From: Jonathan Cameron <Jonathan.Cameron@huawei.com> To: Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>, <linux-pm@vger.kernel.org>, <loongarch@lists.linux.dev>, <linux-acpi@vger.kernel.org>, <linux-arch@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <kvmarm@lists.linux.dev>, <x86@kernel.org>, Russell King <linux@armlinux.org.uk>, "Rafael J . Wysocki" <rafael@kernel.org>, Miguel Luis <miguel.luis@oracle.com>, James Morse <james.morse@arm.com>, Salil Mehta <salil.mehta@huawei.com>, Jean-Philippe Brucker <jean-philippe@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org> Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, <linuxarm@huawei.com>, <justin.he@arm.com>, <jianyong.wu@arm.com> Subject: [PATCH v7 01/16] ACPI: processor: Simplify initial onlining to use same path for cold and hotplug Date: Thu, 18 Apr 2024 14:53:57 +0100 [thread overview] Message-ID: <20240418135412.14730-2-Jonathan.Cameron@huawei.com> (raw) In-Reply-To: <20240418135412.14730-1-Jonathan.Cameron@huawei.com> Separate code paths, combined with a flag set in acpi_processor.c to indicate a struct acpi_processor was for a hotplugged CPU ensured that per CPU data was only set up the first time that a CPU was initialized. This appears to be unnecessary as the paths can be combined by letting the online logic also handle any CPUs online at the time of driver load. Motivation for this change, beyond simplification, is that ARM64 virtual CPU HP uses the same code paths for hotplug and cold path in acpi_processor.c so had no easy way to set the flag for hotplug only. Removing this necessity will enable ARM64 vCPU HP to reuse the existing code paths. Leave noisy pr_info() in place but update it to not state the CPU was hotplugged. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- v7: No change. v6: New patch. RFT: I have very limited test resources for x86 and other architectures that may be affected by this change. --- drivers/acpi/acpi_processor.c | 1 - drivers/acpi/processor_driver.c | 44 ++++++++++----------------------- include/acpi/processor.h | 2 +- 3 files changed, 14 insertions(+), 33 deletions(-) diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 7a0dd35d62c9..7fc924aeeed0 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -216,7 +216,6 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr) * gets online for the first time. */ pr_info("CPU%d has been hot-added\n", pr->id); - pr->flags.need_hotplug_init = 1; out: cpus_write_unlock(); diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 67db60eda370..55782eac3ff1 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -33,7 +33,6 @@ MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Processor Driver"); MODULE_LICENSE("GPL"); -static int acpi_processor_start(struct device *dev); static int acpi_processor_stop(struct device *dev); static const struct acpi_device_id processor_device_ids[] = { @@ -47,7 +46,6 @@ static struct device_driver acpi_processor_driver = { .name = "processor", .bus = &cpu_subsys, .acpi_match_table = processor_device_ids, - .probe = acpi_processor_start, .remove = acpi_processor_stop, }; @@ -115,12 +113,10 @@ static int acpi_soft_cpu_online(unsigned int cpu) * CPU got physically hotplugged and onlined for the first time: * Initialize missing things. */ - if (pr->flags.need_hotplug_init) { + if (!pr->flags.previously_online) { int ret; - pr_info("Will online and init hotplugged CPU: %d\n", - pr->id); - pr->flags.need_hotplug_init = 0; + pr_info("Will online and init CPU: %d\n", pr->id); ret = __acpi_processor_start(device); WARN(ret, "Failed to start CPU: %d\n", pr->id); } else { @@ -167,9 +163,6 @@ static int __acpi_processor_start(struct acpi_device *device) if (!pr) return -ENODEV; - if (pr->flags.need_hotplug_init) - return 0; - result = acpi_cppc_processor_probe(pr); if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS)) dev_dbg(&device->dev, "CPPC data invalid or not present\n"); @@ -185,32 +178,21 @@ static int __acpi_processor_start(struct acpi_device *device) status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, acpi_processor_notify, device); - if (ACPI_SUCCESS(status)) - return 0; + if (!ACPI_SUCCESS(status)) { + result = -ENODEV; + goto err_thermal_exit; + } + pr->flags.previously_online = 1; - result = -ENODEV; - acpi_processor_thermal_exit(pr, device); + return 0; +err_thermal_exit: + acpi_processor_thermal_exit(pr, device); err_power_exit: acpi_processor_power_exit(pr); return result; } -static int acpi_processor_start(struct device *dev) -{ - struct acpi_device *device = ACPI_COMPANION(dev); - int ret; - - if (!device) - return -ENODEV; - - /* Protect against concurrent CPU hotplug operations */ - cpu_hotplug_disable(); - ret = __acpi_processor_start(device); - cpu_hotplug_enable(); - return ret; -} - static int acpi_processor_stop(struct device *dev) { struct acpi_device *device = ACPI_COMPANION(dev); @@ -279,9 +261,9 @@ static int __init acpi_processor_driver_init(void) if (result < 0) return result; - result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, - "acpi/cpu-drv:online", - acpi_soft_cpu_online, NULL); + result = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, + "acpi/cpu-drv:online", + acpi_soft_cpu_online, NULL); if (result < 0) goto err; hp_online = result; diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 3f34ebb27525..e6f6074eadbf 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -217,7 +217,7 @@ struct acpi_processor_flags { u8 has_lpi:1; u8 power_setup_done:1; u8 bm_rld_set:1; - u8 need_hotplug_init:1; + u8 previously_online:1; }; struct acpi_processor { -- 2.39.2
WARNING: multiple messages have this Message-ID (diff)
From: Jonathan Cameron <Jonathan.Cameron@huawei.com> To: Thomas Gleixner <tglx@linutronix.de>, Peter Zijlstra <peterz@infradead.org>, <linux-pm@vger.kernel.org>, <loongarch@lists.linux.dev>, <linux-acpi@vger.kernel.org>, <linux-arch@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <kvmarm@lists.linux.dev>, <x86@kernel.org>, Russell King <linux@armlinux.org.uk>, "Rafael J . Wysocki" <rafael@kernel.org>, Miguel Luis <miguel.luis@oracle.com>, James Morse <james.morse@arm.com>, Salil Mehta <salil.mehta@huawei.com>, Jean-Philippe Brucker <jean-philippe@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org> Cc: Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, <linuxarm@huawei.com>, <justin.he@arm.com>, <jianyong.wu@arm.com> Subject: [PATCH v7 01/16] ACPI: processor: Simplify initial onlining to use same path for cold and hotplug Date: Thu, 18 Apr 2024 14:53:57 +0100 [thread overview] Message-ID: <20240418135412.14730-2-Jonathan.Cameron@huawei.com> (raw) In-Reply-To: <20240418135412.14730-1-Jonathan.Cameron@huawei.com> Separate code paths, combined with a flag set in acpi_processor.c to indicate a struct acpi_processor was for a hotplugged CPU ensured that per CPU data was only set up the first time that a CPU was initialized. This appears to be unnecessary as the paths can be combined by letting the online logic also handle any CPUs online at the time of driver load. Motivation for this change, beyond simplification, is that ARM64 virtual CPU HP uses the same code paths for hotplug and cold path in acpi_processor.c so had no easy way to set the flag for hotplug only. Removing this necessity will enable ARM64 vCPU HP to reuse the existing code paths. Leave noisy pr_info() in place but update it to not state the CPU was hotplugged. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- v7: No change. v6: New patch. RFT: I have very limited test resources for x86 and other architectures that may be affected by this change. --- drivers/acpi/acpi_processor.c | 1 - drivers/acpi/processor_driver.c | 44 ++++++++++----------------------- include/acpi/processor.h | 2 +- 3 files changed, 14 insertions(+), 33 deletions(-) diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index 7a0dd35d62c9..7fc924aeeed0 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -216,7 +216,6 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr) * gets online for the first time. */ pr_info("CPU%d has been hot-added\n", pr->id); - pr->flags.need_hotplug_init = 1; out: cpus_write_unlock(); diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 67db60eda370..55782eac3ff1 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -33,7 +33,6 @@ MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Processor Driver"); MODULE_LICENSE("GPL"); -static int acpi_processor_start(struct device *dev); static int acpi_processor_stop(struct device *dev); static const struct acpi_device_id processor_device_ids[] = { @@ -47,7 +46,6 @@ static struct device_driver acpi_processor_driver = { .name = "processor", .bus = &cpu_subsys, .acpi_match_table = processor_device_ids, - .probe = acpi_processor_start, .remove = acpi_processor_stop, }; @@ -115,12 +113,10 @@ static int acpi_soft_cpu_online(unsigned int cpu) * CPU got physically hotplugged and onlined for the first time: * Initialize missing things. */ - if (pr->flags.need_hotplug_init) { + if (!pr->flags.previously_online) { int ret; - pr_info("Will online and init hotplugged CPU: %d\n", - pr->id); - pr->flags.need_hotplug_init = 0; + pr_info("Will online and init CPU: %d\n", pr->id); ret = __acpi_processor_start(device); WARN(ret, "Failed to start CPU: %d\n", pr->id); } else { @@ -167,9 +163,6 @@ static int __acpi_processor_start(struct acpi_device *device) if (!pr) return -ENODEV; - if (pr->flags.need_hotplug_init) - return 0; - result = acpi_cppc_processor_probe(pr); if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS)) dev_dbg(&device->dev, "CPPC data invalid or not present\n"); @@ -185,32 +178,21 @@ static int __acpi_processor_start(struct acpi_device *device) status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, acpi_processor_notify, device); - if (ACPI_SUCCESS(status)) - return 0; + if (!ACPI_SUCCESS(status)) { + result = -ENODEV; + goto err_thermal_exit; + } + pr->flags.previously_online = 1; - result = -ENODEV; - acpi_processor_thermal_exit(pr, device); + return 0; +err_thermal_exit: + acpi_processor_thermal_exit(pr, device); err_power_exit: acpi_processor_power_exit(pr); return result; } -static int acpi_processor_start(struct device *dev) -{ - struct acpi_device *device = ACPI_COMPANION(dev); - int ret; - - if (!device) - return -ENODEV; - - /* Protect against concurrent CPU hotplug operations */ - cpu_hotplug_disable(); - ret = __acpi_processor_start(device); - cpu_hotplug_enable(); - return ret; -} - static int acpi_processor_stop(struct device *dev) { struct acpi_device *device = ACPI_COMPANION(dev); @@ -279,9 +261,9 @@ static int __init acpi_processor_driver_init(void) if (result < 0) return result; - result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, - "acpi/cpu-drv:online", - acpi_soft_cpu_online, NULL); + result = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, + "acpi/cpu-drv:online", + acpi_soft_cpu_online, NULL); if (result < 0) goto err; hp_online = result; diff --git a/include/acpi/processor.h b/include/acpi/processor.h index 3f34ebb27525..e6f6074eadbf 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -217,7 +217,7 @@ struct acpi_processor_flags { u8 has_lpi:1; u8 power_setup_done:1; u8 bm_rld_set:1; - u8 need_hotplug_init:1; + u8 previously_online:1; }; struct acpi_processor { -- 2.39.2 _______________________________________________ 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:[~2024-04-18 13:54 UTC|newest] Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-04-18 13:53 [PATCH v7 00/16] ACPI/arm64: add support for virtual cpu hotplug Jonathan Cameron 2024-04-18 13:53 ` Jonathan Cameron 2024-04-18 13:53 ` Jonathan Cameron [this message] 2024-04-18 13:53 ` [PATCH v7 01/16] ACPI: processor: Simplify initial onlining to use same path for cold and hotplug Jonathan Cameron 2024-04-22 18:46 ` Rafael J. Wysocki 2024-04-22 18:46 ` Rafael J. Wysocki 2024-04-23 6:18 ` Hanjun Guo 2024-04-23 6:18 ` Hanjun Guo 2024-04-26 9:23 ` Gavin Shan 2024-04-26 9:23 ` Gavin Shan 2024-04-18 13:53 ` [PATCH v7 02/16] cpu: Do not warn on arch_register_cpu() returning -EPROBE_DEFER Jonathan Cameron 2024-04-18 13:53 ` Jonathan Cameron 2024-04-23 6:22 ` Hanjun Guo 2024-04-23 6:22 ` Hanjun Guo 2024-04-26 9:20 ` Gavin Shan 2024-04-26 9:20 ` Gavin Shan 2024-04-18 13:53 ` [PATCH v7 03/16] ACPI: processor: Drop duplicated check on _STA (enabled + present) Jonathan Cameron 2024-04-18 13:53 ` Jonathan Cameron 2024-04-22 18:48 ` Rafael J. Wysocki 2024-04-22 18:48 ` Rafael J. Wysocki 2024-04-23 6:49 ` Hanjun Guo 2024-04-23 6:49 ` Hanjun Guo 2024-04-23 9:31 ` Rafael J. Wysocki 2024-04-23 9:31 ` Rafael J. Wysocki 2024-04-23 11:13 ` Hanjun Guo 2024-04-23 11:13 ` Hanjun Guo 2024-04-26 9:24 ` Gavin Shan 2024-04-26 9:24 ` Gavin Shan 2024-04-18 13:54 ` [PATCH v7 04/16] ACPI: processor: Move checks and availability of acpi_processor earlier Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 18:56 ` Rafael J. Wysocki 2024-04-22 18:56 ` Rafael J. Wysocki 2024-04-24 16:53 ` Jonathan Cameron 2024-04-24 16:53 ` Jonathan Cameron 2024-04-23 11:53 ` Hanjun Guo 2024-04-23 11:53 ` Hanjun Guo 2024-04-24 17:18 ` Jonathan Cameron 2024-04-24 17:18 ` Jonathan Cameron 2024-04-25 1:20 ` Hanjun Guo 2024-04-25 1:20 ` Hanjun Guo 2024-04-18 13:54 ` [PATCH v7 05/16] ACPI: processor: Add acpi_get_processor_handle() helper Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 18:59 ` Rafael J. Wysocki 2024-04-22 18:59 ` Rafael J. Wysocki 2024-04-26 9:15 ` Gavin Shan 2024-04-26 9:15 ` Gavin Shan 2024-04-18 13:54 ` [PATCH v7 06/16] ACPI: processor: Register deferred CPUs from acpi_processor_get_info() Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 19:02 ` Rafael J. Wysocki 2024-04-22 19:02 ` Rafael J. Wysocki 2024-04-23 11:58 ` Hanjun Guo 2024-04-23 11:58 ` Hanjun Guo 2024-04-26 9:18 ` Gavin Shan 2024-04-26 9:18 ` Gavin Shan 2024-04-18 13:54 ` [PATCH v7 07/16] ACPI: scan: switch to flags for acpi_scan_check_and_detach() Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 19:05 ` Rafael J. Wysocki 2024-04-22 19:05 ` Rafael J. Wysocki 2024-04-23 12:02 ` Hanjun Guo 2024-04-23 12:02 ` Hanjun Guo 2024-04-26 9:25 ` Gavin Shan 2024-04-26 9:25 ` Gavin Shan 2024-04-18 13:54 ` [PATCH v7 08/16] ACPI: Add post_eject to struct acpi_scan_handler for cpu hotplug Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 19:10 ` Rafael J. Wysocki 2024-04-22 19:10 ` Rafael J. Wysocki 2024-04-23 12:06 ` Hanjun Guo 2024-04-23 12:06 ` Hanjun Guo 2024-04-26 11:48 ` Jonathan Cameron 2024-04-26 11:48 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 09/16] arm64: acpi: Move get_cpu_for_acpi_id() to a header Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 10:46 ` Jonathan Cameron 2024-04-22 10:46 ` Jonathan Cameron 2024-04-23 12:10 ` Hanjun Guo 2024-04-23 12:10 ` Hanjun Guo 2024-04-18 13:54 ` [PATCH v7 10/16] irqchip/gic-v3: Don't return errors from gic_acpi_match_gicc() Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 10:39 ` Jonathan Cameron 2024-04-22 10:39 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 11/16] irqchip/gic-v3: Add support for ACPI's disabled but 'online capable' CPUs Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 10:40 ` Jonathan Cameron 2024-04-22 10:40 ` Jonathan Cameron 2024-04-23 12:01 ` Marc Zyngier 2024-04-23 12:01 ` Marc Zyngier 2024-04-24 12:54 ` Jonathan Cameron 2024-04-24 12:54 ` Jonathan Cameron 2024-04-24 15:33 ` Marc Zyngier 2024-04-24 15:33 ` Marc Zyngier 2024-04-24 16:35 ` Salil Mehta 2024-04-24 16:35 ` Salil Mehta 2024-04-24 17:08 ` Jonathan Cameron 2024-04-24 17:08 ` Jonathan Cameron 2024-04-25 10:23 ` Jonathan Cameron 2024-04-25 10:23 ` Jonathan Cameron 2024-04-25 12:31 ` Jonathan Cameron 2024-04-25 12:31 ` Jonathan Cameron 2024-04-25 15:00 ` Jonathan Cameron 2024-04-25 15:00 ` Jonathan Cameron 2024-04-25 16:55 ` Jonathan Cameron 2024-04-25 16:55 ` Jonathan Cameron 2024-04-26 12:41 ` Marc Zyngier 2024-04-26 12:41 ` Marc Zyngier 2024-04-25 9:28 ` Jonathan Cameron 2024-04-25 9:28 ` Jonathan Cameron 2024-04-25 9:56 ` Jonathan Cameron 2024-04-25 9:56 ` Jonathan Cameron 2024-04-25 10:13 ` Jonathan Cameron 2024-04-25 10:13 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 12/16] arm64: psci: Ignore DENIED CPUs Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-22 10:44 ` Jonathan Cameron 2024-04-22 10:44 ` Jonathan Cameron 2024-04-26 9:36 ` Gavin Shan 2024-04-26 9:36 ` Gavin Shan 2024-04-26 9:57 ` Jonathan Cameron 2024-04-26 9:57 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 13/16] arm64: arch_register_cpu() variant to check if an ACPI handle is now available Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 14/16] arm64: Kconfig: Enable hotplug CPU on arm64 if ACPI_PROCESSOR is enabled Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-24 17:24 ` Jonathan Cameron 2024-04-24 17:24 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 15/16] arm64: document virtual CPU hotplug's expectations Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-18 13:54 ` [PATCH v7 16/16] cpumask: Add enabled cpumask for present CPUs that can be brought online Jonathan Cameron 2024-04-18 13:54 ` Jonathan Cameron 2024-04-18 19:50 ` [PATCH v7 00/16] ACPI/arm64: add support for virtual cpu hotplug Rafael J. Wysocki 2024-04-18 19:50 ` Rafael J. Wysocki 2024-04-22 19:16 ` Rafael J. Wysocki 2024-04-22 19:16 ` Rafael J. Wysocki 2024-04-19 15:39 ` Miguel Luis 2024-04-19 15:39 ` Miguel Luis
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