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Commit f56388f3 authored by Erik Gilling's avatar Erik Gilling Committed by Greg Kroah-Hartman
Browse files

staging: sync: Dump sync state to console on timeout 



If we hit a timeout, dump sync state to console

Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: default avatarErik Gilling <konkers@android.com>
[jstultz: Add commit message, whitespace fixups]
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3b640f5d

drivers/staging/android/sync.c

+32 −2
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
static void sync_fence_signal_pt(struct sync_pt *pt);

static int _sync_pt_has_signaled(struct sync_pt *pt);

static void sync_fence_free(struct kref *kref);

static void sync_dump(void);



static LIST_HEAD(sync_timeline_list_head);

static DEFINE_SPINLOCK(sync_timeline_list_lock);
@@ -574,8 +575,10 @@ int sync_fence_wait(struct sync_fence *fence, long timeout) 
	if (fence->status < 0)

		return fence->status;



	if (fence->status == 0)

	if (fence->status == 0) {

		sync_dump();

		return -ETIME;

	}



	return 0;

}
@@ -914,7 +917,34 @@ static __init int sync_debugfs_init(void) 
	debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);

	return 0;

}



late_initcall(sync_debugfs_init);



#define DUMP_CHUNK 256

static char sync_dump_buf[64 * 1024];

void sync_dump(void)

{

	struct seq_file s = {

		.buf = sync_dump_buf,

		.size = sizeof(sync_dump_buf) - 1,

	};

	int i;



	sync_debugfs_show(&s, NULL);



	for (i = 0; i < s.count; i += DUMP_CHUNK) {

		if ((s.count - i) > DUMP_CHUNK) {

			char c = s.buf[i + DUMP_CHUNK];

			s.buf[i + DUMP_CHUNK] = 0;

			pr_cont("%s", s.buf + i);

			s.buf[i + DUMP_CHUNK] = c;

		} else {

			s.buf[s.count] = 0;

			pr_cont("%s", s.buf + i);

		}

	}

}

#else

static void sync_dump(void)

{

}

#endif