linux-kernel - RE: [PATCH v10 2/7] iommu: Move global PASID allocation from SVA to core

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Date:   Thu, 13 Jul 2023 07:42:01 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Robin Murphy" <robin.murphy@....com>
CC:     Jason Gunthorpe <jgg@...dia.com>, Will Deacon <will@...nel.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>
Subject: RE: [PATCH v10 2/7] iommu: Move global PASID allocation from SVA to
 core

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Thursday, July 13, 2023 12:34 AM
> 
>  }
> +
> +ioasid_t iommu_alloc_global_pasid_dev(struct device *dev)
> +{
> +	int ret;
> +
> +	/* max_pasids == 0 means that the device does not support PASID */
> +	if (!dev->iommu->max_pasids)
> +		return IOMMU_PASID_INVALID;
> +
> +	/*
> +	 * max_pasids is set up by vendor driver based on number of PASID
> bits
> +	 * supported but the IDA allocation is inclusive.
> +	 */
> +	ret = ida_alloc_range(&iommu_global_pasid_ida,
> IOMMU_FIRST_GLOBAL_PASID,
> +			      dev->iommu->max_pasids - 1, GFP_KERNEL);
> +	return ret < 0 ? IOMMU_PASID_INVALID : ret;
> +}
> +EXPORT_SYMBOL_GPL(iommu_alloc_global_pasid_dev);

nit. Just call it iommu_alloc_global_pasid.