On 7/9/24 23:22, Cristian Marussi wrote:
On Wed, Jul 03, 2024 at 12:44:38AM +0530, Sibi Sankar wrote:
The ARM SCMI QCOM vendor protocol provides a generic way of exposing a
number of Qualcomm SoC specific features (like memory bus scaling) through
a mixture of pre-determined algorithm strings and param_id pairs hosted on
the SCMI controller.
Hi Sibi,
Co-developed-by: Shivnandan Kumar <quic_kshivnan@xxxxxxxxxxx>
Signed-off-by: Shivnandan Kumar <quic_kshivnan@xxxxxxxxxxx>
Co-developed-by: Ramakrishna Gottimukkula <quic_rgottimu@xxxxxxxxxxx>
Signed-off-by: Ramakrishna Gottimukkula <quic_rgottimu@xxxxxxxxxxx>
Co-developed-by: Amir Vajid <avajid@xxxxxxxxxxx>
Signed-off-by: Amir Vajid <avajid@xxxxxxxxxxx>
Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---
drivers/firmware/arm_scmi/vendors/Kconfig | 12 ++
drivers/firmware/arm_scmi/vendors/Makefile | 2 +-
.../arm_scmi/vendors/qcom_scmi_vendor.c | 184 ++++++++++++++++++
include/linux/qcom_scmi_vendor.h | 39 ++++
4 files changed, 236 insertions(+), 1 deletion(-)
create mode 100644 drivers/firmware/arm_scmi/vendors/qcom_scmi_vendor.c
create mode 100644 include/linux/qcom_scmi_vendor.h
diff --git a/drivers/firmware/arm_scmi/vendors/Kconfig b/drivers/firmware/arm_scmi/vendors/Kconfig
index 7c1ca7a12603..6bff4550fa25 100644
--- a/drivers/firmware/arm_scmi/vendors/Kconfig
+++ b/drivers/firmware/arm_scmi/vendors/Kconfig
@@ -1,4 +1,16 @@
# SPDX-License-Identifier: GPL-2.0-only
menu "ARM SCMI Vendor Protocols"
+config ARM_SCMI_PROTOCOL_VENDOR_QCOM
+ tristate "Qualcomm Technologies, Inc. Qcom SCMI vendor Protocol"
+ depends on ARM_SCMI_PROTOCOL || COMPILE_TEST
+ help
+ The SCMI QCOM vendor protocol provides a generic way of exposing a
+ number of Qualcomm SoC specific features (like memory bus scaling)
+ through a mixture of pre-determined algorithm strings and param_id
+ pairs hosted on the SCMI controller.
+
+ This driver defines/documents the message ID's used for this
+ communication and also exposes the ops used by the clients.
operations
+
endmenu
diff --git a/drivers/firmware/arm_scmi/vendors/Makefile b/drivers/firmware/arm_scmi/vendors/Makefile
index c6c214158dd8..c1d6a355f579 100644
--- a/drivers/firmware/arm_scmi/vendors/Makefile
[...]
+++ b/drivers/firmware/arm_scmi/vendors/Makefile
+ if (ret)
+ return ret;
+
+ msg = t->tx.buf;
+ msg->algo_low = cpu_to_le32(lower_32_bits(algo_str));
+ msg->algo_high = cpu_to_le32(upper_32_bits(algo_str));
+ msg->param_id = cpu_to_le32(param_id);
+
+ memcpy(msg->buf, buf, t->tx.len - sizeof(*msg));
+
+ ret = ph->xops->do_xfer(ph, t);
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static int qcom_scmi_get_param(const struct scmi_protocol_handle *ph, void *buf, u64 algo_str,
+ u32 param_id, size_t tx_size, size_t rx_size)
+{
Similarly...and looking at my past ramblings...this rx_size is the expected RX
size AND also the size of the provided *buf too, right ?
+ struct scmi_xfer *t;
+ struct qcom_scmi_msg *msg;
+ int ret;
+
+ ret = ph->xops->xfer_get_init(ph, QCOM_SCMI_GET_PARAM, tx_size + sizeof(*msg), rx_size, &t);
+ if (ret)
+ return ret;
+
+ msg = t->tx.buf;
+ msg->algo_low = cpu_to_le32(lower_32_bits(algo_str));
+ msg->algo_high = cpu_to_le32(upper_32_bits(algo_str));
+ msg->param_id = cpu_to_le32(param_id);
+ memcpy(msg->buf, buf, t->tx.len - sizeof(*msg));
+
+ ret = ph->xops->do_xfer(ph, t);
+ memcpy(buf, t->rx.buf, t->rx.len);
...so that this memcpy is safe since rx.len is equal to rx_size by construction
(if I read correctly my past review/mublings...)
...in that case maybe, for better clarity you could re-name the rx_size
param as buf_len and have it following *buf in the param list...
...sorry for not having spotted this naming/order niptick earlier ...
the only caveat being rx_size can be lower than the tx_size
and we dont't want to copy more that what we expect. Addressed
all your other comments from the series in V4. Sry it took a
while due to its dependency with scmi perf changes. Thanks
again.
-Sibi
[...]
Thanks,
Cristian
