linux-kernel - Re: Query related to shutting down NVMe during system suspend

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Message-ID: <20220209214718.GC1616420@dhcp-10-100-145-180.wdc.com>
Date:   Wed, 9 Feb 2022 13:47:18 -0800
From:   Keith Busch <kbusch@...nel.org>
To:     nitirawa@...eaurora.org
Cc:     Vidya Sagar <vidyas@...dia.com>, rafael.j.wysocki@...el.com,
        keith.busch@...el.com, hch@....de, bhelgaas@...gle.com,
        mmaddireddy@...dia.com, kthota@...dia.com, sagar.tv@...il.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Query related to shutting down NVMe during system suspend

On Thu, Feb 10, 2022 at 02:47:47AM +0530, nitirawa@...eaurora.org wrote:
> IMO, the NVME driver is not associated with any device tree, Instead PCI
> driver is associated with device tree.

That may be good, though: the idle behavior isn't unqiue to nvme. It may
be fine if PCI is the common layer to own this, as long as drivers can
query it.

> So unlike ACPI based platform where we have platform specific DMI matching,
> we don't have equivalent check for DT based platform.

Is there any existing kernel API a driver can call to uniquely identify
such a platform?

> Do we see any concern if we introduce a module param with default not set to
> quick suspend.

As of now, the idea was proposed and was not accepted.