Re: Dell XPS 13 9360: `slp_s0_residency_usec` stays 0

[Mario Limonciello <mario.limonciello@amd.com>]

On 5/22/2024 10:52, Paul Menzel wrote:
> [attached output of `dmesg`, no other changes to original message]
> 
> 
> Dear Linux folks,
> 
> 
> On the Intel Kaby Lake laptop Dell XPS 13 9360, 
> `/sys/kernel/debug/pmc_core/slp_s0_residency_usec` does stay 0 even 
> after a s2idle suspend/resume cycle.

It won't change your numbers but FWIW you can also read from

$ cat /sys/power/suspend_stats/last_hw_sleep

which is also accessible under kernel lockdown.

> 
>      $ sudo dmesg
>      […]
>      [    0.000000] DMI: Dell Inc. XPS 13 9360/0596KF, BIOS 2.21.0 
> 06/02/2022
>      […]
>      [10176.745124] PM: suspend entry (s2idle)
>      [10176.757275] Filesystems sync: 0.012 seconds
>      [10176.769118] Freezing user space processes
>      [10176.771693] Freezing user space processes completed (elapsed 
> 0.002 seconds)
>      [10176.771710] OOM killer disabled.
>      [10176.771714] Freezing remaining freezable tasks
>      [10176.773487] Freezing remaining freezable tasks completed 
> (elapsed 0.001 seconds)
>      [10176.773504] printk: Suspending console(s) (use 
> no_console_suspend to debug)
>      [10176.948337] ACPI: EC: interrupt blocked
>      [10176.951016] intel_pch_thermal 0000:00:14.2: CPU-PCH is cool [48C]
>      [10181.281827] ACPI: EC: interrupt unblocked
>      $ sudo more /sys/kernel/debug/pmc_core/slp_s0_residency_usec
>      0
> 
> Is that expected?

Is it a regression?  If so; probably it's worth bisecting.

If it's not a regression IIUC you should probably run 
https://github.com/intel/S0ixSelftestTool for assistance in next steps 
on debugging why this is happening.

> 
> 
> Kind regards,
> 
> Paul
> 
> 
> PS: Some system details:
> 
> ```
> $ LANG= lspci -nn
> 00:00.0 Host bridge [0600]: Intel Corporation Xeon E3-1200 v6/7th Gen 
> Core Processor Host Bridge/DRAM Registers [8086:5904] (rev 02)
> 00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 
> 620 [8086:5916] (rev 02)
> 00:04.0 Signal processing controller [1180]: Intel Corporation Xeon 
> E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem 
> [8086:1903] (rev 02)
> 00:14.0 USB controller [0c03]: Intel Corporation Sunrise Point-LP USB 
> 3.0 xHCI Controller [8086:9d2f] (rev 21)
> 00:14.2 Signal processing controller [1180]: Intel Corporation Sunrise 
> Point-LP Thermal subsystem [8086:9d31] (rev 21)
> 00:15.0 Signal processing controller [1180]: Intel Corporation Sunrise 
> Point-LP Serial IO I2C Controller #0 [8086:9d60] (rev 21)
> 00:15.1 Signal processing controller [1180]: Intel Corporation Sunrise 
> Point-LP Serial IO I2C Controller #1 [8086:9d61] (rev 21)
> 00:16.0 Communication controller [0780]: Intel Corporation Sunrise 
> Point-LP CSME HECI #1 [8086:9d3a] (rev 21)
> 00:1c.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
> Express Root Port #1 [8086:9d10] (rev f1)
> 00:1c.4 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
> Express Root Port #5 [8086:9d14] (rev f1)
> 00:1d.0 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI 
> Express Root Port #9 [8086:9d18] (rev f1)
> 00:1f.0 ISA bridge [0601]: Intel Corporation Sunrise Point-LP LPC 
> Controller [8086:9d58] (rev 21)
> 00:1f.2 Memory controller [0580]: Intel Corporation Sunrise Point-LP PMC 
> [8086:9d21] (rev 21)
> 00:1f.3 Audio device [0403]: Intel Corporation Sunrise Point-LP HD Audio 
> [8086:9d71] (rev 21)
> 00:1f.4 SMBus [0c05]: Intel Corporation Sunrise Point-LP SMBus 
> [8086:9d23] (rev 21)
> 01:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
> Bridge [Alpine Ridge 2C 2015] [8086:1576]
> 02:00.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
> Bridge [Alpine Ridge 2C 2015] [8086:1576]
> 02:01.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
> Bridge [Alpine Ridge 2C 2015] [8086:1576]
> 02:02.0 PCI bridge [0604]: Intel Corporation DSL6340 Thunderbolt 3 
> Bridge [Alpine Ridge 2C 2015] [8086:1576]
> 39:00.0 USB controller [0c03]: Intel Corporation DSL6340 USB 3.1 
> Controller [Alpine Ridge] [8086:15b5]
> 3a:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac 
> Wireless Network Adapter [168c:003e] (rev 32)
> 3b:00.0 Non-Volatile memory controller [0108]: SK hynix PC300 NVMe Solid 
> State Drive 512GB [1c5c:1284]
> $ LANG= lscpu
> Architecture:             x86_64
>    CPU op-mode(s):         32-bit, 64-bit
>    Address sizes:          39 bits physical, 48 bits virtual
>    Byte Order:             Little Endian
> CPU(s):                   4
>    On-line CPU(s) list:    0-3
> Vendor ID:                GenuineIntel
>    Model name:             Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
>      CPU family:           6
>      Model:                142
>      Thread(s) per core:   2
>      Core(s) per socket:   2
>      Socket(s):            1
>      Stepping:             9
>      CPU(s) scaling MHz:   14%
>      CPU max MHz:          3500.0000
>      CPU min MHz:          400.0000
>      BogoMIPS:             5799.77
>      Flags:                fpu vme de pse tsc msr pae mce cx8 apic sep 
> mtrr pge mca cmov
>                             pat pse36 clflush dts acpi mmx fxsr sse sse2 
> ss ht tm pbe sy
>                            scall nx pdpe1gb rdtscp lm constant_tsc art 
> arch_perfmon pebs
>                             bts rep_good nopl xtopology nonstop_tsc 
> cpuid aperfmperf pni
>                             pclmulqdq dtes64 monitor ds_cpl vmx est tm2 
> ssse3 sdbg fma c
>                            x16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe 
> popcnt tsc_dead
>                            line_timer aes xsave avx f16c rdrand lahf_lm 
> abm 3dnowprefetc
>                            h cpuid_fault epb ssbd ibrs ibpb stibp 
> tpr_shadow flexpriorit
>                            y ept vpid ept_ad fsgsbase tsc_adjust sgx 
> bmi1 avx2 smep bmi2
>                             erms invpcid mpx rdseed adx smap clflushopt 
> intel_pt xsaveop
>                            t xsavec xgetbv1 xsaves dtherm ida arat pln 
> pts hwp hwp_notif
>                            y hwp_act_window hwp_epp vnmi md_clear 
> flush_l1d arch_capabil
>                            ities
> Virtualization features:
>    Virtualization:         VT-x
> Caches (sum of all):
>    L1d:                    64 KiB (2 instances)
>    L1i:                    64 KiB (2 instances)
>    L2:                     512 KiB (2 instances)
>    L3:                     4 MiB (1 instance)
> NUMA:
>    NUMA node(s):           1
>    NUMA node0 CPU(s):      0-3
> Vulnerabilities:
>    Gather data sampling:   Vulnerable
>    Itlb multihit:          KVM: Mitigation: VMX disabled
>    L1tf:                   Mitigation; PTE Inversion; VMX vulnerable
>    Mds:                    Vulnerable; SMT vulnerable
>    Meltdown:               Vulnerable
>    Mmio stale data:        Vulnerable
>    Reg file data sampling: Not affected
>    Retbleed:               Vulnerable
>    Spec rstack overflow:   Not affected
>    Spec store bypass:      Vulnerable
>    Spectre v1:             Vulnerable: __user pointer sanitization and 
> usercopy barriers
>                             only; no swapgs barriers
>    Spectre v2:             Vulnerable; IBPB: disabled; STIBP: disabled; 
> PBRSB-eIBRS: Not
>                             affected; BHI: Not affected
>    Srbds:                  Vulnerable
>    Tsx async abort:        Not affected
> ```