From: Jason Gunthorpe <jgg@nvidia.com>
To: Leon Romanovsky <leon@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
Leon Romanovsky <leonro@nvidia.com>,
Abdiel Janulgue <abdiel.janulgue@gmail.com>,
Alexander Potapenko <glider@google.com>,
Alex Gaynor <alex.gaynor@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>,
Danilo Krummrich <dakr@kernel.org>,
iommu@lists.linux.dev, Jason Wang <jasowang@redhat.com>,
Jens Axboe <axboe@kernel.dk>, Joerg Roedel <joro@8bytes.org>,
Jonathan Corbet <corbet@lwn.net>, Juergen Gross <jgross@suse.com>,
kasan-dev@googlegroups.com, Keith Busch <kbusch@kernel.org>,
linux-block@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-nvme@lists.infradead.org, linuxppc-dev@lists.ozlabs.org,
linux-trace-kernel@vger.kernel.org,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
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"Michael S. Tsirkin" <mst@redhat.com>,
Miguel Ojeda <ojeda@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
rust-for-linux@vger.kernel.org, Sagi Grimberg <sagi@grimberg.me>,
Stefano Stabellini <sstabellini@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
virtualization@lists.linux.dev, Will Deacon <will@kernel.org>,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH v4 06/16] iommu/dma: extend iommu_dma_*map_phys API to handle MMIO memory
Date: Thu, 28 Aug 2025 10:49:27 -0300 [thread overview]
Message-ID: <20250828134927.GE9469@nvidia.com> (raw)
In-Reply-To: <4f84639baf6d5d0e107fd2001dff91b6538ff9ae.1755624249.git.leon@kernel.org>
On Tue, Aug 19, 2025 at 08:36:50PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
>
> Combine iommu_dma_*map_phys with iommu_dma_*map_resource interfaces in
> order to allow single phys_addr_t flow.
>
> In the following patches, the iommu_dma_map_resource() will be removed
> in favour of iommu_dma_map_phys(..., attrs | DMA_ATTR_MMIO) flow.
I would reword this a little bit
iommu/dma: implement DMA_ATTR_MMIO for iommu_dma_(un)map_phys()
Make iommu_dma_map_phys() and iommu_dma_unmap_phys() respect
DMA_ATTR_MMIO.
DMA_ATTR_MMIO makes the functions behave the same as
iommu_dma_(un)map_resource():
- No swiotlb is possible
- No cache flushing is done (ATTR_MMIO should not be cached memory)
- prot for iommu_map() has IOMMU_MMIO not IOMMU_CACHE
This is preperation for replacing iommu_dma_map_resource() callers
with iommu_dma_map_phys(DMA_ATTR_MMIO) and removing
iommu_dma_(un)map_resource().
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Jason
next prev parent reply other threads:[~2025-08-28 13:49 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-19 17:36 [PATCH v4 00/16] dma-mapping: migrate to physical address-based API Leon Romanovsky
2025-08-19 17:36 ` [PATCH v4 01/16] dma-mapping: introduce new DMA attribute to indicate MMIO memory Leon Romanovsky
2025-08-28 13:03 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 02/16] iommu/dma: implement DMA_ATTR_MMIO for dma_iova_link() Leon Romanovsky
2025-08-19 17:36 ` [PATCH v4 03/16] dma-debug: refactor to use physical addresses for page mapping Leon Romanovsky
2025-08-28 13:19 ` Jason Gunthorpe
2025-09-05 16:26 ` Marek Szyprowski
2025-08-19 17:36 ` [PATCH v4 04/16] dma-mapping: rename trace_dma_*map_page to trace_dma_*map_phys Leon Romanovsky
2025-08-28 13:27 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 05/16] iommu/dma: rename iommu_dma_*map_page to iommu_dma_*map_phys Leon Romanovsky
2025-08-28 13:38 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 06/16] iommu/dma: extend iommu_dma_*map_phys API to handle MMIO memory Leon Romanovsky
2025-08-28 13:49 ` Jason Gunthorpe [this message]
2025-08-19 17:36 ` [PATCH v4 07/16] dma-mapping: convert dma_direct_*map_page to be phys_addr_t based Leon Romanovsky
2025-08-28 14:19 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 08/16] kmsan: convert kmsan_handle_dma to use physical addresses Leon Romanovsky
2025-08-28 15:00 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 09/16] dma-mapping: handle MMIO flow in dma_map|unmap_page Leon Romanovsky
2025-08-28 15:17 ` Jason Gunthorpe
2025-08-31 13:12 ` Leon Romanovsky
2025-08-19 17:36 ` [PATCH v4 10/16] xen: swiotlb: Open code map_resource callback Leon Romanovsky
2025-08-28 15:18 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 11/16] dma-mapping: export new dma_*map_phys() interface Leon Romanovsky
2025-08-19 18:22 ` Keith Busch
2025-08-28 16:01 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 12/16] mm/hmm: migrate to physical address-based DMA mapping API Leon Romanovsky
2025-08-19 17:36 ` [PATCH v4 13/16] mm/hmm: properly take MMIO path Leon Romanovsky
2025-08-19 17:36 ` [PATCH v4 14/16] block-dma: migrate to dma_map_phys instead of map_page Leon Romanovsky
2025-08-19 18:20 ` Keith Busch
2025-08-19 18:49 ` Leon Romanovsky
2025-09-02 20:49 ` Marek Szyprowski
2025-09-02 21:59 ` Keith Busch
2025-09-02 23:24 ` Jason Gunthorpe
2025-08-19 17:36 ` [PATCH v4 15/16] block-dma: properly take MMIO path Leon Romanovsky
2025-08-19 18:24 ` Keith Busch
2025-08-28 15:19 ` Keith Busch
2025-08-28 16:54 ` Leon Romanovsky
2025-08-28 17:15 ` Keith Busch
2025-08-28 18:41 ` Jason Gunthorpe
2025-08-28 19:10 ` Keith Busch
2025-08-28 19:18 ` Jason Gunthorpe
2025-08-28 20:54 ` Keith Busch
2025-08-28 23:45 ` Jason Gunthorpe
2025-08-29 12:35 ` Keith Busch
2025-08-19 17:37 ` [PATCH v4 16/16] nvme-pci: unmap MMIO pages with appropriate interface Leon Romanovsky
2025-08-19 19:58 ` Keith Busch
2025-08-28 11:57 ` [PATCH v4 00/16] dma-mapping: migrate to physical address-based API Leon Romanovsky
2025-09-01 21:47 ` Marek Szyprowski
2025-09-01 22:23 ` Jason Gunthorpe
2025-09-02 9:29 ` Leon Romanovsky
2025-08-29 13:16 ` Jason Gunthorpe
2025-09-05 16:20 ` Marek Szyprowski
2025-09-05 17:38 ` Leon Romanovsky
2025-09-05 17:43 ` Jason Gunthorpe
2025-09-07 14:25 ` Takashi Sakamoto
2025-09-08 12:45 ` Jason Gunthorpe
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