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SubjectBug: Re: [PATCH v3] ACPI: Split out processor thermal register from ACPI PSS
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Hi,

On 6/16/22 21:51, Riwen Lu wrote:
> From: Riwen Lu <luriwen@kylinos.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

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@kylinos.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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