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From: Greentime Hu <green.hu@gmail.com>
To: Christoph Hellwig <hch@lst.de>, Nickhu <nickhu@andestech.com>,
	alankao@andestech.com
Cc: Arnd Bergmann <arnd@arndb.de>, Guo Ren <guoren@kernel.org>,
	Michal Simek <monstr@monstr.eu>,
	Vincent Chen <deanbo422@gmail.com>, Guan Xuetao <gxt@pku.edu.cn>,
	x86@kernel.org, linux-alpha@vger.kernel.org,
	linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org,
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	linux-arch <linux-arch@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 19/21] nds32: use generic ioremap
Date: Tue, 12 Nov 2019 16:51:29 +0800
Message-ID: <CAEbi=3c58Pb=Q3BqeTLhEK8OsdTpbD5tAe6VcGOC7JBWbTjetQ@mail.gmail.com> (raw)
In-Reply-To: <20191029064834.23438-20-hch@lst.de>

Hi,

Christoph Hellwig <hch@lst.de> 於 2019年10月29日 週二 下午2:49寫道:
>
> 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@lst.de>
> ---
>  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@gmail.com>
Looks good to me.

  reply index

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-29  6:48 generic ioremap (and lots of cleanups) v3 Christoph Hellwig
2019-10-29  6:48 ` [PATCH 01/21] arm: remove ioremap_cached Christoph Hellwig
2019-11-11 10:33   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 02/21] unicore32: " Christoph Hellwig
2019-10-29  6:48 ` [PATCH 03/21] ia64: rename ioremap_nocache to ioremap_uc Christoph Hellwig
2019-11-11 10:36   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 04/21] hexagon: clean up ioremap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 05/21] alpha: remove the unused __ioremap wrapper Christoph Hellwig
2019-10-29  6:48 ` [PATCH 06/21] nios2: remove __ioremap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 07/21] parisc: " Christoph Hellwig
2019-11-05 14:29   ` Helge Deller
2019-10-29  6:48 ` [PATCH 08/21] x86: Clean up ioremap() Christoph Hellwig
2019-10-30 10:39   ` Thomas Gleixner
2019-10-29  6:48 ` [PATCH 09/21] xtensa: clean up ioremap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 10/21] asm-generic: ioremap_uc should behave the same with and without MMU Christoph Hellwig
2019-11-06 17:56   ` Palmer Dabbelt
2019-11-11 10:09   ` Arnd Bergmann
2019-11-11 10:15     ` Christoph Hellwig
2019-11-11 10:27       ` Arnd Bergmann
2019-11-11 10:29         ` Christoph Hellwig
2019-11-11 19:33           ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 11/21] asm-generic: don't provide ioremap for CONFIG_MMU Christoph Hellwig
2019-11-06 18:11   ` Palmer Dabbelt
2019-11-06 18:16     ` Geert Uytterhoeven
2019-11-06 18:28       ` Christoph Hellwig
2019-11-11 10:31       ` Arnd Bergmann
2019-11-11 10:29   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 12/21] arch: rely on asm-generic/io.h for default ioremap_* definitions Christoph Hellwig
2019-11-07 15:29   ` Palmer Dabbelt
2019-11-11 10:10   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 13/21] m68k: rename __iounmap and mark it static Christoph Hellwig
2019-10-30  8:51   ` Geert Uytterhoeven
2019-10-29  6:48 ` [PATCH 14/21] hexagon: remove __iounmap Christoph Hellwig
2019-10-29  6:48 ` [PATCH 15/21] nios2: " Christoph Hellwig
2019-10-29  6:48 ` [PATCH 16/21] sh: " Christoph Hellwig
2019-10-29  6:48 ` [PATCH 17/21] lib: provide a simple generic ioremap implementation Christoph Hellwig
2019-11-07 15:29   ` Palmer Dabbelt
2019-11-11 10:10   ` Arnd Bergmann
2019-10-29  6:48 ` [PATCH 18/21] riscv: use the generic ioremap code Christoph Hellwig
2019-10-29  6:48 ` [PATCH 19/21] nds32: use generic ioremap Christoph Hellwig
2019-11-12  8:51   ` Greentime Hu [this message]
2019-10-29  6:48 ` [PATCH 20/21] csky: remove ioremap_cache Christoph Hellwig
2019-10-29  6:48 ` [PATCH 21/21] csky: use generic ioremap Christoph Hellwig
2019-11-05  1:31 ` generic ioremap (and lots of cleanups) v3 Christoph Hellwig
2019-11-07 20:47 ` generic-iomap tree for linux-next Christoph Hellwig
2019-11-08  2:20   ` Stephen Rothwell
2019-11-08  4:52     ` Stephen Rothwell
2019-11-08  5:14       ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2019-10-17 17:45 generic ioremap (and lots of cleanups) v2 Christoph Hellwig
2019-10-17 17:45 ` [PATCH 19/21] nds32: use generic ioremap Christoph Hellwig

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