181                 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
1182                 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1183                 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1184         }
1185
1186         if (b_res[2].parent)
1187                 goto handle_b_res_3;
1188         /*
1189          * If we have prefetchable memory support, allocate
1190          * two regions.  Otherwise, allocate one region of
1191          * twice the size.
1192          */
1193         if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
1194                 b_res[2].start = pci_cardbus_mem_size;
1195                 b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
1196                 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
1197                                   IORESOURCE_STARTALIGN;
1198                 if (realloc_head) {
1199                         b_res[2].end -= pci_cardbus_mem_size;
1200                         add_to_list(realloc_head, bridge, b_res+2,
1201                                  pci_cardbus_mem_size, pci_cardbus_mem_size);
1202                 }
1203
1204                 /* reduce that to half */
1205                 b_res_3_size = pci_cardbus_mem_size;
1206         }
1207
1208 handle_b_res_3:
1209         if (b_res[3].parent)
1210                 goto handle_done;
1211         b_res[3].start = pci_cardbus_mem_size;
1212         b_res[3].end = b_res[3].start + b_res_3_size - 1;
1213         b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
1214         if (realloc_head) {
1215                 b_res[3].end -= b_res_3_size;
1216                 add_to_list(realloc_head, bridge, b_res+3, b_res_3_size,
1217                                  pci_cardbus_mem_size);
1218         }
1219
1220 handle_done:
1221         ;
1222 }
1223
1224 void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
1225 {
1226         struct pci_dev *dev;
1227         unsigned long mask, prefmask, type2 = 0, type3 = 0;
1228         resource_size_t additional_mem_size = 0, additional_io_size = 0;
1229         struct resource *b_res;
1230         int ret;
1231
1232         list_for_each_entry(dev, &bus->devices, bus_list) {
1233                 struct pci_bus *b = dev->subordinate;
1234                 if (!b)
1235                         continue;
1236
1237                 switch (dev->class >> 8) {
1238                 case PCI_CLASS_BRIDGE_CARDBUS:
1239                         pci_bus_size_cardbus(b, realloc_head);
1240                         break;
1241
1242                 case PCI_CLASS_BRIDGE_PCI:
1243                 default:
1244                         __pci_bus_size_bridges(b, realloc_head);
1245                         break;
1246                 }
1247         }
1248
1249         /* The root bus? */
1250         if (pci_is_root_bus(bus))
1251                 return;
1252
1253         switch (bus->self->class >> 8) {
1254         case PCI_CLASS_BRIDGE_CARDBUS:
1255                 /* don't size cardbuses yet. */
1256                 break;
1257
1258         case PCI_CLASS_BRIDGE_PCI:
1259                 pci_bridge_check_ranges(bus);
1260                 if (bus->self->is_hotplug_bridge) {
1261                         additional_io_size  = pci_hotplug_io_size;
1262                         additional_mem_size = pci_hotplug_mem_size;
1263                 }
1264                 /* Fall through */
1265         default:
1266                 pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
1267                              additional_io_size, realloc_head);
1268
1269                 /*
1270                  * If there's a 64-bit prefetchable MMIO window, compute
1271                  * the size required to put all 64-bit prefetchable
1272                  * resources in it.
1273                  */
1274                 b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES];
1275                 mask = IORESOURCE_MEM;
1276                 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
1277                 if (b_res[2].flags & IORESOURCE_MEM_64) {
1278                         prefmask |= IORESOURCE_MEM_64;
1279                         ret = pbus_size_mem(bus, prefmask, prefmask,
1280                                   prefmask, prefmask,
1281                                   realloc_head ? 0 : additional_mem_size,
1282                                   additional_mem_size, realloc_head);
1283
1284                         /*
1285                          * If successful, all non-prefetchable resources
1286                          * and any 32-bit prefetchable resources will go in
1287                          * the non-prefetchable window.
1288                          */
1289                         if (ret == 0) {
1290                                 mask = prefmask;
1291                                 type2 = prefmask & ~IORESOURCE_MEM_64;
1292                                 type3 = prefmask & ~IORESOURCE_PREFETCH;
1293                         }
1294                 }
1295
1296                 /*
1297                  * If there is no 64-bit prefetchable window, compute the
1298                  * size required to put all prefetchable resources in the
1299                  * 32-bit prefetchable window (if there is one).
1300                  */
1301                 if (!type2) {
1302                         prefmask &= ~IORESOURCE_MEM_64;
1303                         ret = pbus_size_mem(bus, prefmask, prefmask,
1304                                          prefmask, prefmask,
1305                                          realloc_head ? 0 : additional_mem_size,
1306                                          additional_mem_size, realloc_head);
1307
1308                         /*
1309                          * If successful, only non-prefetchable resources
1310                          * will go in the non-prefetchable window.
1311                          */
1312                         if (ret == 0)
1313                                 mask = prefmask;
1314                         else
1315                                 additional_mem_size += additional_mem_size;
1316
1317                         type2 = type3 = IORESOURCE_MEM;
1318                 }
1319
1320                 /*
1321                  * Compute the size required to put everything else in the
1322                  * non-prefetchable window.  This includes:
1323                  *
1324                  *   - all non-prefetchable resources
1325                  *   - 32-bit prefetchable resources if there's a 64-bit
1326                  *     prefetchable window or no prefetchable window at all
1327                  *   - 64-bit prefetchable resources if there's no
1328                  *     prefetchable window at all
1329                  *
1330                  * Note that the strategy in __pci_assign_resource() must
1331                  * match that used here.  Specifically, we cannot put a
1332                  * 32-bit prefetchable resource in a 64-bit prefetchable
1333                  * window.
1334                  */
1335                 pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
1336                                 realloc_head ? 0 : additional_mem_size,
1337                                 additional_mem_size, realloc_head);
1338                 break;
1339         }
1340 }
1341
1342 void pci_bus_size_bridges(struct pci_bus *bus)
1343 {
1344         __pci_bus_size_bridges(bus, NULL);
1345 }
1346 EXPORT_SYMBOL(pci_bus_size_bridges);
1347
1348 static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
1349 {
1350         int i;
1351         struct resource *parent_r;
1352         unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
1353                              IORESOURCE_PREFETCH;
1354
1355         pci_bus_for_each_resource(b, parent_r, i) {
1356                 if (!parent_r)
1357                         continue;
1358
1359                 if ((r->flags & mask) == (parent_r->flags & mask) &&
1360                     resource_contains(parent_r, r))
1361                         request_resource(parent_r, r);
1362         }
1363 }
1364
1365 /*
1366  * Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they
1367  * are skipped by pbus_assign_resources_sorted().
1368  */
1369 static void pdev_assign_fixed_resources(struct pci_dev *dev)
1370 {
1371         int i;
1372
1373         for (i = 0; i <  PCI_NUM_RESOURCES; i++) {
1374                 struct pci_bus *b;
1375                 struct resource *r = &dev->resource[i];
1376
1377                 if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
1378                     !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
1379                         continue;
1380
1381                 b = dev->bus;
1382                 while (b && !r->parent) {
1383                         assign_fixed_resource_on_bus(b, r);
1384                         b = b->parent;
1385                 }
1386         }
1387 }
1388
1389 void __pci_bus_assign_resources(const struct pci_bus *bus,
1390                                 struct list_head *realloc_head,
1391                                 struct list_head *fail_head)
1392 {
1393         struct pci_bus *b;
1394         struct pci_dev *dev;
1395
1396         pbus_assign_resources_sorted(bus, realloc_head, fail_head);
1397
1398         list_for_each_entry(dev, &bus->devices, bus_list) {
1399                 pdev_assign_fixed_resources(dev);
1400
1401                 b = dev->subordinate;
1402                 if (!b)
1403                         continue;
1404
1405                 __pci_bus_assign_resources(b, realloc_head, fail_head);
1406
1407                 switch (dev->class >> 8) {
1408                 case PCI_CLASS_BRIDGE_PCI:
1409                         if (!pci_is_enabled(dev))
1410                                 pci_setup_bridge(b);
1411                         break;
1412
1413                 case PCI_CLASS_BRIDGE_CARDBUS:
1414                         pci_setup_cardbus(b);
1415                         break;
1416
1417                 default:
1418                         dev_info(&dev->dev, "not setting up bridge for bus %04x:%02x\n",
1419                                  pci_domain_nr(b), b->number);
1420                         break;
1421                 }
1422         }
1423 }
1424
1425 void pci_bus_assign_resources(const struct pci_bus *bus)
1426 {
1427         __pci_bus_assign_resources(bus, NULL, NULL);
1428 }
1429 EXPORT_SYMBOL(pci_bus_assign_resources);
1430
1431 static void pci_claim_device_resources(struct pci_dev *dev)
1432 {
1433         int i;
1434
1435         for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
1436                 struct resource *r = &dev->resource[i];
1437
1438                 if (!r->flags || r->parent)
1439                         continue;
1440
1441                 pci_claim_resource(dev, i);
1442         }
1443 }
1444
1445 static void pci_claim_bridge_resources(struct pci_dev *dev)
1446 {
1447         int i;
1448
1449         for (i = PCI_BRIDGE_RESOURCES; i < PCI_NUM_RESOURCES; i++) {
1450                 struct resource *r = &dev->resource[i];
1451
1452                 if (!r->flags || r->parent)
1453                         continue;
1454
1455                 pci_claim_bridge_resource(dev, i);
1456         }
1457 }
1458
1459 static void pci_bus_allocate_dev_resources(struct pci_bus *b)
1460 {
1461         struct pci_dev *dev;
1462         struct pci_bus *child;
1463
1464         list_for_each_entry(dev, &b->devices, bus_list) {
1465                 pci_claim_device_resources(dev);
1466
1467                 child = dev->subordinate;
1468                 if (child)
1469                         pci_bus_allocate_dev_resources(child);
1470         }
1471 }
1472
1473 static void pci_bus_allocate_resources(struct pci_bus *b)
1474 {
1475         struct pci_bus *child;
1476
1477         /*
1478          * Carry out a depth-first search on the PCI bus
1479          * tree to allocate bridge apertures. Read the
1480          * programmed bridge bases and recursively claim
1481          * the respective bridge resources.
1482          */
1483         if (b->self) {
1484                 pci_read_bridge_bases(b);
1485                 pci_claim_bridge_resources(b->self);
1486         }
1487
1488         list_for_each_entry(child, &b->children, node)
1489                 pci_bus_allocate_resources(child);
1490 }
1491
1492 void pci_bus_claim_resources(struct pci_bus *b)
1493 {
1494         pci_bus_allocate_resources(b);
1495         pci_bus_allocate_dev_resources(b);
1496 }
1497 EXPORT_SYMBOL(pci_bus_claim_resources);
1498
1499 static void __pci_bridge_assign_resources(const struct pci_dev *bridge,
1500                                           struct list_head *add_head,
1501                                           struct list_head *fail_head)
1502 {
1503         struct pci_bus *b;
1504
1505         pdev_assign_resources_sorted((struct pci_dev *)bridge,
1506                                          add_head, fail_head);
1507
1508         b = bridge->subordinate;
1509         if (!b)
1510                 return;
1511
1512         __pci_bus_assign_resources(b, add_head, fail_head);
1513
1514         switch (bridge->class >> 8) {
1515         case PCI_CLASS_BRIDGE_PCI:
1516                 pci_setup_bridge(b);
1517                 break;
1518
1519         case PCI_CLASS_BRIDGE_CARDBUS:
1520                 pci_setup_cardbus(b);
1521                 break;
1522
1523         default:
1524                 dev_info(&bridge->dev, "not setting up bridge for bus %04x:%02x\n",
1525                          pci_domain_nr(b), b->number);
1526                 break;
1527         }
1528 }
1529 static void pci_bridge_release_resources(struct pci_bus *bus,
1530                                           unsigned long type)
1531 {
1532         struct pci_dev *dev = bus->self;
1533         struct resource *r;
1534         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1535                                   IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1536         unsigned old_flags = 0;
1537         struct resource *b_res;
1538         int idx = 1;
1539
1540         b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
1541
1542         /*
1543          *     1. if there is io port assign fail, will release bridge
1544          *        io port.
1545          *     2. if there is non pref mmio assign fail, release bridge
1546          *        nonpref mmio.
1547          *     3. if there is 64bit pref mmio assign fail, and bridge pref
1548          *        is 64bit, release bridge pref mmio.
1549          *     4. if there is pref mmio assign fail, and bridge pref is
1550          *        32bit mmio, release bridge pref mmio
1551          *     5. if there is pref mmio assign fail, and bridge pref is not
1552          *        assigned, release bridge nonpref mmio.
1553          */
1554         if (type & IORESOURCE_IO)
1555                 idx = 0;
1556         else if (!(type & IORESOURCE_PREFETCH))
1557                 idx = 1;
1558         else if ((type & IORESOURCE_MEM_64) &&
1559                  (b_res[2].flags & IORESOURCE_MEM_64))
1560                 idx = 2;
1561         else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
1562                  (b_res[2].flags & IORESOURCE_PREFETCH))
1563                 idx = 2;
1564         else
1565                 idx = 1;
1566
1567         r = &b_res[idx];
1568
1569         if (!r->parent)
1570                 return;
1571
1572         /*
1573          * if there are children under that, we should release them
1574          *  all
1575          */
1576         release_child_resources(r);
1577         if (!release_resource(r)) {
1578                 type = old_flags = r->flags & type_mask;
1579                 dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n",
1580                                         PCI_BRIDGE_RESOURCES + idx, r);
1581                 /* keep the old size */
1582                 r->end = resource_size(r) - 1;
1583                 r->start = 0;
1584                 r->flags = 0;
1585
1586                 /* avoiding touch the one without PREF */
1587                 if (type & IORESOURCE_PREFETCH)
1588                         type = IORESOURCE_PREFETCH;
1589                 __pci_setup_bridge(bus, type);
1590                 /* for next child res under same bridge */
1591                 r->flags = old_flags;
1592         }
1593 }
1594
1595 enum release_type {
1596         leaf_only,
1597         whole_subtree,
1598 };
1599 /*
1600  * try to release pci bridge resources that is from leaf bridge,
1601  * so we can allocate big new one later
1602  */
1603 static void pci_bus_release_bridge_resources(struct pci_bus *bus,
1604                                              unsigned long type,
1605                                              enum release_type rel_type)
1606 {
1607         struct pci_dev *dev;
1608         bool is_leaf_bridge = true;
1609
1610         list_for_each_entry(dev, &bus->devices, bus_list) {
1611                 struct pci_bus *b = dev->subordinate;
1612                 if (!b)
1613                         continue;
1614
1615                 is_leaf_bridge = false;
1616
1617                 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1618                         continue;
1619
1620                 if (rel_type == whole_subtree)
1621                         pci_bus_release_bridge_resources(b, type,
1622                                                  whole_subtree);
1623         }
1624
1625         if (pci_is_root_bus(bus))
1626                 return;
1627
1628         if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1629                 return;
1630
1631         if ((rel_type == whole_subtree) || is_leaf_bridge)
1632                 pci_bridge_release_resources(bus, type);
1633 }
1634
1635 static void pci_bus_dump_res(struct pci_bus *bus)
1636 {
1637         struct resource *res;
1638         int i;
1639
1640         pci_bus_for_each_resource(bus, res, i) {
1641                 if (!res || !res->end || !res->flags)
1642                         continue;
1643
1644                 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
1645         }
1646 }
1647
1648 static void pci_bus_dump_resources(struct pci_bus *bus)
1649 {
1650         struct pci_bus *b;
1651         struct pci_dev *dev;
1652
1653
1654         pci_bus_dump_res(bus);
1655
1656         list_for_each_entry(dev, &bus->devices, bus_list) {
1657                 b = dev->subordinate;
1658                 if (!b)
1659                         continue;
1660
1661                 pci_bus_dump_resources(b);
1662         }
1663 }
1664
1665 static int pci_bus_get_depth(struct pci_bus *bus)
1666 {
1667         int depth = 0;
1668         struct pci_bus *child_bus;
1669
1670         list_for_each_entry(child_bus, &bus->children, node) {
1671                 int ret;
1672
1673                 ret = pci_bus_get_depth(child_bus);
1674                 if (ret + 1 > depth)
1675                         depth = ret + 1;
1676         }
1677
1678         return depth;
1679 }
1680
1681 /*
1682  * -1: undefined, will auto detect later
1683  *  0: disabled by user
1684  *  1: disabled by auto detect
1685  *  2: enabled by user
1686  *  3: enabled by auto detect
1687  */
1688 enum enable_type {
1689         undefined = -1,
1690         user_disabled,
1691         auto_disabled,
1692         user_enabled,
1693         auto_enabled,
1694 };
1695
1696 static enum enable_type pci_realloc_enable = undefined;
1697 void __init pci_realloc_get_opt(char *str)
1698 {
1699         if (!strncmp(str, "off", 3))
1700                 pci_realloc_enable = user_disabled;
1701         else if (!strncmp(str, "on", 2))
1702                 pci_realloc_enable = user_enabled;
1703 }
1704 static bool pci_realloc_enabled(enum enable_type enable)
1705 {
1706         return enable >= user_enabled;
1707 }
1708
1709 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
1710 static int iov_resources_unassigned(struct pci_dev *dev, void *data)
1711 {
1712         int i;
1713         bool *unassigned = data;
1714
1715         for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
1716                 struct resource *r = &dev->resource[i];
1717                 struct pci_bus_region region;
1718
1719                 /* Not assigned or rejected by kernel? */
1720                 if (!r->flags)
1721                         continue;
1722
1723                 pcibios_resource_to_bus(dev->bus, &region, r);
1724                 if (!region.start) {
1725                         *unassigned = true;
1726                         return 1; /* return early from pci_walk_bus() */
1727                 }
1728         }
1729
1730         return 0;
1731 }
1732
1733 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
1734                          enum enable_type enable_local)
1735 {
1736         bool unassigned = false;
1737
1738         if (enable_local != undefined)
1739                 return enable_local;
1740
1741         pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
1742         if (unassigned)
1743                 return auto_enabled;
1744
1745         return enable_local;
1746 }
1747 #else
1748 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
1749                          enum enable_type enable_local)
1750 {
1751         return enable_local;
1752 }
1753 #endif
1754
1755 /*
1756  * first try will not touch pci bridge res
1757  * second and later try will clear small leaf bridge res
1758  * will stop till to the max depth if can not find good one
1759  */
1760 void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
1761 {
1762         LIST_HEAD(realloc_head); /* list of resources that
1763                                         want additional resources */
1764         struct list_head *add_list = NULL;
1765         int tried_times = 0;
1766         enum release_type rel_type = leaf_only;
1767         LIST_HEAD(fail_head);
1768         struct pci_dev_resource *fail_res;
1769         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1770                                   IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1771         int pci_try_num = 1;
1772         enum enable_type enable_local;
1773
1774         /* don't realloc if asked to do so */
1775         enable_local = pci_realloc_detect(bus, pci_realloc_enable);
1776         if (pci_realloc_enabled(enable_local)) {
1777                 int max_depth = pci_bus_get_depth(bus);
1778
1779                 pci_try_num = max_depth + 1;
1780                 dev_printk(KERN_DEBUG, &bus->dev,
1781                            "max bus depth: %d pci_try_num: %d\n",
1782                            max_depth, pci_try_num);
1783         }
1784
1785 again:
1786         /*
1787          * last try will use add_list, otherwise will try good to have as
1788          * must have, so can realloc parent bridge resource
1789          */
1790         if (tried_times + 1 == pci_try_num)
1791                 add_list = &realloc_head;
1792         /* Depth first, calculate sizes and alignments of all
1793            subordinate buses. */
1794         __pci_bus_size_bridges(bus, add_list);
1795
1796         /* Depth last, allocate resources and update the hardware. */
1797         __pci_bus_assign_resources(bus, add_list, &fail_head);
1798         if (add_list)
1799                 BUG_ON(!list_empty(add_list));
1800         tried_times++;
1801
1802         /* any device complain? */
1803         if (list_empty(&fail_head))
1804                 goto dump;
1805
1806         if (tried_times >= pci_try_num) {
1807                 if (enable_local == undefined)
1808                         dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n");
1809                 else if (enable_local == auto_enabled)
1810                         dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
1811
1812                 free_list(&fail_head);
1813                 goto dump;
1814         }
1815
1816         dev_printk(KERN_DEBUG, &bus->dev,
1817                    "No. %d try to assign unassigned res\n", tried_times + 1);
1818
1819         /* third times and later will not check if it is leaf */
1820         if ((tried_times + 1) > 2)
1821                 rel_type = whole_subtree;
1822
1823         /*
1824          * Try to release leaf bridge's resources that doesn't fit resource of
1825          * child device under that bridge
1826          */
1827         list_for_each_entry(fail_res, &fail_head, list)
1828                 pci_bus_release_bridge_resources(fail_res->dev->bus,
1829                                                  fail_res->flags & type_mask,
1830                                                  rel_type);
1831
1832         /* restore size and flags */
1833         list_for_each_entry(fail_res, &fail_head, list) {
1834                 struct resource *res = fail_res->res;
1835
1836                 res->start = fail_res->start;
1837                 res->end = fail_res->end;
1838                 res->flags = fail_res->flags;
1839                 if (fail_res->dev->subordinate)
1840                         res->flags = 0;
1841         }
1842         free_list(&fail_head);
1843
1844         goto again;
1845
1846 dump:
1847         /* dump the resource on buses */
1848         pci_bus_dump_resources(bus);
1849 }
1850
1851 void __init pci_assign_unassigned_resources(void)
1852 {
1853         struct pci_bus *root_bus;
1854
1855         list_for_each_entry(root_bus, &pci_root_buses, node)
1856                 pci_assign_unassigned_root_bus_resources(root_bus);
1857 }
1858
1859 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
1860 {
1861         struct pci_bus *parent = bridge->subordinate;
1862         LIST_HEAD(add_list); /* list of resources that
1863                                         want additional resources */
1864         int tried_times = 0;
1865         LIST_HEAD(fail_head);
1866         struct pci_dev_resource *fail_res;
1867         int retval;
1868         unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1869                                   IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1870
1871 again:
1872         __pci_bus_size_bridges(parent, &add_list);
1873         __pci_bridge_assign_resources(bridge, &add_list, &fail_head);
1874         BUG_ON(!list_empty(&add_list));
1875         tried_times++;
1876
1877         if (list_empty(&fail_head))
1878                 goto enable_all;
1879
1880         if (tried_times >= 2) {
1881                 /* still fail, don't need to try more */
1882                 free_list(&fail_head);
1883                 goto enable_all;
1884         }
1885
1886         printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1887                          tried_times + 1);
1888
1889         /*
1890          * Try to release leaf bridge's resources that doesn't fit resource of
1891          * child device under that bridge
1892          */
1893         list_for_each_entry(fail_res, &fail_head, list)
1894                 pci_bus_release_bridge_resources(fail_res->dev->bus,
1895                                                  fail_res->flags & type_mask,
1896                                                  whole_subtree);
1897
1898         /* restore size and flags */
1899         list_for_each_entry(fail_res, &fail_head, list) {
1900                 struct resource *res = fail_res->res;
1901
1902                 res->start = fail_res->start;
1903                 res->end = fail_res->end;
1904                 res->flags = fail_res->flags;
1905                 if (fail_res->dev->subordinate)
1906                         res->flags = 0;
1907         }
1908         free_list(&fail_head);
1909
1910         goto again;
1911
1912 enable_all:
1913         retval = pci_reenable_device(bridge);
1914         if (retval)
1915                 dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval);
1916         pci_set_master(bridge);
1917 }
1918 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
1919
1920 void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
1921 {
1922         struct pci_dev *dev;
1923         LIST_HEAD(add_list); /* list of resources that
1924                                         want additional resources */
1925
1926         down_read(&pci_bus_sem);
1927         list_for_each_entry(dev, &bus->devices, bus_list)
1928                 if (pci_is_bridge(dev) && pci_has_subordinate(dev))
1929                                 __pci_bus_size_bridges(dev->subordinate,
1930                                                          &add_list);
1931         up_read(&pci_bus_sem);
1932         __pci_bus_assign_resources(bus, &add_list, NULL);
1933         BUG_ON(!list_empty(&add_list));
1934 }
1935 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bus_resources);