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[Impact]
Intel Rapid Storage Technology hides NVMe behind AHCI controller, to
provide firmware base "fusion drive", like combining with Intel Optane.
There's a driver to support this but upstream doesn't like it for
reasons like NVMe quirks can't be applied when NVMe are behind AHCI
controller.
So we need to devise a mechanism to ask users to change BIOS storage
settings. This patch only provides a new attribute to let userspace like
distro installer know NVMe is remapped behind AHCI.
[Fix]
Add a new attribute to show that how many NVMes are remapped.
[Test]
After applying the patch, there's a new "remapped_nvme" under the AHCI PCI
device sysfs.
If there's no remapped NVMe:
$ cat remapped_nvme
0
If there are two remapped NVMes:
$ cat remapped_nvme
2
[Regression Potential]
Low. It adds a new read only sysfs attribute, no actual functional
change to the AHCI driver.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Add sysfs attribute to show remapped NVMe
https://bugs.launchpad.net/bugs/1863621
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