diff options
| author | Keith Busch <kbusch@kernel.org> | 2026-01-20 21:52:27 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-01-30 10:27:42 +0100 |
| commit | 7dfb39b0186ddd929400686fbacfb9b0915888d7 (patch) | |
| tree | c150e920f8ef735a1a7213f9a3e5df37f02858b4 /include/linux | |
| parent | ca88419cf0623dcdbb2beacb8fad30206ed7faf3 (diff) | |
nvme-pci: do not directly handle subsys reset fallout
[ Upstream commit 210b1f6576e8b367907e7ff51ef425062e1468e4 ]
Scheduling reset_work after a nvme subsystem reset is expected to fail
on pcie, but this also prevents potential handling the platform's pcie
services may provide that might successfully recovering the link without
re-enumeration. Such examples include AER, DPC, and power's EEH.
Provide a pci specific operation that safely initiates a subsystem
reset, and instead of scheduling reset work, read back the status
register to trigger a pcie read error.
Since this only affects pci, the other fabrics drivers subscribe to a
generic nvmf subsystem reset that is exactly the same as before. The
loop fabric doesn't use it because nvmet doesn't support setting that
property anyway.
And since we're using the magic NSSR value in two places now, provide a
symbolic define for it.
Reported-by: Nilay Shroff <nilay@linux.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Stable-dep-of: 0edb475ac0a7 ("nvme: fix PCIe subsystem reset controller state transition")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/nvme.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/nvme.h b/include/linux/nvme.h index b61038de139e..e88b02fff7f2 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -28,6 +28,9 @@ #define NVME_NSID_ALL 0xffffffff +/* Special NSSR value, 'NVMe' */ +#define NVME_SUBSYS_RESET 0x4E564D65 + enum nvme_subsys_type { /* Referral to another discovery type target subsystem */ NVME_NQN_DISC = 1, |