Commit 61603016 authored by Russell King's avatar Russell King
Browse files

ARM: kexec: fix crashkernel= handling 



When the kernel crashkernel parameter is specified with just a size, we
are supposed to allocate a region from RAM to store the crashkernel.
However, ARM merely reserves physical address zero with no checking that
there is even RAM there.

Fix this by lifting similar code from x86, importing it to ARM with the
ARM specific parameters added.  In the absence of any platform specific
information, we allocate the crashkernel region from the first 512MB of
physical memory.

Update the kdump documentation to reflect this change.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Reviewed-by: default avatarPratyush Anand <panand@redhat.com>
parent f55532a0

Documentation/kdump/kdump.txt

+3 −10
Original line number Diff line number Diff line
@@ -263,12 +263,6 @@ The syntax is: 
    crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]

    range=start-[end]



Please note, on arm, the offset is required.

    crashkernel=<range1>:<size1>[,<range2>:<size2>,...]@offset

    range=start-[end]



    'start' is inclusive and 'end' is exclusive.



For example:



    crashkernel=512M-2G:64M,2G-:128M
@@ -307,10 +301,9 @@ Boot into System Kernel 
   on the memory consumption of the kdump system. In general this is not

   dependent on the memory size of the production system.



   On arm, use "crashkernel=Y@X". Note that the start address of the kernel

   will be aligned to 128MiB (0x08000000), so if the start address is not then

   any space below the alignment point may be overwritten by the dump-capture kernel,

   which means it is possible that the vmcore is not that precise as expected.

   On arm, the use of "crashkernel=Y@X" is no longer necessary; the

   kernel will automatically locate the crash kernel image within the

   first 512MB of RAM if X is not given.





Load the Dump-capture Kernel

arch/arm/kernel/setup.c

+29 −0
Original line number Diff line number Diff line
@@ -938,6 +938,13 @@ static int __init init_machine_late(void) 
late_initcall(init_machine_late);



#ifdef CONFIG_KEXEC

/*

 * The crash region must be aligned to 128MB to avoid

 * zImage relocating below the reserved region.

 */

#define CRASH_ALIGN	(128 << 20)

#define CRASH_ADDR_MAX	(PHYS_OFFSET + (512 << 20))



static inline unsigned long long get_total_mem(void)

{

	unsigned long total;
@@ -965,6 +972,28 @@ static void __init reserve_crashkernel(void) 
	if (ret)

		return;



	if (crash_base <= 0) {

		unsigned long long crash_max = CRASH_ADDR_MAX;

		if (crash_max > (u32)~0)

			crash_max = (u32)~0;

		crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max,

						    crash_size, CRASH_ALIGN);

		if (!crash_base) {

			pr_err("crashkernel reservation failed - No suitable area found.\n");

			return;

		}

	} else {

		unsigned long long start;



		start = memblock_find_in_range(crash_base,

					       crash_base + crash_size,

					       crash_size, SECTION_SIZE);

		if (start != crash_base) {

			pr_err("crashkernel reservation failed - memory is in use.\n");

			return;

		}

	}



	ret = memblock_reserve(crash_base, crash_size);

	if (ret < 0) {

		pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n",

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