From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, Thomas Monjalon <thomas@monjalon.net>,
Ben Walker <benjamin.walker@intel.com>
Subject: Re: [dpdk-dev] [EXT] Re: [PATCH] bus/pci: fix IOVA as VA mode selection
Date: Tue, 9 Jul 2019 10:44:35 +0100 [thread overview]
Message-ID: <ef1779e4-f553-153c-062e-ce47f0293a2d@intel.com> (raw)
In-Reply-To: <BYAPR18MB2424D794776AD36FF9FAABADC8F60@BYAPR18MB2424.namprd18.prod.outlook.com>
On 08-Jul-19 8:13 PM, Jerin Jacob Kollanukkaran wrote:
> See below,
>
> Please send the email as text to avoid formatting issue.(No HTML)
>
> From: David Marchand <david.marchand@redhat.com>
> Sent: Tuesday, July 9, 2019 12:09 AM
> To: Jerin Jacob Kollanukkaran <jerinj@marvell.com>
> Cc: dev <dev@dpdk.org>; Thomas Monjalon <thomas@monjalon.net>; Ben Walker <benjamin.walker@intel.com>; Burakov, Anatoly <anatoly.burakov@intel.com>
> Subject: [EXT] Re: [dpdk-dev] [PATCH] bus/pci: fix IOVA as VA mode selection
>
> ________________________________________
>
> On Mon, Jul 8, 2019 at 4:25 PM <mailto:jerinj@marvell.com> wrote:
> From: Jerin Jacob <mailto:jerinj@marvell.com>
>
> Existing logic fails to select IOVA mode as VA
> if driver request to enable IOVA as VA.
>
> IOVA as VA has more strict requirement than other modes,
> so enabling positive logic for IOVA as VA selection.
>
> This patch also updates the default IOVA mode as PA
> for PCI devices as it has to deal with DMA engines unlike
> the virtual devices that may need only IOVA as DC.
>
> We have three cases:
> - driver/hw supports IOVA as PA only
>
> [Jerin] It is not driver cap, it is more of system cap(IOMMU vs non IOMMU). We are already addressing that case
I don't get how this works. How does "system capability" affect what the
device itself supports? Are we to assume that *all* hardware support
IOVA as VA by default? "System capability" is more of a bus issue than
an individual device issue, is it not?
--
Thanks,
Anatoly
next prev parent reply other threads:[~2019-07-09 9:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-08 14:24 [dpdk-dev] " jerinj
2019-07-08 18:39 ` David Marchand
2019-07-08 19:13 ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2019-07-09 8:39 ` Bruce Richardson
2019-07-09 9:05 ` Jerin Jacob Kollanukkaran
2019-07-09 9:32 ` Bruce Richardson
2019-07-09 9:44 ` Burakov, Anatoly [this message]
2019-07-09 11:13 ` Jerin Jacob Kollanukkaran
2019-07-09 11:40 ` Burakov, Anatoly
2019-07-09 12:11 ` Jerin Jacob Kollanukkaran
2019-07-09 13:30 ` Burakov, Anatoly
2019-07-09 13:50 ` Burakov, Anatoly
2019-07-09 14:19 ` Jerin Jacob Kollanukkaran
2019-07-09 14:00 ` Jerin Jacob Kollanukkaran
2019-07-09 14:37 ` Burakov, Anatoly
2019-07-09 15:04 ` Thomas Monjalon
2019-07-09 15:06 ` Burakov, Anatoly
2019-07-09 17:50 ` Jerin Jacob Kollanukkaran
2019-07-10 8:09 ` David Marchand
2019-07-09 14:54 ` Burakov, Anatoly
2019-07-09 14:58 ` Jerin Jacob Kollanukkaran
2019-07-09 15:02 ` Burakov, Anatoly
2019-07-09 15:12 ` Thomas Monjalon
2019-07-09 15:18 ` Burakov, Anatoly
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