linux-kernel - [PATCH RFC 0/1] Support CMA regions

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Message-ID: <20240710084200.6561-1-shun-yi.wang@mediatek.com>
Date: Wed, 10 Jul 2024 16:41:59 +0800
From: Shun-yi Wang <shun-yi.wang@...iatek.com>
To: Bjorn Andersson <andersson@...nel.org>, Mathieu Poirier
	<mathieu.poirier@...aro.org>
CC: Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>,
	<linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	<jason-ch.chen@...iatek.com>, <yaya.chang@...iatek.com>,
	<teddy.chen@...iatek.com>, shun-yi.wang <shun-yi.wang@...iatek.com>
Subject: [PATCH RFC 0/1] Support CMA regions

From: "shun-yi.wang" <shun-yi.wang@...iatek.com>

In order to reserve specific Contiguous Memory Allocator (CMA) regions 
for hardware use. When the name of the reserved region contains "cma", 
then a corresponding CMA heap is added.

In the DTS (Device Tree Source), we may have several memory regions 
with different names, e.g.,
&scp {
	...
	memory-region = <&mem_reserved_1>, <&mem_reserved_2>;
};

mem_reserved_1: xxx-xxx-region {
	...
};
mem_reserved_2: xxx-xxx-cma-region {
	...
};

When the name of the region contains "cma", a corresponding heap 
allocator is added by cma_heap_add().
However, we are unsure if using the name "cma" as an identifier
is a good practice.
I sincerely hope that you can provide me some suggestions, thanks.
Especially within the segment of '#ifdef CONFIG_DMA_BUF_HEAPS_CMA'

Note: The cma_heap_add() is introduced from this patch:
dma-buf: heaps: Introduce cma_heap_add() for non-default CMA heap

shun-yi.wang (1):
  remoteproc: mediatek: Support reserved CMA regions

 drivers/remoteproc/mtk_scp.c | 38 ++++++++++++++++++++++++++++--------
 1 file changed, 30 insertions(+), 8 deletions(-)

-- 
2.18.0