From: "Joerg Roedel (AMD)" <joro@8bytes.org>
To: Ekansh Gupta <ekansh.gupta@oss.qualcomm.com>
Cc: "Oded Gabbay" <ogabbay@kernel.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Nathan Chancellor" <nathan@kernel.org>,
"Nick Desaulniers" <ndesaulniers@google.com>,
"Bill Wendling" <morbo@google.com>,
"Justin Stitt" <justinstitt@google.com>,
"Will Deacon" <will@kernel.org>,
"Robin Murphy" <robin.murphy@arm.com>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>,
"Bharath Kumar" <quic_bkumar@quicinc.com>,
"Chenna Kesava Raju" <quic_chennak@quicinc.com>,
srinivas.kandagatla@oss.qualcomm.com,
dmitry.baryshkov@oss.qualcomm.com, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org,
linux-arm-msm@vger.kernel.org, llvm@lists.linux.dev,
iommu@lists.linux.dev, linux-media@vger.kernel.org,
linaro-mm-sig@lists.linaro.org
Subject: Re: [PATCH v2 05/15] iommu: Add QDA compute context bank bus to iommu_buses
Date: Mon, 17 Aug 2026 09:01:10 +0200 [thread overview]
Message-ID: <aoKxmtgbjmVBTwBS@8bytes.org> (raw)
In-Reply-To: <20260817-qda-v2-v2-5-69a02e9090d4@oss.qualcomm.com>
On Mon, Aug 17, 2026 at 10:17:40AM +0530, Ekansh Gupta wrote:
> Register the QDA compute context bank bus (qda-compute-cb) with the
> IOMMU subsystem by adding it to the iommu_buses[] array.
>
> The QDA driver creates synthetic devices on this bus to represent
> IOMMU context banks (CBs). Each CB device needs its own IOMMU domain
> so that the DSP memory manager can enforce per-session address space
> isolation. Without this registration, the IOMMU subsystem does not
> probe CB devices for IOMMU groups and of_dma_configure() in the bus
> dma_configure callback has no IOMMU domain to attach to.
>
> Assisted-by: Claude:claude-sonnet-5
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> Signed-off-by: Ekansh Gupta <ekansh.gupta@oss.qualcomm.com>
> ---
> drivers/iommu/iommu.c | 4 ++++
> 1 file changed, 4 insertions(+)
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
next prev parent reply other threads:[~2026-08-17 7:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 4:47 [PATCH v2 00/15] accel/qda: Qualcomm DSP Accelerator driver Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 01/15] MAINTAINERS: Add entry for Qualcomm DSP Accelerator (QDA) driver Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 02/15] accel/qda: Add QDA driver documentation Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 03/15] accel/qda: Add initial QDA DRM accelerator driver Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 04/15] accel/qda: Add compute bus for QDA context banks Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 05/15] iommu: Add QDA compute context bank bus to iommu_buses Ekansh Gupta
2026-08-17 7:01 ` Joerg Roedel (AMD) [this message]
2026-08-17 13:44 ` Jason Gunthorpe
2026-08-17 4:47 ` [PATCH v2 06/15] accel/qda: Create compute context bank devices on QDA compute bus Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 07/15] accel/qda: Add memory manager for CB devices Ekansh Gupta
2026-08-17 6:52 ` Dmitry Baryshkov
2026-08-17 4:47 ` [PATCH v2 08/15] accel/qda: Add QUERY IOCTL and QDA UAPI header Ekansh Gupta
2026-08-17 6:58 ` Dmitry Baryshkov
2026-08-17 4:47 ` [PATCH v2 09/15] accel/qda: Add DMA-backed GEM objects and memory manager integration Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 10/15] accel/qda: Add GEM_CREATE and GEM_MMAP_OFFSET IOCTLs Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 11/15] accel/qda: Add PRIME DMA-BUF import support Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 12/15] accel/qda: Add FastRPC invocation support Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 13/15] accel/qda: Add DSP process creation and release Ekansh Gupta
2026-08-17 4:47 ` [PATCH v2 14/15] accel/qda: Add remote memory mapping to DSP address space Ekansh Gupta
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aoKxmtgbjmVBTwBS@8bytes.org \
--to=joro@8bytes.org \
--cc=airlied@gmail.com \
--cc=christian.koenig@amd.com \
--cc=corbet@lwn.net \
--cc=dmitry.baryshkov@oss.qualcomm.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=ekansh.gupta@oss.qualcomm.com \
--cc=iommu@lists.linux.dev \
--cc=justinstitt@google.com \
--cc=linaro-mm-sig@lists.linaro.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=llvm@lists.linux.dev \
--cc=maarten.lankhorst@linux.intel.com \
--cc=morbo@google.com \
--cc=mripard@kernel.org \
--cc=nathan@kernel.org \
--cc=ndesaulniers@google.com \
--cc=ogabbay@kernel.org \
--cc=quic_bkumar@quicinc.com \
--cc=quic_chennak@quicinc.com \
--cc=rdunlap@infradead.org \
--cc=robin.murphy@arm.com \
--cc=simona@ffwll.ch \
--cc=skhan@linuxfoundation.org \
--cc=srinivas.kandagatla@oss.qualcomm.com \
--cc=sumit.semwal@linaro.org \
--cc=tzimmermann@suse.de \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox