x86, UV: Add common uv_early_read_mmr() function for reading MMRs

Early in boot, reading MMRs from the UV hub controller require
calls to early_ioremap()/early_iounmap().  Rather than
duplicating code, add a common function to do the
map/read/unmap.

Signed-off-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20101130195926.834804371@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index c1c52c3..0c3675f 100644 (file)
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -48,6 +48,16 @@ unsigned int uv_apicid_hibits;
 EXPORT_SYMBOL_GPL(uv_apicid_hibits);
 static DEFINE_SPINLOCK(uv_nmi_lock);
 
+static unsigned long __init uv_early_read_mmr(unsigned long addr)
+{
+       unsigned long val, *mmr;
+
+       mmr = early_ioremap(UV_LOCAL_MMR_BASE | addr, sizeof(*mmr));
+       val = *mmr;
+       early_iounmap(mmr, sizeof(*mmr));
+       return val;
+}
+
 static inline bool is_GRU_range(u64 start, u64 end)
 {
        return start >= gru_start_paddr && end <= gru_end_paddr;
@@ -58,16 +68,12 @@ static bool uv_is_untracked_pat_range(u64 start, u64 end)
        return is_ISA_range(start, end) || is_GRU_range(start, end);
 }
 
-static int early_get_nodeid(void)
+static int __init early_get_nodeid(void)
 {
        union uvh_node_id_u node_id;
-       unsigned long *mmr;
-
-       mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_NODE_ID, sizeof(*mmr));
-       node_id.v = *mmr;
-       early_iounmap(mmr, sizeof(*mmr));
 
        /* Currently, all blades have same revision number */
+       node_id.v = uv_early_read_mmr(UVH_NODE_ID);
        uv_min_hub_revision_id = node_id.s.revision;
 
        return node_id.s.node_id;
@@ -75,11 +81,7 @@ static int early_get_nodeid(void)
 
 static void __init early_get_apic_pnode_shift(void)
 {
-       unsigned long *mmr;
-
-       mmr = early_ioremap(UV_LOCAL_MMR_BASE | UVH_APICID, sizeof(*mmr));
-       uvh_apicid.v = *mmr;
-       early_iounmap(mmr, sizeof(*mmr));
+       uvh_apicid.v = uv_early_read_mmr(UVH_APICID);
        if (!uvh_apicid.v)
                /*
                 * Old bios, use default value
@@ -95,12 +97,8 @@ static void __init early_get_apic_pnode_shift(void)
 static void __init uv_set_apicid_hibit(void)
 {
        union uvh_lb_target_physical_apic_id_mask_u apicid_mask;
-       unsigned long *mmr;
 
-       mmr = early_ioremap(UV_LOCAL_MMR_BASE |
-               UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK, sizeof(*mmr));
-       apicid_mask.v = *mmr;
-       early_iounmap(mmr, sizeof(*mmr));
+       apicid_mask.v = uv_early_read_mmr(UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK);
        uv_apicid_hibits = apicid_mask.s.bit_enables & UV_APICID_HIBIT_MASK;
 }