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

From: Thomas Gleixner <tglx@linutronix.de>
To: Jason Gunthorpe <jgg@ziepe.ca>, "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc: Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>, Marc Zyngier <maz@kernel.org>,
	Bixuan Cui <cuibixuan@huawei.com>,
	linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
	linux-kernel@vger.kernel.org, Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH 3/3] iommu/arm-smmu-v3: support suspend/resume
Date: Mon, 25 Mar 2024 18:29:03 +0100	[thread overview]
Message-ID: <87bk72fcf4.ffs@tglx> (raw)
In-Reply-To: <20240325134848.GA8419@ziepe.ca>

On Mon, Mar 25 2024 at 10:48, Jason Gunthorpe wrote:
> 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?

There is work in progress for that. Should come around in the next
weeks.

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