From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Baolu Lu <baolu.lu@linux.intel.com>
Cc: vkoul@kernel.org, "Tian, Kevin" <kevin.tian@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Raj Ashok <ashok.raj@intel.com>,
will@kernel.org, David Woodhouse <dwmw2@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@infradead.org>,
iommu@lists.linux-foundation.org,
Jason Gunthorpe <jgg@nvidia.com>,
dmaengine@vger.kernel.org,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
robin.murphy@arm.com
Subject: Re: [PATCH v4 2/6] iommu: Add a helper to do PASID lookup from domain
Date: Thu, 19 May 2022 13:10:37 -0700 [thread overview]
Message-ID: <20220519131037.08d7590f@jacob-builder> (raw)
In-Reply-To: <41c717e3-2965-67ac-9140-72f4b071cd9a@linux.intel.com>
Hi Baolu,
On Thu, 19 May 2022 14:41:06 +0800, Baolu Lu <baolu.lu@linux.intel.com>
wrote:
> > IOMMU group maintains a PASID array which stores the associated IOMMU
> > domains. This patch introduces a helper function to do domain to PASID
> > look up. It will be used by TLB flush and device-PASID attach
> > verification.
>
> Do you really need this?
>
> The IOMMU driver has maintained a device tracking list for each domain.
> It has been used for cache invalidation when unmap() is called against
> dma domain.
Yes, I am aware of the device list. In v3, I stored DMA API PASID in device
list of device_domain_info. Since we already have a pasid_array, Jason
suggested to share the storage with the code. This helper is needed to
reverse look up the DMA PASID based on the domain attached.
Discussions here:
https://lore.kernel.org/lkml/20220511170025.GF49344@nvidia.com/t/#mf7cb7d54d89e6e732a020dc22435260da0a49580
Thanks,
Jacob
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next prev parent reply other threads:[~2022-05-19 20:06 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 18:21 [PATCH v4 0/6] Enable PASID for DMA API users Jacob Pan
2022-05-18 18:21 ` [PATCH v4 1/6] iommu: Add a per domain PASID for DMA API Jacob Pan
2022-05-19 6:50 ` Baolu Lu
2022-05-24 13:50 ` Jason Gunthorpe via iommu
2022-05-24 15:17 ` Jacob Pan
2022-05-30 12:22 ` Jason Gunthorpe via iommu
2022-05-31 10:12 ` Tian, Kevin
2022-05-31 12:45 ` Baolu Lu
2022-05-31 16:03 ` Jason Gunthorpe via iommu
2022-05-31 17:29 ` Jacob Pan
2022-05-31 19:05 ` Jason Gunthorpe via iommu
2022-05-31 20:44 ` Jacob Pan
2022-06-01 1:50 ` Tian, Kevin
2022-06-01 1:43 ` Tian, Kevin
2022-06-01 9:37 ` Baolu Lu
2022-06-01 10:05 ` Tian, Kevin
2022-05-18 18:21 ` [PATCH v4 2/6] iommu: Add a helper to do PASID lookup from domain Jacob Pan
2022-05-19 6:41 ` Baolu Lu
2022-05-19 20:10 ` Jacob Pan [this message]
2022-05-19 6:48 ` Christoph Hellwig
2022-05-20 15:18 ` Jacob Pan
2022-05-23 7:55 ` Tian, Kevin
2022-05-23 9:14 ` Tian, Kevin
2022-05-23 18:01 ` Jacob Pan
2022-05-18 18:21 ` [PATCH v4 3/6] iommu/vt-d: Implement domain ops for attach_dev_pasid Jacob Pan
2022-05-24 13:51 ` Jason Gunthorpe via iommu
2022-05-24 16:12 ` Jacob Pan
2022-05-24 18:02 ` Jason Gunthorpe via iommu
2022-05-24 20:45 ` Jacob Pan
2022-05-24 21:10 ` Jason Gunthorpe via iommu
2022-05-18 18:21 ` [PATCH v4 4/6] iommu: Add PASID support for DMA mapping API users Jacob Pan
2022-05-23 8:25 ` Tian, Kevin
2022-05-23 15:23 ` Jacob Pan
2022-05-18 18:21 ` [PATCH v4 5/6] dmaengine: idxd: Use DMA API for in-kernel DMA with PASID Jacob Pan
2022-05-18 18:21 ` [PATCH v4 6/6] iommu/vt-d: Delete unused SVM flag Jacob Pan
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