linux-kernel - Re: [PATCH 5.4 40/50] dma-direct: exclude dma_direct_map_resource from the min_low

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Date:   Fri, 8 May 2020 18:50:02 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@....de>, m.szyprowski@...sung.com
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux- stable <stable@...r.kernel.org>,
        lkft-triage@...ts.linaro.org
Subject: Re: [PATCH 5.4 40/50] dma-direct: exclude dma_direct_map_resource
 from the min_low_pfn check

On Fri, 8 May 2020 at 18:23, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> From: Christoph Hellwig <hch@....de>
>
> commit 68a33b1794665ba8a1d1ef1d3bfcc7c587d380a6 upstream.
>
> The valid memory address check in dma_capable only makes sense when mapping
> normal memory, not when using dma_map_resource to map a device resource.
> Add a new boolean argument to dma_capable to exclude that check for the
> dma_map_resource case.
>
> Fixes: b12d66278dd6 ("dma-direct: check for overflows on 32 bit DMA addresses")
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Christoph Hellwig <hch@....de>
> Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
<trim>
>
> --- a/kernel/dma/direct.c
> +++ b/kernel/dma/direct.c
> @@ -327,7 +327,7 @@ static inline bool dma_direct_possible(s
>                 size_t size)
>  {
>         return swiotlb_force != SWIOTLB_FORCE &&
> -               dma_capable(dev, dma_addr, size);
> +               dma_capable(dev, dma_addr, size, true);

While building kernel Image for arm architecture the following error noticed
on stale-rc 5.4 kernel branch.

 # make -sk KBUILD_BUILD_USER=TuxBuild -C/linux -j16 ARCH=arm
CROSS_COMPILE=arm-linux-gnueabihf- HOSTCC=gcc CC="sccache
arm-linux-gnueabihf-gcc" O=build zImage
 #
 ../kernel/dma/direct.c: In function ‘dma_direct_possible’:
 ../kernel/dma/direct.c:330:3: error: too many arguments to function
‘dma_capable’
   330 |   dma_capable(dev, dma_addr, size, true);
       |   ^~~~~~~~~~~
 In file included from ../include/linux/dma-direct.h:12,
                  from ../kernel/dma/direct.c:10:
 ../arch/arm/include/asm/dma-direct.h:17:20: note: declared here
    17 | static inline bool dma_capable(struct device *dev, dma_addr_t
addr, size_t size)
       |                    ^~~~~~~~~~~
 In file included from ../include/linux/init.h:5,
                  from ../include/linux/memblock.h:12,
                  from ../kernel/dma/direct.c:7:
 ../kernel/dma/direct.c: In function ‘dma_direct_map_resource’:
 ../kernel/dma/direct.c:379:16: error: too many arguments to function
‘dma_capable’
   379 |  if (unlikely(!dma_capable(dev, dma_addr, size, false))) {
       |                ^~~~~~~~~~~
 ../include/linux/compiler.h:78:42: note: in definition of macro ‘unlikely’
    78 | # define unlikely(x) __builtin_expect(!!(x), 0)
       |                                          ^
 In file included from ../include/linux/dma-direct.h:12,
                  from ../kernel/dma/direct.c:10:
 ../arch/arm/include/asm/dma-direct.h:17:20: note: declared here
    17 | static inline bool dma_capable(struct device *dev, dma_addr_t
addr, size_t size)
       |                    ^~~~~~~~~~~
 make[3]: *** [../scripts/Makefile.build:266: kernel/dma/direct.o] Error 1
 In file included from ../include/linux/string.h:6,
                  from ../include/linux/dma-mapping.h:6,
                  from ../include/linux/dma-direct.h:5,
                  from ../kernel/dma/swiotlb.c:24:
 ../kernel/dma/swiotlb.c: In function ‘swiotlb_map’:
 ../kernel/dma/swiotlb.c:681:16: error: too many arguments to function
‘dma_capable’
   681 |  if (unlikely(!dma_capable(dev, *dma_addr, size, true))) {
       |                ^~~~~~~~~~~
 ../include/linux/compiler.h:78:42: note: in definition of macro ‘unlikely’
    78 | # define unlikely(x) __builtin_expect(!!(x), 0)
       |                                          ^
 In file included from ../include/linux/dma-direct.h:12,
                  from ../kernel/dma/swiotlb.c:24:
 ../arch/arm/include/asm/dma-direct.h:17:20: note: declared here
    17 | static inline bool dma_capable(struct device *dev, dma_addr_t
addr, size_t size)
       |                    ^~~~~~~~~~~