From: Matthew Rosato <mjrosato@linux.ibm.com>
To: Niklas Schnelle <schnelle@linux.ibm.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Jason Gunthorpe <jgg@nvidia.com>,
Wenjia Zhang <wenjia@linux.ibm.com>
Cc: Gerd Bayer <gbayer@linux.ibm.com>,
Pierre Morel <pmorel@linux.ibm.com>,
iommu@lists.linux.dev, linux-s390@vger.kernel.org,
borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,
gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
svens@linux.ibm.com, linux-kernel@vger.kernel.org,
Julian Ruess <julianr@linux.ibm.com>
Subject: Re: [PATCH v7 4/6] s390/pci: Use dma-iommu layer
Date: Tue, 21 Feb 2023 16:05:20 -0500 [thread overview]
Message-ID: <ace6750d-c2ff-dffa-ef0a-3face3f17f28@linux.ibm.com> (raw)
In-Reply-To: <20230220152222.1818344-5-schnelle@linux.ibm.com>
On 2/20/23 10:22 AM, Niklas Schnelle wrote:
> While s390 already has a standard IOMMU driver and previous changes have
> added I/O TLB flushing operations this driver is currently only used for
> user-space PCI access such as vfio-pci. For the DMA API s390 instead
> utilizes its own implementation in arch/s390/pci/pci_dma.c which drives
> the same hardware and shares some code but requires a complex and
> fragile hand over between DMA API and IOMMU API use of a device and
> despite code sharing still leads to significant duplication and
> maintenance effort. Let's utilize the common code DMAP API
> implementation from drivers/iommu/dma-iommu.c instead allowing us to
> get rid of arch/s390/pci/pci_dma.c.
>
> Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
next prev parent reply other threads:[~2023-02-21 21:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-20 15:22 [PATCH v7 0/6] iommu/dma: s390 DMA API conversion and optimized IOTLB flushing Niklas Schnelle
2023-02-20 15:22 ` [PATCH v7 1/6] s390/ism: Set DMA coherent mask Niklas Schnelle
2023-02-20 15:22 ` [PATCH v7 2/6] iommu: Allow .iotlb_sync_map to fail and handle s390's -ENOMEM return Niklas Schnelle
2023-02-20 15:22 ` [PATCH v7 3/6] s390/pci: prepare is_passed_through() for dma-iommu Niklas Schnelle
2023-02-20 15:22 ` [PATCH v7 4/6] s390/pci: Use dma-iommu layer Niklas Schnelle
2023-02-21 21:05 ` Matthew Rosato [this message]
2023-02-20 15:22 ` [PATCH v7 5/6] iommu/dma: Allow a single FQ in addition to per-CPU FQs Niklas Schnelle
2023-02-20 15:22 ` [PATCH v7 6/6] iommu/dma: Make flush queue sizes and timeout driver configurable Niklas Schnelle
2023-03-07 13:16 ` [PATCH v7 0/6] iommu/dma: s390 DMA API conversion and optimized IOTLB flushing Niklas Schnelle
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