How to allocate memory which can be specified as NON-cacheable?

[kc]

Hi,

I want allocate non-cacheable physical memory for usage in the driver,
(ie. I don't want the data being cached into the CPU's data cache when
the data are accessed)
how could I do this?

there are functions like kmalloc(), get_free_pages, vmalloc, etc,
but how could specify the data is NOT cacheable when call these
functions?

Thanks!

kc

[kc]

[Vladimir Murzin]

Hi!

Have you tried dma_alloc_coherent()? According to [1] it should satisfy your needs.

1. http://www.mjmwired.net/kernel/Documentation/DMA-API.txt

Best wishes
Vladimir Murzin
Best wishes,
Vladimir Murzin

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