Subject: Re: linux-next: Tree for Jul 2

From: Zhangshaokun <[email-masked]>
Date: Tue, 2 Jul 2019 20:22:41 +0800

Hi Will,

On 2019/7/2 20:03, Will Deacon wrote:
> [+Joerg]
> 
> On Tue, Jul 02, 2019 at 06:40:45PM +0800, Zhangshaokun wrote:
>> +Cc: Will Deacon
>>
>> There is a compiler failure on arm64 platform, as follow:
>> In file included from ./include/linux/list.h:9:0,
>>                  from ./include/linux/kobject.h:19,
>>                  from ./include/linux/of.h:17,
>>                  from ./include/linux/irqdomain.h:35,
>>                  from ./include/linux/acpi.h:13,
>>                  from drivers/iommu/arm-smmu-v3.c:12:
>> drivers/iommu/arm-smmu-v3.c: In function ‘arm_smmu_device_hw_probe’:
>> drivers/iommu/arm-smmu-v3.c:194:40: error: ‘CONFIG_CMA_ALIGNMENT’ undeclared (first use in this function)
>>  #define Q_MAX_SZ_SHIFT   (PAGE_SHIFT + CONFIG_CMA_ALIGNMENT)
>>                                         ^
>> It's the commit <d25f6ead162e> ("iommu/arm-smmu-v3: Increase maximum size of queues")
> 
> Thanks for the report. I've provided a fix below.
> 

It works, thanks for the patch,
Tested-by: Shaokun Zhang <[email-masked]>

Thanks,
Shaokun

> Joerg -- please can you take this on top of the SMMUv3 patches queued
> for 5.3?
> 
> Cheers,
> 
> Will
> 
> --->8
> 
>>>From e8f9d8229e3aaa4817bfb72752e804eec97a3d8d Mon Sep 17 00:00:00 2001
> From: Will Deacon <[email-masked]>
> Date: Tue, 2 Jul 2019 12:53:18 +0100
> Subject: [PATCH] iommu/arm-smmu-v3: Fix compilation when CONFIG_CMA=n
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> When compiling a kernel without support for CMA, CONFIG_CMA_ALIGNMENT
> is not defined which results in the following build failure:
> 
> In file included from ./include/linux/list.h:9:0
>                  from ./include/linux/kobject.h:19,
>                  from ./include/linux/of.h:17
>                  from ./include/linux/irqdomain.h:35,
>                  from ./include/linux/acpi.h:13,
>                  from drivers/iommu/arm-smmu-v3.c:12:
> drivers/iommu/arm-smmu-v3.c: In function ‘arm_smmu_device_hw_probe’:
> drivers/iommu/arm-smmu-v3.c:194:40: error: ‘CONFIG_CMA_ALIGNMENT’ undeclared (first use in this function)
>  #define Q_MAX_SZ_SHIFT   (PAGE_SHIFT + CONFIG_CMA_ALIGNMENT)
> 
> Fix the breakage by capping the maximum queue size based on MAX_ORDER
> when CMA is not enabled.
> 
> Reported-by: Zhangshaokun <[email-masked]>
> Signed-off-by: Will Deacon <[email-masked]>
> ---
>  drivers/iommu/arm-smmu-v3.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 57fb4e080d6b..8e73a7615bf5 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -191,7 +191,13 @@
>  #define Q_BASE_RWA			(1UL << 62)
>  #define Q_BASE_ADDR_MASK		GENMASK_ULL(51, 5)
>  #define Q_BASE_LOG2SIZE			GENMASK(4, 0)
> +
> +/* Ensure DMA allocations are naturally aligned */
> +#ifdef CONFIG_CMA_ALIGNMENT
>  #define Q_MAX_SZ_SHIFT			(PAGE_SHIFT + CONFIG_CMA_ALIGNMENT)
> +#else
> +#define Q_MAX_SZ_SHIFT			(PAGE_SHIFT + MAX_ORDER - 1)
> +#endif
>  
>  /*
>   * Stream table.
>