[PATCH v4 02/12] firmware: arm_scmi: Add configurable polling mode for transports

[Cristian Marussi <cristian.marussi@arm.com>]

SCMI communications along TX channels can optionally be provided of a
completion interrupt; when such interrupt is not available, command
transactions should rely on polling, where the SCMI core takes care to
repeatedly evaluate the transport-specific .poll_done() function to
determine if and when a request was fully completed or timed out.

Such mechanism is already present and working on a single transfer base:
SCMI protocols can indeed enable hdr.poll_completion on specific commands
ahead of each transfer and cause that transaction to be handled with
polling.

Introduce a couple of flags to be able to enforce such polling behaviour
globally at will:

 - scmi_desc.force_polling: to statically switch the whole transport to
   polling mode.

 - scmi_chan_info.no_completion_irq: to switch a single channel dynamically
   to polling mode if at runtime is determined that no completion interrupt
   was available for such channel.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
v3 --> v4:
- renamed .needs_polling flag to .no_completion_irq
- refactored error path when polling needed but not supported
---
 drivers/firmware/arm_scmi/common.h | 11 +++++++++++
 drivers/firmware/arm_scmi/driver.c | 29 +++++++++++++++++++++++------
 2 files changed, 34 insertions(+), 6 deletions(-)

diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index dea1bfbe1052..67c761141a48 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -339,11 +339,19 @@ void scmi_protocol_release(const struct scmi_handle *handle, u8 protocol_id);
  * @dev: Reference to device in the SCMI hierarchy corresponding to this
  *	 channel
  * @handle: Pointer to SCMI entity handle
+ * @no_completion_irq: Flag to indicate that this channel has no completion
+ *		       interrupt mechanism, so it needs SCMI core to poll,
+ *		       using .poll_done(), to determine when a command has
+ *		       completed.
+ *		       This can be dynamically set by transports at run-time
+ *		       inside their provided .chan_setup() when they determine
+ *		       no completion interrupt is available.
  * @transport_info: Transport layer related information
  */
 struct scmi_chan_info {
 	struct device *dev;
 	struct scmi_handle *handle;
+	bool no_completion_irq;
 	void *transport_info;
 };
 
@@ -402,6 +410,8 @@ struct scmi_device *scmi_child_dev_find(struct device *parent,
  *	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.
+ * @force_polling: Flag to force this whole transport to use SCMI core polling
+ *		   mechanism instead of completion interrupts even if available.
  */
 struct scmi_desc {
 	int (*transport_init)(void);
@@ -410,6 +420,7 @@ struct scmi_desc {
 	int max_rx_timeout_ms;
 	int max_msg;
 	int max_msg_size;
+	bool force_polling;
 };
 
 #ifdef CONFIG_ARM_SCMI_TRANSPORT_MAILBOX
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 01c79a8fa77f..a3700f49e8ac 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -656,6 +656,15 @@ static void scmi_handle_response(struct scmi_chan_info *cinfo,
 		return;
 	}
 
+	/* Discard unexpected messages when polling is active. */
+	if (xfer->hdr.type != MSG_TYPE_DELAYED_RESP &&
+	    xfer->hdr.poll_completion) {
+		WARN_ON_ONCE(1);
+		dev_dbg(cinfo->dev,
+			"Completion IRQ received but using polling. Ignore.\n");
+		return;
+	}
+
 	/* rx.len could be shrunk in the sync do_xfer, so reset to maxsz */
 	if (xfer->hdr.type == MSG_TYPE_DELAYED_RESP)
 		xfer->rx.len = info->desc->max_msg_size;
@@ -760,16 +769,19 @@ static int do_xfer(const struct scmi_protocol_handle *ph,
 	struct device *dev = info->dev;
 	struct scmi_chan_info *cinfo;
 
-	if (xfer->hdr.poll_completion && !info->desc->ops->poll_done) {
-		dev_warn_once(dev,
-			      "Polling mode is not supported by transport.\n");
-		return -EINVAL;
-	}
-
 	cinfo = idr_find(&info->tx_idr, pi->proto->id);
 	if (unlikely(!cinfo))
 		return -EINVAL;
 
+	if (info->desc->force_polling || cinfo->no_completion_irq) {
+		if (!info->desc->ops->poll_done) {
+			dev_warn_once(dev,
+				      "Polling mode is not supported by transport.\n");
+			return -EINVAL;
+		}
+		xfer->hdr.poll_completion = true;
+	}
+
 	/*
 	 * Initialise protocol id now from protocol handle to avoid it being
 	 * overridden by mistake (or malice) by the protocol code mangling with
@@ -1499,6 +1511,11 @@ static int scmi_chan_setup(struct scmi_info *info, struct device *dev,
 	if (ret)
 		return ret;
 
+	if (tx && (cinfo->no_completion_irq || info->desc->force_polling))
+		dev_info(dev,
+			 "Enabled polling mode for TX channel - prot_id:%d\n",
+			 prot_id);
+
 idr_alloc:
 	ret = idr_alloc(idr, cinfo, prot_id, prot_id + 1, GFP_KERNEL);
 	if (ret != prot_id) {
-- 
2.17.1