| Message ID | 20220511121544.5998-1-ajaykumar.rs@samsung.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | IOMMU-DMA - support DMA_ATTR_LOW_ADDRESS attribute | expand |
Ping! On Thu, May 12, 2022 at 9:09 AM Ajay Kumar <ajaykumar.rs@samsung.com> wrote: > > This patchset is a rebase of original patches from Marek Szyprowski: > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2321261.html > > The patches have been rebased on Joro's IOMMU tree "next" branch: > https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git > > This patchset is needed to address the IOVA address dependency issue between > firmware buffers and other buffers in Samsung s5p-mfc driver. > > There have been few discussions in the past on how to find a generic > soultion for this issue, ranging from adding an entirely new API to choose > IOVA window[1], to adding a DMA attribute DMA_ATTR_LOW_ADDRESS which handles > buffer allocation from lower address[2]. > This is a continuation of initial work from Marek for approach [2]. > Patches have been tested with latest version of Samsung s5p-mfc driver. > > Changes since V1: > [PATCH V2 1/6] > - Rebase on latest tree. > > [PATCH V2 2/6] > - Rebase on latest tree. > Added a missing check for iova_pfn in __iova_rcache_get() > Discard changes from drivers/iommu/intel/iommu.c which are not necessary > > [PATCH V2 3/6] > - Rebase on latest tree. > > [PATCH V2 4/6] > - Rebase on latest tree > > [PATCH V2 5/6] > - Rebase on latest tree > > [PATCH V2 6/6] > - Rebase on latest tree. > > Marek Szyprowski (6): > dma-mapping: add DMA_ATTR_LOW_ADDRESS attribute > iommu: iova: properly handle 0 as a valid IOVA address > iommu: iova: add support for 'first-fit' algorithm > iommu: dma-iommu: refactor iommu_dma_alloc_iova() > iommu: dma-iommu: add support for DMA_ATTR_LOW_ADDRESS > media: platform: s5p-mfc: use DMA_ATTR_LOW_ADDRESS > > References: > [1] > https://lore.kernel.org/linux-iommu/20200811054912.GA301@infradead.org/ > > [2] > https://lore.kernel.org/linux-mm/bff57cbe-2247-05e1-9059-d9c66d64c407@arm.com > > drivers/iommu/dma-iommu.c | 77 +++++++++++----- > drivers/iommu/iova.c | 91 ++++++++++++++++++- > .../media/platform/samsung/s5p-mfc/s5p_mfc.c | 8 +- > include/linux/dma-mapping.h | 6 ++ > include/linux/iova.h | 3 + > 5 files changed, 156 insertions(+), 29 deletions(-) > > > base-commit: faf93cfaadfaaff2a5c35d6301b45aa2f6e4ddb2 > -- > 2.17.1 >