linux-kernel - [PATCH v3] add support for pci in the pvpanic driver

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Date:   Fri, 12 Feb 2021 21:32:25 +0200
From:   Mihai Carabas <mihai.carabas@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, arnd@...db.de, rdunlap@...radead.org,
        bobo.shaobowang@...wei.com,
        Mihai Carabas <mihai.carabas@...cle.com>
Subject: [PATCH v3] add support for pci in the pvpanic driver

This patchset adds support for PCI in the pvpanic driver. The device already
got in qemu [1].

v2:
- mmio -> MMIO, pci -> PCI suggested by Randy Dunlap.
- group pvpanic-common.c and mmio.c in the same module. The intention was to
  have only one module and the common code splitted up to be re-used by the
  pvpanic-pci module in the next patch.
- add a new patch where add the licenses for the new files (when I moved the
  code to mmio.c I preserved the original licenses there)
- properly clean-up PCI device when driver removed.

v3:
- drop patch 3 with licenses and add them when creating files
- create a new patch (2/3) which allowes multiple pvpanic instances

How to test:

Run a VM with latest qemu which has the pvpanic-pci device:
qemu-system-aarch64  -device pvpanic-pci

Generate a panic in the guest:
echo 1 > /proc/sys/kernel/sysrq
echo c > /proc/sysrq-trigger

Observe in the QMP console the panic events received by the device:

{"timestamp": {"seconds": 1613122186, "microseconds": 141729}, "event":
"GUEST_PANICKED", "data": {"action": "pause"}}

{"timestamp": {"seconds": 1613122186, "microseconds": 141833}, "event":
"GUEST_PANICKED", "data": {"action": "poweroff"}}

{"timestamp": {"seconds": 1613122186, "microseconds": 141896}, "event":
"SHUTDOWN", "data": {"guest": true, "reason": "guest-panic"}}


[1] https://github.com/qemu/qemu/commit/9df52f58e76e904fb141b10318362d718f470db2


Mihai Carabas (3):
  misc/pvpanic: split-up generic and platform dependent code
  misc/pvpanic: probe multiple instances
  misc/pvpanic: add PCI driver

 drivers/misc/Kconfig                |   9 +--
 drivers/misc/Makefile               |   2 +-
 drivers/misc/pvpanic.c              | 111 ---------------------------------
 drivers/misc/pvpanic/Kconfig        |  25 ++++++++
 drivers/misc/pvpanic/Makefile       |   9 +++
 drivers/misc/pvpanic/pvpanic-mmio.c |  82 ++++++++++++++++++++++++
 drivers/misc/pvpanic/pvpanic-pci.c  |  54 ++++++++++++++++
 drivers/misc/pvpanic/pvpanic.c      | 120 ++++++++++++++++++++++++++++++++++++
 drivers/misc/pvpanic/pvpanic.h      |  16 +++++
 9 files changed, 308 insertions(+), 120 deletions(-)
 delete mode 100644 drivers/misc/pvpanic.c
 create mode 100644 drivers/misc/pvpanic/Kconfig
 create mode 100644 drivers/misc/pvpanic/Makefile
 create mode 100644 drivers/misc/pvpanic/pvpanic-mmio.c
 create mode 100644 drivers/misc/pvpanic/pvpanic-pci.c
 create mode 100644 drivers/misc/pvpanic/pvpanic.c
 create mode 100644 drivers/misc/pvpanic/pvpanic.h

-- 
1.8.3.1