hw/s390x/s390-pci-inst.c: Use device_cold_reset() to reset PCI devices

[PATCH] hw/s390x/s390-pci-inst.c: Use device_cold_reset() to reset PCI devices

Peter Maydell posted 1 patch 1 year, 7 months ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20221013172123.1448288-1-peter.maydell@linaro.org

Maintainers: Matthew Rosato <mjrosato@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Richard Henderson <richard.henderson@linaro.org>, David Hildenbrand <david@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Thomas Huth <thuth@redhat.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>

hw/s390x/s390-pci-inst.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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[PATCH] hw/s390x/s390-pci-inst.c: Use device_cold_reset() to reset PCI devices

Posted by Peter Maydell 1 year, 7 months ago

The semantic difference between the deprecated device_legacy_reset()
function and the newer device_cold_reset() function is that the new
function resets both the device itself and any qbuses it owns,
whereas the legacy function resets just the device itself and nothing
else.

In s390-pci-inst.c we use device_legacy_reset() to reset an
S390PCIBusDevice.  This device doesn't have any child qbuses, so the
functions do the same thing and we can stop using the deprecated one.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
NB: tested only with 'make check' and 'make check-avocado', which
probably don't exercise this codepath.

 hw/s390x/s390-pci-inst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
index 20a9bcc7afb..16f5a3e81b4 100644
--- a/hw/s390x/s390-pci-inst.c
+++ b/hw/s390x/s390-pci-inst.c
@@ -272,7 +272,7 @@ int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
                 stw_p(&ressetpci->hdr.rsp, CLP_RC_SETPCIFN_FHOP);
                 goto out;
             }
-            device_legacy_reset(DEVICE(pbdev));
+            device_cold_reset(DEVICE(pbdev));
             pbdev->fh &= ~FH_MASK_ENABLE;
             pbdev->state = ZPCI_FS_DISABLED;
             stl_p(&ressetpci->fh, pbdev->fh);
-- 
2.25.1

Re: [PATCH] hw/s390x/s390-pci-inst.c: Use device_cold_reset() to reset PCI devices

Posted by Matthew Rosato 1 year, 7 months ago

On 10/13/22 1:21 PM, Peter Maydell wrote:
> The semantic difference between the deprecated device_legacy_reset()
> function and the newer device_cold_reset() function is that the new
> function resets both the device itself and any qbuses it owns,
> whereas the legacy function resets just the device itself and nothing
> else.
> 
> In s390-pci-inst.c we use device_legacy_reset() to reset an
> S390PCIBusDevice.  This device doesn't have any child qbuses, so the
> functions do the same thing and we can stop using the deprecated one.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> NB: tested only with 'make check' and 'make check-avocado', which
> probably don't exercise this codepath.
>

I exercised the codepath by triggering the associated clp using both virtio and vfio pci devices on s390x; looks good to me.

Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>

 
>  hw/s390x/s390-pci-inst.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
> index 20a9bcc7afb..16f5a3e81b4 100644
> --- a/hw/s390x/s390-pci-inst.c
> +++ b/hw/s390x/s390-pci-inst.c
> @@ -272,7 +272,7 @@ int clp_service_call(S390CPU *cpu, uint8_t r2, uintptr_t ra)
>                  stw_p(&ressetpci->hdr.rsp, CLP_RC_SETPCIFN_FHOP);
>                  goto out;
>              }
> -            device_legacy_reset(DEVICE(pbdev));
> +            device_cold_reset(DEVICE(pbdev));
>              pbdev->fh &= ~FH_MASK_ENABLE;
>              pbdev->state = ZPCI_FS_DISABLED;
>              stl_p(&ressetpci->fh, pbdev->fh);