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Message-ID: <20240529133446.28446-7-Jonathan.Cameron@huawei.com>
Date: Wed, 29 May 2024 14:34:33 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>, Catalin
Marinas <catalin.marinas@....com>, <linux-acpi@...r.kernel.org>,
<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>
CC: Mark Rutland <mark.rutland@....com>, Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>, <loongarch@...ts.linux.dev>,
<x86@...nel.org>, Russell King <linux@...linux.org.uk>, "Rafael J . Wysocki"
<rafael@...nel.org>, Miguel Luis <miguel.luis@...cle.com>, James Morse
<james.morse@....com>, Salil Mehta <salil.mehta@...wei.com>, Jean-Philippe
Brucker <jean-philippe@...aro.org>, Hanjun Guo <guohanjun@...wei.com>, Gavin
Shan <gshan@...hat.com>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov
<bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
<linuxarm@...wei.com>, <justin.he@....com>, <jianyong.wu@....com>
Subject: [PATCH v10 06/19] ACPI: processor: Move checks and availability of acpi_processor earlier
Make the per_cpu(processors, cpu) entries available earlier so that
they are available in arch_register_cpu() as ARM64 will need access
to the acpi_handle to distinguish between acpi_processor_add()
and earlier registration attempts (which will fail as _STA cannot
be checked).
Reorder the remove flow to clear this per_cpu() after
arch_unregister_cpu() has completed, allowing it to be used in
there as well.
Note that on x86 for the CPU hotplug case, the pr->id prior to
acpi_map_cpu() may be invalid. Thus the per_cpu() structures
must be initialized after that call or after checking the ID
is valid (not hotplug path).
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Gavin Shan <gshan@...hat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
v10: Thanks To Rafael and Gavin for the same suggestion.
- Make the acpi_process_set_per_cpu() function return an int
(-EINVAL or 0 as appropriate), simplifying how it is used.
---
drivers/acpi/acpi_processor.c | 88 +++++++++++++++++++++--------------
1 file changed, 52 insertions(+), 36 deletions(-)
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index 16e36e55a560..0bc0419adf6b 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -183,8 +183,38 @@ static void __init acpi_pcc_cpufreq_init(void) {}
#endif /* CONFIG_X86 */
/* Initialization */
+static DEFINE_PER_CPU(void *, processor_device_array);
+
+static int acpi_processor_set_per_cpu(struct acpi_processor *pr,
+ struct acpi_device *device)
+{
+ BUG_ON(pr->id >= nr_cpu_ids);
+
+ /*
+ * Buggy BIOS check.
+ * ACPI id of processors can be reported wrongly by the BIOS.
+ * Don't trust it blindly
+ */
+ if (per_cpu(processor_device_array, pr->id) != NULL &&
+ per_cpu(processor_device_array, pr->id) != device) {
+ dev_warn(&device->dev,
+ "BIOS reported wrong ACPI id %d for the processor\n",
+ pr->id);
+ return -EINVAL;
+ }
+ /*
+ * processor_device_array is not cleared on errors to allow buggy BIOS
+ * checks.
+ */
+ per_cpu(processor_device_array, pr->id) = device;
+ per_cpu(processors, pr->id) = pr;
+
+ return 0;
+}
+
#ifdef CONFIG_ACPI_HOTPLUG_CPU
-static int acpi_processor_hotadd_init(struct acpi_processor *pr)
+static int acpi_processor_hotadd_init(struct acpi_processor *pr,
+ struct acpi_device *device)
{
int ret;
@@ -198,8 +228,16 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
if (ret)
goto out;
+ ret = acpi_processor_set_per_cpu(pr, device);
+ if (ret) {
+ acpi_unmap_cpu(pr->id);
+ goto out;
+ }
+
ret = arch_register_cpu(pr->id);
if (ret) {
+ /* Leave the processor device array in place to detect buggy bios */
+ per_cpu(processors, pr->id) = NULL;
acpi_unmap_cpu(pr->id);
goto out;
}
@@ -217,7 +255,8 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
return ret;
}
#else
-static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
+static inline int acpi_processor_hotadd_init(struct acpi_processor *pr,
+ struct acpi_device *device)
{
return -ENODEV;
}
@@ -232,6 +271,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
acpi_status status = AE_OK;
static int cpu0_initialized;
unsigned long long value;
+ int ret;
acpi_processor_errata();
@@ -315,12 +355,12 @@ static int acpi_processor_get_info(struct acpi_device *device)
* NOTE: Even if the processor has a cpuid, it may not be present
* because cpuid <-> apicid mapping is persistent now.
*/
- if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
- int ret = acpi_processor_hotadd_init(pr);
-
- if (ret)
- return ret;
- }
+ if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id))
+ ret = acpi_processor_hotadd_init(pr, device);
+ else
+ ret = acpi_processor_set_per_cpu(pr, device);
+ if (ret)
+ return ret;
/*
* On some boxes several processors use the same processor bus id.
@@ -365,8 +405,6 @@ static int acpi_processor_get_info(struct acpi_device *device)
* (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
* Such things have to be put in and set up by the processor driver's .probe().
*/
-static DEFINE_PER_CPU(void *, processor_device_array);
-
static int acpi_processor_add(struct acpi_device *device,
const struct acpi_device_id *id)
{
@@ -395,28 +433,6 @@ static int acpi_processor_add(struct acpi_device *device,
if (result) /* Processor is not physically present or unavailable */
goto err_clear_driver_data;
- BUG_ON(pr->id >= nr_cpu_ids);
-
- /*
- * Buggy BIOS check.
- * ACPI id of processors can be reported wrongly by the BIOS.
- * Don't trust it blindly
- */
- if (per_cpu(processor_device_array, pr->id) != NULL &&
- per_cpu(processor_device_array, pr->id) != device) {
- dev_warn(&device->dev,
- "BIOS reported wrong ACPI id %d for the processor\n",
- pr->id);
- /* Give up, but do not abort the namespace scan. */
- goto err_clear_driver_data;
- }
- /*
- * processor_device_array is not cleared on errors to allow buggy BIOS
- * checks.
- */
- per_cpu(processor_device_array, pr->id) = device;
- per_cpu(processors, pr->id) = pr;
-
dev = get_cpu_device(pr->id);
if (!dev) {
result = -ENODEV;
@@ -470,10 +486,6 @@ static void acpi_processor_remove(struct acpi_device *device)
device_release_driver(pr->dev);
acpi_unbind_one(pr->dev);
- /* Clean up. */
- per_cpu(processor_device_array, pr->id) = NULL;
- per_cpu(processors, pr->id) = NULL;
-
cpu_maps_update_begin();
cpus_write_lock();
@@ -481,6 +493,10 @@ static void acpi_processor_remove(struct acpi_device *device)
arch_unregister_cpu(pr->id);
acpi_unmap_cpu(pr->id);
+ /* Clean up. */
+ per_cpu(processor_device_array, pr->id) = NULL;
+ per_cpu(processors, pr->id) = NULL;
+
cpus_write_unlock();
cpu_maps_update_done();
--
2.39.2
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