linux-kernel - [PATCH RFCv2 12/13] vfio-iommufd: Provide another layer of msi

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Message-ID: <02a1e86d551fa1660d3e64be33bed4d7d5b8ab94.1736550979.git.nicolinc@nvidia.com>
Date: Fri, 10 Jan 2025 19:32:28 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>, <jgg@...dia.com>,
	<kevin.tian@...el.com>, <tglx@...utronix.de>, <maz@...nel.org>,
	<alex.williamson@...hat.com>
CC: <joro@...tes.org>, <shuah@...nel.org>, <reinette.chatre@...el.com>,
	<eric.auger@...hat.com>, <yebin10@...wei.com>, <apatel@...tanamicro.com>,
	<shivamurthy.shastri@...utronix.de>, <bhelgaas@...gle.com>,
	<anna-maria@...utronix.de>, <yury.norov@...il.com>, <nipun.gupta@....com>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kvm@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <patches@...ts.linux.dev>,
	<jean-philippe@...aro.org>, <mdf@...nel.org>, <mshavit@...gle.com>,
	<shameerali.kolothum.thodi@...wei.com>, <smostafa@...gle.com>,
	<ddutile@...hat.com>
Subject: [PATCH RFCv2 12/13] vfio-iommufd: Provide another layer of msi_iova helpers

As the bridge between iommufd core and vfio core, add a set of msi_iova
helpers to call the new msi_iova helpers from the iommufd_device level.

The next patch will use this bridging helpers in vfio-pci code.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/vfio.h   | 25 +++++++++++++++++++++++++
 drivers/vfio/iommufd.c | 27 +++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 000a6cab2d31..f38a1e910a2f 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -133,6 +133,12 @@ struct vfio_device_ops {
 
 #if IS_ENABLED(CONFIG_IOMMUFD)
 struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev);
+int vfio_iommufd_device_set_num_msi_iovas(struct vfio_device *vdev,
+					  unsigned int num);
+int vfio_iommufd_device_set_msi_iova(struct vfio_device *vdev,
+				     unsigned int index, dma_addr_t iova);
+void vfio_iommufd_device_unset_msi_iova(struct vfio_device *vdev,
+					unsigned int index);
 int vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx);
 int vfio_iommufd_physical_bind(struct vfio_device *vdev,
 			       struct iommufd_ctx *ictx, u32 *out_device_id);
@@ -151,6 +157,25 @@ vfio_iommufd_device_ictx(struct vfio_device *vdev)
 	return NULL;
 }
 
+static inline int
+vfio_iommufd_device_set_num_msi_iovas(struct vfio_device *vdev,
+				      unsigned int num)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline int vfio_iommufd_device_set_msi_iova(struct vfio_device *vdev,
+						   unsigned int index,
+						   dma_addr_t iova)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline void vfio_iommufd_device_unset_msi_iova(struct vfio_device *vdev,
+						      unsigned int index)
+{
+}
+
 static inline int
 vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
 {
diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c
index 516294fd901b..805efdbccc97 100644
--- a/drivers/vfio/iommufd.c
+++ b/drivers/vfio/iommufd.c
@@ -69,6 +69,33 @@ struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev)
 }
 EXPORT_SYMBOL_GPL(vfio_iommufd_device_ictx);
 
+int vfio_iommufd_device_set_num_msi_iovas(struct vfio_device *vdev,
+					  unsigned int num)
+{
+	if (!vdev->iommufd_device)
+		return -ENODEV;
+	return iommufd_device_set_num_msi_iovas(vdev->iommufd_device, num);
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_device_set_num_msi_iovas);
+
+int vfio_iommufd_device_set_msi_iova(struct vfio_device *vdev,
+				     unsigned int index, dma_addr_t iova)
+{
+	if (!vdev->iommufd_device)
+		return -ENODEV;
+	return iommufd_device_set_msi_iova(vdev->iommufd_device, index, iova);
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_device_set_msi_iova);
+
+void vfio_iommufd_device_unset_msi_iova(struct vfio_device *vdev,
+					unsigned int index)
+{
+	if (!vdev->iommufd_device)
+		return;
+	iommufd_device_unset_msi_iova(vdev->iommufd_device, index);
+}
+EXPORT_SYMBOL_GPL(vfio_iommufd_device_unset_msi_iova);
+
 static int vfio_iommufd_device_id(struct vfio_device *vdev)
 {
 	if (vdev->iommufd_device)
-- 
2.43.0