linux-kernel - [PATCH v2 0/2] mtd: devices: Qualcomm SCM storage support

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-Id: <20260126-scm-storage-v2-v2-0-fa045c7e7699@radxa.com>
Date: Mon, 26 Jan 2026 19:44:50 +0800
From: Junhao Xie <bigfoot@...xa.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-mtd@...ts.infradead.org, Xilin Wu <sophon@...xa.com>, 
 Junhao Xie <bigfoot@...xa.com>
Subject: [PATCH v2 0/2] mtd: devices: Qualcomm SCM storage support

This patch series adds support for accessing storage devices managed by
Qualcomm TrustZone firmware via SCM (Secure Channel Manager) by
introducing a new MTD driver.

On some Qualcomm platforms, firmware or BIOS-related storage (typically
SPI NOR flash) is not directly accessible from the non-secure world.
All read, write, and erase operations must be performed through SCM
interfaces provided by the secure firmware. As a result, existing MTD
SPI NOR drivers cannot be used directly on these systems.

This series introduces a new MTD device driver that exposes such
firmware-managed storage as a standard MTD device in the Linux kernel.
The driver is built on top of the existing Qualcomm SCM infrastructure
and integrates with the MTD subsystem to provide a uniform interface to
userspace.

This driver has been tested on Radxa Dragon Q6A, based on the Qualcomm
QCS6490 SoC, with a Winbond W25Q256JWPIQ SPI NOR flash device.

Note that this platform previously used the standard Qualcomm Linux
firmware, which allowed direct access to the QSPI controller without
needing this driver. However, we plan to migrate to a Windows-compatible
firmware which is more feature-complete but restricts direct access.
Device tree changes for this transition will be sent separately.

If kernel boots with EL2, access to the SCM storage will be denied. This
needs more investigation.

Changes in v2:
- Convert enum qcom_scm_storage_result to macro definitions
- Use __qcom_scm_is_call_available() instead of a machine allowlist
- Add missing __packed annotations and endianness handling
- Introduce struct qcom_scm_storage_payload to improve readability
- Always compiled-in qcom_scm_storage_send_cmd() and qcom_scm_storage_init()
https://lore.kernel.org/lkml/F138514E18CB55B6+20251218180205.930961-1-bigfoot@radxa.com/

Tested-by: Xilin Wu <sophon@...xa.com>
Signed-off-by: Junhao Xie <bigfoot@...xa.com>
---
Junhao Xie (2):
      firmware: qcom: scm: Add SCM storage interface support
      mtd: devices: Add Qualcomm SCM storage driver

 drivers/firmware/qcom/qcom_scm.c       | 161 ++++++++++++++++++++
 drivers/firmware/qcom/qcom_scm.h       |   3 +
 drivers/mtd/devices/Kconfig            |  17 +++
 drivers/mtd/devices/Makefile           |   1 +
 drivers/mtd/devices/qcom_scm_storage.c | 265 +++++++++++++++++++++++++++++++++
 include/linux/firmware/qcom/qcom_scm.h |  34 +++++
 6 files changed, 481 insertions(+)
---
base-commit: 63804fed149a6750ffd28610c5c1c98cce6bd377
change-id: 20260126-scm-storage-v2-0a4f3e900b88

Best regards,
-- 
Junhao Xie <bigfoot@...xa.com>