nvme-pci: try function level reset on init failure

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[ Upstream commit 5b2c214a95 ]

NVMe devices from multiple vendors appear to get stuck in a reset state
that we can't get out of with an NVMe level Controller Reset. The kernel
would report these with messages that look like:

  Device not ready; aborting reset, CSTS=0x1

These have historically required a power cycle to make them usable
again, but in many cases, a PCIe FLR is sufficient to restart operation
without a power cycle. Try it if the initial controller reset fails
during any nvme reset attempt.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Keith Busch 2025-07-15 12:16:27 -07:00 • committed by Greg Kroah-Hartman

parent 814cfdb635

commit bc255fec6f

1 changed files with 22 additions and 2 deletions

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drivers/nvme/host/pci.c

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