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From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <Mark.Rutland@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"jacob.jun.pan@linux.intel.com" <jacob.jun.pan@linux.intel.com>,
	"joro@8bytes.org" <joro@8bytes.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"eric.auger@redhat.com" <eric.auger@redhat.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	Robin Murphy <Robin.Murphy@arm.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 3/8] iommu/arm-smmu-v3: Support platform SSID
Date: Wed, 19 Jun 2019 12:53:46 +0100
Message-ID: <73cfb797-5ae7-b9d9-01ea-fe98a1bed5c3@arm.com> (raw)
In-Reply-To: <20190618180851.GK4270@fuggles.cambridge.arm.com>

On 18/06/2019 19:08, Will Deacon wrote:
>> +	/*
>> +	 * If the SMMU doesn't support 2-stage CD, limit the linear
>> +	 * tables to a reasonable number of contexts, let's say
>> +	 * 64kB / sizeof(ctx_desc) = 1024 = 2^10
>> +	 */
>> +	if (!(smmu->features & ARM_SMMU_FEAT_2_LVL_CDTAB))
>> +		master->ssid_bits = min(master->ssid_bits, 10U);
> 
> Please introduce a #define for the 10, so that it is computed in the way
> you describe in the comment (a bit like we do for things like queue sizes).

Ok

>> +
>>  	group = iommu_group_get_for_dev(dev);
>>  	if (!IS_ERR(group)) {
>>  		iommu_group_put(group);
>> diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
>> index f04a6df65eb8..04f4f6b95d82 100644
>> --- a/drivers/iommu/of_iommu.c
>> +++ b/drivers/iommu/of_iommu.c
>> @@ -206,8 +206,12 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
>>  			if (err)
>>  				break;
>>  		}
>> -	}
>>  
>> +		fwspec = dev_iommu_fwspec_get(dev);
>> +		if (!err && fwspec)
>> +			of_property_read_u32(master_np, "pasid-num-bits",
>> +					     &fwspec->num_pasid_bits);
>> +	}
> 
> Hmm. Do you know if there's anything in ACPI for this?

Yes, IORT version D introduced a "substream width" field for the Named
component node (platform device). I don't think it existed last time I
checked, so I'll see about supporting it.

Thanks,
Jean

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Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10 18:47 [PATCH 0/8] iommu: Add auxiliary domain and PASID support to Arm SMMUv3 Jean-Philippe Brucker
2019-06-10 18:47 ` [PATCH 1/8] iommu: Add I/O ASID allocator Jean-Philippe Brucker
2019-06-11  9:36   ` Jonathan Cameron
2019-06-11 14:35     ` Jean-Philippe Brucker
2019-06-11 18:13       ` Jacob Pan
2019-06-18 14:22         ` Jean-Philippe Brucker
2019-06-18 17:05           ` Jacob Pan
2019-06-19 14:26             ` Jean-Philippe Brucker
2019-06-11 12:26   ` Jacob Pan
2019-06-11 14:37     ` Jean-Philippe Brucker
2019-06-11 17:10       ` Jacob Pan
2019-06-12 11:30         ` Jean-Philippe Brucker
2019-06-10 18:47 ` [PATCH 2/8] dt-bindings: document PASID property for IOMMU masters Jean-Philippe Brucker
2019-07-08  7:58   ` Auger Eric
2019-06-10 18:47 ` [PATCH 3/8] iommu/arm-smmu-v3: Support platform SSID Jean-Philippe Brucker
2019-06-11  9:42   ` Jonathan Cameron
2019-06-11 14:35     ` Jean-Philippe Brucker
2019-06-18 18:08   ` Will Deacon
2019-06-19 11:53     ` Jean-Philippe Brucker [this message]
2019-07-08  7:58   ` Auger Eric
2019-06-10 18:47 ` [PATCH 4/8] iommu/arm-smmu-v3: Add support for Substream IDs Jean-Philippe Brucker
2019-06-11 10:19   ` Jonathan Cameron
2019-06-11 14:35     ` Jean-Philippe Brucker
2019-06-26 18:00   ` Will Deacon
2019-07-04  9:33     ` Jean-Philippe Brucker
2019-07-08 15:31   ` Auger Eric
2019-06-10 18:47 ` [PATCH 5/8] iommu/arm-smmu-v3: Add second level of context descriptor table Jean-Philippe Brucker
2019-06-11 10:24   ` Jonathan Cameron
2019-07-08 15:13   ` Auger Eric
2019-06-10 18:47 ` [PATCH 6/8] iommu/arm-smmu-v3: Support auxiliary domains Jean-Philippe Brucker
2019-06-26 17:59   ` Will Deacon
2019-07-05 16:29     ` Jean-Philippe Brucker
2019-06-10 18:47 ` [PATCH 7/8] iommu/arm-smmu-v3: Improve add_device() error handling Jean-Philippe Brucker
2019-07-08  7:58   ` Auger Eric
2019-06-10 18:47 ` [PATCH 8/8] iommu/arm-smmu-v3: Add support for PCI PASID Jean-Philippe Brucker
2019-06-11 10:45   ` Jonathan Cameron
2019-06-11 14:35     ` Jean-Philippe Brucker
2019-07-08  7:58   ` Auger Eric

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