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ARM: kdump: advertise boot aliased crash kernel resource

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Advertise a resource which describes where the crash kernel is located
in the boot view of RAM.  This allows kexec-tools to have this vital
information.

Link: http://lkml.kernel.org/r/E1b8knz-0004H4-Bd@rmk-PC.armlinux.org.uk
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Baoquan He <bhe@redhat.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Pratyush Anand <panand@redhat.com>
Cc: Vitaly Andrianov <vitalya@ti.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Russell King 2016-08-02 14:05:48 -07:00 committed by Linus Torvalds
parent 4caf961524
commit f7f0b7dc72
1 changed files with 16 additions and 0 deletions
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16
arch/arm/kernel/setup.c
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@ -1000,9 +1000,25 @@ static void __init reserve_crashkernel(void)
(unsigned long)(crash_base >> 20),
(unsigned long)(total_mem >> 20));
/* The crashk resource must always be located in normal mem */
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
insert_resource(&iomem_resource, &crashk_res);
if (arm_has_idmap_alias()) {
/*
* If we have a special RAM alias for use at boot, we
* need to advertise to kexec tools where the alias is.
*/
static struct resource crashk_boot_res = {
.name = "Crash kernel (boot alias)",
.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
};
crashk_boot_res.start = phys_to_idmap(crash_base);
crashk_boot_res.end = crashk_boot_res.start + crash_size - 1;
insert_resource(&iomem_resource, &crashk_boot_res);
}
}
#else
static inline void reserve_crashkernel(void) {}