linux-kernel - [RFC, v1 0/3] msi support for platform devices

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Date:   Thu, 12 Nov 2020 23:28:49 +0530
From:   Vikas Gupta <vikas.gupta@...adcom.com>
To:     eric.auger@...hat.com, alex.williamson@...hat.com,
        cohuck@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     vikram.prakash@...adcom.com, srinath.mannam@...adcom.com,
        Vikas Gupta <vikas.gupta@...adcom.com>
Subject: [RFC, v1 0/3] msi support for platform devices

This RFC adds support for MSI for platform devices.
a) MSI(s) is/are added in addition to the normal interrupts.
b) The vendor specific MSI configuration can be done using
   callbacks which is implemented as msi module.
c) Adds a msi handling module for the Broadcom platform devices.

Changes from:
-------------
 v0 to v1:
   i)  Removed MSI device flag VFIO_DEVICE_FLAGS_MSI.
   ii) Add MSI(s) at the end of the irq list of platform IRQs.
       MSI(s) with first entry of MSI block has count and flag
       information.
       IRQ list: Allocation for IRQs + MSIs are allocated as below
       Example: if there are 'n' IRQs and 'k' MSIs
       -------------------------------------------------------
       |IRQ-0|IRQ-1|....|IRQ-n|MSI-0|MSI-1|MSI-2|......|MSI-k|
       -------------------------------------------------------
       MSI-0 will have count=k set and flags set accordingly.

Vikas Gupta (3):
  vfio/platform: add support for msi
  vfio/platform: change cleanup order
  vfio/platform: add Broadcom msi module

 drivers/vfio/platform/Kconfig                 |   1 +
 drivers/vfio/platform/Makefile                |   1 +
 drivers/vfio/platform/msi/Kconfig             |   9 +
 drivers/vfio/platform/msi/Makefile            |   2 +
 .../vfio/platform/msi/vfio_platform_bcmplt.c  |  74 ++++++
 drivers/vfio/platform/vfio_platform_common.c  |  86 ++++++-
 drivers/vfio/platform/vfio_platform_irq.c     | 238 +++++++++++++++++-
 drivers/vfio/platform/vfio_platform_private.h |  23 ++
 8 files changed, 419 insertions(+), 15 deletions(-)
 create mode 100644 drivers/vfio/platform/msi/Kconfig
 create mode 100644 drivers/vfio/platform/msi/Makefile
 create mode 100644 drivers/vfio/platform/msi/vfio_platform_bcmplt.c

-- 
2.17.1


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