| Message ID | 20240417131909.7925-5-Jonathan.Cameron@huawei.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | ACPI/arm64: add support for virtual cpu hotplug | expand |
> From: Jonathan Cameron <jonathan.cameron@huawei.com> > Sent: Wednesday, April 17, 2024 2:19 PM > > 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). > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > v6: As per discussion in v5 thread, don't use the cpu->dev and > make this data available earlier by moving the assignment checks > int acpi_processor_get_info(). > --- > drivers/acpi/acpi_processor.c | 79 +++++++++++++++++++++-------------- > 1 file changed, 47 insertions(+), 32 deletions(-) > > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index ba0a6f0ac841..2c164451ab53 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -184,7 +184,35 @@ static void __init acpi_pcc_cpufreq_init(void) {} > > /* Initialization */ > #ifdef CONFIG_ACPI_HOTPLUG_CPU > -static int acpi_processor_hotadd_init(struct acpi_processor *pr) > +static DEFINE_PER_CPU(void *, processor_device_array); > + > +static void 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); > + /* Give up, but do not abort the namespace scan. */ > + return; > + } > + /* > + * 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; > +} > + > +static int acpi_processor_hotadd_init(struct acpi_processor *pr, > + struct acpi_device *device) > { > int ret; > > @@ -198,6 +226,8 @@ static int acpi_processor_hotadd_init(struct > acpi_processor *pr) > if (ret) > goto out; > > + acpi_processor_set_per_cpu(pr, device); > + > ret = arch_register_cpu(pr->id); > if (ret) { > acpi_unmap_cpu(pr->id); > @@ -217,7 +247,8 @@ 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 +263,7 @@ 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(); > > @@ -316,10 +348,12 @@ static int acpi_processor_get_info(struct > acpi_device *device) > * because cpuid <-> apicid mapping is persistent now. > */ > if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { > - int ret = acpi_processor_hotadd_init(pr); > + ret = acpi_processor_hotadd_init(pr, device); > > if (ret) > - return ret; > + goto err; > + } else { > + acpi_processor_set_per_cpu(pr, device); > } > > /* > @@ -357,6 +391,10 @@ static int acpi_processor_get_info(struct > acpi_device *device) > arch_fix_phys_package_id(pr->id, value); > > return 0; > + > +err: > + per_cpu(processors, pr->id) = NULL; > + return ret; > } > > /* > @@ -365,8 +403,6 @@ 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 +431,6 @@ static int acpi_processor_add(struct acpi_device > *device, > if (result) /* Processor is not physically present or unavailable */ > return 0; > > - 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; > - } > - /* > - * 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; > @@ -469,15 +483,16 @@ 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(); > > /* Remove the CPU. */ > arch_unregister_cpu(pr->id); > + > + /* Clean up. */ > + per_cpu(processor_device_array, pr->id) = NULL; > + per_cpu(processors, pr->id) = NULL; > + Shouldn't above change come after acpi_unmap_cpu() i.e. after next line? > acpi_unmap_cpu(pr->id); > > cpus_write_unlock(); > -- > 2.39.2
> > result = -ENODEV; > > @@ -469,15 +483,16 @@ 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(); > > > > /* Remove the CPU. */ > > arch_unregister_cpu(pr->id); > > + > > + /* Clean up. */ > > + per_cpu(processor_device_array, pr->id) = NULL; > > + per_cpu(processors, pr->id) = NULL; > > + > > > Shouldn't above change come after acpi_unmap_cpu() i.e. after next line? > > > > acpi_unmap_cpu(pr->id); Agreed - that is more logically correct. I'll move it for v7. Thanks, Jonathan
On Wed, 17 Apr 2024 14:18:57 +0100 Jonathan Cameron <Jonathan.Cameron@huawei.com> wrote: > 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). > > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > v6: As per discussion in v5 thread, don't use the cpu->dev and > make this data available earlier by moving the assignment checks > int acpi_processor_get_info(). > --- > drivers/acpi/acpi_processor.c | 79 +++++++++++++++++++++-------------- > 1 file changed, 47 insertions(+), 32 deletions(-) > > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index ba0a6f0ac841..2c164451ab53 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -184,7 +184,35 @@ static void __init acpi_pcc_cpufreq_init(void) {} > > /* Initialization */ > #ifdef CONFIG_ACPI_HOTPLUG_CPU Note I messed up a rebase here. This ifdef should come after the new function (see later) Will fix for v7. > -static int acpi_processor_hotadd_init(struct acpi_processor *pr) > +static DEFINE_PER_CPU(void *, processor_device_array); > + > +static void 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); > + /* Give up, but do not abort the namespace scan. */ > + return; > + } > + /* > + * 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; > +} > + The ifdef should be here as... > +static int acpi_processor_hotadd_init(struct acpi_processor *pr, > + struct acpi_device *device) > { > int ret; > > @@ -198,6 +226,8 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr) > if (ret) > goto out; > > + acpi_processor_set_per_cpu(pr, device); > + > ret = arch_register_cpu(pr->id); > if (ret) { > acpi_unmap_cpu(pr->id); > @@ -217,7 +247,8 @@ 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 +263,7 @@ 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(); > > @@ -316,10 +348,12 @@ static int acpi_processor_get_info(struct acpi_device *device) > * because cpuid <-> apicid mapping is persistent now. > */ > if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { > - int ret = acpi_processor_hotadd_init(pr); > + ret = acpi_processor_hotadd_init(pr, device); > > if (ret) > - return ret; > + goto err; > + } else { > + acpi_processor_set_per_cpu(pr, device); This is not covered by CONFIG_ACPI_HOTPLUG_CPU > }
diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c index ba0a6f0ac841..2c164451ab53 100644 --- a/drivers/acpi/acpi_processor.c +++ b/drivers/acpi/acpi_processor.c @@ -184,7 +184,35 @@ static void __init acpi_pcc_cpufreq_init(void) {} /* Initialization */ #ifdef CONFIG_ACPI_HOTPLUG_CPU -static int acpi_processor_hotadd_init(struct acpi_processor *pr) +static DEFINE_PER_CPU(void *, processor_device_array); + +static void 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); + /* Give up, but do not abort the namespace scan. */ + return; + } + /* + * 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; +} + +static int acpi_processor_hotadd_init(struct acpi_processor *pr, + struct acpi_device *device) { int ret; @@ -198,6 +226,8 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr) if (ret) goto out; + acpi_processor_set_per_cpu(pr, device); + ret = arch_register_cpu(pr->id); if (ret) { acpi_unmap_cpu(pr->id); @@ -217,7 +247,8 @@ 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 +263,7 @@ 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(); @@ -316,10 +348,12 @@ static int acpi_processor_get_info(struct acpi_device *device) * because cpuid <-> apicid mapping is persistent now. */ if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) { - int ret = acpi_processor_hotadd_init(pr); + ret = acpi_processor_hotadd_init(pr, device); if (ret) - return ret; + goto err; + } else { + acpi_processor_set_per_cpu(pr, device); } /* @@ -357,6 +391,10 @@ static int acpi_processor_get_info(struct acpi_device *device) arch_fix_phys_package_id(pr->id, value); return 0; + +err: + per_cpu(processors, pr->id) = NULL; + return ret; } /* @@ -365,8 +403,6 @@ 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 +431,6 @@ static int acpi_processor_add(struct acpi_device *device, if (result) /* Processor is not physically present or unavailable */ return 0; - 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; - } - /* - * 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; @@ -469,15 +483,16 @@ 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(); /* Remove the CPU. */ arch_unregister_cpu(pr->id); + + /* Clean up. */ + per_cpu(processor_device_array, pr->id) = NULL; + per_cpu(processors, pr->id) = NULL; + acpi_unmap_cpu(pr->id); cpus_write_unlock();
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). Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> --- v6: As per discussion in v5 thread, don't use the cpu->dev and make this data available earlier by moving the assignment checks int acpi_processor_get_info(). --- drivers/acpi/acpi_processor.c | 79 +++++++++++++++++++++-------------- 1 file changed, 47 insertions(+), 32 deletions(-)