soc: qcom: Add snapshot of SMEM driver

This snapshot is taken as of msm-3.18 commit e70ad0cd (Promotion of
kernel.lnx.3.18-151201)

Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>

1 files changed, 139 insertions, 0 deletions

diff --git a/drivers/soc/qcom/smem_debug.c b/drivers/soc/qcom/smem_debug.c
new file mode 100644
index 000000000000..ace89afb614c
--- /dev/null
+++ b/drivers/soc/qcom/smem_debug.c
@@ -0,0 +1,139 @@
+/* arch/arm/mach-msm/smem_debug.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2009-2013, The Linux Foundation. All rights reserved.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * 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/list.h>
+#include <linux/ctype.h>
+#include <linux/jiffies.h>
+
+#include <soc/qcom/smem.h>
+
+#include "smem_private.h"
+
+#if defined(CONFIG_DEBUG_FS)
+
+#define SZ_SMEM_ALLOCATION_TABLE 8192
+
+static void debug_read_mem(struct seq_file *s)
+{
+	unsigned n;
+	struct smem_heap_info *heap_info;
+	struct smem_heap_entry *toc;
+
+	heap_info = smem_find(SMEM_HEAP_INFO, sizeof(struct smem_heap_info),
+						0,
+						SMEM_ANY_HOST_FLAG);
+	if (!heap_info) {
+		seq_puts(s, "SMEM_HEAP_INFO is NULL\n");
+		return;
+	}
+	toc = smem_find(SMEM_ALLOCATION_TABLE, SZ_SMEM_ALLOCATION_TABLE,
+							0, SMEM_ANY_HOST_FLAG);
+	if (!toc) {
+		seq_puts(s, "SMEM_ALLOCATION_TABLE is NULL\n");
+		return;
+	}
+
+	seq_printf(s, "heap: init=%d free=%d remain=%d\n",
+		       heap_info->initialized,
+		       heap_info->free_offset,
+		       heap_info->heap_remaining);
+
+	for (n = 0; n < SMEM_NUM_ITEMS; n++) {
+		if (toc[n].allocated == 0)
+			continue;
+		seq_printf(s, "%04d: offset %08x size %08x\n",
+			       n, toc[n].offset, toc[n].size);
+	}
+}
+
+static void debug_read_smem_version(struct seq_file *s)
+{
+	uint32_t n, version;
+
+	for (n = 0; n < 32; n++) {
+		version = smem_get_version(n);
+		seq_printf(s, "entry %d: smem = %d  proc_comm = %d\n", n,
+			       version >> 16,
+			       version & 0xffff);
+	}
+}
+
+static void debug_read_build_id(struct seq_file *s)
+{
+	unsigned size;
+	void *data;
+
+	data = smem_get_entry(SMEM_HW_SW_BUILD_ID, &size, 0,
+							SMEM_ANY_HOST_FLAG);
+	if (!data)
+		return;
+
+	seq_write(s, data, size);
+}
+
+static int debugfs_show(struct seq_file *s, void *data)
+{
+	void (*show)(struct seq_file *) = s->private;
+
+	show(s);
+
+	return 0;
+}
+
+static int debug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, debugfs_show, inode->i_private);
+}
+
+static const struct file_operations debug_ops = {
+	.open = debug_open,
+	.release = single_release,
+	.read = seq_read,
+	.llseek = seq_lseek,
+};
+
+static void debug_create(const char *name, umode_t mode,
+			 struct dentry *dent,
+			 void (*show)(struct seq_file *))
+{
+	struct dentry *file;
+
+	file = debugfs_create_file(name, mode, dent, show, &debug_ops);
+	if (!file)
+		pr_err("%s: unable to create file '%s'\n", __func__, name);
+}
+
+static int __init smem_debugfs_init(void)
+{
+	struct dentry *dent;
+
+	dent = debugfs_create_dir("smem", 0);
+	if (IS_ERR(dent))
+		return PTR_ERR(dent);
+
+	debug_create("mem", 0444, dent, debug_read_mem);
+	debug_create("version", 0444, dent, debug_read_smem_version);
+
+	/* NNV: this is google only stuff */
+	debug_create("build", 0444, dent, debug_read_build_id);
+
+	return 0;
+}
+
+late_initcall(smem_debugfs_init);
+#endif