linux-kernel - [PATCH v10 19/20] vfio: initialize the virqfd workqueue in VFIO generic code

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Date:	Thu, 27 Nov 2014 18:32:59 +0100
From:	Antonios Motakis <a.motakis@...tualopensystems.com>
To:	kvmarm@...ts.cs.columbia.edu, iommu@...ts.linux-foundation.org,
	alex.williamson@...hat.com
Cc:	will.deacon@....com, tech@...tualopensystems.com,
	christoffer.dall@...aro.org, eric.auger@...aro.org,
	kim.phillips@...escale.com, marc.zyngier@....com,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kvm@...r.kernel.org (open list:VFIO DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v10 19/20] vfio: initialize the virqfd workqueue in VFIO generic code

Now we have finally completely decoupled virqfd from VFIO_PCI. We can
initialize it from the VFIO generic code, in order to safely use it from
multiple independent VFIO bus drivers.

Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
---
 drivers/vfio/Makefile       | 4 +++-
 drivers/vfio/pci/Makefile   | 3 +--
 drivers/vfio/pci/vfio_pci.c | 8 --------
 drivers/vfio/vfio.c         | 8 ++++++++
 4 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
index dadf0ca..d798b09 100644
--- a/drivers/vfio/Makefile
+++ b/drivers/vfio/Makefile
@@ -1,4 +1,6 @@
-obj-$(CONFIG_VFIO) += vfio.o
+vfio_core-y := vfio.o virqfd.o
+
+obj-$(CONFIG_VFIO) += vfio_core.o
 obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
 obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o
 obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spapr_eeh.o
diff --git a/drivers/vfio/pci/Makefile b/drivers/vfio/pci/Makefile
index c7c8644..1310792 100644
--- a/drivers/vfio/pci/Makefile
+++ b/drivers/vfio/pci/Makefile
@@ -1,5 +1,4 @@
 
-vfio-pci-y := vfio_pci.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o \
-	      ../virqfd.o
+vfio-pci-y := vfio_pci.o vfio_pci_intrs.o vfio_pci_rdwr.o vfio_pci_config.o
 
 obj-$(CONFIG_VFIO_PCI) += vfio-pci.o
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index fc4308c..8d156d7 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1012,7 +1012,6 @@ put_devs:
 static void __exit vfio_pci_cleanup(void)
 {
 	pci_unregister_driver(&vfio_pci_driver);
-	vfio_virqfd_exit();
 	vfio_pci_uninit_perm_bits();
 }
 
@@ -1025,11 +1024,6 @@ static int __init vfio_pci_init(void)
 	if (ret)
 		return ret;
 
-	/* Start the virqfd cleanup handler */
-	ret = vfio_virqfd_init();
-	if (ret)
-		goto out_virqfd;
-
 	/* Register and scan for devices */
 	ret = pci_register_driver(&vfio_pci_driver);
 	if (ret)
@@ -1038,8 +1032,6 @@ static int __init vfio_pci_init(void)
 	return 0;
 
 out_driver:
-	vfio_virqfd_exit();
-out_virqfd:
 	vfio_pci_uninit_perm_bits();
 	return ret;
 }
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index f018d8d..8e84471 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1464,6 +1464,11 @@ static int __init vfio_init(void)
 	if (ret)
 		goto err_cdev_add;
 
+	/* Start the virqfd cleanup handler used by some VFIO bus drivers */
+	ret = vfio_virqfd_init();
+	if (ret)
+		goto err_virqfd;
+
 	pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 
 	/*
@@ -1476,6 +1481,8 @@ static int __init vfio_init(void)
 
 	return 0;
 
+err_virqfd:
+	cdev_del(&vfio.group_cdev);
 err_cdev_add:
 	unregister_chrdev_region(vfio.group_devt, MINORMASK);
 err_alloc_chrdev:
@@ -1490,6 +1497,7 @@ static void __exit vfio_cleanup(void)
 {
 	WARN_ON(!list_empty(&vfio.group_list));
 
+	vfio_virqfd_exit();
 	idr_destroy(&vfio.group_idr);
 	cdev_del(&vfio.group_cdev);
 	unregister_chrdev_region(vfio.group_devt, MINORMASK);
-- 
2.1.3

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