AuxXxilium/linux_dsm_epyc7002
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x86: ioremap mptable

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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@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <49AE4901.3090801@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Reported-and-tested-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Yinghai Lu 2009-03-04 01:25:21 -08:00 committed by Ingo Molnar
parent b68adb16f2
commit 8d4dd919b4
1 changed files with 20 additions and 1 deletions
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21
arch/x86/kernel/mpparse.c
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@ -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;