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Linux/arch/arc/mm/mmap.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * ARC700 mmap
  4  *
  5  * (started from arm version - for VIPT alias handling)
  6  *
  7  * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
  8  */
  9 
 10 #include <linux/fs.h>
 11 #include <linux/mm.h>
 12 #include <linux/mman.h>
 13 #include <linux/sched/mm.h>
 14 
 15 #include <asm/cacheflush.h>
 16 
 17 #define COLOUR_ALIGN(addr, pgoff)                       \
 18         ((((addr) + SHMLBA - 1) & ~(SHMLBA - 1)) +      \
 19          (((pgoff) << PAGE_SHIFT) & (SHMLBA - 1)))
 20 
 21 /*
 22  * Ensure that shared mappings are correctly aligned to
 23  * avoid aliasing issues with VIPT caches.
 24  * We need to ensure that
 25  * a specific page of an object is always mapped at a multiple of
 26  * SHMLBA bytes.
 27  */
 28 unsigned long
 29 arch_get_unmapped_area(struct file *filp, unsigned long addr,
 30                 unsigned long len, unsigned long pgoff, unsigned long flags)
 31 {
 32         struct mm_struct *mm = current->mm;
 33         struct vm_area_struct *vma;
 34         int do_align = 0;
 35         int aliasing = cache_is_vipt_aliasing();
 36         struct vm_unmapped_area_info info;
 37 
 38         /*
 39          * We only need to do colour alignment if D cache aliases.
 40          */
 41         if (aliasing)
 42                 do_align = filp || (flags & MAP_SHARED);
 43 
 44         /*
 45          * We enforce the MAP_FIXED case.
 46          */
 47         if (flags & MAP_FIXED) {
 48                 if (aliasing && flags & MAP_SHARED &&
 49                     (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
 50                         return -EINVAL;
 51                 return addr;
 52         }
 53 
 54         if (len > TASK_SIZE)
 55                 return -ENOMEM;
 56 
 57         if (addr) {
 58                 if (do_align)
 59                         addr = COLOUR_ALIGN(addr, pgoff);
 60                 else
 61                         addr = PAGE_ALIGN(addr);
 62 
 63                 vma = find_vma(mm, addr);
 64                 if (TASK_SIZE - len >= addr &&
 65                     (!vma || addr + len <= vm_start_gap(vma)))
 66                         return addr;
 67         }
 68 
 69         info.flags = 0;
 70         info.length = len;
 71         info.low_limit = mm->mmap_base;
 72         info.high_limit = TASK_SIZE;
 73         info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
 74         info.align_offset = pgoff << PAGE_SHIFT;
 75         return vm_unmapped_area(&info);
 76 }
 77 

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