linux-kernel - [PATCH 09/10] vfio/pci: Share the core device pointer while invoking feature functions

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Message-ID: <19f71a0f4d1a5db8c712cb4d094ccf2f10dc22c5.1753274085.git.leonro@nvidia.com>
Date: Wed, 23 Jul 2025 16:00:10 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Christoph Hellwig <hch@....de>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org,
	iommu@...ts.linux.dev,
	Jens Axboe <axboe@...nel.dk>,
	Jérôme Glisse <jglisse@...hat.com>,
	Joerg Roedel <joro@...tes.org>,
	kvm@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	linux-mm@...ck.org,
	linux-pci@...r.kernel.org,
	Logan Gunthorpe <logang@...tatee.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Will Deacon <will@...nel.org>
Subject: [PATCH 09/10] vfio/pci: Share the core device pointer while invoking feature functions

From: Vivek Kasireddy <vivek.kasireddy@...el.com>

There is no need to share the main device pointer (struct vfio_device *)
with all the feature functions as they only need the core device
pointer. Therefore, extract the core device pointer once in the
caller (vfio_pci_core_ioctl_feature) and share it instead.

Signed-off-by: Vivek Kasireddy <vivek.kasireddy@...el.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/vfio/pci/vfio_pci_core.c | 30 +++++++++++++-----------------
 1 file changed, 13 insertions(+), 17 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index 1e675daab5753..5512d13bb8899 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -301,11 +301,9 @@ static int vfio_pci_runtime_pm_entry(struct vfio_pci_core_device *vdev,
 	return 0;
 }
 
-static int vfio_pci_core_pm_entry(struct vfio_device *device, u32 flags,
+static int vfio_pci_core_pm_entry(struct vfio_pci_core_device *vdev, u32 flags,
 				  void __user *arg, size_t argsz)
 {
-	struct vfio_pci_core_device *vdev =
-		container_of(device, struct vfio_pci_core_device, vdev);
 	int ret;
 
 	ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_SET, 0);
@@ -322,12 +320,10 @@ static int vfio_pci_core_pm_entry(struct vfio_device *device, u32 flags,
 }
 
 static int vfio_pci_core_pm_entry_with_wakeup(
-	struct vfio_device *device, u32 flags,
+	struct vfio_pci_core_device *vdev, u32 flags,
 	struct vfio_device_low_power_entry_with_wakeup __user *arg,
 	size_t argsz)
 {
-	struct vfio_pci_core_device *vdev =
-		container_of(device, struct vfio_pci_core_device, vdev);
 	struct vfio_device_low_power_entry_with_wakeup entry;
 	struct eventfd_ctx *efdctx;
 	int ret;
@@ -378,11 +374,9 @@ static void vfio_pci_runtime_pm_exit(struct vfio_pci_core_device *vdev)
 	up_write(&vdev->memory_lock);
 }
 
-static int vfio_pci_core_pm_exit(struct vfio_device *device, u32 flags,
+static int vfio_pci_core_pm_exit(struct vfio_pci_core_device *vdev, u32 flags,
 				 void __user *arg, size_t argsz)
 {
-	struct vfio_pci_core_device *vdev =
-		container_of(device, struct vfio_pci_core_device, vdev);
 	int ret;
 
 	ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_SET, 0);
@@ -1475,11 +1469,10 @@ long vfio_pci_core_ioctl(struct vfio_device *core_vdev, unsigned int cmd,
 }
 EXPORT_SYMBOL_GPL(vfio_pci_core_ioctl);
 
-static int vfio_pci_core_feature_token(struct vfio_device *device, u32 flags,
-				       uuid_t __user *arg, size_t argsz)
+static int vfio_pci_core_feature_token(struct vfio_pci_core_device *vdev,
+				       u32 flags, uuid_t __user *arg,
+				       size_t argsz)
 {
-	struct vfio_pci_core_device *vdev =
-		container_of(device, struct vfio_pci_core_device, vdev);
 	uuid_t uuid;
 	int ret;
 
@@ -1506,16 +1499,19 @@ static int vfio_pci_core_feature_token(struct vfio_device *device, u32 flags,
 int vfio_pci_core_ioctl_feature(struct vfio_device *device, u32 flags,
 				void __user *arg, size_t argsz)
 {
+	struct vfio_pci_core_device *vdev =
+		container_of(device, struct vfio_pci_core_device, vdev);
+
 	switch (flags & VFIO_DEVICE_FEATURE_MASK) {
 	case VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY:
-		return vfio_pci_core_pm_entry(device, flags, arg, argsz);
+		return vfio_pci_core_pm_entry(vdev, flags, arg, argsz);
 	case VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP:
-		return vfio_pci_core_pm_entry_with_wakeup(device, flags,
+		return vfio_pci_core_pm_entry_with_wakeup(vdev, flags,
 							  arg, argsz);
 	case VFIO_DEVICE_FEATURE_LOW_POWER_EXIT:
-		return vfio_pci_core_pm_exit(device, flags, arg, argsz);
+		return vfio_pci_core_pm_exit(vdev, flags, arg, argsz);
 	case VFIO_DEVICE_FEATURE_PCI_VF_TOKEN:
-		return vfio_pci_core_feature_token(device, flags, arg, argsz);
+		return vfio_pci_core_feature_token(vdev, flags, arg, argsz);
 	default:
 		return -ENOTTY;
 	}
-- 
2.50.1