From: Leon Romanovsky <leon@kernel.org>
To: Gal Pressman <galpress@amazon.com>
Cc: RDMA mailing list <linux-rdma@vger.kernel.org>
Subject: Re: ib_umem_get and DMA_API_DEBUG question
Date: Mon, 26 Aug 2019 17:23:20 +0300 [thread overview]
Message-ID: <20190826142320.GD4584@mtr-leonro.mtl.com> (raw)
In-Reply-To: <526c5b18-5853-c8dc-e112-31287a46e707@amazon.com>
On Mon, Aug 26, 2019 at 05:05:12PM +0300, Gal Pressman wrote:
> Hi all,
>
> Lately I've been seeing DMA-API call traces on our automated testing runs which
> complain about overlapping mappings of the same cacheline [1].
> The problem is (most likely) caused due to multiple calls to ibv_reg_mr with the
> same address, which as a result DMA maps the same physical addresses more than 7
> (ACTIVE_CACHELINE_MAX_OVERLAP) times.
>
> Is this considered a bad behavior by the test? Should this be caught by
> ib_core/driver somehow?
If I'm not mistaken here, but we (Mellanox) decided that it is a bug in
DMA debug code.
Thanks
next prev parent reply other threads:[~2019-08-26 14:23 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-26 14:05 ib_umem_get and DMA_API_DEBUG question Gal Pressman
2019-08-26 14:23 ` Leon Romanovsky [this message]
2019-08-26 14:39 ` Gal Pressman
2019-08-26 14:39 ` Jason Gunthorpe
2019-08-27 8:28 ` Gal Pressman
2019-08-27 12:00 ` Jason Gunthorpe
2019-08-27 12:53 ` Gal Pressman
2019-08-27 13:17 ` Jason Gunthorpe
2019-08-27 13:22 ` Gal Pressman
2019-08-27 13:37 ` Jason Gunthorpe
2019-08-27 13:53 ` Gal Pressman
2019-08-28 14:15 ` Jason Gunthorpe
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