Hi Greg, > Subject: Re: [PATCH V5 0/2] Change vring space from nomal memory to dma > coherent memory > > On Wed, Oct 28, 2020 at 10:03:03AM +0800, Sherry Sun wrote: > > 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(-) > > Have you all seen: > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F% > 2Flore.kernel.org%2Fr%2F8c1443136563de34699d2c084df478181c205db4.16 > 03854416.git.sudeep.dutt%40intel.com&data=04%7C01%7Csherry.sun% > 40nxp.com%7Cc19c987667434969847e08d87b0685e8%7C686ea1d3bc2b4c6f > a92cd99c5c301635%7C0%7C0%7C637394615238940323%7CUnknown%7CTW > FpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJX > VCI6Mn0%3D%7C1000&sdata=Zq%2FtHWTq%2BuIVBYXFGoeBmq0JJzYd > 9zDyv4NVN4TpC%2FU%3D&reserved=0 > > Looks like this code is asking to just be deleted, is that ok with you? Yes, I saw that patch. I'm ok with it. Best regards Sherry > > thanks, > > greg k-h
