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i386: insert unclaimed MMCONFIG resources 

Insert the unclaimed MMCONFIG resources into the resource tree without the
IORESOURCE_BUSY flag during late initialization.  This allows the MMCONFIG
regions to be visible in the iomem resource tree without interfering with
other system resources that were discovered during PCI initialization.

[akpm@linux-foundation.org: nanofixes]
Signed-off-by: Aaron Durbin <adurbin@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aaron Durbin 2007-07-21 17:10:34 +02:00 committed by Linus Torvalds
parent 08705b89ec
commit a5ba797104
1 changed files with 45 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
arch/i386/pci/mmconfig-shared.c
View File

@ -24,6 +24,9 @@
DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*PCI_MMCFG_MAX_CHECK_BUS);
/* Indicate if the mmcfg resources have been placed into the resource table. */
static int __initdata pci_mmcfg_resources_inserted;
/* K8 systems have some devices (typically in the builtin northbridge)
that are only accessible using type1
Normally this can be expressed in the MCFG by not listing them
@ -170,7 +173,7 @@ static int __init pci_mmcfg_check_hostbridge(void)
return name != NULL;
}
static void __init pci_mmcfg_insert_resources(void)
static void __init pci_mmcfg_insert_resources(unsigned long resource_flags)
{
#define PCI_MMCFG_RESOURCE_NAME_LEN 19
int i;
@ -194,10 +197,13 @@ static void __init pci_mmcfg_insert_resources(void)
cfg->pci_segment);
res->start = cfg->address;
res->end = res->start + (num_buses << 20) - 1;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
res->flags = IORESOURCE_MEM | resource_flags;
insert_resource(&iomem_resource, res);
names += PCI_MMCFG_RESOURCE_NAME_LEN;
}
/* Mark that the resources have been inserted. */
pci_mmcfg_resources_inserted = 1;
}
static void __init pci_mmcfg_reject_broken(int type)
@ -267,7 +273,43 @@ void __init pci_mmcfg_init(int type)
if (type == 1)
unreachable_devices();
if (known_bridge)
pci_mmcfg_insert_resources();
pci_mmcfg_insert_resources(IORESOURCE_BUSY);
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
} else {
/*
* Signal not to attempt to insert mmcfg resources because
* the architecture mmcfg setup could not initialize.
*/
pci_mmcfg_resources_inserted = 1;
}
}
static int __init pci_mmcfg_late_insert_resources(void)
{
/*
* If resources are already inserted or we are not using MMCONFIG,
* don't insert the resources.
*/
if ((pci_mmcfg_resources_inserted == 1) ||
(pci_probe & PCI_PROBE_MMCONF) == 0 ||
(pci_mmcfg_config_num == 0) ||
(pci_mmcfg_config == NULL) ||
(pci_mmcfg_config[0].address == 0))
return 1;
/*
* Attempt to insert the mmcfg resources but not with the busy flag
* marked so it won't cause request errors when __request_region is
* called.
*/
pci_mmcfg_insert_resources(0);
return 0;
}
/*
* Perform MMCONFIG resource insertion after PCI initialization to allow for
* misprogrammed MCFG tables that state larger sizes but actually conflict
* with other system resources.
*/
late_initcall(pci_mmcfg_late_insert_resources);