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path: root/drivers/misc/mei/wd.c
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Diffstat (limited to 'drivers/misc/mei/wd.c')
-rw-r--r--drivers/misc/mei/wd.c379
1 files changed, 379 insertions, 0 deletions
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
new file mode 100644
index 000000000000..6be5605707b4
--- /dev/null
+++ b/drivers/misc/mei/wd.c
@@ -0,0 +1,379 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/moduleparam.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/sched.h>
+#include <linux/watchdog.h>
+
+#include "mei_dev.h"
+#include "hw.h"
+#include "interface.h"
+#include <linux/mei.h>
+
+static const u8 mei_start_wd_params[] = { 0x02, 0x12, 0x13, 0x10 };
+static const u8 mei_stop_wd_params[] = { 0x02, 0x02, 0x14, 0x10 };
+
+const u8 mei_wd_state_independence_msg[3][4] = {
+ {0x05, 0x02, 0x51, 0x10},
+ {0x05, 0x02, 0x52, 0x10},
+ {0x07, 0x02, 0x01, 0x10}
+};
+
+/*
+ * AMT Watchdog Device
+ */
+#define INTEL_AMT_WATCHDOG_ID "INTCAMT"
+
+/* UUIDs for AMT F/W clients */
+const uuid_le mei_wd_guid = UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, 0x89,
+ 0x9D, 0xA9, 0x15, 0x14, 0xCB,
+ 0x32, 0xAB);
+
+static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
+{
+ dev_dbg(&dev->pdev->dev, "wd: set timeout=%d.\n", timeout);
+ memcpy(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE);
+ memcpy(dev->wd_data + MEI_WD_PARAMS_SIZE, &timeout, sizeof(u16));
+}
+
+/**
+ * host_init_wd - mei initialization wd.
+ *
+ * @dev: the device structure
+ * returns -ENENT if wd client cannot be found
+ * -EIO if write has failed
+ */
+int mei_wd_host_init(struct mei_device *dev)
+{
+ mei_cl_init(&dev->wd_cl, dev);
+
+ /* look for WD client and connect to it */
+ dev->wd_cl.state = MEI_FILE_DISCONNECTED;
+ dev->wd_timeout = AMT_WD_DEFAULT_TIMEOUT;
+
+ /* find ME WD client */
+ mei_find_me_client_update_filext(dev, &dev->wd_cl,
+ &mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
+
+ dev_dbg(&dev->pdev->dev, "wd: check client\n");
+ if (MEI_FILE_CONNECTING != dev->wd_cl.state) {
+ dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
+ return -ENOENT;
+ }
+
+ if (mei_connect(dev, &dev->wd_cl)) {
+ dev_err(&dev->pdev->dev, "wd: failed to connect to the client\n");
+ dev->wd_cl.state = MEI_FILE_DISCONNECTED;
+ dev->wd_cl.host_client_id = 0;
+ return -EIO;
+ }
+ dev->wd_cl.timer_count = CONNECT_TIMEOUT;
+
+ return 0;
+}
+
+/**
+ * mei_wd_send - sends watch dog message to fw.
+ *
+ * @dev: the device structure
+ *
+ * returns 0 if success,
+ * -EIO when message send fails
+ * -EINVAL when invalid message is to be sent
+ */
+int mei_wd_send(struct mei_device *dev)
+{
+ struct mei_msg_hdr *mei_hdr;
+
+ mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
+ mei_hdr->host_addr = dev->wd_cl.host_client_id;
+ mei_hdr->me_addr = dev->wd_cl.me_client_id;
+ mei_hdr->msg_complete = 1;
+ mei_hdr->reserved = 0;
+
+ if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_PARAMS_SIZE))
+ mei_hdr->length = MEI_START_WD_DATA_SIZE;
+ else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE))
+ mei_hdr->length = MEI_WD_PARAMS_SIZE;
+ else
+ return -EINVAL;
+
+ return mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length);
+}
+
+/**
+ * mei_wd_stop - sends watchdog stop message to fw.
+ *
+ * @dev: the device structure
+ * @preserve: indicate if to keep the timeout value
+ *
+ * returns 0 if success,
+ * -EIO when message send fails
+ * -EINVAL when invalid message is to be sent
+ */
+int mei_wd_stop(struct mei_device *dev, bool preserve)
+{
+ int ret;
+ u16 wd_timeout = dev->wd_timeout;
+
+ cancel_delayed_work(&dev->timer_work);
+ if (dev->wd_cl.state != MEI_FILE_CONNECTED || !dev->wd_timeout)
+ return 0;
+
+ dev->wd_timeout = 0;
+ dev->wd_due_counter = 0;
+ memcpy(dev->wd_data, mei_stop_wd_params, MEI_WD_PARAMS_SIZE);
+ dev->stop = true;
+
+ ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
+ if (ret < 0)
+ goto out;
+
+ if (ret && dev->mei_host_buffer_is_empty) {
+ ret = 0;
+ dev->mei_host_buffer_is_empty = false;
+
+ if (!mei_wd_send(dev)) {
+ ret = mei_flow_ctrl_reduce(dev, &dev->wd_cl);
+ if (ret)
+ goto out;
+ } else {
+ dev_err(&dev->pdev->dev, "wd: send stop failed\n");
+ }
+
+ dev->wd_pending = false;
+ } else {
+ dev->wd_pending = true;
+ }
+ dev->wd_stopped = false;
+ mutex_unlock(&dev->device_lock);
+
+ ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
+ dev->wd_stopped, 10 * HZ);
+ mutex_lock(&dev->device_lock);
+ if (dev->wd_stopped) {
+ dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
+ ret = 0;
+ } else {
+ if (!ret)
+ ret = -ETIMEDOUT;
+ dev_warn(&dev->pdev->dev,
+ "wd: stop failed to complete ret=%d.\n", ret);
+ }
+
+ if (preserve)
+ dev->wd_timeout = wd_timeout;
+
+out:
+ return ret;
+}
+
+/*
+ * mei_wd_ops_start - wd start command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_start(struct watchdog_device *wd_dev)
+{
+ int err = -ENODEV;
+ struct mei_device *dev;
+
+ dev = pci_get_drvdata(mei_device);
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ if (dev->mei_state != MEI_ENABLED) {
+ dev_dbg(&dev->pdev->dev,
+ "wd: mei_state != MEI_ENABLED mei_state = %d\n",
+ dev->mei_state);
+ goto end_unlock;
+ }
+
+ if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
+ dev_dbg(&dev->pdev->dev,
+ "MEI Driver is not connected to Watchdog Client\n");
+ goto end_unlock;
+ }
+
+ mei_wd_set_start_timeout(dev, dev->wd_timeout);
+
+ err = 0;
+end_unlock:
+ mutex_unlock(&dev->device_lock);
+ return err;
+}
+
+/*
+ * mei_wd_ops_stop - wd stop command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
+{
+ struct mei_device *dev;
+ dev = pci_get_drvdata(mei_device);
+
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+ mei_wd_stop(dev, false);
+ mutex_unlock(&dev->device_lock);
+
+ return 0;
+}
+
+/*
+ * mei_wd_ops_ping - wd ping command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
+{
+ int ret = 0;
+ struct mei_device *dev;
+ dev = pci_get_drvdata(mei_device);
+
+ if (!dev)
+ return -ENODEV;
+
+ mutex_lock(&dev->device_lock);
+
+ if (dev->wd_cl.state != MEI_FILE_CONNECTED) {
+ dev_err(&dev->pdev->dev, "wd: not connected.\n");
+ ret = -ENODEV;
+ goto end;
+ }
+
+ /* Check if we can send the ping to HW*/
+ if (dev->mei_host_buffer_is_empty &&
+ mei_flow_ctrl_creds(dev, &dev->wd_cl) > 0) {
+
+ dev->mei_host_buffer_is_empty = false;
+ dev_dbg(&dev->pdev->dev, "wd: sending ping\n");
+
+ if (mei_wd_send(dev)) {
+ dev_err(&dev->pdev->dev, "wd: send failed.\n");
+ ret = -EIO;
+ goto end;
+ }
+
+ if (mei_flow_ctrl_reduce(dev, &dev->wd_cl)) {
+ dev_err(&dev->pdev->dev,
+ "wd: mei_flow_ctrl_reduce() failed.\n");
+ ret = -EIO;
+ goto end;
+ }
+
+ } else {
+ dev->wd_pending = true;
+ }
+
+end:
+ mutex_unlock(&dev->device_lock);
+ return ret;
+}
+
+/*
+ * mei_wd_ops_set_timeout - wd set timeout command from the watchdog core.
+ *
+ * @wd_dev - watchdog device struct
+ * @timeout - timeout value to set
+ *
+ * returns 0 if success, negative errno code for failure
+ */
+static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int timeout)
+{
+ struct mei_device *dev;
+ dev = pci_get_drvdata(mei_device);
+
+ if (!dev)
+ return -ENODEV;
+
+ /* Check Timeout value */
+ if (timeout < AMT_WD_MIN_TIMEOUT || timeout > AMT_WD_MAX_TIMEOUT)
+ return -EINVAL;
+
+ mutex_lock(&dev->device_lock);
+
+ dev->wd_timeout = timeout;
+ wd_dev->timeout = timeout;
+ mei_wd_set_start_timeout(dev, dev->wd_timeout);
+
+ mutex_unlock(&dev->device_lock);
+
+ return 0;
+}
+
+/*
+ * Watchdog Device structs
+ */
+static const struct watchdog_ops wd_ops = {
+ .owner = THIS_MODULE,
+ .start = mei_wd_ops_start,
+ .stop = mei_wd_ops_stop,
+ .ping = mei_wd_ops_ping,
+ .set_timeout = mei_wd_ops_set_timeout,
+};
+static const struct watchdog_info wd_info = {
+ .identity = INTEL_AMT_WATCHDOG_ID,
+ .options = WDIOF_KEEPALIVEPING,
+};
+
+static struct watchdog_device amt_wd_dev = {
+ .info = &wd_info,
+ .ops = &wd_ops,
+ .timeout = AMT_WD_DEFAULT_TIMEOUT,
+ .min_timeout = AMT_WD_MIN_TIMEOUT,
+ .max_timeout = AMT_WD_MAX_TIMEOUT,
+};
+
+
+void mei_watchdog_register(struct mei_device *dev)
+{
+ dev_dbg(&dev->pdev->dev, "dev->wd_timeout =%d.\n", dev->wd_timeout);
+
+ dev->wd_due_counter = !!dev->wd_timeout;
+
+ if (watchdog_register_device(&amt_wd_dev)) {
+ dev_err(&dev->pdev->dev,
+ "wd: unable to register watchdog device.\n");
+ dev->wd_interface_reg = false;
+ } else {
+ dev_dbg(&dev->pdev->dev,
+ "wd: successfully register watchdog interface.\n");
+ dev->wd_interface_reg = true;
+ }
+}
+
+void mei_watchdog_unregister(struct mei_device *dev)
+{
+ if (dev->wd_interface_reg)
+ watchdog_unregister_device(&amt_wd_dev);
+ dev->wd_interface_reg = false;
+}
+