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mei: bus: Synchronous API for the data transmission 

Define a truly synchronous API for the bus Tx path by putting all pending
request to the write list and wait for the interrupt tx handler to wake
us up.
The ___mei_cl_send() out path is also slightly reworked to make it look more
like main.c:mei_write().

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Samuel Ortiz 2013-03-27 17:29:58 +02:00 committed by Greg Kroah-Hartman
parent cf3baefba0
commit 44d88d9192
2 changed files with 30 additions and 10 deletions
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39
drivers/misc/mei/bus.c
View File

@ -222,7 +222,8 @@ void mei_cl_driver_unregister(struct mei_cl_driver *driver)
}
EXPORT_SYMBOL_GPL(mei_cl_driver_unregister);
int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
static int ___mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
bool blocking)
{
struct mei_device *dev;
struct mei_msg_hdr mei_hdr;
@ -273,11 +274,8 @@ int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
cb->buf_idx = 0;
mei_hdr.msg_complete = 0;
cl->writing_state = MEI_WRITING;
list_add_tail(&cb->list, &dev->write_list.list);
mutex_unlock(&dev->device_lock);
return length;
goto out;
}
dev->hbuf_is_ready = false;
@ -303,19 +301,30 @@ int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
cl->writing_state = MEI_WRITING;
cb->buf_idx = mei_hdr.length;
if (!mei_hdr.msg_complete) {
list_add_tail(&cb->list, &dev->write_list.list);
} else {
out:
if (mei_hdr.msg_complete) {
if (mei_cl_flow_ctrl_reduce(cl)) {
err = -EIO;
err = -ENODEV;
goto out_err;
}
list_add_tail(&cb->list, &dev->write_waiting_list.list);
} else {
list_add_tail(&cb->list, &dev->write_list.list);
}
mutex_unlock(&dev->device_lock);
if (blocking && cl->writing_state != MEI_WRITE_COMPLETE) {
if (wait_event_interruptible(cl->tx_wait,
cl->writing_state == MEI_WRITE_COMPLETE)) {
if (signal_pending(current))
err = -EINTR;
err = -ERESTARTSYS;
mutex_lock(&dev->device_lock);
goto out_err;
}
}
return mei_hdr.length;
out_err:
@ -382,6 +391,16 @@ out:
return r_length;
}
inline int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length)
{
return ___mei_cl_send(cl, buf, length, 0);
}
inline int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length)
{
return ___mei_cl_send(cl, buf, length, 1);
}
int mei_cl_send(struct mei_cl_device *device, u8 *buf, size_t length)
{
struct mei_cl *cl = device->cl;

1
drivers/misc/mei/mei_dev.h
View File

@ -273,6 +273,7 @@ struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
uuid_le uuid, char *name);
void mei_cl_remove_device(struct mei_cl_device *device);
int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);