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From: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: Re: [PATCH 2/3] drm/tegra: Reuse IOVA mapping where possible
Date: Wed, 5 Feb 2020 20:23:36 +0300	[thread overview]
Message-ID: <34fad3cf-b187-e80e-8654-d2a85b061734@gmail.com> (raw)
In-Reply-To: <20200204135926.1156340-3-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

04.02.2020 16:59, Thierry Reding пишет:
> From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> 
> This partially reverts the DMA API support that was recently merged
> because it was causing performance regressions on older Tegra devices.
> Unfortunately, the cache maintenance performed by dma_map_sg() and
> dma_unmap_sg() causes performance to drop by a factor of 10.
> 
> The right solution for this would be to cache mappings for buffers per
> consumer device, but that's a bit involved. Instead, we simply revert to
> the old behaviour of sharing IOVA mappings when we know that devices can
> do so (i.e. they share the same IOMMU domain).

Needs a stable tag:

Cc: <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> # v5.5

> Reported-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> ---
>  drivers/gpu/drm/tegra/gem.c   | 10 +++++++-
>  drivers/gpu/drm/tegra/plane.c | 44 ++++++++++++++++++++---------------
>  drivers/gpu/host1x/job.c      | 32 ++++++++++++++++++++++---
>  3 files changed, 63 insertions(+), 23 deletions(-)

Otherwise LGTM,

Reviewed-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 2/3] drm/tegra: Reuse IOVA mapping where possible
Date: Wed, 5 Feb 2020 20:23:36 +0300	[thread overview]
Message-ID: <34fad3cf-b187-e80e-8654-d2a85b061734@gmail.com> (raw)
In-Reply-To: <20200204135926.1156340-3-thierry.reding@gmail.com>

04.02.2020 16:59, Thierry Reding пишет:
> From: Thierry Reding <treding@nvidia.com>
> 
> This partially reverts the DMA API support that was recently merged
> because it was causing performance regressions on older Tegra devices.
> Unfortunately, the cache maintenance performed by dma_map_sg() and
> dma_unmap_sg() causes performance to drop by a factor of 10.
> 
> The right solution for this would be to cache mappings for buffers per
> consumer device, but that's a bit involved. Instead, we simply revert to
> the old behaviour of sharing IOVA mappings when we know that devices can
> do so (i.e. they share the same IOMMU domain).

Needs a stable tag:

Cc: <stable@vger.kernel.org> # v5.5

> Reported-by: Dmitry Osipenko <digetx@gmail.com>
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> ---
>  drivers/gpu/drm/tegra/gem.c   | 10 +++++++-
>  drivers/gpu/drm/tegra/plane.c | 44 ++++++++++++++++++++---------------
>  drivers/gpu/host1x/job.c      | 32 ++++++++++++++++++++++---
>  3 files changed, 63 insertions(+), 23 deletions(-)

Otherwise LGTM,

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
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  parent reply	other threads:[~2020-02-05 17:23 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-04 13:59 [PATCH 0/3] drm/tegra: A couple of fixes for v5.6-rc1 Thierry Reding
2020-02-04 13:59 ` Thierry Reding
     [not found] ` <20200204135926.1156340-1-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-02-04 13:59   ` [PATCH 1/3] drm/tegra: Relax IOMMU usage criteria on old Tegra Thierry Reding
2020-02-04 13:59     ` Thierry Reding
     [not found]     ` <20200204135926.1156340-2-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-02-05 17:11       ` Dmitry Osipenko
2020-02-05 17:11         ` Dmitry Osipenko
2020-02-05 17:19       ` Dmitry Osipenko
2020-02-05 17:19         ` Dmitry Osipenko
2020-02-04 13:59   ` [PATCH 2/3] drm/tegra: Reuse IOVA mapping where possible Thierry Reding
2020-02-04 13:59     ` Thierry Reding
     [not found]     ` <20200204135926.1156340-3-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-02-05 17:11       ` Dmitry Osipenko
2020-02-05 17:11         ` Dmitry Osipenko
2020-02-05 17:23       ` Dmitry Osipenko [this message]
2020-02-05 17:23         ` Dmitry Osipenko
2020-02-05 17:29       ` Dmitry Osipenko
2020-02-05 17:29         ` Dmitry Osipenko
2020-02-04 13:59   ` [PATCH 3/3] gpu: host1x: Set DMA direction only for DMA-mapped buffer objects Thierry Reding
2020-02-04 13:59     ` Thierry Reding
     [not found]     ` <20200204135926.1156340-4-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-02-05 17:11       ` Dmitry Osipenko
2020-02-05 17:11         ` Dmitry Osipenko
2020-02-05 17:31       ` Dmitry Osipenko
2020-02-05 17:31         ` Dmitry Osipenko
2020-02-05 17:11   ` [PATCH 0/3] drm/tegra: A couple of fixes for v5.6-rc1 Dmitry Osipenko
2020-02-05 17:11     ` Dmitry Osipenko

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