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Tofu: proper cleanup of device files when mcexec gets killed

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Change-Id: I6cb0290f72d96682700f945b29585e132e525ac1
This commit is contained in:
Balazs Gerofi
2020-09-08 13:30:32 +09:00
committed by Masamichi Takagi
parent 1918df7765
commit e5f4a4e87d
10 changed files with 489 additions and 40 deletions
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27
executer/kernel/mcctrl/ikc.c
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@@ -148,8 +148,29 @@ int mcctrl_ikc_send_wait(ihk_os_t os, int cpu, struct ikc_scd_packet *pisp,
}
if (timeout) {
ret = wait_event_interruptible_timeout(desc->wq,
desc->status, timeout);
/*
* Negative timeout indicates busy waiting, which can be used
* in situations where wait_event_interruptible_XXX() would
* fail, e.g., in a signal handler, at the time the process
* is being killed, etc.
*/
if (timeout < 0) {
unsigned long timeout_jiffies =
jiffies + msecs_to_jiffies(timeout * -1);
ret = -ETIME;
while (time_before(jiffies, timeout_jiffies)) {
schedule();
if (READ_ONCE(desc->status)) {
ret = 0;
break;
}
}
}
else {
ret = wait_event_interruptible_timeout(desc->wq,
desc->status, msecs_to_jiffies(timeout));
}
} else {
ret = wait_event_interruptible(desc->wq, desc->status);
}
@@ -211,6 +232,8 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
case SCD_MSG_PROCFS_ANSWER:
case SCD_MSG_REMOTE_PAGE_FAULT_ANSWER:
case SCD_MSG_CPU_RW_REG_RESP:
case SCD_MSG_CLEANUP_PROCESS_RESP:
case SCD_MSG_CLEANUP_FD_RESP:
mcctrl_wakeup_cb(__os, pisp);
break;