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authorAaron Durbin <adurbin@google.com>2007-07-21 17:10:34 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 18:37:10 -0700
commita5ba7971045a90a36cef8f7d5a3075600b475b74 (patch)
tree5a2cc7b4c818a36fec1c844903114142fdfd88bb /arch/i386
parent08705b89ecb0f4b0ba5735630ef988bd9fd9dd95 (diff)
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>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/pci/mmconfig-shared.c48
1 files changed, 45 insertions, 3 deletions
diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index c7cabeed4d7..4df637e34f8 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -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);