Re: [PATCH v2 13/30] s390/pci: return status from zpci_refresh_trans

Niklas Schnelle
2022-01-27T10:30:30Z

On Fri, 2022-01-14 at 15:31 -0500, Matthew Rosato wrote:
> Current callers of zpci_refresh_trans don't need to interrogate the status
> returned from the underlying instructions. However, a subsequent patch
> will add a KVM caller that needs this information. Add a new argument to
> zpci_refresh_trans to pass the address of a status byte and update
> existing call sites to provide it.
>
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
> arch/s390/include/asm/pci_insn.h | 2 +-
> arch/s390/pci/pci_dma.c | 6 ++++--
> arch/s390/pci/pci_insn.c | 10 +++++-----
> drivers/iommu/s390-iommu.c | 4 +++-
> 4 files changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/arch/s390/include/asm/pci_insn.h b/arch/s390/include/asm/pci_insn.h
> index 5331082fa516..32759c407b8f 100644
> --- a/arch/s390/include/asm/pci_insn.h
> +++ b/arch/s390/include/asm/pci_insn.h
> @@ -135,7 +135,7 @@ union zpci_sic_iib {
> DECLARE_STATIC_KEY_FALSE(have_mio);
>
> u8 zpci_mod_fc(u64 req, struct zpci_fib *fib, u8 *status);
> -int zpci_refresh_trans(u64 fn, u64 addr, u64 range);
> +int zpci_refresh_trans(u64 fn, u64 addr, u64 range, u8 *status);
>
---8<---
>
> return (cc) ? -EIO : 0;
> diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
> index 50860ebdd087..845bb99c183e 100644
> --- a/drivers/iommu/s390-iommu.c
> +++ b/drivers/iommu/s390-iommu.c
> @@ -214,6 +214,7 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain,
> unsigned long irq_flags, nr_pages, i;
> unsigned long *entry;
> int rc = 0;
> + u8 status;
>
> if (dma_addr < s390_domain->domain.geometry.aperture_start ||
> dma_addr + size > s390_domain->domain.geometry.aperture_end)
> @@ -238,7 +239,8 @@ static int s390_iommu_update_trans(struct s390_domain *s390_domain,
> spin_lock(&s390_domain->list_lock);
> list_for_each_entry(domain_device, &s390_domain->devices, list) {
> rc = zpci_refresh_trans((u64) domain_device->zdev->fh << 32,
> - start_dma_addr, nr_pages * PAGE_SIZE);
> + start_dma_addr, nr_pages * PAGE_SIZE,
> + &status);
> if (rc)
> break;
> }

Looks good.

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>