scsi: storvsc: Re-init stor_chns when a channel interrupt is re-assigned
For each storvsc_device, storvsc keeps track of the channel target CPUs
associated to the device (alloced_cpus) and it uses this information to
fill a "cache" (stor_chns) mapping CPU->channel according to a certain
heuristic. Update the alloced_cpus mask and the stor_chns array when a
channel of the storvsc device is re-assigned to a different CPU.
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: <linux-scsi@vger.kernel.org>
Link: https://lore.kernel.org/r/20200406001514.19876-12-parri.andrea@gmail.com
Reviewed-by; Long Li <longli@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
[ wei: fix a small issue reported by kbuild test robot <lkp@intel.com> ]
Signed-off-by: Wei Liu <wei.liu@kernel.org>
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index b85d7580..cd64ab7b 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -773,6 +773,9 @@ struct vmbus_channel {
void (*onchannel_callback)(void *context);
void *channel_callback_context;
+ void (*change_target_cpu_callback)(struct vmbus_channel *channel,
+ u32 old, u32 new);
+
/*
* Synchronize channel scheduling and channel removal; see the inline
* comments in vmbus_chan_sched() and vmbus_reset_channel_cb().
