netdev - Re: [PATCH net-next v5 12/15] net: airoha: Introduce Airoha NPU support

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Message-ID: <Z7hTujrG-zOiBcZe@lore-desk>
Date: Fri, 21 Feb 2025 11:21:46 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"Chester A. Unal" <chester.a.unal@...nc9.com>,
	Daniel Golle <daniel@...rotopia.org>,
	DENG Qingfang <dqfext@...il.com>, Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
	upstream@...oha.com
Subject: Re: [PATCH net-next v5 12/15] net: airoha: Introduce Airoha NPU
 support

On Feb 20, Jakub Kicinski wrote:
> On Mon, 17 Feb 2025 14:01:16 +0100 Lorenzo Bianconi wrote:
> > +static int airoha_npu_send_msg(struct airoha_npu *npu, int func_id,
> > +			       void *p, int size)
> > +{
> > +	u16 core = 0; /* FIXME */
> > +	u32 val, offset = core << 4;
> > +	dma_addr_t dma_addr;
> > +	void *addr;
> > +	int ret;
> > +
> > +	addr = kzalloc(size, GFP_ATOMIC | GFP_DMA);
> 
> You need the actual "zone DMA" memory from ISA times?
> I think that's what GFP_DMA is for. Any kmalloc'd memory
> can be DMA'ed to/from.

ack, I agree. We can drop it. I will fix it in v6.

> 
> > +	if (dma_set_coherent_mask(dev, 0xbfffffff))
> 
> Coherent mask is not contiguous on purpose?
> Quick grep reveals no such cases at present, not sure if it works.
> Maybe add a comment, at least ?

Ack, right. I think it is wrong. I will fix it in v6.

Regards,
Lorenzo

> -- 
> pw-bot: cr

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