linux-kernel - [PATCH v2] MHI event ring priority updates

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Message-Id: <1624053903-24653-1-git-send-email-bbhatt@codeaurora.org>
Date:   Fri, 18 Jun 2021 15:05:02 -0700
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     manivannan.sadhasivam@...aro.org
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org, Bhaumik Bhatt <bbhatt@...eaurora.org>
Subject: [PATCH v2] MHI event ring priority updates

Event ring priorities have remained out of use and are set to 1 by default.
This series brings about an enum entry expanding use of the priority field by
adding high priority tasklet scheduling to the menu.

In some cases, tasklet scheduling delays can be a nuisance. An example would be
ath11k adding a610f3c65d3b ("bus: mhi: Wait for M2 state during system resume")
in response to it. This issue can be potentially avoided if the controller uses
a dedicated event ring for control packets with high priority tasklet scheduling
in place.

There are no functional changes added to the controller (pci_generic or ath11k)
drivers with this series and the only changes there are use of the enum in place
of a harcoded value of "1". In the future, controllers can opt in to have any
event ring scheduled in high priority.

Tested on: X86_64 architecture with SDX65 on Ubuntu 18.04 distribution.

v2:
-Remove enum and update kernel doc for priority simplifying the implementation
-Drop patches for controller changes as they become unnecessary
-Merge adding and enabling of support patches

Hemant Kumar (1):
  bus: mhi: core: Add support for processing priority of event ring

 drivers/bus/mhi/core/init.c | 3 +--
 drivers/bus/mhi/core/main.c | 9 +++++++--
 include/linux/mhi.h         | 2 +-
 3 files changed, 9 insertions(+), 5 deletions(-)

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