linux-kernel - Re: [PATCH v2 0/5] Introduce "non-pixel" sub node within iris video node

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <a8be1465-3a99-7ca8-7098-34c97bc1f890@quicinc.com>
Date: Fri, 27 Jun 2025 21:19:52 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
        Abhinav Kumar
	<abhinav.kumar@...ux.dev>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/5] Introduce "non-pixel" sub node within iris video
 node


On 6/27/2025 9:02 PM, Vikash Garodia wrote:
> This series introduces a sub node "non-pixel" within iris video node.
> Video driver registers this sub node as a platform device and configure 
> it for DMA operations. All non pixel buffers, i.e bitstream, HFI queues 
> and internal buffers related to bitstream processing, would be managed 
> by this non_pixel device.
> 
> Purpose to add this sub-node:
> Iris device limits the IOVA to an addressable range of 4GiB, and even 
> within that range, some of the space is used by IO registers, thereby 
> limiting the available IOVA to even lesser. For certain video usecase, 
> this limited range in not sufficient enough, hence it brings the need to 
> extend the possibility of higher IOVA range.
> 
> Video hardware is designed to emit different stream-ID for pixel and 
> non-pixel buffers, thereby introduce a non-pixel sub node to handle 
> non-pixel stream-ID into a separate platform device.
> With this, both iris and non-pixel device can have IOVA range of 
> approximately 0-4GiB individually for each device, thereby doubling the 
> range of addressable IOVA.
> 
> Tested on SM8550 and SA8775p hardwares.

Please ignore V2 revision as i missed to address a comment on V1. Posted V3 now
with all comments addressed.

Apologies for the inconvenience.

Regards,
Vikash

> 
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
> Changes in v2:
> - Add ref to reserve-memory schema and drop it from redefining it in 
> iris schema (Thanks Krzysztof)
> - Drop underscores and add info about non pixel buffers (Thanks Dmitry)
> - Link to v1: https://lore.kernel.org/r/20250620-video_cb-v1-0-9bcac1c8800c@quicinc.com
> 
> ---
> Vikash Garodia (5):
>       media: dt-bindings: add non-pixel property in iris schema
>       media: iris: register and configure non-pixel node as platform device
>       media: iris: use np_dev as preferred DMA device in HFI queue management
>       media: iris: select appropriate DMA device for internal buffers
>       media: iris: configure DMA device for vb2 queue on OUTPUT plane
> 
>  .../bindings/media/qcom,sm8550-iris.yaml           | 40 ++++++++++++++++-
>  drivers/media/platform/qcom/iris/iris_buffer.c     | 15 ++++++-
>  drivers/media/platform/qcom/iris/iris_core.h       |  2 +
>  drivers/media/platform/qcom/iris/iris_hfi_queue.c  | 20 ++++++---
>  drivers/media/platform/qcom/iris/iris_probe.c      | 50 +++++++++++++++++++++-
>  drivers/media/platform/qcom/iris/iris_vb2.c        |  4 ++
>  6 files changed, 119 insertions(+), 12 deletions(-)
> ---
> base-commit: 8d2b7fde56597ca912f5daaf3ab58915458ba1fc
> change-id: 20250619-video_cb-ea872d6e6627
> 
> Best regards,