[PATCH v2 0/2] SCM: Support latest version of waitq-aware firmware

[Unnathi Chalicheemala <quic_uchalich@quicinc.com>]

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.

The macros defined in the first patch are only used in SCM driver and will
be dropped once Gunyah hypervisor driver patches are merged as fill_irq_fwspec_params()
is reused from here:
https://lore.kernel.org/all/20240405081735319-0700.eberman@hu-eberman-lv.qualcomm.com/

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

---
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 | 135 ++++++++++++++++++++++++++-----
 drivers/firmware/qcom/qcom_scm.h |   1 +
 2 files changed, 116 insertions(+), 20 deletions(-)

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2.34.1