The patch titled
Subject: ARM: use generic interface to simplify crashkernel reservation
has been added to the -mm mm-nonmm-unstable branch. Its filename is
arm-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/arm-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: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
Subject: ARM: use generic interface to simplify crashkernel reservation
Date: Fri, 19 Jul 2024 17:57:35 +0800
Currently, x86, arm64, riscv and loongarch has been switched to generic
crashkernel reservation, which is also ready for 32bit system. So with
the help of function parse_crashkernel() and generic
reserve_crashkernel_generic(), arm32 crashkernel reservation can also be
simplified by steps:
1) Add a new header file <asm/crash_reserve.h>, and define CRASH_ALIGN,
CRASH_ADDR_LOW_MAX, CRASH_ADDR_HIGH_MAX in it;
2) Add arch_reserve_crashkernel() to call parse_crashkernel() and
reserve_crashkernel_generic();
3) Add ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION Kconfig in
arch/arm/Kconfig.
The old reserve_crashkernel() can be removed.
Following test cases have been performed as expected on QEMU vexpress-a9
(1GB system memory):
1) crashkernel=4G,high // invalid
2) crashkernel=1G,high // invalid
3) crashkernel=1G,high crashkernel=0M,low // invalid
4) crashkernel=256M,high // invalid
5) crashkernel=256M,low // invalid
6) crashkernel=256M crashkernel=256M,high // high is ignored, ok
7) crashkernel=256M crashkernel=256M,low // low is ignored, ok
8) crashkernel=256M,high crashkernel=256M,low // invalid
9) crashkernel=256M,high crashkernel=4G,low // invalid
10) crashkernel=256M // ok
11) crashkernel=512M // ok
12) crashkernel=256M@0x88000000 // ok
13) crashkernel=256M@0x78000000 // ok
14) crashkernel=512M@0x78000000 // ok
Link: https://lkml.kernel.org/r/20240719095735.1912878-4-ruanjinjie@xxxxxxxxxx
Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
Acked-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: Albert Ou <aou@xxxxxxxxxxxxxxxxx>
Cc: Andrew Davis <afd@xxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Chen Jiahao <chenjiahao16@xxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Eric DeVolder <eric.devolder@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Javier Martinez Canillas <javierm@xxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Rob Herring (Arm) <robh@xxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: WANG Xuerui <kernel@xxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Youling Tang <tangyouling@xxxxxxxxxx>
Cc: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/Kconfig | 3 +
arch/arm/include/asm/crash_reserve.h | 24 +++++++++
arch/arm/kernel/setup.c | 63 +++----------------------
3 files changed, 36 insertions(+), 54 deletions(-)
--- /dev/null
+++ a/arch/arm/include/asm/crash_reserve.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ARM_CRASH_RESERVE_H
+#define _ARM_CRASH_RESERVE_H
+
+/*
+ * The crash region must be aligned to 128MB to avoid
+ * zImage relocating below the reserved region.
+ */
+#define CRASH_ALIGN (128 << 20)
+
+#define CRASH_ADDR_LOW_MAX crash_addr_low_max()
+#define CRASH_ADDR_HIGH_MAX memblock_end_of_DRAM()
+
+static inline unsigned long crash_addr_low_max(void)
+{
+ unsigned long long crash_max = idmap_to_phys((u32)~0);
+ unsigned long long lowmem_max = __pa(high_memory - 1) + 1;
+
+ return (crash_max > lowmem_max) ? lowmem_max : crash_max;
+}
+
+
+#define HAVE_ARCH_ADD_CRASH_RES_TO_IOMEM_EARLY
+#endif
--- a/arch/arm/Kconfig~arm-use-generic-interface-to-simplify-crashkernel-reservation
+++ a/arch/arm/Kconfig
@@ -1595,6 +1595,9 @@ config ATAGS_PROC
config ARCH_SUPPORTS_CRASH_DUMP
def_bool y
+config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+ def_bool CRASH_RESERVE
+
config AUTO_ZRELADDR
bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM
default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100)
--- a/arch/arm/kernel/setup.c~arm-use-generic-interface-to-simplify-crashkernel-reservation
+++ a/arch/arm/kernel/setup.c
@@ -979,13 +979,6 @@ static int __init init_machine_late(void
}
late_initcall(init_machine_late);
-#ifdef CONFIG_CRASH_RESERVE
-/*
- * The crash region must be aligned to 128MB to avoid
- * zImage relocating below the reserved region.
- */
-#define CRASH_ALIGN (128 << 20)
-
static inline unsigned long long get_total_mem(void)
{
unsigned long total;
@@ -994,60 +987,25 @@ static inline unsigned long long get_tot
return total << PAGE_SHIFT;
}
-/**
- * reserve_crashkernel() - reserves memory are for crash kernel
- *
- * This function reserves memory area given in "crashkernel=" kernel command
- * line parameter. The memory reserved is used by a dump capture kernel when
- * primary kernel is crashing.
- */
-static void __init reserve_crashkernel(void)
+static void __init arch_reserve_crashkernel(void)
{
- unsigned long long crash_size, crash_base;
+ unsigned long long crash_size, crash_base, low_size = 0;
unsigned long long total_mem;
+ bool high = false;
int ret;
+ if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
+ return;
+
total_mem = get_total_mem();
ret = parse_crashkernel(boot_command_line, total_mem,
&crash_size, &crash_base,
- NULL, NULL);
+ &low_size, &high);
/* invalid value specified or crashkernel=0 */
if (ret || !crash_size)
return;
- if (crash_base <= 0) {
- unsigned long long crash_max = idmap_to_phys((u32)~0);
- unsigned long long lowmem_max = __pa(high_memory - 1) + 1;
- if (crash_max > lowmem_max)
- crash_max = lowmem_max;
-
- crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
- CRASH_ALIGN, crash_max);
- if (!crash_base) {
- pr_err("crashkernel reservation failed - No suitable area found.\n");
- return;
- }
- } else {
- unsigned long long crash_max = crash_base + crash_size;
- unsigned long long start;
-
- start = memblock_phys_alloc_range(crash_size, SECTION_SIZE,
- crash_base, crash_max);
- if (!start) {
- pr_err("crashkernel reservation failed - memory is in use.\n");
- return;
- }
- }
-
- pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
- (unsigned long)(crash_size >> 20),
- (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);
+ reserve_crashkernel_generic(boot_command_line, crash_size, crash_base, low_size, high);
if (arm_has_idmap_alias()) {
/*
@@ -1064,9 +1022,6 @@ static void __init reserve_crashkernel(v
insert_resource(&iomem_resource, &crashk_boot_res);
}
}
-#else
-static inline void reserve_crashkernel(void) {}
-#endif /* CONFIG_CRASH_RESERVE*/
void __init hyp_mode_check(void)
{
@@ -1189,7 +1144,7 @@ void __init setup_arch(char **cmdline_p)
if (!is_smp())
hyp_mode_check();
- reserve_crashkernel();
+ arch_reserve_crashkernel();
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
_
Patches currently in -mm which might be from ruanjinjie@xxxxxxxxxx are
crash-fix-x86_32-crash-memory-reserve-dead-loop-bug.patch
crash-fix-x86_32-crash-memory-reserve-dead-loop.patch
arm-use-generic-interface-to-simplify-crashkernel-reservation.patch
