[linux-2.6-block.git] / arch / riscv / kernel / crash_dump.c

// SPDX-License-Identifier: GPL-2.0
/*
 * This code comes from arch/arm64/kernel/crash_dump.c
 * Created by: AKASHI Takahiro <takahiro.akashi@linaro.org>
 * Copyright (C) 2017 Linaro Limited
 */

#include <linux/crash_dump.h>
#include <linux/io.h>
#include <linux/uio.h>

ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
			 size_t csize, unsigned long offset)
{
	void *vaddr;

	if (!csize)
		return 0;

	vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB);
	if (!vaddr)
		return -ENOMEM;

	csize = copy_to_iter(vaddr + offset, csize, iter);

	memunmap(vaddr);
	return csize;
}
Commit	Line	Data
56409750 NK	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* This code comes from arch/arm64/kernel/crash_dump.c
	4	* Created by: AKASHI Takahiro <takahiro.akashi@linaro.org>
	5	* Copyright (C) 2017 Linaro Limited
	6	*/
	7
	8	#include <linux/crash_dump.h>
	9	#include <linux/io.h>
5d8de293	10	#include <linux/uio.h>
56409750	11
5d8de293 MWO	12	ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn,
5d8de293 MWO	13	size_t csize, unsigned long offset)
56409750 NK	14	{
	15	void *vaddr;
	16
	17	if (!csize)
	18	return 0;
	19
	20	vaddr = memremap(__pfn_to_phys(pfn), PAGE_SIZE, MEMREMAP_WB);
	21	if (!vaddr)
	22	return -ENOMEM;
	23
5d8de293	24	csize = copy_to_iter(vaddr + offset, csize, iter);
56409750 NK	25
	26	memunmap(vaddr);
	27	return csize;
	28	}