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authorCorey Minyard <cminyard@mvista.com>2014-04-14 09:46:54 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-17 12:23:07 -0700
commit89986496de141213206d49450ffdd36098d41209 (patch)
tree8e58ac04ee38226de409ad2f6594c83b9e18f59a /include/linux/ipmi_smi.h
parent0dfe6e7ed47feeb22f3cf8c7d8ac7e65bd4e87f5 (diff)
ipmi: Turn off all activity on an idle ipmi interface
The IPMI driver would wake up periodically looking for events and watchdog pretimeouts. If there is nothing waiting for these events, it's really kind of pointless to be checking for them. So modify the driver so the message handler can pass down if it needs the lower layer to be waiting for these. Modify the system interface lower layer to turn off all timer and thread activity if the upper layer doesn't need anything and it is not currently handling messages. And modify the message handler to not restart the timer if its timer is not needed. The timers and kthread will still be enabled if: - the SI interface is handling a message. - a user has enabled watching for events. - the IPMI watchdog timer is in use (since it uses pretimeouts). - the message handler is waiting on a remote response. - a user has registered to receive commands. This mostly affects interfaces without interrupts. Interfaces with interrupts already don't use CPU in the system interface when the interface is idle. Signed-off-by: Corey Minyard <cminyard@mvista.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/ipmi_smi.h')
-rw-r--r--include/linux/ipmi_smi.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/ipmi_smi.h b/include/linux/ipmi_smi.h
index 8ea3fe0b9759..2a7ff302d990 100644
--- a/include/linux/ipmi_smi.h
+++ b/include/linux/ipmi_smi.h
@@ -109,6 +109,13 @@ struct ipmi_smi_handlers {
events from the BMC we are attached to. */
void (*request_events)(void *send_info);
+ /* Called by the upper layer when some user requires that the
+ interface watch for events, received messages, watchdog
+ pretimeouts, or not. Used by the SMI to know if it should
+ watch for these. This may be NULL if the SMI does not
+ implement it. */
+ void (*set_need_watch)(void *send_info, int enable);
+
/* Called when the interface should go into "run to
completion" mode. If this call sets the value to true, the
interface should make sure that all messages are flushed