linux-kernel - [PATCH v6 1/5] vfio/mdev: Register mdev bus earlier during boot

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Date:   Fri, 30 Oct 2020 12:58:05 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Liu Yi L <yi.l.liu@...el.com>, Zeng Xin <xin.zeng@...el.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v6 1/5] vfio/mdev: Register mdev bus earlier during boot

Move mdev bus registration earlier than IOMMU probe processing so that
the IOMMU drivers could be able to set iommu_ops for the mdev bus. This
only applies when vfio-mdev module is setected to be built-in.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/vfio/mdev/mdev_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index b558d4cfd082..6b9ab71f89e7 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -417,8 +417,12 @@ static void __exit mdev_exit(void)
 	mdev_bus_unregister();
 }
 
+#if IS_BUILTIN(CONFIG_VFIO_MDEV)
+postcore_initcall(mdev_init)
+#else
 module_init(mdev_init)
 module_exit(mdev_exit)
+#endif /* IS_BUILTIN(CONFIG_VFIO_MDEV) */
 
 MODULE_VERSION(DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
-- 
2.25.1