Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

3 files changed, 495 insertions, 0 deletions

diff --git a/samples/mei/.gitignore b/samples/mei/.gitignore
new file mode 100644
index 000000000..fe894bcb6
--- /dev/null
+++ b/samples/mei/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/mei-amt-version
diff --git a/samples/mei/Makefile b/samples/mei/Makefile
new file mode 100644
index 000000000..c54b8a0ab
--- /dev/null
+++ b/samples/mei/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2012-2019, Intel Corporation. All rights reserved.
+userprogs-always-y += mei-amt-version
+
+userccflags += -I usr/include
diff --git a/samples/mei/mei-amt-version.c b/samples/mei/mei-amt-version.c
new file mode 100644
index 000000000..1d7254bcb
--- /dev/null
+++ b/samples/mei/mei-amt-version.c
@@ -0,0 +1,488 @@
+/******************************************************************************
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Intel MEI Interface Header
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ *	Intel Corporation.
+ *	linux-mei@linux.intel.com
+ *	http://www.intel.com
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <linux/mei.h>
+
+/*****************************************************************************
+ * Intel Management Engine Interface
+ *****************************************************************************/
+
+#define mei_msg(_me, fmt, ARGS...) do {         \
+	if (_me->verbose)                       \
+		fprintf(stderr, fmt, ##ARGS);	\
+} while (0)
+
+#define mei_err(_me, fmt, ARGS...) do {         \
+	fprintf(stderr, "Error: " fmt, ##ARGS); \
+} while (0)
+
+struct mei {
+	uuid_le guid;
+	bool initialized;
+	bool verbose;
+	unsigned int buf_size;
+	unsigned char prot_ver;
+	int fd;
+};
+
+static void mei_deinit(struct mei *cl)
+{
+	if (cl->fd != -1)
+		close(cl->fd);
+	cl->fd = -1;
+	cl->buf_size = 0;
+	cl->prot_ver = 0;
+	cl->initialized = false;
+}
+
+static bool mei_init(struct mei *me, const uuid_le *guid,
+		unsigned char req_protocol_version, bool verbose)
+{
+	int result;
+	struct mei_client *cl;
+	struct mei_connect_client_data data;
+
+	me->verbose = verbose;
+
+	me->fd = open("/dev/mei0", O_RDWR);
+	if (me->fd == -1) {
+		mei_err(me, "Cannot establish a handle to the Intel MEI driver\n");
+		goto err;
+	}
+	memcpy(&me->guid, guid, sizeof(*guid));
+	memset(&data, 0, sizeof(data));
+	me->initialized = true;
+
+	memcpy(&data.in_client_uuid, &me->guid, sizeof(me->guid));
+	result = ioctl(me->fd, IOCTL_MEI_CONNECT_CLIENT, &data);
+	if (result) {
+		mei_err(me, "IOCTL_MEI_CONNECT_CLIENT receive message. err=%d\n", result);
+		goto err;
+	}
+	cl = &data.out_client_properties;
+	mei_msg(me, "max_message_length %d\n", cl->max_msg_length);
+	mei_msg(me, "protocol_version %d\n", cl->protocol_version);
+
+	if ((req_protocol_version > 0) &&
+	     (cl->protocol_version != req_protocol_version)) {
+		mei_err(me, "Intel MEI protocol version not supported\n");
+		goto err;
+	}
+
+	me->buf_size = cl->max_msg_length;
+	me->prot_ver = cl->protocol_version;
+
+	return true;
+err:
+	mei_deinit(me);
+	return false;
+}
+
+static ssize_t mei_recv_msg(struct mei *me, unsigned char *buffer,
+			ssize_t len, unsigned long timeout)
+{
+	struct timeval tv;
+	fd_set set;
+	ssize_t rc;
+
+	tv.tv_sec = timeout / 1000;
+	tv.tv_usec = (timeout % 1000) * 1000000;
+
+	mei_msg(me, "call read length = %zd\n", len);
+
+	FD_ZERO(&set);
+	FD_SET(me->fd, &set);
+	rc = select(me->fd + 1, &set, NULL, NULL, &tv);
+	if (rc > 0 && FD_ISSET(me->fd, &set)) {
+		mei_msg(me, "have reply\n");
+	} else if (rc == 0) {
+		rc = -1;
+		mei_err(me, "read failed on timeout\n");
+		goto out;
+	} else { /* rc < 0 */
+		rc = errno;
+		mei_err(me, "read failed on select with status %zd %s\n",
+			rc, strerror(errno));
+		goto out;
+	}
+
+	rc = read(me->fd, buffer, len);
+	if (rc < 0) {
+		mei_err(me, "read failed with status %zd %s\n",
+				rc, strerror(errno));
+		goto out;
+	}
+
+	mei_msg(me, "read succeeded with result %zd\n", rc);
+
+out:
+	if (rc < 0)
+		mei_deinit(me);
+
+	return rc;
+}
+
+static ssize_t mei_send_msg(struct mei *me, const unsigned char *buffer,
+			ssize_t len, unsigned long timeout)
+{
+	ssize_t written;
+	ssize_t rc;
+
+	mei_msg(me, "call write length = %zd\n", len);
+
+	written = write(me->fd, buffer, len);
+	if (written < 0) {
+		rc = -errno;
+		mei_err(me, "write failed with status %zd %s\n",
+			written, strerror(errno));
+		goto out;
+	}
+	mei_msg(me, "write success\n");
+
+	rc = written;
+out:
+	if (rc < 0)
+		mei_deinit(me);
+
+	return rc;
+}
+
+/***************************************************************************
+ * Intel Advanced Management Technology ME Client
+ ***************************************************************************/
+
+#define AMT_MAJOR_VERSION 1
+#define AMT_MINOR_VERSION 1
+
+#define AMT_STATUS_SUCCESS                0x0
+#define AMT_STATUS_INTERNAL_ERROR         0x1
+#define AMT_STATUS_NOT_READY              0x2
+#define AMT_STATUS_INVALID_AMT_MODE       0x3
+#define AMT_STATUS_INVALID_MESSAGE_LENGTH 0x4
+
+#define AMT_STATUS_HOST_IF_EMPTY_RESPONSE  0x4000
+#define AMT_STATUS_SDK_RESOURCES      0x1004
+
+
+#define AMT_BIOS_VERSION_LEN   65
+#define AMT_VERSIONS_NUMBER    50
+#define AMT_UNICODE_STRING_LEN 20
+
+struct amt_unicode_string {
+	uint16_t length;
+	char string[AMT_UNICODE_STRING_LEN];
+} __attribute__((packed));
+
+struct amt_version_type {
+	struct amt_unicode_string description;
+	struct amt_unicode_string version;
+} __attribute__((packed));
+
+struct amt_version {
+	uint8_t major;
+	uint8_t minor;
+} __attribute__((packed));
+
+struct amt_code_versions {
+	uint8_t bios[AMT_BIOS_VERSION_LEN];
+	uint32_t count;
+	struct amt_version_type versions[AMT_VERSIONS_NUMBER];
+} __attribute__((packed));
+
+/***************************************************************************
+ * Intel Advanced Management Technology Host Interface
+ ***************************************************************************/
+
+struct amt_host_if_msg_header {
+	struct amt_version version;
+	uint16_t _reserved;
+	uint32_t command;
+	uint32_t length;
+} __attribute__((packed));
+
+struct amt_host_if_resp_header {
+	struct amt_host_if_msg_header header;
+	uint32_t status;
+	unsigned char data[];
+} __attribute__((packed));
+
+const uuid_le MEI_IAMTHIF = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,  \
+				0xac, 0xa8, 0x46, 0xe0, 0xff, 0x65, 0x81, 0x4c);
+
+#define AMT_HOST_IF_CODE_VERSIONS_REQUEST  0x0400001A
+#define AMT_HOST_IF_CODE_VERSIONS_RESPONSE 0x0480001A
+
+const struct amt_host_if_msg_header CODE_VERSION_REQ = {
+	.version = {AMT_MAJOR_VERSION, AMT_MINOR_VERSION},
+	._reserved = 0,
+	.command = AMT_HOST_IF_CODE_VERSIONS_REQUEST,
+	.length = 0
+};
+
+
+struct amt_host_if {
+	struct mei mei_cl;
+	unsigned long send_timeout;
+	bool initialized;
+};
+
+
+static bool amt_host_if_init(struct amt_host_if *acmd,
+		      unsigned long send_timeout, bool verbose)
+{
+	acmd->send_timeout = (send_timeout) ? send_timeout : 20000;
+	acmd->initialized = mei_init(&acmd->mei_cl, &MEI_IAMTHIF, 0, verbose);
+	return acmd->initialized;
+}
+
+static void amt_host_if_deinit(struct amt_host_if *acmd)
+{
+	mei_deinit(&acmd->mei_cl);
+	acmd->initialized = false;
+}
+
+static uint32_t amt_verify_code_versions(const struct amt_host_if_resp_header *resp)
+{
+	uint32_t status = AMT_STATUS_SUCCESS;
+	struct amt_code_versions *code_ver;
+	size_t code_ver_len;
+	uint32_t ver_type_cnt;
+	uint32_t len;
+	uint32_t i;
+
+	code_ver = (struct amt_code_versions *)resp->data;
+	/* length - sizeof(status) */
+	code_ver_len = resp->header.length - sizeof(uint32_t);
+	ver_type_cnt = code_ver_len -
+			sizeof(code_ver->bios) -
+			sizeof(code_ver->count);
+	if (code_ver->count != ver_type_cnt / sizeof(struct amt_version_type)) {
+		status = AMT_STATUS_INTERNAL_ERROR;
+		goto out;
+	}
+
+	for (i = 0; i < code_ver->count; i++) {
+		len = code_ver->versions[i].description.length;
+
+		if (len > AMT_UNICODE_STRING_LEN) {
+			status = AMT_STATUS_INTERNAL_ERROR;
+			goto out;
+		}
+
+		len = code_ver->versions[i].version.length;
+		if (code_ver->versions[i].version.string[len] != '\0' ||
+		    len != strlen(code_ver->versions[i].version.string)) {
+			status = AMT_STATUS_INTERNAL_ERROR;
+			goto out;
+		}
+	}
+out:
+	return status;
+}
+
+static uint32_t amt_verify_response_header(uint32_t command,
+				const struct amt_host_if_msg_header *resp_hdr,
+				uint32_t response_size)
+{
+	if (response_size < sizeof(struct amt_host_if_resp_header)) {
+		return AMT_STATUS_INTERNAL_ERROR;
+	} else if (response_size != (resp_hdr->length +
+				sizeof(struct amt_host_if_msg_header))) {
+		return AMT_STATUS_INTERNAL_ERROR;
+	} else if (resp_hdr->command != command) {
+		return AMT_STATUS_INTERNAL_ERROR;
+	} else if (resp_hdr->_reserved != 0) {
+		return AMT_STATUS_INTERNAL_ERROR;
+	} else if (resp_hdr->version.major != AMT_MAJOR_VERSION ||
+		   resp_hdr->version.minor < AMT_MINOR_VERSION) {
+		return AMT_STATUS_INTERNAL_ERROR;
+	}
+	return AMT_STATUS_SUCCESS;
+}
+
+static uint32_t amt_host_if_call(struct amt_host_if *acmd,
+			const unsigned char *command, ssize_t command_sz,
+			uint8_t **read_buf, uint32_t rcmd,
+			unsigned int expected_sz)
+{
+	uint32_t in_buf_sz;
+	ssize_t out_buf_sz;
+	ssize_t written;
+	uint32_t status;
+	struct amt_host_if_resp_header *msg_hdr;
+
+	in_buf_sz = acmd->mei_cl.buf_size;
+	*read_buf = (uint8_t *)malloc(sizeof(uint8_t) * in_buf_sz);
+	if (*read_buf == NULL)
+		return AMT_STATUS_SDK_RESOURCES;
+	memset(*read_buf, 0, in_buf_sz);
+	msg_hdr = (struct amt_host_if_resp_header *)*read_buf;
+
+	written = mei_send_msg(&acmd->mei_cl,
+				command, command_sz, acmd->send_timeout);
+	if (written != command_sz)
+		return AMT_STATUS_INTERNAL_ERROR;
+
+	out_buf_sz = mei_recv_msg(&acmd->mei_cl, *read_buf, in_buf_sz, 2000);
+	if (out_buf_sz <= 0)
+		return AMT_STATUS_HOST_IF_EMPTY_RESPONSE;
+
+	status = msg_hdr->status;
+	if (status != AMT_STATUS_SUCCESS)
+		return status;
+
+	status = amt_verify_response_header(rcmd,
+				&msg_hdr->header, out_buf_sz);
+	if (status != AMT_STATUS_SUCCESS)
+		return status;
+
+	if (expected_sz && expected_sz != out_buf_sz)
+		return AMT_STATUS_INTERNAL_ERROR;
+
+	return AMT_STATUS_SUCCESS;
+}
+
+
+static uint32_t amt_get_code_versions(struct amt_host_if *cmd,
+			       struct amt_code_versions *versions)
+{
+	struct amt_host_if_resp_header *response = NULL;
+	uint32_t status;
+
+	status = amt_host_if_call(cmd,
+			(const unsigned char *)&CODE_VERSION_REQ,
+			sizeof(CODE_VERSION_REQ),
+			(uint8_t **)&response,
+			AMT_HOST_IF_CODE_VERSIONS_RESPONSE, 0);
+
+	if (status != AMT_STATUS_SUCCESS)
+		goto out;
+
+	status = amt_verify_code_versions(response);
+	if (status != AMT_STATUS_SUCCESS)
+		goto out;
+
+	memcpy(versions, response->data, sizeof(struct amt_code_versions));
+out:
+	if (response != NULL)
+		free(response);
+
+	return status;
+}
+
+/************************** end of amt_host_if_command ***********************/
+int main(int argc, char **argv)
+{
+	struct amt_code_versions ver;
+	struct amt_host_if acmd;
+	unsigned int i;
+	uint32_t status;
+	int ret;
+	bool verbose;
+
+	verbose = (argc > 1 && strcmp(argv[1], "-v") == 0);
+
+	if (!amt_host_if_init(&acmd, 5000, verbose)) {
+		ret = 1;
+		goto out;
+	}
+
+	status = amt_get_code_versions(&acmd, &ver);
+
+	amt_host_if_deinit(&acmd);
+
+	switch (status) {
+	case AMT_STATUS_HOST_IF_EMPTY_RESPONSE:
+		printf("Intel AMT: DISABLED\n");
+		ret = 0;
+		break;
+	case AMT_STATUS_SUCCESS:
+		printf("Intel AMT: ENABLED\n");
+		for (i = 0; i < ver.count; i++) {
+			printf("%s:\t%s\n", ver.versions[i].description.string,
+				ver.versions[i].version.string);
+		}
+		ret = 0;
+		break;
+	default:
+		printf("An error has occurred\n");
+		ret = 1;
+		break;
+	}
+
+out:
+	return ret;
+}