[PATCH] iommu: SUN50I_IOMMU should depend on HAS_DMA

[PATCH] iommu: SUN50I_IOMMU should depend on HAS_DMA

[Geert Uytterhoeven]

If NO_DMA=y (e.g. Sun-3 all{mod,yes}-config):

    drivers/iommu/dma-iommu.o: In function `iommu_dma_mmap':
    dma-iommu.c:(.text+0x92e): undefined reference to `dma_pgprot'

IOMMU_DMA must not be selected, unless HAS_DMA=y.

Hence fix this by making SUN50I_IOMMU depend on HAS_DMA.

Fixes: 4100b8c229b32835 ("iommu: Add Allwinner H6 IOMMU driver")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 drivers/iommu/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 6dc49ed8377a5c12..b0f308cb7f7c2fc2 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -305,6 +305,7 @@ config ROCKCHIP_IOMMU
 
 config SUN50I_IOMMU
 	bool "Allwinner H6 IOMMU Support"
+	depends on HAS_DMA
 	depends on ARCH_SUNXI || COMPILE_TEST
 	select ARM_DMA_USE_IOMMU
 	select IOMMU_API
-- 
2.17.1

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Re: [PATCH] iommu: SUN50I_IOMMU should depend on HAS_DMA

[Maxime Ripard]

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On Mon, Jun 29, 2020 at 02:11:46PM +0200, Geert Uytterhoeven wrote:
> If NO_DMA=y (e.g. Sun-3 all{mod,yes}-config):
> 
>     drivers/iommu/dma-iommu.o: In function `iommu_dma_mmap':
>     dma-iommu.c:(.text+0x92e): undefined reference to `dma_pgprot'
> 
> IOMMU_DMA must not be selected, unless HAS_DMA=y.
> 
> Hence fix this by making SUN50I_IOMMU depend on HAS_DMA.
> 
> Fixes: 4100b8c229b32835 ("iommu: Add Allwinner H6 IOMMU driver")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Acked-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime

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Re: [PATCH] iommu: SUN50I_IOMMU should depend on HAS_DMA

[Robin Murphy]

On 2020-06-29 13:11, Geert Uytterhoeven wrote:
> If NO_DMA=y (e.g. Sun-3 all{mod,yes}-config):
> 
>      drivers/iommu/dma-iommu.o: In function `iommu_dma_mmap':
>      dma-iommu.c:(.text+0x92e): undefined reference to `dma_pgprot'
> 
> IOMMU_DMA must not be selected, unless HAS_DMA=y.

Wait, no, IOMMU_DMA should not be selected by drivers at all - it's for 
arch code to choose.

x86 just complicates matters with some of its arch code being in its 
IOMMU drivers...

Robin.

> Hence fix this by making SUN50I_IOMMU depend on HAS_DMA.
> 
> Fixes: 4100b8c229b32835 ("iommu: Add Allwinner H6 IOMMU driver")
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
>   drivers/iommu/Kconfig | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> index 6dc49ed8377a5c12..b0f308cb7f7c2fc2 100644
> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -305,6 +305,7 @@ config ROCKCHIP_IOMMU
>   
>   config SUN50I_IOMMU
>   	bool "Allwinner H6 IOMMU Support"
> +	depends on HAS_DMA
>   	depends on ARCH_SUNXI || COMPILE_TEST
>   	select ARM_DMA_USE_IOMMU
>   	select IOMMU_API
> 
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Re: [PATCH] iommu: SUN50I_IOMMU should depend on HAS_DMA

[Joerg Roedel]

On Mon, Jun 29, 2020 at 05:29:36PM +0100, Robin Murphy wrote:
> On 2020-06-29 13:11, Geert Uytterhoeven wrote:
> > If NO_DMA=y (e.g. Sun-3 all{mod,yes}-config):
> > 
> >      drivers/iommu/dma-iommu.o: In function `iommu_dma_mmap':
> >      dma-iommu.c:(.text+0x92e): undefined reference to `dma_pgprot'
> > 
> > IOMMU_DMA must not be selected, unless HAS_DMA=y.
> 
> Wait, no, IOMMU_DMA should not be selected by drivers at all - it's for arch
> code to choose.

Okay, but that is a different fix, right? I queued this patch for v5.8
for now.
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Re: [PATCH] iommu: SUN50I_IOMMU should depend on HAS_DMA

[Robin Murphy]

On 2020-06-30 11:09, Joerg Roedel wrote:
> On Mon, Jun 29, 2020 at 05:29:36PM +0100, Robin Murphy wrote:
>> On 2020-06-29 13:11, Geert Uytterhoeven wrote:
>>> If NO_DMA=y (e.g. Sun-3 all{mod,yes}-config):
>>>
>>>       drivers/iommu/dma-iommu.o: In function `iommu_dma_mmap':
>>>       dma-iommu.c:(.text+0x92e): undefined reference to `dma_pgprot'
>>>
>>> IOMMU_DMA must not be selected, unless HAS_DMA=y.
>>
>> Wait, no, IOMMU_DMA should not be selected by drivers at all - it's for arch
>> code to choose.
> 
> Okay, but that is a different fix, right? I queued this patch for v5.8
> for now.

If the driver didn't select IOMMU_DMA (completely unnecessarily, I might 
add), there wouldn't be any problem to fix in the first place ;)

Robin.
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