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powerpc: Use more accurate limit for first segment memory allocations

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Author: Milton Miller <miltonm@bga.com>

On large machines we are running out of room below 256MB. In some cases we
only need to ensure the allocation is in the first segment, which may be
256MB or 1TB.

Add slb0_limit and use it to specify the upper limit for the irqstack and
emergency stacks.

On a large ppc64 box, this fixes a panic at boot when the crashkernel=
option is specified (previously we would run out of memory below 256MB).

Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2010-05-10 18:59:18 +00:00 committed by Benjamin Herrenschmidt
parent 5d7a87217d
commit 095c7965f4
1 changed files with 13 additions and 4 deletions
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17
arch/powerpc/kernel/setup_64.c
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@ -424,9 +424,18 @@ void __init setup_system(void)
DBG(" <- setup_system()\n");
}
static u64 slb0_limit(void)
{
if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) {
return 1UL << SID_SHIFT_1T;
}
return 1UL << SID_SHIFT;
}
#ifdef CONFIG_IRQSTACKS
static void __init irqstack_early_init(void)
{
u64 limit = slb0_limit();
unsigned int i;
/*
@ -436,10 +445,10 @@ static void __init irqstack_early_init(void)
for_each_possible_cpu(i) {
softirq_ctx[i] = (struct thread_info *)
__va(lmb_alloc_base(THREAD_SIZE,
THREAD_SIZE, 0x10000000));
THREAD_SIZE, limit));
hardirq_ctx[i] = (struct thread_info *)
__va(lmb_alloc_base(THREAD_SIZE,
THREAD_SIZE, 0x10000000));
THREAD_SIZE, limit));
}
}
#else
@ -470,7 +479,7 @@ static void __init exc_lvl_early_init(void)
*/
static void __init emergency_stack_init(void)
{
unsigned long limit;
u64 limit;
unsigned int i;
/*
@ -482,7 +491,7 @@ static void __init emergency_stack_init(void)
* bringup, we need to get at them in real mode. This means they
* must also be within the RMO region.
*/
limit = min(0x10000000ULL, lmb.rmo_size);
limit = min(slb0_limit(), lmb.rmo_size);
for_each_possible_cpu(i) {
unsigned long sp;