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From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
	linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Carsten Emde <C.Emde@osadl.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	John Kacur <jkacur@redhat.com>,
	Paul Gortmaker <paul.gortmaker@windriver.com>,
	Mike Galbraith <umgwanakikbuti@gmail.com>
Subject: [PATCH RT 17/22] drm,i915: Use local_lock/unlock_irq() in intel_pipe_update_start/end()
Date: Wed, 02 Mar 2016 10:09:16 -0500	[thread overview]
Message-ID: <20160302151113.069303046@goodmis.org> (raw)
In-Reply-To: 20160302150859.204542604@goodmis.org

[-- Attachment #1: 0017-drm-i915-Use-local_lock-unlock_irq-in-intel_pipe_upd.patch --]
[-- Type: text/plain, Size: 5633 bytes --]

4.1.15-rt18-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Mike Galbraith <umgwanakikbuti@gmail.com>

[    8.014039] BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:918
[    8.014041] in_atomic(): 0, irqs_disabled(): 1, pid: 78, name: kworker/u4:4
[    8.014045] CPU: 1 PID: 78 Comm: kworker/u4:4 Not tainted 4.1.7-rt7 #5
[    8.014055] Workqueue: events_unbound async_run_entry_fn
[    8.014059]  0000000000000000 ffff880037153748 ffffffff815f32c9 0000000000000002
[    8.014063]  ffff88013a50e380 ffff880037153768 ffffffff815ef075 ffff8800372c06c8
[    8.014066]  ffff8800372c06c8 ffff880037153778 ffffffff8107c0b3 ffff880037153798
[    8.014067] Call Trace:
[    8.014074]  [<ffffffff815f32c9>] dump_stack+0x4a/0x61
[    8.014078]  [<ffffffff815ef075>] ___might_sleep.part.93+0xe9/0xee
[    8.014082]  [<ffffffff8107c0b3>] ___might_sleep+0x53/0x80
[    8.014086]  [<ffffffff815f9064>] rt_spin_lock+0x24/0x50
[    8.014090]  [<ffffffff8109368b>] prepare_to_wait+0x2b/0xa0
[    8.014152]  [<ffffffffa016c04c>] intel_pipe_update_start+0x17c/0x300 [i915]
[    8.014156]  [<ffffffff81093b40>] ? prepare_to_wait_event+0x120/0x120
[    8.014201]  [<ffffffffa0158f36>] intel_begin_crtc_commit+0x166/0x1e0 [i915]
[    8.014215]  [<ffffffffa00c806d>] drm_atomic_helper_commit_planes+0x5d/0x1a0 [drm_kms_helper]
[    8.014260]  [<ffffffffa0171e9b>] intel_atomic_commit+0xab/0xf0 [i915]
[    8.014288]  [<ffffffffa00654c7>] drm_atomic_commit+0x37/0x60 [drm]
[    8.014298]  [<ffffffffa00c6fcd>] drm_atomic_helper_plane_set_property+0x8d/0xd0 [drm_kms_helper]
[    8.014301]  [<ffffffff815f77d9>] ? __ww_mutex_lock+0x39/0x40
[    8.014319]  [<ffffffffa0053b3d>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm]
[    8.014328]  [<ffffffffa00c8edb>] restore_fbdev_mode+0x6b/0xf0 [drm_kms_helper]
[    8.014337]  [<ffffffffa00cae49>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[    8.014346]  [<ffffffffa00caec2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper]
[    8.014390]  [<ffffffffa016dfba>] intel_fbdev_set_par+0x1a/0x60 [i915]
[    8.014394]  [<ffffffff81327dc4>] fbcon_init+0x4f4/0x580
[    8.014398]  [<ffffffff8139ef4c>] visual_init+0xbc/0x120
[    8.014401]  [<ffffffff813a1623>] do_bind_con_driver+0x163/0x330
[    8.014405]  [<ffffffff813a1b2c>] do_take_over_console+0x11c/0x1c0
[    8.014408]  [<ffffffff813236e3>] do_fbcon_takeover+0x63/0xd0
[    8.014410]  [<ffffffff81328965>] fbcon_event_notify+0x785/0x8d0
[    8.014413]  [<ffffffff8107c12d>] ? __might_sleep+0x4d/0x90
[    8.014416]  [<ffffffff810775fe>] notifier_call_chain+0x4e/0x80
[    8.014419]  [<ffffffff810779cd>] __blocking_notifier_call_chain+0x4d/0x70
[    8.014422]  [<ffffffff81077a06>] blocking_notifier_call_chain+0x16/0x20
[    8.014425]  [<ffffffff8132b48b>] fb_notifier_call_chain+0x1b/0x20
[    8.014428]  [<ffffffff8132d8fa>] register_framebuffer+0x21a/0x350
[    8.014439]  [<ffffffffa00cb164>] drm_fb_helper_initial_config+0x274/0x3e0 [drm_kms_helper]
[    8.014483]  [<ffffffffa016f1cb>] intel_fbdev_initial_config+0x1b/0x20 [i915]
[    8.014486]  [<ffffffff8107912c>] async_run_entry_fn+0x4c/0x160
[    8.014490]  [<ffffffff81070ffa>] process_one_work+0x14a/0x470
[    8.014493]  [<ffffffff81071489>] worker_thread+0x169/0x4c0
[    8.014496]  [<ffffffff81071320>] ? process_one_work+0x470/0x470
[    8.014499]  [<ffffffff81076606>] kthread+0xc6/0xe0
[    8.014502]  [<ffffffff81070000>] ? queue_work_on+0x80/0x110
[    8.014506]  [<ffffffff81076540>] ? kthread_worker_fn+0x1c0/0x1c0

Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 drivers/gpu/drm/i915/intel_sprite.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index a4c0a04b5044..6da459fe20b2 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -37,6 +37,7 @@
 #include "intel_drv.h"
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
+#include <linux/locallock.h>
 
 static bool
 format_is_yuv(uint32_t format)
@@ -61,6 +62,8 @@ static int usecs_to_scanlines(const struct drm_display_mode *mode, int usecs)
 	return DIV_ROUND_UP(usecs * mode->crtc_clock, 1000 * mode->crtc_htotal);
 }
 
+static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock);
+
 /**
  * intel_pipe_update_start() - start update of a set of display registers
  * @crtc: the crtc of which the registers are going to be updated
@@ -101,7 +104,7 @@ bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
 	if (WARN_ON(drm_crtc_vblank_get(&crtc->base)))
 		return false;
 
-	local_irq_disable();
+	local_lock_irq(pipe_update_lock);
 
 	trace_i915_pipe_update_start(crtc, min, max);
 
@@ -123,11 +126,11 @@ bool intel_pipe_update_start(struct intel_crtc *crtc, uint32_t *start_vbl_count)
 			break;
 		}
 
-		local_irq_enable();
+		local_unlock_irq(pipe_update_lock);
 
 		timeout = schedule_timeout(timeout);
 
-		local_irq_disable();
+		local_lock_irq(pipe_update_lock);
 	}
 
 	finish_wait(wq, &wait);
@@ -158,7 +161,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc, u32 start_vbl_count)
 
 	trace_i915_pipe_update_end(crtc, end_vbl_count);
 
-	local_irq_enable();
+	local_unlock_irq(pipe_update_lock);
 
 	if (start_vbl_count != end_vbl_count)
 		DRM_ERROR("Atomic update failure on pipe %c (start=%u end=%u)\n",
-- 
2.7.0

  parent reply	other threads:[~2016-03-02 15:09 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-02 15:08 [PATCH RT 00/22] Linux 4.1.15-rt18-rc1 Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 01/22] sched: reset tasks lockless wake-queues on fork() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 02/22] ptrace: dont open IRQs in ptrace_freeze_traced() too early Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 03/22] net: move xmit_recursion to per-task variable on -RT Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 04/22] kernel/softirq: use cond_resched_rcu_qs() on -RT as well (run_ksoftirqd()) Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 05/22] net/core: protect users of napi_alloc_cache against reentrance Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 06/22] preempt-lazy: Add the lazy-preemption check to preempt_schedule() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 07/22] softirq: split timer softirqs out of ksoftirqd Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 08/22] net: provide a way to delegate processing a softirq to ksoftirqd Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 09/22] latencyhist: disable jump-labels Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 10/22] arm64: replace read_lock to rcu lock in call_step_hook Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 11/22] kernel: migrate_disable() do fastpath in atomic & irqs-off Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 12/22] kernel: softirq: unlock with irqs on Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 13/22] kernel/stop_machine: partly revert "stop_machine: Use raw spinlocks" Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 14/22] tick/broadcast: Make broadcast hrtimer irqsafe Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 15/22] sched,rt: __always_inline preemptible_lazy() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 16/22] drm,radeon,i915: Use preempt_disable/enable_rt() where recommended Steven Rostedt
2016-03-02 15:09 ` Steven Rostedt [this message]
2016-03-02 15:09 ` [PATCH RT 18/22] trace: Use rcuidle version for preemptoff_hist trace point Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 19/22] f2fs: Mutex cant be used by down_write_nest_lock() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 20/22] rcu/torture: Comment out rcu_bh ops on PREEMPT_RT_FULL Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 21/22] kernel: sched: Fix preempt_disable_ip recodring for preempt_disable() Steven Rostedt
2016-03-02 15:09 ` [PATCH RT 22/22] Linux 4.1.15-rt18-rc1 Steven Rostedt

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