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ebbc957016
Make it possible to handle not only single-, but also multi-
segment iterators in copy_oldmem_iter() callback. Change the
semantics of called functions to match the iterator model -
instead of an error code the exact number of bytes copied is
returned.
The swap page used to copy data to user space is adopted for
kernel space too. That does not bring any performance impact.
Suggested-by: Matthew Wilcox <willy@infradead.org>
Fixes: cc02e6e21a ("s390/crash: add missing iterator advance in copy_oldmem_page()")
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Link: https://lore.kernel.org/r/5af6da3a0bffe48a90b0b7139ecf6a818b2d18e8.1658206891.git.agordeev@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* OS info memory interface
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*
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* Copyright IBM Corp. 2012
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* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
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*/
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#ifndef _ASM_S390_OS_INFO_H
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#define _ASM_S390_OS_INFO_H
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#include <linux/uio.h>
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#define OS_INFO_VERSION_MAJOR 1
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#define OS_INFO_VERSION_MINOR 1
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#define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */
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#define OS_INFO_VMCOREINFO 0
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#define OS_INFO_REIPL_BLOCK 1
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struct os_info_entry {
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u64 addr;
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u64 size;
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u32 csum;
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} __packed;
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struct os_info {
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u64 magic;
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u32 csum;
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u16 version_major;
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u16 version_minor;
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u64 crashkernel_addr;
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u64 crashkernel_size;
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struct os_info_entry entry[2];
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u8 reserved[4024];
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} __packed;
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void os_info_init(void);
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void os_info_entry_add(int nr, void *ptr, u64 len);
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void os_info_crashkernel_add(unsigned long base, unsigned long size);
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u32 os_info_csum(struct os_info *os_info);
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#ifdef CONFIG_CRASH_DUMP
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void *os_info_old_entry(int nr, unsigned long *size);
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size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count);
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static inline int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
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{
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struct iov_iter iter;
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struct kvec kvec;
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kvec.iov_base = dst;
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kvec.iov_len = count;
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iov_iter_kvec(&iter, WRITE, &kvec, 1, count);
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if (copy_oldmem_iter(&iter, src, count) < count)
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return -EFAULT;
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return 0;
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}
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#else
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static inline void *os_info_old_entry(int nr, unsigned long *size)
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{
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return NULL;
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}
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#endif
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#endif /* _ASM_S390_OS_INFO_H */
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