linux-kernel - Re: [PATCH v2 8/8] habanalabs: enable 64-bit DMA mask in POWER9

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Date:   Tue, 11 Jun 2019 11:58:57 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/8] habanalabs: enable 64-bit DMA mask in POWER9

On Tue, Jun 11, 2019 at 12:21:44PM +0300, Oded Gabbay wrote:
> +bool hl_pci_parent_is_phb4(struct hl_device *hdev)
> +{
> +	struct pci_dev *parent_port = hdev->pdev->bus->self;
> +
> +	if ((parent_port->vendor == PCI_VENDOR_ID_IBM) &&
> +			(parent_port->device == PCI_DEVICE_ID_IBM_PHB4)) {
> +		hdev->power9_64bit_dma_enable = 1;
> +		return true;
> +	}
> +
> +	hdev->power9_64bit_dma_enable = 0;
> +	return false;
> +}

That feels like a big hack.  ppc doesn't have any "what arch am I
running on?" runtime call?  Did you ask on the ppc64 mailing list?  I'm
ok to take this for now, but odds are you need a better fix for this
sometime...

thanks,

greg k-h