[PATCH] x86: SGU UV Map MMIO-High memory range

[Jack Steiner <steiner@sgi.com>]

UV depends on the MMRHI space being identity mapped.  The patch:
	x86: Make 64-bit efi_ioremap use ioremap on MMIO regions

changed this to make efi regions at a different address using ioremap.
Add the identity mapping to uv_system_init.

(Note this code was previously present but was deleted when BIOS added
the ranges to the EFI map - previous efi code identify mapped the ranges).

Signed-off-by: Jack Steiner <steiner@sgi.com>



---
 arch/x86/kernel/apic/x2apic_uv_x.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

Index: linux/arch/x86/kernel/apic/x2apic_uv_x.c
===================================================================
--- linux.orig/arch/x86/kernel/apic/x2apic_uv_x.c	2009-08-31 13:34:18.000000000 -0500
+++ linux/arch/x86/kernel/apic/x2apic_uv_x.c	2009-08-31 17:15:05.000000000 -0500
@@ -390,6 +390,16 @@ static __init void map_gru_high(int max_
 		map_high("GRU", gru.s.base, shift, max_pnode, map_wb);
 }
 
+static __init void map_mmr_high(int max_pnode)
+{
+	union uvh_rh_gam_mmr_overlay_config_mmr_u mmr;
+	int shift = UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR_BASE_SHFT;
+
+	mmr.v = uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR);
+	if (mmr.s.enable)
+		map_high("MMR", mmr.s.base, shift, max_pnode, map_uc);
+}
+
 static __init void map_mmioh_high(int max_pnode)
 {
 	union uvh_rh_gam_mmioh_overlay_config_mmr_u mmioh;
@@ -644,6 +654,7 @@ void __init uv_system_init(void)
 	}
 
 	map_gru_high(max_pnode);
+	map_mmr_high(max_pnode);
 	map_mmioh_high(max_pnode);
 
 	uv_cpu_init();