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__notify_syscall_requester(): use CAS or IKC to notify syscall completion

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This commit is contained in:
Balazs Gerofi
2016-08-16 08:56:05 +09:00
parent 5e9957da0f
commit c897a56c34
3 changed files with 68 additions and 1 deletions
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57
executer/kernel/mcctrl/syscall.c
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@ -241,6 +241,43 @@ out:
}
#endif
static int __notify_syscall_requester(ihk_os_t os, struct ikc_scd_packet *packet,
struct syscall_response *res)
{
struct mcctrl_usrdata *usrdata = ihk_host_os_get_usrdata(os);
struct ihk_ikc_channel_desc *c = (usrdata->channels + packet->ref)->c;
struct ikc_scd_packet r_packet;
int ret = 0;
/* If spinning, no need for IKC message */
if (__sync_bool_compare_and_swap(&res->req_thread_status,
IHK_SCD_REQ_THREAD_SPINNING,
IHK_SCD_REQ_THREAD_TO_BE_WOKEN)) {
dprintk("%s: no need to send IKC message for PID %d\n",
__FUNCTION__, packet->pid);
return ret;
}
/* The thread is not spinning any more, make sure it's descheduled */
if (!__sync_bool_compare_and_swap(&res->req_thread_status,
IHK_SCD_REQ_THREAD_DESCHEDULED,
IHK_SCD_REQ_THREAD_TO_BE_WOKEN)) {
printk("%s: WARNING: inconsistent requester status, "
"pid: %d, req status: %lu, syscall nr: %lu\n",
__FUNCTION__, packet->pid,
res->req_thread_status, packet->req.number);
dump_stack();
return -EINVAL;
}
r_packet.msg = SCD_MSG_WAKE_UP_SYSCALL_THREAD;
r_packet.ttid = packet->req.rtid;
ret = ihk_ikc_send(c, &r_packet, 0);
return ret;
}
static int remote_page_fault(struct mcctrl_usrdata *usrdata, void *fault_addr, uint64_t reason)
{
struct ikc_scd_packet *packet;
@ -274,7 +311,7 @@ static int remote_page_fault(struct mcctrl_usrdata *usrdata, void *fault_addr, u
req = &packet->req;
/* XXX: we need to map response structure here.. */
/* Map response structure */
phys = ihk_device_map_memory(ihk_os_to_dev(usrdata->os),
packet->resp_pa, sizeof(*resp));
resp = ihk_device_map_virtual(ihk_os_to_dev(usrdata->os),
@ -306,6 +343,12 @@ retry_alloc:
#define STATUS_PAGER_COMPLETED 1
#define STATUS_PAGE_FAULT 3
req->valid = 0;
if (__notify_syscall_requester(usrdata->os, packet, resp) < 0) {
printk("%s: WARNING: failed to notify PID %d\n",
__FUNCTION__, packet->pid);
}
mb();
resp->status = STATUS_PAGE_FAULT;
@ -363,6 +406,12 @@ retry_alloc:
#define PAGER_REQ_RESUME 0x0101
else if (req->args[0] != PAGER_REQ_RESUME) {
resp->ret = pager_call(usrdata->os, (void *)req);
if (__notify_syscall_requester(usrdata->os, packet, resp) < 0) {
printk("%s: WARNING: failed to notify PID %d\n",
__FUNCTION__, packet->pid);
}
mb();
resp->status = STATUS_PAGER_COMPLETED;
break;
@ -1301,6 +1350,12 @@ void __return_syscall(ihk_os_t os, struct ikc_scd_packet *packet,
/* Map response structure and notify offloading thread */
res->ret = ret;
res->stid = stid;
if (__notify_syscall_requester(os, packet, res) < 0) {
printk("%s: WARNING: failed to notify PID %d\n",
__FUNCTION__, packet->pid);
}
mb();
res->status = 1;