The patch titled
Subject: arm64: kdump: use generic interface to simplify crashkernel reservation
has been added to the -mm mm-nonmm-unstable branch. Its filename is
arm64-kdump-use-generic-interface-to-simplify-crashkernel-reservation.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/arm64-kdump-use-generic-interface-to-simplify-crashkernel-reservation.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: arm64: kdump: use generic interface to simplify crashkernel reservation
Date: Thu, 14 Sep 2023 11:31:40 +0800
With the help of newly changed function parse_crashkernel() and generic
reserve_crashkernel_generic(), crashkernel reservation can be simplified
by steps:
1) Add a new header file <asm/crash_core.h>, and define CRASH_ALIGN,
CRASH_ADDR_LOW_MAX, CRASH_ADDR_HIGH_MAX and
DEFAULT_CRASH_KERNEL_LOW_SIZE in <asm/crash_core.h>;
2) Add arch_reserve_crashkernel() to call parse_crashkernel() and
reserve_crashkernel_generic();
3) Add ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION Kconfig in
arch/arm64/Kconfig.
The old reserve_crashkernel_low() and reserve_crashkernel() can be
removed.
Link: https://lkml.kernel.org/r/20230914033142.676708-8-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Reviewed-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Chen Jiahao <chenjiahao16@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/Kconfig | 3
arch/arm64/include/asm/crash_core.h | 10 +
arch/arm64/mm/init.c | 140 +-------------------------
3 files changed, 21 insertions(+), 132 deletions(-)
--- /dev/null
+++ a/arch/arm64/include/asm/crash_core.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ARM64_CRASH_CORE_H
+#define _ARM64_CRASH_CORE_H
+
+/* Current arm64 boot protocol requires 2MB alignment */
+#define CRASH_ALIGN SZ_2M
+
+#define CRASH_ADDR_LOW_MAX arm64_dma_phys_limit
+#define CRASH_ADDR_HIGH_MAX (PHYS_MASK + 1)
+#endif
--- a/arch/arm64/Kconfig~arm64-kdump-use-generic-interface-to-simplify-crashkernel-reservation
+++ a/arch/arm64/Kconfig
@@ -1483,6 +1483,9 @@ config ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_S
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y
+config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+ def_bool CRASH_CORE
+
config TRANS_TABLE
def_bool y
depends on HIBERNATION || KEXEC_CORE
--- a/arch/arm64/mm/init.c~arm64-kdump-use-generic-interface-to-simplify-crashkernel-reservation
+++ a/arch/arm64/mm/init.c
@@ -64,15 +64,6 @@ EXPORT_SYMBOL(memstart_addr);
*/
phys_addr_t __ro_after_init arm64_dma_phys_limit;
-/* Current arm64 boot protocol requires 2MB alignment */
-#define CRASH_ALIGN SZ_2M
-
-#define CRASH_ADDR_LOW_MAX arm64_dma_phys_limit
-#define CRASH_ADDR_HIGH_MAX (PHYS_MASK + 1)
-#define CRASH_HIGH_SEARCH_BASE SZ_4G
-
-#define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20)
-
/*
* To make optimal use of block mappings when laying out the linear
* mapping, round down the base of physical memory to a size that can
@@ -100,140 +91,25 @@ phys_addr_t __ro_after_init arm64_dma_ph
#define ARM64_MEMSTART_ALIGN (1UL << ARM64_MEMSTART_SHIFT)
#endif
-static int __init reserve_crashkernel_low(unsigned long long low_size)
+static void __init arch_reserve_crashkernel(void)
{
- unsigned long long low_base;
-
- low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
- if (!low_base) {
- pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
- return -ENOMEM;
- }
-
- pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",
- low_base, low_base + low_size, low_size >> 20);
-
- crashk_low_res.start = low_base;
- crashk_low_res.end = low_base + low_size - 1;
- insert_resource(&iomem_resource, &crashk_low_res);
-
- return 0;
-}
-
-/*
- * reserve_crashkernel() - reserves memory for crash kernel
- *
- * This function reserves memory area given in "crashkernel=" kernel command
- * line parameter. The memory reserved is used by dump capture kernel when
- * primary kernel is crashing.
- */
-static void __init reserve_crashkernel(void)
-{
- unsigned long long crash_low_size = 0, search_base = 0;
- unsigned long long crash_max = CRASH_ADDR_LOW_MAX;
+ unsigned long long low_size = 0;
unsigned long long crash_base, crash_size;
char *cmdline = boot_command_line;
- bool fixed_base = false;
bool high = false;
int ret;
if (!IS_ENABLED(CONFIG_KEXEC_CORE))
return;
- /* crashkernel=X[@offset] */
ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),
- &crash_size, &crash_base, NULL, NULL);
- if (ret == -ENOENT) {
- ret = parse_crashkernel_high(cmdline, 0, &crash_size, &crash_base);
- if (ret || !crash_size)
- return;
-
- /*
- * crashkernel=Y,low can be specified or not, but invalid value
- * is not allowed.
- */
- ret = parse_crashkernel_low(cmdline, 0, &crash_low_size, &crash_base);
- if (ret == -ENOENT)
- crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
- else if (ret)
- return;
-
- search_base = CRASH_HIGH_SEARCH_BASE;
- crash_max = CRASH_ADDR_HIGH_MAX;
- high = true;
- } else if (ret || !crash_size) {
- /* The specified value is invalid */
+ &crash_size, &crash_base,
+ &low_size, &high);
+ if (ret)
return;
- }
-
- crash_size = PAGE_ALIGN(crash_size);
-
- /* User specifies base address explicitly. */
- if (crash_base) {
- fixed_base = true;
- search_base = crash_base;
- crash_max = crash_base + crash_size;
- }
-retry:
- crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
- search_base, crash_max);
- if (!crash_base) {
- /*
- * For crashkernel=size[KMG]@offset[KMG], print out failure
- * message if can't reserve the specified region.
- */
- if (fixed_base) {
- pr_warn("crashkernel reservation failed - memory is in use.\n");
- return;
- }
-
- /*
- * For crashkernel=size[KMG], if the first attempt was for
- * low memory, fall back to high memory, the minimum required
- * low memory will be reserved later.
- */
- if (!high && crash_max == CRASH_ADDR_LOW_MAX) {
- crash_max = CRASH_ADDR_HIGH_MAX;
- search_base = CRASH_ADDR_LOW_MAX;
- crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
- goto retry;
- }
-
- /*
- * For crashkernel=size[KMG],high, if the first attempt was
- * for high memory, fall back to low memory.
- */
- if (high && crash_max == CRASH_ADDR_HIGH_MAX) {
- crash_max = CRASH_ADDR_LOW_MAX;
- search_base = 0;
- goto retry;
- }
- pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
- crash_size);
- return;
- }
-
- if ((crash_base >= CRASH_ADDR_LOW_MAX) && crash_low_size &&
- reserve_crashkernel_low(crash_low_size)) {
- memblock_phys_free(crash_base, crash_size);
- return;
- }
-
- pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
- crash_base, crash_base + crash_size, crash_size >> 20);
-
- /*
- * The crashkernel memory will be removed from the kernel linear
- * map. Inform kmemleak so that it won't try to access it.
- */
- kmemleak_ignore_phys(crash_base);
- if (crashk_low_res.end)
- kmemleak_ignore_phys(crashk_low_res.start);
-
- crashk_res.start = crash_base;
- crashk_res.end = crash_base + crash_size - 1;
- insert_resource(&iomem_resource, &crashk_res);
+ reserve_crashkernel_generic(cmdline, crash_size, crash_base,
+ low_size, high);
}
/*
@@ -479,7 +355,7 @@ void __init bootmem_init(void)
* request_standard_resources() depends on crashkernel's memory being
* reserved, so do it here.
*/
- reserve_crashkernel();
+ arch_reserve_crashkernel();
memblock_dump_all();
}
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
crash_corec-remove-unnecessary-parameter-of-function.patch
crash_core-change-the-prototype-of-function-parse_crashkernel.patch
crash_core-change-parse_crashkernel-to-support-crashkernel=highlow-parsing.patch
crash_core-add-generic-function-to-do-reservation.patch
crash_core-move-crashk_res-definition-into-crash_corec.patch
x86-kdump-use-generic-interface-to-simplify-crashkernel-reservation-code.patch
arm64-kdump-use-generic-interface-to-simplify-crashkernel-reservation.patch
riscv-kdump-use-generic-interface-to-simplify-crashkernel-reservation.patch
crash_corec-remove-unneeded-functions.patch
