Messages in this thread Patch in this message | | | From | Cristian Marussi <> | Subject | [RFC PATCH 07/11] firmware: arm_scmi: Add Power notifications support | Date | Mon, 20 Jan 2020 12:23:29 +0000 |
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Make SCMI Power protocol register with the notification core.
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> --- drivers/firmware/arm_scmi/power.c | 155 +++++++++++++++++++++++++++++- include/linux/scmi_protocol.h | 26 +++++ 2 files changed, 180 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c index cf7f0312381b..024d6a375710 100644 --- a/drivers/firmware/arm_scmi/power.c +++ b/drivers/firmware/arm_scmi/power.c @@ -6,6 +6,7 @@ */ #include "common.h" +#include "notify.h" enum scmi_power_protocol_cmd { POWER_DOMAIN_ATTRIBUTES = 0x3, @@ -48,6 +49,12 @@ struct scmi_power_state_notify { __le32 notify_enable; }; +struct scmi_power_state_notify_payld { + __le32 agent_id; + __le32 domain_id; + __le32 power_state; +}; + struct power_dom_info { bool state_set_sync; bool state_set_async; @@ -61,6 +68,14 @@ struct scmi_power_info { u64 stats_addr; u32 stats_size; struct power_dom_info *dom_info; + const struct scmi_handle *handle; +}; + +static struct scmi_power_info *pinfo; + +static enum scmi_power_protocol_cmd evt_2_cmd[] = { + POWER_STATE_NOTIFY, + POWER_STATE_CHANGE_REQUESTED_NOTIFY, }; static int scmi_power_attributes_get(const struct scmi_handle *handle, @@ -186,11 +201,130 @@ static struct scmi_power_ops power_ops = { .state_get = scmi_power_state_get, }; +static int scmi_power_request_notify(const struct scmi_handle *handle, + u32 domain, int message_id, bool enable) +{ + int ret; + struct scmi_xfer *t; + struct scmi_power_state_notify *notify; + + ret = scmi_xfer_get_init(handle, message_id, SCMI_PROTOCOL_POWER, + sizeof(*notify), 0, &t); + if (ret) + return ret; + + notify = t->tx.buf; + notify->domain = cpu_to_le32(domain); + notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0; + + ret = scmi_do_xfer(handle, t); + + scmi_xfer_put(handle, t); + return ret; +} + +static bool scmi_power_set_notify_enabled(u8 evt_id, const u32 *src_id, + bool enable) +{ + int ret, cmd_id; + + cmd_id = MAP_EVT_TO_ENABLE_CMD(evt_id, evt_2_cmd); + if (cmd_id < 0) + return false; + + if (src_id) { + ret = scmi_power_request_notify(pinfo->handle, *src_id, + cmd_id, enable); + if (ret) + pr_warn("Failed enabling SCMI Notifications - Power - evt[%X] dom[%d] - ret:%d\n", + evt_id, *src_id, ret); + } else { + int r, dom; + + ret = 1; + for (dom = 0; dom < pinfo->num_domains; dom++) { + r = scmi_power_request_notify(pinfo->handle, dom, + cmd_id, enable); + if (r) + pr_warn("Failed enabling SCMI Notifications - Power - evt[%X] dom[%d] - ret:%d\n", + evt_id, dom, r); + ret *= r; + } + } + + return !ret ? true : false; +} + +static void *scmi_power_fill_custom_report(u8 evt_id, u64 timestamp, + const void *payld, size_t payld_sz, + void *report, u32 *src_id) +{ + void *rep = NULL; + + switch (evt_id) { + case POWER_STATE_CHANGED: + { + const struct scmi_power_state_notify_payld *p = payld; + struct scmi_power_state_changed_report *r = report; + + if (sizeof(*p) != payld_sz) + break; + + r->timestamp = timestamp; + r->agent_id = le32_to_cpu(p->agent_id); + r->domain_id = le32_to_cpu(p->domain_id); + r->power_state = le32_to_cpu(p->power_state); + *src_id = r->domain_id; + rep = r; + break; + } + case POWER_STATE_CHANGE_REQUESTED: + { + const struct scmi_power_state_notify_payld *p = payld; + struct scmi_power_state_change_requested_report *r = report; + + if (sizeof(*p) != payld_sz) + break; + + r->timestamp = timestamp; + r->agent_id = le32_to_cpu(p->agent_id); + r->domain_id = le32_to_cpu(p->domain_id); + r->power_state = le32_to_cpu(p->power_state); + *src_id = r->domain_id; + rep = r; + break; + } + default: + break; + } + + return rep; +} + +static const struct scmi_event power_events[] = { + { + .evt_id = POWER_STATE_CHANGED, + .max_payld_sz = 12, + .max_report_sz = + sizeof(struct scmi_power_state_changed_report), + }, + { + .evt_id = POWER_STATE_CHANGE_REQUESTED, + .max_payld_sz = 12, + .max_report_sz = + sizeof(struct scmi_power_state_change_requested_report), + }, +}; + +static const struct scmi_protocol_event_ops power_event_ops = { + .set_notify_enabled = scmi_power_set_notify_enabled, + .fill_custom_report = scmi_power_fill_custom_report, +}; + static int scmi_power_protocol_init(struct scmi_handle *handle) { int domain; u32 version; - struct scmi_power_info *pinfo; scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version); @@ -214,7 +348,12 @@ static int scmi_power_protocol_init(struct scmi_handle *handle) scmi_power_domain_attributes_get(handle, domain, dom); } + scmi_register_protocol_events(SCMI_PROTOCOL_POWER, PAGE_SIZE, + &power_event_ops, power_events, + ARRAY_SIZE(power_events)); + pinfo->version = version; + pinfo->handle = handle; handle->power_ops = &power_ops; handle->power_priv = pinfo; @@ -227,3 +366,17 @@ static int __init scmi_power_init(void) &scmi_power_protocol_init); } subsys_initcall(scmi_power_init); + +int scmi_register_power_event_notifier(u8 evt_id, u32 *dom_id, + struct notifier_block *nb) +{ + return scmi_register_event_notifier(SCMI_PROTOCOL_POWER, evt_id, + dom_id, nb); +} + +int scmi_unregister_power_event_notifier(u8 evt_id, u32 *dom_id, + struct notifier_block *nb) +{ + return scmi_unregister_event_notifier(SCMI_PROTOCOL_POWER, evt_id, + dom_id, nb); +} diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index 5c873a59b387..61bdfe0bebe2 100644 --- a/include/linux/scmi_protocol.h +++ b/include/linux/scmi_protocol.h @@ -4,8 +4,13 @@ * * Copyright (C) 2018 ARM Ltd. */ +#ifndef _LINUX_SCMI_PROTOCOL_H +#define _LINUX_SCMI_PROTOCOL_H + #include <linux/device.h> #include <linux/types.h> +#include <linux/notifier.h> +#include <linux/ktime.h> #define SCMI_MAX_STR_SIZE 16 #define SCMI_MAX_NUM_RATES 16 @@ -319,3 +324,24 @@ static inline void scmi_driver_unregister(struct scmi_driver *driver) {} typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *); int scmi_protocol_register(int protocol_id, scmi_prot_init_fn_t fn); void scmi_protocol_unregister(int protocol_id); + +struct scmi_power_state_changed_report { + ktime_t timestamp; + u32 agent_id; + u32 domain_id; + u32 power_state; +}; + +struct scmi_power_state_change_requested_report { + ktime_t timestamp; + u32 agent_id; + u32 domain_id; + u32 power_state; +}; + +int scmi_register_power_event_notifier(u8 evt_id, u32 *dom_id, + struct notifier_block *nb); +int scmi_unregister_power_event_notifier(u8 evt_id, u32 *dom_id, + struct notifier_block *nb); + +#endif /* _LINUX_SCMI_PROTOCOL_H */ -- 2.17.1
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