linux-kernel - Re: [PATCH v5 3/7] PCI/ATS: Initialize PASID in pci_ats

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Date:   Wed, 14 Aug 2019 23:48:26 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     sathyanarayanan.kuppuswamy@...ux.intel.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com, keith.busch@...el.com
Subject: Re: [PATCH v5 3/7] PCI/ATS: Initialize PASID in pci_ats_init()

On Thu, Aug 01, 2019 at 05:06:00PM -0700, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> 
> Currently, PASID Capability checks are repeated across all PASID API's.
> Instead, cache the capability check result in pci_pasid_init() and use
> it in other PASID API's. Also, since PASID is a shared resource between
> PF/VF, initialize PASID features with default values in pci_pasid_init().
> 
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---
>  drivers/pci/ats.c       | 74 +++++++++++++++++++++++++++++------------
>  include/linux/pci-ats.h |  5 +++
>  include/linux/pci.h     |  1 +
>  3 files changed, 59 insertions(+), 21 deletions(-)
> 

> diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
> index 280be911f190..1f4be27a071d 100644
> --- a/drivers/pci/ats.c
> +++ b/drivers/pci/ats.c
> @@ -30,6 +30,8 @@ void pci_ats_init(struct pci_dev *dev)
>  	dev->ats_cap = pos;
>  
>  	pci_pri_init(dev);
> +
> +	pci_pasid_init(dev);
>  }
>  
>  /**
> @@ -315,6 +317,40 @@ EXPORT_SYMBOL_GPL(pci_reset_pri);
>  #endif /* CONFIG_PCI_PRI */
>  
>  #ifdef CONFIG_PCI_PASID
> +
> +void pci_pasid_init(struct pci_dev *pdev)
> +{
> ...
> +}

> diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
> index 33653d4ca94f..bc7f815d38ff 100644
> --- a/include/linux/pci-ats.h
> +++ b/include/linux/pci-ats.h
> @@ -40,6 +40,7 @@ static inline int pci_reset_pri(struct pci_dev *pdev)
>  
>  #ifdef CONFIG_PCI_PASID
>  
> +void pci_pasid_init(struct pci_dev *pdev);

This also looks like it should be static in ats.c.

>  int pci_enable_pasid(struct pci_dev *pdev, int features);
>  void pci_disable_pasid(struct pci_dev *pdev);
>  void pci_restore_pasid_state(struct pci_dev *pdev);
> @@ -48,6 +49,10 @@ int pci_max_pasids(struct pci_dev *pdev);
>  
>  #else  /* CONFIG_PCI_PASID */
>  
> +static inline void pci_pasid_init(struct pci_dev *pdev)
> +{
> +}
> +
>  static inline int pci_enable_pasid(struct pci_dev *pdev, int features)
>  {
>  	return -EINVAL;