AM5718: OpenCL例程无法运行

junkun Zhang

Part Number: AM5718

我按照openCL_lab.docx此文件所提示的步骤，执行./simple例程，报错如下：

root@am57xx-evm:/data/opencl/simple# ./simple
[ 3007.285048] CMEMK Error: mmap: can't find allocated buffer with physp 0xa2000000
CMEM Error: map: Failed to mmap buffer at physical address 0xa2000000
TIOCL FATAL: Cannot map CMEM physical memory (0xa2000000, 160 MB) into the Host virtual address space.
This is typically due to Linux system memory being near capacity.

我在源码中增加了一些打印项，发现是在执行下面这一句的时候出的错。

Context context(CL_DEVICE_TYPE_ACCELERATOR);

我已经把dsp1的固件连接到了dra7-dsp1-fw.xe66.opencl-monitor

我的目的就是想用DSP作为一个算法加速器，请问还需要做什么别的操作才可以正常运行吗？

3 年多前

0 junkun Zhang 3 年多前

我发现是因为dtb中增加了两个cmem_block导致的：

reserved-memory {
cmem_block_mem_2: cmem_block_mem@c0000000 {
reg = <0x0 0xc0000000 0x0 0x20000000>;
no-map;
status = "okay";
};
cmem_block_mem_0: cmem_block_mem@a0000000 {
reg = <0x0 0xa0000000 0x0 0x0c000000>;
no-map;
status = "okay";
};
};

cmem {
cmem_block_2: cmem_block@2 {
reg = <2>;
memory-region = <&cmem_block_mem_2>;
cmem-buf-pools = <1 0x0 0x20000000>;
};

cmem_block_0: cmem_block@0 {
reg = <0>;
memory-region = <&cmem_block_mem_0>;
cmem-buf-pools = <1 0x0 0x0c000000>;
};
};

删掉这些cmem就不会报以上错误，但是还是会报以下错误：

root@am57xx-evm:/data/opencl/simple# ./simple
CMEM Error: init: Failed to open /dev/cmem: 'No such file or directory'
TIOCL FATAL: The cmemk kernel module is not installed. Consult the OpenCL UserGuide at software-dl.ti.com/.../index.html
root@am57xx-evm:/data/opencl/simple#

那么cmemk kernel 要如何安装呢？

另外我那两个cmem_block也是需要有的，如何可以两者兼得？

0 junkun Zhang 3 年多前回复 junkun Zhang

我把dtb改为如下设置

reserved-memory {
#address-cells = <2>;
#size-cells = <2>;
ranges;

cmem_block_mem_2: cmem_block_mem@c0000000 {
reg = <0x0 0xc0000000 0x0 0x20000000>;
no-map;
status = "okay";
};
cmem_block_mem_1_ocmc3: cmem_block_mem@40500000 {
reg = <0x0 0x40500000 0x0 0x100000>;
no-map;
status = "okay";
};

ipu2_memory_region: ipu2-memory@95800000 {
compatible = "shared-dma-pool";
reg = <0x0 0x95800000 0x0 0x3800000>;
reusable;
status = "okay";
};

dsp1_memory_region: dsp1-memory@99000000 {
compatible = "shared-dma-pool";
reg = <0x0 0x99000000 0x0 0x4000000>;
reusable;
status = "okay";
};

ipu1_memory_region: ipu1-memory@9d000000 {
compatible = "shared-dma-pool";
reg = <0x0 0x9d000000 0x0 0x2000000>;
reusable;
status = "okay";
};
};
cmem {
compatible = "ti,cmem";
#address-cells = <1>;
#size-cells = <0>;

#pool-size-cells = <2>;

status = "okay";

cmem_block_2: cmem_block@2 {
reg = <2>;
memory-region = <&cmem_block_mem_2>;
cmem-buf-pools = <1 0x0 0x20000000>;
};
cmem_block_1: cmem_block@1 {
reg = <1>;
memory-region = <&cmem_block_mem_1_ocmc3>;
};
};

报错变为了：

root@am57xx-evm:/data/opencl/simple# ./simple
TIOCL FATAL: OpenCL needs at least one CMEM block in off-chip DDR to operate, plus optional CMEM block in on-chip (MSMC SRAM or OCMC RAM) memory.

程序卡在里面出不来，ctrl+c也不行了。按理说我已经添加了cmem_block_mem_1_ocmc3，怎么还会报错呢？