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Subject: Re: [PATCH 1/5] iommu/io-pgtable-arm: Add BROKEN_NS quirk to disable
 shareability on ARM LPAE
To:     Steven Price <steven.price@arm.com>, robh@kernel.org,
        tomeu.vizoso@collabora.com, alyssa.rosenzweig@collabora.com
Cc:     dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-amlogic@lists.infradead.org
References: <20200908151853.4837-1-narmstrong@baylibre.com>
 <20200908151853.4837-2-narmstrong@baylibre.com>
 <f8ec460a-d61f-852d-2620-a49306bb1de4@arm.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Message-ID: <b6886f02-d2a0-22cc-8419-e964656e4967@baylibre.com>
Date:   Wed, 9 Sep 2020 14:27:57 +0200
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Sender: linux-kernel-owner@vger.kernel.org
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On 09/09/2020 14:23, Steven Price wrote:
> Subject: s/BROKEN_NS/BROKEN_SH/

Thanks,
Neil

> 
> Steve
> 
> On 08/09/2020 16:18, Neil Armstrong wrote:
>> The coherency integration of the IOMMU in the Mali-G52 found in the Amlogic G12B SoCs
>> is broken and leads to constant and random faults from the IOMMU.
>>
>> Disabling shareability completely fixes the issue.
>>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>> ---
>>   drivers/iommu/io-pgtable-arm.c | 7 ++++---
>>   include/linux/io-pgtable.h     | 4 ++++
>>   2 files changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
>> index dc7bcf858b6d..d2d48dc86556 100644
>> --- a/drivers/iommu/io-pgtable-arm.c
>> +++ b/drivers/iommu/io-pgtable-arm.c
>> @@ -440,7 +440,9 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
>>                   << ARM_LPAE_PTE_ATTRINDX_SHIFT);
>>       }
>>   -    if (prot & IOMMU_CACHE)
>> +    if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_BROKEN_SH)
>> +        pte |= ARM_LPAE_PTE_SH_NS;
>> +    else if (prot & IOMMU_CACHE)
>>           pte |= ARM_LPAE_PTE_SH_IS;
>>       else
>>           pte |= ARM_LPAE_PTE_SH_OS;
>> @@ -1005,8 +1007,7 @@ arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
>>   {
>>       struct arm_lpae_io_pgtable *data;
>>   -    /* No quirks for Mali (hopefully) */
>> -    if (cfg->quirks)
>> +    if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_BROKEN_SH))
>>           return NULL;
>>         if (cfg->ias > 48 || cfg->oas > 40)
>> diff --git a/include/linux/io-pgtable.h b/include/linux/io-pgtable.h
>> index 23285ba645db..efb9c8f20909 100644
>> --- a/include/linux/io-pgtable.h
>> +++ b/include/linux/io-pgtable.h
>> @@ -86,6 +86,9 @@ struct io_pgtable_cfg {
>>        *
>>        * IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
>>        *    for use in the upper half of a split address space.
>> +     *
>> +     * IO_PGTABLE_QUIRK_ARM_BROKEN_SH: (ARM LPAE format) Disables shareability
>> +     *    when coherency integration is broken.
>>        */
>>       #define IO_PGTABLE_QUIRK_ARM_NS        BIT(0)
>>       #define IO_PGTABLE_QUIRK_NO_PERMS    BIT(1)
>> @@ -93,6 +96,7 @@ struct io_pgtable_cfg {
>>       #define IO_PGTABLE_QUIRK_ARM_MTK_EXT    BIT(3)
>>       #define IO_PGTABLE_QUIRK_NON_STRICT    BIT(4)
>>       #define IO_PGTABLE_QUIRK_ARM_TTBR1    BIT(5)
>> +    #define IO_PGTABLE_QUIRK_ARM_BROKEN_SH    BIT(6)
>>       unsigned long            quirks;
>>       unsigned long            pgsize_bitmap;
>>       unsigned int            ias;
>>
>