1 files changed, 130 insertions, 0 deletions
diff --git a/driver/product/kernel/drivers/gpu/arm/midgard/mali_kbase_regs_history_debugfs.c b/driver/product/kernel/drivers/gpu/arm/midgard/mali_kbase_regs_history_debugfs.c
new file mode 100755
index 0000000..c970650
--- /dev/null
+++ b/driver/product/kernel/drivers/gpu/arm/midgard/mali_kbase_regs_history_debugfs.c
@@ -0,0 +1,130 @@
+/*
+ *
+ * (C) COPYRIGHT 2016 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * A copy of the licence is included with the program, and can also be obtained
+ * from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301, USA.
+ *
+ */
+
+
+
+#include "mali_kbase.h"
+
+#include "mali_kbase_regs_history_debugfs.h"
+
+#if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_MALI_NO_MALI)
+
+#include <linux/debugfs.h>
+
+
+static int regs_history_size_get(void *data, u64 *val)
+{
+	struct kbase_io_history *const h = data;
+
+	*val = h->size;
+
+	return 0;
+}
+
+static int regs_history_size_set(void *data, u64 val)
+{
+	struct kbase_io_history *const h = data;
+
+	return kbase_io_history_resize(h, (u16)val);
+}
+
+
+DEFINE_SIMPLE_ATTRIBUTE(regs_history_size_fops,
+		regs_history_size_get,
+		regs_history_size_set,
+		"%llu\n");
+
+
+/**
+ * regs_history_show - show callback for the register access history file.
+ *
+ * @sfile: The debugfs entry
+ * @data: Data associated with the entry
+ *
+ * This function is called to dump all recent accesses to the GPU registers.
+ *
+ * @return 0 if successfully prints data in debugfs entry file, failure
+ * otherwise
+ */
+static int regs_history_show(struct seq_file *sfile, void *data)
+{
+	struct kbase_io_history *const h = sfile->private;
+	u16 i;
+	size_t iters;
+	unsigned long flags;
+
+	if (!h->enabled) {
+		seq_puts(sfile, "The register access history is disabled\n");
+		goto out;
+	}
+
+	spin_lock_irqsave(&h->lock, flags);
+
+	iters = (h->size > h->count) ? h->count : h->size;
+	seq_printf(sfile, "Last %zu register accesses of %zu total:\n", iters,
+			h->count);
+	for (i = 0; i < iters; ++i) {
+		struct kbase_io_access *io =
+			&h->buf[(h->count - iters + i) % h->size];
+		char const access = (io->addr & 1) ? 'w' : 'r';
+
+		seq_printf(sfile, "%6i: %c: reg 0x%p val %08x\n", i, access,
+				(void *)(io->addr & ~0x1), io->value);
+	}
+
+	spin_unlock_irqrestore(&h->lock, flags);
+
+out:
+	return 0;
+}
+
+
+/**
+ * regs_history_open - open operation for regs_history debugfs file
+ *
+ * @in: &struct inode pointer
+ * @file: &struct file pointer
+ *
+ * @return file descriptor
+ */
+static int regs_history_open(struct inode *in, struct file *file)
+{
+	return single_open(file, &regs_history_show, in->i_private);
+}
+
+
+static const struct file_operations regs_history_fops = {
+	.open = &regs_history_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+
+void kbasep_regs_history_debugfs_init(struct kbase_device *kbdev)
+{
+	debugfs_create_bool("regs_history_enabled", S_IRUGO | S_IWUSR,
+			kbdev->mali_debugfs_directory,
+			&kbdev->io_history.enabled);
+	debugfs_create_file("regs_history_size", S_IRUGO | S_IWUSR,
+			kbdev->mali_debugfs_directory,
+			&kbdev->io_history, &regs_history_size_fops);
+	debugfs_create_file("regs_history", S_IRUGO,
+			kbdev->mali_debugfs_directory, &kbdev->io_history,
+			&regs_history_fops);
+}
+
+
+#endif /* CONFIG_DEBUG_FS */