From f7f0b7dc720f81b53afffb6779437086cdc3f62d Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Tue, 2 Aug 2016 14:05:48 -0700
Subject: [PATCH] ARM: kdump: advertise boot aliased crash kernel resource
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>
---
arch/arm/kernel/setup.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index da2f6c360f6bc..6c8c888c1152a 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -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) {}
--
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