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Date: Sat, 20 Aug 2022 14:20:45 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Jeremy Linton <jeremy.linton@....com>
Cc: Riwen Lu <luriwen@...mail.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
"Zhang, Rui" <rui.zhang@...el.com>,
Robert Moore <robert.moore@...el.com>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>,
Punit Agrawal <punit.agrawal@...edance.com>,
Riwen Lu <luriwen@...inos.cn>
Subject: Re: Bug: Re: [PATCH v3] ACPI: Split out processor thermal register
from ACPI PSS
On Thu, Aug 18, 2022 at 10:23 PM Jeremy Linton <jeremy.linton@....com> wrote:
>
> Hi,
>
> On 6/16/22 21:51, Riwen Lu wrote:
> > From: Riwen Lu <luriwen@...inos.cn>
> >
> > Commit 239708a3af44 ("ACPI: Split out ACPI PSS from ACPI Processor
> > driver"), moves processor thermal registration to acpi_pss_perf_init(),
> > which doesn't get executed if ACPI_CPU_FREQ_PSS is not enabled.
> >
> > As ARM64 supports P-states using CPPC, it should be possible to also
> > support processor passive cooling even if PSS is not enabled. Split
> > out the processor thermal cooling register from ACPI PSS to support
> > this, and move it into a separate function in processor_thermal.c.
>
> It appears this commit 7fdc74da940d ACPI: processor: Split out thermal
> initialization from ACPI PSS
I've just reverted the above commit, thanks for the report!
> Is causing the following:
> 41.341659] ------------[ cut here ]------------
> [ 41.346280] freq_qos_remove_request() called for unknown object
> [ 41.352251] WARNING: CPU: 3 PID: 1089 at kernel/power/qos.c:597
> freq_qos_remove_request+0xa4/0xc4
> [ 41.361152] Modules linked in: nf_nat_tftp nft_objref
> nf_conntrack_tftp nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib
> nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct
> nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set
> nf_tables nfnetlink qrtr bnep sunrpc vfat fat btsdio brcmfmac hci_uart
> btqca cfg80211 bs
> [ 41.413245] CPU: 3 PID: 1089 Comm: rmmod Not tainted 6.0.0-rc1MINI+ #237
> [ 41.419951] Hardware name: Raspberry Pi Foundation Raspberry Pi 4
> Model B/Raspberry Pi 4 Model B, BIOS EDK2-DEV 07/18/2022
> [ 41.430990] pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS
> BTYPE=--)
> [ 41.437955] pc : freq_qos_remove_request+0xa4/0xc4
> [ 41.442752] lr : freq_qos_remove_request+0xa4/0xc4
> [ 41.447550] sp : ffff80000a4bbb60
> [ 41.450862] x29: ffff80000a4bbb60 x28: ffff07858798a1c0 x27:
> 0000000000000000
> [ 41.458012] x26: 0000000000000000 x25: ffffdf6ade80f850 x24:
> ffff07858b07d200
> [ 41.465158] x23: ffffdf6ade812cb0 x22: ffff07858b07d000 x21:
> ffffdf6ade80f850
> [ 41.472303] x20: ffffdf6ade26b998 x19: ffff0785809ba5a8 x18:
> ffffffffffffffff
> [ 41.479447] x17: 0000000000000000 x16: ffffdf6adcc25320 x15:
> 0000000000000006
> [ 41.486592] x14: 0000000000000000 x13: 7463656a626f206e x12:
> 776f6e6b6e752072
> [ 41.493736] x11: 00000000ffffdfff x10: ffffdf6ade8fd520 x9 :
> ffffdf6adcae53ac
> [ 41.500881] x8 : 000000000002ffe8 x7 : c0000000ffffdfff x6 :
> 0000000000000001
> [ 41.508026] x5 : 0000000000000000 x4 : ffff07863b7ac450 x3 :
> ffff07863b7b8bb0
> [ 41.515170] x2 : 0000000000000001 x1 : ffff281b5d54f000 x0 :
> 0000000000000033
> [ 41.522315] Call trace:
> [ 41.524759] freq_qos_remove_request+0xa4/0xc4
> [ 41.529210] acpi_thermal_cpufreq_exit+0x90/0xb0
> [ 41.533834] acpi_processor_notifier+0x74/0x90
> [ 41.538281] blocking_notifier_call_chain+0x78/0xb0
> [ 41.543161] cpufreq_policy_free+0x154/0x1e0
> [ 41.547438] cpufreq_remove_dev+0xc0/0x10c
> [ 41.551538] subsys_interface_unregister+0xf0/0xfc
> [ 41.556335] cpufreq_unregister_driver+0x54/0x120
> [ 41.561043] cppc_cpufreq_exit+0x28/0xd2c [cppc_cpufreq]
> [ 41.566370] __do_sys_delete_module.constprop.0+0x150/0x2bc
> [ 41.571947] __arm64_sys_delete_module+0x20/0x30
> [ 41.576567] invoke_syscall+0x50/0x120
> [ 41.580318] el0_svc_common.constprop.0+0x4c/0xf4
> [ 41.585023] do_el0_svc+0x38/0x4c
> [ 41.588338] el0_svc+0x34/0xdc
> [ 41.591394] el0t_64_sync_handler+0x11c/0x150
> [ 41.595752] el0t_64_sync+0x190/0x194
> [ 41.599416] ---[ end trace 0000000000000000 ]---
>
> When the cppc_cpufreq driver is rmmod'ed from a running machine that has
> both CPPC and a thermal zone. I reverted and bisected it, and in both
> cases the splat above goes away.
>
>
> Thanks,
>
> >
> > Signed-off-by: Riwen Lu <luriwen@...inos.cn>
> >
> > ---
> > v1 -> v2:
> > - Reword the commit message.
> > - Update the signature of acpi_pss_perf_init() to void, and remove the
> > acpi_device parameter.
> > - Move the processor thermal register/remove into a separate function in
> > processor_thermal.c.
> >
> > v2 -> v3:
> > - Remove the "pr" NULL check in processor thermal init/exit fuction.
> > - Pass the acpi_device into processor thermal init/exit, and remove the
> > convert in it.
> > ---
> > drivers/acpi/Kconfig | 2 +-
> > drivers/acpi/Makefile | 5 +--
> > drivers/acpi/processor_driver.c | 72 ++++----------------------------
> > drivers/acpi/processor_thermal.c | 54 ++++++++++++++++++++++++
> > include/acpi/processor.h | 8 +++-
> > 5 files changed, 71 insertions(+), 70 deletions(-)
> >
> > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> > index 1e34f846508f..2457ade3f82d 100644
> > --- a/drivers/acpi/Kconfig
> > +++ b/drivers/acpi/Kconfig
> > @@ -255,7 +255,6 @@ config ACPI_DOCK
> >
> > config ACPI_CPU_FREQ_PSS
> > bool
> > - select THERMAL
> >
> > config ACPI_PROCESSOR_CSTATE
> > def_bool y
> > @@ -287,6 +286,7 @@ config ACPI_PROCESSOR
> > depends on X86 || IA64 || ARM64 || LOONGARCH
> > select ACPI_PROCESSOR_IDLE
> > select ACPI_CPU_FREQ_PSS if X86 || IA64 || LOONGARCH
> > + select THERMAL
> > default y
> > help
> > This driver adds support for the ACPI Processor package. It is required
> > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> > index b5a8d3e00a52..0002eecbf870 100644
> > --- a/drivers/acpi/Makefile
> > +++ b/drivers/acpi/Makefile
> > @@ -109,10 +109,9 @@ obj-$(CONFIG_ACPI_PPTT) += pptt.o
> > obj-$(CONFIG_ACPI_PFRUT) += pfr_update.o pfr_telemetry.o
> >
> > # processor has its own "processor." module_param namespace
> > -processor-y := processor_driver.o
> > +processor-y := processor_driver.o processor_thermal.o
> > processor-$(CONFIG_ACPI_PROCESSOR_IDLE) += processor_idle.o
> > -processor-$(CONFIG_ACPI_CPU_FREQ_PSS) += processor_throttling.o \
> > - processor_thermal.o
> > +processor-$(CONFIG_ACPI_CPU_FREQ_PSS) += processor_throttling.o
> > processor-$(CONFIG_CPU_FREQ) += processor_perflib.o
> >
> > obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
> > diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> > index 368a9edefd0c..1278969eec1f 100644
> > --- a/drivers/acpi/processor_driver.c
> > +++ b/drivers/acpi/processor_driver.c
> > @@ -139,75 +139,17 @@ static int acpi_soft_cpu_dead(unsigned int cpu)
> > }
> >
> > #ifdef CONFIG_ACPI_CPU_FREQ_PSS
> > -static int acpi_pss_perf_init(struct acpi_processor *pr,
> > - struct acpi_device *device)
> > +static void acpi_pss_perf_init(struct acpi_processor *pr)
> > {
> > - int result = 0;
> > -
> > acpi_processor_ppc_has_changed(pr, 0);
> >
> > acpi_processor_get_throttling_info(pr);
> >
> > if (pr->flags.throttling)
> > pr->flags.limit = 1;
> > -
> > - pr->cdev = thermal_cooling_device_register("Processor", device,
> > - &processor_cooling_ops);
> > - if (IS_ERR(pr->cdev)) {
> > - result = PTR_ERR(pr->cdev);
> > - return result;
> > - }
> > -
> > - dev_dbg(&device->dev, "registered as cooling_device%d\n",
> > - pr->cdev->id);
> > -
> > - result = sysfs_create_link(&device->dev.kobj,
> > - &pr->cdev->device.kobj,
> > - "thermal_cooling");
> > - if (result) {
> > - dev_err(&device->dev,
> > - "Failed to create sysfs link 'thermal_cooling'\n");
> > - goto err_thermal_unregister;
> > - }
> > -
> > - result = sysfs_create_link(&pr->cdev->device.kobj,
> > - &device->dev.kobj,
> > - "device");
> > - if (result) {
> > - dev_err(&pr->cdev->device,
> > - "Failed to create sysfs link 'device'\n");
> > - goto err_remove_sysfs_thermal;
> > - }
> > -
> > - return 0;
> > -
> > - err_remove_sysfs_thermal:
> > - sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
> > - err_thermal_unregister:
> > - thermal_cooling_device_unregister(pr->cdev);
> > -
> > - return result;
> > -}
> > -
> > -static void acpi_pss_perf_exit(struct acpi_processor *pr,
> > - struct acpi_device *device)
> > -{
> > - if (pr->cdev) {
> > - sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
> > - sysfs_remove_link(&pr->cdev->device.kobj, "device");
> > - thermal_cooling_device_unregister(pr->cdev);
> > - pr->cdev = NULL;
> > - }
> > }
> > #else
> > -static inline int acpi_pss_perf_init(struct acpi_processor *pr,
> > - struct acpi_device *device)
> > -{
> > - return 0;
> > -}
> > -
> > -static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
> > - struct acpi_device *device) {}
> > +static inline void acpi_pss_perf_init(struct acpi_processor *pr) {}
> > #endif /* CONFIG_ACPI_CPU_FREQ_PSS */
> >
> > static int __acpi_processor_start(struct acpi_device *device)
> > @@ -229,7 +171,9 @@ static int __acpi_processor_start(struct acpi_device *device)
> > if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
> > acpi_processor_power_init(pr);
> >
> > - result = acpi_pss_perf_init(pr, device);
> > + acpi_pss_perf_init(pr);
> > +
> > + result = acpi_processor_thermal_init(pr, device);
> > if (result)
> > goto err_power_exit;
> >
> > @@ -239,7 +183,7 @@ static int __acpi_processor_start(struct acpi_device *device)
> > return 0;
> >
> > result = -ENODEV;
> > - acpi_pss_perf_exit(pr, device);
> > + acpi_processor_thermal_exit(pr, device);
> >
> > err_power_exit:
> > acpi_processor_power_exit(pr);
> > @@ -277,10 +221,10 @@ static int acpi_processor_stop(struct device *dev)
> > return 0;
> > acpi_processor_power_exit(pr);
> >
> > - acpi_pss_perf_exit(pr, device);
> > -
> > acpi_cppc_processor_exit(pr);
> >
> > + acpi_processor_thermal_exit(pr, device);
> > +
> > return 0;
> > }
> >
> > diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
> > index d8b2dfcd59b5..db6ac540e924 100644
> > --- a/drivers/acpi/processor_thermal.c
> > +++ b/drivers/acpi/processor_thermal.c
> > @@ -266,3 +266,57 @@ const struct thermal_cooling_device_ops processor_cooling_ops = {
> > .get_cur_state = processor_get_cur_state,
> > .set_cur_state = processor_set_cur_state,
> > };
> > +
> > +int acpi_processor_thermal_init(struct acpi_processor *pr,
> > + struct acpi_device *device)
> > +{
> > + int result = 0;
> > +
> > + pr->cdev = thermal_cooling_device_register("Processor", device,
> > + &processor_cooling_ops);
> > + if (IS_ERR(pr->cdev)) {
> > + result = PTR_ERR(pr->cdev);
> > + return result;
> > + }
> > +
> > + dev_dbg(&device->dev, "registered as cooling_device%d\n",
> > + pr->cdev->id);
> > +
> > + result = sysfs_create_link(&device->dev.kobj,
> > + &pr->cdev->device.kobj,
> > + "thermal_cooling");
> > + if (result) {
> > + dev_err(&device->dev,
> > + "Failed to create sysfs link 'thermal_cooling'\n");
> > + goto err_thermal_unregister;
> > + }
> > +
> > + result = sysfs_create_link(&pr->cdev->device.kobj,
> > + &device->dev.kobj,
> > + "device");
> > + if (result) {
> > + dev_err(&pr->cdev->device,
> > + "Failed to create sysfs link 'device'\n");
> > + goto err_remove_sysfs_thermal;
> > + }
> > +
> > + return 0;
> > +
> > +err_remove_sysfs_thermal:
> > + sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
> > +err_thermal_unregister:
> > + thermal_cooling_device_unregister(pr->cdev);
> > +
> > + return result;
> > +}
> > +
> > +void acpi_processor_thermal_exit(struct acpi_processor *pr,
> > + struct acpi_device *device)
> > +{
> > + if (pr->cdev) {
> > + sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
> > + sysfs_remove_link(&pr->cdev->device.kobj, "device");
> > + thermal_cooling_device_unregister(pr->cdev);
> > + pr->cdev = NULL;
> > + }
> > +}
> > diff --git a/include/acpi/processor.h b/include/acpi/processor.h
> > index 194027371928..ba1e3ed98d3d 100644
> > --- a/include/acpi/processor.h
> > +++ b/include/acpi/processor.h
> > @@ -442,8 +442,12 @@ static inline int acpi_processor_hotplug(struct acpi_processor *pr)
> >
> > /* in processor_thermal.c */
> > int acpi_processor_get_limit_info(struct acpi_processor *pr);
> > +int acpi_processor_thermal_init(struct acpi_processor *pr,
> > + struct acpi_device *device);
> > +void acpi_processor_thermal_exit(struct acpi_processor *pr,
> > + struct acpi_device *device);
> > extern const struct thermal_cooling_device_ops processor_cooling_ops;
> > -#if defined(CONFIG_ACPI_CPU_FREQ_PSS) & defined(CONFIG_CPU_FREQ)
> > +#ifdef CONFIG_CPU_FREQ
> > void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy);
> > void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy);
> > #else
> > @@ -455,6 +459,6 @@ static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
> > {
> > return;
> > }
> > -#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
> > +#endif /* CONFIG_CPU_FREQ */
> >
> > #endif
>
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