Hello, This patch-series makes GART driver one step closer to become actually usable by addressing the following: 1. Thierry noticed that Memory Controller driver uses registers that belong to GART in [0] and for now MC driver only reports the fact of GART's page fault. The first two patches of the series are addressing this shortcoming by providing integration of the MC driver with the GART. [0] https://www.spinics.net/lists/linux-tegra/msg33072.html 2. Currently GART has bee kept disabled by the commit c7e3ca515e784 ("iommu/tegra: gart: Do not register with bus"). If GART is re-enabled than all devices in the system are getting assigned to the GART as it is a global systems IOMMU provider. This is wrong simply because GART doesn't handle all those devices. This series makes GART to accept only devices that are explicitly assigned to GART in device tree using 'iommu' phandle. 3. This series makes a generic clean up of the driver, like removing dead code. 4. This series introduces and utilizes iotlb_sync_map() callback that was previously suggested by Joerg Roedel in [1], optimizing mapping / unmapping performance. [1] https://www.spinics.net/lists/linux-tegra/msg32914.html Changelog: v2: Addressed review comments from Robin Murphy to v1 by moving devices iommu_fwspec check to gart_iommu_add_device(). Dropped the "Provide single domain and group for all devices" patch from the series for now because after some more considering it became not exactly apparent whether that is what we need, that was also suggested by Robin Murphy in the review comment. Maybe something like a runtime IOMMU usage for devices would be a better solution, allowing to implement transparent context switching of virtual IOMMU domains. Some very minor code cleanups, reworded commit messages. Dmitry Osipenko (8): memory: tegra: Provide facility for integration with the GART driver iommu/tegra: gart: Provide access to Memory Controller driver iommu/tegra: gart: Clean up drivers module code iommu/tegra: gart: Remove pr_fmt and clean up includes iommu/tegra: gart: Clean up driver probe errors handling iommu/tegra: gart: Ignore devices without IOMMU phandle in DT iommu: Introduce iotlb_sync_map callback iommu/tegra: gart: Optimize mapping / unmapping performance drivers/iommu/iommu.c | 8 ++- drivers/iommu/tegra-gart.c | 99 +++++++++++++++++++++++--------------- drivers/memory/tegra/mc.c | 26 ++++++++-- include/linux/iommu.h | 1 + include/soc/tegra/mc.h | 13 +++++ 5 files changed, 103 insertions(+), 44 deletions(-) -- 2.18.0 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
