blob: a19ed92e74e4bde4bf058d822513e1b5c97c0fdd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Low-Level PCI Access for i386 machines
3 *
4 * Copyright 1993, 1994 Drew Eckhardt
5 * Visionary Computing
6 * (Unix and Linux consulting and custom programming)
7 * Drew@Colorado.EDU
8 * +1 (303) 786-7975
9 *
10 * Drew's work was sponsored by:
11 * iX Multiuser Multitasking Magazine
12 * Hannover, Germany
13 * hm@ix.de
14 *
15 * Copyright 1997--2000 Martin Mares <mj@ucw.cz>
16 *
17 * For more information, please consult the following manuals (look at
18 * http://www.pcisig.com/ for how to get them):
19 *
20 * PCI BIOS Specification
21 * PCI Local Bus Specification
22 * PCI to PCI Bridge Specification
23 * PCI System Design Guide
24 *
25 */
26
27#include <linux/types.h>
28#include <linux/kernel.h>
Paul Gortmaker69c60c82011-05-26 12:22:53 -040029#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/pci.h>
31#include <linux/init.h>
32#include <linux/ioport.h>
33#include <linux/errno.h>
venkatesh.pallipadi@intel.com03d72aa2008-03-18 17:00:19 -070034#include <linux/bootmem.h>
35
36#include <asm/pat.h>
Yinghai Lu58f7c982008-08-28 13:52:25 -070037#include <asm/e820.h>
Jaswinder Singh Rajput82487712008-12-27 18:32:28 +053038#include <asm/pci_x86.h>
Yinghai Lu857fdc52009-07-10 09:36:20 -070039#include <asm/io_apic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Myron Stowe925845b2011-11-21 11:54:13 -070042/*
43 * This list of dynamic mappings is for temporarily maintaining
44 * original BIOS BAR addresses for possible reinstatement.
45 */
46struct pcibios_fwaddrmap {
47 struct list_head list;
48 struct pci_dev *dev;
49 resource_size_t fw_addr[DEVICE_COUNT_RESOURCE];
50};
51
52static LIST_HEAD(pcibios_fwaddrmappings);
53static DEFINE_SPINLOCK(pcibios_fwaddrmap_lock);
Yinghai Lu74521602012-11-03 21:39:28 -070054static bool pcibios_fw_addr_done;
Myron Stowe925845b2011-11-21 11:54:13 -070055
56/* Must be called with 'pcibios_fwaddrmap_lock' lock held. */
57static struct pcibios_fwaddrmap *pcibios_fwaddrmap_lookup(struct pci_dev *dev)
58{
59 struct pcibios_fwaddrmap *map;
60
Bjorn Helgaas867aae62012-05-15 17:01:09 -060061 WARN_ON_SMP(!spin_is_locked(&pcibios_fwaddrmap_lock));
Myron Stowe63ab387c2012-03-02 12:45:01 -070062
Myron Stowe925845b2011-11-21 11:54:13 -070063 list_for_each_entry(map, &pcibios_fwaddrmappings, list)
64 if (map->dev == dev)
65 return map;
66
67 return NULL;
68}
69
70static void
71pcibios_save_fw_addr(struct pci_dev *dev, int idx, resource_size_t fw_addr)
72{
73 unsigned long flags;
74 struct pcibios_fwaddrmap *map;
75
Yinghai Lu74521602012-11-03 21:39:28 -070076 if (pcibios_fw_addr_done)
77 return;
78
Myron Stowe925845b2011-11-21 11:54:13 -070079 spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
80 map = pcibios_fwaddrmap_lookup(dev);
81 if (!map) {
82 spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
83 map = kzalloc(sizeof(*map), GFP_KERNEL);
84 if (!map)
85 return;
86
87 map->dev = pci_dev_get(dev);
88 map->fw_addr[idx] = fw_addr;
89 INIT_LIST_HEAD(&map->list);
90
91 spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
92 list_add_tail(&map->list, &pcibios_fwaddrmappings);
93 } else
94 map->fw_addr[idx] = fw_addr;
95 spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
96}
97
98resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
99{
100 unsigned long flags;
101 struct pcibios_fwaddrmap *map;
102 resource_size_t fw_addr = 0;
103
Yinghai Lu74521602012-11-03 21:39:28 -0700104 if (pcibios_fw_addr_done)
105 return 0;
106
Myron Stowe925845b2011-11-21 11:54:13 -0700107 spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
108 map = pcibios_fwaddrmap_lookup(dev);
109 if (map)
110 fw_addr = map->fw_addr[idx];
111 spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
112
113 return fw_addr;
114}
115
Yinghai Lu74521602012-11-03 21:39:28 -0700116static void __init pcibios_fw_addr_list_del(void)
Myron Stowe925845b2011-11-21 11:54:13 -0700117{
118 unsigned long flags;
119 struct pcibios_fwaddrmap *entry, *next;
120
121 spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
122 list_for_each_entry_safe(entry, next, &pcibios_fwaddrmappings, list) {
123 list_del(&entry->list);
124 pci_dev_put(entry->dev);
125 kfree(entry);
126 }
127 spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
Yinghai Lu74521602012-11-03 21:39:28 -0700128 pcibios_fw_addr_done = true;
Myron Stowe925845b2011-11-21 11:54:13 -0700129}
130
Gary Hade036fff42007-10-03 15:56:14 -0700131static int
132skip_isa_ioresource_align(struct pci_dev *dev) {
133
134 if ((pci_probe & PCI_CAN_SKIP_ISA_ALIGN) &&
Gary Hade11949252007-10-08 16:24:16 -0700135 !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
Gary Hade036fff42007-10-03 15:56:14 -0700136 return 1;
137 return 0;
138}
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140/*
141 * We need to avoid collisions with `mirrored' VGA ports
142 * and other strange ISA hardware, so we always want the
143 * addresses to be allocated in the 0x000-0x0ff region
144 * modulo 0x400.
145 *
146 * Why? Because some silly external IO cards only decode
147 * the low 10 bits of the IO address. The 0x00-0xff region
148 * is reserved for motherboard devices that decode all 16
149 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
150 * but we want to try to avoid allocating at 0x2900-0x2bff
151 * which might have be mirrored at 0x0100-0x03ff..
152 */
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100153resource_size_t
Dominik Brodowski3b7a17f2010-01-01 17:40:50 +0100154pcibios_align_resource(void *data, const struct resource *res,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700155 resource_size_t size, resource_size_t align)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Gary Hade036fff42007-10-03 15:56:14 -0700157 struct pci_dev *dev = data;
Bjorn Helgaasd14125e2010-12-16 10:38:31 -0700158 resource_size_t start = res->start;
Gary Hade036fff42007-10-03 15:56:14 -0700159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (res->flags & IORESOURCE_IO) {
Bjorn Helgaasd14125e2010-12-16 10:38:31 -0700161 if (skip_isa_ioresource_align(dev))
162 return start;
163 if (start & 0x300)
164 start = (start + 0x3ff) & ~0x3ff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100166 return start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
Dave Airlie6c00a612007-10-29 18:06:10 +1000168EXPORT_SYMBOL(pcibios_align_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170/*
171 * Handle resources of PCI devices. If the world were perfect, we could
172 * just allocate all the resource regions and do nothing more. It isn't.
173 * On the other hand, we cannot just re-allocate all devices, as it would
174 * require us to know lots of host bridge internals. So we attempt to
175 * keep as much of the original configuration as possible, but tweak it
176 * when it's found to be wrong.
177 *
178 * Known BIOS problems we have to work around:
179 * - I/O or memory regions not configured
180 * - regions configured, but not enabled in the command register
181 * - bogus I/O addresses above 64K used
182 * - expansion ROMs left enabled (this may sound harmless, but given
183 * the fact the PCI specs explicitly allow address decoders to be
184 * shared between expansion ROMs and other resource regions, it's
185 * at least dangerous)
Yinghai Lu837c4ef2010-06-03 13:43:03 -0700186 * - bad resource sizes or overlaps with other regions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 *
188 * Our solution:
189 * (1) Allocate resources for all buses behind PCI-to-PCI bridges.
190 * This gives us fixed barriers on where we can allocate.
191 * (2) Allocate resources for all enabled devices. If there is
192 * a collision, just mark the resource as unallocated. Also
193 * disable expansion ROMs during this step.
194 * (3) Try to allocate resources for disabled devices. If the
195 * resources were assigned correctly, everything goes well,
196 * if they weren't, they won't disturb allocation of other
197 * resources.
198 * (4) Assign new addresses to resources which were either
199 * not configured at all or misconfigured. If explicitly
200 * requested by the user, configure expansion ROM address
201 * as well.
202 */
203
Yinghai Lub95168e2012-11-03 21:39:29 -0700204static void pcibios_allocate_bridge_resources(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 int idx;
Matthew Wilcoxa76117d2009-06-17 16:33:35 -0400207 struct resource *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Yinghai Luf7ac3562012-11-03 21:39:24 -0700209 for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
210 r = &dev->resource[idx];
211 if (!r->flags)
212 continue;
Mika Westerbergc70d6502013-07-03 17:04:48 +0300213 if (r->parent) /* Already allocated */
214 continue;
Yinghai Luf7ac3562012-11-03 21:39:24 -0700215 if (!r->start || pci_claim_resource(dev, idx) < 0) {
216 /*
217 * Something is wrong with the region.
218 * Invalidate the resource to prevent
219 * child resource allocations in this
220 * range.
221 */
222 r->start = r->end = 0;
223 r->flags = 0;
224 }
225 }
226}
227
Yinghai Lub95168e2012-11-03 21:39:29 -0700228static void pcibios_allocate_bus_resources(struct pci_bus *bus)
Yinghai Luf7ac3562012-11-03 21:39:24 -0700229{
Yinghai Lu83edc872012-11-03 21:39:26 -0700230 struct pci_bus *child;
Yinghai Luf7ac3562012-11-03 21:39:24 -0700231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 /* Depth-First Search on bus tree */
Yinghai Lu83edc872012-11-03 21:39:26 -0700233 if (bus->self)
234 pcibios_allocate_bridge_resources(bus->self);
235 list_for_each_entry(child, &bus->children, node)
236 pcibios_allocate_bus_resources(child);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
Yinghai Lu575939c2009-11-24 18:05:12 -0800239struct pci_check_idx_range {
240 int start;
241 int end;
242};
243
Yinghai Lub95168e2012-11-03 21:39:29 -0700244static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
Yinghai Lu575939c2009-11-24 18:05:12 -0800246 int idx, disabled, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 u16 command;
Matthew Wilcoxa76117d2009-06-17 16:33:35 -0400248 struct resource *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Yinghai Lu575939c2009-11-24 18:05:12 -0800250 struct pci_check_idx_range idx_range[] = {
251 { PCI_STD_RESOURCES, PCI_STD_RESOURCE_END },
252#ifdef CONFIG_PCI_IOV
253 { PCI_IOV_RESOURCES, PCI_IOV_RESOURCE_END },
254#endif
255 };
256
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700257 pci_read_config_word(dev, PCI_COMMAND, &command);
258 for (i = 0; i < ARRAY_SIZE(idx_range); i++)
Yinghai Lu575939c2009-11-24 18:05:12 -0800259 for (idx = idx_range[i].start; idx <= idx_range[i].end; idx++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 r = &dev->resource[idx];
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700261 if (r->parent) /* Already allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 continue;
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700263 if (!r->start) /* Address not assigned at all */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 continue;
265 if (r->flags & IORESOURCE_IO)
266 disabled = !(command & PCI_COMMAND_IO);
267 else
268 disabled = !(command & PCI_COMMAND_MEMORY);
269 if (pass == disabled) {
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600270 dev_dbg(&dev->dev,
Bjorn Helgaas865df572009-11-04 10:32:57 -0700271 "BAR %d: reserving %pr (d=%d, p=%d)\n",
Bjorn Helgaasc7dabef2009-10-27 13:26:47 -0600272 idx, r, disabled, pass);
Matthew Wilcoxa76117d2009-06-17 16:33:35 -0400273 if (pci_claim_resource(dev, idx) < 0) {
Bjorn Helgaas4e4ba942014-04-14 15:30:09 -0600274 if (r->flags & IORESOURCE_PCI_FIXED) {
275 dev_info(&dev->dev, "BAR %d %pR is immovable\n",
276 idx, r);
277 } else {
278 /* We'll assign a new address later */
279 pcibios_save_fw_addr(dev,
280 idx, r->start);
281 r->end -= r->start;
282 r->start = 0;
283 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 }
285 }
286 }
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700287 if (!pass) {
288 r = &dev->resource[PCI_ROM_RESOURCE];
289 if (r->flags & IORESOURCE_ROM_ENABLE) {
290 /* Turn the ROM off, leave the resource region,
291 * but keep it unregistered. */
292 u32 reg;
293 dev_dbg(&dev->dev, "disabling ROM %pR\n", r);
294 r->flags &= ~IORESOURCE_ROM_ENABLE;
295 pci_read_config_dword(dev, dev->rom_base_reg, &reg);
296 pci_write_config_dword(dev, dev->rom_base_reg,
Randy Dunlap7edab2f2006-10-17 10:17:58 -0700297 reg & ~PCI_ROM_ADDRESS_ENABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 }
299 }
300}
301
Yinghai Lub95168e2012-11-03 21:39:29 -0700302static void pcibios_allocate_resources(struct pci_bus *bus, int pass)
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700303{
Yinghai Lu83edc872012-11-03 21:39:26 -0700304 struct pci_dev *dev;
305 struct pci_bus *child;
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700306
Yinghai Lu83edc872012-11-03 21:39:26 -0700307 list_for_each_entry(dev, &bus->devices, bus_list) {
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700308 pcibios_allocate_dev_resources(dev, pass);
Yinghai Lu83edc872012-11-03 21:39:26 -0700309
310 child = dev->subordinate;
311 if (child)
312 pcibios_allocate_resources(child, pass);
313 }
Yinghai Luc7f4bbc2012-11-03 21:39:25 -0700314}
315
Yinghai Lub95168e2012-11-03 21:39:29 -0700316static void pcibios_allocate_dev_rom_resource(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Matthew Wilcoxa76117d2009-06-17 16:33:35 -0400318 struct resource *r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Yinghai Ludc2f56f2012-11-03 21:39:27 -0700320 /*
321 * Try to use BIOS settings for ROMs, otherwise let
322 * pci_assign_unassigned_resources() allocate the new
323 * addresses.
324 */
325 r = &dev->resource[PCI_ROM_RESOURCE];
326 if (!r->flags || !r->start)
327 return;
Mika Westerbergc70d6502013-07-03 17:04:48 +0300328 if (r->parent) /* Already allocated */
329 return;
Yinghai Ludc2f56f2012-11-03 21:39:27 -0700330
331 if (pci_claim_resource(dev, PCI_ROM_RESOURCE) < 0) {
332 r->end -= r->start;
333 r->start = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 }
Yinghai Ludc2f56f2012-11-03 21:39:27 -0700335}
Yinghai Lub95168e2012-11-03 21:39:29 -0700336static void pcibios_allocate_rom_resources(struct pci_bus *bus)
Yinghai Ludc2f56f2012-11-03 21:39:27 -0700337{
338 struct pci_dev *dev;
339 struct pci_bus *child;
340
341 list_for_each_entry(dev, &bus->devices, bus_list) {
342 pcibios_allocate_dev_rom_resource(dev);
343
344 child = dev->subordinate;
345 if (child)
346 pcibios_allocate_rom_resources(child);
347 }
348}
349
350static int __init pcibios_assign_resources(void)
351{
352 struct pci_bus *bus;
353
354 if (!(pci_probe & PCI_ASSIGN_ROMS))
355 list_for_each_entry(bus, &pci_root_buses, node)
356 pcibios_allocate_rom_resources(bus);
Ivan Kokshaysky81d4af12005-08-30 18:48:52 +0400357
358 pci_assign_unassigned_resources();
Myron Stowe6535943f2011-11-21 11:54:19 -0700359 pcibios_fw_addr_list_del();
Ivan Kokshaysky81d4af12005-08-30 18:48:52 +0400360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return 0;
362}
363
Bjorn Helgaasadc429d2014-04-14 16:13:48 -0600364/**
365 * called in fs_initcall (one below subsys_initcall),
366 * give a chance for motherboard reserve resources
367 */
368fs_initcall(pcibios_assign_resources);
369
Yinghai Lub3e65e12012-11-03 21:39:30 -0700370void pcibios_resource_survey_bus(struct pci_bus *bus)
371{
372 dev_printk(KERN_DEBUG, &bus->dev, "Allocating resources\n");
373
374 pcibios_allocate_bus_resources(bus);
375
376 pcibios_allocate_resources(bus, 0);
377 pcibios_allocate_resources(bus, 1);
378
379 if (!(pci_probe & PCI_ASSIGN_ROMS))
380 pcibios_allocate_rom_resources(bus);
381}
382
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383void __init pcibios_resource_survey(void)
384{
Yinghai Lu83edc872012-11-03 21:39:26 -0700385 struct pci_bus *bus;
386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 DBG("PCI: Allocating resources\n");
Yinghai Lu83edc872012-11-03 21:39:26 -0700388
389 list_for_each_entry(bus, &pci_root_buses, node)
390 pcibios_allocate_bus_resources(bus);
391
392 list_for_each_entry(bus, &pci_root_buses, node)
393 pcibios_allocate_resources(bus, 0);
394 list_for_each_entry(bus, &pci_root_buses, node)
395 pcibios_allocate_resources(bus, 1);
Ingo Molnara5444d12008-08-29 08:09:23 +0200396
397 e820_reserve_resources_late();
Yinghai Lu857fdc52009-07-10 09:36:20 -0700398 /*
399 * Insert the IO APIC resources after PCI initialization has
Lucas De Marchi0d2eb442011-03-17 16:24:16 -0300400 * occurred to handle IO APICS that are mapped in on a BAR in
Yinghai Lu857fdc52009-07-10 09:36:20 -0700401 * PCI space, but before trying to assign unassigned pci res.
402 */
403 ioapic_insert_resources();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404}
405
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400406static const struct vm_operations_struct pci_mmap_ops = {
Rik van Riel7ae8ed52008-07-23 21:27:07 -0700407 .access = generic_access_phys,
venkatesh.pallipadi@intel.com03d72aa2008-03-18 17:00:19 -0700408};
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
411 enum pci_mmap_state mmap_state, int write_combine)
412{
413 unsigned long prot;
414
415 /* I/O space cannot be accessed via normal processor loads and
416 * stores on this platform.
417 */
418 if (mmap_state == pci_mmap_io)
419 return -EINVAL;
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 prot = pgprot_val(vma->vm_page_prot);
Suresh Siddha2992e542009-10-26 13:21:32 -0800422
423 /*
424 * Return error if pat is not enabled and write_combine is requested.
425 * Caller can followup with UC MINUS request and add a WC mtrr if there
426 * is a free mtrr slot.
427 */
428 if (!pat_enabled && write_combine)
429 return -EINVAL;
430
Andreas Herrmann499f8f82008-06-10 16:06:21 +0200431 if (pat_enabled && write_combine)
venkatesh.pallipadi@intel.com03d72aa2008-03-18 17:00:19 -0700432 prot |= _PAGE_CACHE_WC;
Andreas Herrmann499f8f82008-06-10 16:06:21 +0200433 else if (pat_enabled || boot_cpu_data.x86 > 3)
Suresh Siddhade33c442008-04-25 17:07:22 -0700434 /*
435 * ioremap() and ioremap_nocache() defaults to UC MINUS for now.
436 * To avoid attribute conflicts, request UC MINUS here
Lucas De Marchi0d2eb442011-03-17 16:24:16 -0300437 * as well.
Suresh Siddhade33c442008-04-25 17:07:22 -0700438 */
439 prot |= _PAGE_CACHE_UC_MINUS;
venkatesh.pallipadi@intel.com03d72aa2008-03-18 17:00:19 -0700440
Jeremy Fitzhardinge5ee01f42010-03-18 14:31:30 -0400441 prot |= _PAGE_IOMAP; /* creating a mapping for IO */
442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 vma->vm_page_prot = __pgprot(prot);
444
Michael S. Tsirkin346d3882005-07-31 11:51:45 +0300445 if (io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
446 vma->vm_end - vma->vm_start,
447 vma->vm_page_prot))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 return -EAGAIN;
449
venkatesh.pallipadi@intel.com03d72aa2008-03-18 17:00:19 -0700450 vma->vm_ops = &pci_mmap_ops;
451
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 return 0;
453}