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[RFC,0/1] Support CMA regions

Message ID 20240710084200.6561-1-shun-yi.wang@mediatek.com (mailing list archive)
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Series Support CMA regions | expand

Message

Shun-Yi Wang (王順億) July 10, 2024, 8:41 a.m. UTC 
From: "shun-yi.wang" <shun-yi.wang@mediatek.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(-)