linux-kernel - RE: [PATCH 02/10] iommu/vt-d: Set IOASID capacity when SVM is enabled

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Date:   Fri, 27 Mar 2020 08:08:30 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Eric Auger <eric.auger@...hat.com>
Subject: RE: [PATCH 02/10] iommu/vt-d: Set IOASID capacity when SVM is
 enabled

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Thursday, March 26, 2020 1:55 AM
> 
> Assign system-wide PASID capacity with enumerated max value.
> Currently, all Intel SVM capable devices should support full 20 bits of
> PASID value.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  drivers/iommu/intel-iommu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index a699a765c983..ec3fc121744a 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -3510,6 +3510,10 @@ static int __init init_dmars(void)
>  	if (ret)
>  		goto free_iommu;
> 
> +	/* PASID is needed for scalable mode irrespective to SVM */
> +	if (intel_iommu_sm)
> +		ioasid_install_capacity(intel_pasid_max_id);
> +
>  	/*
>  	 * for each drhd
>  	 *   enable fault log
> --
> 2.7.4

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