From b9794a822281944ef3de5b1812a94cbdb8134320 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Fri, 28 Jan 2022 17:35:33 +0100 Subject: powercap/drivers/dtpm: Convert the init table section to a simple array The init table section is freed after the system booted. However the next changes will make per module the DTPM description, so the table won't be accessible when the module is loaded. In order to fix that, we should move the table to the data section where there are very few entries and that makes strange to add it there. The main goal of the table was to keep self-encapsulated code and we can keep it almost as it by using an array instead. Suggested-by: Ulf Hansson Reviewed-by: Ulf Hansson Signed-off-by: Daniel Lezcano Link: https://lore.kernel.org/r/20220128163537.212248-2-daniel.lezcano@linaro.org --- include/asm-generic/vmlinux.lds.h | 11 ----------- include/linux/dtpm.h | 24 +++--------------------- 2 files changed, 3 insertions(+), 32 deletions(-) (limited to 'include') diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 42f3866bca69..2a10db2f0bc5 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -321,16 +321,6 @@ #define THERMAL_TABLE(name) #endif -#ifdef CONFIG_DTPM -#define DTPM_TABLE() \ - . = ALIGN(8); \ - __dtpm_table = .; \ - KEEP(*(__dtpm_table)) \ - __dtpm_table_end = .; -#else -#define DTPM_TABLE() -#endif - #define KERNEL_DTB() \ STRUCT_ALIGN(); \ __dtb_start = .; \ @@ -723,7 +713,6 @@ ACPI_PROBE_TABLE(irqchip) \ ACPI_PROBE_TABLE(timer) \ THERMAL_TABLE(governor) \ - DTPM_TABLE() \ EARLYCON_TABLE() \ LSM_TABLE() \ EARLY_LSM_TABLE() \ diff --git a/include/linux/dtpm.h b/include/linux/dtpm.h index d37e5d06a357..506048158a50 100644 --- a/include/linux/dtpm.h +++ b/include/linux/dtpm.h @@ -32,29 +32,11 @@ struct dtpm_ops { void (*release)(struct dtpm *); }; -typedef int (*dtpm_init_t)(void); - -struct dtpm_descr { - dtpm_init_t init; +struct dtpm_subsys_ops { + const char *name; + int (*init)(void); }; -/* Init section thermal table */ -extern struct dtpm_descr __dtpm_table[]; -extern struct dtpm_descr __dtpm_table_end[]; - -#define DTPM_TABLE_ENTRY(name, __init) \ - static struct dtpm_descr __dtpm_table_entry_##name \ - __used __section("__dtpm_table") = { \ - .init = __init, \ - } - -#define DTPM_DECLARE(name, init) DTPM_TABLE_ENTRY(name, init) - -#define for_each_dtpm_table(__dtpm) \ - for (__dtpm = __dtpm_table; \ - __dtpm < __dtpm_table_end; \ - __dtpm++) - static inline struct dtpm *to_dtpm(struct powercap_zone *zone) { return container_of(zone, struct dtpm, zone); -- cgit From 3759ec678e8944dc2ea70cab77a300408f78ae27 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Fri, 28 Jan 2022 17:35:34 +0100 Subject: powercap/drivers/dtpm: Add hierarchy creation The DTPM framework is available but without a way to configure it. This change provides a way to create a hierarchy of DTPM node where the power consumption reflects the sum of the children's power consumption. It is up to the platform to specify an array of dtpm nodes where each element has a pointer to its parent, except the top most one. The type of the node gives the indication of which initialization callback to call. At this time, we can create a virtual node, where its purpose is to be a parent in the hierarchy, and a DT node where the name describes its path. In order to ensure a nice self-encapsulation, the DTPM subsys array contains a couple of initialization functions, one to setup the DTPM backend and one to initialize it up. With this approach, the DTPM framework has a very few material to export. Signed-off-by: Daniel Lezcano Reviewed-by: Ulf Hansson Link: https://lore.kernel.org/r/20220128163537.212248-3-daniel.lezcano@linaro.org --- include/linux/dtpm.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'include') diff --git a/include/linux/dtpm.h b/include/linux/dtpm.h index 506048158a50..f7a25c70dd4c 100644 --- a/include/linux/dtpm.h +++ b/include/linux/dtpm.h @@ -32,9 +32,23 @@ struct dtpm_ops { void (*release)(struct dtpm *); }; +struct device_node; + struct dtpm_subsys_ops { const char *name; int (*init)(void); + int (*setup)(struct dtpm *, struct device_node *); +}; + +enum DTPM_NODE_TYPE { + DTPM_NODE_VIRTUAL = 0, + DTPM_NODE_DT, +}; + +struct dtpm_node { + enum DTPM_NODE_TYPE type; + const char *name; + struct dtpm_node *parent; }; static inline struct dtpm *to_dtpm(struct powercap_zone *zone) @@ -52,4 +66,5 @@ void dtpm_unregister(struct dtpm *dtpm); int dtpm_register(const char *name, struct dtpm *dtpm, struct dtpm *parent); +int dtpm_create_hierarchy(struct of_device_id *dtpm_match_table); #endif -- cgit From c404c64d64bc31bebe8a2015103671f7cd282731 Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Sun, 30 Jan 2022 22:02:06 +0100 Subject: powercap/dtpm: Destroy hierarchy function The hierarchy creation function exits but without a destroy hierarchy function. Due to that, the modules creating the hierarchy can not be unloaded properly because they don't have an exit callback. Provide the dtpm_destroy_hierarchy() function to remove the previously created hierarchy. The function relies on all the release mechanisms implemented by the underlying powercap framework. Signed-off-by: Daniel Lezcano Reviewed-by: Ulf Hansson Link: https://lore.kernel.org/r/20220130210210.549877-4-daniel.lezcano@linaro.org --- include/linux/dtpm.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include') diff --git a/include/linux/dtpm.h b/include/linux/dtpm.h index f7a25c70dd4c..a4a13514b730 100644 --- a/include/linux/dtpm.h +++ b/include/linux/dtpm.h @@ -37,6 +37,7 @@ struct device_node; struct dtpm_subsys_ops { const char *name; int (*init)(void); + void (*exit)(void); int (*setup)(struct dtpm *, struct device_node *); }; @@ -67,4 +68,6 @@ void dtpm_unregister(struct dtpm *dtpm); int dtpm_register(const char *name, struct dtpm *dtpm, struct dtpm *parent); int dtpm_create_hierarchy(struct of_device_id *dtpm_match_table); + +void dtpm_destroy_hierarchy(void); #endif -- cgit