gpu: host1x: Add debug support

Add support for host1x debugging. Adds debugfs entries, and dumps
channel state to UART in case of stuck job.

Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>

1 files changed, 210 insertions, 0 deletions

diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c
new file mode 100644
index 000000000000..3ec7d77de24d
--- /dev/null
+++ b/drivers/gpu/host1x/debug.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2010 Google, Inc.
+ * Author: Erik Gilling <konkers@android.com>
+ *
+ * Copyright (C) 2011-2013 NVIDIA Corporation
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+
+#include <linux/io.h>
+
+#include "dev.h"
+#include "debug.h"
+#include "channel.h"
+
+unsigned int host1x_debug_trace_cmdbuf;
+
+static pid_t host1x_debug_force_timeout_pid;
+static u32 host1x_debug_force_timeout_val;
+static u32 host1x_debug_force_timeout_channel;
+
+void host1x_debug_output(struct output *o, const char *fmt, ...)
+{
+        va_list args;
+        int len;
+
+        va_start(args, fmt);
+        len = vsnprintf(o->buf, sizeof(o->buf), fmt, args);
+        va_end(args);
+        o->fn(o->ctx, o->buf, len);
+}
+
+static int show_channels(struct host1x_channel *ch, void *data, bool show_fifo)
+{
+        struct host1x *m = dev_get_drvdata(ch->dev->parent);
+        struct output *o = data;
+
+        mutex_lock(&ch->reflock);
+        if (ch->refcount) {
+                mutex_lock(&ch->cdma.lock);
+                if (show_fifo)
+                        host1x_hw_show_channel_fifo(m, ch, o);
+                host1x_hw_show_channel_cdma(m, ch, o);
+                mutex_unlock(&ch->cdma.lock);
+        }
+        mutex_unlock(&ch->reflock);
+
+        return 0;
+}
+
+static void show_syncpts(struct host1x *m, struct output *o)
+{
+        int i;
+        host1x_debug_output(o, "---- syncpts ----\n");
+        for (i = 0; i < host1x_syncpt_nb_pts(m); i++) {
+                u32 max = host1x_syncpt_read_max(m->syncpt + i);
+                u32 min = host1x_syncpt_load(m->syncpt + i);
+                if (!min && !max)
+                        continue;
+                host1x_debug_output(o, "id %d (%s) min %d max %d\n",
+                                    i, m->syncpt[i].name, min, max);
+        }
+
+        for (i = 0; i < host1x_syncpt_nb_bases(m); i++) {
+                u32 base_val;
+                base_val = host1x_syncpt_load_wait_base(m->syncpt + i);
+                if (base_val)
+                        host1x_debug_output(o, "waitbase id %d val %d\n", i,
+                                            base_val);
+        }
+
+        host1x_debug_output(o, "\n");
+}
+
+static void show_all(struct host1x *m, struct output *o)
+{
+        struct host1x_channel *ch;
+
+        host1x_hw_show_mlocks(m, o);
+        show_syncpts(m, o);
+        host1x_debug_output(o, "---- channels ----\n");
+
+        host1x_for_each_channel(m, ch)
+                show_channels(ch, o, true);
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void show_all_no_fifo(struct host1x *host1x, struct output *o)
+{
+        struct host1x_channel *ch;
+
+        host1x_hw_show_mlocks(host1x, o);
+        show_syncpts(host1x, o);
+        host1x_debug_output(o, "---- channels ----\n");
+
+        host1x_for_each_channel(host1x, ch)
+                show_channels(ch, o, false);
+}
+
+static int host1x_debug_show_all(struct seq_file *s, void *unused)
+{
+        struct output o = {
+                .fn = write_to_seqfile,
+                .ctx = s
+        };
+        show_all(s->private, &o);
+        return 0;
+}
+
+static int host1x_debug_show(struct seq_file *s, void *unused)
+{
+        struct output o = {
+                .fn = write_to_seqfile,
+                .ctx = s
+        };
+        show_all_no_fifo(s->private, &o);
+        return 0;
+}
+
+static int host1x_debug_open_all(struct inode *inode, struct file *file)
+{
+        return single_open(file, host1x_debug_show_all, inode->i_private);
+}
+
+static const struct file_operations host1x_debug_all_fops = {
+        .open           = host1x_debug_open_all,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int host1x_debug_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, host1x_debug_show, inode->i_private);
+}
+
+static const struct file_operations host1x_debug_fops = {
+        .open           = host1x_debug_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+void host1x_debug_init(struct host1x *host1x)
+{
+        struct dentry *de = debugfs_create_dir("tegra-host1x", NULL);
+
+        if (!de)
+                return;
+
+        /* Store the created entry */
+        host1x->debugfs = de;
+
+        debugfs_create_file("status", S_IRUGO, de, host1x, &host1x_debug_fops);
+        debugfs_create_file("status_all", S_IRUGO, de, host1x,
+                            &host1x_debug_all_fops);
+
+        debugfs_create_u32("trace_cmdbuf", S_IRUGO|S_IWUSR, de,
+                           &host1x_debug_trace_cmdbuf);
+
+        host1x_hw_debug_init(host1x, de);
+
+        debugfs_create_u32("force_timeout_pid", S_IRUGO|S_IWUSR, de,
+                           &host1x_debug_force_timeout_pid);
+        debugfs_create_u32("force_timeout_val", S_IRUGO|S_IWUSR, de,
+                           &host1x_debug_force_timeout_val);
+        debugfs_create_u32("force_timeout_channel", S_IRUGO|S_IWUSR, de,
+                           &host1x_debug_force_timeout_channel);
+}
+
+void host1x_debug_deinit(struct host1x *host1x)
+{
+        debugfs_remove_recursive(host1x->debugfs);
+}
+#else
+void host1x_debug_init(struct host1x *host1x)
+{
+}
+void host1x_debug_deinit(struct host1x *host1x)
+{
+}
+#endif
+
+void host1x_debug_dump(struct host1x *host1x)
+{
+        struct output o = {
+                .fn = write_to_printk
+        };
+        show_all(host1x, &o);
+}
+
+void host1x_debug_dump_syncpts(struct host1x *host1x)
+{
+        struct output o = {
+                .fn = write_to_printk
+        };
+        show_syncpts(host1x, &o);
+}