linux-kernel - Re: [PATCH] nvme-pci: Use non-operational power state instead of D3 on Suspend-to-Idle

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Message-ID: <20190508191624.GA8365@localhost.localdomain>
Date:   Wed, 8 May 2019 13:16:24 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     keith.busch@...el.com, axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mario Limonciello <mario.limonciello@...l.com>
Subject: Re: [PATCH] nvme-pci: Use non-operational power state instead of D3
 on Suspend-to-Idle

On Thu, May 09, 2019 at 02:59:55AM +0800, Kai-Heng Feng wrote:
> +static int nvme_do_resume_from_idle(struct pci_dev *pdev)
> +{
> +	struct nvme_dev *ndev = pci_get_drvdata(pdev);
> +	int result;
> +
> +	pdev->dev_flags &= ~PCI_DEV_FLAGS_NO_D3;
> +	ndev->ctrl.suspend_to_idle = false;
> +
> +	result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
> +	if (result < 0)
> +		goto out;
> +
> +	result = nvme_pci_configure_admin_queue(ndev);
> +	if (result)
> +		goto out;
> +
> +	result = nvme_alloc_admin_tags(ndev);
> +	if (result)
> +		goto out;
> +
> +	ndev->ctrl.max_hw_sectors = NVME_MAX_KB_SZ << 1;
> +	ndev->ctrl.max_segments = NVME_MAX_SEGS;
> +	mutex_unlock(&ndev->shutdown_lock);

This lock was never locked.

But I think these special suspend/resume routines are too similar to the
existing ones, they should just incorporate this feature if we need to
do this.