Re: [PATCH] drm/xe/: Mutual Exclusivity b/w Multi CCS Mode & SRIOV VF Provisioning

[Nareshkumar Gollakoti <naresh.kumar.g@intel.com>]

In My Test check:
Although I attempted to acquire a lock within ccs_mode_store to ensure protection, 
a deadlock occurs because the lock has already been acquired earlier in the code flow before entering the function.
As a result, trying to acquire the same lock again inside ccsmode_store leads to a deadlock situation.

>>  	err = xe_sriov_pf_wait_ready(xe);
>>  	if (err)
>>  		goto out;
>> diff --git a/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h 
>> b/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h
>> index dd1df950b021..e26837091375 100644
>> --- a/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h
>> +++ b/drivers/gpu/drm/xe/xe_sriov_pf_helpers.h
>> @@ -43,4 +43,17 @@ static inline struct mutex *xe_sriov_pf_master_mutex(struct xe_device *xe)
>>  	return &xe->sriov.pf.master_lock;
>>  }
>>  
>> +/**
>> + * xe_sriov_pf_has_vfs_enabled() - Determines if the PF has any VFs 
>> +enabled
>> + * @xe: ptr to xe_device
>> + *
>> + * Return: true if one or more VFs are enabled on the PF, false otherwise.
>> + */
>> +static inline bool xe_sriov_pf_has_vfs_enabled(const struct xe_device 
>> +*xe) {
>> +	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
>> +
>> +	return pci_num_vf(pdev) > 0;
>> +}
>> +
>>  #endif