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powerpc: Export memory limit via device tree

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The powerpc kernel doesn't export the memory limit enforced by 'mem='
kernel parameter. This is required for building the ELF header in
kexec-tools to limit the vmcore to capture only the used memory. On
powerpc the kexec-tools depends on the device-tree for memory related
information, unlike /proc/iomem on the x86.

Without this information, the kexec-tools assumes the entire System
RAM and vmcore creates an unnecessarily larger dump.

This patch exports the memory limit, if present, via
chosen/linux,memory-limit
property, so that the vmcore can be limited to the memory limit.

The prom_init seems to export this value in the same node. But doesn't
really
appear there.  Also the memory_limit gets adjusted with the processing of
crashkernel= parameter. This patch makes sure we get the actual limit.

The kexec-tools will use the value to limit the 'end' of the memory
regions.

Tested this patch on ppc64 and ppc32(ppc440) with a kexec-tools
patch by Mahesh.

Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Tested-by: Mahesh J. Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Suzuki Poulose 2012-08-21 01:42:43 +00:00 committed by Benjamin Herrenschmidt
parent a84fcd4687
commit 4bc77a5ed2
1 changed files with 12 additions and 0 deletions
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12
arch/powerpc/kernel/machine_kexec.c
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@ -204,6 +204,12 @@ static struct property crashk_size_prop = {
.value = &crashk_size,
};
static struct property memory_limit_prop = {
.name = "linux,memory-limit",
.length = sizeof(unsigned long long),
.value = &memory_limit,
};
static void __init export_crashk_values(struct device_node *node)
{
struct property *prop;
@ -223,6 +229,12 @@ static void __init export_crashk_values(struct device_node *node)
crashk_size = resource_size(&crashk_res);
prom_add_property(node, &crashk_size_prop);
}
/*
* memory_limit is required by the kexec-tools to limit the
* crash regions to the actual memory used.
*/
prom_update_property(node, &memory_limit_prop);
}
static int __init kexec_setup(void)