Re: [PATCH v5 00/17] Restructure, improve target support for qcom_scm driver

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Tue 07 Jan 13:04 PST 2020, Elliot Berman wrote:

> This series improves support for 32-bit Qualcomm targets on qcom_scm driver and cleans
> up the driver for 64-bit implementations.
> 
> Currently, the qcom_scm driver supports only 64-bit Qualcomm targets and very
> old 32-bit Qualcomm targets. Newer 32-bit targets use ARM's SMC Calling
> Convention to communicate with secure world. Older 32-bit targets use a
> "buffer-based" legacy approach for communicating with secure world (as
> implemented in qcom_scm-32.c). All arm64 Qualcomm targets use ARM SMCCC.
> Currently, SMCCC-based communication is enabled only on ARM64 config and
> buffer-based communication only on ARM config. This patch-series combines SMCCC
> and legacy conventions and selects the correct convention by querying the secure
> world [1].
> 
> We decided to take the opportunity as well to clean up the driver rather than
> try to patch together qcom_scm-32 and qcom_scm-64.
> 

Series applied.

Thank you,
Bjorn

> Patches 1-3 and 15 improve macro names, reorder macros/functions, and prune unused
>             macros/functions. No functional changes were introduced.
> Patches 4-8 clears up the SCM abstraction in qcom_scm-64.
> Patches 9-14 clears up the SCM abstraction in qcom_scm-32.
> Patches 16-17 enable dynamically using the different calling conventions.
> 
> [1]: https://source.codeaurora.org/quic/la/kernel/msm-4.9/tree/drivers/soc/qcom/scm.c?h=kernel.lnx.4.9.r28-rel#n555
> 
> Changes since v4:
>  - Restored missing arginfo/args to pas_auth_and_reset
> 
> Changes since v3:
>  - Updated recepients
> 
> Changes since v2:
>  - Addressed Stephen's comments throughout v2.
>  - Rebased onto latest for-next branch
>  - Removed v2 08/18 (firmware: qcom_scm-64: Remove qcom_scm_call_do_smccc)
>  - Cleaned up the convention query from v2 to align with [1].
> 
> Changes since v1:
>  - Renamed functions/variables per Vinod's suggestions
>  - Split v1 01/17 into v2 [01,02,03]/18 per Vinod's suggestion
>  - Fix suggestions by Bjorn in v1 09/18 (now v2 10/18)
>  - Refactor last 3 commits per Bjorn suggestions in v1 17/18 and v1 10/18
> 
> Changes since RFC:
>  - Fixed missing return values in qcom_scm_call_smccc
>  - Fixed order of arguments in qcom_scm_set_warm_boot_addr
>  - Adjusted logic of SMC convention to properly support older QCOM secure worlds
>  - Boot tested on IFC6410 based on linaro kernel tag:
>    debian-qcom-dragonboard410c-18.01 (which does basic verification of legacy
>    SCM calls: at least warm_boot_addr, cold_boot_addr, and power_down)
> 
> Elliot Berman (17):
>   firmware: qcom_scm: Rename macros and structures
>   firmware: qcom_scm: Apply consistent naming scheme to command IDs
>   firmware: qcom_scm: Remove unused qcom_scm_get_version
>   firmware: qcom_scm-64: Make SMC macros less magical
>   firmware: qcom_scm-64: Move svc/cmd/owner into qcom_scm_desc
>   firmware: qcom_scm-64: Add SCM results struct
>   firmware: qcom_scm-64: Move SMC register filling to
>     qcom_scm_call_smccc
>   firmware: qcom_scm-64: Improve SMC convention detection
>   firmware: qcom_scm-32: Use SMC arch wrappers
>   firmware: qcom_scm-32: Add funcnum IDs
>   firmware: qcom_scm-32: Use qcom_scm_desc in non-atomic calls
>   firmware: qcom_scm-32: Move SMCCC register filling to qcom_scm_call
>   firmware: qcom_scm-32: Create common legacy atomic call
>   firmware: qcom_scm-32: Add device argument to atomic calls
>   firmware: qcom_scm: Order functions, definitions by service/command
>   firmware: qcom_scm: Remove thin wrappers
>   firmware: qcom_scm: Dynamically support SMCCC and legacy conventions
> 
>  drivers/firmware/Kconfig           |   8 -
>  drivers/firmware/Makefile          |   5 +-
>  drivers/firmware/qcom_scm-32.c     | 671 -----------------------------
>  drivers/firmware/qcom_scm-64.c     | 579 -------------------------
>  drivers/firmware/qcom_scm-legacy.c | 242 +++++++++++
>  drivers/firmware/qcom_scm-smc.c    | 151 +++++++
>  drivers/firmware/qcom_scm.c        | 854 +++++++++++++++++++++++++++++--------
>  drivers/firmware/qcom_scm.h        | 178 ++++----
>  include/linux/qcom_scm.h           | 125 +++---
>  9 files changed, 1232 insertions(+), 1581 deletions(-)
>  delete mode 100644 drivers/firmware/qcom_scm-32.c
>  delete mode 100644 drivers/firmware/qcom_scm-64.c
>  create mode 100644 drivers/firmware/qcom_scm-legacy.c
>  create mode 100644 drivers/firmware/qcom_scm-smc.c
> 
> -- 
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