diff mbox series

[v5,02/18] vfio: Move iova_bitmap into iommufd

Message ID 20231020222804.21850-3-joao.m.martins@oracle.com (mailing list archive)
State New, archived
Headers show
Series IOMMUFD Dirty Tracking | expand

Commit Message

Joao Martins Oct. 20, 2023, 10:27 p.m. UTC 
Both VFIO and IOMMUFD will need iova bitmap for storing dirties and walking
the user bitmaps, so move to the common dependency into IOMMUFD.  In doing
so, create the symbol IOMMUFD_DRIVER which designates the builtin code that
will be used by drivers when selected. Today this means MLX5_VFIO_PCI and
PDS_VFIO_PCI. IOMMU drivers will do the same (in future patches) when
supporting dirty tracking and select IOMMUFD_DRIVER accordingly.

Given that the symbol maybe be disabled, add header definitions in
iova_bitmap.h for when IOMMUFD_DRIVER=n

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
---
 drivers/iommu/iommufd/Kconfig                 |  4 +++
 drivers/iommu/iommufd/Makefile                |  1 +
 drivers/{vfio => iommu/iommufd}/iova_bitmap.c |  0
 drivers/vfio/Makefile                         |  3 +--
 drivers/vfio/pci/mlx5/Kconfig                 |  1 +
 drivers/vfio/pci/pds/Kconfig                  |  1 +
 include/linux/iova_bitmap.h                   | 26 +++++++++++++++++++
 7 files changed, 34 insertions(+), 2 deletions(-)
 rename drivers/{vfio => iommu/iommufd}/iova_bitmap.c (100%)
diff mbox series

Patch

diff --git a/drivers/iommu/iommufd/Kconfig b/drivers/iommu/iommufd/Kconfig
index 99d4b075df49..1fa543204e89 100644
--- a/drivers/iommu/iommufd/Kconfig
+++ b/drivers/iommu/iommufd/Kconfig
@@ -11,6 +11,10 @@  config IOMMUFD
 
 	  If you don't know what to do here, say N.
 
+config IOMMUFD_DRIVER
+	bool
+	default n
+
 if IOMMUFD
 config IOMMUFD_VFIO_CONTAINER
 	bool "IOMMUFD provides the VFIO container /dev/vfio/vfio"
diff --git a/drivers/iommu/iommufd/Makefile b/drivers/iommu/iommufd/Makefile
index 8aeba81800c5..34b446146961 100644
--- a/drivers/iommu/iommufd/Makefile
+++ b/drivers/iommu/iommufd/Makefile
@@ -11,3 +11,4 @@  iommufd-y := \
 iommufd-$(CONFIG_IOMMUFD_TEST) += selftest.o
 
 obj-$(CONFIG_IOMMUFD) += iommufd.o
+obj-$(CONFIG_IOMMUFD_DRIVER) += iova_bitmap.o
diff --git a/drivers/vfio/iova_bitmap.c b/drivers/iommu/iommufd/iova_bitmap.c
similarity index 100%
rename from drivers/vfio/iova_bitmap.c
rename to drivers/iommu/iommufd/iova_bitmap.c
diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
index c82ea032d352..68c05705200f 100644
--- a/drivers/vfio/Makefile
+++ b/drivers/vfio/Makefile
@@ -1,8 +1,7 @@ 
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_VFIO) += vfio.o
 
-vfio-y += vfio_main.o \
-	  iova_bitmap.o
+vfio-y += vfio_main.o
 vfio-$(CONFIG_VFIO_DEVICE_CDEV) += device_cdev.o
 vfio-$(CONFIG_VFIO_GROUP) += group.o
 vfio-$(CONFIG_IOMMUFD) += iommufd.o
diff --git a/drivers/vfio/pci/mlx5/Kconfig b/drivers/vfio/pci/mlx5/Kconfig
index 7088edc4fb28..c3ced56b7787 100644
--- a/drivers/vfio/pci/mlx5/Kconfig
+++ b/drivers/vfio/pci/mlx5/Kconfig
@@ -3,6 +3,7 @@  config MLX5_VFIO_PCI
 	tristate "VFIO support for MLX5 PCI devices"
 	depends on MLX5_CORE
 	select VFIO_PCI_CORE
+	select IOMMUFD_DRIVER
 	help
 	  This provides migration support for MLX5 devices using the VFIO
 	  framework.
diff --git a/drivers/vfio/pci/pds/Kconfig b/drivers/vfio/pci/pds/Kconfig
index 407b3fd32733..fff368a8183b 100644
--- a/drivers/vfio/pci/pds/Kconfig
+++ b/drivers/vfio/pci/pds/Kconfig
@@ -5,6 +5,7 @@  config PDS_VFIO_PCI
 	tristate "VFIO support for PDS PCI devices"
 	depends on PDS_CORE
 	select VFIO_PCI_CORE
+	select IOMMUFD_DRIVER
 	help
 	  This provides generic PCI support for PDS devices using the VFIO
 	  framework.
diff --git a/include/linux/iova_bitmap.h b/include/linux/iova_bitmap.h
index c006cf0a25f3..1c338f5e5b7a 100644
--- a/include/linux/iova_bitmap.h
+++ b/include/linux/iova_bitmap.h
@@ -7,6 +7,7 @@ 
 #define _IOVA_BITMAP_H_
 
 #include <linux/types.h>
+#include <linux/errno.h>
 
 struct iova_bitmap;
 
@@ -14,6 +15,7 @@  typedef int (*iova_bitmap_fn_t)(struct iova_bitmap *bitmap,
 				unsigned long iova, size_t length,
 				void *opaque);
 
+#if IS_ENABLED(CONFIG_IOMMUFD_DRIVER)
 struct iova_bitmap *iova_bitmap_alloc(unsigned long iova, size_t length,
 				      unsigned long page_size,
 				      u64 __user *data);
@@ -22,5 +24,29 @@  int iova_bitmap_for_each(struct iova_bitmap *bitmap, void *opaque,
 			 iova_bitmap_fn_t fn);
 void iova_bitmap_set(struct iova_bitmap *bitmap,
 		     unsigned long iova, size_t length);
+#else
+static inline struct iova_bitmap *iova_bitmap_alloc(unsigned long iova,
+						    size_t length,
+						    unsigned long page_size,
+						    u64 __user *data)
+{
+	return NULL;
+}
+
+static inline void iova_bitmap_free(struct iova_bitmap *bitmap)
+{
+}
+
+static inline int iova_bitmap_for_each(struct iova_bitmap *bitmap, void *opaque,
+				       iova_bitmap_fn_t fn)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void iova_bitmap_set(struct iova_bitmap *bitmap,
+				   unsigned long iova, size_t length)
+{
+}
+#endif
 
 #endif