Re: [PATCH 19/21] nds32: use generic ioremap

[Greentime Hu]

Hi,

Christoph Hellwig <hch@xxxxxx> æ 2019å10æ29æ éä äå2:49åéï
>
> Use the generic ioremap_prot and iounmap helpers.
>
> Note that the io.h include in pgtable.h had to be removed to not create
> an include loop.  As far as I can tell there was no need for it to
> start with.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
>  arch/nds32/Kconfig               |  1 +
>  arch/nds32/include/asm/io.h      |  3 +-
>  arch/nds32/include/asm/pgtable.h |  4 ++-
>  arch/nds32/mm/Makefile           |  3 +-
>  arch/nds32/mm/ioremap.c          | 62 --------------------------------
>  5 files changed, 6 insertions(+), 67 deletions(-)
>  delete mode 100644 arch/nds32/mm/ioremap.c
>
> diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig
> index fbd68329737f..12c06a833b7c 100644
> --- a/arch/nds32/Kconfig
> +++ b/arch/nds32/Kconfig
> @@ -20,6 +20,7 @@ config NDS32
>         select GENERIC_CLOCKEVENTS
>         select GENERIC_IRQ_CHIP
>         select GENERIC_IRQ_SHOW
> +       select GENERIC_IOREMAP
>         select GENERIC_LIB_ASHLDI3
>         select GENERIC_LIB_ASHRDI3
>         select GENERIC_LIB_CMPDI2
> diff --git a/arch/nds32/include/asm/io.h b/arch/nds32/include/asm/io.h
> index fb0e8a24c7af..e57378d04006 100644
> --- a/arch/nds32/include/asm/io.h
> +++ b/arch/nds32/include/asm/io.h
> @@ -6,8 +6,6 @@
>
>  #include <linux/types.h>
>
> -void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
> -extern void iounmap(volatile void __iomem *addr);
>  #define __raw_writeb __raw_writeb
>  static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
>  {
> @@ -80,6 +78,7 @@ static inline u32 __raw_readl(const volatile void __iomem *addr)
>  #define writeb(v,c)    ({ __iowmb(); writeb_relaxed((v),(c)); })
>  #define writew(v,c)    ({ __iowmb(); writew_relaxed((v),(c)); })
>  #define writel(v,c)    ({ __iowmb(); writel_relaxed((v),(c)); })
> +
>  #include <asm-generic/io.h>
>
>  #endif /* __ASM_NDS32_IO_H */
> diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
> index 0588ec99725c..6fbf251cfc26 100644
> --- a/arch/nds32/include/asm/pgtable.h
> +++ b/arch/nds32/include/asm/pgtable.h
> @@ -12,7 +12,6 @@
>  #include <asm/nds32.h>
>  #ifndef __ASSEMBLY__
>  #include <asm/fixmap.h>
> -#include <asm/io.h>
>  #include <nds32_intrinsic.h>
>  #endif
>
> @@ -130,6 +129,9 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
>  #define _PAGE_CACHE            _PAGE_C_MEM_WB
>  #endif
>
> +#define _PAGE_IOREMAP \
> +       (_PAGE_V | _PAGE_M_KRW | _PAGE_D | _PAGE_G | _PAGE_C_DEV)
> +
>  /*
>   * + Level 1 descriptor (PMD)
>   */
> diff --git a/arch/nds32/mm/Makefile b/arch/nds32/mm/Makefile
> index bd360e4583b5..897ecaf5cf54 100644
> --- a/arch/nds32/mm/Makefile
> +++ b/arch/nds32/mm/Makefile
> @@ -1,6 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -obj-y                          := extable.o tlb.o \
> -                                  fault.o init.o ioremap.o mmap.o \
> +obj-y                          := extable.o tlb.o fault.o init.o mmap.o \
>                                     mm-nds32.o cacheflush.o proc.o
>
>  obj-$(CONFIG_ALIGNMENT_TRAP)   += alignment.o
> diff --git a/arch/nds32/mm/ioremap.c b/arch/nds32/mm/ioremap.c
> deleted file mode 100644
> index 690140bb23a2..000000000000
> --- a/arch/nds32/mm/ioremap.c
> +++ /dev/null
> @@ -1,62 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -// Copyright (C) 2005-2017 Andes Technology Corporation
> -
> -#include <linux/vmalloc.h>
> -#include <linux/io.h>
> -#include <linux/mm.h>
> -#include <asm/pgtable.h>
> -
> -void __iomem *ioremap(phys_addr_t phys_addr, size_t size);
> -
> -static void __iomem *__ioremap_caller(phys_addr_t phys_addr, size_t size,
> -                                     void *caller)
> -{
> -       struct vm_struct *area;
> -       unsigned long addr, offset, last_addr;
> -       pgprot_t prot;
> -
> -       /* Don't allow wraparound or zero size */
> -       last_addr = phys_addr + size - 1;
> -       if (!size || last_addr < phys_addr)
> -               return NULL;
> -
> -       /*
> -        * Mappings have to be page-aligned
> -        */
> -       offset = phys_addr & ~PAGE_MASK;
> -       phys_addr &= PAGE_MASK;
> -       size = PAGE_ALIGN(last_addr + 1) - phys_addr;
> -
> -       /*
> -        * Ok, go for it..
> -        */
> -       area = get_vm_area_caller(size, VM_IOREMAP, caller);
> -       if (!area)
> -               return NULL;
> -
> -       area->phys_addr = phys_addr;
> -       addr = (unsigned long)area->addr;
> -       prot = __pgprot(_PAGE_V | _PAGE_M_KRW | _PAGE_D |
> -                       _PAGE_G | _PAGE_C_DEV);
> -       if (ioremap_page_range(addr, addr + size, phys_addr, prot)) {
> -               vunmap((void *)addr);
> -               return NULL;
> -       }
> -       return (__force void __iomem *)(offset + (char *)addr);
> -
> -}
> -
> -void __iomem *ioremap(phys_addr_t phys_addr, size_t size)
> -{
> -       return __ioremap_caller(phys_addr, size,
> -                               __builtin_return_address(0));
> -}
> -
> -EXPORT_SYMBOL(ioremap);
> -
> -void iounmap(volatile void __iomem * addr)
> -{
> -       vunmap((void *)(PAGE_MASK & (unsigned long)addr));
> -}
> -
> -EXPORT_SYMBOL(iounmap);

Acked-by: Greentime Hu <green.hu@xxxxxxxxx>
Looks good to me.