1.将RKNPU驱动移植到Openharmony内核
本文以rk3568为例，将RKNPU驱动移植到Openharmony使用的kernel 5.10中
开发环境
- DAYU200 rk3568开发板
- OpenHarmony 4.1 Release 64位系统
文档约定：
4.1r_3568为OpenHarmony标准系统源码根目录
1.0 环境准备
1.搭建OpenHarmony标准系统开发环境：https://forums.openharmony.cn/forum.php?mod=viewthread&tid=897
2.hdc工具：https://forums.openharmony.cn/forum.php?mod=viewthread&tid=1458
- 下载地址：http://ci.openharmony.cn/workbench/cicd/dailybuild/dailylist
1.1 移植准备:得到一份完整的kernel代码
OpenHarmony标准系统4.1r使用的是kernel 5.10的内核，在此基线基础上，回合CVE补丁及OpenHarmony特性，作为OpenHarmony Common Kernel基线。针对不同的芯片，各厂商合入对应的板级驱动补丁，完成对OpenHarmony的基线适配。
所以要把npu驱动移植到kernel 5.10,首先得有一份完整的rk3568 kernel5.10代码。所以我们需要手动把4.1r_3568/kernel/linux/patches/linux-5.10/rk3568_patch/kernel.patch打进/4.1r_3568/kernel/linux/linux-5.10内核中
cd 4.1r_3568/kernel/linux/linux-5.10
patch -p1 < /home/jiajiahao/OpenHarmony/4.1r_3568/kernel/linux/patches/linux-5.10/rk3568_patch/kernel.patch
2.然后注释掉/4.1r_3568/device/board/hihope/rk3568/kernel/build_kernel.sh中的patch -p1 < ${KERNEL_PATCH}
然后就可以在4.1r_3568/kernel/linux/linux-5.10中得到一份完整的rk3568 kernel 5.10代码，在此内核代码基础上进行修改，移植npu的驱动.
1.2 内核移植
1.获取npu驱动源码：https://github.com/rockchip-linux/kernel 选择5.10分支，NPU驱动位于：drivers/rknpu
本样例使用的npu驱动，请查看本目录rknpu
2.修改//kernel/linux/config/linux-5.10/rk3568/arch/arm64_defconfig文件，添加RKNPU的CONFIG配置
#
# RKNPU
#
CONFIG_ROCKCHIP_RKNPU=y
CONFIG_ROCKCHIP_RKNPU_DEBUG_FS=y
CONFIG_ROCKCHIP_RKNPU_DRM_GEM=y
3.将驱动代码drivers/rknpu移植到4.1r_3568/kernel/linux/linux-5.10/drivers目录中
4.修改drivers目录下的Makefile文件,添加如下内容
source "drivers/rknpu/Kconfig"
5.修改drivers目录下的Kconfig文件,添加如下内容
obj-$(CONFIG_ROCKCHIP_RKNPU) += rknpu/
6.修改kernel/linux/linux-5.10/drivers/iommu/rockchip-iommu.h，修改好的rockchip_iommu.h位于本目录下:rockchip_iommu.h
7.修改kernel/linux/linux-5.10/include/soc/rockchip/rockchip_iommu.c，修改好的rockchip_iommu.c位于本目录下:rockchip-iommu.c
8.修改kernel/linux/linux-5.10/drivers/soc/rockchip/rockchip_opp_select.c,修改好的rockchip_opp_select.c位于本目录下:rockchip_opp_select.c
9.修改kernel/linux/linux-5.10/include/soc/rockchip/rockchip_opp_select.h,修改好的rockchip_opp_select.h位于本目录下:rockchip_opp_select.h
10.kernel/linux/linux-5.10/drivers/rknpu/rknpu_drv.c中将MONITOR_TYPE_DEV改为MONITOR_TPYE_DEV
11.修改kernel/linux/linux-5.10/drivers/rknpu/rknpu_devfreq.c
将
static int rk3588_npu_set_read_margin(struct device *dev,
struct rockchip_opp_info *opp_info,
u32 rm)
修改为
static int rk3588_npu_set_read_margin(struct device *dev,
struct rockchip_opp_info *opp_info,
unsigned long rm)
12.在kernel/linux/linux-5.10/arch/arm64/boot/dts/rockchip/rk3568.dtsi设备树文件中将npu注释打开
/* These power domains are grouped by VD_NPU */
/*pd_npu@RK3568_PD_NPU {
reg = <RK3568_PD_NPU>;
clocks = <&cru ACLK_NPU_PRE>,
<&cru HCLK_NPU_PRE>,
<&cru PCLK_NPU_PRE>;
pm_qos = <&qos_npu>;
};*/
改为
/* These power domains are grouped by VD_NPU */
pd_npu@RK3568_PD_NPU {
reg = <RK3568_PD_NPU>;
clocks = <&cru ACLK_NPU_PRE>,
<&cru HCLK_NPU_PRE>,
<&cru PCLK_NPU_PRE>;
pm_qos = <&qos_npu>;
};
1.2 npu移植简单验证
1.编译arm64的带有npu驱动的rk3568镜像
./build.sh --product-name rk3568 --ccache --no-prebuilt-sdk--target-cpu arm64
2.编译好的镜像位于/out/rk3568/packages/phone/images下
3.使用RKDevTool工具烧录镜像到DAYU200后，查看开机内核打印，有如下输出则内核npu驱动移植成功。
内核打印太多，通过hdc shell dmesg | grep "RKNPU"可能看不到以下输出
[ 7.675214] RKNPU fde40000.npu: Adding to iommu group 0
[ 7.676593] RKNPU fde40000.npu: RKNPU: rknpu iommu is enabled, using iommu mode
[ 7.677428] RKNPU fde40000.npu: can't request region for resource [mem 0xfde40000-0xfde4ffff]
[ 7.679266] [drm] Initialized rknpu 0.8.2 20220829 for fde40000.npu on minor 1
[ 7.679856] RKNPU fde40000.npu: Failed to get npu_leakage
[ 7.682441] RKNPU fde40000.npu: avs=0
[ 7.683024] RKNPU fde40000.npu: l=0 h=2147483647 hyst=5000 l_limit=0 h_limit=0 h_table=0
[ 7.683835] RKNPU fde40000.npu: failed to find power_model node
[ 7.683881] RKNPU fde40000.npu: RKNPU: failed to initialize power model
[ 7.683912] RKNPU fde40000.npu: RKNPU: failed to get dynamic-coefficient
