Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci

[cascardo/linux.git] / arch / x86 / kernel / amd_nb.c

diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index 013c181..be16854 100644 (file)
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -119,6 +119,37 @@ bool __init early_is_amd_nb(u32 device)
        return false;
 }
 
+struct resource *amd_get_mmconfig_range(struct resource *res)
+{
+       u32 address;
+       u64 base, msr;
+       unsigned segn_busn_bits;
+
+       if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+               return NULL;
+
+       /* assume all cpus from fam10h have mmconfig */
+        if (boot_cpu_data.x86 < 0x10)
+               return NULL;
+
+       address = MSR_FAM10H_MMIO_CONF_BASE;
+       rdmsrl(address, msr);
+
+       /* mmconfig is not enabled */
+       if (!(msr & FAM10H_MMIO_CONF_ENABLE))
+               return NULL;
+
+       base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
+
+       segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
+                        FAM10H_MMIO_CONF_BUSRANGE_MASK;
+
+       res->flags = IORESOURCE_MEM;
+       res->start = base;
+       res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
+       return res;
+}
+
 int amd_get_subcaches(int cpu)
 {
        struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;