linux-kernel - RE: [PATCH v2 08/12] iommu/vt-d: Pass pasid table to context mapping

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Date:   Thu, 6 Sep 2018 03:17:52 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>
CC:     "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, "Sun, Yi Y" <yi.y.sun@...el.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: RE: [PATCH v2 08/12] iommu/vt-d: Pass pasid table to context mapping

> From: Lu Baolu [mailto:baolu.lu@...ux.intel.com]
> Sent: Thursday, August 30, 2018 9:35 AM
> 
> So that the pasid related info, such as the pasid table and the
> maximum of pasid could be used during setting up scalable mode
> context.
> 
> Cc: Ashok Raj <ashok.raj@...el.com>
> Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Cc: Kevin Tian <kevin.tian@...el.com>
> Cc: Liu Yi L <yi.l.liu@...el.com>
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Ashok Raj <ashok.raj@...el.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>

> ---
>  drivers/iommu/intel-iommu.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index c3bf2ccf094d..33642dd3d6ba 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -1942,6 +1942,7 @@ static void domain_exit(struct dmar_domain
> *domain)
> 
>  static int domain_context_mapping_one(struct dmar_domain *domain,
>  				      struct intel_iommu *iommu,
> +				      struct pasid_table *table,
>  				      u8 bus, u8 devfn)
>  {
>  	u16 did = domain->iommu_did[iommu->seq_id];
> @@ -2064,6 +2065,7 @@ static int domain_context_mapping_one(struct
> dmar_domain *domain,
>  struct domain_context_mapping_data {
>  	struct dmar_domain *domain;
>  	struct intel_iommu *iommu;
> +	struct pasid_table *table;
>  };
> 
>  static int domain_context_mapping_cb(struct pci_dev *pdev,
> @@ -2072,25 +2074,31 @@ static int domain_context_mapping_cb(struct
> pci_dev *pdev,
>  	struct domain_context_mapping_data *data = opaque;
> 
>  	return domain_context_mapping_one(data->domain, data-
> >iommu,
> -					  PCI_BUS_NUM(alias), alias & 0xff);
> +					  data->table, PCI_BUS_NUM(alias),
> +					  alias & 0xff);
>  }
> 
>  static int
>  domain_context_mapping(struct dmar_domain *domain, struct device
> *dev)
>  {
> +	struct domain_context_mapping_data data;
> +	struct pasid_table *table;
>  	struct intel_iommu *iommu;
>  	u8 bus, devfn;
> -	struct domain_context_mapping_data data;
> 
>  	iommu = device_to_iommu(dev, &bus, &devfn);
>  	if (!iommu)
>  		return -ENODEV;
> 
> +	table = intel_pasid_get_table(dev);
> +
>  	if (!dev_is_pci(dev))
> -		return domain_context_mapping_one(domain, iommu, bus,
> devfn);
> +		return domain_context_mapping_one(domain, iommu,
> table,
> +						  bus, devfn);
> 
>  	data.domain = domain;
>  	data.iommu = iommu;
> +	data.table = table;
> 
>  	return pci_for_each_dma_alias(to_pci_dev(dev),
>  				      &domain_context_mapping_cb, &data);
> --
> 2.17.1