From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Kuoppala Subject: [PATCH] drm/i915: Fix timeout with missed interrupts in __wait_seqno Date: Mon, 9 Dec 2013 21:11:24 +0200 Message-ID: <1386616284-4306-1-git-send-email-mika.kuoppala@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mga14.intel.com (mga14.intel.com [143.182.124.37]) by gabe.freedesktop.org (Postfix) with ESMTP id 88403FA03D for ; Mon, 9 Dec 2013 23:54:31 -0800 (PST) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: intel-gfx-bounces@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org To: intel-gfx@lists.freedesktop.org Cc: miku@iki.fi List-Id: intel-gfx@lists.freedesktop.org Commit 094f9a54e355 ("drm/i915: Fix __wait_seqno to use true infinite timeouts") added support for __wait_seqno to detect missing interrupts and go around them by polling. As there is also timeout detection in __wait_seqno, the polling and timeout detection were done with the same timer. When there has been missed interrupts and polling is needed, the timer is set to trigger in (now + 1) jiffies in future, instead of the caller specified timeout. Now when io_schedule() returns, we calculate the jiffies left to timeout using the timer expiration value. As the current jiffies is now bound to be always equal or greater than the expiration value, the timeout_jiffies will become zero or negative and we return -ETIME to caller even tho the timeout was never reached. Fix this by decoupling timeout calculation from timer expiration. v2: Commit message with some sense in it (Chris Wilson) Signed-off-by: Mika Kuoppala --- drivers/gpu/drm/i915/i915_gem.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 92149bc..8f6e652 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1017,7 +1017,7 @@ static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno, drm_i915_private_t *dev_priv = ring->dev->dev_private; struct timespec before, now; DEFINE_WAIT(wait); - long timeout_jiffies; + unsigned long timeout_expire; int ret; WARN(dev_priv->pc8.irqs_disabled, "IRQs disabled\n"); @@ -1025,7 +1025,7 @@ static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno, if (i915_seqno_passed(ring->get_seqno(ring, true), seqno)) return 0; - timeout_jiffies = timeout ? timespec_to_jiffies_timeout(timeout) : 1; + timeout_expire = jiffies + timeout ? timespec_to_jiffies_timeout(timeout) : 1; if (dev_priv->info->gen >= 6 && can_wait_boost(file_priv)) { gen6_rps_boost(dev_priv); @@ -1044,7 +1044,6 @@ static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno, getrawmonotonic(&before); for (;;) { struct timer_list timer; - unsigned long expire; prepare_to_wait(&ring->irq_queue, &wait, interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE); @@ -1070,23 +1069,22 @@ static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno, break; } - if (timeout_jiffies <= 0) { + if (timeout && time_after_eq(jiffies, timeout_expire)) { ret = -ETIME; break; } timer.function = NULL; if (timeout || missed_irq(dev_priv, ring)) { + unsigned long expire; + setup_timer_on_stack(&timer, fake_irq, (unsigned long)current); - expire = jiffies + (missed_irq(dev_priv, ring) ? 1: timeout_jiffies); + expire = missed_irq(dev_priv, ring) ? jiffies + 1 : timeout_expire; mod_timer(&timer, expire); } io_schedule(); - if (timeout) - timeout_jiffies = expire - jiffies; - if (timer.function) { del_singleshot_timer_sync(&timer); destroy_timer_on_stack(&timer); -- 1.7.9.5