mei: add a reference from the host client to the me client

Keep a pointer to associated me client in the host client object to
eliminate me client searches. Check if the me client is active in the
firmware by checking if its is linked on the me clients list
Add accessors for the me client properties from host client.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 52 insertions, 66 deletions

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 3f8bb90dbb58..aa1d35a51e9f 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -83,7 +83,7 @@ void mei_me_cl_put(struct mei_me_client *me_cl)
 }
 
 /**
- * __mei_me_cl_del  - delete me client form the list and decrease
+ * __mei_me_cl_del  - delete me client from the list and decrease
  *     reference counter
  *
  * @dev: mei device
@@ -96,11 +96,25 @@ static void __mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
 	if (!me_cl)
 		return;
 
-	list_del(&me_cl->list);
+	list_del_init(&me_cl->list);
 	mei_me_cl_put(me_cl);
 }
 
 /**
+ * mei_me_cl_del - delete me client from the list and decrease
+ *     reference counter
+ *
+ * @dev: mei device
+ * @me_cl: me client
+ */
+void mei_me_cl_del(struct mei_device *dev, struct mei_me_client *me_cl)
+{
+	down_write(&dev->me_clients_rwsem);
+	__mei_me_cl_del(dev, me_cl);
+	up_write(&dev->me_clients_rwsem);
+}
+
+/**
  * mei_me_cl_add - add me client to the list
  *
  * @dev: mei device
@@ -317,7 +331,7 @@ static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
 {
 	return cl1 && cl2 &&
 		(cl1->host_client_id == cl2->host_client_id) &&
-		(cl1->me_client_id == cl2->me_client_id);
+		(mei_cl_me_id(cl1) == mei_cl_me_id(cl2));
 }
 
 /**
@@ -620,7 +634,7 @@ int mei_cl_link(struct mei_cl *cl, int id)
 }
 
 /**
- * mei_cl_unlink - remove me_cl from the list
+ * mei_cl_unlink - remove host client from the list
  *
  * @cl: host client
  *
@@ -668,17 +682,17 @@ void mei_host_client_init(struct work_struct *work)
 
 	me_cl = mei_me_cl_by_uuid(dev, &mei_amthif_guid);
 	if (me_cl)
-		mei_amthif_host_init(dev);
+		mei_amthif_host_init(dev, me_cl);
 	mei_me_cl_put(me_cl);
 
 	me_cl = mei_me_cl_by_uuid(dev, &mei_wd_guid);
 	if (me_cl)
-		mei_wd_host_init(dev);
+		mei_wd_host_init(dev, me_cl);
 	mei_me_cl_put(me_cl);
 
 	me_cl = mei_me_cl_by_uuid(dev, &mei_nfc_guid);
 	if (me_cl)
-		mei_nfc_host_init(dev);
+		mei_nfc_host_init(dev, me_cl);
 	mei_me_cl_put(me_cl);
 
 
@@ -734,6 +748,9 @@ void mei_cl_set_disconnected(struct mei_cl *cl)
 	mei_io_list_flush(&dev->ctrl_wr_list, cl);
 	cl->mei_flow_ctrl_creds = 0;
 	cl->timer_count = 0;
+
+	mei_me_cl_put(cl->me_cl);
+	cl->me_cl = NULL;
 }
 
 /*
@@ -890,7 +907,7 @@ static bool mei_cl_is_other_connecting(struct mei_cl *cl)
 
 	list_for_each_entry(cb, &dev->ctrl_rd_list.list, list) {
 		if (cb->fop_type == MEI_FOP_CONNECT &&
-		    cl->me_client_id == cb->cl->me_client_id)
+		    mei_cl_me_id(cl) == mei_cl_me_id(cb->cl))
 			return true;
 	}
 
@@ -961,13 +978,15 @@ int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
  * mei_cl_connect - connect host client to the me one
  *
  * @cl: host client
+ * @me_cl: me client
  * @file: pointer to file structure
  *
  * Locking: called under "dev->device_lock" lock
  *
  * Return: 0 on success, <0 on failure.
  */
-int mei_cl_connect(struct mei_cl *cl, struct file *file)
+int mei_cl_connect(struct mei_cl *cl, struct mei_me_client *me_cl,
+		   struct file *file)
 {
 	struct mei_device *dev;
 	struct mei_cl_cb *cb;
@@ -990,6 +1009,12 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
 	if (rets)
 		goto out;
 
+	cl->me_cl = mei_me_cl_get(me_cl);
+	if (!cl->me_cl) {
+		rets = -ENODEV;
+		goto out;
+	}
+
 	cl->state = MEI_FILE_CONNECTING;
 	list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
 
@@ -1064,36 +1089,20 @@ err:
  * @cl: private data of the file object
  *
  * Return: 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
- *	-ENOENT if mei_cl is not present
- *	-EINVAL if single_recv_buf == 0
  */
 int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
 {
-	struct mei_device *dev;
-	struct mei_me_client *me_cl;
-	int rets = 0;
-
-	if (WARN_ON(!cl || !cl->dev))
+	if (WARN_ON(!cl || !cl->me_cl))
 		return -EINVAL;
 
-	dev = cl->dev;
-
 	if (cl->mei_flow_ctrl_creds > 0)
 		return 1;
 
-	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
-	if (!me_cl) {
-		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
-		return -ENOENT;
+	if (mei_cl_is_single_recv_buf(cl)) {
+		if (cl->me_cl->mei_flow_ctrl_creds > 0)
+			return 1;
 	}
-
-	if (me_cl->mei_flow_ctrl_creds > 0) {
-		rets = 1;
-		if (WARN_ON(me_cl->props.single_recv_buf == 0))
-			rets = -EINVAL;
-	}
-	mei_me_cl_put(me_cl);
-	return rets;
+	return 0;
 }
 
 /**
@@ -1103,43 +1112,23 @@ int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
  *
  * Return:
  *	0 on success
- *	-ENOENT when me client is not found
  *	-EINVAL when ctrl credits are <= 0
  */
 int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
 {
-	struct mei_device *dev;
-	struct mei_me_client *me_cl;
-	int rets;
-
-	if (WARN_ON(!cl || !cl->dev))
+	if (WARN_ON(!cl || !cl->me_cl))
 		return -EINVAL;
 
-	dev = cl->dev;
-
-	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
-	if (!me_cl) {
-		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
-		return -ENOENT;
-	}
-
-	if (me_cl->props.single_recv_buf) {
-		if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0)) {
-			rets = -EINVAL;
-			goto out;
-		}
-		me_cl->mei_flow_ctrl_creds--;
+	if (mei_cl_is_single_recv_buf(cl)) {
+		if (WARN_ON(cl->me_cl->mei_flow_ctrl_creds <= 0))
+			return -EINVAL;
+		cl->me_cl->mei_flow_ctrl_creds--;
 	} else {
-		if (WARN_ON(cl->mei_flow_ctrl_creds <= 0)) {
-			rets = -EINVAL;
-			goto out;
-		}
+		if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
+			return -EINVAL;
 		cl->mei_flow_ctrl_creds--;
 	}
-	rets = 0;
-out:
-	mei_me_cl_put(me_cl);
-	return rets;
+	return 0;
 }
 
 /**
@@ -1155,7 +1144,6 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
 {
 	struct mei_device *dev;
 	struct mei_cl_cb *cb;
-	struct mei_me_client *me_cl;
 	int rets;
 
 	if (WARN_ON(!cl || !cl->dev))
@@ -1170,14 +1158,12 @@ int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp)
 	if (!list_empty(&cl->rd_pending))
 		return -EBUSY;
 
-	me_cl = mei_me_cl_by_uuid_id(dev, &cl->cl_uuid, cl->me_client_id);
-	if (!me_cl) {
-		cl_err(dev, cl, "no such me client %d\n", cl->me_client_id);
+	if (!mei_me_cl_is_active(cl->me_cl)) {
+		cl_err(dev, cl, "no such me client\n");
 		return  -ENOTTY;
 	}
 	/* always allocate at least client max message */
-	length = max_t(size_t, length, me_cl->props.max_msg_length);
-	mei_me_cl_put(me_cl);
+	length = max_t(size_t, length, mei_cl_mtu(cl));
 
 	rets = pm_runtime_get(dev->dev);
 	if (rets < 0 && rets != -EINPROGRESS) {
@@ -1254,7 +1240,7 @@ int mei_cl_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
 	msg_slots = mei_data2slots(len);
 
 	mei_hdr.host_addr = cl->host_client_id;
-	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.me_addr = mei_cl_me_id(cl);
 	mei_hdr.reserved = 0;
 	mei_hdr.internal = cb->internal;
 
@@ -1338,7 +1324,7 @@ int mei_cl_write(struct mei_cl *cl, struct mei_cl_cb *cb, bool blocking)
 	cl->writing_state = MEI_IDLE;
 
 	mei_hdr.host_addr = cl->host_client_id;
-	mei_hdr.me_addr = cl->me_client_id;
+	mei_hdr.me_addr = mei_cl_me_id(cl);
 	mei_hdr.reserved = 0;
 	mei_hdr.msg_complete = 0;
 	mei_hdr.internal = cb->internal;