linux-kernel - [PATCH v16 1/3] vfio/pci: rename and export do_io

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Date: Mon, 15 Jan 2024 21:15:14 +0000
From: <ankita@...dia.com>
To: <ankita@...dia.com>, <jgg@...dia.com>, <alex.williamson@...hat.com>,
	<yishaih@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
	<kevin.tian@...el.com>, <eric.auger@...hat.com>, <brett.creeley@....com>,
	<horms@...nel.org>
CC: <aniketa@...dia.com>, <cjia@...dia.com>, <kwankhede@...dia.com>,
	<targupta@...dia.com>, <vsethi@...dia.com>, <acurrid@...dia.com>,
	<apopple@...dia.com>, <jhubbard@...dia.com>, <danw@...dia.com>,
	<anuaggarwal@...dia.com>, <mochs@...dia.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v16 1/3] vfio/pci: rename and export do_io_rw()

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

do_io_rw() is used to read/write to the device MMIO. The grace hopper
VFIO PCI variant driver require this functionality to read/write to
its memory.

Rename this as vfio_pci_core functions and export as GPL.

Signed-off-by: Ankit Agrawal <ankita@...dia.com>
Tested-by: Ankit Agrawal <ankita@...dia.com>
---
 drivers/vfio/pci/vfio_pci_rdwr.c | 16 +++++++++-------
 include/linux/vfio_pci_core.h    |  5 ++++-
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
index e27de61ac9fe..15484e27b26f 100644
--- a/drivers/vfio/pci/vfio_pci_rdwr.c
+++ b/drivers/vfio/pci/vfio_pci_rdwr.c
@@ -94,10 +94,10 @@ VFIO_IOREAD(32)
  * reads with -1.  This is intended for handling MSI-X vector tables and
  * leftover space for ROM BARs.
  */
-static ssize_t 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,
-			size_t x_end, bool iswrite)
+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,
+			       size_t x_end, bool iswrite)
 {
 	ssize_t done = 0;
 	int ret;
@@ -199,6 +199,7 @@ static ssize_t do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
 
 	return done;
 }
+EXPORT_SYMBOL_GPL(vfio_pci_core_do_io_rw);
 
 static int vfio_pci_setup_barmap(struct vfio_pci_core_device *vdev, int bar)
 {
@@ -276,8 +277,8 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 		x_end = vdev->msix_offset + vdev->msix_size;
 	}
 
-	done = do_io_rw(vdev, res->flags & IORESOURCE_MEM, io, buf, pos,
-			count, x_start, x_end, iswrite);
+	done = vfio_pci_core_do_io_rw(vdev, res->flags & IORESOURCE_MEM, io, buf, pos,
+				      count, x_start, x_end, iswrite);
 
 	if (done >= 0)
 		*ppos += done;
@@ -345,7 +346,8 @@ ssize_t vfio_pci_vga_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 	 * probing, so we don't currently worry about access in relation
 	 * to the memory enable bit in the command register.
 	 */
-	done = do_io_rw(vdev, false, iomem, buf, off, count, 0, 0, iswrite);
+	done = vfio_pci_core_do_io_rw(vdev, false, iomem, buf, off, count,
+				      0, 0, iswrite);
 
 	vga_put(vdev->pdev, rsrc);
 
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index 562e8754869d..d478e6f1be02 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -129,5 +129,8 @@ void vfio_pci_core_disable(struct vfio_pci_core_device *vdev);
 void vfio_pci_core_finish_enable(struct vfio_pci_core_device *vdev);
 pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev *pdev,
 						pci_channel_state_t state);
-
+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,
+			       size_t x_end, bool iswrite);
 #endif /* VFIO_PCI_CORE_H */
-- 
2.34.1