linux-kernel - [PATCH v4 0/2] Allow parameter in smc/hvc calls

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Message-ID: <20230418185659.29745-1-quic_nkela@quicinc.com>
Date:   Tue, 18 Apr 2023 11:56:57 -0700
From:   Nikunj Kela <quic_nkela@...cinc.com>
To:     <sudeep.holla@....com>
CC:     <cristian.marussi@....com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Nikunj Kela <quic_nkela@...cinc.com>
Subject: [PATCH v4 0/2] Allow parameter in smc/hvc calls

Currently, smc/hvc calls are made with parameters set
to zeros. We are using multiple scmi instances within
a VM. We are sharing the same smc-id(func_id) with all
scmi instance. The hypervisor needs a way to distinguish
among hvc calls made from different instances.

This patch series introduces new compatible string which
can be used to pass shmem channel address as parameters
to smc/hvc calls.

---
v4 -> split shmem address into 4KB-pages and offset

v3 -> pass shmem channel address as parameter

v2 -> fix the compilation erros on 32bit platform(see below)
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202304100606.kUjhsRYf-lkp@intel.com/

v1 -> original patches

Nikunj Kela (2):
  dt-bindings: firmware: arm,scmi: support for parameter in smc/hvc call
  firmware: arm_scmi: Augment SMC/HVC to allow optional parameters

 .../devicetree/bindings/firmware/arm,scmi.yaml     |  8 +++++++-
 drivers/firmware/arm_scmi/driver.c                 |  1 +
 drivers/firmware/arm_scmi/smc.c                    | 14 +++++++++++++-
 3 files changed, 21 insertions(+), 2 deletions(-)

-- 
2.17.1