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

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Message-ID: <20190624065829.GA23605@infradead.org>
Date:   Sun, 23 Jun 2019 23:58:29 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Oded Gabbay <oded.gabbay@...il.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 8/8] habanalabs: enable 64-bit DMA mask in POWER9

Because as a matter of policy the driver has no business knowing the
actual bridge.  Even if we'd agree that a driver workaround would be
the right thing it has to be discoverable by an actual interface and
not a system type or root port PCI ID.