From: Jason Gunthorpe <jgg@nvidia.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Leon Romanovsky <leonro@nvidia.com>,
Bernard Metzler <BMT@zurich.ibm.com>,
linux-rdma@vger.kernel.org
Subject: Re: [PATCH] RDMA/rxe: Pass a pointer to virt_to_page()
Date: Wed, 29 Mar 2023 20:16:19 -0300 [thread overview]
Message-ID: <ZCTGw3+9rYQAmlJS@nvidia.com> (raw)
In-Reply-To: <CACRpkdYTynQS3XwW8j_vamb7wcRwu0Ji1ZZ-HDDs0wQQy4SRzA@mail.gmail.com>
On Wed, Mar 29, 2023 at 04:28:08PM +0200, Linus Walleij wrote:
> I'm a bit puzzled: could the above code (which exist in
> three instances in the driver) even work as it is? Or is it not used?
> Or is there some failover from DMA to something else that is constantly
> happening?
The physical address dma type IB_MR_TYPE_DMA is rarely used and maybe
nobody ever tested it, at least in a configuration where kva != pa
Then again, maybe I got it wrong and it is still a kva in this case
because it is still ultimately DMA mapped when using IB_MR_TYPE_DMA?
Bob?
Jason
next prev parent reply other threads:[~2023-03-29 23:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-24 10:32 [PATCH] RDMA/rxe: Pass a pointer to virt_to_page() Linus Walleij
2023-03-24 12:27 ` kernel test robot
2023-03-24 13:59 ` Jason Gunthorpe
2023-03-29 14:28 ` Linus Walleij
2023-03-29 20:17 ` Bob Pearson
2023-03-29 23:16 ` Jason Gunthorpe [this message]
2023-03-30 2:45 ` Bob Pearson
2023-03-30 12:06 ` Jason Gunthorpe
2023-03-30 15:19 ` Linus Walleij
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