[tip:x86/mm] x86: ioremap mptable

[Yinghai Lu]

Commit-ID:  8d4dd919b46ed982da6ef6bf6fcec454cd7a5b1b
Gitweb:     http://git.kernel.org/tip/8d4dd919b46ed982da6ef6bf6fcec454cd7a5b1b
Author:     "Yinghai Lu" <yinghai@xxxxxxxxxx>
AuthorDate: Wed, 4 Mar 2009 01:25:21 -0800
Commit:     Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 4 Mar 2009 20:55:04 +0100

x86: ioremap mptable

Impact: fix boot with mptable above max_low_mapped

Try to use early_ioremap() to map MPC to make sure it works even it is
at the end of ram.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
LKML-Reference: <49AE4901.3090801@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Reported-and-tested-by: Kevin O'Connor <kevin@xxxxxxxxxxxx>


---
 arch/x86/kernel/mpparse.c |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/mpparse.c b/arch/x86/kernel/mpparse.c
index 37cb1bd..ae9060c 100644
--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -558,6 +558,19 @@ static inline void __init construct_default_ISA_mptable(int mpc_default_type)
 
 static struct mpf_intel *mpf_found;
 
+static unsigned long __init get_mpc_size(unsigned long physptr)
+{
+	struct mpc_table *mpc;
+	unsigned long size;
+
+	mpc = early_ioremap(physptr, PAGE_SIZE);
+	size = mpc->length;
+	early_iounmap(mpc, PAGE_SIZE);
+	apic_printk(APIC_VERBOSE, "  mpc: %lx-%lx\n", physptr, physptr + size);
+
+	return size;
+}
+
 /*
  * Scan the memory blocks for an SMP configuration block.
  */
@@ -611,12 +624,16 @@ static void __init __get_smp_config(unsigned int early)
 		construct_default_ISA_mptable(mpf->feature1);
 
 	} else if (mpf->physptr) {
+		struct mpc_table *mpc;
+		unsigned long size;
 
+		size = get_mpc_size(mpf->physptr);
+		mpc = early_ioremap(mpf->physptr, size);
 		/*
 		 * Read the physical hardware table.  Anything here will
 		 * override the defaults.
 		 */
-		if (!smp_read_mpc(phys_to_virt(mpf->physptr), early)) {
+		if (!smp_read_mpc(mpc, early)) {
 #ifdef CONFIG_X86_LOCAL_APIC
 			smp_found_config = 0;
 #endif
@@ -624,8 +641,10 @@ static void __init __get_smp_config(unsigned int early)
 			       "BIOS bug, MP table errors detected!...\n");
 			printk(KERN_ERR "... disabling SMP support. "
 			       "(tell your hw vendor)\n");
+			early_iounmap(mpc, size);
 			return;
 		}
+		early_iounmap(mpc, size);
 
 		if (early)
 			return;
--
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