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Subject[RFC PATCH 3/7] firmware: arm_scmi: Add op to override max message #
Date
From: Igor Skalkin <igor.skalkin@opensynergy.com>

The number of messages that the upcoming scmi-virtio transport can
support depends on the virtio device (SCMI platform) and can differ for
each channel. (The scmi-virtio transport does only have one tx and at
most 1 rx channel.)

Add an optional transport op so that scmi-virtio can report the actual
max message # for each channel type. Respect these new limits.

Co-developed-by: Peter Hilber <peter.hilber@opensynergy.com>
Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com>
Signed-off-by: Igor Skalkin <igor.skalkin@opensynergy.com>
---
drivers/firmware/arm_scmi/common.h | 8 ++++-
drivers/firmware/arm_scmi/driver.c | 49 ++++++++++++++++++++++--------
2 files changed, 43 insertions(+), 14 deletions(-)

diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index 4cc78eb27f14..0f1540cb2d84 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -201,6 +201,9 @@ 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
+ * @max_msg: 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
@@ -213,6 +216,8 @@ 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);
+ int (*get_max_msg)(bool tx, struct scmi_chan_info *base_cinfo,
+ int *max_msg);
int (*send_message)(struct scmi_chan_info *cinfo,
struct scmi_xfer *xfer);
void (*mark_txdone)(struct scmi_chan_info *cinfo, int ret);
@@ -230,7 +235,8 @@ struct scmi_transport_ops {
* @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 for a channel type (tx or rx) that can
- * be pending simultaneously in the system
+ * 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.
*/
struct scmi_desc {
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index d070687cf2f6..d66f19b27c44 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -61,11 +61,13 @@ static atomic_t transfer_last_id;
* 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
*/
struct scmi_xfers_info {
struct scmi_xfer *xfer_block;
unsigned long *xfer_alloc_table;
spinlock_t xfer_lock;
+ int max_msg;
};

/**
@@ -157,13 +159,11 @@ static struct scmi_xfer *scmi_xfer_get(const struct scmi_handle *handle,
u16 xfer_id;
struct scmi_xfer *xfer;
unsigned long flags, bit_pos;
- struct scmi_info *info = handle_to_scmi_info(handle);

/* Keep the locked section as small as possible */
spin_lock_irqsave(&minfo->xfer_lock, flags);
- bit_pos = find_first_zero_bit(minfo->xfer_alloc_table,
- info->desc->max_msg);
- if (bit_pos == info->desc->max_msg) {
+ bit_pos = find_first_zero_bit(minfo->xfer_alloc_table, minfo->max_msg);
+ if (bit_pos == minfo->max_msg) {
spin_unlock_irqrestore(&minfo->xfer_lock, flags);
return ERR_PTR(-ENOMEM);
}
@@ -594,32 +594,44 @@ int scmi_handle_put(const struct scmi_handle *handle)
}

static int __scmi_xfer_info_init(struct scmi_info *sinfo,
- struct scmi_xfers_info *info)
+ struct scmi_xfers_info *info,
+ bool tx,
+ struct scmi_chan_info *base_cinfo)
{
int i;
struct scmi_xfer *xfer;
struct device *dev = sinfo->dev;
const struct scmi_desc *desc = sinfo->desc;

+ info->max_msg = desc->max_msg;
+
+ if (desc->ops->get_max_msg) {
+ int ret =
+ desc->ops->get_max_msg(tx, base_cinfo, &info->max_msg);
+
+ if (ret)
+ return ret;
+ }
+
/* Pre-allocated messages, no more than what hdr.seq can support */
- if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) {
+ if (WARN_ON(info->max_msg >= MSG_TOKEN_MAX)) {
dev_err(dev, "Maximum message of %d exceeds supported %ld\n",
- desc->max_msg, MSG_TOKEN_MAX);
+ info->max_msg, MSG_TOKEN_MAX);
return -EINVAL;
}

- info->xfer_block = devm_kcalloc(dev, desc->max_msg,
+ info->xfer_block = devm_kcalloc(dev, info->max_msg,
sizeof(*info->xfer_block), GFP_KERNEL);
if (!info->xfer_block)
return -ENOMEM;

- info->xfer_alloc_table = devm_kcalloc(dev, BITS_TO_LONGS(desc->max_msg),
+ info->xfer_alloc_table = devm_kcalloc(dev, BITS_TO_LONGS(info->max_msg),
sizeof(long), GFP_KERNEL);
if (!info->xfer_alloc_table)
return -ENOMEM;

/* Pre-initialize the buffer pointer to pre-allocated buffers */
- for (i = 0, xfer = info->xfer_block; i < desc->max_msg; i++, xfer++) {
+ for (i = 0, xfer = info->xfer_block; i < info->max_msg; i++, xfer++) {
xfer->rx.buf = devm_kcalloc(dev, sizeof(u8), desc->max_msg_size,
GFP_KERNEL);
if (!xfer->rx.buf)
@@ -636,10 +648,21 @@ static int __scmi_xfer_info_init(struct scmi_info *sinfo,

static int scmi_xfer_info_init(struct scmi_info *sinfo)
{
- int ret = __scmi_xfer_info_init(sinfo, &sinfo->tx_minfo);
+ int ret;
+ struct scmi_chan_info *base_tx_cinfo;
+ struct scmi_chan_info *base_rx_cinfo;
+
+ base_tx_cinfo = idr_find(&sinfo->tx_idr, SCMI_PROTOCOL_BASE);
+ if (unlikely(!base_tx_cinfo))
+ return -EINVAL;
+
+ ret = __scmi_xfer_info_init(sinfo, &sinfo->tx_minfo, true,
+ base_tx_cinfo);

- if (!ret && idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE))
- ret = __scmi_xfer_info_init(sinfo, &sinfo->rx_minfo);
+ base_rx_cinfo = idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE);
+ if (!ret && base_rx_cinfo)
+ ret = __scmi_xfer_info_init(sinfo, &sinfo->rx_minfo, false,
+ base_rx_cinfo);

return ret;
}
--
2.25.1
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