From be5d926b5c10430671ae975b80efb7a5652e3f9a Mon Sep 17 00:00:00 2001 From: Oded Gabbay Date: Sat, 16 Feb 2019 00:39:15 +0200 Subject: habanalabs: add command buffer module This patch adds the command buffer (CB) module, which allows the user to create and destroy CBs and to map them to the user's process address-space. A command buffer is a memory blocks that reside in DMA-able address-space and is physically contiguous so it can be accessed by the device without MMU translation. The command buffer memory is allocated using the coherent DMA API. When creating a new CB, the IOCTL returns a handle of it, and the user-space process needs to use that handle to mmap the buffer to get a VA in the user's address-space. Before destroying (freeing) a CB, the user must unmap the CB's VA using the CB handle. Each CB has a reference counter, which tracks its usage in command submissions and also its mmaps (only a single mmap is allowed). The driver maintains a pool of pre-allocated CBs in order to reduce latency during command submissions. In case the pool is empty, the driver will go to the slow-path of allocating a new CB, i.e. calling dma_alloc_coherent. Reviewed-by: Mike Rapoport Signed-off-by: Oded Gabbay Signed-off-by: Greg Kroah-Hartman --- drivers/misc/habanalabs/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/misc/habanalabs/Makefile') diff --git a/drivers/misc/habanalabs/Makefile b/drivers/misc/habanalabs/Makefile index 3ffbadc2ca01..2530c9b78ca4 100644 --- a/drivers/misc/habanalabs/Makefile +++ b/drivers/misc/habanalabs/Makefile @@ -4,7 +4,8 @@ obj-m := habanalabs.o -habanalabs-y := habanalabs_drv.o device.o context.o asid.o +habanalabs-y := habanalabs_drv.o device.o context.o asid.o habanalabs_ioctl.o \ + command_buffer.o include $(src)/goya/Makefile habanalabs-y += $(HL_GOYA_FILES) -- cgit