From: Yisheng Xie <xieyisheng1@huawei.com>
To: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Cc: <joro@8bytes.org>, <robh+dt@kernel.org>, <mark.rutland@arm.com>,
<lorenzo.pieralisi@arm.com>, <hanjun.guo@linaro.org>,
<sudeep.holla@arm.com>, <rjw@rjwysocki.net>, <lenb@kernel.org>,
<will.deacon@arm.com>, <robin.murphy@arm.com>,
<robert.moore@intel.com>, <lv.zheng@intel.com>,
<iommu@lists.linux-foundation.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-acpi@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <devel@acpica.org>,
<liubo95@huawei.com>, <chenjiankang1@huawei.com>,
<xieyisheng@huawei.com>
Subject: Re: [RFC PATCH 6/6] iommu/arm-smmu-v3: Avoid ILLEGAL setting of STE.S1STALLD and CD.S
Date: Wed, 6 Sep 2017 10:23:00 +0800 [thread overview]
Message-ID: <de4599d6-277f-00d6-40e7-7ca43a2bf2b8@huawei.com> (raw)
In-Reply-To: <738977bb-4cd7-7d86-0ea0-0c88b6af721c@arm.com>
Hi Jean-Philippe,
On 2017/9/5 20:54, Jean-Philippe Brucker wrote:
> On 31/08/17 09:20, Yisheng Xie wrote:
>> It is ILLEGAL to set STE.S1STALLD if STALL_MODEL is not 0b00, which
>> means we should not disable stall mode if stall/terminate mode is not
>> configuable.
>>
>> Meanwhile, it is also ILLEGAL when STALL_MODEL==0b10 && CD.S==0 which
>> means if stall mode is force we should always set CD.S.
>>
>> This patch add ARM_SMMU_FEAT_TERMINATE feature bit for smmu, and use
>> TERMINATE feature checking to ensue above ILLEGAL cases from happening.
>>
>> Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
>> ---
>> drivers/iommu/arm-smmu-v3.c | 22 ++++++++++++++++------
>> 1 file changed, 16 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
>> index dbda2eb..0745522 100644
>> --- a/drivers/iommu/arm-smmu-v3.c
>> +++ b/drivers/iommu/arm-smmu-v3.c
>> @@ -55,6 +55,7 @@
>> #define IDR0_STALL_MODEL_SHIFT 24
>> #define IDR0_STALL_MODEL_MASK 0x3
>> #define IDR0_STALL_MODEL_STALL (0 << IDR0_STALL_MODEL_SHIFT)
>> +#define IDR0_STALL_MODEL_NS (1 << IDR0_STALL_MODEL_SHIFT)
>> #define IDR0_STALL_MODEL_FORCE (2 << IDR0_STALL_MODEL_SHIFT)
>> #define IDR0_TTENDIAN_SHIFT 21
>> #define IDR0_TTENDIAN_MASK 0x3
>> @@ -766,6 +767,7 @@ struct arm_smmu_device {
>> #define ARM_SMMU_FEAT_SVM (1 << 15)
>> #define ARM_SMMU_FEAT_HA (1 << 16)
>> #define ARM_SMMU_FEAT_HD (1 << 17)
>> +#define ARM_SMMU_FEAT_TERMINATE (1 << 18)
>
> I'd rather introduce something like "ARM_SMMU_FEAT_STALL_FORCE" instead.
> Terminate model has another meaning, and is defined by a different bit in
> IDR0.
Ok, sound more reasonable.
Thanks
Yisheng Xie
>
> Thanks,
> Jean
>
> .
>
next prev parent reply other threads:[~2017-09-06 2:24 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-31 8:20 [RFC PATCH 0/6] Add platform device SVM support for ARM SMMUv3 Yisheng Xie
2017-08-31 8:20 ` [RFC PATCH 1/6] dt-bindings: document stall and PASID properties for IOMMU masters Yisheng Xie
2017-09-05 12:52 ` Jean-Philippe Brucker
2017-08-31 8:20 ` [RFC PATCH 2/6] iommu/of: Add stall and pasid properties to iommu_fwspec Yisheng Xie
2017-09-05 12:52 ` Jean-Philippe Brucker
2017-08-31 8:20 ` [RFC PATCH 3/6] ACPI: IORT: " Yisheng Xie
2017-08-31 8:20 ` [RFC PATCH 4/6] iommu/arm-smmu-v3: Add SVM support for platform devices Yisheng Xie
2017-09-05 12:53 ` Jean-Philippe Brucker
2017-09-06 0:51 ` Bob Liu
2017-09-06 1:20 ` Yisheng Xie
2017-08-31 8:20 ` [RFC PATCH 5/6] iommu/arm-smmu-v3: fix panic when handle stall mode irq Yisheng Xie
2017-09-05 12:53 ` Jean-Philippe Brucker
2017-08-31 8:20 ` [RFC PATCH 6/6] iommu/arm-smmu-v3: Avoid ILLEGAL setting of STE.S1STALLD and CD.S Yisheng Xie
2017-09-05 12:54 ` Jean-Philippe Brucker
2017-09-06 2:23 ` Yisheng Xie [this message]
2017-09-13 3:06 ` Will Deacon
2017-09-13 10:11 ` Yisheng Xie
2017-09-13 15:47 ` Jean-Philippe Brucker
2017-09-13 17:11 ` Will Deacon
2017-09-05 12:56 ` [RFC PATCH 0/6] Add platform device SVM support for ARM SMMUv3 Jean-Philippe Brucker
2017-09-06 1:02 ` Bob Liu
2017-09-06 9:57 ` Jean-Philippe Brucker
2017-09-07 1:41 ` Bob Liu
2017-09-07 16:32 ` Jean-Philippe Brucker
2017-09-13 1:11 ` Bob Liu
2017-09-06 1:16 ` Yisheng Xie
2017-09-06 9:59 ` Jean-Philippe Brucker
2017-09-07 1:55 ` Bob Liu
2017-09-07 16:30 ` Jean-Philippe Brucker
2017-09-06 1:24 ` Hanjun Guo
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