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gpu: host1x: debug: Fix multiple channels emitting messages simultaneously

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[ Upstream commit 3568186280 ]

Once channel's job is hung, it dumps the channel's state into KMSG before
tearing down the offending job. If multiple channels hang at once, then
they dump messages simultaneously, making the debug info unreadable, and
thus, useless. This patch adds mutex which allows only one channel to emit
debug messages at a time.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Osipenko
2020-06-29 06:18:41 +03:00
committed by Greg Kroah-Hartman
parent b1b3ee664a
commit e68ee83f8b
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/host1x/debug.c
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@@ -25,6 +25,8 @@
#include "debug.h"
#include "channel.h"
static DEFINE_MUTEX(debug_lock);
unsigned int host1x_debug_trace_cmdbuf;
static pid_t host1x_debug_force_timeout_pid;
@@ -61,12 +63,14 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
struct output *o = data;
mutex_lock(&ch->cdma.lock);
mutex_lock(&debug_lock);
if (show_fifo)
host1x_hw_show_channel_fifo(m, ch, o);
host1x_hw_show_channel_cdma(m, ch, o);
mutex_unlock(&debug_lock);
mutex_unlock(&ch->cdma.lock);
return 0;