2020-06-23 13:42:59 +00:00
|
|
|
From 87a5e8b4b0f251c4d0a8a67b82198016c1b6ca54 Mon Sep 17 00:00:00 2001
|
|
|
|
Message-Id: <87a5e8b4b0f251c4d0a8a67b82198016c1b6ca54.1592846147.git.zanussi@kernel.org>
|
|
|
|
In-Reply-To: <07cd0dbc80b976663c80755496a03f288decfe5a.1592846146.git.zanussi@kernel.org>
|
|
|
|
References: <07cd0dbc80b976663c80755496a03f288decfe5a.1592846146.git.zanussi@kernel.org>
|
2018-12-14 09:55:05 +00:00
|
|
|
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
|
|
Date: Thu, 6 Dec 2018 09:52:20 +0100
|
2020-06-23 13:42:59 +00:00
|
|
|
Subject: [PATCH 254/330] drm/i915: disable tracing on -RT
|
|
|
|
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.127-rt55.tar.xz
|
2018-12-14 09:55:05 +00:00
|
|
|
|
|
|
|
Luca Abeni reported this:
|
|
|
|
| BUG: scheduling while atomic: kworker/u8:2/15203/0x00000003
|
|
|
|
| CPU: 1 PID: 15203 Comm: kworker/u8:2 Not tainted 4.19.1-rt3 #10
|
|
|
|
| Call Trace:
|
|
|
|
| rt_spin_lock+0x3f/0x50
|
|
|
|
| gen6_read32+0x45/0x1d0 [i915]
|
|
|
|
| g4x_get_vblank_counter+0x36/0x40 [i915]
|
|
|
|
| trace_event_raw_event_i915_pipe_update_start+0x7d/0xf0 [i915]
|
|
|
|
|
|
|
|
The tracing events use trace_i915_pipe_update_start() among other events
|
|
|
|
use functions acquire spin locks. A few trace points use
|
|
|
|
intel_get_crtc_scanline(), others use ->get_vblank_counter() wich also
|
|
|
|
might acquire a sleeping lock.
|
|
|
|
|
|
|
|
Based on this I don't see any other way than disable trace points on RT.
|
|
|
|
|
|
|
|
Cc: stable-rt@vger.kernel.org
|
|
|
|
Reported-by: Luca Abeni <lucabe72@gmail.com>
|
|
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
|
|
---
|
2019-04-08 23:49:20 +00:00
|
|
|
drivers/gpu/drm/i915/i915_trace.h | 4 ++++
|
2018-12-14 09:55:05 +00:00
|
|
|
1 file changed, 4 insertions(+)
|
|
|
|
|
2019-04-08 23:49:20 +00:00
|
|
|
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
|
|
|
|
index b50c6b829715..cc54ec0ef75c 100644
|
2018-12-14 09:55:05 +00:00
|
|
|
--- a/drivers/gpu/drm/i915/i915_trace.h
|
|
|
|
+++ b/drivers/gpu/drm/i915/i915_trace.h
|
|
|
|
@@ -2,6 +2,10 @@
|
|
|
|
#if !defined(_I915_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
|
|
|
|
#define _I915_TRACE_H_
|
|
|
|
|
|
|
|
+#ifdef CONFIG_PREEMPT_RT_BASE
|
|
|
|
+#define NOTRACE
|
|
|
|
+#endif
|
|
|
|
+
|
|
|
|
#include <linux/stringify.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <linux/tracepoint.h>
|
2020-01-03 23:36:11 +00:00
|
|
|
--
|
2020-06-22 13:14:16 +00:00
|
|
|
2.17.1
|
2020-01-03 23:36:11 +00:00
|
|
|
|