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authorUma Krishnan <ukrishn@linux.vnet.ibm.com>2017-06-22 05:14:30 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2017-06-26 22:01:08 +0300
commitc2c292f45029a6850cd14c7c2fa4fc479b8f74aa (patch)
treee73b1f0e026dd547e426aa1f4019c5895ad85ade /Documentation/powerpc
parent0b09e711189952ff9d411593a8d74ec12a956c57 (diff)
downloadlinux-c2c292f45029a6850cd14c7c2fa4fc479b8f74aa.tar.xz
scsi: cxlflash: Handle AFU sync failures
AFU sync operations are not currently evaluated for failure. This is acceptable for paths where there is not a dependency on the AFU being consistent with the host. Examples include link reset events and LUN cleanup operations. On paths where there is a dependency, such as a LUN open, a sync failure should be acted upon. In the event of AFU sync failures, either log or cleanup as appropriate for operations that are dependent on a successful sync completion. Update documentation to reflect behavior in the event of an AFU sync failure. Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com> Acked-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/cxlflash.txt12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/powerpc/cxlflash.txt b/Documentation/powerpc/cxlflash.txt
index 66b4496d6619..f9036cb0170d 100644
--- a/Documentation/powerpc/cxlflash.txt
+++ b/Documentation/powerpc/cxlflash.txt
@@ -257,6 +257,12 @@ DK_CXLFLASH_VLUN_RESIZE
operating in the virtual mode and used to program a LUN translation
table that the AFU references when provided with a resource handle.
+ This ioctl can return -EAGAIN if an AFU sync operation takes too long.
+ In addition to returning a failure to user, cxlflash will also schedule
+ an asynchronous AFU reset. Should the user choose to retry the operation,
+ it is expected to succeed. If this ioctl fails with -EAGAIN, the user
+ can either retry the operation or treat it as a failure.
+
DK_CXLFLASH_RELEASE
-------------------
This ioctl is responsible for releasing a previously obtained
@@ -309,6 +315,12 @@ DK_CXLFLASH_VLUN_CLONE
clone. This is to avoid a stale entry in the file descriptor table of the
child process.
+ This ioctl can return -EAGAIN if an AFU sync operation takes too long.
+ In addition to returning a failure to user, cxlflash will also schedule
+ an asynchronous AFU reset. Should the user choose to retry the operation,
+ it is expected to succeed. If this ioctl fails with -EAGAIN, the user
+ can either retry the operation or treat it as a failure.
+
DK_CXLFLASH_VERIFY
------------------
This ioctl is used to detect various changes such as the capacity of