Document the various memory buses that can be monitored and scaled by the
memory latency governor hosted by the ARM SCMI QCOM Vendor protocol v1.0.
Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
---
Adding a reg property in scmi-memlat.yaml seems incorrect/superfluous
but without it I see the following errors:
Err Logs:
protocol@80: 'reg' does not match any of the regexes: '^memory-[0-9]$', 'pinctrl-[0-9]+'
protocol@80: Unevaluated properties are not allowed ('memory-0', 'memory-1', 'memory-2' were unexpected)
v2:
* Drop container dvfs memlat container node. [Rob]
* Move scmi-memlat.yaml to protocol level given that a lot of vendors might end up
using the same protocol number. [Rob]
* Replace qcom,cpulist with the standard "cpus" property. [Rob]
* Fix up compute-type/ipm-ceil required. [Rob]
.../bindings/firmware/arm,scmi.yaml | 15 ++
.../bindings/soc/qcom/qcom,scmi-memlat.yaml | 242 ++++++++++++++++++
include/dt-bindings/soc/qcom,scmi-vendor.h | 22 ++
3 files changed, 279 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,scmi-memlat.yaml
create mode 100644 include/dt-bindings/soc/qcom,scmi-vendor.h
diff --git a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
index 4d823f3b1f0e..a4022682e5ca 100644
--- a/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
+++ b/Documentation/devicetree/bindings/firmware/arm,scmi.yaml
@@ -284,6 +284,21 @@ properties:
required:
- reg
+ protocol@80:
+ type: object
+ allOf:
+ - $ref: '#/$defs/protocol-node'
+ - $ref: /schemas/soc/qcom/qcom,scmi-memlat.yaml#
+
+ unevaluatedProperties: false
+
+ properties:
+ reg:
+ const: 0x80
+
+ required:
+ - reg
+
additionalProperties: false
$defs:
diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,scmi-memlat.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,scmi-memlat.yaml
new file mode 100644
index 000000000000..915a6bf5697f
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,scmi-memlat.yaml
@@ -0,0 +1,242 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/qcom/qcom,scmi-memlat.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm SCMI Memory Bus nodes
+
+maintainers:
+ - Sibi Sankar <quic_sibis@xxxxxxxxxxx>
+
+description:
+ This binding describes the various memory buses that can be monitored and scaled
+ by memory latency governor running on the CPU Control Processor (SCMI controller).
+
+properties:
+ reg:
+ maxItems: 1
+
+patternProperties:
+ '^memory-[0-9]$':
+ type: object
+ description:
+ The list of all memory buses that can be monitored and scaled by the
+ memory latency governor running on the SCMI controller.
+
+ unevaluatedProperties: false
+
+ properties:
+ qcom,memory-type:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2]
+ description: |
+ Memory Bus Identifier
+ 0 = QCOM_MEM_TYPE_DDR
+ 1 = QCOM_MEM_TYPE_LLCC
+ 2 = QCOM_MEM_TYPE_DDR_QOS
+
+ freq-table-hz:
+ items:
+ items:
+ - description: Minimum frequency of the memory bus in Hz
+ - description: Maximum frequency of the memory bus in Hz
+
+ patternProperties:
+ '^monitor-[0-9]$':
+ type: object
+ unevaluatedProperties: false
+ description:
+ The list of all monitors detecting the memory latency bound workloads using
+ various counters.
+
+ properties:
+ qcom,compute-type:
+ description:
+ Monitors of type compute perform bus dvfs based on a rudimentary CPU
+ frequency to memory frequency map.
+ type: boolean
+
+ qcom,ipm-ceil:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Monitors having this property perform bus dvfs based on the same
+ rudimentary table but the scaling is performed only if the calculated
+ IPM (Instruction Per Misses) exceeds the given ceiling.
+
+ cpus:
+ $ref: /schemas/types.yaml#/definitions/phandle-array
+ description:
+ Should be a list of phandles to CPU nodes (as described in
+ Documentation/devicetree/bindings/arm/cpus.yaml).
+
+ operating-points-v2: true
+ opp-table:
+ type: object
+
+ required:
+ - cpus
+ - operating-points-v2
+
+ oneOf:
+ - required: [ 'qcom,compute-type' ]
+ - required: [ 'qcom,ipm-ceil' ]
+
+ required:
+ - qcom,memory-type
+ - freq-table-hz
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/soc/qcom,scmi-vendor.h>
+
+ firmware {
+ scmi {
+ compatible = "arm,scmi";
+ mboxes = <&cpucp_mbox 0>, <&cpucp_mbox 2>;
+ mbox-names = "tx", "rx";
+ shmem = <&cpu_scp_lpri0>, <&cpu_scp_lpri1>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ protocol@80 {
+ reg = <0x80>;
+
+ memory-0 {
+ qcom,memory-type = <QCOM_MEM_TYPE_DDR>;
+ freq-table-hz = /bits/ 64 <200000000 4224000000>;
+
+ monitor-0 {
+ qcom,ipm-ceil = <20000000>;
+ cpus = <&CPU0 &CPU1 &CPU2 &CPU3 &CPU4 &CPU5 &CPU6 &CPU7
+ &CPU8 &CPU9 &CPU10 &CPU11>;
+ operating-points-v2 = <&memory0_monitor0_opp_table>;
+
+ memory0_monitor0_opp_table: opp-table {
+ compatible = "operating-points-v2";
+
+ opp-999000000 {
+ opp-hz = /bits/ 64 <999000000 547000000>;
+ };
+
+ opp-1440000000 {
+ opp-hz = /bits/ 64 <1440000000 768000000>;
+ };
+
+ opp-1671000000 {
+ opp-hz = /bits/ 64 <1671000000 1555000000>;
+ };
+
+ opp-2189000000 {
+ opp-hz = /bits/ 64 <2189000000 2092000000>;
+ };
+
+ opp-2516000000 {
+ opp-hz = /bits/ 64 <2516000000 3187000000>;
+ };
+
+ opp-3860000000 {
+ opp-hz = /bits/ 64 <3860000000 4224000000>;
+ };
+ };
+ };
+
+ monitor-1 {
+ qcom,compute-type;
+ cpus = <&CPU0 &CPU1 &CPU2 &CPU3 &CPU4 &CPU5 &CPU6 &CPU7
+ &CPU8 &CPU9 &CPU10 &CPU11>;
+ operating-points-v2 = <&memory0_monitor1_opp_table>;
+
+ memory0_monitor1_opp_table: opp-table {
+ compatible = "operating-points-v2";
+
+ opp-1440000000 {
+ opp-hz = /bits/ 64 <1440000000 200000000>;
+ };
+
+ opp-2189000000 {
+ opp-hz = /bits/ 64 <2189000000 768000000>;
+ };
+
+ opp-2516000000 {
+ opp-hz = /bits/ 64 <2516000000 1555000000>;
+ };
+
+ opp-3860000000 {
+ opp-hz = /bits/ 64 <3860000000 4224000000>;
+ };
+ };
+ };
+ };
+
+ memory-1 {
+ qcom,memory-type = <QCOM_MEM_TYPE_LLCC>;
+ freq-table-hz = /bits/ 64 <300000000 1067000000>;
+
+ monitor-0 {
+ qcom,ipm-ceil = <20000000>;
+ cpus = <&CPU0 &CPU1 &CPU2 &CPU3 &CPU4 &CPU5 &CPU6 &CPU7
+ &CPU8 &CPU9 &CPU10 &CPU11>;
+ operating-points-v2 = <&memory1_monitor0_opp_table>;
+
+ memory1_monitor0_opp_table: opp-table {
+ compatible = "operating-points-v2";
+
+ opp-999000000 {
+ opp-hz = /bits/ 64 <999000000 300000000>;
+ };
+
+ opp-1440000000 {
+ opp-hz = /bits/ 64 <1440000000 466000000>;
+ };
+
+ opp-1671000000 {
+ opp-hz = /bits/ 64 <1671000000 600000000>;
+ };
+
+ opp-2189000000 {
+ opp-hz = /bits/ 64 <2189000000 806000000>;
+ };
+
+ opp-2516000000 {
+ opp-hz = /bits/ 64 <2516000000 933000000>;
+ };
+
+ opp-3860000000 {
+ opp-hz = /bits/ 64 <3860000000 1066000000>;
+ };
+ };
+ };
+ };
+
+ memory-2 {
+ qcom,memory-type = <QCOM_MEM_TYPE_DDR_QOS>;
+ freq-table-hz = /bits/ 64 <QCOM_DDR_LEVEL_AUTO QCOM_DDR_LEVEL_PERF>;
+
+ monitor-0 {
+ qcom,ipm-ceil = <20000000>;
+ cpus = <&CPU0 &CPU1 &CPU2 &CPU3 &CPU4 &CPU5 &CPU6 &CPU7
+ &CPU8 &CPU9 &CPU10 &CPU11>;
+ operating-points-v2 = <&memory2_monitor0_opp_table>;
+
+ memory2_monitor0_opp_table: opp-table {
+ compatible = "operating-points-v2";
+
+ opp-2189000000 {
+ opp-hz = /bits/ 64 <2189000000>;
+ opp-level = <QCOM_DDR_LEVEL_AUTO>;
+ };
+
+ opp-3860000000 {
+ opp-hz = /bits/ 64 <3860000000>;
+ opp-level = <QCOM_DDR_LEVEL_PERF>;
+ };
+ };
+ };
+ };
+ };
+ };
+ };
diff --git a/include/dt-bindings/soc/qcom,scmi-vendor.h b/include/dt-bindings/soc/qcom,scmi-vendor.h
new file mode 100644
index 000000000000..7ae8d8d5623b
--- /dev/null
+++ b/include/dt-bindings/soc/qcom,scmi-vendor.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+/*
+ * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+#ifndef __DT_BINDINGS_QCOM_SCMI_VENDOR_H
+#define __DT_BINDINGS_QCOM_SCMI_VENDOR
+
+/* Memory IDs */
+#define QCOM_MEM_TYPE_DDR 0x0
+#define QCOM_MEM_TYPE_LLCC 0x1
+#define QCOM_MEM_TYPE_DDR_QOS 0x2
+
+/*
+ * QCOM_MEM_TYPE_DDR_QOS supports the following states.
+ *
+ * %QCOM_DDR_LEVEL_AUTO: DDR operates with LPM enabled
+ * %QCOM_DDR_LEVEL_PERF: DDR operates with LPM disabled
+ */
+#define QCOM_DDR_LEVEL_AUTO 0x0
+#define QCOM_DDR_LEVEL_PERF 0x1
+
+#endif /* __DT_BINDINGS_QCOM_SCMI_VENDOR_H */
--
2.34.1
