@@ -214,6 +214,13 @@ struct scmi_desc {
const bool atomic_enabled;
};
+void scmi_xfer_raw_put(const struct scmi_handle *handle,
+ struct scmi_xfer *xfer);
+struct scmi_xfer *scmi_xfer_raw_get(const struct scmi_handle *handle);
+
+int scmi_xfer_raw_inflight_register(const struct scmi_handle *handle,
+ struct scmi_xfer *xfer);
+
#ifdef CONFIG_ARM_SCMI_TRANSPORT_MAILBOX
extern const struct scmi_desc scmi_mailbox_desc;
#endif
@@ -350,6 +350,53 @@ scmi_xfer_inflight_register_unlocked(struct scmi_xfer *xfer,
xfer->pending = true;
}
+/**
+ * scmi_xfer_inflight_register - Try to register an xfer as in-flight
+ *
+ * @xfer: The xfer to register
+ * @minfo: Pointer to Tx/Rx Message management info based on channel type
+ *
+ * Note that this helper does NOT assume anything about the sequence number
+ * that was baked into the provided xfer, so it checks at first if it can
+ * be mapped to a free slot and fails with an error if another xfer with the
+ * same sequence number is currently still registered as in-flight.
+ *
+ * Return: 0 on Success or -EBUSY if sequence number embedded in the xfer
+ * could not rbe mapped to a free slot in the xfer_alloc_table.
+ */
+static int scmi_xfer_inflight_register(struct scmi_xfer *xfer,
+ struct scmi_xfers_info *minfo)
+{
+ int ret = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&minfo->xfer_lock, flags);
+ if (!test_bit(xfer->hdr.seq, minfo->xfer_alloc_table))
+ scmi_xfer_inflight_register_unlocked(xfer, minfo);
+ else
+ ret = -EBUSY;
+ spin_unlock_irqrestore(&minfo->xfer_lock, flags);
+
+ return ret;
+}
+
+/**
+ * scmi_xfer_raw_inflight_register - An helper to register the given xfer as in
+ * flight on the TX channe, if possible.
+ *
+ * @handle: Pointer to SCMI entity handle
+ * @xfer: The xfer to register
+ *
+ * Return: 0 on Success, error otherwise
+ */
+int scmi_xfer_raw_inflight_register(const struct scmi_handle *handle,
+ struct scmi_xfer *xfer)
+{
+ struct scmi_info *info = handle_to_scmi_info(handle);
+
+ return scmi_xfer_inflight_register(xfer, &info->tx_minfo);
+}
+
/**
* scmi_xfer_pending_set - Pick a proper sequence number and mark the xfer
* as pending in-flight
@@ -425,6 +472,22 @@ static struct scmi_xfer *scmi_xfer_get(const struct scmi_handle *handle,
return xfer;
}
+/**
+ * scmi_xfer_raw_get - Helper to get a bare free xfer from the TX channel
+ *
+ * @handle: Pointer to SCMI entity handle
+ *
+ * Note that xfer is taken from the TX channel structures.
+ *
+ * Return: A valid xfer on Success, or an error-pointer otherwise
+ */
+struct scmi_xfer *scmi_xfer_raw_get(const struct scmi_handle *handle)
+{
+ struct scmi_info *info = handle_to_scmi_info(handle);
+
+ return scmi_xfer_get(handle, &info->tx_minfo);
+}
+
/**
* __scmi_xfer_put() - Release a message
*
@@ -453,6 +516,22 @@ __scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer)
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
}
+/**
+ * scmi_xfer_raw_put - Release an xfer that was taken by @scmi_xfer_raw_get
+ *
+ * @handle: Pointer to SCMI entity handle
+ * @xfer: A reference to the xfer to put
+ *
+ * Note that as with other xfer_put() handlers the xfer is really effectively
+ * released only if there are no more users on the system.
+ */
+void scmi_xfer_raw_put(const struct scmi_handle *handle, struct scmi_xfer *xfer)
+{
+ struct scmi_info *info = handle_to_scmi_info(handle);
+
+ return __scmi_xfer_put(&info->tx_minfo, xfer);
+}
+
/**
* scmi_xfer_lookup_unlocked - Helper to lookup an xfer_id
*
Add a few SCMI helpers useful to implement SCMI Raw access support. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> --- drivers/firmware/arm_scmi/common.h | 7 +++ drivers/firmware/arm_scmi/driver.c | 79 ++++++++++++++++++++++++++++++ 2 files changed, 86 insertions(+)