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Add experimental support for the VideoCore shared memory service. This allows user processes to allocate memory from VideoCore's GPU relocatable heap and mmap the buffers. Additionally, the memory handles can passed to other VideoCore services such as MMAL, OpenMax and DispmanX TODO * This driver was originally released for BCM28155 which has a different cache architecture to BCM2835. Consequently, in this release only uncached mappings are supported. However, there's no fundamental reason which cached mappings cannot be support or BCM2835 * More refactoring is required to remove the typedefs. * Re-enable the some of the commented out debug-fs statistics which were disabled when migrating code from proc-fs. * There's a lot of code to support sharing of VCSM in order to support Android. This could probably done more cleanly or perhaps just removed. Signed-off-by: Tim Gover <timgover@gmail.com> config: Disable VC_SM for now to fix hang with cutdown kernel vcsm: Use boolean as it cannot be built as module On building the bcm_vc_sm as a module we get the following error: v7_dma_flush_range and do_munmap are undefined in vc-sm.ko. Fix by making it not an option to build as module vcsm: Add ioctl for custom cache flushing vc-sm: Move headers out of arch directory Signed-off-by: Noralf Trønnes <noralf@tronnes.org> vcsm: Treat EBUSY as success rather than SIGBUS Currently if two cores access the same page concurrently one will return VM_FAULT_NOPAGE and the other VM_FAULT_SIGBUS crashing the user code. Also report when mapping fails. Signed-off-by: popcornmix <popcornmix@gmail.com> vcsm: Provide new ioctl to clean/invalidate a 2D block vcsm: Convert to loading via device tree. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> VCSM: New option to import a DMABUF for VPU use Takes a dmabuf, and then calls over to the VPU to wrap it into a suitable handle. Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> vcsm: fix multi-platform build vcsm: add macros for cache functions vcsm: use dma APIs for cache functions * Will handle multi-platform builds vcsm: Fix up macros to avoid breaking numbers used by existing apps