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Message-ID: <20250925203554.482371-5-cristian.marussi@arm.com>
Date: Thu, 25 Sep 2025 21:35:48 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
arm-scmi@...r.kernel.org
Cc: sudeep.holla@....com,
james.quinlan@...adcom.com,
f.fainelli@...il.com,
vincent.guittot@...aro.org,
etienne.carriere@...com,
peng.fan@....nxp.com,
michal.simek@....com,
quic_sibis@...cinc.com,
dan.carpenter@...aro.org,
d-gole@...com,
souvik.chakravarty@....com,
Cristian Marussi <cristian.marussi@....com>
Subject: [PATCH 04/10] uapi: Add ARM SCMI definitions
Add a number of structures and ioctls definitions used by the ARM
SCMI Telemetry protocol.
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
MAINTAINERS | 1 +
include/uapi/linux/scmi.h | 286 ++++++++++++++++++++++++++++++++++++++
2 files changed, 287 insertions(+)
create mode 100644 include/uapi/linux/scmi.h
diff --git a/MAINTAINERS b/MAINTAINERS
index f6206963efbf..5c10e096e638 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -24552,6 +24552,7 @@ F: drivers/regulator/scmi-regulator.c
F: drivers/reset/reset-scmi.c
F: include/linux/sc[mp]i_protocol.h
F: include/trace/events/scmi.h
+F: include/uapi/linux/scmi.h
F: include/uapi/linux/virtio_scmi.h
SYSTEM CONTROL MANAGEMENT INTERFACE (SCMI) i.MX Extension Message Protocol drivers
diff --git a/include/uapi/linux/scmi.h b/include/uapi/linux/scmi.h
new file mode 100644
index 000000000000..b1a6d34fee4a
--- /dev/null
+++ b/include/uapi/linux/scmi.h
@@ -0,0 +1,286 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2025 ARM Ltd.
+ */
+#ifndef _UAPI_LINUX_SCMI_H
+#define _UAPI_LINUX_SCMI_H
+
+/*
+ * Userspace interface SCMI Telemetry
+ */
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define SCMI_TLM_DE_IMPL_MAX_DWORDS 4
+
+#define SCMI_TLM_GRP_INVALID 0xFFFFFFFF
+
+/**
+ * scmi_tlm_base_info - Basic info about an instance
+ *
+ * @version: SCMI Telemetry protocol version
+ * @de_impl_version: SCMI Telemetry DE implementation revision
+ * @num_de: Number of defined DEs
+ * @num_groups Number of defined DEs groups
+ * @num_intervals: Number of update intervals available (instance-level)
+ * @flags: Instance specific feature-support bitmap
+ *
+ * Used by:
+ * RO - SCMI_TLM_GET_INFO
+ *
+ * Supported by:
+ * control/
+ */
+struct scmi_tlm_base_info {
+ __u32 version;
+ __u32 de_impl_version[SCMI_TLM_DE_IMPL_MAX_DWORDS];
+ __u32 num_des;
+ __u32 num_groups;
+ __u32 num_intervals;
+ __u32 flags;
+#define SCMI_TLM_CAN_RESET (1 << 0)
+///TODO more flags
+};
+
+/**
+ * scmi_tlm_config - Whole instance or group configuration
+ *
+ * @enable: Enable/Disable Telemetry for the whole instance or the group
+ * @t_enable: Enable/Disable timestamping for all the DEs belonging to a group.
+ * @current_update_interval: Get/Set currently active update interval for the
+ * whole instance or a group.
+ *
+ * Used by:
+ * RO - SCMI_TLM_GET_CFG
+ * WO - SCMI_TLM_SET_CFG
+ *
+ * Supported by:
+ * control/
+ * groups/<N>/control
+ */
+struct scmi_tlm_config {
+ __u8 enable;
+ __u8 t_enable;
+ __u8 reserved[2];
+ __u32 current_update_interval;
+};
+
+/**
+ * scmi_tlm_intervals - Update intervals descriptor
+ *
+ * @discrete: Flag to indicate the nature of the intervals described in
+ * @update_intervals.
+ * When 'false' @update_intervals is a triplet: min/max/step
+ * @num: Number of entries of @available
+ * @update_intervals: A variably-sized array containing the update intervals
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_INTRVS
+ *
+ * Supported by:
+ * control/
+ * groups/<N>/control
+ */
+struct scmi_tlm_intervals {
+ __u8 discrete;
+ __u8 reserved[3];
+ __u32 num;
+#define SCMI_TLM_UPDATE_INTVL_SEGMENT_LOW 0
+#define SCMI_TLM_UPDATE_INTVL_SEGMENT_HIGH 1
+#define SCMI_TLM_UPDATE_INTVL_SEGMENT_STEP 2
+ __u32 update_intervals[];
+};
+
+/**
+ * scmi_tlm_de_config - DE configuration
+ *
+ * @id: Identifier of the DE to act upon (ignored by SCMI_TLM_SET_ALL_CFG)
+ * @enable: A boolean to enable/disable the DE
+ * @t_enable: A boolean to enable/disable the timestamp for this DE
+ * (if supported)
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_DE_CFG
+ * RW - SCMI_TLM_SET_DE_CFG
+ * WO - SCMI_TLM_SET_ALL_CFG
+ *
+ * Supported by:
+ * control/
+ */
+struct scmi_tlm_de_config {
+ __u32 id;
+ __u32 enable;
+ __u32 t_enable;
+};
+
+/**
+ * scmi_tlm_de_info - DE Descriptor
+ *
+ * @id: DE identifier
+ * @grp_id: Identifier of the group which this DE belongs to; reported as
+ * SCMI_TLM_GRP_INVALID when not part of any group
+ * @data_sz: DE data size in bytes
+ * @type: DE type
+ * @unit: DE unit of measurements
+ * @unit_exp: Power-of-10 multiplier for DE unit
+ * @tstamp_exp: Power-of-10 multiplier for DE timestamp (if supported)
+ * @instance_id: DE instance ID
+ * @compo_instance_id: DE component instance ID
+ * @compo_type: Type of component which is associated to this DE
+ * @peristent: Data value for this DE survives reboot (non-cold ones)
+ * @name: Optional name of this DE
+ *
+ * Used to get the full description of a DE: it reflects DE Descriptors
+ * definitions in 3.12.4.6.
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_DE_INFO
+ *
+ * Supported by:
+ * control/
+ */
+struct scmi_tlm_de_info {
+ __u32 id;
+ __u32 grp_id;
+ __u32 data_sz;
+ __u32 type;
+ __u32 unit;
+ __s32 unit_exp;
+ __s32 tstamp_exp;
+ __u32 instance_id;
+ __u32 compo_instance_id;
+ __u32 compo_type;
+ __u32 persistent;
+ __u8 name[16];
+};
+
+/**
+ * scmi_tlm_des_list - List of all defined DEs
+ *
+ * @num_des: Number of entries in @des
+ * @des: An array containing descriptors for all defined DEs
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_DE_LIST
+ *
+ * Supported by:
+ * control/
+ */
+struct scmi_tlm_des_list {
+ __u32 num_des;
+ struct scmi_tlm_de_info des[];
+};
+
+/**
+ * scmi_tlm_de_sample - A DE reading
+ *
+ * @id: DE identifier
+ * @tstamp: DE reading timestamp (equal 0 is NOT supported)
+ * @val: Reading of the DE data value
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_DE_VALUE
+ *
+ * Supported by:
+ * control/
+ */
+struct scmi_tlm_de_sample {
+ __u32 id;
+ __u64 tstamp;
+ __u64 val;
+};
+
+/**
+ * scmi_tlm_data_read - Bulk read of multiple DEs
+ *
+ * @num_samples: Number of entries returned in @samples
+ * @samples: An array of samples containing an entry for each DE that was
+ * enabled when the single sample read request was issued.
+ *
+ * Used by:
+ * RW - SCMI_TLM_SINGLE_SAMPLE
+ * RW - SCMI_TLM_BULK_READ
+ *
+ * Supported by:
+ * control/
+ * groups/<N>/control
+ */
+struct scmi_tlm_data_read {
+ __u32 num_samples;
+ struct scmi_tlm_de_sample samples[];
+};
+
+/**
+ * scmi_tlm_grp_info - DE-group descriptor
+ *
+ * @id: Group ID number
+ * @num_des: Number of DEs part of this group
+ * @num_intervals: Number of update intervals supported. Zero if group does not
+ * support per-group update interval configuration.
+ *
+ * Used by:
+ * RO - SCMI_TLM_GET_GRP_INFO
+ *
+ * Supported by:
+ * groups/<N>control/
+ */
+struct scmi_tlm_grp_info {
+ __u32 id;
+ __u32 num_des;
+ __u32 num_intervals;
+};
+
+/**
+ * scmi_tlm_grps_list - DE-groups List
+ *
+ * @num_grps: Number of entries returned in @grps
+ * @grps: An array containing descriptors for all defined DE Groups
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_GRP_LIST
+ *
+ * Supported by:
+ * control/
+ */
+struct scmi_tlm_grps_list {
+ __u32 num_grps;
+ struct scmi_tlm_grp_info grps[];
+};
+
+/**
+ * scmi_tlm_grp_desc - Group descriptor
+ *
+ * @num_des: Number of DEs part of this group
+ * @composing_des: An array containing the DE IDs that belongs to this group.
+ *
+ * Used by:
+ * RW - SCMI_TLM_GET_GRP_DESC
+ *
+ * Supported by:
+ * groups/<N>control/
+ */
+struct scmi_tlm_grp_desc {
+ __u32 num_des;
+ __u32 composing_des[];
+};
+
+#define SCMI 0xF1
+
+#define SCMI_TLM_GET_INFO _IOR(SCMI, 0x00, struct scmi_tlm_base_info)
+#define SCMI_TLM_GET_CFG _IOR(SCMI, 0x01, struct scmi_tlm_config)
+#define SCMI_TLM_SET_CFG _IOW(SCMI, 0x02, struct scmi_tlm_config)
+#define SCMI_TLM_GET_INTRVS _IOWR(SCMI, 0x03, struct scmi_tlm_intervals)
+#define SCMI_TLM_GET_DE_CFG _IOWR(SCMI, 0x04, struct scmi_tlm_de_config)
+#define SCMI_TLM_SET_DE_CFG _IOWR(SCMI, 0x05, struct scmi_tlm_de_config)
+#define SCMI_TLM_GET_DE_INFO _IOWR(SCMI, 0x06, struct scmi_tlm_de_info)
+#define SCMI_TLM_GET_DE_LIST _IOWR(SCMI, 0x07, struct scmi_tlm_des_list)
+#define SCMI_TLM_GET_DE_VALUE _IOWR(SCMI, 0x08, struct scmi_tlm_de_sample)
+#define SCMI_TLM_SET_ALL_CFG _IOW(SCMI, 0x09, struct scmi_tlm_de_config)
+#define SCMI_TLM_GET_GRP_LIST _IOWR(SCMI, 0x0A, struct scmi_tlm_grps_list)
+#define SCMI_TLM_GET_GRP_INFO _IOR(SCMI, 0x0B, struct scmi_tlm_grp_info)
+#define SCMI_TLM_GET_GRP_DESC _IOWR(SCMI, 0x0C, struct scmi_tlm_grp_desc)
+#define SCMI_TLM_SINGLE_SAMPLE _IOWR(SCMI, 0x0D, struct scmi_tlm_data_read)
+#define SCMI_TLM_BULK_READ _IOWR(SCMI, 0x0E, struct scmi_tlm_data_read)
+
+#endif /* _UAPI_LINUX_SCMI_H */
--
2.51.0
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