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Date:   Wed, 16 Nov 2022 10:27:05 -0600
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     LKML <linux-kernel@vger.kernel.org>, x86@kernel.org,
        Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
        linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Marc Zyngier <maz@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jason Gunthorpe <jgg@mellanox.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Kevin Tian <kevin.tian@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Ashok Raj <ashok.raj@intel.com>, Jon Mason <jdmason@kudzu.us>,
        Allen Hubbe <allenbh@gmail.com>,
        "Ahmed S. Darwish" <darwi@linutronix.de>,
        Reinette Chatre <reinette.chatre@intel.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        linuxppc-dev@lists.ozlabs.org
Subject: Re: [patch 30/39] PCI/MSI: Move pci_msi_restore_state() to api.c
Message-ID: <20221116162705.GA1115960@bhelgaas>
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In-Reply-To: <20221111122015.331584998@linutronix.de>
Precedence: bulk

On Fri, Nov 11, 2022 at 02:55:03PM +0100, Thomas Gleixner wrote:
> From: Ahmed S. Darwish <darwi@linutronix.de>
>     
> To distangle the maze in msi.c, all exported device-driver MSI APIs are
> now to be grouped in one file, api.c.
>     
> Move pci_msi_enabled() and add kernel-doc for the function.
>     
> Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> diff --git a/drivers/pci/msi/api.c b/drivers/pci/msi/api.c
> index ee9ed5ccd94d..8d1cf6db9bd7 100644
> --- a/drivers/pci/msi/api.c
> +++ b/drivers/pci/msi/api.c
> @@ -308,6 +308,21 @@ void pci_free_irq_vectors(struct pci_dev *dev)
>  }
>  EXPORT_SYMBOL(pci_free_irq_vectors);
>  
> +/**
> + * pci_restore_msi_state() - Restore cached MSI(-X) state on device
> + * @dev: the PCI device to operate on
> + *
> + * Write the Linux-cached MSI(-X) state back on device. This is
> + * typically useful upon system resume, or after an error-recovery PCI
> + * adapter reset.
> + */
> +void pci_restore_msi_state(struct pci_dev *dev)
> +{
> +	__pci_restore_msi_state(dev);
> +	__pci_restore_msix_state(dev);
> +}
> +EXPORT_SYMBOL_GPL(pci_restore_msi_state);
> +
>  /**
>   * pci_msi_enabled() - Are MSI(-X) interrupts enabled system-wide?
>   *
> diff --git a/drivers/pci/msi/msi.c b/drivers/pci/msi/msi.c
> index 59c33bc7fe81..a5d168c823ff 100644
> --- a/drivers/pci/msi/msi.c
> +++ b/drivers/pci/msi/msi.c
> @@ -199,7 +199,7 @@ bool __weak arch_restore_msi_irqs(struct pci_dev *dev)
>  	return true;
>  }
>  
> -static void __pci_restore_msi_state(struct pci_dev *dev)
> +void __pci_restore_msi_state(struct pci_dev *dev)
>  {
>  	struct msi_desc *entry;
>  	u16 control;
> @@ -231,7 +231,7 @@ static void pci_msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
>  	pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
>  }
>  
> -static void __pci_restore_msix_state(struct pci_dev *dev)
> +void __pci_restore_msix_state(struct pci_dev *dev)
>  {
>  	struct msi_desc *entry;
>  	bool write_msg;
> @@ -257,13 +257,6 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
>  	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
>  }
>  
> -void pci_restore_msi_state(struct pci_dev *dev)
> -{
> -	__pci_restore_msi_state(dev);
> -	__pci_restore_msix_state(dev);
> -}
> -EXPORT_SYMBOL_GPL(pci_restore_msi_state);
> -
>  static void pcim_msi_release(void *pcidev)
>  {
>  	struct pci_dev *dev = pcidev;
> diff --git a/drivers/pci/msi/msi.h b/drivers/pci/msi/msi.h
> index f3f4ede53171..8170ef2c5ad0 100644
> --- a/drivers/pci/msi/msi.h
> +++ b/drivers/pci/msi/msi.h
> @@ -94,6 +94,8 @@ void pci_free_msi_irqs(struct pci_dev *dev);
>  int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
>  int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec,
>  			    int maxvec,  struct irq_affinity *affd, int flags);
> +void __pci_restore_msi_state(struct pci_dev *dev);
> +void __pci_restore_msix_state(struct pci_dev *dev);
>  
>  /* Legacy (!IRQDOMAIN) fallbacks */
>  
>