Micron Confidential

Hi,

On Mon, Jul 05, 2021 at 01:53:49PM +0200, Christoph Hellwig wrote:

quoted

On Mon, Jul 05, 2021 at 11:15:51AM +0000, Shivamurthy Shastri

(sshivamurthy) wrote:

quoted

quoted

For systems with passive electronic components to handle power-

loss/battery-removal,

quoted

quoted

CC.SHN=10b will help to achieve safer shutdown with relatively lower power

back-up

quoted

quoted

requirements (at lower cost).

The module parameter gives flexibility to the host to decide shutdown type

even during

quoted

quoted

boot failure.

If you have a device that always prefers an abrupt please introduce a TP
in the NVMe technical working group so that the hosts automatically
do the right thing.  Requiring sysadmin intervention using a global
kernel parameter is not the way to do this.

The abrupt shutdown notification is already part of NVMe Specification.

Is it the device that wants an abrupt shutdown or the platform? If the
platform's power is running on limited back-up supply, and could inform
the kernel's power management subsystem of this, then a driver could use
that to determine if the quick shutdown is appropriate.

Yes, the platform is running on limited back-up supply. In this case, abrupt shutdown
option will help to achieve shutdown with relatively low back-up requirements.

Please let me know if you want to include the abrupt shutdown as part of 

static const struct dev_pm_ops nvme_dev_pm_ops = {
	.suspend	= nvme_suspend,
               .....


Thanks,
Shiva



Micron Confidential

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