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From: Thierry Reding <thierry.reding@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>,
	Jon Hunter <jonathanh@nvidia.com>,
	Sameer Pujar <spujar@nvidia.com>,
	linux-tegra@vger.kernel.org, alsa-devel@alsa-project.org,
	devicetree@vger.kernel.org
Subject: [PATCH v2 0/2] arm64: tegra: Enable audio IOMMU support on Tegra194
Date: Thu,  8 Jul 2021 12:34:30 +0200	[thread overview]
Message-ID: <20210708103432.1690385-1-thierry.reding@gmail.com> (raw)

From: Thierry Reding <treding@nvidia.com>

This small series addresses a minor issue with how IOMMU support is
wired up on various Tegra generations. Currently the virtual "card"
device is used to allocate DMA memory for, but since that device does
not actually exist, the path to memory cannot be correctly described.

To address this, this series moves to using the ADMAIF as the DMA device
for audio. This is a real device that can have a proper DMA mask set and
with which a stream ID can be associated with in the SMMU. The memory
accesses technically originate from the ADMA controller (that the ADMAIF
uses), but DMA channel are dynamically allocated at runtime while DMA
memory is allocated at driver load time, drivers won't have access to
the ADMA device yet.

Further patches will be required to correct this issue on Tegra186 and
Tegra210, but I wanted to get feedback on this approach first.

Changes in v2:
- add backwards-compatibility fallback

Thierry

Thierry Reding (2):
  ASoC: tegra: Use ADMAIF component for DMA allocations
  arm64: tegra: Enable audio IOMMU support on Tegra194

 arch/arm64/boot/dts/nvidia/tegra194.dtsi |  4 ++++
 sound/soc/tegra/tegra_pcm.c              | 30 ++++++++++++++----------
 2 files changed, 22 insertions(+), 12 deletions(-)

-- 
2.32.0


WARNING: multiple messages have this Message-ID (diff)
From: Thierry Reding <thierry.reding@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>
Cc: devicetree@vger.kernel.org, alsa-devel@alsa-project.org,
	Sameer Pujar <spujar@nvidia.com>,
	Jon Hunter <jonathanh@nvidia.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-tegra@vger.kernel.org
Subject: [PATCH v2 0/2] arm64: tegra: Enable audio IOMMU support on Tegra194
Date: Thu,  8 Jul 2021 12:34:30 +0200	[thread overview]
Message-ID: <20210708103432.1690385-1-thierry.reding@gmail.com> (raw)

From: Thierry Reding <treding@nvidia.com>

This small series addresses a minor issue with how IOMMU support is
wired up on various Tegra generations. Currently the virtual "card"
device is used to allocate DMA memory for, but since that device does
not actually exist, the path to memory cannot be correctly described.

To address this, this series moves to using the ADMAIF as the DMA device
for audio. This is a real device that can have a proper DMA mask set and
with which a stream ID can be associated with in the SMMU. The memory
accesses technically originate from the ADMA controller (that the ADMAIF
uses), but DMA channel are dynamically allocated at runtime while DMA
memory is allocated at driver load time, drivers won't have access to
the ADMA device yet.

Further patches will be required to correct this issue on Tegra186 and
Tegra210, but I wanted to get feedback on this approach first.

Changes in v2:
- add backwards-compatibility fallback

Thierry

Thierry Reding (2):
  ASoC: tegra: Use ADMAIF component for DMA allocations
  arm64: tegra: Enable audio IOMMU support on Tegra194

 arch/arm64/boot/dts/nvidia/tegra194.dtsi |  4 ++++
 sound/soc/tegra/tegra_pcm.c              | 30 ++++++++++++++----------
 2 files changed, 22 insertions(+), 12 deletions(-)

-- 
2.32.0


             reply	other threads:[~2021-07-08 10:32 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08 10:34 Thierry Reding [this message]
2021-07-08 10:34 ` [PATCH v2 0/2] arm64: tegra: Enable audio IOMMU support on Tegra194 Thierry Reding
2021-07-08 10:34 ` [PATCH v2 1/2] ASoC: tegra: Use ADMAIF component for DMA allocations Thierry Reding
2021-07-08 10:34   ` Thierry Reding
2021-07-08 10:34 ` [PATCH v2 2/2] arm64: tegra: Enable audio IOMMU support on Tegra194 Thierry Reding
2021-07-08 10:34   ` Thierry Reding
2021-07-12 10:45 ` (subset) [PATCH v2 0/2] " Mark Brown
2021-07-12 10:45   ` Mark Brown

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