From: Baolu Lu <baolu.lu@linux.intel.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
iommu@lists.linux.dev, Jason Gunthorpe <jgg@nvidia.com>,
Joerg Roedel <joro@8bytes.org>,
dmaengine@vger.kernel.org, vkoul@kernel.org
Cc: baolu.lu@linux.intel.com, Robin Murphy <robin.murphy@arm.com>,
Will Deacon <will@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Raj Ashok <ashok.raj@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
"Yu, Fenghua" <fenghua.yu@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Tony Luck <tony.luck@intel.com>,
"Zanussi, Tom" <tom.zanussi@intel.com>,
narayan.ranganathan@intel.com
Subject: Re: [PATCH v6 1/4] iommu: Generalize default PCIe requester ID PASID
Date: Sun, 21 May 2023 14:21:48 +0800 [thread overview]
Message-ID: <ab7d4bfc-d599-0875-cbdd-0be8cc5d9d7f@linux.intel.com> (raw)
In-Reply-To: <20230519203223.2777255-2-jacob.jun.pan@linux.intel.com>
On 5/20/23 4:32 AM, Jacob Pan wrote:
> PCIe Process address space ID (PASID) is used to tag DMA traffic, it
> provides finer grained isolation than requester ID (RID).
>
> For each RID, 0 is as a special PASID for the legacy DMA (without
> PASID), thus RID_PASID. This is universal across all architectures,
> therefore warranted to be declared in the common header.
> Noting that VT-d could support none-zero RID_PASID, but currently not
> used.
>
> By having a common RID_PASID, we can avoid conflicts between different
> use cases in the generic code. e.g. SVA and DMA API with PASIDs.
>
> Signed-off-by: Jacob Pan<jacob.jun.pan@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Best regards,
baolu
next prev parent reply other threads:[~2023-05-21 6:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-19 20:32 [PATCH v6 0/4] Re-enable IDXD kernel workqueue under DMA API Jacob Pan
2023-05-19 20:32 ` [PATCH v6 1/4] iommu: Generalize default PCIe requester ID PASID Jacob Pan
2023-05-21 6:21 ` Baolu Lu [this message]
2023-05-23 14:47 ` Jean-Philippe Brucker
2023-05-23 15:26 ` Jacob Pan
2023-05-29 19:50 ` Jason Gunthorpe
2023-05-19 20:32 ` [PATCH v6 2/4] iommu: Move global PASID allocation from SVA to core Jacob Pan
2023-05-21 6:21 ` Baolu Lu
2023-05-22 17:32 ` Jacob Pan
2023-05-29 19:43 ` Jason Gunthorpe
2023-05-19 20:32 ` [PATCH v6 3/4] iommu/vt-d: Add set_dev_pasid callback for dma domain Jacob Pan
2023-05-29 19:48 ` Jason Gunthorpe
2023-05-30 2:19 ` Baolu Lu
2023-05-30 16:55 ` Jason Gunthorpe
2023-05-31 4:02 ` Baolu Lu
2023-05-19 20:32 ` [PATCH v6 4/4] dmaengine/idxd: Re-enable kernel workqueue under DMA API Jacob Pan
2023-05-21 6:29 ` Baolu Lu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ab7d4bfc-d599-0875-cbdd-0be8cc5d9d7f@linux.intel.com \
--to=baolu.lu@linux.intel.com \
--cc=ashok.raj@intel.com \
--cc=dave.jiang@intel.com \
--cc=dmaengine@vger.kernel.org \
--cc=dwmw2@infradead.org \
--cc=fenghua.yu@intel.com \
--cc=iommu@lists.linux.dev \
--cc=jacob.jun.pan@linux.intel.com \
--cc=jgg@nvidia.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=narayan.ranganathan@intel.com \
--cc=robin.murphy@arm.com \
--cc=tom.zanussi@intel.com \
--cc=tony.luck@intel.com \
--cc=vkoul@kernel.org \
--cc=will@kernel.org \
--cc=yi.l.liu@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).