linux-kernel - Re: [PATCH v4 03/11] iommu/ioasid: Introduce a helper to check for valid PASIDs

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Date:   Tue, 8 Feb 2022 10:40:49 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Joerg Roedel <joro@...tes.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>
Cc:     baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
        x86 <x86@...nel.org>, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 03/11] iommu/ioasid: Introduce a helper to check for
 valid PASIDs

On 2/8/22 7:02 AM, Fenghua Yu wrote:
> pasid_valid() is defined to check if a given PASID is valid.
> 
> Suggested-by: Ashok Raj <ashok.raj@...el.com>
> Suggested-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> v4:
> - Add "Reviewed-by: Thomas Gleixner <tglx@...utronix.de>" (Thomas).
> 
> v2:
> - Define a helper pasid_valid() (Ashok, Jacob, Thomas, Tony)
> 
>   include/linux/ioasid.h | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
> index e9dacd4b9f6b..2237f64dbaae 100644
> --- a/include/linux/ioasid.h
> +++ b/include/linux/ioasid.h
> @@ -41,6 +41,10 @@ void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
>   int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
>   void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
>   int ioasid_set_data(ioasid_t ioasid, void *data);
> +static inline bool pasid_valid(ioasid_t ioasid)
> +{
> +	return ioasid != INVALID_IOASID;
> +}
>   
>   #else /* !CONFIG_IOASID */
>   static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
> @@ -78,5 +82,10 @@ static inline int ioasid_set_data(ioasid_t ioasid, void *data)
>   	return -ENOTSUPP;
>   }
>   
> +static inline bool pasid_valid(ioasid_t ioasid)
> +{
> +	return false;
> +}
> +
>   #endif /* CONFIG_IOASID */
>   #endif /* __LINUX_IOASID_H */

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>

Best regards,
baolu