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https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-24 20:54:10 +08:00
6614a3c316
Lin, Yang Shi, Anshuman Khandual and Mike Rapoport - Some kmemleak fixes from Patrick Wang and Waiman Long - DAMON updates from SeongJae Park - memcg debug/visibility work from Roman Gushchin - vmalloc speedup from Uladzislau Rezki - more folio conversion work from Matthew Wilcox - enhancements for coherent device memory mapping from Alex Sierra - addition of shared pages tracking and CoW support for fsdax, from Shiyang Ruan - hugetlb optimizations from Mike Kravetz - Mel Gorman has contributed some pagealloc changes to improve latency and realtime behaviour. - mprotect soft-dirty checking has been improved by Peter Xu - Many other singleton patches all over the place -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTTMBEPP41GrTpTJgfdBJ7gKXxAjgUCYuravgAKCRDdBJ7gKXxA jpqSAQDrXSdII+ht9kSHlaCVYjqRFQz/rRvURQrWQV74f6aeiAD+NHHeDPwZn11/ SPktqEUrF1pxnGQxqLh1kUFUhsVZQgE= =w/UH -----END PGP SIGNATURE----- Merge tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull MM updates from Andrew Morton: "Most of the MM queue. A few things are still pending. Liam's maple tree rework didn't make it. This has resulted in a few other minor patch series being held over for next time. Multi-gen LRU still isn't merged as we were waiting for mapletree to stabilize. The current plan is to merge MGLRU into -mm soon and to later reintroduce mapletree, with a view to hopefully getting both into 6.1-rc1. Summary: - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe Lin, Yang Shi, Anshuman Khandual and Mike Rapoport - Some kmemleak fixes from Patrick Wang and Waiman Long - DAMON updates from SeongJae Park - memcg debug/visibility work from Roman Gushchin - vmalloc speedup from Uladzislau Rezki - more folio conversion work from Matthew Wilcox - enhancements for coherent device memory mapping from Alex Sierra - addition of shared pages tracking and CoW support for fsdax, from Shiyang Ruan - hugetlb optimizations from Mike Kravetz - Mel Gorman has contributed some pagealloc changes to improve latency and realtime behaviour. - mprotect soft-dirty checking has been improved by Peter Xu - Many other singleton patches all over the place" [ XFS merge from hell as per Darrick Wong in https://lore.kernel.org/all/YshKnxb4VwXycPO8@magnolia/ ] * tag 'mm-stable-2022-08-03' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (282 commits) tools/testing/selftests/vm/hmm-tests.c: fix build mm: Kconfig: fix typo mm: memory-failure: convert to pr_fmt() mm: use is_zone_movable_page() helper hugetlbfs: fix inaccurate comment in hugetlbfs_statfs() hugetlbfs: cleanup some comments in inode.c hugetlbfs: remove unneeded header file hugetlbfs: remove unneeded hugetlbfs_ops forward declaration hugetlbfs: use helper macro SZ_1{K,M} mm: cleanup is_highmem() mm/hmm: add a test for cross device private faults selftests: add soft-dirty into run_vmtests.sh selftests: soft-dirty: add test for mprotect mm/mprotect: fix soft-dirty check in can_change_pte_writable() mm: memcontrol: fix potential oom_lock recursion deadlock mm/gup.c: fix formatting in check_and_migrate_movable_page() xfs: fail dax mount if reflink is enabled on a partition mm/memcontrol.c: remove the redundant updating of stats_flush_threshold userfaultfd: don't fail on unrecognized features hugetlb_cgroup: fix wrong hugetlb cgroup numa stat ...
790 lines
20 KiB
C
790 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Persistent Memory Driver
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*
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* Copyright (c) 2014-2015, Intel Corporation.
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* Copyright (c) 2015, Christoph Hellwig <hch@lst.de>.
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* Copyright (c) 2015, Boaz Harrosh <boaz@plexistor.com>.
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*/
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#include <linux/blkdev.h>
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#include <linux/pagemap.h>
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#include <linux/hdreg.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/set_memory.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/badblocks.h>
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#include <linux/memremap.h>
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#include <linux/vmalloc.h>
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#include <linux/blk-mq.h>
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#include <linux/pfn_t.h>
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#include <linux/slab.h>
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#include <linux/uio.h>
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#include <linux/dax.h>
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#include <linux/nd.h>
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#include <linux/mm.h>
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#include <asm/cacheflush.h>
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#include "pmem.h"
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#include "btt.h"
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#include "pfn.h"
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#include "nd.h"
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static struct device *to_dev(struct pmem_device *pmem)
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{
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/*
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* nvdimm bus services need a 'dev' parameter, and we record the device
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* at init in bb.dev.
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*/
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return pmem->bb.dev;
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}
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static struct nd_region *to_region(struct pmem_device *pmem)
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{
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return to_nd_region(to_dev(pmem)->parent);
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}
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static phys_addr_t to_phys(struct pmem_device *pmem, phys_addr_t offset)
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{
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return pmem->phys_addr + offset;
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}
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static sector_t to_sect(struct pmem_device *pmem, phys_addr_t offset)
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{
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return (offset - pmem->data_offset) >> SECTOR_SHIFT;
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}
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static phys_addr_t to_offset(struct pmem_device *pmem, sector_t sector)
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{
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return (sector << SECTOR_SHIFT) + pmem->data_offset;
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}
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static void pmem_mkpage_present(struct pmem_device *pmem, phys_addr_t offset,
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unsigned int len)
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{
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phys_addr_t phys = to_phys(pmem, offset);
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unsigned long pfn_start, pfn_end, pfn;
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/* only pmem in the linear map supports HWPoison */
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if (is_vmalloc_addr(pmem->virt_addr))
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return;
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pfn_start = PHYS_PFN(phys);
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pfn_end = pfn_start + PHYS_PFN(len);
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for (pfn = pfn_start; pfn < pfn_end; pfn++) {
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struct page *page = pfn_to_page(pfn);
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/*
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* Note, no need to hold a get_dev_pagemap() reference
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* here since we're in the driver I/O path and
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* outstanding I/O requests pin the dev_pagemap.
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*/
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if (test_and_clear_pmem_poison(page))
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clear_mce_nospec(pfn);
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}
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}
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static void pmem_clear_bb(struct pmem_device *pmem, sector_t sector, long blks)
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{
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if (blks == 0)
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return;
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badblocks_clear(&pmem->bb, sector, blks);
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if (pmem->bb_state)
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sysfs_notify_dirent(pmem->bb_state);
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}
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static long __pmem_clear_poison(struct pmem_device *pmem,
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phys_addr_t offset, unsigned int len)
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{
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phys_addr_t phys = to_phys(pmem, offset);
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long cleared = nvdimm_clear_poison(to_dev(pmem), phys, len);
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if (cleared > 0) {
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pmem_mkpage_present(pmem, offset, cleared);
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arch_invalidate_pmem(pmem->virt_addr + offset, len);
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}
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return cleared;
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}
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static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
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phys_addr_t offset, unsigned int len)
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{
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long cleared = __pmem_clear_poison(pmem, offset, len);
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if (cleared < 0)
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return BLK_STS_IOERR;
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pmem_clear_bb(pmem, to_sect(pmem, offset), cleared >> SECTOR_SHIFT);
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if (cleared < len)
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return BLK_STS_IOERR;
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return BLK_STS_OK;
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}
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static void write_pmem(void *pmem_addr, struct page *page,
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unsigned int off, unsigned int len)
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{
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unsigned int chunk;
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void *mem;
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while (len) {
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mem = kmap_atomic(page);
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chunk = min_t(unsigned int, len, PAGE_SIZE - off);
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memcpy_flushcache(pmem_addr, mem + off, chunk);
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kunmap_atomic(mem);
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len -= chunk;
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off = 0;
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page++;
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pmem_addr += chunk;
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}
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}
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static blk_status_t read_pmem(struct page *page, unsigned int off,
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void *pmem_addr, unsigned int len)
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{
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unsigned int chunk;
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unsigned long rem;
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void *mem;
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while (len) {
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mem = kmap_atomic(page);
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chunk = min_t(unsigned int, len, PAGE_SIZE - off);
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rem = copy_mc_to_kernel(mem + off, pmem_addr, chunk);
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kunmap_atomic(mem);
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if (rem)
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return BLK_STS_IOERR;
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len -= chunk;
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off = 0;
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page++;
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pmem_addr += chunk;
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}
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return BLK_STS_OK;
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}
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static blk_status_t pmem_do_read(struct pmem_device *pmem,
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struct page *page, unsigned int page_off,
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sector_t sector, unsigned int len)
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{
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blk_status_t rc;
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phys_addr_t pmem_off = to_offset(pmem, sector);
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void *pmem_addr = pmem->virt_addr + pmem_off;
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if (unlikely(is_bad_pmem(&pmem->bb, sector, len)))
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return BLK_STS_IOERR;
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rc = read_pmem(page, page_off, pmem_addr, len);
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flush_dcache_page(page);
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return rc;
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}
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static blk_status_t pmem_do_write(struct pmem_device *pmem,
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struct page *page, unsigned int page_off,
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sector_t sector, unsigned int len)
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{
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phys_addr_t pmem_off = to_offset(pmem, sector);
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void *pmem_addr = pmem->virt_addr + pmem_off;
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if (unlikely(is_bad_pmem(&pmem->bb, sector, len))) {
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blk_status_t rc = pmem_clear_poison(pmem, pmem_off, len);
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if (rc != BLK_STS_OK)
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return rc;
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}
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flush_dcache_page(page);
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write_pmem(pmem_addr, page, page_off, len);
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return BLK_STS_OK;
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}
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static void pmem_submit_bio(struct bio *bio)
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{
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int ret = 0;
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blk_status_t rc = 0;
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bool do_acct;
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unsigned long start;
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struct bio_vec bvec;
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struct bvec_iter iter;
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struct pmem_device *pmem = bio->bi_bdev->bd_disk->private_data;
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struct nd_region *nd_region = to_region(pmem);
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if (bio->bi_opf & REQ_PREFLUSH)
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ret = nvdimm_flush(nd_region, bio);
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do_acct = blk_queue_io_stat(bio->bi_bdev->bd_disk->queue);
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if (do_acct)
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start = bio_start_io_acct(bio);
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bio_for_each_segment(bvec, bio, iter) {
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if (op_is_write(bio_op(bio)))
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rc = pmem_do_write(pmem, bvec.bv_page, bvec.bv_offset,
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iter.bi_sector, bvec.bv_len);
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else
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rc = pmem_do_read(pmem, bvec.bv_page, bvec.bv_offset,
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iter.bi_sector, bvec.bv_len);
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if (rc) {
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bio->bi_status = rc;
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break;
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}
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}
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if (do_acct)
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bio_end_io_acct(bio, start);
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if (bio->bi_opf & REQ_FUA)
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ret = nvdimm_flush(nd_region, bio);
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if (ret)
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bio->bi_status = errno_to_blk_status(ret);
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bio_endio(bio);
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}
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static int pmem_rw_page(struct block_device *bdev, sector_t sector,
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struct page *page, enum req_op op)
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{
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struct pmem_device *pmem = bdev->bd_disk->private_data;
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blk_status_t rc;
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if (op_is_write(op))
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rc = pmem_do_write(pmem, page, 0, sector, thp_size(page));
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else
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rc = pmem_do_read(pmem, page, 0, sector, thp_size(page));
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/*
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* The ->rw_page interface is subtle and tricky. The core
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* retries on any error, so we can only invoke page_endio() in
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* the successful completion case. Otherwise, we'll see crashes
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* caused by double completion.
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*/
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if (rc == 0)
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page_endio(page, op_is_write(op), 0);
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return blk_status_to_errno(rc);
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}
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/* see "strong" declaration in tools/testing/nvdimm/pmem-dax.c */
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__weak long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
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long nr_pages, enum dax_access_mode mode, void **kaddr,
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pfn_t *pfn)
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{
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resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
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sector_t sector = PFN_PHYS(pgoff) >> SECTOR_SHIFT;
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unsigned int num = PFN_PHYS(nr_pages) >> SECTOR_SHIFT;
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struct badblocks *bb = &pmem->bb;
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sector_t first_bad;
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int num_bad;
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if (kaddr)
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*kaddr = pmem->virt_addr + offset;
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if (pfn)
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*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
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if (bb->count &&
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badblocks_check(bb, sector, num, &first_bad, &num_bad)) {
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long actual_nr;
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if (mode != DAX_RECOVERY_WRITE)
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return -EIO;
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/*
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* Set the recovery stride is set to kernel page size because
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* the underlying driver and firmware clear poison functions
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* don't appear to handle large chunk(such as 2MiB) reliably.
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*/
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actual_nr = PHYS_PFN(
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PAGE_ALIGN((first_bad - sector) << SECTOR_SHIFT));
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dev_dbg(pmem->bb.dev, "start sector(%llu), nr_pages(%ld), first_bad(%llu), actual_nr(%ld)\n",
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sector, nr_pages, first_bad, actual_nr);
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if (actual_nr)
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return actual_nr;
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return 1;
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}
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/*
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* If badblocks are present but not in the range, limit known good range
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* to the requested range.
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*/
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if (bb->count)
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return nr_pages;
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return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
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}
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static const struct block_device_operations pmem_fops = {
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.owner = THIS_MODULE,
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.submit_bio = pmem_submit_bio,
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.rw_page = pmem_rw_page,
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};
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static int pmem_dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
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size_t nr_pages)
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{
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struct pmem_device *pmem = dax_get_private(dax_dev);
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return blk_status_to_errno(pmem_do_write(pmem, ZERO_PAGE(0), 0,
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PFN_PHYS(pgoff) >> SECTOR_SHIFT,
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PAGE_SIZE));
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}
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static long pmem_dax_direct_access(struct dax_device *dax_dev,
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pgoff_t pgoff, long nr_pages, enum dax_access_mode mode,
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void **kaddr, pfn_t *pfn)
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{
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struct pmem_device *pmem = dax_get_private(dax_dev);
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return __pmem_direct_access(pmem, pgoff, nr_pages, mode, kaddr, pfn);
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}
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/*
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* The recovery write thread started out as a normal pwrite thread and
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* when the filesystem was told about potential media error in the
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* range, filesystem turns the normal pwrite to a dax_recovery_write.
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*
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* The recovery write consists of clearing media poison, clearing page
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* HWPoison bit, reenable page-wide read-write permission, flush the
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* caches and finally write. A competing pread thread will be held
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* off during the recovery process since data read back might not be
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* valid, and this is achieved by clearing the badblock records after
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* the recovery write is complete. Competing recovery write threads
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* are already serialized by writer lock held by dax_iomap_rw().
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*/
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static size_t pmem_recovery_write(struct dax_device *dax_dev, pgoff_t pgoff,
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void *addr, size_t bytes, struct iov_iter *i)
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{
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struct pmem_device *pmem = dax_get_private(dax_dev);
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size_t olen, len, off;
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phys_addr_t pmem_off;
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struct device *dev = pmem->bb.dev;
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long cleared;
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off = offset_in_page(addr);
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len = PFN_PHYS(PFN_UP(off + bytes));
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if (!is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) >> SECTOR_SHIFT, len))
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return _copy_from_iter_flushcache(addr, bytes, i);
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/*
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* Not page-aligned range cannot be recovered. This should not
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* happen unless something else went wrong.
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*/
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if (off || !PAGE_ALIGNED(bytes)) {
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dev_dbg(dev, "Found poison, but addr(%p) or bytes(%#zx) not page aligned\n",
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addr, bytes);
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return 0;
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}
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pmem_off = PFN_PHYS(pgoff) + pmem->data_offset;
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cleared = __pmem_clear_poison(pmem, pmem_off, len);
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if (cleared > 0 && cleared < len) {
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dev_dbg(dev, "poison cleared only %ld out of %zu bytes\n",
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cleared, len);
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return 0;
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}
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if (cleared < 0) {
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dev_dbg(dev, "poison clear failed: %ld\n", cleared);
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return 0;
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}
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olen = _copy_from_iter_flushcache(addr, bytes, i);
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pmem_clear_bb(pmem, to_sect(pmem, pmem_off), cleared >> SECTOR_SHIFT);
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return olen;
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}
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static const struct dax_operations pmem_dax_ops = {
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.direct_access = pmem_dax_direct_access,
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.zero_page_range = pmem_dax_zero_page_range,
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.recovery_write = pmem_recovery_write,
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};
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static ssize_t write_cache_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct pmem_device *pmem = dev_to_disk(dev)->private_data;
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return sprintf(buf, "%d\n", !!dax_write_cache_enabled(pmem->dax_dev));
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}
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static ssize_t write_cache_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct pmem_device *pmem = dev_to_disk(dev)->private_data;
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bool write_cache;
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int rc;
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rc = strtobool(buf, &write_cache);
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if (rc)
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return rc;
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dax_write_cache(pmem->dax_dev, write_cache);
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return len;
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}
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static DEVICE_ATTR_RW(write_cache);
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static umode_t dax_visible(struct kobject *kobj, struct attribute *a, int n)
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{
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#ifndef CONFIG_ARCH_HAS_PMEM_API
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|
if (a == &dev_attr_write_cache.attr)
|
|
return 0;
|
|
#endif
|
|
return a->mode;
|
|
}
|
|
|
|
static struct attribute *dax_attributes[] = {
|
|
&dev_attr_write_cache.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group dax_attribute_group = {
|
|
.name = "dax",
|
|
.attrs = dax_attributes,
|
|
.is_visible = dax_visible,
|
|
};
|
|
|
|
static const struct attribute_group *pmem_attribute_groups[] = {
|
|
&dax_attribute_group,
|
|
NULL,
|
|
};
|
|
|
|
static void pmem_release_disk(void *__pmem)
|
|
{
|
|
struct pmem_device *pmem = __pmem;
|
|
|
|
dax_remove_host(pmem->disk);
|
|
kill_dax(pmem->dax_dev);
|
|
put_dax(pmem->dax_dev);
|
|
del_gendisk(pmem->disk);
|
|
|
|
put_disk(pmem->disk);
|
|
}
|
|
|
|
static int pmem_pagemap_memory_failure(struct dev_pagemap *pgmap,
|
|
unsigned long pfn, unsigned long nr_pages, int mf_flags)
|
|
{
|
|
struct pmem_device *pmem =
|
|
container_of(pgmap, struct pmem_device, pgmap);
|
|
u64 offset = PFN_PHYS(pfn) - pmem->phys_addr - pmem->data_offset;
|
|
u64 len = nr_pages << PAGE_SHIFT;
|
|
|
|
return dax_holder_notify_failure(pmem->dax_dev, offset, len, mf_flags);
|
|
}
|
|
|
|
static const struct dev_pagemap_ops fsdax_pagemap_ops = {
|
|
.memory_failure = pmem_pagemap_memory_failure,
|
|
};
|
|
|
|
static int pmem_attach_disk(struct device *dev,
|
|
struct nd_namespace_common *ndns)
|
|
{
|
|
struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev);
|
|
struct nd_region *nd_region = to_nd_region(dev->parent);
|
|
int nid = dev_to_node(dev), fua;
|
|
struct resource *res = &nsio->res;
|
|
struct range bb_range;
|
|
struct nd_pfn *nd_pfn = NULL;
|
|
struct dax_device *dax_dev;
|
|
struct nd_pfn_sb *pfn_sb;
|
|
struct pmem_device *pmem;
|
|
struct request_queue *q;
|
|
struct gendisk *disk;
|
|
void *addr;
|
|
int rc;
|
|
|
|
pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
|
|
if (!pmem)
|
|
return -ENOMEM;
|
|
|
|
rc = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* while nsio_rw_bytes is active, parse a pfn info block if present */
|
|
if (is_nd_pfn(dev)) {
|
|
nd_pfn = to_nd_pfn(dev);
|
|
rc = nvdimm_setup_pfn(nd_pfn, &pmem->pgmap);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
/* we're attaching a block device, disable raw namespace access */
|
|
devm_namespace_disable(dev, ndns);
|
|
|
|
dev_set_drvdata(dev, pmem);
|
|
pmem->phys_addr = res->start;
|
|
pmem->size = resource_size(res);
|
|
fua = nvdimm_has_flush(nd_region);
|
|
if (!IS_ENABLED(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) || fua < 0) {
|
|
dev_warn(dev, "unable to guarantee persistence of writes\n");
|
|
fua = 0;
|
|
}
|
|
|
|
if (!devm_request_mem_region(dev, res->start, resource_size(res),
|
|
dev_name(&ndns->dev))) {
|
|
dev_warn(dev, "could not reserve region %pR\n", res);
|
|
return -EBUSY;
|
|
}
|
|
|
|
disk = blk_alloc_disk(nid);
|
|
if (!disk)
|
|
return -ENOMEM;
|
|
q = disk->queue;
|
|
|
|
pmem->disk = disk;
|
|
pmem->pgmap.owner = pmem;
|
|
pmem->pfn_flags = PFN_DEV;
|
|
if (is_nd_pfn(dev)) {
|
|
pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
|
|
pmem->pgmap.ops = &fsdax_pagemap_ops;
|
|
addr = devm_memremap_pages(dev, &pmem->pgmap);
|
|
pfn_sb = nd_pfn->pfn_sb;
|
|
pmem->data_offset = le64_to_cpu(pfn_sb->dataoff);
|
|
pmem->pfn_pad = resource_size(res) -
|
|
range_len(&pmem->pgmap.range);
|
|
pmem->pfn_flags |= PFN_MAP;
|
|
bb_range = pmem->pgmap.range;
|
|
bb_range.start += pmem->data_offset;
|
|
} else if (pmem_should_map_pages(dev)) {
|
|
pmem->pgmap.range.start = res->start;
|
|
pmem->pgmap.range.end = res->end;
|
|
pmem->pgmap.nr_range = 1;
|
|
pmem->pgmap.type = MEMORY_DEVICE_FS_DAX;
|
|
pmem->pgmap.ops = &fsdax_pagemap_ops;
|
|
addr = devm_memremap_pages(dev, &pmem->pgmap);
|
|
pmem->pfn_flags |= PFN_MAP;
|
|
bb_range = pmem->pgmap.range;
|
|
} else {
|
|
addr = devm_memremap(dev, pmem->phys_addr,
|
|
pmem->size, ARCH_MEMREMAP_PMEM);
|
|
bb_range.start = res->start;
|
|
bb_range.end = res->end;
|
|
}
|
|
|
|
if (IS_ERR(addr)) {
|
|
rc = PTR_ERR(addr);
|
|
goto out;
|
|
}
|
|
pmem->virt_addr = addr;
|
|
|
|
blk_queue_write_cache(q, true, fua);
|
|
blk_queue_physical_block_size(q, PAGE_SIZE);
|
|
blk_queue_logical_block_size(q, pmem_sector_size(ndns));
|
|
blk_queue_max_hw_sectors(q, UINT_MAX);
|
|
blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
|
|
if (pmem->pfn_flags & PFN_MAP)
|
|
blk_queue_flag_set(QUEUE_FLAG_DAX, q);
|
|
|
|
disk->fops = &pmem_fops;
|
|
disk->private_data = pmem;
|
|
nvdimm_namespace_disk_name(ndns, disk->disk_name);
|
|
set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
|
|
/ 512);
|
|
if (devm_init_badblocks(dev, &pmem->bb))
|
|
return -ENOMEM;
|
|
nvdimm_badblocks_populate(nd_region, &pmem->bb, &bb_range);
|
|
disk->bb = &pmem->bb;
|
|
|
|
dax_dev = alloc_dax(pmem, &pmem_dax_ops);
|
|
if (IS_ERR(dax_dev)) {
|
|
rc = PTR_ERR(dax_dev);
|
|
goto out;
|
|
}
|
|
set_dax_nocache(dax_dev);
|
|
set_dax_nomc(dax_dev);
|
|
if (is_nvdimm_sync(nd_region))
|
|
set_dax_synchronous(dax_dev);
|
|
rc = dax_add_host(dax_dev, disk);
|
|
if (rc)
|
|
goto out_cleanup_dax;
|
|
dax_write_cache(dax_dev, nvdimm_has_cache(nd_region));
|
|
pmem->dax_dev = dax_dev;
|
|
|
|
rc = device_add_disk(dev, disk, pmem_attribute_groups);
|
|
if (rc)
|
|
goto out_remove_host;
|
|
if (devm_add_action_or_reset(dev, pmem_release_disk, pmem))
|
|
return -ENOMEM;
|
|
|
|
nvdimm_check_and_set_ro(disk);
|
|
|
|
pmem->bb_state = sysfs_get_dirent(disk_to_dev(disk)->kobj.sd,
|
|
"badblocks");
|
|
if (!pmem->bb_state)
|
|
dev_warn(dev, "'badblocks' notification disabled\n");
|
|
return 0;
|
|
|
|
out_remove_host:
|
|
dax_remove_host(pmem->disk);
|
|
out_cleanup_dax:
|
|
kill_dax(pmem->dax_dev);
|
|
put_dax(pmem->dax_dev);
|
|
out:
|
|
put_disk(pmem->disk);
|
|
return rc;
|
|
}
|
|
|
|
static int nd_pmem_probe(struct device *dev)
|
|
{
|
|
int ret;
|
|
struct nd_namespace_common *ndns;
|
|
|
|
ndns = nvdimm_namespace_common_probe(dev);
|
|
if (IS_ERR(ndns))
|
|
return PTR_ERR(ndns);
|
|
|
|
if (is_nd_btt(dev))
|
|
return nvdimm_namespace_attach_btt(ndns);
|
|
|
|
if (is_nd_pfn(dev))
|
|
return pmem_attach_disk(dev, ndns);
|
|
|
|
ret = devm_namespace_enable(dev, ndns, nd_info_block_reserve());
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = nd_btt_probe(dev, ndns);
|
|
if (ret == 0)
|
|
return -ENXIO;
|
|
|
|
/*
|
|
* We have two failure conditions here, there is no
|
|
* info reserver block or we found a valid info reserve block
|
|
* but failed to initialize the pfn superblock.
|
|
*
|
|
* For the first case consider namespace as a raw pmem namespace
|
|
* and attach a disk.
|
|
*
|
|
* For the latter, consider this a success and advance the namespace
|
|
* seed.
|
|
*/
|
|
ret = nd_pfn_probe(dev, ndns);
|
|
if (ret == 0)
|
|
return -ENXIO;
|
|
else if (ret == -EOPNOTSUPP)
|
|
return ret;
|
|
|
|
ret = nd_dax_probe(dev, ndns);
|
|
if (ret == 0)
|
|
return -ENXIO;
|
|
else if (ret == -EOPNOTSUPP)
|
|
return ret;
|
|
|
|
/* probe complete, attach handles namespace enabling */
|
|
devm_namespace_disable(dev, ndns);
|
|
|
|
return pmem_attach_disk(dev, ndns);
|
|
}
|
|
|
|
static void nd_pmem_remove(struct device *dev)
|
|
{
|
|
struct pmem_device *pmem = dev_get_drvdata(dev);
|
|
|
|
if (is_nd_btt(dev))
|
|
nvdimm_namespace_detach_btt(to_nd_btt(dev));
|
|
else {
|
|
/*
|
|
* Note, this assumes device_lock() context to not
|
|
* race nd_pmem_notify()
|
|
*/
|
|
sysfs_put(pmem->bb_state);
|
|
pmem->bb_state = NULL;
|
|
}
|
|
nvdimm_flush(to_nd_region(dev->parent), NULL);
|
|
}
|
|
|
|
static void nd_pmem_shutdown(struct device *dev)
|
|
{
|
|
nvdimm_flush(to_nd_region(dev->parent), NULL);
|
|
}
|
|
|
|
static void pmem_revalidate_poison(struct device *dev)
|
|
{
|
|
struct nd_region *nd_region;
|
|
resource_size_t offset = 0, end_trunc = 0;
|
|
struct nd_namespace_common *ndns;
|
|
struct nd_namespace_io *nsio;
|
|
struct badblocks *bb;
|
|
struct range range;
|
|
struct kernfs_node *bb_state;
|
|
|
|
if (is_nd_btt(dev)) {
|
|
struct nd_btt *nd_btt = to_nd_btt(dev);
|
|
|
|
ndns = nd_btt->ndns;
|
|
nd_region = to_nd_region(ndns->dev.parent);
|
|
nsio = to_nd_namespace_io(&ndns->dev);
|
|
bb = &nsio->bb;
|
|
bb_state = NULL;
|
|
} else {
|
|
struct pmem_device *pmem = dev_get_drvdata(dev);
|
|
|
|
nd_region = to_region(pmem);
|
|
bb = &pmem->bb;
|
|
bb_state = pmem->bb_state;
|
|
|
|
if (is_nd_pfn(dev)) {
|
|
struct nd_pfn *nd_pfn = to_nd_pfn(dev);
|
|
struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
|
|
|
|
ndns = nd_pfn->ndns;
|
|
offset = pmem->data_offset +
|
|
__le32_to_cpu(pfn_sb->start_pad);
|
|
end_trunc = __le32_to_cpu(pfn_sb->end_trunc);
|
|
} else {
|
|
ndns = to_ndns(dev);
|
|
}
|
|
|
|
nsio = to_nd_namespace_io(&ndns->dev);
|
|
}
|
|
|
|
range.start = nsio->res.start + offset;
|
|
range.end = nsio->res.end - end_trunc;
|
|
nvdimm_badblocks_populate(nd_region, bb, &range);
|
|
if (bb_state)
|
|
sysfs_notify_dirent(bb_state);
|
|
}
|
|
|
|
static void pmem_revalidate_region(struct device *dev)
|
|
{
|
|
struct pmem_device *pmem;
|
|
|
|
if (is_nd_btt(dev)) {
|
|
struct nd_btt *nd_btt = to_nd_btt(dev);
|
|
struct btt *btt = nd_btt->btt;
|
|
|
|
nvdimm_check_and_set_ro(btt->btt_disk);
|
|
return;
|
|
}
|
|
|
|
pmem = dev_get_drvdata(dev);
|
|
nvdimm_check_and_set_ro(pmem->disk);
|
|
}
|
|
|
|
static void nd_pmem_notify(struct device *dev, enum nvdimm_event event)
|
|
{
|
|
switch (event) {
|
|
case NVDIMM_REVALIDATE_POISON:
|
|
pmem_revalidate_poison(dev);
|
|
break;
|
|
case NVDIMM_REVALIDATE_REGION:
|
|
pmem_revalidate_region(dev);
|
|
break;
|
|
default:
|
|
dev_WARN_ONCE(dev, 1, "notify: unknown event: %d\n", event);
|
|
break;
|
|
}
|
|
}
|
|
|
|
MODULE_ALIAS("pmem");
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_IO);
|
|
MODULE_ALIAS_ND_DEVICE(ND_DEVICE_NAMESPACE_PMEM);
|
|
static struct nd_device_driver nd_pmem_driver = {
|
|
.probe = nd_pmem_probe,
|
|
.remove = nd_pmem_remove,
|
|
.notify = nd_pmem_notify,
|
|
.shutdown = nd_pmem_shutdown,
|
|
.drv = {
|
|
.name = "nd_pmem",
|
|
},
|
|
.type = ND_DRIVER_NAMESPACE_IO | ND_DRIVER_NAMESPACE_PMEM,
|
|
};
|
|
|
|
module_nd_driver(nd_pmem_driver);
|
|
|
|
MODULE_AUTHOR("Ross Zwisler <ross.zwisler@linux.intel.com>");
|
|
MODULE_LICENSE("GPL v2");
|