LoongArch: kdump: Add single kernel image implementation

This feature depends on the kernel being relocatable.

Enable using single kernel image for kdump, and then no longer need to
build two kernels (production kernel and capture kernel share a single
kernel image).

Also enable CONFIG_CRASH_DUMP in loongson3_defconfig.

Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 2fc18a3..c6a02d2 100644 (file)
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -473,6 +473,7 @@ config KEXEC
 
 config CRASH_DUMP
        bool "Build kdump crash kernel"
+       select RELOCATABLE
        help
          Generate crash dump after being started by kexec. This should
          be normally only set in special crash dump kernels which are
@@ -482,17 +483,6 @@ config CRASH_DUMP
 
          For more details see Documentation/admin-guide/kdump/kdump.rst
 
-config PHYSICAL_START
-       hex "Physical address where the kernel is loaded"
-       default "0x90000000a0000000"
-       depends on CRASH_DUMP
-       help
-         This gives the XKPRANGE address where the kernel is loaded.
-         If you plan to use kernel for capturing the crash dump change
-         this value to start of the reserved region (the "X" value as
-         specified in the "crashkernel=YM@XM" command line boot parameter
-         passed to the panic-ed kernel).
-
 config RELOCATABLE
        bool "Relocatable kernel"
        help

diff --git a/arch/loongarch/Makefile b/arch/loongarch/Makefile
index 7685929..f71edf5 100644 (file)
--- a/arch/loongarch/Makefile
+++ b/arch/loongarch/Makefile
@@ -79,11 +79,7 @@ endif
 cflags-y += -ffreestanding
 cflags-y += $(call cc-option, -mno-check-zero-division)
 
-ifndef CONFIG_PHYSICAL_START
 load-y         = 0x9000000000200000
-else
-load-y         = $(CONFIG_PHYSICAL_START)
-endif
 bootvars-y     = VMLINUX_LOAD_ADDRESS=$(load-y)
 
 drivers-$(CONFIG_PCI)          += arch/loongarch/pci/

diff --git a/arch/loongarch/configs/loongson3_defconfig b/arch/loongarch/configs/loongson3_defconfig
index eb84cae..e18213f 100644 (file)
--- a/arch/loongarch/configs/loongson3_defconfig
+++ b/arch/loongarch/configs/loongson3_defconfig
@@ -48,6 +48,7 @@ CONFIG_HOTPLUG_CPU=y
 CONFIG_NR_CPUS=64
 CONFIG_NUMA=y
 CONFIG_KEXEC=y
+CONFIG_CRASH_DUMP=y
 CONFIG_SUSPEND=y
 CONFIG_HIBERNATION=y
 CONFIG_ACPI=y

diff --git a/arch/loongarch/include/asm/addrspace.h b/arch/loongarch/include/asm/addrspace.h
index d342935..8fb699b 100644 (file)
--- a/arch/loongarch/include/asm/addrspace.h
+++ b/arch/loongarch/include/asm/addrspace.h
@@ -125,4 +125,6 @@ extern unsigned long vm_map_base;
 #define ISA_IOSIZE     SZ_16K
 #define IO_SPACE_LIMIT (PCI_IOSIZE - 1)
 
+#define PHYS_LINK_KADDR        PHYSADDR(VMLINUX_LOAD_ADDRESS)
+
 #endif /* _ASM_ADDRSPACE_H */

diff --git a/arch/loongarch/kernel/head.S b/arch/loongarch/kernel/head.S
index 1d35bec..aa64b17 100644 (file)
--- a/arch/loongarch/kernel/head.S
+++ b/arch/loongarch/kernel/head.S
@@ -24,7 +24,7 @@ _head:
        .org    0x8
        .dword  kernel_entry            /* Kernel entry point */
        .dword  _end - _text            /* Kernel image effective size */
-       .quad   0                       /* Kernel image load offset from start of RAM */
+       .quad   PHYS_LINK_KADDR         /* Kernel image load offset from start of RAM */
        .org    0x38                    /* 0x20 ~ 0x37 reserved */
        .long   LINUX_PE_MAGIC
        .long   pe_header - _head       /* Offset to the PE header */