linux-kernel - [PATCH v2 4/6] vfio: export vfio_find_cap

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Message-ID: <20251118074422.58081-5-ankita@nvidia.com>
Date: Tue, 18 Nov 2025 07:44:20 +0000
From: <ankita@...dia.com>
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Subject: [PATCH v2 4/6] vfio: export vfio_find_cap_start

From: Ankit Agrawal <ankita@...dia.com>

Export vfio_find_cap_start to be used by the nvgrace-gpu module.
This would be used to determine GPU FLR requests.

Signed-off-by: Ankit Agrawal <ankita@...dia.com>
---
 drivers/vfio/pci/vfio_pci_config.c | 3 ++-
 include/linux/vfio_pci_core.h      | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 333fd149c21a..50390189b586 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1114,7 +1114,7 @@ int __init vfio_pci_init_perm_bits(void)
 	return ret;
 }
 
-static int vfio_find_cap_start(struct vfio_pci_core_device *vdev, int pos)
+int vfio_find_cap_start(struct vfio_pci_core_device *vdev, int pos)
 {
 	u8 cap;
 	int base = (pos >= PCI_CFG_SPACE_SIZE) ? PCI_CFG_SPACE_SIZE :
@@ -1130,6 +1130,7 @@ static int vfio_find_cap_start(struct vfio_pci_core_device *vdev, int pos)
 
 	return pos;
 }
+EXPORT_SYMBOL_GPL(vfio_find_cap_start);
 
 static int vfio_msi_config_read(struct vfio_pci_core_device *vdev, int pos,
 				int count, struct perm_bits *perm,
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index 058acded858b..a097a66485b4 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -132,6 +132,7 @@ void vfio_pci_core_finish_enable(struct vfio_pci_core_device *vdev);
 int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar);
 pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev *pdev,
 						pci_channel_state_t state);
+int vfio_find_cap_start(struct vfio_pci_core_device *vdev, int pos);
 ssize_t vfio_pci_core_do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
 			       void __iomem *io, char __user *buf,
 			       loff_t off, size_t count, size_t x_start,
-- 
2.34.1