@@ -334,6 +334,9 @@ struct scmi_chan_info {
* @chan_available: Callback to check if channel is available or not
* @chan_setup: Callback to allocate and setup a channel
* @chan_free: Callback to free a channel
+ * @get_max_msg: Optional callback to provide max_msg dynamically
+ * Returns the maximum number of messages for the channel type
+ * (tx or rx) that can be pending simultaneously in the system
* @send_message: Callback to send a message
* @mark_txdone: Callback to mark tx as done
* @fetch_response: Callback to fetch response
@@ -346,6 +349,7 @@ struct scmi_transport_ops {
int (*chan_setup)(struct scmi_chan_info *cinfo, struct device *dev,
bool tx);
int (*chan_free)(int id, void *p, void *data);
+ unsigned int (*get_max_msg)(struct scmi_chan_info *base_cinfo);
int (*send_message)(struct scmi_chan_info *cinfo,
struct scmi_xfer *xfer);
void (*mark_txdone)(struct scmi_chan_info *cinfo, int ret);
@@ -373,8 +377,9 @@ struct scmi_device *scmi_child_dev_find(struct device *parent,
* after SCMI core removal.
* @ops: Pointer to the transport specific ops structure
* @max_rx_timeout_ms: Timeout for communication with SoC (in Milliseconds)
- * @max_msg: Maximum number of messages that can be pending
- * simultaneously in the system
+ * @max_msg: Maximum number of messages for a channel type (tx or rx) that can
+ * be pending simultaneously in the system. May be overridden by the
+ * get_max_msg op.
* @max_msg_size: Maximum size of data per message that can be handled.
* @using_xfers_delegation: A flag to indicate if the described transport will
* handle delegated xfers, so the core can derive
@@ -75,6 +75,7 @@ struct scmi_requested_dev {
* Index of this bitmap table is also used for message
* sequence identifier.
* @xfer_lock: Protection for message allocation
+ * @max_msg: Maximum number of messages that can be pending
* @last_token: A counter to use as base to generate for monotonically
* increasing tokens.
* @free_xfers: A free list for available to use xfers. It is initialized with
@@ -86,6 +87,7 @@ struct scmi_requested_dev {
struct scmi_xfers_info {
unsigned long *xfer_alloc_table;
spinlock_t xfer_lock;
+ int max_msg;
atomic_t last_token;
struct hlist_head free_xfers;
DECLARE_HASHTABLE(pending_xfers, SCMI_PENDING_XFERS_HT_ORDER_SZ);
@@ -1523,10 +1525,10 @@ static int __scmi_xfer_info_init(struct scmi_info *sinfo,
const struct scmi_desc *desc = sinfo->desc;
/* Pre-allocated messages, no more than what hdr.seq can support */
- if (WARN_ON(!desc->max_msg || desc->max_msg > MSG_TOKEN_MAX)) {
+ if (WARN_ON(!info->max_msg || info->max_msg > MSG_TOKEN_MAX)) {
dev_err(dev,
"Invalid max_msg %d. Maximum messages supported %lu.\n",
- desc->max_msg, MSG_TOKEN_MAX);
+ info->max_msg, MSG_TOKEN_MAX);
return -EINVAL;
}
@@ -1544,7 +1546,7 @@ static int __scmi_xfer_info_init(struct scmi_info *sinfo,
* attach all of them to the free list
*/
INIT_HLIST_HEAD(&info->free_xfers);
- for (i = 0; i < desc->max_msg; i++) {
+ for (i = 0; i < info->max_msg; i++) {
xfer = devm_kzalloc(dev, sizeof(*xfer), GFP_KERNEL);
if (!xfer)
return -ENOMEM;
@@ -1568,10 +1570,40 @@ static int __scmi_xfer_info_init(struct scmi_info *sinfo,
return 0;
}
+static int scmi_channels_max_msg_configure(struct scmi_info *sinfo)
+{
+ const struct scmi_desc *desc = sinfo->desc;
+
+ if (!desc->ops->get_max_msg) {
+ sinfo->tx_minfo.max_msg = desc->max_msg;
+ sinfo->rx_minfo.max_msg = desc->max_msg;
+ } else {
+ struct scmi_chan_info *base_cinfo;
+
+ base_cinfo = idr_find(&sinfo->tx_idr, SCMI_PROTOCOL_BASE);
+ if (!base_cinfo)
+ return -EINVAL;
+ sinfo->tx_minfo.max_msg = desc->ops->get_max_msg(base_cinfo);
+
+ /* RX channel is optional so can be skipped */
+ base_cinfo = idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE);
+ if (base_cinfo)
+ sinfo->rx_minfo.max_msg =
+ desc->ops->get_max_msg(base_cinfo);
+ }
+
+ return 0;
+}
+
static int scmi_xfer_info_init(struct scmi_info *sinfo)
{
- int ret = __scmi_xfer_info_init(sinfo, &sinfo->tx_minfo);
+ int ret;
+
+ ret = scmi_channels_max_msg_configure(sinfo);
+ if (ret)
+ return ret;
+ ret = __scmi_xfer_info_init(sinfo, &sinfo->tx_minfo);
if (!ret && idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE))
ret = __scmi_xfer_info_init(sinfo, &sinfo->rx_minfo);