linux-kernel - [PATCH v6 00/13] arm64: qcom: add and enable SHM Bridge support

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Message-Id: <20231127141600.20929-1-brgl@bgdev.pl>
Date:   Mon, 27 Nov 2023 15:15:47 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Elliot Berman <quic_eberman@...cinc.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Guru Das Srinagesh <quic_gurus@...cinc.com>,
        Andrew Halaney <ahalaney@...hat.com>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Alex Elder <elder@...aro.org>,
        Srini Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...cinc.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v6 00/13] arm64: qcom: add and enable SHM Bridge support

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

This is pretty much another full rewrite of the SHM Bridge support
series. After more on- and off-list discussions I think this time it
will be close to the final thing though.

We've established the need for using separate pools for SCM and QSEECOM
as well as the upcoming scminvoke driver.

It's also become clear that in order to be future-proof, the new
allocator must be an abstraction layer of a higher level as the SHM
Bridge will not be the only memory protection mechanism that we'll see
upstream. Hence the rename to TrustZone Memory rather than SCM Memory
allocator.

Also to that end: the new allocator is its own module now and provides a
Kconfig choice menu for selecting the mode of operation (currently
default and SHM Bridge).

Due to a high divergence from v2, I dropped all tags except for
patch 1/15 which didn't change.

Tested on sm8550 and sa8775p with the Inline Crypto Engine and
remoteproc.

v5 -> v6:
Fixed two issues reported by autobuilders:
- add a fix for memory leaks in the qseecom driver as the first patch for
  easier backporting to the v6.6.y branch
- explicitly cast the bus address stored in a variable of type dma_addr_t
  to phys_addr_t expected by the genpool API

v4 -> v5:
- fix the return value from qcom_tzmem_init() if SHM Bridge is not supported
- remove a comment that's no longer useful
- collect tags

v3 -> v4:
- include linux/sizes.h for SZ_X macros
- use dedicated RCU APIs to dereference radix tree slots
- fix kerneldocs
- fix the comment in patch 14/15: it's the hypervisor, not the TrustZone
  that creates the SHM bridge

v2 -> v3:
- restore pool management and use separate pools for different users
- don't use the new allocator in qcom_scm_pas_init_image() as the
  TrustZone will create an SHM bridge for us here
- rewrite the entire series again for most part

v1 -> v2:
- too many changes to list, it's a complete rewrite as explained above

Bartosz Golaszewski (13):
  firmware: qcom: qseecom: fix memory leaks in error paths
  firmware: qcom: add a dedicated TrustZone buffer allocator
  firmware: qcom: scm: enable the TZ mem allocator
  firmware: qcom: scm: smc: switch to using the SCM allocator
  firmware: qcom: scm: make qcom_scm_assign_mem() use the TZ allocator
  firmware: qcom: scm: make qcom_scm_ice_set_key() use the TZ allocator
  firmware: qcom: scm: make qcom_scm_lmh_dcvsh() use the TZ allocator
  firmware: qcom: scm: make qcom_scm_qseecom_app_get_id() use the TZ
    allocator
  firmware: qcom: qseecom: convert to using the TZ allocator
  firmware: qcom: scm: add support for SHM bridge operations
  firmware: qcom: tzmem: enable SHM Bridge support
  firmware: qcom: scm: clarify the comment in qcom_scm_pas_init_image()
  arm64: defconfig: enable SHM Bridge support for the TZ memory
    allocator

 arch/arm64/configs/defconfig                  |   1 +
 drivers/firmware/qcom/Kconfig                 |  30 ++
 drivers/firmware/qcom/Makefile                |   1 +
 .../firmware/qcom/qcom_qseecom_uefisecapp.c   | 261 +++++--------
 drivers/firmware/qcom/qcom_scm-smc.c          |  30 +-
 drivers/firmware/qcom/qcom_scm.c              | 179 +++++----
 drivers/firmware/qcom/qcom_scm.h              |   6 +
 drivers/firmware/qcom/qcom_tzmem.c            | 365 ++++++++++++++++++
 drivers/firmware/qcom/qcom_tzmem.h            |  13 +
 include/linux/firmware/qcom/qcom_qseecom.h    |   4 +-
 include/linux/firmware/qcom/qcom_scm.h        |   6 +
 include/linux/firmware/qcom/qcom_tzmem.h      |  28 ++
 12 files changed, 669 insertions(+), 255 deletions(-)
 create mode 100644 drivers/firmware/qcom/qcom_tzmem.c
 create mode 100644 drivers/firmware/qcom/qcom_tzmem.h
 create mode 100644 include/linux/firmware/qcom/qcom_tzmem.h

-- 
2.40.1