FROMLIST: iommu/arm-smmu: Use pm_runtime in fault handlers

[bibekpatro]

Commit d4a44f0 ("iommu/arm-smmu: Invoke pm_runtime across the driver") enabled pm_runtime for the arm-smmu device. On systems where the SMMU sits in a power domain, all register accesses must be done while the device is runtime active to avoid unclocked register reads and potential NoC errors.

So far, this has not been an issue for most SMMU clients because stall-on-fault is enabled by default. While a translation fault is being handled, the SMMU stalls further translations for that context bank, so the fault handler would not race with a powered-down SMMU.

Adreno SMMU now disables stall-on-fault in the presence of fault storms to avoid saturating SMMU resources and hanging the GMU. With stall-on-fault disabled, the SMMU can generate faults while its power domain may no longer be enabled, which makes unclocked accesses to fault-status registers in the SMMU fault handlers possible.

Guard the context and global fault handlers with pm_runtime_get_if_active() and pm_runtime_put_autosuspend() so that all SMMU fault register accesses are done with the SMMU powered. In case pm_runtime is not active we can safely ignore the fault as for pm runtime resume the smmu device is reset and fault registers are cleared.

Fixes: b130440 ("drm/msm: Temporarily disable stall-on-fault after a page fault")
Co-developed-by: Pratyush Brahma pratyush.brahma@oss.qualcomm.com

Link: https://lore.kernel.org/all/20260313-smmu-rpm-v2-1-8c2236b402b0@oss.qualcomm.com/
CRs-Fixed: 4063977

[qcomlnxci]

Test jobs on 9aa667a

• Job 68868 on lemans-evk
• Job 68865 on monaco-evk
• Job 68872 on qcs615-ride
• Job 68869 on qcs6490-rb3gen2
• Job 68866 on qcs8300-ride
• Job 68873 on qcs9100-ride-r3
• Job 68867 on sm8750-mtp

[qcomlnxci]

Test Matrix

Test Case	lemans-evk	monaco-evk	qcs615-ride	qcs6490-rb3gen2	qcs8300-ride	qcs9100-ride-r3	sm8750-mtp
BT_FW_KMD_Service	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
BT_ON_OFF	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
BT_SCAN	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
CPUFreq_Validation	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
CPU_affinity	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
DSP_AudioPD	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Ethernet	◻️	◻️	⚠️ skip	⚠️ skip	✅ Pass	⚠️ skip	◻️
Freq_Scaling	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
GIC	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
IPA	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Interrupts	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
OpenCV	◻️	◻️	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
PCIe	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Probe_Failure_Check	◻️	◻️	✅ Pass	❌ Fail	✅ Pass	❌ Fail	◻️
RMNET	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
UFS_Validation	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
USBHost	◻️	◻️	✅ Pass	❌ Fail	✅ Pass	✅ Pass	◻️
WiFi_Firmware_Driver	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
WiFi_OnOff	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
cdsp_remoteproc	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
hotplug	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
irq	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
kaslr	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
pinctrl	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
qcom_hwrng	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
remoteproc	◻️	◻️	✅ Pass	✅ Pass	❌ Fail	✅ Pass	◻️
rngtest	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
shmbridge	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
smmu	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
watchdog	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
wpss_remoteproc	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️

[qcomlnxci]

Test jobs on 9aa667a

• Job 68868 on lemans-evk
• Job 68865 on monaco-evk
• Job 68872 on qcs615-ride
• Job 68869 on qcs6490-rb3gen2
• Job 68866 on qcs8300-ride
• Job 68873 on qcs9100-ride-r3
• Job 68915 on sm8750-mtp

[qcomlnxci]

Test Matrix

Test Case	lemans-evk	monaco-evk	qcs615-ride	qcs6490-rb3gen2	qcs8300-ride	qcs9100-ride-r3	sm8750-mtp
0_qcom-next-ci-premerge-tests	◻️	◻️	◻️	◻️	◻️	◻️	❌ Fail
BT_FW_KMD_Service	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail
BT_ON_OFF	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	⚠️ skip
BT_SCAN	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
CPUFreq_Validation	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
CPU_affinity	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
DSP_AudioPD	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Ethernet	◻️	◻️	⚠️ skip	⚠️ skip	✅ Pass	⚠️ skip	⚠️ skip
Freq_Scaling	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail
GIC	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
IPA	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
Interrupts	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
OpenCV	◻️	◻️	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
PCIe	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
Probe_Failure_Check	◻️	◻️	✅ Pass	❌ Fail	✅ Pass	❌ Fail	❌ Fail
RMNET	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
UFS_Validation	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
USBHost	◻️	◻️	✅ Pass	❌ Fail	✅ Pass	✅ Pass	❌ Fail
WiFi_Firmware_Driver	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
WiFi_OnOff	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
cdsp_remoteproc	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail
hotplug	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
irq	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
kaslr	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
pinctrl	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
qcom_hwrng	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
remoteproc	◻️	◻️	✅ Pass	✅ Pass	❌ Fail	✅ Pass	❌ Fail
rngtest	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
shmbridge	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
smmu	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
watchdog	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
wpss_remoteproc	◻️	◻️	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass

[qcomlnxci]

Test jobs on 9aa667a

• Job 69377 on lemans-evk
• Job 69379 on monaco-evk
• Job 69381 on qcs615-ride
• Job 69380 on qcs6490-rb3gen2
• Job 69376 on qcs8300-ride
• Job 69378 on qcs9100-ride-r3
• Job 69382 on sm8750-mtp

[qcomlnxci]

Test Matrix

Test Case	lemans-evk	monaco-evk	qcs615-ride	qcs6490-rb3gen2	qcs8300-ride	qcs9100-ride-r3	sm8750-mtp
0_qcom-next-ci-premerge-tests	◻️	◻️	◻️	◻️	◻️	◻️	❌ Fail
BT_FW_KMD_Service	❌ Fail	❌ Fail	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail
BT_ON_OFF	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	⚠️ skip
BT_SCAN	✅ Pass	❌ Fail	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
CPUFreq_Validation	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
CPU_affinity	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
DSP_AudioPD	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
Ethernet	✅ Pass	✅ Pass	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip
Freq_Scaling	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail
GIC	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
IPA	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
Interrupts	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
OpenCV	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	⚠️ skip	◻️
PCIe	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
Probe_Failure_Check	❌ Fail	❌ Fail	✅ Pass	❌ Fail	❌ Fail	❌ Fail	❌ Fail
RMNET	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
UFS_Validation	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
USBHost	✅ Pass	✅ Pass	✅ Pass	❌ Fail	✅ Pass	✅ Pass	❌ Fail
WiFi_Firmware_Driver	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
WiFi_OnOff	✅ Pass	⚠️ skip	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
cdsp_remoteproc	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	❌ Fail
hotplug	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
irq	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
kaslr	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
pinctrl	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
qcom_hwrng	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
remoteproc	✅ Pass	❌ Fail	✅ Pass	✅ Pass	❌ Fail	✅ Pass	❌ Fail
rngtest	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
shmbridge	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
smmu	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass
watchdog	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	◻️
wpss_remoteproc	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass	✅ Pass