heap: dma-buf: Add the dma-buf for Phytium NPU driver

This patch adds a new DMA-buf function since it has new private
date for the Phytium NPU.

Signed-off-by: yuanxia <yuanxia2073@phytium.com.cn>
Signed-off-by: Cheng Quan <chengquan@phytium.com.cn>
Signed-off-by: Wang Yinfeng <wangyinfeng@phytium.com.cn>

Author: yuanxia

MAINTAINERS

@@ -6170,9 +6170,11 @@ S:	Maintained
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/driver-api/dma-buf.rst
 F:	drivers/dma-buf/
+F:	drivers/dma-buf/heaps/phytium_npu_heap.c
 F:	include/linux/*fence.h
 F:	include/linux/dma-buf.h
 F:	include/linux/dma-resv.h
+F:	include/linux/phytium_npu_dma_buf_heap.h
 K:	\bdma_(?:buf|fence|resv)\b
 
 DMA GENERIC OFFLOAD ENGINE SUBSYSTEM

drivers/dma-buf/heaps/Kconfig

@@ -12,3 +12,11 @@ config DMABUF_HEAPS_CMA
 	  Choose this option to enable dma-buf CMA heap. This heap is backed
 	  by the Contiguous Memory Allocator (CMA). If your system has these
 	  regions, you should say Y here.
+
+config DMABUF_HEAPS_NPU_SYSTEM
+	bool "DMA-BUF for Phytium NPU system Heap"
+	depends on DMABUF_HEAPS && ARCH_PHYTIUM
+	help
+	  Choose this option to enable a new dma-buf system heap for the
+	  Phytium's NPU. The npu system heap is backed by pages from the buddy
+	  allocator. If your system has NPU driver, you should say Y here.

drivers/dma-buf/heaps/Makefile

@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_DMABUF_HEAPS_SYSTEM)	+= system_heap.o
 obj-$(CONFIG_DMABUF_HEAPS_CMA)		+= cma_heap.o
+obj-$(CONFIG_DMABUF_HEAPS_NPU_SYSTEM)		+= phytium_npu_heap.o