diff options
| author |   Guo Ren <ren_guo@c-sky.com> | 2019-01-30 20:13:11 +0800 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2019-02-13 09:48:14 +0800 |
| commit | 76d21d186a65523b08ea5f70302e2c29ee8f6a8d (patch) | |
| tree | 0b8d869eb706911f0a7c38cac4d26e25f218b622 /arch/csky/mm/ioremap.c | |
| parent | csky: coding convention: Use task_stack_page (diff) | |
| download | linux-dev-76d21d186a65523b08ea5f70302e2c29ee8f6a8d.tar.xz linux-dev-76d21d186a65523b08ea5f70302e2c29ee8f6a8d.zip | |
csky: Fixup io-range page attribute for mmap("/dev/mem")
Some user space drivers need accessing IO address and IO remap need
SO(strong order) page-attribute to make IO operation correct. So we
need add SO-page-attr for all non-memory address.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reported-by: Fan Xiaodong <xiaodong.fan@boyahualu.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/csky/mm/ioremap.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c index cb7c03e5cd21..8473b6bdf512 100644 --- a/arch/csky/mm/ioremap.c +++ b/arch/csky/mm/ioremap.c @@ -46,3 +46,17 @@ void iounmap(void __iomem *addr) vunmap((void *)((unsigned long)addr & PAGE_MASK)); } EXPORT_SYMBOL(iounmap); + +pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, + unsigned long size, pgprot_t vma_prot) +{ + if (!pfn_valid(pfn)) { + vma_prot.pgprot |= _PAGE_SO; + return pgprot_noncached(vma_prot); + } else if (file->f_flags & O_SYNC) { + return pgprot_noncached(vma_prot); + } + + return vma_prot; +} +EXPORT_SYMBOL(phys_mem_access_prot); |