From: Vinod Koul <vkoul@kernel.org>
To: Dave Jiang <dave.jiang@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>,
iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>,
Christoph Hellwig <hch@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Jacob Pan <jacob.jun.pan@intel.com>,
Lu Baolu <baolu.lu@linux.intel.com>,
Raj Ashok <ashok.raj@intel.com>,
"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
Tony Luck <tony.luck@intel.com>, Yi Liu <yi.l.liu@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
Barry Song <21cnbao@gmail.com>,
"Zanussi, Tom" <tom.zanussi@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>
Subject: Re: [PATCH 4/4] dmaengine: idxd: Use DMA API for in-kernel DMA with PASID
Date: Wed, 8 Dec 2021 10:26:22 +0530 [thread overview]
Message-ID: <YbA69kdTgqB9tJc8@matsya> (raw)
In-Reply-To: <dbb90f20-d9fb-1f24-b59d-15a2a42437e2@intel.com>
On 07-12-21, 16:27, Dave Jiang wrote:
>
> On 12/7/2021 6:47 AM, Jacob Pan wrote:
> > In-kernel DMA should be managed by DMA mapping API. The existing kernel
> > PASID support is based on the SVA machinery in SVA lib that is intended
> > for user process SVA. The binding between a kernel PASID and kernel
> > mapping has many flaws. See discussions in the link below.
> >
> > This patch utilizes iommu_enable_pasid_dma() to enable DSA to perform DMA
> > requests with PASID under the same mapping managed by DMA mapping API.
> > In addition, SVA-related bits for kernel DMA are removed. As a result,
> > DSA users shall use DMA mapping API to obtain DMA handles instead of
> > using kernel virtual addresses.
> >
> > Link: https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@nvidia.com/
> > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
>
> Acked-by: Dave Jiang <dave.jiang@intel.com>
>
> Also cc Vinod and dmaengine@vger
Pls resend collecting acks. I dont have this in my queue
--
~Vinod
next prev parent reply other threads:[~2021-12-08 4:56 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 13:47 [PATCH 0/4] Enable PASID for DMA API users Jacob Pan
2021-12-07 13:47 ` [PATCH 1/4] ioasid: Reserve a global PASID for in-kernel DMA Jacob Pan
2021-12-09 11:03 ` Jean-Philippe Brucker
2021-12-09 18:14 ` Jacob Pan
2021-12-10 9:06 ` Jean-Philippe Brucker
2021-12-10 12:31 ` Jason Gunthorpe
2021-12-10 18:05 ` Jacob Pan
2021-12-11 8:39 ` Tian, Kevin
2021-12-12 23:34 ` Jason Gunthorpe
2021-12-07 13:47 ` [PATCH 2/4] iommu: Add PASID support for DMA mapping API users Jacob Pan
2021-12-08 2:31 ` Lu Baolu
2021-12-08 18:49 ` Jacob Pan
2021-12-09 1:56 ` Tian, Kevin
2021-12-09 2:21 ` Lu Baolu
2021-12-09 16:32 ` Jacob Pan
2021-12-09 16:57 ` Raj, Ashok
2021-12-09 17:34 ` Jacob Pan
2021-12-07 13:47 ` [PATCH 3/4] iommu/vt-d: Support PASID DMA for in-kernel usage Jacob Pan
2021-12-08 13:22 ` Jason Gunthorpe
2021-12-08 19:16 ` Jacob Pan
2021-12-09 2:32 ` Lu Baolu
2021-12-09 23:21 ` Jacob Pan
2021-12-09 23:41 ` Jason Gunthorpe
2021-12-10 6:46 ` Lu Baolu
2021-12-10 17:50 ` Jacob Pan
2021-12-10 17:48 ` Jason Gunthorpe
2021-12-10 18:18 ` Jacob Pan
2021-12-10 18:53 ` Jason Gunthorpe
2021-12-07 13:47 ` [PATCH 4/4] dmaengine: idxd: Use DMA API for in-kernel DMA with PASID Jacob Pan
2021-12-07 23:27 ` Dave Jiang
2021-12-08 4:56 ` Vinod Koul [this message]
2021-12-08 17:36 ` Jacob Pan
2021-12-08 13:13 ` Jason Gunthorpe
2021-12-08 15:35 ` Dave Jiang
2021-12-08 17:51 ` Jason Gunthorpe
2021-12-09 1:48 ` Tian, Kevin
2021-12-09 19:18 ` Jacob Pan
2021-12-08 19:55 ` Jacob Pan
2021-12-08 20:30 ` Jason Gunthorpe
2021-12-08 21:59 ` Jacob Pan
2021-12-08 23:39 ` Jason Gunthorpe
2021-12-09 0:12 ` Dave Jiang
2021-12-09 2:06 ` Tian, Kevin
2021-12-08 18:37 ` kernel test robot
2021-12-08 13:10 ` [PATCH 0/4] Enable PASID for DMA API users Jason Gunthorpe
2021-12-08 18:15 ` Jacob Pan
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