linux-kernel - Re: [PATCH 3/3] iommu/arm-smmu-v3: support suspend/resume

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Date: Mon, 25 Mar 2024 10:48:48 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>,
	Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>,
	Bixuan Cui <cuibixuan@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 3/3] iommu/arm-smmu-v3: support suspend/resume

On Sun, Mar 24, 2024 at 08:29:00PM +0800, Peng Fan (OSS) wrote:

> +static void arm_smmu_resume_unique_irqs(struct arm_smmu_device *smmu)
> +{
> +	struct device *dev = smmu->dev;
> +	struct msi_desc *desc;
> +	struct msi_msg msg;
> +
> +	if (!dev->msi.domain)
> +		return;
> +
> +	desc = irq_get_msi_desc(smmu->evtq.q.irq);
> +	if (desc) {
> +		get_cached_msi_msg(smmu->evtq.q.irq, &msg);
> +		arm_smmu_write_msi_msg(desc, &msg);
> +	}
> +
> +	desc = irq_get_msi_desc(smmu->gerr_irq);
> +	if (desc) {
> +		get_cached_msi_msg(smmu->gerr_irq, &msg);
> +		arm_smmu_write_msi_msg(desc, &msg);
> +	}
> +
> +	if (smmu->features & ARM_SMMU_FEAT_PRI) {
> +		desc = irq_get_msi_desc(smmu->priq.q.irq);
> +		if (desc) {
> +			get_cached_msi_msg(smmu->priq.q.irq, &msg);
> +			arm_smmu_write_msi_msg(desc, &msg);
> +		}
> +	}
> +}

I wonder if this should be done instead by converting the driver away
from platform MSI to the new MSI mechanism?

Jason