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

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>
This commit is contained in:
Dmitry Osipenko 2020-06-29 06:18:41 +03:00 committed by Thierry Reding
parent fd323e9ef0
commit 3568186280
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/host1x/debug.c
View File

@ -16,6 +16,8 @@
#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;
@ -52,12 +54,14 @@ 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;