[ANNOUNCE] 3.18.9-rt5

From: Sebastian Andrzej Siewior
Date: Mon Mar 16 2015 - 17:01:59 EST

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Dear RT folks!

I'm pleased to announce the v3.18.9-rt5 patch set.

Changes since v3.18.9-rt4

- fix non-rt builds. Reported by Neil Bradley, fixed by Steven Rostedt

- backport a patch from Lai Jiangshan which was suggested by Paul E.
McKenney to avoid a RCU related race

- a bunch of stable marked patches for the radeon driver to avoid a
freeze of the machine during heavy GPU usage. It was reported by
Carsten Emde and he says that the machine does no longer lockup with
them but X seems still to hang.

- a patch from Mike Galbraith to get FULL_NOHZ to work again. The patch
("rt-nohz_full-fix-nohz_full-for-PREEMPT_RT_FULL.patch") is included
in the split out queue but is currently not enabled.

- lazy preempt on x86_64 is enabled again. It seems that it fixed
itself.

Known issues:

- bcache is disabled.

- CPU hotplug works in general. Steven's test script however
deadlocks usually on the second invocation.

- xor / raid_pq
I had max latency jumping up to 67563us on one CPU while the next
lower max was 58us. I tracked it down to module's init code of
xor and raid_pq. Both disable preemption while measuring the
measuring the performance of the individual implementation.

The delta patch against 3.18.9-rt4 is appended below and can be found here:

https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/incr/patch-3.18.9-rt4-rt5.patch.xz

The RT patch against 3.18.9 can be found here:

https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patch-3.18.9-rt5.patch.xz

The split quilt queue is available at:

https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patches-3.18.9-rt5.tar.xz

Sebastian

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5c4f25b843d9..25d692ddae4e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -21,7 +21,7 @@ config X86_64
### Arch settings
config X86
def_bool y
- select HAVE_PREEMPT_LAZY if X86_32
+ select HAVE_PREEMPT_LAZY
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
select ARCH_HAS_FAST_MULTIPLIER
diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
index 9328fb3dcfce..36a6bce74230 100644
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c
@@ -7295,7 +7295,6 @@ int cik_irq_set(struct radeon_device *rdev)
u32 hpd1, hpd2, hpd3, hpd4, hpd5, hpd6;
u32 grbm_int_cntl = 0;
u32 dma_cntl, dma_cntl1;
- u32 thermal_int;

if (!rdev->irq.installed) {
WARN(1, "Can't enable IRQ/MSI because no handler is installed\n");
@@ -7332,13 +7331,6 @@ int cik_irq_set(struct radeon_device *rdev)
cp_m2p2 = RREG32(CP_ME2_PIPE2_INT_CNTL) & ~TIME_STAMP_INT_ENABLE;
cp_m2p3 = RREG32(CP_ME2_PIPE3_INT_CNTL) & ~TIME_STAMP_INT_ENABLE;

- if (rdev->flags & RADEON_IS_IGP)
- thermal_int = RREG32_SMC(CG_THERMAL_INT_CTRL) &
- ~(THERM_INTH_MASK | THERM_INTL_MASK);
- else
- thermal_int = RREG32_SMC(CG_THERMAL_INT) &
- ~(THERM_INT_MASK_HIGH | THERM_INT_MASK_LOW);
-
/* enable CP interrupts on all rings */
if (atomic_read(&rdev->irq.ring_int[RADEON_RING_TYPE_GFX_INDEX])) {
DRM_DEBUG("cik_irq_set: sw int gfx\n");
@@ -7496,14 +7488,6 @@ int cik_irq_set(struct radeon_device *rdev)
hpd6 |= DC_HPDx_INT_EN;
}

- if (rdev->irq.dpm_thermal) {
- DRM_DEBUG("dpm thermal\n");
- if (rdev->flags & RADEON_IS_IGP)
- thermal_int |= THERM_INTH_MASK | THERM_INTL_MASK;
- else
- thermal_int |= THERM_INT_MASK_HIGH | THERM_INT_MASK_LOW;
- }
-
WREG32(CP_INT_CNTL_RING0, cp_int_cntl);

WREG32(SDMA0_CNTL + SDMA0_REGISTER_OFFSET, dma_cntl);
@@ -7557,10 +7541,8 @@ int cik_irq_set(struct radeon_device *rdev)
WREG32(DC_HPD5_INT_CONTROL, hpd5);
WREG32(DC_HPD6_INT_CONTROL, hpd6);

- if (rdev->flags & RADEON_IS_IGP)
- WREG32_SMC(CG_THERMAL_INT_CTRL, thermal_int);
- else
- WREG32_SMC(CG_THERMAL_INT, thermal_int);
+ /* posting read */
+ RREG32(SRBM_STATUS);

return 0;
}
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 85995b4e3338..c674f63d7f14 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -4589,6 +4589,9 @@ int evergreen_irq_set(struct radeon_device *rdev)
WREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET, afmt5);
WREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET, afmt6);

+ /* posting read */
+ RREG32(SRBM_STATUS);
+
return 0;
}

diff --git a/drivers/gpu/drm/radeon/kv_dpm.c b/drivers/gpu/drm/radeon/kv_dpm.c
index e3e9c10cfba9..85a109e1e56b 100644
--- a/drivers/gpu/drm/radeon/kv_dpm.c
+++ b/drivers/gpu/drm/radeon/kv_dpm.c
@@ -1169,6 +1169,19 @@ void kv_dpm_enable_bapm(struct radeon_device *rdev, bool enable)
}
}

+static void kv_enable_thermal_int(struct radeon_device *rdev, bool enable)
+{
+ u32 thermal_int;
+
+ thermal_int = RREG32_SMC(CG_THERMAL_INT_CTRL);
+ if (enable)
+ thermal_int |= THERM_INTH_MASK | THERM_INTL_MASK;
+ else
+ thermal_int &= ~(THERM_INTH_MASK | THERM_INTL_MASK);
+ WREG32_SMC(CG_THERMAL_INT_CTRL, thermal_int);
+
+}
+
int kv_dpm_enable(struct radeon_device *rdev)
{
struct kv_power_info *pi = kv_get_pi(rdev);
@@ -1280,8 +1293,7 @@ int kv_dpm_late_enable(struct radeon_device *rdev)
DRM_ERROR("kv_set_thermal_temperature_range failed\n");
return ret;
}
- rdev->irq.dpm_thermal = true;
- radeon_irq_set(rdev);
+ kv_enable_thermal_int(rdev, true);
}

/* powerdown unused blocks for now */
@@ -1312,6 +1324,7 @@ void kv_dpm_disable(struct radeon_device *rdev)
kv_stop_dpm(rdev);
kv_enable_ulv(rdev, false);
kv_reset_am(rdev);
+ kv_enable_thermal_int(rdev, false);

kv_update_current_ps(rdev, rdev->pm.dpm.boot_ps);
}
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 56b02927cd3d..ee0868dec2f4 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -3787,6 +3787,9 @@ int r600_irq_set(struct radeon_device *rdev)
WREG32(RV770_CG_THERMAL_INT, thermal_int);
}

+ /* posting read */
+ RREG32(R_000E50_SRBM_STATUS);
+
return 0;
}

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index 995167025282..8569afaba688 100644
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -1029,37 +1029,59 @@ static inline bool radeon_test_signaled(struct radeon_fence *fence)
return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);
}

+struct radeon_wait_cb {
+ struct fence_cb base;
+ struct task_struct *task;
+};
+
+static void
+radeon_fence_wait_cb(struct fence *fence, struct fence_cb *cb)
+{
+ struct radeon_wait_cb *wait =
+ container_of(cb, struct radeon_wait_cb, base);
+
+ wake_up_process(wait->task);
+}
+
static signed long radeon_fence_default_wait(struct fence *f, bool intr,
signed long t)
{
struct radeon_fence *fence = to_radeon_fence(f);
struct radeon_device *rdev = fence->rdev;
- bool signaled;
+ struct radeon_wait_cb cb;

- fence_enable_sw_signaling(&fence->base);
+ cb.task = current;

- /*
- * This function has to return -EDEADLK, but cannot hold
- * exclusive_lock during the wait because some callers
- * may already hold it. This means checking needs_reset without
- * lock, and not fiddling with any gpu internals.
- *
- * The callback installed with fence_enable_sw_signaling will
- * run before our wait_event_*timeout call, so we will see
- * both the signaled fence and the changes to needs_reset.
- */
+ if (fence_add_callback(f, &cb.base, radeon_fence_wait_cb))
+ return t;
+
+ while (t > 0) {
+ if (intr)
+ set_current_state(TASK_INTERRUPTIBLE);
+ else
+ set_current_state(TASK_UNINTERRUPTIBLE);
+
+ /*
+ * radeon_test_signaled must be called after
+ * set_current_state to prevent a race with wake_up_process
+ */
+ if (radeon_test_signaled(fence))
+ break;
+
+ if (rdev->needs_reset) {
+ t = -EDEADLK;
+ break;
+ }
+
+ t = schedule_timeout(t);
+
+ if (t > 0 && intr && signal_pending(current))
+ t = -ERESTARTSYS;
+ }
+
+ __set_current_state(TASK_RUNNING);
+ fence_remove_callback(f, &cb.base);

- if (intr)
- t = wait_event_interruptible_timeout(rdev->fence_queue,
- ((signaled = radeon_test_signaled(fence)) ||
- rdev->needs_reset), t);
- else
- t = wait_event_timeout(rdev->fence_queue,
- ((signaled = radeon_test_signaled(fence)) ||
- rdev->needs_reset), t);
-
- if (t > 0 && !signaled)
- return -EDEADLK;
return t;
}

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 74bce91aecc1..039660662ee8 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -693,6 +693,10 @@ int rs600_irq_set(struct radeon_device *rdev)
WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, hpd2);
if (ASIC_IS_DCE2(rdev))
WREG32(R_007408_HDMI0_AUDIO_PACKET_CONTROL, hdmi0);
+
+ /* posting read */
+ RREG32(R_000040_GEN_INT_CNTL);
+
return 0;
}

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index 7d5083dc4acb..35ce05c78c4d 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -6192,6 +6192,9 @@ int si_irq_set(struct radeon_device *rdev)

WREG32(CG_THERMAL_INT, thermal_int);

+ /* posting read */
+ RREG32(SRBM_STATUS);
+
return 0;
}

diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 0c6491228b17..4b53470bf97b 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -147,7 +147,9 @@ bool irq_work_needs_cpu(void)

if (llist_empty(raised))
if (llist_empty(lazy))
+#ifdef CONFIG_PREEMPT_RT_FULL
if (llist_empty(this_cpu_ptr(&hirq_work_list)))
+#endif
return false;

/* All work should have been flushed before going offline */
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 4245a2dc1911..e8508b4febc5 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -173,11 +173,6 @@ struct rcu_node {
/* queued on this rcu_node structure that */
/* are blocking the current grace period, */
/* there can be no such task. */
- struct completion boost_completion;
- /* Used to ensure that the rt_mutex used */
- /* to carry out the boosting is fully */
- /* released with no future boostee accesses */
- /* before that rt_mutex is re-initialized. */
struct rt_mutex boost_mtx;
/* Used only for the priority-boosting */
/* side effect, not as a lock. */
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index e19cfc0a881a..ecd967ecc7ce 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -392,10 +392,8 @@ void rcu_read_unlock_special(struct task_struct *t)

#ifdef CONFIG_RCU_BOOST
/* Unboost if we were boosted. */
- if (drop_boost_mutex) {
+ if (drop_boost_mutex)
rt_mutex_unlock(&rnp->boost_mtx);
- complete(&rnp->boost_completion);
- }
#endif /* #ifdef CONFIG_RCU_BOOST */

/*
@@ -1163,15 +1161,11 @@ static int rcu_boost(struct rcu_node *rnp)
*/
t = container_of(tb, struct task_struct, rcu_node_entry);
rt_mutex_init_proxy_locked(&rnp->boost_mtx, t);
- init_completion(&rnp->boost_completion);
raw_spin_unlock_irqrestore(&rnp->lock, flags);
/* Lock only for side effect: boosts task t's priority. */
rt_mutex_lock(&rnp->boost_mtx);
rt_mutex_unlock(&rnp->boost_mtx); /* Then keep lockdep happy. */

- /* Wait for boostee to be done w/boost_mtx before reinitializing. */
- wait_for_completion(&rnp->boost_completion);
-
return ACCESS_ONCE(rnp->exp_tasks) != NULL ||
ACCESS_ONCE(rnp->boost_tasks) != NULL;
}
diff --git a/localversion-rt b/localversion-rt
index ad3da1bcab7e..0efe7ba1930e 100644
--- a/localversion-rt
+++ b/localversion-rt
@@ -1 +1 @@
--rt4
+-rt5
--
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