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From: Joerg Roedel <jroedel@suse.de>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: Joerg Roedel <joro@8bytes.org>,
	iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>,
	Russell King <linux+etnaviv@armlinux.org.uk>,
	Christian Gmeiner <christian.gmeiner@gmail.com>,
	David Airlie <airlied@linux.ie>,
	etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 06/13] drm/etnaviv: Use sychronized interface of the IOMMU-API
Date: Thu, 17 Aug 2017 15:45:39 +0200	[thread overview]
Message-ID: <20170817134539.GJ2853@suse.de> (raw)
In-Reply-To: <1502976758.19806.25.camel@pengutronix.de>

Hi Lucas,

On Thu, Aug 17, 2017 at 03:32:38PM +0200, Lucas Stach wrote:
> I don't think this is necessary. Etnaviv has managed and batched up TLB
> flushes from day 1, as they don't happen through the MMU MMIO interface,
> but through the GPU command stream.
> 
> So if my understanding of this series is correct, Etnaviv is just fine
> with the changed semantics of the unsynchronized map/unmap calls.

This is not about any TLB on the GPU that could be flushed through the
GPU command stream, but about the TLB in the IOMMU device. Or is this
actually the same on this hardware? Which IOMMU-driver is use there?


Regards,

	Joerg

  reply	other threads:[~2017-08-17 13:45 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-17 12:56 [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface Joerg Roedel
2017-08-17 12:56 ` [PATCH 01/13] iommu/amd: Rename a few flush functions Joerg Roedel
2017-08-17 12:56 ` [PATCH 02/13] iommu: Introduce Interface for IOMMU TLB Flushing Joerg Roedel
2017-08-17 16:32   ` Will Deacon
2017-08-17 16:50     ` Joerg Roedel
2017-08-17 17:17       ` Will Deacon
2017-08-17 21:20         ` Joerg Roedel
2017-08-18 15:16           ` Will Deacon
2017-08-17 12:56 ` [PATCH 03/13] vfio/type1: Use sychronized interface of the IOMMU-API Joerg Roedel
2017-08-17 12:56 ` [PATCH 04/13] iommu/dma: " Joerg Roedel
2017-08-17 12:56 ` [PATCH 05/13] arm: dma-mapping: " Joerg Roedel
2017-08-17 12:56 ` [PATCH 06/13] drm/etnaviv: " Joerg Roedel
2017-08-17 13:32   ` Lucas Stach
2017-08-17 13:45     ` Joerg Roedel [this message]
2017-08-17 14:03       ` Lucas Stach
2017-08-17 14:18         ` Joerg Roedel
2017-08-17 14:30           ` Lucas Stach
2017-08-17 14:35             ` Joerg Roedel
2017-08-17 12:56 ` [PATCH 07/13] drm/msm: " Joerg Roedel
2017-08-19 15:39   ` Rob Clark
2017-08-17 12:56 ` [PATCH 08/13] drm/nouveau/imem/gk20a: " Joerg Roedel
2017-08-17 12:56 ` [PATCH 09/13] drm/rockchip: " Joerg Roedel
2017-08-17 12:56 ` [PATCH 10/13] drm/tegra: " Joerg Roedel
2017-08-17 13:28   ` Thierry Reding
2017-08-17 12:56 ` [PATCH 11/13] gpu: host1x: " Joerg Roedel
2017-08-17 13:29   ` Thierry Reding
2017-08-17 12:56 ` [PATCH 12/13] IB/usnic: " Joerg Roedel
2017-08-17 12:56 ` [PATCH 13/13] remoteproc: " Joerg Roedel
2017-08-24 19:06   ` Bjorn Andersson
2017-08-17 14:35 ` [PATCH 00/13] Introduce IOMMU-API TLB Flushing Interface Alex Williamson
2017-08-17 14:43   ` Joerg Roedel
2017-08-17 14:54     ` Alex Williamson
2017-08-17 15:22       ` Joerg Roedel
2017-08-23 12:09         ` Joerg Roedel

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