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SubjectRe: [PATCH v7 1/7] PCI/ATS: Fix pci_prg_resp_pasid_required() dependency issues
On Wed, Aug 28, 2019 at 03:14:01PM -0700, sathyanarayanan.kuppuswamy@linux.intel.com wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>
> Since pci_prg_resp_pasid_required() function has dependency on both
> PASID and PRI, define it only if both CONFIG_PCI_PRI and
> CONFIG_PCI_PASID config options are enabled.
>
> Fixes: e5567f5f6762 ("PCI/ATS: Add pci_prg_resp_pasid_required()
> interface.")

[Don't split tags, including "Fixes:" across lines]

This definitely doesn't fix e5567f5f6762. That commit added
pci_prg_resp_pasid_required(), but with no dependency on
CONFIG_PCI_PRI or CONFIG_PCI_PASID.

This patch is only required when a subsequent patch is applied. It
should be squashed into the commit that requires it so it's obvious
why it's needed.

I've been poking at this series, and I'll post a v8 soon with this and
other fixes.

> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> ---
> drivers/pci/ats.c | 10 ++++++----
> include/linux/pci-ats.h | 12 +++++++++---
> 2 files changed, 15 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
> index e18499243f84..cdd936d10f68 100644
> --- a/drivers/pci/ats.c
> +++ b/drivers/pci/ats.c
> @@ -395,6 +395,8 @@ int pci_pasid_features(struct pci_dev *pdev)
> }
> EXPORT_SYMBOL_GPL(pci_pasid_features);
>
> +#ifdef CONFIG_PCI_PRI
> +
> /**
> * pci_prg_resp_pasid_required - Return PRG Response PASID Required bit
> * status.
> @@ -402,10 +404,8 @@ EXPORT_SYMBOL_GPL(pci_pasid_features);
> *
> * Returns 1 if PASID is required in PRG Response Message, 0 otherwise.
> *
> - * Even though the PRG response PASID status is read from PRI Status
> - * Register, since this API will mainly be used by PASID users, this
> - * function is defined within #ifdef CONFIG_PCI_PASID instead of
> - * CONFIG_PCI_PRI.
> + * Since this API has dependency on both PRI and PASID, protect it
> + * with both CONFIG_PCI_PRI and CONFIG_PCI_PASID.
> */
> int pci_prg_resp_pasid_required(struct pci_dev *pdev)
> {
> @@ -425,6 +425,8 @@ int pci_prg_resp_pasid_required(struct pci_dev *pdev)
> }
> EXPORT_SYMBOL_GPL(pci_prg_resp_pasid_required);
>
> +#endif
> +
> #define PASID_NUMBER_SHIFT 8
> #define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT)
> /**
> diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
> index 1ebb88e7c184..1a0bdaee2f32 100644
> --- a/include/linux/pci-ats.h
> +++ b/include/linux/pci-ats.h
> @@ -40,7 +40,6 @@ void pci_disable_pasid(struct pci_dev *pdev);
> void pci_restore_pasid_state(struct pci_dev *pdev);
> int pci_pasid_features(struct pci_dev *pdev);
> int pci_max_pasids(struct pci_dev *pdev);
> -int pci_prg_resp_pasid_required(struct pci_dev *pdev);
>
> #else /* CONFIG_PCI_PASID */
>
> @@ -67,11 +66,18 @@ static inline int pci_max_pasids(struct pci_dev *pdev)
> return -EINVAL;
> }
>
> +#endif /* CONFIG_PCI_PASID */
> +
> +#if defined(CONFIG_PCI_PRI) && defined(CONFIG_PCI_PASID)
> +
> +int pci_prg_resp_pasid_required(struct pci_dev *pdev);
> +
> +#else /* CONFIG_PCI_PASID && CONFIG_PCI_PRI */
> +
> static inline int pci_prg_resp_pasid_required(struct pci_dev *pdev)
> {
> return 0;
> }
> -#endif /* CONFIG_PCI_PASID */
> -
> +#endif
>
> #endif /* LINUX_PCI_ATS_H*/
> --
> 2.21.0
>

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