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| author | Igor Skalkin <igor.skalkin@opensynergy.com> | 2021-08-03 14:10:19 +0100 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2021-08-05 10:23:23 +0100 |
| commit | c92c3e382ebd2382b26a41e312a266a40c4fb05c (patch) | |
| tree | a3bb88ac8bcecf0ad212941d7a1e806ced050fdb /drivers/firmware/arm_scmi/common.h | |
| parent | a7b1138b921dc19f859296b2eb3daa7c5e22c354 (diff) | |
| download | linux-stable-c92c3e382ebd2382b26a41e312a266a40c4fb05c.tar.gz linux-stable-c92c3e382ebd2382b26a41e312a266a40c4fb05c.tar.bz2 linux-stable-c92c3e382ebd2382b26a41e312a266a40c4fb05c.zip | |
firmware: arm_scmi: Add method to override max message number
The maximum number of simultaneously pending messages is a transport
specific quantity that is usually described statically in struct scmi_desc.
Some transports, though, can calculate such number only at run-time after
some initial transport specific setup and probing is completed; moreover
the resulting max message numbers could also be different between rx and
tx channels.
Add an optional get_max_msg() operation so that a transport can report more
accurate max message numbers for each channel type.
The value in scmi_desc.max_msg is still used as default when transport does
not provide any get_max_msg() method.
Link: https://lore.kernel.org/r/20210803131024.40280-11-cristian.marussi@arm.com
Co-developed-by: Peter Hilber <peter.hilber@opensynergy.com>
Co-developed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Igor Skalkin <igor.skalkin@opensynergy.com>
[ Peter: Adapted patch for submission to upstream. ]
Signed-off-by: Peter Hilber <peter.hilber@opensynergy.com>
[ Cristian: refactored how get_max_msg() is used to minimize core changes ]
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware/arm_scmi/common.h')
| -rw-r--r-- | drivers/firmware/arm_scmi/common.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 204cde53a9a7..6320345865e8 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -351,6 +351,9 @@ 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 @@ -363,6 +366,7 @@ 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); @@ -390,8 +394,9 @@ struct scmi_device *scmi_child_dev_find(struct device *parent, * de-initialization, so 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. */ struct scmi_desc { |