lwn.git/drivers/gpu/drm/msm/msm_iommu.c, branch standardize-docs

drm/msm: pm runtime support for iommu

2017-04-08T10:59:31+00:00

In particular, attach() and unmap() need pm-runtime get/put to ensure iommu clks are enabled. Signed-off-by: Rob Clark

drm/msm: convert to iommu_map_sg

2017-04-08T10:59:31+00:00

Significantly simplifies things. Also iommu_unmap() can unmap an entire iova range. (If backporting to downstream kernel you might need to revert this. Or at least double check older iommu implementation.) Signed-off-by: Rob Clark

drm/msm: let gpu wire up it's own fault handler

2017-02-06T16:28:42+00:00

Signed-off-by: Rob Clark

drm/msm: convert iova to 64b

2016-11-28T20:14:08+00:00

For a5xx the gpu is 64b so we need to change iova to 64b everywhere. On the display side, iova is still 32b so it can ignore the upper bits. (Although all the armv8 devices have an iommu that can map 64b pa to 32b iova.) Signed-off-by: Rob Clark

drm/msm: Print the correct virtual addresses in map/unmap funcs

2016-07-16T14:08:44+00:00

The msm_iommu_map/unmap funcs have debug prints to show the list of VA:PA mappings. Use the correct variable to print the VAs. Signed-off-by: Archit Taneja Signed-off-by: Rob Clark

drm/msm: Use correct type for physical addresses

2016-07-16T14:08:34+00:00

The u32 type used to pass the physical addresses to iommu_map can't accommodate 64 bit addresses. Move to dma_addr_t to ensure wrong addresses aren't provided to the IOMMU driver. Signed-off-by: Archit Taneja Signed-off-by: Rob Clark

drm/msm: make iommu port names const'ier

2016-03-02T21:19:43+00:00

Signed-off-by: Rob Clark

drm/msm: Fix a couple of 64-bit build warnings

2015-05-14T15:19:25+00:00

Avoid casts from pointers to fixed-size integers to prevent the compiler from warning. Print virtual memory addresses using %p instead. Also turn a couple of %d/%x specifiers into %zu/%zd/%zx to avoid further warnings due to mismatched format strings. Signed-off-by: Thierry Reding Reviewed-by: Rob Clark

drm/msm: avoid flood of kernel logs on faults

2014-08-26T14:43:31+00:00

87e956e9 changed the fault handler to return -ENOSYS, which causes the iommu driver to print out a huge splat. Which wouldn't be quite so bad if nothing ever faulted. But seems like some EXA composite operations generate quite a lot of (seemingly harmless) faults. That is probably a userspace problem, but the huge increase in verbosity from iommu fault dumps makes things kind of unusable. We probably should actually log *some* message (not conditional on drm.debug). But ratelimit it. Signed-off-by: Rob Clark

drm/msm: use upstream iommu

2014-08-04T15:55:29+00:00

Downstream kernel IOMMU had a non-standard way of dealing with multiple devices and multiple ports/contexts. We don't need that on upstream kernel, so rip out the crazy. Note that we have to move the pinning of the ringbuffer to after the IOMMU is attached. No idea how that managed to work properly on the downstream kernel. For now, I am leaving the IOMMU port name stuff in place, to simplify things for folks trying to backport latest drm/msm to device kernels. Once we no longer have to care about pre-DT kernels, we can drop this and instead backport upstream IOMMU driver. Signed-off-by: Rob Clark