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Subject: Re: [PATCH 1/1] vfio-pci/nvlink2: Allow fallback to ibm,mmio-atsd[0]
To: Sam Bobroff <sbobroff@linux.ibm.com>, kvm@vger.kernel.org,
 linuxppc-dev@lists.ozlabs.org, Alex Williamson <alex.williamson@redhat.com>
References: <426f75e09ac1a6879a6d51f592bf683c698b4bda.1580959044.git.sbobroff@linux.ibm.com>
From: Alexey Kardashevskiy <aik@ozlabs.ru>
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On 06/02/2020 14:17, Sam Bobroff wrote:
> Older versions of skiboot only provide a single value in the device	
> tree property "ibm,mmio-atsd", even when multiple Address Translation
> Shoot Down (ATSD) registers are present. This prevents NVLink2 devices
> (other than the first) from being used with vfio-pci because vfio-pci
> expects to be able to assign a dedicated ATSD register to each NVLink2
> device.
> 
> However, ATSD registers can be shared among devices. This change
> allows vfio-pci to fall back to sharing the register at index 0 if
> necessary.
> 
> Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
> ---
>  drivers/vfio/pci/vfio_pci_nvlink2.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci_nvlink2.c b/drivers/vfio/pci/vfio_pci_nvlink2.c
> index f2983f0f84be..851ba673882b 100644
> --- a/drivers/vfio/pci/vfio_pci_nvlink2.c
> +++ b/drivers/vfio/pci/vfio_pci_nvlink2.c
> @@ -420,8 +420,17 @@ int vfio_pci_ibm_npu2_init(struct vfio_pci_device *vdev)
>  
>  	if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", nvlink_index,
>  			&mmio_atsd)) {
> -		dev_warn(&vdev->pdev->dev, "No available ATSD found\n");
> -		mmio_atsd = 0;
> +		dev_warn(&vdev->pdev->dev,
> +			 "No ibm,mmio-atsd[%d] found: trying ibm,mmio-atsd[0]\n",
> +			 nvlink_index);


We do not really need this warning (nvlink_index doesn't matter that
much, we can work out from the device tree what happened), warnings
below are enough (if you really want, you can print nvlink_index there).

Either way,

Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>




> +		if (of_property_read_u64_index(hose->dn, "ibm,mmio-atsd", 0,
> +				&mmio_atsd)) {
> +			dev_warn(&vdev->pdev->dev, "No available ATSD found\n");
> +			mmio_atsd = 0;
> +		} else {
> +			dev_warn(&vdev->pdev->dev,
> +				 "Using fallback ibm,mmio-atsd[0] for ATSD.\n");
> +		}
>  	}
>  
>  	if (of_property_read_u64(npu_node, "ibm,device-tgt-addr", &tgt)) {
> 

-- 
Alexey