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

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Message-ID: <CAFCwf11y_K9oKHWkwBGQs1T_S8x+6=tyecpQ-Y7JKs8tQ6oBgA@mail.gmail.com>
Date:   Mon, 17 Jun 2019 11:35:32 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     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

On Mon, Jun 17, 2019 at 11:19 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Sun, Jun 16, 2019 at 02:24:08PM +0300, Oded Gabbay wrote:
> > So the alternative is that my device won't work on POWER9.
>
> The alternative is that we fix the powerpc code to do the right
> thing, which already is in progress.
Great, I agree this is the correct approach, and that's why I wrote in
my earlier email:

"I'll of course monitor the PPC code upstream and if they will manage
to push a fix to their current DMA mask limitation (that will allow
setting dma mask of 48 bits and without setting bit 59 in outbound
transactions), I will modify my code accordingly and then this hack
won't be necessary. But for now, it is what it is."

So I don't get it why you object for this temporary fix in my driver.

Thanks,
Oded