/** * Updates the last value read from hardware. * (was nvhost_syncpt_update_min) */ static u32 t20_syncpt_update_min(struct nvhost_syncpt *sp, u32 id) { struct nvhost_master *dev = syncpt_to_dev(sp); void __iomem *sync_regs = dev->sync_aperture; u32 old, live; do { old = nvhost_syncpt_read_min(sp, id); live = readl(sync_regs + (HOST1X_SYNC_SYNCPT_0 + id * 4)); } while ((u32)atomic_cmpxchg(&sp->min_val[id], old, live) != old); if (!nvhost_syncpt_check_max(sp, id, live)) dev_err(&syncpt_to_dev(sp)->dev->dev, "%s failed: id=%u, min=%d, max=%d\n", __func__, nvhost_syncpt_read_min(sp, id), nvhost_syncpt_read_max(sp, id), id); return live; }
/** * 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; }