linux-kernel - Re: [PATCH 4.19 049/114] iommu/tegra-smmu: Fix invalid ASID bits on Tegra30/114

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Message-ID: <20190527154647.GA4050@xo-6d-61-c0.localdomain>
Date:   Mon, 27 May 2019 17:46:47 +0200
From:   Pavel Machek <pavel@....cz>
To:     pavel@....cz
Cc:     linux-kernel@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 4.19 049/114] iommu/tegra-smmu: Fix invalid ASID bits on
 Tegra30/114

On Thu 2019-05-23 21:05:48, Greg Kroah-Hartman wrote:
> From: Dmitry Osipenko <digetx@...il.com>
> 
> commit 43a0541e312f7136e081e6bf58f6c8a2e9672688 upstream.
> 
> Both Tegra30 and Tegra114 have 4 ASID's and the corresponding bitfield of
> the TLB_FLUSH register differs from later Tegra generations that have 128
> ASID's.
> 
> In a result the PTE's are now flushed correctly from TLB and this fixes
> problems with graphics (randomly failing tests) on Tegra30.


Three copies of same code... maybe its time to introduce helper function?

> --- a/drivers/iommu/tegra-smmu.c
> +++ b/drivers/iommu/tegra-smmu.c
> @@ -102,7 +102,6 @@ static inline u32 smmu_readl(struct tegr
>  #define  SMMU_TLB_FLUSH_VA_MATCH_ALL     (0 << 0)
>  #define  SMMU_TLB_FLUSH_VA_MATCH_SECTION (2 << 0)
>  #define  SMMU_TLB_FLUSH_VA_MATCH_GROUP   (3 << 0)
> -#define  SMMU_TLB_FLUSH_ASID(x)          (((x) & 0x7f) << 24)
>  #define  SMMU_TLB_FLUSH_VA_SECTION(addr) ((((addr) & 0xffc00000) >> 12) | \
>  					  SMMU_TLB_FLUSH_VA_MATCH_SECTION)
>  #define  SMMU_TLB_FLUSH_VA_GROUP(addr)   ((((addr) & 0xffffc000) >> 12) | \
> @@ -205,8 +204,12 @@ static inline void smmu_flush_tlb_asid(s
>  {
>  	u32 value;
>  
> -	value = SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_ASID(asid) |
> -		SMMU_TLB_FLUSH_VA_MATCH_ALL;
> +	if (smmu->soc->num_asids == 4)
> +		value = (asid & 0x3) << 29;
> +	else
> +		value = (asid & 0x7f) << 24;
> +
> +	value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_MATCH_ALL;
>  	smmu_writel(smmu, value, SMMU_TLB_FLUSH);
>  }
>  
> @@ -216,8 +219,12 @@ static inline void smmu_flush_tlb_sectio
>  {
>  	u32 value;
>  
> -	value = SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_ASID(asid) |
> -		SMMU_TLB_FLUSH_VA_SECTION(iova);
> +	if (smmu->soc->num_asids == 4)
> +		value = (asid & 0x3) << 29;
> +	else
> +		value = (asid & 0x7f) << 24;
> +
> +	value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_SECTION(iova);
>  	smmu_writel(smmu, value, SMMU_TLB_FLUSH);
>  }
>  
> @@ -227,8 +234,12 @@ static inline void smmu_flush_tlb_group(
>  {
>  	u32 value;
>  
> -	value = SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_ASID(asid) |
> -		SMMU_TLB_FLUSH_VA_GROUP(iova);
> +	if (smmu->soc->num_asids == 4)
> +		value = (asid & 0x3) << 29;
> +	else
> +		value = (asid & 0x7f) << 24;
> +
> +	value |= SMMU_TLB_FLUSH_ASID_MATCH | SMMU_TLB_FLUSH_VA_GROUP(iova);
>  	smmu_writel(smmu, value, SMMU_TLB_FLUSH);
>  }
>  
> 

-- 
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