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slimbus: messaging: add slim_alloc/free_txn_tid() 

This patch adds slim_alloc_txn_tid() and slim_free_txn_tid() api
to allow controllers like ngd to allocate tids for user specific
commands. This also cleans up the existing code to use single place
for tid allocations and free.

This patch also make the tid allocation cyclic one, its very useful
to track the transactions back during debug.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Srinivas Kandagatla 2018-06-19 17:12:59 +01:00 committed by Greg Kroah-Hartman
parent db455d66b9
commit d3062a2109
2 changed files with 54 additions and 22 deletions
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74
drivers/slimbus/messaging.c
View File

@ -29,22 +29,19 @@ void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len)
spin_lock_irqsave(&ctrl->txn_lock, flags);
txn = idr_find(&ctrl->tid_idr, tid);
if (txn == NULL) {
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
if (txn == NULL)
return;
}
msg = txn->msg;
if (msg == NULL || msg->rbuf == NULL) {
dev_err(ctrl->dev, "Got response to invalid TID:%d, len:%d\n",
tid, len);
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
return;
}
idr_remove(&ctrl->tid_idr, tid);
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
slim_free_txn_tid(ctrl, txn);
memcpy(msg->rbuf, reply, len);
if (txn->comp)
complete(txn->comp);
@ -55,6 +52,48 @@ void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len)
}
EXPORT_SYMBOL_GPL(slim_msg_response);
/**
* slim_alloc_txn_tid() - Allocate a tid to txn
*
* @ctrl: Controller handle
* @txn: transaction to be allocated with tid.
*
* Return: zero on success with valid txn->tid and error code on failures.
*/
int slim_alloc_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&ctrl->txn_lock, flags);
ret = idr_alloc_cyclic(&ctrl->tid_idr, txn, 0,
SLIM_MAX_TIDS, GFP_ATOMIC);
if (ret < 0) {
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
return ret;
}
txn->tid = ret;
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(slim_alloc_txn_tid);
/**
* slim_free_txn_tid() - Freee tid of txn
*
* @ctrl: Controller handle
* @txn: transaction whose tid should be freed
*/
void slim_free_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn)
{
unsigned long flags;
spin_lock_irqsave(&ctrl->txn_lock, flags);
idr_remove(&ctrl->tid_idr, txn->tid);
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
}
EXPORT_SYMBOL_GPL(slim_free_txn_tid);
/**
* slim_do_transfer() - Process a SLIMbus-messaging transaction
*
@ -72,8 +111,7 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
{
DECLARE_COMPLETION_ONSTACK(done);
bool need_tid = false, clk_pause_msg = false;
unsigned long flags;
int ret, tid, timeout;
int ret, timeout;
/*
* do not vote for runtime-PM if the transactions are part of clock
@ -97,34 +135,26 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
need_tid = slim_tid_txn(txn->mt, txn->mc);
if (need_tid) {
spin_lock_irqsave(&ctrl->txn_lock, flags);
tid = idr_alloc(&ctrl->tid_idr, txn, 0,
SLIM_MAX_TIDS, GFP_ATOMIC);
txn->tid = tid;
ret = slim_alloc_txn_tid(ctrl, txn);
if (ret)
return ret;
if (!txn->msg->comp)
txn->comp = &done;
else
txn->comp = txn->comp;
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
if (tid < 0)
return tid;
}
ret = ctrl->xfer_msg(ctrl, txn);
if (ret && need_tid && !txn->msg->comp) {
if (!ret && need_tid && !txn->msg->comp) {
unsigned long ms = txn->rl + HZ;
timeout = wait_for_completion_timeout(txn->comp,
msecs_to_jiffies(ms));
if (!timeout) {
ret = -ETIMEDOUT;
spin_lock_irqsave(&ctrl->txn_lock, flags);
idr_remove(&ctrl->tid_idr, tid);
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
slim_free_txn_tid(ctrl, txn);
}
}

2
drivers/slimbus/slimbus.h
View File

@ -240,6 +240,8 @@ int slim_unregister_controller(struct slim_controller *ctrl);
void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 l);
int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn);
int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart);
int slim_alloc_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn);
void slim_free_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn);
static inline bool slim_tid_txn(u8 mt, u8 mc)
{