linux-kernel - Re: [PATCH v5 0/2] Add support for multiple coherent memory regions

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Date: Mon, 11 Mar 2024 12:03:10 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Howard Yen <howardyen@...gle.com>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, mathias.nyman@...el.com,
	hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
	petr.tesarik.ext@...wei.com, broonie@...nel.org, james@...iv.tech,
	james.clark@....com, masahiroy@...nel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: Re: [PATCH v5 0/2] Add support for multiple coherent memory regions

On Mon, Mar 11, 2024 at 09:49:45AM +0000, Howard Yen wrote:
> In the system I'm working on, there is an always-on subsystem which
> includes a small size memory, and several functions need to run and
> occupy the memory from the small memory if they need to run on the
> always-on subsystem. These functions must allocate the memory from the
> small memory region, so that they can get benefit from the always-on
> subsystem. So the small memory is split for multiple functions which are
> satisfied with their generic use cases. But in specific use cases, like
> USB3 devices which support the stream trasnsfer or multiple devices
> connect to the host, they required more memory than their pre-allocated
> memory region. I tried to implement it in a generic way and propose this
> patch to give it the ability to get the memory from the other larger
> memory to solve the issue.

> Changelog
> --------------------------------------------
> Changes in v5:
> - Fix build break.
> - Use of_property_count_u32_elems() instead of
>   of_property_count_elems_of_size().

Have you tried to use --histogram diff algo?

-- 
With Best Regards,
Andy Shevchenko