linux-kernel - Re: [PATCH 09/32] s390/pci: export some routines related to RPCIT processing

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Message-ID: <db120635-01fe-eef8-611a-44fb7ad83d03@linux.ibm.com>
Date:   Thu, 9 Dec 2021 16:20:55 +0100
From:   Christian Borntraeger <borntraeger@...ux.ibm.com>
To:     Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc:     alex.williamson@...hat.com, cohuck@...hat.com,
        schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com,
        gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
        frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
        vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com,
        thuth@...hat.com, pasic@...ux.ibm.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/32] s390/pci: export some routines related to RPCIT
 processing



Am 07.12.21 um 21:57 schrieb Matthew Rosato:
> KVM will re-use dma_walk_cpu_trans to walk the host shadow table and
> will also need to be able to call zpci_refresh_trans to re-issue a RPCIT.
> 
> Reviewed-by: Niklas Schnelle <schnelle@...ux.ibm.com>
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>

Makes sense

Acked-by: Christian Borntraeger <borntraeger@...ibm.com>

> ---
>   arch/s390/pci/pci_dma.c  | 1 +
>   arch/s390/pci/pci_insn.c | 1 +
>   2 files changed, 2 insertions(+)
> 
> diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
> index 1f4540d6bd2d..ae55f2f2ecd9 100644
> --- a/arch/s390/pci/pci_dma.c
> +++ b/arch/s390/pci/pci_dma.c
> @@ -116,6 +116,7 @@ unsigned long *dma_walk_cpu_trans(unsigned long *rto, dma_addr_t dma_addr)
>   	px = calc_px(dma_addr);
>   	return &pto[px];
>   }
> +EXPORT_SYMBOL_GPL(dma_walk_cpu_trans);
>   
>   void dma_update_cpu_trans(unsigned long *entry, void *page_addr, int flags)
>   {
> diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
> index d1a8bd43ce26..0d1ab268ec24 100644
> --- a/arch/s390/pci/pci_insn.c
> +++ b/arch/s390/pci/pci_insn.c
> @@ -95,6 +95,7 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
>   
>   	return (cc) ? -EIO : 0;
>   }
> +EXPORT_SYMBOL_GPL(zpci_refresh_trans);
>   
>   /* Set Interruption Controls */
>   int zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib)
>