Le lun. 15 mai 2023 à 14:57, Robin Murphy <robin.murphy@xxxxxxx> a écrit : > > Hi all, > > For the sake of discussion, here's my irrational pet project to bring > the tegra-gart driver right up to date as an example of a > properly-implemented IOMMU driver for a non-isolated address space. Part > of that irrationality is that I don't even own any hardware which uses > this driver, so it's only build-tested :) > > Thanks, > Robin. > > > Robin Murphy (4): > iommu/tegra-gart: Add default identity domain support > iommu/tegra-gart: Improve domain support > iommu/tegra-gart: Generalise domain support > iommu: Clean up force_aperture confusion > > drivers/iommu/dma-iommu.c | 19 ++-- > drivers/iommu/mtk_iommu_v1.c | 4 + > drivers/iommu/sprd-iommu.c | 1 + > drivers/iommu/tegra-gart.c | 162 +++++++++++++++++++---------------- > 4 files changed, 99 insertions(+), 87 deletions(-) For what it worth, I've tried to test this serie with "grate patches" (1) rebased on top on 6.4-rc2, that would make use of the tegra-gart. That was on PAZ00 (with only 512M of RAM and 96M CMA still allocated). Unfortunately, this lead to the following errors with display problems (no character displayed in lxt-terminal and etc) [ 888.691348] tegra-mc 7000f000.memory-controller: gart: Page entry is in-use [ 888.698400] [drm:tegra_bo_gart_map_locked [tegra_drm]] *ERROR* mapping failed 4294967274 262144 [ 888.707365] [drm:tegra_bo_gart_map_locked [tegra_drm]] *ERROR* failed size 262144: -12 [ 888.716735] tegra-mc 7000f000.memory-controller: gart: Page entry is in-use [ 888.723800] [drm:tegra_bo_gart_map_locked [tegra_drm]] *ERROR* mapping failed 4294967274 262144 [ 888.733156] [drm:tegra_bo_gart_map_locked [tegra_drm]] *ERROR* failed size 262144: -12 [ 889.055247] tegra-mc 7000f000.memory-controller: gart: Page entry is in-use [ 889.062296] [drm:tegra_bo_gart_map_locked [tegra_drm]] *ERROR* mapping failed 4294967274 262144 [ 889.071266] [drm:tegra_bo_gart_map_locked [tegra_drm]] *ERROR* failed size 262144: -12 (1) https://github.com/grate-driver/linux
