From 42ac9bd18d4fc28c36c7927847f0f6e90ecd7710 Mon Sep 17 00:00:00 2001 From: Antonios Motakis Date: Mon, 16 Mar 2015 14:08:54 -0600 Subject: 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 Signed-off-by: Baptiste Reynal Reviewed-by: Eric Auger Tested-by: Eric Auger Signed-off-by: Alex Williamson --- drivers/vfio/vfio.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/vfio/vfio.c') diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 4cde85501444..23ba12afe01f 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1553,6 +1553,11 @@ 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"); /* @@ -1565,6 +1570,8 @@ 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: @@ -1579,6 +1586,7 @@ 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); -- cgit v1.2.3-59-g8ed1b From 2f51bf4be99386f49841b6365a85a5cabc148565 Mon Sep 17 00:00:00 2001 From: Zhen Lei Date: Mon, 16 Mar 2015 14:08:56 -0600 Subject: vfio: put off the allocation of "minor" in vfio_create_group The next code fragment "list_for_each_entry" is not depend on "minor". With this patch, the free of "minor" in "list_for_each_entry" can be reduced, and there is no functional change. Signed-off-by: Zhen Lei Signed-off-by: Alex Williamson --- drivers/vfio/vfio.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) (limited to 'drivers/vfio/vfio.c') diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 23ba12afe01f..86aac7e4a050 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -234,22 +234,21 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group) mutex_lock(&vfio.group_lock); - minor = vfio_alloc_group_minor(group); - if (minor < 0) { - vfio_group_unlock_and_free(group); - return ERR_PTR(minor); - } - /* Did we race creating this group? */ list_for_each_entry(tmp, &vfio.group_list, vfio_next) { if (tmp->iommu_group == iommu_group) { vfio_group_get(tmp); - vfio_free_group_minor(minor); vfio_group_unlock_and_free(group); return tmp; } } + minor = vfio_alloc_group_minor(group); + if (minor < 0) { + vfio_group_unlock_and_free(group); + return ERR_PTR(minor); + } + dev = device_create(vfio.class, NULL, MKDEV(MAJOR(vfio.group_devt), minor), group, "%d", iommu_group_id(iommu_group)); -- cgit v1.2.3-59-g8ed1b From 71be3423a62be548c56bab5b818e1a1383e659d2 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Tue, 17 Mar 2015 08:33:38 -0600 Subject: vfio: Split virqfd into a separate module for vfio bus drivers An unintended consequence of commit 42ac9bd18d4f ("vfio: initialize the virqfd workqueue in VFIO generic code") is that the vfio module is renamed to vfio_core so that it can include both vfio and virqfd. That's a user visible change that may break module loading scritps and it imposes eventfd support as a dependency on the core vfio code, which it's really not. virqfd is intended to be provided as a service to vfio bus drivers, so instead of wrapping it into vfio.ko, we can make it a stand-alone module toggled by vfio bus drivers. This has the additional benefit of removing initialization and exit from the core vfio code. Signed-off-by: Alex Williamson --- drivers/vfio/Kconfig | 5 +++++ drivers/vfio/Makefile | 5 +++-- drivers/vfio/pci/Kconfig | 1 + drivers/vfio/platform/Kconfig | 1 + drivers/vfio/vfio.c | 8 -------- drivers/vfio/virqfd.c | 17 +++++++++++++++-- include/linux/vfio.h | 2 -- 7 files changed, 25 insertions(+), 14 deletions(-) (limited to 'drivers/vfio/vfio.c') diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig index d5322a434a7a..7d092ddc8119 100644 --- a/drivers/vfio/Kconfig +++ b/drivers/vfio/Kconfig @@ -13,6 +13,11 @@ config VFIO_SPAPR_EEH depends on EEH && VFIO_IOMMU_SPAPR_TCE default n +config VFIO_VIRQFD + tristate + depends on VFIO && EVENTFD + default n + menuconfig VFIO tristate "VFIO Non-Privileged userspace driver framework" depends on IOMMU_API diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile index d798b0959603..7b8a31f63fea 100644 --- a/drivers/vfio/Makefile +++ b/drivers/vfio/Makefile @@ -1,6 +1,7 @@ -vfio_core-y := vfio.o virqfd.o +vfio_virqfd-y := virqfd.o -obj-$(CONFIG_VFIO) += vfio_core.o +obj-$(CONFIG_VFIO) += vfio.o +obj-$(CONFIG_VFIO_VIRQFD) += vfio_virqfd.o obj-$(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/Kconfig b/drivers/vfio/pci/Kconfig index c6bb5da2d2a7..579d83bf5358 100644 --- a/drivers/vfio/pci/Kconfig +++ b/drivers/vfio/pci/Kconfig @@ -1,6 +1,7 @@ config VFIO_PCI tristate "VFIO support for PCI devices" depends on VFIO && PCI && EVENTFD + select VFIO_VIRQFD help Support for the PCI VFIO bus driver. This is required to make use of PCI drivers using the VFIO framework. diff --git a/drivers/vfio/platform/Kconfig b/drivers/vfio/platform/Kconfig index c0a3bff8baee..9a4403e2a36c 100644 --- a/drivers/vfio/platform/Kconfig +++ b/drivers/vfio/platform/Kconfig @@ -1,6 +1,7 @@ config VFIO_PLATFORM tristate "VFIO support for platform devices" depends on VFIO && EVENTFD && ARM + select VFIO_VIRQFD help Support for platform devices with VFIO. This is required to make use of platform devices present on the system using the VFIO diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 86aac7e4a050..0d336625ac71 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1552,11 +1552,6 @@ 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"); /* @@ -1569,8 +1564,6 @@ 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: @@ -1585,7 +1578,6 @@ 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); diff --git a/drivers/vfio/virqfd.c b/drivers/vfio/virqfd.c index 3d19aaf0e6c9..27c89cd5d70b 100644 --- a/drivers/vfio/virqfd.c +++ b/drivers/vfio/virqfd.c @@ -13,12 +13,17 @@ #include #include #include +#include #include +#define DRIVER_VERSION "0.1" +#define DRIVER_AUTHOR "Alex Williamson " +#define DRIVER_DESC "IRQFD support for VFIO bus drivers" + static struct workqueue_struct *vfio_irqfd_cleanup_wq; static DEFINE_SPINLOCK(virqfd_lock); -int __init vfio_virqfd_init(void) +static int __init vfio_virqfd_init(void) { vfio_irqfd_cleanup_wq = create_singlethread_workqueue("vfio-irqfd-cleanup"); @@ -28,7 +33,7 @@ int __init vfio_virqfd_init(void) return 0; } -void vfio_virqfd_exit(void) +static void __exit vfio_virqfd_exit(void) { destroy_workqueue(vfio_irqfd_cleanup_wq); } @@ -211,3 +216,11 @@ void vfio_virqfd_disable(struct virqfd **pvirqfd) flush_workqueue(vfio_irqfd_cleanup_wq); } EXPORT_SYMBOL_GPL(vfio_virqfd_disable); + +module_init(vfio_virqfd_init); +module_exit(vfio_virqfd_exit); + +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 683b5146022e..cbed15f194e0 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -142,8 +142,6 @@ struct virqfd { struct virqfd **pvirqfd; }; -extern int vfio_virqfd_init(void); -extern void vfio_virqfd_exit(void); extern int vfio_virqfd_enable(void *opaque, int (*handler)(void *, void *), void (*thread)(void *, void *), -- cgit v1.2.3-59-g8ed1b