failed to allocate memory for node 'linux,cma'

khang_letruong — Sat, 04 Mar 2023 04:34:19 GMT

Dear Community,

I am bringing up an iMX8M Plus based board having 1GB DDR capacity :

root@viperimx8mp:~# free total used free shared buff/cache available Mem: 968116 115580 771180 10556 81356 761580 Swap: 0 0 0

I also adjusted the memory layout in custom .dtsi as below :

+ +#include "imx8mp.dtsi" + +/ { + memory@40000000 { + device_type = "memory"; + reg = <0x0 0x40000000 0 0x40000000>; + }; + + resmem: reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + + ocram: ocram@900000 { + no-map; + reg = <0 0x900000 0 0x70000>; + }; + +/* + * Memory reserved for optee usage. Please do not use. + * This will be automaticky added to dtb if OP-TEE is installed. + * optee@56000000 { + * reg = <0 0x56000000 0 0x2000000>; + * no-map; + * }; + */ + /* global autoconfigured region for contiguous allocations */ + linux,cma { + compatible = "shared-dma-pool"; + reusable; + size = <0 0x3c000000>; + alloc-ranges = <0 0x40000000 0 0x40000000>; + linux,cma-default; + }; + + dsp_reserved: dsp@92400000 { + reg = <0 0x92400000 0 0x1000000>; + no-map; + }; + dsp_reserved_heap: dsp_reserved_heap { + reg = <0 0x93400000 0 0xef0000>; + no-map; + }; + dsp_vdev0vring0: vdev0vring0@942f0000 { + reg = <0 0x942f0000 0 0x8000>; + no-map; + }; + dsp_vdev0vring1: vdev0vring1@942f8000 { + reg = <0 0x942f8000 0 0x8000>; + no-map; + }; + dsp_vdev0buffer: vdev0buffer@94300000 { + compatible = "shared-dma-pool"; + reg = <0 0x94300000 0 0x100000>; + no-map; + }; + + /* used only by tuning tool, can be removed for normal case */ + isp0_reserved: isp0@94400000 { + no-map; + reg = <0 0x94400000 0 0x10000000>; + }; + }; +};

However, I still have the following error :

root@viperimx8mp:~# dmesg | grep cma [ 0.000000] OF: reserved mem: failed to allocate memory for node 'linux,cma' [ 0.000000] cma: Reserved 32 MiB at 0x000000007c000000 [ 0.000000] Memory: 932468K/1015808K available (17920K kernel code, 1506K rwdata, 6920K rodata, 2880K init, 553K bss, 50572K reserved, 32768K cma-reserved)

Could anybody help to configure the memory layout to avoid this problem, please ? I am using BSP LF-5.10.52-2.1.0.

Thanks in advance and best regards,

Khang

Re: failed to allocate memory for node 'linux,cma'

khang_letruong — Mon, 06 Mar 2023 09:10:21 GMT

I think I found the root cause: allocating 960MB for CMA over 1GB of memory seems not practical.

Regards,
K.

topic failed to allocate memory for node 'linux,cma' in i.MX Processors

failed to allocate memory for node 'linux,cma'

Re: failed to allocate memory for node 'linux,cma'