mirror of
git://git.yoctoproject.org/linux-yocto.git
synced 2025-07-05 05:15:23 +02:00
3d5854d75e
When /proc/kcore is read an attempt to read the first two pages results in HW-specific page swap on s390 and another (so called prefix) pages are accessed instead. That leads to a wrong read. Allow architecture-specific translation of memory addresses using kc_xlate_dev_mem_ptr() and kc_unxlate_dev_mem_ptr() callbacks similarily to /dev/mem xlate_dev_mem_ptr() and unxlate_dev_mem_ptr() callbacks. That way an architecture can deal with specific physical memory ranges. Re-use the existing /dev/mem callback implementation on s390, which handles the described prefix pages swapping correctly. For other architectures the default callback is basically NOP. It is expected the condition (vaddr == __va(__pa(vaddr))) always holds true for KCORE_RAM memory type. Link: https://lkml.kernel.org/r/20240930122119.1651546-1-agordeev@linux.ibm.com Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Suggested-by: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999
|
|
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*
|
|
* Derived from "include/asm-i386/io.h"
|
|
*/
|
|
|
|
#ifndef _S390_IO_H
|
|
#define _S390_IO_H
|
|
|
|
#include <linux/kernel.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pci_io.h>
|
|
|
|
#define xlate_dev_mem_ptr xlate_dev_mem_ptr
|
|
#define kc_xlate_dev_mem_ptr xlate_dev_mem_ptr
|
|
void *xlate_dev_mem_ptr(phys_addr_t phys);
|
|
#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
|
|
#define kc_unxlate_dev_mem_ptr unxlate_dev_mem_ptr
|
|
void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
|
|
|
|
#define IO_SPACE_LIMIT 0
|
|
|
|
/*
|
|
* I/O memory mapping functions.
|
|
*/
|
|
#define ioremap_prot ioremap_prot
|
|
#define iounmap iounmap
|
|
|
|
#define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL)
|
|
|
|
#define ioremap_wc(addr, size) \
|
|
ioremap_prot((addr), (size), pgprot_val(pgprot_writecombine(PAGE_KERNEL)))
|
|
#define ioremap_wt(addr, size) \
|
|
ioremap_prot((addr), (size), pgprot_val(pgprot_writethrough(PAGE_KERNEL)))
|
|
|
|
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void ioport_unmap(void __iomem *p)
|
|
{
|
|
}
|
|
|
|
#ifdef CONFIG_PCI
|
|
|
|
/*
|
|
* s390 needs a private implementation of pci_iomap since ioremap with its
|
|
* offset parameter isn't sufficient. That's because BAR spaces are not
|
|
* disjunctive on s390 so we need the bar parameter of pci_iomap to find
|
|
* the corresponding device and create the mapping cookie.
|
|
*/
|
|
#define pci_iomap pci_iomap
|
|
#define pci_iomap_range pci_iomap_range
|
|
#define pci_iounmap pci_iounmap
|
|
#define pci_iomap_wc pci_iomap_wc
|
|
#define pci_iomap_wc_range pci_iomap_wc_range
|
|
|
|
#define memcpy_fromio(dst, src, count) zpci_memcpy_fromio(dst, src, count)
|
|
#define memcpy_toio(dst, src, count) zpci_memcpy_toio(dst, src, count)
|
|
#define memset_io(dst, val, count) zpci_memset_io(dst, val, count)
|
|
|
|
#define mmiowb() zpci_barrier()
|
|
|
|
#define __raw_readb zpci_read_u8
|
|
#define __raw_readw zpci_read_u16
|
|
#define __raw_readl zpci_read_u32
|
|
#define __raw_readq zpci_read_u64
|
|
#define __raw_writeb zpci_write_u8
|
|
#define __raw_writew zpci_write_u16
|
|
#define __raw_writel zpci_write_u32
|
|
#define __raw_writeq zpci_write_u64
|
|
|
|
/* combine single writes by using store-block insn */
|
|
static inline void __iowrite32_copy(void __iomem *to, const void *from,
|
|
size_t count)
|
|
{
|
|
zpci_memcpy_toio(to, from, count * 4);
|
|
}
|
|
#define __iowrite32_copy __iowrite32_copy
|
|
|
|
static inline void __iowrite64_copy(void __iomem *to, const void *from,
|
|
size_t count)
|
|
{
|
|
zpci_memcpy_toio(to, from, count * 8);
|
|
}
|
|
#define __iowrite64_copy __iowrite64_copy
|
|
|
|
#endif /* CONFIG_PCI */
|
|
|
|
#include <asm-generic/io.h>
|
|
|
|
#endif
|