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mei: revamp client connection

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Simplify connect state machine by changing the logic around
Connection request in progress - only check if we have a callback in
relevant queue.
Extract common code into mei_cl_send_connect() function

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2015-05-04 09:43:53 +03:00 committed by Greg Kroah-Hartman
parent 3c66618295
commit 0c53357ca4
4 changed files with 83 additions and 66 deletions
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6
drivers/misc/mei/bus.c
View File

@ -436,6 +436,12 @@ int mei_cl_enable_device(struct mei_cl_device *device)
mutex_lock(&dev->device_lock);
if (mei_cl_is_connected(cl)) {
mutex_unlock(&dev->device_lock);
dev_warn(dev->dev, "Already connected");
return -EBUSY;
}
err = mei_cl_connect(cl, NULL);
if (err < 0) {
mutex_unlock(&dev->device_lock);

97
drivers/misc/mei/client.c
View File

@ -881,27 +881,82 @@ out:
*
* Return: true if other client is connected, false - otherwise.
*/
bool mei_cl_is_other_connecting(struct mei_cl *cl)
static bool mei_cl_is_other_connecting(struct mei_cl *cl)
{
struct mei_device *dev;
struct mei_cl *ocl; /* the other client */
if (WARN_ON(!cl || !cl->dev))
return false;
struct mei_cl_cb *cb;
dev = cl->dev;
list_for_each_entry(ocl, &dev->file_list, link) {
if (ocl->state == MEI_FILE_CONNECTING &&
ocl != cl &&
cl->me_client_id == ocl->me_client_id)
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)
return true;
}
return false;
}
/**
* mei_cl_send_connect - send connect request
*
* @cl: host client
* @cb: callback block
*
* Return: 0, OK; otherwise, error.
*/
static int mei_cl_send_connect(struct mei_cl *cl, struct mei_cl_cb *cb)
{
struct mei_device *dev;
int ret;
dev = cl->dev;
ret = mei_hbm_cl_connect_req(dev, cl);
cl->status = ret;
if (ret) {
cl->state = MEI_FILE_DISCONNECT_REPLY;
return ret;
}
list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
cl->timer_count = MEI_CONNECT_TIMEOUT;
return 0;
}
/**
* mei_cl_irq_connect - send connect request in irq_thread context
*
* @cl: host client
* @cb: callback block
* @cmpl_list: complete list
*
* Return: 0, OK; otherwise, error.
*/
int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
struct mei_cl_cb *cmpl_list)
{
struct mei_device *dev = cl->dev;
u32 msg_slots;
int slots;
int rets;
msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
slots = mei_hbuf_empty_slots(dev);
if (mei_cl_is_other_connecting(cl))
return 0;
if (slots < msg_slots)
return -EMSGSIZE;
rets = mei_cl_send_connect(cl, cb);
if (rets)
list_move_tail(&cb->list, &cmpl_list->list);
return rets;
}
/**
* mei_cl_connect - connect host client to the me one
*
@ -935,18 +990,14 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
if (rets)
goto out;
cl->state = MEI_FILE_CONNECTING;
list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
/* run hbuf acquire last so we don't have to undo */
if (!mei_cl_is_other_connecting(cl) && mei_hbuf_acquire(dev)) {
cl->state = MEI_FILE_CONNECTING;
if (mei_hbm_cl_connect_req(dev, cl)) {
rets = -ENODEV;
rets = mei_cl_send_connect(cl, cb);
if (rets)
goto out;
}
cl->timer_count = MEI_CONNECT_TIMEOUT;
list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
} else {
cl->state = MEI_FILE_INITIALIZING;
list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
}
mutex_unlock(&dev->device_lock);
@ -957,20 +1008,22 @@ int mei_cl_connect(struct mei_cl *cl, struct file *file)
mutex_lock(&dev->device_lock);
if (!mei_cl_is_connected(cl)) {
/* something went really wrong */
/* timeout or something went really wrong */
if (!cl->status)
cl->status = -EFAULT;
mei_cl_set_disconnected(cl);
}
rets = cl->status;
out:
cl_dbg(dev, cl, "rpm: autosuspend\n");
pm_runtime_mark_last_busy(dev->dev);
pm_runtime_put_autosuspend(dev->dev);
mei_io_cb_free(cb);
if (!mei_cl_is_connected(cl))
mei_cl_set_disconnected(cl);
return rets;
}

3
drivers/misc/mei/client.h
View File

@ -103,12 +103,13 @@ static inline bool mei_cl_is_connected(struct mei_cl *cl)
return cl->state == MEI_FILE_CONNECTED;
}
bool mei_cl_is_other_connecting(struct mei_cl *cl);
int mei_cl_disconnect(struct mei_cl *cl);
void mei_cl_set_disconnected(struct mei_cl *cl);
int mei_cl_irq_disconnect(struct mei_cl *cl, struct mei_cl_cb *cb,
struct mei_cl_cb *cmpl_list);
int mei_cl_connect(struct mei_cl *cl, struct file *file);
int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
struct mei_cl_cb *cmpl_list);
int mei_cl_read_start(struct mei_cl *cl, size_t length, struct file *fp);
int mei_cl_irq_read_msg(struct mei_cl *cl, struct mei_msg_hdr *hdr,
struct mei_cl_cb *cmpl_list);

43
drivers/misc/mei/interrupt.c
View File

@ -223,49 +223,6 @@ static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
return 0;
}
/**
* mei_cl_irq_connect - send connect request in irq_thread context
*
* @cl: client
* @cb: callback block.
* @cmpl_list: complete list.
*
* Return: 0, OK; otherwise, error.
*/
static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
struct mei_cl_cb *cmpl_list)
{
struct mei_device *dev = cl->dev;
u32 msg_slots;
int slots;
int ret;
msg_slots = mei_data2slots(sizeof(struct hbm_client_connect_request));
slots = mei_hbuf_empty_slots(dev);
if (mei_cl_is_other_connecting(cl))
return 0;
if (slots < msg_slots)
return -EMSGSIZE;
cl->state = MEI_FILE_CONNECTING;
ret = mei_hbm_cl_connect_req(dev, cl);
if (ret) {
cl->status = ret;
cb->buf_idx = 0;
list_del_init(&cb->list);
return ret;
}
list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
cl->timer_count = MEI_CONNECT_TIMEOUT;
return 0;
}
/**
* mei_irq_read_handler - bottom half read routine after ISR to
* handle the read processing.