Changes in V5: 1. Reorganize the vop_mmap function code in patch 1, which is done by Christoph. 2. Completely remove the unnecessary code related to reassign the used ring for card in patch 2.
The original vop driver only supports dma coherent device, as it allocates and maps vring by _get_free_pages and dma_map_single, but not use dma_sync_single_for_cpu/device to sync the updates of device_page/vring between EP and RC, which will cause memory synchronization problem for device don't support hardware dma coherent. And allocate vrings use dma_alloc_coherent is a common way in kernel, as the memory interacted between two systems should use consistent memory to avoid caching effects. So here add noncoherent platform support for vop driver. Also add some related dma changes to make sure noncoherent platform works well. Sherry Sun (2): misc: vop: change the way of allocating vrings and device page misc: vop: do not allocate and reassign the used ring drivers/misc/mic/bus/vop_bus.h | 2 + drivers/misc/mic/host/mic_boot.c | 9 ++ drivers/misc/mic/host/mic_main.c | 43 ++------ drivers/misc/mic/vop/vop_debugfs.c | 4 - drivers/misc/mic/vop/vop_main.c | 70 +----------- drivers/misc/mic/vop/vop_vringh.c | 166 ++++++++++------------------- include/uapi/linux/mic_common.h | 9 +- 7 files changed, 85 insertions(+), 218 deletions(-) -- 2.17.1
