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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/arch/powerpc/include/asm/kexec_ranges.h

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powerpc/kexec_file: Add helper functions for getting memory ranges In kexec case, the kernel to be loaded uses the same memory layout as the running kernel. So, passing on the DT of the running kernel would be good enough. But in case of kdump, different memory ranges are needed to manage loading the kdump kernel, booting into it and exporting the elfcore of the crashing kernel. The ranges are exclude memory ranges, usable memory ranges, reserved memory ranges and crash memory ranges. Exclude memory ranges specify the list of memory ranges to avoid while loading kdump segments. Usable memory ranges list the memory ranges that could be used for booting kdump kernel. Reserved memory ranges list the memory regions for the loading kernel's reserve map. Crash memory ranges list the memory ranges to be exported as the crashing kernel's elfcore. Add helper functions for setting up the above mentioned memory ranges. This helpers facilitate in understanding the subsequent changes better and make it easy to setup the different memory ranges listed above, as and when appropriate. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Tested-by: Pingfan Liu <piliu@redhat.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602279194.575379.8526552316948643550.stgit@hbathini
2020-07-29 14:40:00 +03:00
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef _ASM_POWERPC_KEXEC_RANGES_H
#define _ASM_POWERPC_KEXEC_RANGES_H
#define MEM_RANGE_CHUNK_SZ 2048 /* Memory ranges size chunk */
void sort_memory_ranges(struct crash_mem *mrngs, bool merge);
struct crash_mem *realloc_mem_ranges(struct crash_mem **mem_ranges);
int add_mem_range(struct crash_mem **mem_ranges, u64 base, u64 size);
powerpc/kexec_file: Avoid stomping memory used by special regions crashkernel region could have an overlap with special memory regions like OPAL, RTAS, TCE table & such. These regions are referred to as excluded memory ranges. Setup these ranges during image probe in order to avoid them while finding the buffer for different kdump segments. Override arch_kexec_locate_mem_hole() to locate a memory hole taking these ranges into account. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602281047.575379.6636807148335160795.stgit@hbathini
2020-07-29 14:40:16 +03:00
int add_tce_mem_ranges(struct crash_mem **mem_ranges);
int add_initrd_mem_range(struct crash_mem **mem_ranges);
#ifdef CONFIG_PPC_BOOK3S_64
int add_htab_mem_range(struct crash_mem **mem_ranges);
#else
static inline int add_htab_mem_range(struct crash_mem **mem_ranges)
{
return 0;
}
#endif
int add_kernel_mem_range(struct crash_mem **mem_ranges);
int add_rtas_mem_range(struct crash_mem **mem_ranges);
int add_opal_mem_range(struct crash_mem **mem_ranges);
int add_reserved_mem_ranges(struct crash_mem **mem_ranges);
powerpc/kexec_file: Add helper functions for getting memory ranges In kexec case, the kernel to be loaded uses the same memory layout as the running kernel. So, passing on the DT of the running kernel would be good enough. But in case of kdump, different memory ranges are needed to manage loading the kdump kernel, booting into it and exporting the elfcore of the crashing kernel. The ranges are exclude memory ranges, usable memory ranges, reserved memory ranges and crash memory ranges. Exclude memory ranges specify the list of memory ranges to avoid while loading kdump segments. Usable memory ranges list the memory ranges that could be used for booting kdump kernel. Reserved memory ranges list the memory regions for the loading kernel's reserve map. Crash memory ranges list the memory ranges to be exported as the crashing kernel's elfcore. Add helper functions for setting up the above mentioned memory ranges. This helpers facilitate in understanding the subsequent changes better and make it easy to setup the different memory ranges listed above, as and when appropriate. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Tested-by: Pingfan Liu <piliu@redhat.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602279194.575379.8526552316948643550.stgit@hbathini
2020-07-29 14:40:00 +03:00
#endif /* _ASM_POWERPC_KEXEC_RANGES_H */