mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 06:55:13 +08:00
c953cc987a
Use clear_mce_nospec() to restore WB mode for the kernel linear mapping of a pmem page that was marked 'HWPoison'. A page with 'HWPoison' set has also been marked UC in PAT (page attribute table) via set_mce_nospec() to prevent speculative retrievals of poison. The 'HWPoison' flag is only cleared when overwriting an entire page. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Dave Jiang <dave.jiang@intel.com>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __NVDIMM_PMEM_H__
|
|
#define __NVDIMM_PMEM_H__
|
|
#include <linux/page-flags.h>
|
|
#include <linux/badblocks.h>
|
|
#include <linux/types.h>
|
|
#include <linux/pfn_t.h>
|
|
#include <linux/fs.h>
|
|
|
|
/* this definition is in it's own header for tools/testing/nvdimm to consume */
|
|
struct pmem_device {
|
|
/* One contiguous memory region per device */
|
|
phys_addr_t phys_addr;
|
|
/* when non-zero this device is hosting a 'pfn' instance */
|
|
phys_addr_t data_offset;
|
|
u64 pfn_flags;
|
|
void *virt_addr;
|
|
/* immutable base size of the namespace */
|
|
size_t size;
|
|
/* trim size when namespace capacity has been section aligned */
|
|
u32 pfn_pad;
|
|
struct kernfs_node *bb_state;
|
|
struct badblocks bb;
|
|
struct dax_device *dax_dev;
|
|
struct gendisk *disk;
|
|
struct dev_pagemap pgmap;
|
|
};
|
|
|
|
long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
|
|
long nr_pages, void **kaddr, pfn_t *pfn);
|
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
static inline bool test_and_clear_pmem_poison(struct page *page)
|
|
{
|
|
return TestClearPageHWPoison(page);
|
|
}
|
|
#else
|
|
static inline bool test_and_clear_pmem_poison(struct page *page)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
#endif /* __NVDIMM_PMEM_H__ */
|