From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: [PATCH 10/11] mm, memory_failure: teach memory_failure() about dev_pagemap pages From: Dan Williams To: linux-nvdimm@lists.01.org Cc: Jan Kara , Christoph Hellwig , =?utf-8?b?SsOpcsO0bWU=?= Glisse , Matthew Wilcox , Naoya Horiguchi , Ross Zwisler , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, tony.luck@intel.com Date: Tue, 22 May 2018 07:40:24 -0700 Message-ID: <152700002461.24093.13281217260996107277.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <152699997165.24093.12194490924829406111.stgit@dwillia2-desk3.amr.corp.intel.com> References: <152699997165.24093.12194490924829406111.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: mce: Uncorrected hardware memory error in user-access at af34214200 {1}[Hardware Error]: It has been corrected by h/w and requires no further action mce: [Hardware Error]: Machine check events logged {1}[Hardware Error]: event severity: corrected Memory failure: 0xaf34214: reserved kernel page still referenced by 1 users [..] Memory failure: 0xaf34214: recovery action for reserved kernel page: Failed mce: Memory error not recovered In contrast to typical memory, dev_pagemap pages may be dax mapped. With dax there is no possibility to map in another page dynamically since dax establishes 1:1 physical address to file offset associations. Also dev_pagemap pages associated with NVDIMM / persistent memory devices can internal remap/repair addresses with poison. While memory_failure() assumes that it can discard typical poisoned pages and keep them unmapped indefinitely, dev_pagemap pages may be returned to service after the error is cleared. Teach memory_failure() to detect and handle MEMORY_DEVICE_HOST dev_pagemap pages that have poison consumed by userspace. Mark the memory as UC instead of unmapping it completely to allow ongoing access via the device driver (nd_pmem). Later, nd_pmem will grow support for marking the page back to WB when the error is cleared. Cc: Jan Kara Cc: Christoph Hellwig Cc: Jérôme Glisse Cc: Matthew Wilcox Cc: Naoya Horiguchi Cc: Ross Zwisler Signed-off-by: Dan Williams --- mm/memory-failure.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 42a193ee14d3..f95036f99a79 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -55,6 +55,7 @@ #include #include #include +#include #include #include #include "internal.h" @@ -1112,6 +1113,117 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags) return res; } +static unsigned long dax_mapping_size(struct page *page) +{ + struct address_space *mapping = page->mapping; + pgoff_t pgoff = page_to_pgoff(page); + struct vm_area_struct *vma; + unsigned long size = 0; + + i_mmap_lock_read(mapping); + vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) { + unsigned long address = vma_address(page, vma); + pgd_t *pgd; + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + + pgd = pgd_offset(vma->vm_mm, address); + if (!pgd_present(*pgd)) + continue; + p4d = p4d_offset(pgd, address); + if (!p4d_present(*p4d)) + continue; + pud = pud_offset(p4d, address); + if (!pud_present(*pud)) + continue; + if (pud_devmap(*pud)) { + size = PUD_SIZE; + break; + } + pmd = pmd_offset(pud, address); + if (!pmd_present(*pmd)) + continue; + if (pmd_devmap(*pmd)) { + size = PMD_SIZE; + break; + } + pte = pte_offset_map(pmd, address); + if (!pte_present(*pte)) + continue; + if (pte_devmap(*pte)) { + size = PAGE_SIZE; + break; + } + } + i_mmap_unlock_read(mapping); + return size; +} + +static int memory_failure_dev_pagemap(unsigned long pfn, int flags, + struct dev_pagemap *pgmap) +{ + struct page *page = pfn_to_page(pfn); + const bool unmap_success = true; + unsigned long size; + LIST_HEAD(tokill); + int rc = -EBUSY; + loff_t start; + + lock_page(page); + if (hwpoison_filter(page)) { + rc = 0; + goto out; + } + + switch (pgmap->type) { + case MEMORY_DEVICE_PRIVATE: + case MEMORY_DEVICE_PUBLIC: + /* + * TODO: Handle HMM pages which may need coordination + * with device-side memory. + */ + goto out; + default: + if (!page->mapping) + goto out; + break; + } + + /* + * If the page is not mapped in userspace then report it as + * unhandled. + */ + size = dax_mapping_size(page); + if (!size) { + pr_err("Memory failure: %#lx: failed to unmap page\n", pfn); + goto out; + } + + SetPageHWPoison(page); + + /* + * Unlike System-RAM there is no possibility to swap in a + * different physical page at a given virtual address, so all + * userspace consumption of ZONE_DEVICE memory necessitates + * SIGBUS (i.e. MF_MUST_KILL) + */ + flags |= MF_ACTION_REQUIRED | MF_MUST_KILL; + collect_procs(page, &tokill, flags & MF_ACTION_REQUIRED); + + start = (page->index << PAGE_SHIFT) & ~(size - 1); + unmap_mapping_range(page->mapping, start, start + size, 0); + + kill_procs(&tokill, flags & MF_MUST_KILL, !unmap_success, ilog2(size), + pfn, flags); + rc = 0; +out: + unlock_page(page); + put_dev_pagemap(pgmap); + return rc; +} + /** * memory_failure - Handle memory failure of a page. * @pfn: Page Number of the corrupted page @@ -1134,6 +1246,7 @@ int memory_failure(unsigned long pfn, int flags) struct page *p; struct page *hpage; struct page *orig_head; + struct dev_pagemap *pgmap; int res; unsigned long page_flags; @@ -1146,6 +1259,10 @@ int memory_failure(unsigned long pfn, int flags) return -ENXIO; } + pgmap = get_dev_pagemap(pfn, NULL); + if (pgmap) + return memory_failure_dev_pagemap(pfn, flags, pgmap); + p = pfn_to_page(pfn); if (PageHuge(p)) return memory_failure_hugetlb(pfn, flags);