/**
* Write a cpu syncpoint increment to the hardware, without touching
* the cache. Caller is responsible for host being powered.
*/
static void t20_syncpt_cpu_incr(struct nvhost_syncpt *sp, u32 id)
{
struct nvhost_master *dev = syncpt_to_dev(sp);
BUG_ON(!nvhost_module_powered(dev->dev));
if (!client_managed(id) && nvhost_syncpt_min_eq_max(sp, id)) {
dev_err(&syncpt_to_dev(sp)->pdev->dev,
"Syncpoint id %d\n",
id);
nvhost_debug_dump(syncpt_to_dev(sp));
BUG();
}
writel(BIT(id), dev->sync_aperture + HOST1X_SYNC_SYNCPT_CPU_INCR);
wmb();
}
/**
* Updates sw shadow state for client managed registers
*/
void nvhost_syncpt_save(struct nvhost_syncpt *sp)
{
u32 i;
BUG_ON(!(syncpt_op(sp).update_min && syncpt_op(sp).read_wait_base));
for (i = 0; i < sp->nb_pts; i++) {
if (client_managed(i))
syncpt_op(sp).update_min(sp, i);
else
BUG_ON(!nvhost_syncpt_min_eq_max(sp, i));
}
for (i = 0; i < sp->nb_bases; i++)
syncpt_op(sp).read_wait_base(sp, i);
}
/**
* Updates sw shadow state for client managed registers
*/
void nvhost_syncpt_save(struct nvhost_syncpt *sp)
{
u32 i;
for (i = 0; i < NV_HOST1X_SYNCPT_NB_PTS; i++) {
if (client_managed(i))
nvhost_syncpt_update_min(sp, i);
else
//BUG_ON(!nvhost_syncpt_min_eq_max(sp, i));
if (!nvhost_syncpt_min_eq_max(sp, i)) //A temporary workaround....
printk("BUG! sp=%p, i=%d",sp,i);
}
for (i = 0; i < NV_HOST1X_SYNCPT_NB_BASES; i++)
read_syncpt_wait_base(sp, i);
}
/**
* Updates sw shadow state for client managed registers
*/
void nvhost_syncpt_save(struct nvhost_syncpt *sp)
{
u32 i;
for (i = 0; i < NV_HOST1X_SYNCPT_NB_PTS; i++) {
if (client_managed(i))
nvhost_syncpt_update_min(sp, i);
else
BUG_ON(!nvhost_syncpt_min_eq_max(sp, i));
}
for (i = 0; i < NV_HOST1X_SYNCPT_NB_BASES; i++)
read_syncpt_wait_base(sp, i);
#ifdef CONFIG_MACH_N1
sp->restore_needed = true;
#endif
}
/**
* Main entrypoint for syncpoint value waits.
*/
int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp, u32 id,
u32 thresh, u32 timeout, u32 *value)
{
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
void *ref;
int err = 0;
if (value)
*value = 0;
BUG_ON(!check_max(sp, id, thresh));
/* first check cache */
if (nvhost_syncpt_min_cmp(sp, id, thresh)) {
if (value)
*value = nvhost_syncpt_read_min(sp, id);
return 0;
}
/* keep host alive */
nvhost_module_busy(&syncpt_to_dev(sp)->mod);
if (client_managed(id) || !nvhost_syncpt_min_eq_max(sp, id)) {
/* try to read from register */
u32 val = nvhost_syncpt_update_min(sp, id);
if ((s32)(val - thresh) >= 0) {
if (value)
*value = val;
goto done;
}
}
if (!timeout) {
err = -EAGAIN;
goto done;
}
/* schedule a wakeup when the syncpoint value is reached */
err = nvhost_intr_add_action(&(syncpt_to_dev(sp)->intr), id, thresh,
NVHOST_INTR_ACTION_WAKEUP_INTERRUPTIBLE, &wq, &ref);
if (err)
goto done;
err = -EAGAIN;
/* wait for the syncpoint, or timeout, or signal */
while (timeout) {
u32 check = min_t(u32, SYNCPT_CHECK_PERIOD, timeout);
int remain = wait_event_interruptible_timeout(wq,
nvhost_syncpt_min_cmp(sp, id, thresh),
check);
if (remain > 0 || nvhost_syncpt_min_cmp(sp, id, thresh)) {
if (value)
*value = nvhost_syncpt_read_min(sp, id);
err = 0;
break;
}
if (remain < 0) {
err = remain;
break;
}
if (timeout != NVHOST_NO_TIMEOUT)
timeout -= check;
if (timeout) {
dev_warn(&syncpt_to_dev(sp)->pdev->dev,
"syncpoint id %d (%s) stuck waiting %d\n",
id, nvhost_syncpt_name(id), thresh);
nvhost_syncpt_debug(sp);
}
};
nvhost_intr_put_ref(&(syncpt_to_dev(sp)->intr), ref);
done:
nvhost_module_idle(&syncpt_to_dev(sp)->mod);
return err;
}
/**
* Main entrypoint for syncpoint value waits.
*/
int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp, u32 id,
u32 thresh, u32 timeout, u32 *value)
{
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
void *ref;
void *waiter;
int err = 0, check_count = 0, low_timeout = 0;
static int print_once = 0;
if (value)
*value = 0;
BUG_ON(!syncpt_op(sp).update_min);
if (!nvhost_syncpt_check_max(sp, id, thresh)) {
dev_warn(&syncpt_to_dev(sp)->pdev->dev,
"wait %d (%s) for (%d) wouldn't be met (max %d)\n",
id, syncpt_op(sp).name(sp, id), thresh,
nvhost_syncpt_read_max(sp, id));
nvhost_debug_dump(syncpt_to_dev(sp));
return -EINVAL;
}
/* first check cache */
if (nvhost_syncpt_min_cmp(sp, id, thresh)) {
if (value)
*value = nvhost_syncpt_read_min(sp, id);
return 0;
}
/* keep host alive */
nvhost_module_busy(syncpt_to_dev(sp)->dev);
if (client_managed(id) || !nvhost_syncpt_min_eq_max(sp, id)) {
/* try to read from register */
u32 val = syncpt_op(sp).update_min(sp, id);
if ((s32)(val - thresh) >= 0) {
if (value)
*value = val;
goto done;
}
}
if (!timeout) {
err = -EAGAIN;
goto done;
}
/* schedule a wakeup when the syncpoint value is reached */
waiter = nvhost_intr_alloc_waiter();
if (!waiter) {
err = -ENOMEM;
goto done;
}
err = nvhost_intr_add_action(&(syncpt_to_dev(sp)->intr), id, thresh,
NVHOST_INTR_ACTION_WAKEUP_INTERRUPTIBLE, &wq,
waiter,
&ref);
if (err)
goto done;
err = -EAGAIN;
/* wait for the syncpoint, or timeout, or signal */
while (timeout) {
u32 check = min_t(u32, SYNCPT_CHECK_PERIOD, timeout);
int remain = wait_event_interruptible_timeout(wq,
nvhost_syncpt_min_cmp(sp, id, thresh),
check);
if (remain > 0 || nvhost_syncpt_min_cmp(sp, id, thresh)) {
if (value)
*value = nvhost_syncpt_read_min(sp, id);
err = 0;
break;
}
if (remain < 0) {
err = remain;
break;
}
if (timeout != NVHOST_NO_TIMEOUT) {
if (timeout < SYNCPT_CHECK_PERIOD) {
/* Caller-specified timeout may be impractically low */
low_timeout = timeout;
}
timeout -= check;
}
if (timeout) {
dev_warn(&syncpt_to_dev(sp)->pdev->dev,
"%s: syncpoint id %d (%s) stuck waiting %d, timeout=%d\n",
current->comm, id, syncpt_op(sp).name(sp, id),
thresh, timeout);
syncpt_op(sp).debug(sp);
print_once++;
if (print_once == 1)
{
nvhost_debug_dump(syncpt_to_dev(sp));
debug_stuck_syncpoint();
}
if (check_count > MAX_STUCK_CHECK_COUNT) {
if (low_timeout) {
dev_warn(&syncpt_to_dev(sp)->pdev->dev,
"is timeout %d too low?\n",
low_timeout);
}
nvhost_debug_dump(syncpt_to_dev(sp));
BUG();
}
check_count++;
}
}
nvhost_intr_put_ref(&(syncpt_to_dev(sp)->intr), ref);
done:
nvhost_module_idle(syncpt_to_dev(sp)->dev);
return err;
}
/**
* Main entrypoint for syncpoint value waits.
*/
int nvhost_syncpt_wait_timeout(struct nvhost_syncpt *sp, u32 id,
u32 thresh, u32 timeout)
{
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
void *ref;
int err = 0;
//struct nvhost_dev *dev = syncpt_to_dev(sp);
BUG_ON(!check_max(sp, id, thresh));
/* first check cache */
if (nvhost_syncpt_min_cmp(sp, id, thresh))
return 0;
/* keep host alive */
nvhost_module_busy(&syncpt_to_dev(sp)->mod);
if (client_managed(id) || !nvhost_syncpt_min_eq_max(sp, id)) {
/* try to read from register */
u32 val = nvhost_syncpt_update_min(sp, id);
if ((s32)(val - thresh) >= 0)
goto done;
}
if (!timeout) {
err = -EAGAIN;
goto done;
}
/* schedule a wakeup when the syncpoint value is reached */
err = nvhost_intr_add_action(&(syncpt_to_dev(sp)->intr), id, thresh,
NVHOST_INTR_ACTION_WAKEUP_INTERRUPTIBLE, &wq, &ref);
if (err)
goto done;
/* wait for the syncpoint, or timeout, or signal */
while (timeout) {
u32 check = min_t(u32, SYNCPT_CHECK_PERIOD, timeout);
err = wait_event_interruptible_timeout(wq,
nvhost_syncpt_min_cmp(sp, id, thresh),
check);
if (err != 0)
break;
if (timeout != NVHOST_NO_TIMEOUT)
timeout -= SYNCPT_CHECK_PERIOD;
if (timeout) {
dev_warn(&syncpt_to_dev(sp)->pdev->dev,
"syncpoint id %d (%s) stuck waiting %d timeout=%d\n",
id, nvhost_syncpt_name(id), thresh, timeout);
/* A wait queue in nvhost driver maybe run frequently
when early suspend/late resume. These log will be
printed,then the early suspend/late resume
maybe blocked,then it will triger early suspend/late
resume watchdog. Now we cancel these log. */
/*
nvhost_syncpt_debug(sp);
nvhost_channel_fifo_debug(dev);
nvhost_sync_reg_dump(dev);
*/
}
};
if (err > 0)
err = 0;
else if (err == 0)
err = -EAGAIN;
nvhost_intr_put_ref(&(syncpt_to_dev(sp)->intr), ref);
done:
nvhost_module_idle(&syncpt_to_dev(sp)->mod);
return err;
}
