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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.c188
1 files changed, 105 insertions, 83 deletions
diff --git a/drivers/misc/mei/wd.c b/drivers/misc/mei/wd.c
index 9299a8c29a6..a84a664dfcc 100644
--- a/drivers/misc/mei/wd.c
+++ b/drivers/misc/mei/wd.c
@@ -21,20 +21,15 @@
#include <linux/sched.h>
#include <linux/watchdog.h>
-#include "mei_dev.h"
-#include "hw.h"
-#include "interface.h"
#include <linux/mei.h>
+#include "mei_dev.h"
+#include "hbm.h"
+#include "client.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
*/
@@ -56,38 +51,53 @@ static void mei_wd_set_start_timeout(struct mei_device *dev, u16 timeout)
* mei_wd_host_init - connect to the watchdog client
*
* @dev: the device structure
- * returns -ENENT if wd client cannot be found
+ *
+ * returns -ENOTTY if wd client cannot be found
* -EIO if write has failed
* 0 on success
*/
int mei_wd_host_init(struct mei_device *dev)
{
+ struct mei_cl *cl = &dev->wd_cl;
int id;
- mei_cl_init(&dev->wd_cl, dev);
+ int ret;
+
+ mei_cl_init(cl, dev);
- /* look for WD client and connect to it */
- dev->wd_cl.state = MEI_FILE_DISCONNECTED;
dev->wd_timeout = MEI_WD_DEFAULT_TIMEOUT;
dev->wd_state = MEI_WD_IDLE;
- /* Connect WD ME client to the host client */
- id = mei_me_cl_link(dev, &dev->wd_cl,
- &mei_wd_guid, MEI_WD_HOST_CLIENT_ID);
+ /* check for valid client id */
+ id = mei_me_cl_by_uuid(dev, &mei_wd_guid);
if (id < 0) {
dev_info(&dev->pdev->dev, "wd: failed to find the client\n");
- return -ENOENT;
+ return -ENOTTY;
}
- 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;
+ cl->me_client_id = dev->me_clients[id].client_id;
+
+ ret = mei_cl_link(cl, MEI_WD_HOST_CLIENT_ID);
+
+ if (ret < 0) {
+ dev_info(&dev->pdev->dev, "wd: failed link client\n");
+ return ret;
}
- dev->wd_cl.timer_count = MEI_CONNECT_TIMEOUT;
- return 0;
+ ret = mei_cl_connect(cl, NULL);
+
+ if (ret) {
+ dev_err(&dev->pdev->dev, "wd: failed to connect = %d\n", ret);
+ mei_cl_unlink(cl);
+ return ret;
+ }
+
+ ret = mei_watchdog_register(dev);
+ if (ret) {
+ mei_cl_disconnect(cl);
+ mei_cl_unlink(cl);
+ }
+ return ret;
}
/**
@@ -98,25 +108,42 @@ int mei_wd_host_init(struct mei_device *dev)
* returns 0 if success,
* -EIO when message send fails
* -EINVAL when invalid message is to be sent
+ * -ENODEV on flow control failure
*/
int mei_wd_send(struct mei_device *dev)
{
- struct mei_msg_hdr *mei_hdr;
+ struct mei_cl *cl = &dev->wd_cl;
+ struct mei_msg_hdr hdr;
+ int ret;
- 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;
+ hdr.host_addr = cl->host_client_id;
+ hdr.me_addr = cl->me_client_id;
+ hdr.msg_complete = 1;
+ hdr.reserved = 0;
+ hdr.internal = 0;
if (!memcmp(dev->wd_data, mei_start_wd_params, MEI_WD_HDR_SIZE))
- mei_hdr->length = MEI_WD_START_MSG_SIZE;
+ hdr.length = MEI_WD_START_MSG_SIZE;
else if (!memcmp(dev->wd_data, mei_stop_wd_params, MEI_WD_HDR_SIZE))
- mei_hdr->length = MEI_WD_STOP_MSG_SIZE;
- else
+ hdr.length = MEI_WD_STOP_MSG_SIZE;
+ else {
+ dev_err(&dev->pdev->dev, "wd: invalid message is to be sent, aborting\n");
return -EINVAL;
+ }
+
+ ret = mei_write_message(dev, &hdr, dev->wd_data);
+ if (ret) {
+ dev_err(&dev->pdev->dev, "wd: write message failed\n");
+ return ret;
+ }
+
+ ret = mei_cl_flow_ctrl_reduce(cl);
+ if (ret) {
+ dev_err(&dev->pdev->dev, "wd: flow_ctrl_reduce failed.\n");
+ return ret;
+ }
- return mei_write_message(dev, mei_hdr, dev->wd_data, mei_hdr->length);
+ return 0;
}
/**
@@ -125,9 +152,11 @@ int mei_wd_send(struct mei_device *dev)
* @dev: the device structure
* @preserve: indicate if to keep the timeout value
*
- * returns 0 if success,
- * -EIO when message send fails
+ * returns 0 if success
+ * on error:
+ * -EIO when message send fails
* -EINVAL when invalid message is to be sent
+ * -ETIME on message timeout
*/
int mei_wd_stop(struct mei_device *dev)
{
@@ -141,22 +170,14 @@ int mei_wd_stop(struct mei_device *dev)
dev->wd_state = MEI_WD_STOPPING;
- ret = mei_flow_ctrl_creds(dev, &dev->wd_cl);
+ ret = mei_cl_flow_ctrl_creds(&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");
- }
+ goto err;
+ if (ret && mei_hbuf_acquire(dev)) {
+ ret = mei_wd_send(dev);
+ if (ret)
+ goto err;
dev->wd_pending = false;
} else {
dev->wd_pending = true;
@@ -164,21 +185,21 @@ int mei_wd_stop(struct mei_device *dev)
mutex_unlock(&dev->device_lock);
- ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
- dev->wd_state == MEI_WD_IDLE,
- msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
+ ret = wait_event_timeout(dev->wait_stop_wd,
+ dev->wd_state == MEI_WD_IDLE,
+ msecs_to_jiffies(MEI_WD_STOP_TIMEOUT));
mutex_lock(&dev->device_lock);
- if (dev->wd_state == MEI_WD_IDLE) {
- dev_dbg(&dev->pdev->dev, "wd: stop completed ret=%d.\n", ret);
- ret = 0;
- } else {
- if (!ret)
- ret = -ETIMEDOUT;
+ if (dev->wd_state != MEI_WD_IDLE) {
+ /* timeout */
+ ret = -ETIME;
dev_warn(&dev->pdev->dev,
"wd: stop failed to complete ret=%d.\n", ret);
+ goto err;
}
-
-out:
+ dev_dbg(&dev->pdev->dev, "wd: stop completed after %u msec\n",
+ MEI_WD_STOP_TIMEOUT - jiffies_to_msecs(ret));
+ return 0;
+err:
return ret;
}
@@ -252,8 +273,8 @@ static int mei_wd_ops_stop(struct watchdog_device *wd_dev)
*/
static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
{
- int ret = 0;
struct mei_device *dev;
+ int ret;
dev = watchdog_get_drvdata(wd_dev);
if (!dev)
@@ -269,26 +290,18 @@ static int mei_wd_ops_ping(struct watchdog_device *wd_dev)
dev->wd_state = MEI_WD_RUNNING;
+ ret = mei_cl_flow_ctrl_creds(&dev->wd_cl);
+ if (ret < 0)
+ 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) {
+ if (ret && mei_hbuf_acquire(dev)) {
- 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;
+ ret = mei_wd_send(dev);
+ if (ret)
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;
- }
-
+ dev->wd_pending = false;
} else {
dev->wd_pending = true;
}
@@ -306,7 +319,8 @@ end:
*
* returns 0 if success, negative errno code for failure
*/
-static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev, unsigned int timeout)
+static int mei_wd_ops_set_timeout(struct watchdog_device *wd_dev,
+ unsigned int timeout)
{
struct mei_device *dev;
@@ -355,17 +369,25 @@ static struct watchdog_device amt_wd_dev = {
};
-void mei_watchdog_register(struct mei_device *dev)
+int mei_watchdog_register(struct mei_device *dev)
{
- if (watchdog_register_device(&amt_wd_dev)) {
- dev_err(&dev->pdev->dev,
- "wd: unable to register watchdog device.\n");
- return;
+
+ int ret;
+
+ /* unlock to perserve correct locking order */
+ mutex_unlock(&dev->device_lock);
+ ret = watchdog_register_device(&amt_wd_dev);
+ mutex_lock(&dev->device_lock);
+ if (ret) {
+ dev_err(&dev->pdev->dev, "wd: unable to register watchdog device = %d.\n",
+ ret);
+ return ret;
}
dev_dbg(&dev->pdev->dev,
"wd: successfully register watchdog interface.\n");
watchdog_set_drvdata(&amt_wd_dev, dev);
+ return 0;
}
void mei_watchdog_unregister(struct mei_device *dev)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 12:04:38 +0000