linux-kernel - Re: [PATCH v1] x86/io: Include asm-generic/io.h to architectural code

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Date:   Tue, 27 Jun 2017 23:53:19 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Baolin Wang <baolin.wang@...eadtrum.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH v1] x86/io: Include asm-generic/io.h to architectural code

On Tue, Jun 27, 2017 at 11:06 PM, Wolfram Sang <wsa@...-dreams.de> wrote:
> On Tue, Jun 27, 2017 at 07:06:41PM +0300, Andy Shevchenko wrote:
>> asm-generic/io.h defines few helpers which would be useful in the drivers,
>> such as writesb() and readsb().
>>
>> Include it to the asm/io.h in architectural folder.
>>
>> Note, to apply above we need to define macros for functions which do not have
>> them yet defined, such as readb() or writeb(). This is done here as well.
>>
>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>
> Yes, we had to drop COMPILE_TEST from drivers because of readsb/writesb
> not being available. Would be nice to have that fixed.
>
> Acked-by: Wolfram Sang <wsa@...-dreams.de>

Thanks!
I need to respin to make it more consistent (some macros should have
() component, some otherwise).

So, I would gather the comments and will send v2.

>
> No thorough review, though. Adding Shawn to CC who also hit this issue
> recently.
>
>> ---
>>  arch/x86/include/asm/io.h | 36 ++++++++++++++++++++++++++++++++++++
>>  1 file changed, 36 insertions(+)
>>
>> diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
>> index 7afb0e2f07f4..abb3090a5822 100644
>> --- a/arch/x86/include/asm/io.h
>> +++ b/arch/x86/include/asm/io.h
>> @@ -69,6 +69,9 @@ build_mmio_write(__writeb, "b", unsigned char, "q", )
>>  build_mmio_write(__writew, "w", unsigned short, "r", )
>>  build_mmio_write(__writel, "l", unsigned int, "r", )
>>
>> +#define readb readb
>> +#define readw readw
>> +#define readl readl
>>  #define readb_relaxed(a) __readb(a)
>>  #define readw_relaxed(a) __readw(a)
>>  #define readl_relaxed(a) __readl(a)
>> @@ -76,6 +79,9 @@ build_mmio_write(__writel, "l", unsigned int, "r", )
>>  #define __raw_readw __readw
>>  #define __raw_readl __readl
>>
>> +#define writeb writeb
>> +#define writew writew
>> +#define writel writel
>>  #define writeb_relaxed(v, a) __writeb(v, a)
>>  #define writew_relaxed(v, a) __writew(v, a)
>>  #define writel_relaxed(v, a) __writel(v, a)
>> @@ -119,6 +125,7 @@ static inline phys_addr_t virt_to_phys(volatile void *address)
>>  {
>>       return __pa(address);
>>  }
>> +#define virt_to_phys virt_to_phys
>>
>>  /**
>>   *   phys_to_virt    -       map physical address to virtual
>> @@ -137,6 +144,7 @@ static inline void *phys_to_virt(phys_addr_t address)
>>  {
>>       return __va(address);
>>  }
>> +#define phys_to_virt phys_to_virt
>>
>>  /*
>>   * Change "struct page" to physical address.
>> @@ -220,6 +228,7 @@ memset_io(volatile void __iomem *addr, unsigned char val, size_t count)
>>  {
>>       memset((void __force *)addr, val, count);
>>  }
>> +#define memset_io(dst,c,count) memset_io(dst,c,count)
>>
>>  /**
>>   * memcpy_fromio     Copy a block of data from I/O memory
>> @@ -234,6 +243,7 @@ memcpy_fromio(void *dst, const volatile void __iomem *src, size_t count)
>>  {
>>       memcpy(dst, (const void __force *)src, count);
>>  }
>> +#define memcpy_fromio(to,from,count) memcpy_fromio(to,from,count)
>>
>>  /**
>>   * memcpy_toio               Copy a block of data into I/O memory
>> @@ -248,6 +258,7 @@ memcpy_toio(volatile void __iomem *dst, const void *src, size_t count)
>>  {
>>       memcpy((void __force *)dst, src, count);
>>  }
>> +#define memcpy_toio(to,from,count) memcpy_toio(to,from,count)
>>
>>  /*
>>   * ISA space is 'always mapped' on a typical x86 system, no need to
>> @@ -341,9 +352,32 @@ BUILDIO(b, b, char)
>>  BUILDIO(w, w, short)
>>  BUILDIO(l, , int)
>>
>> +#define inb inb
>> +#define inw inw
>> +#define inl inl
>> +#define inb_p inb_p
>> +#define inw_p inw_p
>> +#define inl_p inl_p
>> +#define insb insb
>> +#define insw insw
>> +#define insl insl
>> +
>> +#define outb outb
>> +#define outw outw
>> +#define outl outl
>> +#define outb_p outb_p
>> +#define outw_p outw_p
>> +#define outl_p outl_p
>> +#define outsb outsb
>> +#define outsw outsw
>> +#define outsl outsl
>> +
>>  extern void *xlate_dev_mem_ptr(phys_addr_t phys);
>>  extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
>>
>> +#define xlate_dev_mem_ptr xlate_dev_mem_ptr
>> +#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
>> +
>>  extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
>>                               enum page_cache_mode pcm);
>>  extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
>> @@ -365,6 +399,8 @@ extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
>>
>>  #define IO_SPACE_LIMIT 0xffff
>>
>> +#include <asm-generic/io.h>
>> +
>>  #ifdef CONFIG_MTRR
>>  extern int __must_check arch_phys_wc_index(int handle);
>>  #define arch_phys_wc_index arch_phys_wc_index
>> --
>> 2.11.0
>>



-- 
With Best Regards,
Andy Shevchenko