linux-kernel - [PATCH v4 0/2] SCM: Support latest version of waitq-aware firmware

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Message-Id: <cover.1730742637.git.quic_uchalich@quicinc.com>
Date: Mon,  4 Nov 2024 10:01:36 -0800
From: Unnathi Chalicheemala <quic_uchalich@...cinc.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: Unnathi Chalicheemala <quic_uchalich@...cinc.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...cinc.com
Subject: [PATCH v4 0/2] SCM: Support latest version of waitq-aware firmware

This series adds support for the latest improvements made in SCM
firmware that allow for multiple wait-queues in firmware.

To support multi VM synchronization when VMs make SMC calls on same CPU,
waitqueue mechanism is added in firmware which runs at EL2 & EL3 exception
levels.

P.S. While at Qualcomm, Guru Das Srinagesh authored the initial version of
these patches.
Thanks Guru!

---
Changes in v4:
- Moving back to redefining GIC_IRQ_TYPE_SPI and GIC_IRQ_TYPE_ESPI macros
in qcom_scm as seeing compilation issues in linux/irq.h when including
arm-gic header. Will send a fixes patch and move to dt-bindings in next patchset. 
- Fixed a few compilation errors.
- Link to v3: https://lore.kernel.org/all/cover.1730735881.git.quic_uchalich@quicinc.com/

Changes in v3:
- Use GIC_SPI and GIC_ESPI macros from dt-bindings instead of redefining
- Prettified qcom_scm_fill_irq_fwspec_params()
- Moved waitq initialization before smp_store_release()
- There is no Gunyah hypercall API that can be used to fetch IRQ information hence
introducing new SCM call.
- Link to v2: https://lore.kernel.org/all/cover.1724968351.git.quic_uchalich@quicinc.com/

Changes in v2:
- Dropped "Initialize waitq before setting global __scm" as it was merged here:
https://lore.kernel.org/r/1711034642-22860-4-git-send-email-quic_mojha@quicinc.com
- Decoupled "Remove QCOM_SMC_WAITQ_FLAG_WAKE_ALL" from series
- Converted xarray to a statically sized array
- Initialize waitq array in probe function
- Remove reinit of waitq completion struct in scm_get_completion()
- Introduced new APIs to get no. of waitqueue contexts and waitqueue IRQ no.
directly from firmware.
- Link to v1: https://lore.kernel.org/all/20240228-multi_waitq-v1-0-ccb096419af0@quicinc.com/

Unnathi Chalicheemala (2):
  firmware: qcom_scm: Add API to get waitqueue IRQ info
  firmware: qcom_scm: Support multiple waitq contexts

 drivers/firmware/qcom/qcom_scm.c | 122 ++++++++++++++++++++++++++-----
 drivers/firmware/qcom/qcom_scm.h |   1 +
 2 files changed, 104 insertions(+), 19 deletions(-)

-- 
2.34.1