linux-kernel - Re: [PATCH v5 RESEND 1/2] dmaengine: qcom: gpi: Add GPI Block event interrupt support

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Message-ID: <sni4bawucwkeyy7lh45p364ngv6bjomv7wxq3qjek2mjd7ucal@tfoeom2qohj2>
Date: Thu, 20 Mar 2025 01:26:57 +0100
From: Andi Shyti <andi.shyti@...nel.org>
To: Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>
Cc: Vinod Koul <vkoul@...nel.org>, Sumit Semwal <sumit.semwal@...aro.org>, 
	Christian König <christian.koenig@....com>, linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org, linux-media@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, quic_msavaliy@...cinc.com, 
	quic_vtanuku@...cinc.com
Subject: Re: [PATCH v5 RESEND 1/2] dmaengine: qcom: gpi: Add GPI Block event
 interrupt support

Hi,

On Wed, Feb 12, 2025 at 05:35:35PM +0530, Jyothi Kumar Seerapu wrote:
> GSI hardware generates an interrupt for each transfer completion.
> For multiple messages within a single transfer, this results in
> N interrupts for N messages, leading to significant software
> interrupt latency.
> 
> To mitigate this latency, utilize Block Event Interrupt (BEI) mechanism.
> Enabling BEI instructs the GSI hardware to prevent interrupt generation
> and BEI is disabled when an interrupt is necessary.
> 
> When using BEI, consider splitting a single multi-message transfer into
> chunks of 8 messages internally and so interrupts are not expected for
> the first 7 message completions, only the last message triggers
> an interrupt, indicating the completion of 8 messages.
> 
> This BEI mechanism enhances overall transfer efficiency.
> 
> Signed-off-by: Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>

Acked-by: Andi Shyti <andi.shyti@...nel.org>

Vinod any chance you can check this patch, please?

Andi