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8c9cc6e12a
hsavmcore is designed to make the dump process with kdump more efficient. With hsavmcore, the HSA memory that contains a part of the production kernel's memory can be released early in the process. Depending on the size of the production kernel's memory, writing the dump to persistent storage can be time consuming and prevent the HSA memory from being reused by other LPARs. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Acked-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
/*
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* Copyright IBM Corp. 2021
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#ifndef _HSAVMCORE_HSA_H
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#define _HSAVMCORE_HSA_H
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#include <stddef.h>
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/*
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* The interface to a HSA memory reader.
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* This interface must be implemented by a concrete HSA memory reader.
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*/
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struct hsa_reader {
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/* Total HSA memory size */
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long hsa_size;
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/* Offset of HSA memory in /proc/vmcore */
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long hsa_vmcore_offset;
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/* Destroys a concrete HSA memory reader */
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void (*destroy)(struct hsa_reader *self);
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/* Reads a HSA memory block given by offset and size */
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int (*read_at)(struct hsa_reader *self, long offset, void *buf,
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int size);
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};
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static inline long hsa_get_size(struct hsa_reader *self)
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{
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return self->hsa_size;
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}
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static inline long hsa_get_vmcore_offset(struct hsa_reader *self)
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{
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return self->hsa_vmcore_offset;
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}
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static inline void destroy_hsa_reader(struct hsa_reader *self)
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{
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self->destroy(self);
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}
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static inline int read_hsa_at(struct hsa_reader *self, long offset, void *buf,
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int size)
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{
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return self->read_at(self, offset, buf, size);
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}
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/*
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* Reads total HSA memory size from /sys/kernel/debug/zcore/hsa.
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*/
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long get_hsa_size(const char *zcore_hsa_path);
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/*
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* Returns the offset of HSA memory in /proc/vmcore.
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*/
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long get_hsa_vmcore_offset(const char *vmcore_path);
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/*
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* Releases HSA memory.
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*/
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int release_hsa(const char *zcore_hsa_path);
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/*
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* Returns a pointer to the enclosing struct which contains
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* the variable pointed to by the given pointer as a member.
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*/
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#define container_of(ptr, type, member) \
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({ \
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const typeof(((type *)NULL)->member) *mptr = (ptr); \
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(type *)((char *)mptr - offsetof(type, member)); \
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})
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#endif
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