mirror of
https://github.com/opnsense/src.git
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67dcd64ab8
When the owner of the wire reference releases the last reference, it might be that the page was already attempted to be freed (but free cannot be performed at that time due to wire). Check that the page was removed from the object as the indicator of the free attempt and finish the free operation if so. Reported and tested by: Slava Shwartsman Reviewed by: hselasky Sponsored by: Mellanox Technologies MFC after: 1 week
270 lines
6.7 KiB
C
270 lines
6.7 KiB
C
/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
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* Copyright (c) 2015 François Tigeot
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* Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _LINUX_MM_H_
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#define _LINUX_MM_H_
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#include <linux/spinlock.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/mm_types.h>
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#include <linux/pfn.h>
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#include <linux/list.h>
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#include <asm/pgtable.h>
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#define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE)
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/*
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* Make sure our LinuxKPI defined virtual memory flags don't conflict
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* with the ones defined by FreeBSD:
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*/
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CTASSERT((VM_PROT_ALL & -(1 << 8)) == 0);
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#define VM_READ VM_PROT_READ
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#define VM_WRITE VM_PROT_WRITE
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#define VM_EXEC VM_PROT_EXECUTE
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#define VM_PFNINTERNAL (1 << 8) /* FreeBSD private flag to vm_insert_pfn() */
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#define VM_MIXEDMAP (1 << 9)
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#define VM_NORESERVE (1 << 10)
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#define VM_PFNMAP (1 << 11)
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#define VM_IO (1 << 12)
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#define VM_MAYWRITE (1 << 13)
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#define VM_DONTCOPY (1 << 14)
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#define VM_DONTEXPAND (1 << 15)
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#define VM_DONTDUMP (1 << 16)
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#define VMA_MAX_PREFAULT_RECORD 1
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#define FOLL_WRITE (1 << 0)
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#define FOLL_FORCE (1 << 1)
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#define VM_FAULT_OOM (1 << 0)
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#define VM_FAULT_SIGBUS (1 << 1)
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#define VM_FAULT_MAJOR (1 << 2)
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#define VM_FAULT_WRITE (1 << 3)
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#define VM_FAULT_HWPOISON (1 << 4)
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#define VM_FAULT_HWPOISON_LARGE (1 << 5)
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#define VM_FAULT_SIGSEGV (1 << 6)
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#define VM_FAULT_NOPAGE (1 << 7)
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#define VM_FAULT_LOCKED (1 << 8)
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#define VM_FAULT_RETRY (1 << 9)
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#define VM_FAULT_FALLBACK (1 << 10)
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#define FAULT_FLAG_WRITE (1 << 0)
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#define FAULT_FLAG_MKWRITE (1 << 1)
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#define FAULT_FLAG_ALLOW_RETRY (1 << 2)
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#define FAULT_FLAG_RETRY_NOWAIT (1 << 3)
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#define FAULT_FLAG_KILLABLE (1 << 4)
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#define FAULT_FLAG_TRIED (1 << 5)
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#define FAULT_FLAG_USER (1 << 6)
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#define FAULT_FLAG_REMOTE (1 << 7)
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#define FAULT_FLAG_INSTRUCTION (1 << 8)
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typedef int (*pte_fn_t)(linux_pte_t *, pgtable_t, unsigned long addr, void *data);
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struct vm_area_struct {
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vm_offset_t vm_start;
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vm_offset_t vm_end;
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vm_offset_t vm_pgoff;
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pgprot_t vm_page_prot;
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unsigned long vm_flags;
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struct mm_struct *vm_mm;
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void *vm_private_data;
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const struct vm_operations_struct *vm_ops;
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struct linux_file *vm_file;
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/* internal operation */
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vm_paddr_t vm_pfn; /* PFN for memory map */
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vm_size_t vm_len; /* length for memory map */
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vm_pindex_t vm_pfn_first;
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int vm_pfn_count;
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int *vm_pfn_pcount;
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vm_object_t vm_obj;
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vm_map_t vm_cached_map;
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TAILQ_ENTRY(vm_area_struct) vm_entry;
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};
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struct vm_fault {
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unsigned int flags;
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pgoff_t pgoff;
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void *virtual_address; /* user-space address */
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struct page *page;
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};
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struct vm_operations_struct {
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void (*open) (struct vm_area_struct *);
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void (*close) (struct vm_area_struct *);
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int (*fault) (struct vm_area_struct *, struct vm_fault *);
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};
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/*
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* Compute log2 of the power of two rounded up count of pages
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* needed for size bytes.
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*/
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static inline int
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get_order(unsigned long size)
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{
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int order;
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size = (size - 1) >> PAGE_SHIFT;
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order = 0;
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while (size) {
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order++;
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size >>= 1;
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}
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return (order);
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}
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static inline void *
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lowmem_page_address(struct page *page)
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{
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return (page_address(page));
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}
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/*
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* This only works via memory map operations.
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*/
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static inline int
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io_remap_pfn_range(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn, unsigned long size,
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vm_memattr_t prot)
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{
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vma->vm_page_prot = prot;
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vma->vm_pfn = pfn;
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vma->vm_len = size;
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return (0);
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}
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static inline int
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apply_to_page_range(struct mm_struct *mm, unsigned long address,
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unsigned long size, pte_fn_t fn, void *data)
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{
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return (-ENOTSUP);
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}
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static inline int
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zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
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unsigned long size)
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{
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return (-ENOTSUP);
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}
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static inline int
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remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
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unsigned long pfn, unsigned long size, pgprot_t prot)
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{
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return (-ENOTSUP);
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}
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static inline unsigned long
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vma_pages(struct vm_area_struct *vma)
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{
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return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
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}
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#define offset_in_page(off) ((off) & (PAGE_SIZE - 1))
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static inline void
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set_page_dirty(struct vm_page *page)
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{
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vm_page_dirty(page);
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}
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static inline void
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set_page_dirty_lock(struct vm_page *page)
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{
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vm_page_lock(page);
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vm_page_dirty(page);
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vm_page_unlock(page);
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}
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static inline void
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mark_page_accessed(struct vm_page *page)
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{
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vm_page_reference(page);
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}
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static inline void
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get_page(struct vm_page *page)
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{
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vm_page_lock(page);
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vm_page_wire(page);
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vm_page_unlock(page);
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}
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extern long
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get_user_pages(unsigned long start, unsigned long nr_pages,
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int gup_flags, struct page **,
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struct vm_area_struct **);
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extern int
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__get_user_pages_fast(unsigned long start, int nr_pages, int write,
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struct page **);
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extern long
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get_user_pages_remote(struct task_struct *, struct mm_struct *,
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unsigned long start, unsigned long nr_pages,
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int gup_flags, struct page **,
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struct vm_area_struct **);
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static inline void
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put_page(struct vm_page *page)
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{
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vm_page_lock(page);
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if (vm_page_unwire(page, PQ_ACTIVE) && page->object == NULL)
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vm_page_free(page);
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vm_page_unlock(page);
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}
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#define copy_highpage(to, from) pmap_copy_page(from, to)
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static inline pgprot_t
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vm_get_page_prot(unsigned long vm_flags)
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{
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return (vm_flags & VM_PROT_ALL);
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}
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static inline vm_page_t
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vmalloc_to_page(const void *addr)
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{
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vm_paddr_t paddr;
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paddr = pmap_kextract((vm_offset_t)addr);
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return (PHYS_TO_VM_PAGE(paddr));
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}
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extern int is_vmalloc_addr(const void *addr);
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#endif /* _LINUX_MM_H_ */
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