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author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-06 14:15:47 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-06 14:15:47 +0300 |
commit | 94fb1afb14c4f0ceb8c5508ddddac6819f662e95 (patch) | |
tree | 4988e5769dc7482caa7f441475ae31f50bbd37ef /drivers/cpuidle/cpuidle-psci-domain.c | |
parent | c4735d990268399da9133b0ad445e488ece009ad (diff) | |
parent | 47ec5303d73ea344e84f46660fff693c57641386 (diff) | |
download | linux-94fb1afb14c4f0ceb8c5508ddddac6819f662e95.tar.xz |
Mgerge remote-tracking branch 'torvalds/master' into perf/core
To sync headers, for instance, in this case tools/perf was ahead of
upstream till Linus merged tip/perf/core to get the
PERF_RECORD_TEXT_POKE changes:
Warning: Kernel ABI header at 'tools/include/uapi/linux/perf_event.h' differs from latest version at 'include/uapi/linux/perf_event.h'
diff -u tools/include/uapi/linux/perf_event.h include/uapi/linux/perf_event.h
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'drivers/cpuidle/cpuidle-psci-domain.c')
-rw-r--r-- | drivers/cpuidle/cpuidle-psci-domain.c | 74 |
1 files changed, 51 insertions, 23 deletions
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c index 423f03bbeb74..b6e9649ab0da 100644 --- a/drivers/cpuidle/cpuidle-psci-domain.c +++ b/drivers/cpuidle/cpuidle-psci-domain.c @@ -12,6 +12,7 @@ #include <linux/cpu.h> #include <linux/device.h> #include <linux/kernel.h> +#include <linux/platform_device.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> #include <linux/psci.h> @@ -26,7 +27,7 @@ struct psci_pd_provider { }; static LIST_HEAD(psci_pd_providers); -static bool osi_mode_enabled __initdata; +static bool psci_pd_allow_domain_state; static int psci_pd_power_off(struct generic_pm_domain *pd) { @@ -36,6 +37,9 @@ static int psci_pd_power_off(struct generic_pm_domain *pd) if (!state->data) return 0; + if (!psci_pd_allow_domain_state) + return -EBUSY; + /* OSI mode is enabled, set the corresponding domain state. */ pd_state = state->data; psci_set_domain_state(*pd_state); @@ -43,8 +47,8 @@ static int psci_pd_power_off(struct generic_pm_domain *pd) return 0; } -static int __init psci_pd_parse_state_nodes(struct genpd_power_state *states, - int state_count) +static int psci_pd_parse_state_nodes(struct genpd_power_state *states, + int state_count) { int i, ret; u32 psci_state, *psci_state_buf; @@ -73,7 +77,7 @@ free_state: return ret; } -static int __init psci_pd_parse_states(struct device_node *np, +static int psci_pd_parse_states(struct device_node *np, struct genpd_power_state **states, int *state_count) { int ret; @@ -101,7 +105,7 @@ static void psci_pd_free_states(struct genpd_power_state *states, kfree(states); } -static int __init psci_pd_init(struct device_node *np) +static int psci_pd_init(struct device_node *np) { struct generic_pm_domain *pd; struct psci_pd_provider *pd_provider; @@ -168,7 +172,7 @@ out: return ret; } -static void __init psci_pd_remove(void) +static void psci_pd_remove(void) { struct psci_pd_provider *pd_provider, *it; struct generic_pm_domain *genpd; @@ -186,7 +190,7 @@ static void __init psci_pd_remove(void) } } -static int __init psci_pd_init_topology(struct device_node *np, bool add) +static int psci_pd_init_topology(struct device_node *np, bool add) { struct device_node *node; struct of_phandle_args child, parent; @@ -212,24 +216,33 @@ static int __init psci_pd_init_topology(struct device_node *np, bool add) return 0; } -static int __init psci_pd_add_topology(struct device_node *np) +static int psci_pd_add_topology(struct device_node *np) { return psci_pd_init_topology(np, true); } -static void __init psci_pd_remove_topology(struct device_node *np) +static void psci_pd_remove_topology(struct device_node *np) { psci_pd_init_topology(np, false); } -static const struct of_device_id psci_of_match[] __initconst = { +static void psci_cpuidle_domain_sync_state(struct device *dev) +{ + /* + * All devices have now been attached/probed to the PM domain topology, + * hence it's fine to allow domain states to be picked. + */ + psci_pd_allow_domain_state = true; +} + +static const struct of_device_id psci_of_match[] = { { .compatible = "arm,psci-1.0" }, {} }; -static int __init psci_idle_init_domains(void) +static int psci_cpuidle_domain_probe(struct platform_device *pdev) { - struct device_node *np = of_find_matching_node(NULL, psci_of_match); + struct device_node *np = pdev->dev.of_node; struct device_node *node; int ret = 0, pd_count = 0; @@ -238,7 +251,7 @@ static int __init psci_idle_init_domains(void) /* Currently limit the hierarchical topology to be used in OSI mode. */ if (!psci_has_osi_support()) - goto out; + return 0; /* * Parse child nodes for the "#power-domain-cells" property and @@ -257,7 +270,7 @@ static int __init psci_idle_init_domains(void) /* Bail out if not using the hierarchical CPU topology. */ if (!pd_count) - goto out; + return 0; /* Link genpd masters/subdomains to model the CPU topology. */ ret = psci_pd_add_topology(np); @@ -272,10 +285,8 @@ static int __init psci_idle_init_domains(void) goto remove_pd; } - osi_mode_enabled = true; - of_node_put(np); pr_info("Initialized CPU PM domain topology\n"); - return pd_count; + return 0; put_node: of_node_put(node); @@ -283,19 +294,28 @@ remove_pd: if (pd_count) psci_pd_remove(); pr_err("failed to create CPU PM domains ret=%d\n", ret); -out: - of_node_put(np); return ret; } + +static struct platform_driver psci_cpuidle_domain_driver = { + .probe = psci_cpuidle_domain_probe, + .driver = { + .name = "psci-cpuidle-domain", + .of_match_table = psci_of_match, + .sync_state = psci_cpuidle_domain_sync_state, + }, +}; + +static int __init psci_idle_init_domains(void) +{ + return platform_driver_register(&psci_cpuidle_domain_driver); +} subsys_initcall(psci_idle_init_domains); -struct device __init *psci_dt_attach_cpu(int cpu) +struct device *psci_dt_attach_cpu(int cpu) { struct device *dev; - if (!osi_mode_enabled) - return NULL; - dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci"); if (IS_ERR_OR_NULL(dev)) return dev; @@ -306,3 +326,11 @@ struct device __init *psci_dt_attach_cpu(int cpu) return dev; } + +void psci_dt_detach_cpu(struct device *dev) +{ + if (IS_ERR_OR_NULL(dev)) + return; + + dev_pm_domain_detach(dev, false); +} |