From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
To: <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: <linuxarm@huawei.com>, <justin.he@arm.com>, <jianyong.wu@arm.com>
Subject: [PATCH v5 05/18] ACPI: utils: Add an acpi_sta_enabled() helper and use it in acpi_processor_make_present()
Date: Fri, 12 Apr 2024 15:37:06 +0100 [thread overview]
Message-ID: <20240412143719.11398-6-Jonathan.Cameron@huawei.com> (raw)
In-Reply-To: <20240412143719.11398-1-Jonathan.Cameron@huawei.com>
A device is enabled only if both the present and enabled bits
are set in the result of calling the _STA method, or the
_STA method is not present (in which case the device is always
present and enabled).
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
v5: New patch
---
drivers/acpi/acpi_processor.c | 8 +++-----
drivers/acpi/utils.c | 21 +++++++++++++++++++++
include/acpi/acpi_bus.h | 1 +
3 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 05264722c207..3aa43dee4391 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -185,8 +185,6 @@ static void __init acpi_pcc_cpufreq_init(void) {}
/* Initialization */
static int acpi_processor_make_present(struct acpi_processor *pr)
{
- unsigned long long sta;
- acpi_status status;
int ret;
if (!IS_ENABLED(CONFIG_ACPI_HOTPLUG_CPU))
@@ -195,9 +193,9 @@ static int acpi_processor_make_present(struct acpi_processor *pr)
if (invalid_phys_cpuid(pr->phys_id))
return -ENODEV;
- status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
- if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
- return -ENODEV;
+ ret = acpi_sta_enabled(pr->handle);
+ if (ret)
+ return ret;
cpu_maps_update_begin();
cpus_write_lock();
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 202234ba54bd..3004426b218c 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -744,6 +744,27 @@ acpi_status acpi_evaluate_reg(acpi_handle handle, u8 space_id, u32 function)
}
EXPORT_SYMBOL(acpi_evaluate_reg);
+int acpi_sta_enabled(acpi_handle handle)
+{
+ unsigned long long sta;
+ bool present, enabled;
+ acpi_status status;
+
+ if (acpi_has_method(handle, "_STA")) {
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ present = sta & ACPI_STA_DEVICE_PRESENT;
+ enabled = sta & ACPI_STA_DEVICE_ENABLED;
+ if (!present || !enabled) {
+ return -EPROBE_DEFER;
+ }
+ return 0;
+ }
+ return 0; /* No _STA means always on! */
+}
+
/**
* acpi_evaluate_dsm - evaluate device's _DSM method
* @handle: ACPI device handle
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 5de954e2b18a..e193507fd743 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -51,6 +51,7 @@ bool acpi_ata_match(acpi_handle handle);
bool acpi_bay_match(acpi_handle handle);
bool acpi_dock_match(acpi_handle handle);
+int acpi_sta_enabled(acpi_handle handle);
bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs);
union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
u64 rev, u64 func, union acpi_object *argv4);
--
2.39.2
next prev parent reply other threads:[~2024-04-12 14:39 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-12 14:37 [PATCH v5 00/18] ACPI/arm64: add support for virtual cpu hotplug Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 01/18] cpu: Do not warn on arch_register_cpu() returning -EPROBE_DEFER Jonathan Cameron
2024-04-12 17:42 ` Rafael J. Wysocki
2024-04-22 3:53 ` Gavin Shan
2024-04-12 14:37 ` [PATCH v5 02/18] ACPI: processor: Set the ACPI_COMPANION for the struct cpu instance Jonathan Cameron
2024-04-12 18:10 ` Rafael J. Wysocki
2024-04-15 15:48 ` Jonathan Cameron
2024-04-15 16:16 ` Rafael J. Wysocki
2024-04-15 16:19 ` Rafael J. Wysocki
2024-04-15 16:50 ` Jonathan Cameron
2024-04-15 17:34 ` Jonathan Cameron
2024-04-15 17:41 ` Rafael J. Wysocki
2024-04-16 17:35 ` Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 03/18] ACPI: processor: Register deferred CPUs from acpi_processor_get_info() Jonathan Cameron
2024-04-12 18:30 ` Rafael J. Wysocki
2024-04-12 20:16 ` Russell King (Oracle)
2024-04-12 20:54 ` Thomas Gleixner
2024-04-12 21:52 ` Russell King (Oracle)
2024-04-12 23:23 ` Thomas Gleixner
2024-04-15 8:45 ` Jonathan Cameron
2024-04-15 9:16 ` Jonathan Cameron
2024-04-15 9:31 ` Jonathan Cameron
2024-04-15 11:57 ` Jonathan Cameron
2024-04-15 11:37 ` Rafael J. Wysocki
2024-04-15 11:56 ` Jonathan Cameron
2024-04-15 12:04 ` Rafael J. Wysocki
2024-04-15 12:23 ` Jonathan Cameron
2024-04-16 17:41 ` Jonathan Cameron
2024-04-16 19:02 ` Rafael J. Wysocki
2024-04-17 10:39 ` Jonathan Cameron
2024-04-15 12:37 ` Salil Mehta
2024-04-15 12:41 ` Rafael J. Wysocki
2024-04-15 11:51 ` Salil Mehta
2024-04-15 12:51 ` Rafael J. Wysocki
2024-04-15 15:31 ` Salil Mehta
2024-04-15 16:38 ` Rafael J. Wysocki
2024-04-17 15:01 ` Salil Mehta
2024-04-17 16:19 ` Rafael J. Wysocki
2024-04-15 10:52 ` Jonathan Cameron
2024-04-15 11:11 ` Jonathan Cameron
2024-04-15 11:52 ` Rafael J. Wysocki
2024-04-15 11:07 ` Salil Mehta
2024-04-16 14:00 ` Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 04/18] ACPI: Rename acpi_processor_hotadd_init and remove pre-processor guards Jonathan Cameron
2024-04-12 14:37 ` Jonathan Cameron [this message]
2024-04-12 14:37 ` [PATCH v5 06/18] ACPI: scan: Add parameter to allow defering some actions in acpi_scan_check_and_detach Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 07/18] ACPI: Add post_eject to struct acpi_scan_handler for cpu hotplug Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 08/18] ACPI: convert acpi_processor_post_eject() to use IS_ENABLED() Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 09/18] ACPI: Check _STA present bit before making CPUs not present Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 10/18] ACPI: Warn when the present bit changes but the feature is not enabled Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 11/18] arm64: acpi: Move get_cpu_for_acpi_id() to a header Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 12/18] irqchip/gic-v3: Don't return errors from gic_acpi_match_gicc() Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 13/18] irqchip/gic-v3: Add support for ACPI's disabled but 'online capable' CPUs Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 14/18] arm64: psci: Ignore DENIED CPUs Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 15/18] arm64: arch_register_cpu() variant to allow checking of ACPI _STA Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 16/18] ACPI: add support to (un)register CPUs based on the _STA enabled bit Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 17/18] arm64: document virtual CPU hotplug's expectations Jonathan Cameron
2024-04-12 14:37 ` [PATCH v5 18/18] cpumask: Add enabled cpumask for present CPUs that can be brought online Jonathan Cameron
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