Re: [PATCH kernel 1/5] powerpc/powernv/npu: Add helper to access struct npu for NPU device

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Oct 15, 2018 at 08:32:57PM +1100, Alexey Kardashevskiy wrote:
> This step is to help removing the npu struct from pnv_phb so it
> can be used by pseries as well.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  arch/powerpc/platforms/powernv/npu-dma.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
> index 3a5c4ed..13e5153 100644
> --- a/arch/powerpc/platforms/powernv/npu-dma.c
> +++ b/arch/powerpc/platforms/powernv/npu-dma.c
> @@ -389,6 +389,18 @@ struct pnv_ioda_pe *pnv_pci_npu_setup_iommu(struct pnv_ioda_pe *npe)
>  	return gpe;
>  }
>  
> +/*
> + * NPU2 ATS
> + */
> +static struct npu *npdev_to_npu(struct pci_dev *npdev)
> +{
> +	struct pnv_phb *nphb;
> +
> +	nphb = pci_bus_to_host(npdev->bus)->private_data;
> +
> +	return &nphb->npu;
> +}
> +
>  /* Maximum number of nvlinks per npu */
>  #define NV_MAX_LINKS 6
>  
> @@ -546,7 +558,6 @@ static void acquire_atsd_reg(struct npu_context *npu_context,
>  	int i, j;
>  	struct npu *npu;
>  	struct pci_dev *npdev;
> -	struct pnv_phb *nphb;
>  
>  	for (i = 0; i <= max_npu2_index; i++) {
>  		mmio_atsd_reg[i].reg = -1;
> @@ -561,8 +572,7 @@ static void acquire_atsd_reg(struct npu_context *npu_context,
>  			if (!npdev)
>  				continue;
>  
> -			nphb = pci_bus_to_host(npdev->bus)->private_data;
> -			npu = &nphb->npu;
> +			npu = npdev_to_npu(npdev);
>  			mmio_atsd_reg[i].npu = npu;
>  			mmio_atsd_reg[i].reg = get_mmio_atsd_reg(npu);
>  			while (mmio_atsd_reg[i].reg < 0) {
> @@ -749,7 +759,7 @@ struct npu_context *pnv_npu2_init_context(struct pci_dev *gpdev,
>  	}
>  
>  	nphb = pci_bus_to_host(npdev->bus)->private_data;
> -	npu = &nphb->npu;
> +	npu = npdev_to_npu(npdev);
>  
>  	/*
>  	 * Setup the NPU context table for a particular GPU. These need to be
> @@ -869,7 +879,7 @@ void pnv_npu2_destroy_context(struct npu_context *npu_context,
>  		return;
>  
>  	nphb = pci_bus_to_host(npdev->bus)->private_data;
> -	npu = &nphb->npu;
> +	npu = npdev_to_npu(npdev);
>  	nvlink_dn = of_parse_phandle(npdev->dev.of_node, "ibm,nvlink", 0);
>  	if (WARN_ON(of_property_read_u32(nvlink_dn, "ibm,npu-link-index",
>  							&nvlink_index)))

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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