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/* -----------------------------------------------------------------------------
* Copyright (c) 2011 Ozmo Inc
* Released under the GNU General Public License Version 2 (GPLv2).
* -----------------------------------------------------------------------------
*/
#include "ozconfig.h"
#ifdef WANT_EVENT_TRACE
#include <linux/jiffies.h>
#include <linux/uaccess.h>
#include "oztrace.h"
#include "ozevent.h"
/*------------------------------------------------------------------------------
*/
unsigned long g_evt_mask = 0xffffffff;
/*------------------------------------------------------------------------------
*/
#define OZ_MAX_EVTS 2048 /* Must be power of 2 */
DEFINE_SPINLOCK(g_eventlock);
static int g_evt_in;
static int g_evt_out;
static int g_missed_events;
static struct oz_event g_events[OZ_MAX_EVTS];
/*------------------------------------------------------------------------------
* Context: process
*/
void oz_event_init(void)
{
oz_trace("Event tracing initialized\n");
g_evt_in = g_evt_out = 0;
g_missed_events = 0;
}
/*------------------------------------------------------------------------------
* Context: process
*/
void oz_event_term(void)
{
oz_trace("Event tracing terminated\n");
}
/*------------------------------------------------------------------------------
* Context: any
*/
void oz_event_log2(u8 evt, u8 ctx1, u16 ctx2, void *ctx3, unsigned ctx4)
{
unsigned long irqstate;
int ix;
spin_lock_irqsave(&g_eventlock, irqstate);
ix = (g_evt_in + 1) & (OZ_MAX_EVTS - 1);
if (ix != g_evt_out) {
struct oz_event *e = &g_events[g_evt_in];
e->jiffies = jiffies;
e->evt = evt;
e->ctx1 = ctx1;
e->ctx2 = ctx2;
e->ctx3 = ctx3;
e->ctx4 = ctx4;
g_evt_in = ix;
} else {
g_missed_events++;
}
spin_unlock_irqrestore(&g_eventlock, irqstate);
}
/*------------------------------------------------------------------------------
* Context: process
*/
int oz_events_copy(struct oz_evtlist __user *lst)
{
int first;
int ix;
struct hdr {
int count;
int missed;
} hdr;
ix = g_evt_out;
hdr.count = g_evt_in - ix;
if (hdr.count < 0)
hdr.count += OZ_MAX_EVTS;
if (hdr.count > OZ_EVT_LIST_SZ)
hdr.count = OZ_EVT_LIST_SZ;
hdr.missed = g_missed_events;
g_missed_events = 0;
if (copy_to_user((void __user *)lst, &hdr, sizeof(hdr)))
return -EFAULT;
first = OZ_MAX_EVTS - ix;
if (first > hdr.count)
first = hdr.count;
if (first) {
int sz = first*sizeof(struct oz_event);
void __user *p = (void __user *)lst->evts;
if (copy_to_user(p, &g_events[ix], sz))
return -EFAULT;
if (hdr.count > first) {
p = (void __user *)&lst->evts[first];
sz = (hdr.count-first)*sizeof(struct oz_event);
if (copy_to_user(p, g_events, sz))
return -EFAULT;
}
}
ix += hdr.count;
if (ix >= OZ_MAX_EVTS)
ix -= OZ_MAX_EVTS;
g_evt_out = ix;
return 0;
}
/*------------------------------------------------------------------------------
* Context: process
*/
void oz_events_clear(void)
{
unsigned long irqstate;
spin_lock_irqsave(&g_eventlock, irqstate);
g_evt_in = g_evt_out = 0;
g_missed_events = 0;
spin_unlock_irqrestore(&g_eventlock, irqstate);
}
#endif /* WANT_EVENT_TRACE */
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