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authorSrinivas Kandagatla <srinivas.kandagatla@linaro.org>2018-06-19 17:12:59 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-07 17:24:32 +0200
commitd3062a21093093bc77a8ebf1b555e380993993e7 (patch)
tree0b8b49c88c015368df96ff1158b45d8a85eef458 /drivers/slimbus
parentdb455d66b9900a8a81fe474f11c78c8c8a95eefa (diff)
downloadlinux-d3062a21093093bc77a8ebf1b555e380993993e7.tar.bz2
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>
Diffstat (limited to 'drivers/slimbus')
-rw-r--r--drivers/slimbus/messaging.c74
-rw-r--r--drivers/slimbus/slimbus.h2
2 files changed, 54 insertions, 22 deletions
diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c
index e3605ed1c459..d5879142dbef 100644
--- a/drivers/slimbus/messaging.c
+++ b/drivers/slimbus/messaging.c
@@ -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);
@@ -56,6 +53,48 @@ 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
*
* @ctrl: Controller handle
@@ -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);
}
}
diff --git a/drivers/slimbus/slimbus.h b/drivers/slimbus/slimbus.h
index 79f8e05d92dd..2ba6545fa716 100644
--- a/drivers/slimbus/slimbus.h
+++ b/drivers/slimbus/slimbus.h
@@ -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)
{