This patch addes the PCI memory mapped config region(s) to be visible in
/proc/iomem. This will allow for more visibility into the physical memory
map without having to parse the dmesg output.
Signed-off-by: Aaron Durbin <[email protected]>
---
diff --git a/arch/x86_64/pci/mmconfig.c b/arch/x86_64/pci/mmconfig.c
index 3c55c76..f95af08 100644
--- a/arch/x86_64/pci/mmconfig.c
+++ b/arch/x86_64/pci/mmconfig.c
@@ -9,6 +9,7 @@ #include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/bitmap.h>
+#include <linux/ioport.h>
#include <asm/e820.h>
#include "pci.h"
@@ -164,6 +165,37 @@ static __init void unreachable_devices(v
}
}
+static __init void pci_mmcfg_insert_resources(void)
+{
+#define PCI_MMCFG_RESOURCE_NAME_LEN 19
+ int i;
+ struct resource *res;
+ char *names;
+ unsigned n;
+
+ n = (PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res));
+ n *= pci_mmcfg_config_num;
+
+ res = kcalloc(1, n, GFP_KERNEL);
+
+ if (!res)
+ return;
+
+ names = (void *)&res[pci_mmcfg_config_num];
+ for (i = 0; i < pci_mmcfg_config_num; i++, res++) {
+ n = pci_mmcfg_config[i].end_bus_number -
+ pci_mmcfg_config[i].start_bus_number + 1;
+ res->name = names;
+ snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u",
+ pci_mmcfg_config[i].pci_segment_group_number);
+ res->start = pci_mmcfg_config[i].base_address;
+ res->end = res->start + (n << 20) - 1;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ insert_resource(&iomem_resource, res);
+ names += PCI_MMCFG_RESOURCE_NAME_LEN;
+ }
+}
+
void __init pci_mmcfg_init(void)
{
int i;
@@ -205,6 +237,7 @@ void __init pci_mmcfg_init(void)
}
unreachable_devices();
+ pci_mmcfg_insert_resources();
raw_pci_ops = &pci_mmcfg;
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
-
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