[PATCH] x86_64: check and enable MMCONFIG for AMD Family 10h Opteron
Signed-off-by: Yinghai Lu <[email protected]>
Index: linux-2.6/arch/x86_64/kernel/setup.c
===================================================================
--- linux-2.6.orig/arch/x86_64/kernel/setup.c 2007-09-12 11:28:08.000000000 -0700
+++ linux-2.6/arch/x86_64/kernel/setup.c 2007-09-12 12:09:32.000000000 -0700
@@ -507,6 +507,32 @@
}
#endif
+/*[39:8] */
+/* why not using 0xfe000000 ? */
+#define FAM10H_PCI_MMIO_BASE 0xc0000000
+static void fam10h_check_enable_mmcfg(struct cpuinfo_x86 *c)
+{
+ u32 low, high, address;
+
+ address = 0xc0010058;
+ if (rdmsr_safe(address, &low, &high))
+ return;
+
+ if (low & 1)
+ return;
+
+ printk(KERN_INFO "Enable MMCONFIG on AMD Family 10h\n");
+ /*
+ * if it is not enable, let enable it and assume only one segement
+ * with 256 buses
+ */
+ low &= ~(0xfff00000 | (0xf<<2));
+ low |= (8<<2) | (1<<0);
+ high &= ~(0x0000ffff);
+ high |= (FAM10H_PCI_MMIO_BASE>>(32-8));
+ wrmsr_safe(address, low, high);
+}
+
/*
* On a AMD dual core setup the lower bits of the APIC id distingush the cores.
* Assumes number of cores is a power of two.
@@ -655,6 +681,9 @@
/* Family 10 doesn't support C states in MWAIT so don't use it */
if (c->x86 == 0x10 && !force_mwait)
clear_bit(X86_FEATURE_MWAIT, &c->x86_capability);
+
+ if (c->x86 == 0x10)
+ fam10h_check_enable_mmcfg(c);
}
static void __cpuinit detect_ht(struct cpuinfo_x86 *c)
-
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