From: Ulf Hansson <ulf.hansson@linaro.org> To: Sudeep Holla <sudeep.holla@arm.com>, Cristian Marussi <cristian.marussi@arm.com>, Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>, Stephen Boyd <sboyd@kernel.org> Cc: Nikunj Kela <nkela@quicinc.com>, Prasad Sodagudi <psodagud@quicinc.com>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Ulf Hansson <ulf.hansson@linaro.org>, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 10/16] firmware: arm_scmi: Add the SCMI performance domain Date: Wed, 7 Jun 2023 14:46:22 +0200 [thread overview] Message-ID: <20230607124628.157465-11-ulf.hansson@linaro.org> (raw) In-Reply-To: <20230607124628.157465-1-ulf.hansson@linaro.org> To enable support for performance scaling (DVFS) for generic devices with the SCMI performance protocol, let's add an SCMI performance domain. This is being modelled as a genpd provider, with support for performance scaling through genpd's ->set_performance_state() callback. Note that, this adds the initial support that allows consumer drivers for attached devices, to vote for a new performance state via calling the dev_pm_genpd_set_performance_state(). However, this should be avoided as it's in most cases preferred to use the OPP library to vote for a new OPP instead. The support using the OPP library is implemented from subsequent changes. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/firmware/arm_scmi/Kconfig | 12 ++ drivers/firmware/arm_scmi/Makefile | 1 + drivers/firmware/arm_scmi/scmi_perf_domain.c | 155 +++++++++++++++++++ 3 files changed, 168 insertions(+) create mode 100644 drivers/firmware/arm_scmi/scmi_perf_domain.c diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig index ea0f5083ac47..706d1264d038 100644 --- a/drivers/firmware/arm_scmi/Kconfig +++ b/drivers/firmware/arm_scmi/Kconfig @@ -181,6 +181,18 @@ config ARM_SCMI_POWER_DOMAIN will be called scmi_pm_domain. Note this may needed early in boot before rootfs may be available. +config ARM_SCMI_PERF_DOMAIN + tristate "SCMI performance domain driver" + depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) + default y + select PM_GENERIC_DOMAINS if PM + help + This enables support for the SCMI performance domains which can be + enabled or disabled via the SCP firmware. + + This driver can also be built as a module. If so, the module will be + called scmi_perf_domain. + config ARM_SCMI_POWER_CONTROL tristate "SCMI system power control driver" depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index b31d78fa66cc..afee66a65dcb 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-module.o obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o +obj-$(CONFIG_ARM_SCMI_PERF_DOMAIN) += scmi_perf_domain.o obj-$(CONFIG_ARM_SCMI_POWER_CONTROL) += scmi_power_control.o ifeq ($(CONFIG_THUMB2_KERNEL)$(CONFIG_CC_IS_CLANG),yy) diff --git a/drivers/firmware/arm_scmi/scmi_perf_domain.c b/drivers/firmware/arm_scmi/scmi_perf_domain.c new file mode 100644 index 000000000000..9be90a7d94de --- /dev/null +++ b/drivers/firmware/arm_scmi/scmi_perf_domain.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCMI performance domain support. + * + * Copyright (C) 2023 Linaro Ltd. + */ + +#include <linux/err.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/pm_domain.h> +#include <linux/scmi_protocol.h> +#include <linux/slab.h> + +struct scmi_perf_domain { + struct generic_pm_domain genpd; + const struct scmi_perf_proto_ops *perf_ops; + const struct scmi_protocol_handle *ph; + u32 domain_id; + bool can_level_set; +}; + +#define to_scmi_pd(pd) container_of(pd, struct scmi_perf_domain, genpd) + +static int +scmi_pd_set_perf_state(struct generic_pm_domain *genpd, unsigned int state) +{ + struct scmi_perf_domain *pd = to_scmi_pd(genpd); + int ret; + + if (!pd->can_level_set) + return 0; + + ret = pd->perf_ops->level_set(pd->ph, pd->domain_id, state, true); + if (ret) + dev_warn(&genpd->dev, "Failed with %d when trying to set %d perf level", + ret, state); + + return ret; +} + +static int scmi_perf_domain_probe(struct scmi_device *sdev) +{ + struct device *dev = &sdev->dev; + const struct scmi_handle *handle = sdev->handle; + const struct scmi_perf_proto_ops *perf_ops; + struct scmi_protocol_handle *ph; + struct scmi_perf_domain *scmi_pd; + struct genpd_onecell_data *scmi_pd_data; + struct generic_pm_domain **domains; + int num_domains, i, ret = 0; + u32 perf_level; + + if (!handle) + return -ENODEV; + + /* The OF node must specify us as a power-domain provider. */ + if (!of_find_property(dev->of_node, "#power-domain-cells", NULL)) + return 0; + + perf_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PERF, &ph); + if (IS_ERR(perf_ops)) + return PTR_ERR(perf_ops); + + num_domains = perf_ops->num_domains_get(ph); + if (num_domains < 0) { + dev_warn(dev, "Failed with %d when getting num perf domains\n", + num_domains); + return num_domains; + } else if (!num_domains) { + return 0; + } + + scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL); + if (!scmi_pd) + return -ENOMEM; + + scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL); + if (!scmi_pd_data) + return -ENOMEM; + + domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL); + if (!domains) + return -ENOMEM; + + for (i = 0; i < num_domains; i++, scmi_pd++) { + scmi_pd->domain_id = i; + scmi_pd->perf_ops = perf_ops; + scmi_pd->ph = ph; + scmi_pd->can_level_set = perf_ops->can_level_set(ph, i); + + scmi_pd->genpd.name = perf_ops->name_get(ph, i); + scmi_pd->genpd.flags = GENPD_FLAG_OPP_TABLE_FW; + scmi_pd->genpd.set_performance_state = scmi_pd_set_perf_state; + + ret = perf_ops->level_get(ph, i, &perf_level, false); + if (ret) { + dev_dbg(dev, "Failed to get perf level for %s", + scmi_pd->genpd.name); + perf_level = 0; + } + + /* Let the perf level indicate the power-state too. */ + ret = pm_genpd_init(&scmi_pd->genpd, NULL, perf_level == 0); + if (ret) + goto err; + + domains[i] = &scmi_pd->genpd; + } + + scmi_pd_data->domains = domains; + scmi_pd_data->num_domains = num_domains; + + ret = of_genpd_add_provider_onecell(dev->of_node, scmi_pd_data); + if (ret) + goto err; + + dev_set_drvdata(dev, scmi_pd_data); + dev_info(dev, "Initialized %d performance domains", num_domains); + return 0; +err: + for (i--; i >= 0; i--) + pm_genpd_remove(domains[i]); + return ret; +} + +static void scmi_perf_domain_remove(struct scmi_device *sdev) +{ + struct device *dev = &sdev->dev; + struct genpd_onecell_data *scmi_pd_data = dev_get_drvdata(dev); + int i; + + of_genpd_del_provider(dev->of_node); + + for (i = 0; i < scmi_pd_data->num_domains; i++) + pm_genpd_remove(scmi_pd_data->domains[i]); +} + +static const struct scmi_device_id scmi_id_table[] = { + { SCMI_PROTOCOL_PERF, "perf" }, + { }, +}; +MODULE_DEVICE_TABLE(scmi, scmi_id_table); + +static struct scmi_driver scmi_perf_domain_driver = { + .name = "scmi-perf-domain", + .probe = scmi_perf_domain_probe, + .remove = scmi_perf_domain_remove, + .id_table = scmi_id_table, +}; +module_scmi_driver(scmi_perf_domain_driver); + +MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org>"); +MODULE_DESCRIPTION("ARM SCMI perf domain driver"); +MODULE_LICENSE("GPL v2"); -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: Ulf Hansson <ulf.hansson@linaro.org> To: Sudeep Holla <sudeep.holla@arm.com>, Cristian Marussi <cristian.marussi@arm.com>, Viresh Kumar <vireshk@kernel.org>, Nishanth Menon <nm@ti.com>, Stephen Boyd <sboyd@kernel.org> Cc: Nikunj Kela <nkela@quicinc.com>, Prasad Sodagudi <psodagud@quicinc.com>, Alexandre Torgue <alexandre.torgue@foss.st.com>, Ulf Hansson <ulf.hansson@linaro.org>, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 10/16] firmware: arm_scmi: Add the SCMI performance domain Date: Wed, 7 Jun 2023 14:46:22 +0200 [thread overview] Message-ID: <20230607124628.157465-11-ulf.hansson@linaro.org> (raw) In-Reply-To: <20230607124628.157465-1-ulf.hansson@linaro.org> To enable support for performance scaling (DVFS) for generic devices with the SCMI performance protocol, let's add an SCMI performance domain. This is being modelled as a genpd provider, with support for performance scaling through genpd's ->set_performance_state() callback. Note that, this adds the initial support that allows consumer drivers for attached devices, to vote for a new performance state via calling the dev_pm_genpd_set_performance_state(). However, this should be avoided as it's in most cases preferred to use the OPP library to vote for a new OPP instead. The support using the OPP library is implemented from subsequent changes. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/firmware/arm_scmi/Kconfig | 12 ++ drivers/firmware/arm_scmi/Makefile | 1 + drivers/firmware/arm_scmi/scmi_perf_domain.c | 155 +++++++++++++++++++ 3 files changed, 168 insertions(+) create mode 100644 drivers/firmware/arm_scmi/scmi_perf_domain.c diff --git a/drivers/firmware/arm_scmi/Kconfig b/drivers/firmware/arm_scmi/Kconfig index ea0f5083ac47..706d1264d038 100644 --- a/drivers/firmware/arm_scmi/Kconfig +++ b/drivers/firmware/arm_scmi/Kconfig @@ -181,6 +181,18 @@ config ARM_SCMI_POWER_DOMAIN will be called scmi_pm_domain. Note this may needed early in boot before rootfs may be available. +config ARM_SCMI_PERF_DOMAIN + tristate "SCMI performance domain driver" + depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) + default y + select PM_GENERIC_DOMAINS if PM + help + This enables support for the SCMI performance domains which can be + enabled or disabled via the SCP firmware. + + This driver can also be built as a module. If so, the module will be + called scmi_perf_domain. + config ARM_SCMI_POWER_CONTROL tristate "SCMI system power control driver" depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index b31d78fa66cc..afee66a65dcb 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -17,6 +17,7 @@ obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-core.o obj-$(CONFIG_ARM_SCMI_PROTOCOL) += scmi-module.o obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o +obj-$(CONFIG_ARM_SCMI_PERF_DOMAIN) += scmi_perf_domain.o obj-$(CONFIG_ARM_SCMI_POWER_CONTROL) += scmi_power_control.o ifeq ($(CONFIG_THUMB2_KERNEL)$(CONFIG_CC_IS_CLANG),yy) diff --git a/drivers/firmware/arm_scmi/scmi_perf_domain.c b/drivers/firmware/arm_scmi/scmi_perf_domain.c new file mode 100644 index 000000000000..9be90a7d94de --- /dev/null +++ b/drivers/firmware/arm_scmi/scmi_perf_domain.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SCMI performance domain support. + * + * Copyright (C) 2023 Linaro Ltd. + */ + +#include <linux/err.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/pm_domain.h> +#include <linux/scmi_protocol.h> +#include <linux/slab.h> + +struct scmi_perf_domain { + struct generic_pm_domain genpd; + const struct scmi_perf_proto_ops *perf_ops; + const struct scmi_protocol_handle *ph; + u32 domain_id; + bool can_level_set; +}; + +#define to_scmi_pd(pd) container_of(pd, struct scmi_perf_domain, genpd) + +static int +scmi_pd_set_perf_state(struct generic_pm_domain *genpd, unsigned int state) +{ + struct scmi_perf_domain *pd = to_scmi_pd(genpd); + int ret; + + if (!pd->can_level_set) + return 0; + + ret = pd->perf_ops->level_set(pd->ph, pd->domain_id, state, true); + if (ret) + dev_warn(&genpd->dev, "Failed with %d when trying to set %d perf level", + ret, state); + + return ret; +} + +static int scmi_perf_domain_probe(struct scmi_device *sdev) +{ + struct device *dev = &sdev->dev; + const struct scmi_handle *handle = sdev->handle; + const struct scmi_perf_proto_ops *perf_ops; + struct scmi_protocol_handle *ph; + struct scmi_perf_domain *scmi_pd; + struct genpd_onecell_data *scmi_pd_data; + struct generic_pm_domain **domains; + int num_domains, i, ret = 0; + u32 perf_level; + + if (!handle) + return -ENODEV; + + /* The OF node must specify us as a power-domain provider. */ + if (!of_find_property(dev->of_node, "#power-domain-cells", NULL)) + return 0; + + perf_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PERF, &ph); + if (IS_ERR(perf_ops)) + return PTR_ERR(perf_ops); + + num_domains = perf_ops->num_domains_get(ph); + if (num_domains < 0) { + dev_warn(dev, "Failed with %d when getting num perf domains\n", + num_domains); + return num_domains; + } else if (!num_domains) { + return 0; + } + + scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL); + if (!scmi_pd) + return -ENOMEM; + + scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL); + if (!scmi_pd_data) + return -ENOMEM; + + domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL); + if (!domains) + return -ENOMEM; + + for (i = 0; i < num_domains; i++, scmi_pd++) { + scmi_pd->domain_id = i; + scmi_pd->perf_ops = perf_ops; + scmi_pd->ph = ph; + scmi_pd->can_level_set = perf_ops->can_level_set(ph, i); + + scmi_pd->genpd.name = perf_ops->name_get(ph, i); + scmi_pd->genpd.flags = GENPD_FLAG_OPP_TABLE_FW; + scmi_pd->genpd.set_performance_state = scmi_pd_set_perf_state; + + ret = perf_ops->level_get(ph, i, &perf_level, false); + if (ret) { + dev_dbg(dev, "Failed to get perf level for %s", + scmi_pd->genpd.name); + perf_level = 0; + } + + /* Let the perf level indicate the power-state too. */ + ret = pm_genpd_init(&scmi_pd->genpd, NULL, perf_level == 0); + if (ret) + goto err; + + domains[i] = &scmi_pd->genpd; + } + + scmi_pd_data->domains = domains; + scmi_pd_data->num_domains = num_domains; + + ret = of_genpd_add_provider_onecell(dev->of_node, scmi_pd_data); + if (ret) + goto err; + + dev_set_drvdata(dev, scmi_pd_data); + dev_info(dev, "Initialized %d performance domains", num_domains); + return 0; +err: + for (i--; i >= 0; i--) + pm_genpd_remove(domains[i]); + return ret; +} + +static void scmi_perf_domain_remove(struct scmi_device *sdev) +{ + struct device *dev = &sdev->dev; + struct genpd_onecell_data *scmi_pd_data = dev_get_drvdata(dev); + int i; + + of_genpd_del_provider(dev->of_node); + + for (i = 0; i < scmi_pd_data->num_domains; i++) + pm_genpd_remove(scmi_pd_data->domains[i]); +} + +static const struct scmi_device_id scmi_id_table[] = { + { SCMI_PROTOCOL_PERF, "perf" }, + { }, +}; +MODULE_DEVICE_TABLE(scmi, scmi_id_table); + +static struct scmi_driver scmi_perf_domain_driver = { + .name = "scmi-perf-domain", + .probe = scmi_perf_domain_probe, + .remove = scmi_perf_domain_remove, + .id_table = scmi_id_table, +}; +module_scmi_driver(scmi_perf_domain_driver); + +MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org>"); +MODULE_DESCRIPTION("ARM SCMI perf domain driver"); +MODULE_LICENSE("GPL v2"); -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-06-07 12:47 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-06-07 12:46 [PATCH 00/16] arm_scmi/opp/dvfs: Add generic performance scaling support Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 01/16] firmware: arm_scmi: Extend perf protocol ops to get number of domains Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 02/16] firmware: arm_scmi: Extend perf protocol ops to get the name of a domain Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 03/16] firmware: arm_scmi: Extend perf protocol ops to inform of set level support Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 04/16] cpufreq: scmi: Prepare to move OF parsing of domain-id to cpufreq Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 05/16] firmware: arm_scmi: Align perf ops to use domain-id as in-parameter Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 06/16] firmware: arm_scmi: Drop redundant ->device_domain_id() from perf ops Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 07/16] cpufreq: scmi: Avoid one OF parsing in scmi_get_sharing_cpus() Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 08/16] PM: domains: Allow genpd providers to manage OPP tables directly by its FW Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 09/16] dt-bindings: firmware: arm,scmi: Extend bindings for protocol@13 Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-14 23:00 ` Rob Herring 2023-06-14 23:00 ` Rob Herring 2023-06-15 9:10 ` Ulf Hansson 2023-06-15 9:10 ` Ulf Hansson 2023-07-14 17:14 ` Rob Herring 2023-07-14 17:14 ` Rob Herring 2023-07-15 12:35 ` Ulf Hansson 2023-07-15 12:35 ` Ulf Hansson 2023-06-15 8:44 ` Sudeep Holla 2023-06-15 8:44 ` Sudeep Holla 2023-06-15 9:39 ` Ulf Hansson 2023-06-15 9:39 ` Ulf Hansson 2023-06-15 13:30 ` Sudeep Holla 2023-06-15 13:30 ` Sudeep Holla 2023-06-16 11:48 ` Ulf Hansson 2023-06-16 11:48 ` Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson [this message] 2023-06-07 12:46 ` [PATCH 10/16] firmware: arm_scmi: Add the SCMI performance domain Ulf Hansson 2023-06-07 12:46 ` [PATCH 11/16] OPP: Add dev_pm_opp_add_dynamic() to allow more flexibility Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-08 5:29 ` Viresh Kumar 2023-06-08 5:29 ` Viresh Kumar 2023-06-08 8:59 ` Ulf Hansson 2023-06-08 8:59 ` Ulf Hansson 2023-06-08 9:22 ` Viresh Kumar 2023-06-08 9:22 ` Viresh Kumar 2023-06-08 9:40 ` Ulf Hansson 2023-06-08 9:40 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 12/16] OPP: Extend dev_pm_opp_data with performance level Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 13/16] OPP: Extend dev_pm_opp_data with OPP provider support Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-08 5:34 ` Viresh Kumar 2023-06-08 5:34 ` Viresh Kumar 2023-06-08 9:37 ` Ulf Hansson 2023-06-08 9:37 ` Ulf Hansson 2023-06-08 10:45 ` Viresh Kumar 2023-06-08 10:45 ` Viresh Kumar 2023-06-08 11:45 ` Ulf Hansson 2023-06-08 11:45 ` Ulf Hansson 2023-06-09 5:10 ` Viresh Kumar 2023-06-09 5:10 ` Viresh Kumar 2023-06-09 10:59 ` Ulf Hansson 2023-06-09 10:59 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 14/16] firmware: arm_scmi: Simplify error path in scmi_dvfs_device_opps_add() Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 15/16] firmware: arm_scmi: Extend perf support with OPP from genpd providers Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 12:46 ` [PATCH 16/16] firmware: arm_scmi: Add generic OPP support to the SCMI performance domain Ulf Hansson 2023-06-07 12:46 ` Ulf Hansson 2023-06-07 14:43 ` [PATCH 00/16] arm_scmi/opp/dvfs: Add generic performance scaling support Cristian Marussi 2023-06-07 14:43 ` Cristian Marussi 2023-06-08 9:53 ` Ulf Hansson 2023-06-08 9:53 ` Ulf Hansson
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