kernel/drivers/gpu/drm/tegra/gem.c, branch linux-4.1.y

dma-buf: cleanup dma_buf_export() to make it easily extensible

2015-04-21T09:17:16Z

At present, dma_buf_export() takes a series of parameters, which makes it difficult to add any new parameters for exporters, if required. Make it simpler by moving all these parameters into a struct, and pass the struct * as parameter to dma_buf_export(). While at it, unite dma_buf_export_named() with dma_buf_export(), and change all callers accordingly. Reviewed-by: Maarten Lankhorst Reviewed-by: Daniel Thompson Acked-by: Mauro Carvalho Chehab Acked-by: Dave Airlie Signed-off-by: Sumit Semwal

drm/tegra: gem: oops in error handling

2015-01-27T09:14:41Z

kfree(ERR_PTR(-ENOMEM)) will not work very well. Signed-off-by: Dan Carpenter Signed-off-by: Thierry Reding

drm/tegra: gem: Use iommu_map_sg()

2015-01-27T09:14:34Z

The iommu_map_sg() function is now available in the IOMMU API, so drop the open-coded variant. Signed-off-by: Thierry Reding

drm/tegra: gem: Use the proper size for GEM objects

2014-12-17T13:27:38Z

If the requested buffer size wasn't a multiple of the page size, the IOMMU code would round down the size to the next multiple of the page size, thereby causing translation errors. To fix this we no longer pass around the requested size but reuse the computed size of the GEM object. This is already rounded to the next page boundary, so mapping that size works out fine. Signed-off-by: Thierry Reding

drm/tegra: gem: Flush buffer objects upon allocation

2014-12-17T13:27:37Z

Buffers obtained via shmem may still have associated cachelines. If they aren't properly flushed they may cause framebuffer corruption if the cache gets flushed after the application has drawn to it. Signed-off-by: Thierry Reding

drm/tegra: gem: Check before freeing CMA memory

2014-11-13T15:18:34Z

dma_free_writecombine() must not be called on a buffer that couldn't be allocated. Check for a valid virtual address before attempting to free the memory to avoid a crash. Reported-by: Sean Paul Reviewed-by: Sean Paul Signed-off-by: Thierry Reding

drm/tegra: gem: Use more consistent data types

2014-11-13T15:18:32Z

Use size_t consistently for sizes and u32/u64 instead of uint32_t and uint64_t. Signed-off-by: Thierry Reding

drm/tegra: gem: dumb: pitch and size are outputs

2014-11-13T15:18:31Z

When creating a dumb buffer object using the DRM_IOCTL_MODE_CREATE_DUMB IOCTL, only the width, height, bpp and flags parameters are inputs. The caller is not guaranteed to zero out or set handle, pitch and size, so the driver must not treat these values as possible inputs. Fixes a bug where running the Weston compositor on Tegra DRM would cause an attempt to allocate a 3 GiB framebuffer to be allocated. Fixes: de2ba664c30f ("gpu: host1x: drm: Add memory manager and fb") Cc: stable@vger.kernel.org Signed-off-by: Thierry Reding

drm/tegra: Add IOMMU support

2014-11-13T15:14:48Z

When an IOMMU device is available on the platform bus, allocate an IOMMU domain and attach the display controllers to it. The display controllers can then scan out non-contiguous buffers by mapping them through the IOMMU. Signed-off-by: Thierry Reding

drm/tegra: gem: Use dma_mmap_writecombine()

2014-11-13T15:14:48Z

Use the existing API rather than open-coding equivalent functionality in the driver. Signed-off-by: Thierry Reding