mei: drop wr_msg from the mei_dev structure

The control messages are usually small, around 8 bytes, and can be
allocated on the stack.
Using on stack allocation allows us to drop 'wr_msg' a rather large
buffer reserved in the mei_dev structure and relax contention
of this device global buffer.

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>

2 files changed, 68 insertions, 79 deletions

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 5aa606c8a827..085f3aafe6fa 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -132,6 +132,7 @@ static inline void mei_hbm_hdr(struct mei_msg_hdr *hdr, size_t length)
         hdr->length = length;
         hdr->msg_complete = 1;
         hdr->reserved = 0;
+        hdr->internal = 0;
 }
 
 /**
@@ -165,15 +166,15 @@ void mei_hbm_cl_hdr(struct mei_cl *cl, u8 hbm_cmd, void *buf, size_t len)
  * Return: 0 on success, <0 on failure.
  */
 static inline
-int mei_hbm_cl_write(struct mei_device *dev,
-                     struct mei_cl *cl, u8 hbm_cmd, size_t len)
+int mei_hbm_cl_write(struct mei_device *dev, struct mei_cl *cl,
+                     u8 hbm_cmd, u8 *buf, size_t len)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
+        struct mei_msg_hdr mei_hdr;
 
-        mei_hbm_hdr(mei_hdr, len);
-        mei_hbm_cl_hdr(cl, hbm_cmd, dev->wr_msg.data, len);
+        mei_hbm_hdr(&mei_hdr, len);
+        mei_hbm_cl_hdr(cl, hbm_cmd, buf, len);
 
-        return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        return mei_write_message(dev, &mei_hdr, buf);
 }
 
 /**
@@ -250,24 +251,23 @@ int mei_hbm_start_wait(struct mei_device *dev)
  */
 int mei_hbm_start_req(struct mei_device *dev)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_host_version_request *start_req;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_host_version_request start_req;
         const size_t len = sizeof(struct hbm_host_version_request);
         int ret;
 
         mei_hbm_reset(dev);
 
-        mei_hbm_hdr(mei_hdr, len);
+        mei_hbm_hdr(&mei_hdr, len);
 
         /* host start message */
-        start_req = (struct hbm_host_version_request *)dev->wr_msg.data;
-        memset(start_req, 0, len);
-        start_req->hbm_cmd = HOST_START_REQ_CMD;
-        start_req->host_version.major_version = HBM_MAJOR_VERSION;
-        start_req->host_version.minor_version = HBM_MINOR_VERSION;
+        memset(&start_req, 0, len);
+        start_req.hbm_cmd = HOST_START_REQ_CMD;
+        start_req.host_version.major_version = HBM_MAJOR_VERSION;
+        start_req.host_version.minor_version = HBM_MINOR_VERSION;
 
         dev->hbm_state = MEI_HBM_IDLE;
-        ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        ret = mei_write_message(dev, &mei_hdr, &start_req);
         if (ret) {
                 dev_err(dev->dev, "version message write failed: ret = %d\n",
                         ret);
@@ -288,23 +288,22 @@ int mei_hbm_start_req(struct mei_device *dev)
  */
 static int mei_hbm_enum_clients_req(struct mei_device *dev)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_host_enum_request *enum_req;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_host_enum_request enum_req;
         const size_t len = sizeof(struct hbm_host_enum_request);
         int ret;
 
         /* enumerate clients */
-        mei_hbm_hdr(mei_hdr, len);
+        mei_hbm_hdr(&mei_hdr, len);
 
-        enum_req = (struct hbm_host_enum_request *)dev->wr_msg.data;
-        memset(enum_req, 0, len);
-        enum_req->hbm_cmd = HOST_ENUM_REQ_CMD;
-        enum_req->flags |= dev->hbm_f_dc_supported ?
-                           MEI_HBM_ENUM_F_ALLOW_ADD : 0;
-        enum_req->flags |= dev->hbm_f_ie_supported ?
-                           MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
+        memset(&enum_req, 0, len);
+        enum_req.hbm_cmd = HOST_ENUM_REQ_CMD;
+        enum_req.flags |= dev->hbm_f_dc_supported ?
+                          MEI_HBM_ENUM_F_ALLOW_ADD : 0;
+        enum_req.flags |= dev->hbm_f_ie_supported ?
+                          MEI_HBM_ENUM_F_IMMEDIATE_ENUM : 0;
 
-        ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        ret = mei_write_message(dev, &mei_hdr, &enum_req);
         if (ret) {
                 dev_err(dev->dev, "enumeration request write failed: ret = %d.\n",
                         ret);
@@ -358,23 +357,21 @@ static int mei_hbm_me_cl_add(struct mei_device *dev,
  */
 static int mei_hbm_add_cl_resp(struct mei_device *dev, u8 addr, u8 status)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_add_client_response *resp;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_add_client_response resp;
         const size_t len = sizeof(struct hbm_add_client_response);
         int ret;
 
         dev_dbg(dev->dev, "adding client response\n");
 
-        resp = (struct hbm_add_client_response *)dev->wr_msg.data;
+        mei_hbm_hdr(&mei_hdr, len);
 
-        mei_hbm_hdr(mei_hdr, len);
-        memset(resp, 0, sizeof(struct hbm_add_client_response));
+        memset(&resp, 0, sizeof(struct hbm_add_client_response));
+        resp.hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
+        resp.me_addr = addr;
+        resp.status  = status;
 
-        resp->hbm_cmd = MEI_HBM_ADD_CLIENT_RES_CMD;
-        resp->me_addr = addr;
-        resp->status  = status;
-
-        ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        ret = mei_write_message(dev, &mei_hdr, &resp);
         if (ret)
                 dev_err(dev->dev, "add client response write failed: ret = %d\n",
                         ret);
@@ -421,18 +418,17 @@ int mei_hbm_cl_notify_req(struct mei_device *dev,
                           struct mei_cl *cl, u8 start)
 {
 
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_notification_request *req;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_notification_request req;
         const size_t len = sizeof(struct hbm_notification_request);
         int ret;
 
-        mei_hbm_hdr(mei_hdr, len);
-        mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, dev->wr_msg.data, len);
+        mei_hbm_hdr(&mei_hdr, len);
+        mei_hbm_cl_hdr(cl, MEI_HBM_NOTIFY_REQ_CMD, &req, len);
 
-        req = (struct hbm_notification_request *)dev->wr_msg.data;
-        req->start = start;
+        req.start = start;
 
-        ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        ret = mei_write_message(dev, &mei_hdr, &req);
         if (ret)
                 dev_err(dev->dev, "notify request failed: ret = %d\n", ret);
 
@@ -534,8 +530,8 @@ static void mei_hbm_cl_notify(struct mei_device *dev,
  */
 static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_props_request *prop_req;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_props_request prop_req;
         const size_t len = sizeof(struct hbm_props_request);
         unsigned long addr;
         int ret;
@@ -550,15 +546,14 @@ static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
                 return 0;
         }
 
-        mei_hbm_hdr(mei_hdr, len);
-        prop_req = (struct hbm_props_request *)dev->wr_msg.data;
+        mei_hbm_hdr(&mei_hdr, len);
 
-        memset(prop_req, 0, sizeof(struct hbm_props_request));
+        memset(&prop_req, 0, sizeof(struct hbm_props_request));
 
-        prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
-        prop_req->me_addr = addr;
+        prop_req.hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD;
+        prop_req.me_addr = addr;
 
-        ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        ret = mei_write_message(dev, &mei_hdr, &prop_req);
         if (ret) {
                 dev_err(dev->dev, "properties request write failed: ret = %d\n",
                         ret);
@@ -581,21 +576,20 @@ static int mei_hbm_prop_req(struct mei_device *dev, unsigned long start_idx)
  */
 int mei_hbm_pg(struct mei_device *dev, u8 pg_cmd)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_power_gate *req;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_power_gate req;
         const size_t len = sizeof(struct hbm_power_gate);
         int ret;
 
         if (!dev->hbm_f_pg_supported)
                 return -EOPNOTSUPP;
 
-        mei_hbm_hdr(mei_hdr, len);
+        mei_hbm_hdr(&mei_hdr, len);
 
-        req = (struct hbm_power_gate *)dev->wr_msg.data;
-        memset(req, 0, len);
-        req->hbm_cmd = pg_cmd;
+        memset(&req, 0, len);
+        req.hbm_cmd = pg_cmd;
 
-        ret = mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        ret = mei_write_message(dev, &mei_hdr, &req);
         if (ret)
                 dev_err(dev->dev, "power gate command write failed.\n");
         return ret;
@@ -611,18 +605,17 @@ EXPORT_SYMBOL_GPL(mei_hbm_pg);
  */
 static int mei_hbm_stop_req(struct mei_device *dev)
 {
-        struct mei_msg_hdr *mei_hdr = &dev->wr_msg.hdr;
-        struct hbm_host_stop_request *req =
-                        (struct hbm_host_stop_request *)dev->wr_msg.data;
+        struct mei_msg_hdr mei_hdr;
+        struct hbm_host_stop_request req;
         const size_t len = sizeof(struct hbm_host_stop_request);
 
-        mei_hbm_hdr(mei_hdr, len);
+        mei_hbm_hdr(&mei_hdr, len);
 
-        memset(req, 0, len);
-        req->hbm_cmd = HOST_STOP_REQ_CMD;
-        req->reason = DRIVER_STOP_REQUEST;
+        memset(&req, 0, len);
+        req.hbm_cmd = HOST_STOP_REQ_CMD;
+        req.reason = DRIVER_STOP_REQUEST;
 
-        return mei_write_message(dev, mei_hdr, dev->wr_msg.data);
+        return mei_write_message(dev, &mei_hdr, &req);
 }
 
 /**
@@ -636,9 +629,10 @@ static int mei_hbm_stop_req(struct mei_device *dev)
 int mei_hbm_cl_flow_control_req(struct mei_device *dev, struct mei_cl *cl)
 {
         const size_t len = sizeof(struct hbm_flow_control);
+        u8 buf[len];
 
         cl_dbg(dev, cl, "sending flow control\n");
-        return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD, len);
+        return mei_hbm_cl_write(dev, cl, MEI_FLOW_CONTROL_CMD, buf, len);
 }
 
 /**
@@ -714,8 +708,9 @@ static void mei_hbm_cl_flow_control_res(struct mei_device *dev,
 int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 {
         const size_t len = sizeof(struct hbm_client_connect_request);
+        u8 buf[len];
 
-        return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD, len);
+        return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_REQ_CMD, buf, len);
 }
 
 /**
@@ -729,8 +724,9 @@ int mei_hbm_cl_disconnect_req(struct mei_device *dev, struct mei_cl *cl)
 int mei_hbm_cl_disconnect_rsp(struct mei_device *dev, struct mei_cl *cl)
 {
         const size_t len = sizeof(struct hbm_client_connect_response);
+        u8 buf[len];
 
-        return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD, len);
+        return mei_hbm_cl_write(dev, cl, CLIENT_DISCONNECT_RES_CMD, buf, len);
 }
 
 /**
@@ -765,8 +761,9 @@ static void mei_hbm_cl_disconnect_res(struct mei_device *dev, struct mei_cl *cl,
 int mei_hbm_cl_connect_req(struct mei_device *dev, struct mei_cl *cl)
 {
         const size_t len = sizeof(struct hbm_client_connect_request);
+        u8 buf[len];
 
-        return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD, len);
+        return mei_hbm_cl_write(dev, cl, CLIENT_CONNECT_REQ_CMD, buf, len);
 }
 
 /**
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index c9e01021eadf..e5e32503d4bc 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -382,7 +382,6 @@ const char *mei_pg_state_str(enum mei_pg_state state);
  *
  * @hbuf_depth  : depth of hardware host/write buffer is slots
  * @hbuf_is_ready : query if the host host/write buffer is ready
- * @wr_msg      : the buffer for hbm control messages
  *
  * @version     : HBM protocol version in use
  * @hbm_f_pg_supported  : hbm feature pgi protocol
@@ -467,12 +466,6 @@ struct mei_device {
         u8 hbuf_depth;
         bool hbuf_is_ready;
 
-        /* used for control messages */
-        struct {
-                struct mei_msg_hdr hdr;
-                unsigned char data[128];
-        } wr_msg;
-
         struct hbm_version version;
         unsigned int hbm_f_pg_supported:1;
         unsigned int hbm_f_dc_supported:1;
@@ -670,8 +663,7 @@ static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
 }
 
 static inline int mei_write_message(struct mei_device *dev,
-                        struct mei_msg_hdr *hdr,
-                        unsigned char *buf)
+                        struct mei_msg_hdr *hdr, void *buf)
 {
         return dev->ops->write(dev, hdr, buf);
 }