1 files changed, 448 insertions, 0 deletions

diff --git a/drivers/soc/qcom/remoteqdss.c b/drivers/soc/qcom/remoteqdss.c
new file mode 100644
index 000000000000..5e2a5babdcc8
--- /dev/null
+++ b/drivers/soc/qcom/remoteqdss.c
@@ -0,0 +1,448 @@
+/*
+ * Copyright (c) 2015-2016, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <soc/qcom/scm.h>
+#include <linux/debugfs.h>
+#include <linux/ratelimit.h>
+#include <linux/dma-mapping.h>
+
+#define REMOTEQDSS_FLAG_QUIET (BIT(0))
+
+static unsigned long remoteqdss_dbg_flags;
+module_param_named(dbg_flags, remoteqdss_dbg_flags, ulong, 0644);
+
+static struct dentry *remoteqdss_dir;
+
+#define REMOTEQDSS_ERR(fmt, ...) \
+	pr_debug("%s: " fmt, __func__, ## __VA_ARGS__)
+
+#define REMOTEQDSS_ERR_CALLER(fmt, caller, ...) \
+	pr_debug("%pf: " fmt, caller, ## __VA_ARGS__)
+
+struct qdss_msg_translation {
+	u64 val;
+	char *msg;
+};
+
+/*
+ * id			Unique identifier
+ * sw_entity_group	Array index
+ * sw_event_group	Array index
+ * dir			Parent debugfs directory
+ */
+struct remoteqdss_data {
+	uint32_t id;
+	uint32_t sw_entity_group;
+	uint32_t sw_event_group;
+	struct dentry *dir;
+};
+
+static struct device dma_dev;
+
+/* Allowed message formats */
+
+enum remoteqdss_cmd_id {
+	CMD_ID_QUERY_SWEVENT_TAG,
+	CMD_ID_FILTER_SWTRACE_STATE,
+	CMD_ID_QUERY_SWTRACE_STATE,
+	CMD_ID_FILTER_SWEVENT,
+	CMD_ID_QUERY_SWEVENT,
+	CMD_ID_FILTER_SWENTITY,
+	CMD_ID_QUERY_SWENTITY,
+};
+
+struct remoteqdss_header_fmt {
+	uint32_t subsys_id;
+	uint32_t cmd_id;
+};
+
+struct remoteqdss_filter_swtrace_state_fmt {
+	struct remoteqdss_header_fmt h;
+	uint32_t state;
+};
+
+struct remoteqdss_filter_swevent_fmt {
+	struct remoteqdss_header_fmt h;
+	uint32_t event_group;
+	uint32_t event_mask;
+};
+
+struct remoteqdss_query_swevent_fmt {
+	struct remoteqdss_header_fmt h;
+	uint32_t event_group;
+};
+
+struct remoteqdss_filter_swentity_fmt {
+	struct remoteqdss_header_fmt h;
+	uint32_t entity_group;
+	uint32_t entity_mask;
+};
+
+struct remoteqdss_query_swentity_fmt {
+	struct remoteqdss_header_fmt h;
+	uint32_t entity_group;
+};
+
+/* msgs is a null terminated array */
+static void remoteqdss_err_translation(struct qdss_msg_translation *msgs,
+					u64 err, const void *caller)
+{
+	static DEFINE_RATELIMIT_STATE(rl, 5 * HZ, 2);
+	struct qdss_msg_translation *msg;
+
+	if (!err)
+		return;
+
+	if (remoteqdss_dbg_flags & REMOTEQDSS_FLAG_QUIET)
+		return;
+
+	for (msg = msgs; msg->msg; msg++) {
+		if (err == msg->val && __ratelimit(&rl)) {
+			REMOTEQDSS_ERR_CALLER("0x%llx: %s\n", caller, err,
+						msg->msg);
+			return;
+		}
+	}
+
+	REMOTEQDSS_ERR_CALLER("Error 0x%llx\n", caller, err);
+}
+
+/* Shared across all remoteqdss scm functions */
+#define SCM_CMD_ID (0x1)
+
+/* Response Values */
+#define SCM_CMD_FAIL		(0x80)
+#define SCM_QDSS_UNAVAILABLE	(0x81)
+#define SCM_UNINITIALIZED	(0x82)
+#define SCM_BAD_ARG		(0x83)
+#define SCM_BAD_SUBSYS		(0x85)
+
+static struct qdss_msg_translation remoteqdss_scm_msgs[] = {
+	{SCM_CMD_FAIL,
+		"Command failed"},
+	{SCM_QDSS_UNAVAILABLE,
+		"QDSS not available or cannot turn QDSS (clock) on"},
+	{SCM_UNINITIALIZED,
+		"Tracer not initialized or unable to initialize"},
+	{SCM_BAD_ARG,
+		"Invalid parameter value"},
+	{SCM_BAD_SUBSYS,
+		"Incorrect subsys ID"},
+	{}
+};
+
+static struct remoteqdss_data *create_remoteqdss_data(u32 id)
+{
+	struct remoteqdss_data *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return NULL;
+
+	data->id = id;
+	return data;
+}
+
+static void free_remoteqdss_data(struct remoteqdss_data *data)
+{
+	kfree(data);
+}
+
+static int remoteqdss_do_scm_call(struct scm_desc *desc,
+		dma_addr_t addr, size_t size, const void *caller)
+{
+	int ret;
+
+	memset(desc, 0, sizeof(*desc));
+	desc->args[0] = dma_to_phys(NULL, addr);
+	desc->args[1] = size;
+	desc->arginfo = SCM_ARGS(2, SCM_RO, SCM_VAL);
+
+	ret = scm_call2(
+		SCM_SIP_FNID(SCM_SVC_QDSS, SCM_CMD_ID),
+		desc);
+	if (ret)
+		return ret;
+
+	remoteqdss_err_translation(remoteqdss_scm_msgs, desc->ret[0], caller);
+	ret = desc->ret[0] ? -EINVAL : 0;
+	return ret;
+}
+
+static int remoteqdss_scm_query_swtrace(void *priv, u64 *val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_header_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->subsys_id = data->id;
+	fmt->cmd_id = CMD_ID_QUERY_SWTRACE_STATE;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+	*val = desc.ret[1];
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+static int remoteqdss_scm_filter_swtrace(void *priv, u64 val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_filter_swtrace_state_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->h.subsys_id = data->id;
+	fmt->h.cmd_id = CMD_ID_FILTER_SWTRACE_STATE;
+	fmt->state = (uint32_t)val;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_sw_trace_output,
+			remoteqdss_scm_query_swtrace,
+			remoteqdss_scm_filter_swtrace,
+			"0x%llx\n");
+
+static int remoteqdss_scm_query_tag(void *priv, u64 *val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_header_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->subsys_id = data->id;
+	fmt->cmd_id = CMD_ID_QUERY_SWEVENT_TAG;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+	*val = desc.ret[1];
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_tag,
+			remoteqdss_scm_query_tag,
+			NULL,
+			"0x%llx\n");
+
+static int remoteqdss_scm_query_swevent(void *priv, u64 *val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_query_swevent_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->h.subsys_id = data->id;
+	fmt->h.cmd_id = CMD_ID_QUERY_SWEVENT;
+	fmt->event_group = data->sw_event_group;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+	*val = desc.ret[1];
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+static int remoteqdss_scm_filter_swevent(void *priv, u64 val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_filter_swevent_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->h.subsys_id = data->id;
+	fmt->h.cmd_id = CMD_ID_FILTER_SWEVENT;
+	fmt->event_group = data->sw_event_group;
+	fmt->event_mask = (uint32_t)val;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_swevent,
+			remoteqdss_scm_query_swevent,
+			remoteqdss_scm_filter_swevent,
+			"0x%llx\n");
+
+static int remoteqdss_scm_query_swentity(void *priv, u64 *val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_query_swentity_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->h.subsys_id = data->id;
+	fmt->h.cmd_id = CMD_ID_QUERY_SWENTITY;
+	fmt->entity_group = data->sw_entity_group;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+	*val = desc.ret[1];
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+static int remoteqdss_scm_filter_swentity(void *priv, u64 val)
+{
+	struct remoteqdss_data *data = priv;
+	int ret;
+	struct scm_desc desc;
+	struct remoteqdss_filter_swentity_fmt *fmt;
+	dma_addr_t addr;
+
+	fmt = dma_alloc_coherent(&dma_dev, sizeof(*fmt), &addr, GFP_KERNEL);
+	if (!fmt)
+		return -ENOMEM;
+	fmt->h.subsys_id = data->id;
+	fmt->h.cmd_id = CMD_ID_FILTER_SWENTITY;
+	fmt->entity_group = data->sw_entity_group;
+	fmt->entity_mask = (uint32_t)val;
+
+	ret = remoteqdss_do_scm_call(&desc, addr, sizeof(*fmt),
+					__builtin_return_address(0));
+
+	dma_free_coherent(&dma_dev, sizeof(*fmt), fmt, addr);
+	return ret;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_swentity,
+			remoteqdss_scm_query_swentity,
+			remoteqdss_scm_filter_swentity,
+			"0x%llx\n");
+
+static void __init enumerate_scm_devices(struct dentry *parent)
+{
+	u64 unused;
+	int ret;
+	struct remoteqdss_data *data;
+	struct dentry *dentry;
+
+	if (!is_scm_armv8())
+		return;
+
+	data = create_remoteqdss_data(0);
+	if (!data)
+		return;
+
+	/* Assume failure means device not present */
+	ret = remoteqdss_scm_query_swtrace(data, &unused);
+	if (ret)
+		goto out;
+
+	data->dir = debugfs_create_dir("tz", parent);
+	if (IS_ERR_OR_NULL(data->dir))
+		goto out;
+
+	dentry = debugfs_create_file("sw_trace_output", S_IRUGO | S_IWUSR,
+			data->dir, data, &fops_sw_trace_output);
+	if (IS_ERR_OR_NULL(dentry))
+		goto out;
+
+	dentry = debugfs_create_u32("sw_entity_group", S_IRUGO | S_IWUSR,
+			data->dir, &data->sw_entity_group);
+	if (IS_ERR_OR_NULL(dentry))
+		goto out;
+
+	dentry = debugfs_create_u32("sw_event_group", S_IRUGO | S_IWUSR,
+			data->dir, &data->sw_event_group);
+	if (IS_ERR_OR_NULL(dentry))
+		goto out;
+
+	dentry = debugfs_create_file("tag", S_IRUGO,
+			data->dir, data, &fops_tag);
+	if (IS_ERR_OR_NULL(dentry))
+		goto out;
+
+	dentry = debugfs_create_file("swevent", S_IRUGO | S_IWUSR,
+			data->dir, data, &fops_swevent);
+	if (IS_ERR_OR_NULL(dentry))
+		goto out;
+
+	dentry = debugfs_create_file("swentity", S_IRUGO | S_IWUSR,
+			data->dir, data, &fops_swentity);
+	if (IS_ERR_OR_NULL(dentry))
+		goto out;
+
+	return;
+
+out:
+	debugfs_remove_recursive(data->dir);
+	free_remoteqdss_data(data);
+}
+
+static int __init remoteqdss_init(void)
+{
+	unsigned long old_flags = remoteqdss_dbg_flags;
+	int ret;
+
+	/* Set up DMA */
+	arch_setup_dma_ops(&dma_dev, 0, U64_MAX, NULL, false);
+	ret = dma_coerce_mask_and_coherent(&dma_dev, DMA_BIT_MASK(64));
+	if (ret)
+		return ret;
+
+	/*
+	 * disable normal error messages while checking
+	 * if support is present.
+	 */
+	remoteqdss_dbg_flags |= REMOTEQDSS_FLAG_QUIET;
+
+	remoteqdss_dir = debugfs_create_dir("remoteqdss", NULL);
+	if (!remoteqdss_dir)
+		return 0;
+
+	enumerate_scm_devices(remoteqdss_dir);
+
+	remoteqdss_dbg_flags = old_flags;
+	return 0;
+}
+late_initcall(remoteqdss_init);