linux-kernel - [PATCH v18 1/3] vfio/pci: rename and export do_io

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Message-ID: <20240216030128.29154-2-ankita@nvidia.com>
Date: Fri, 16 Feb 2024 08:31:26 +0530
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>, <mst@...hat.com>, <eric.auger@...hat.com>,
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CC: <aniketa@...dia.com>, <cjia@...dia.com>, <kwankhede@...dia.com>,
	<targupta@...dia.com>, <vsethi@...dia.com>, <acurrid@...dia.com>,
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Subject: [PATCH v18 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.

Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-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 07fea08ea8a2..03b8f7ada1ac 100644
--- a/drivers/vfio/pci/vfio_pci_rdwr.c
+++ b/drivers/vfio/pci/vfio_pci_rdwr.c
@@ -96,10 +96,10 @@ 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;
@@ -201,6 +201,7 @@ 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);
 
 int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar)
 {
@@ -279,8 +280,8 @@ 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;
@@ -348,7 +349,8 @@ 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 85e84b92751b..cf9480a31f3e 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -130,7 +130,10 @@ 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);
-
+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);
 #define VFIO_IOWRITE_DECLATION(size) \
 int vfio_pci_core_iowrite##size(struct vfio_pci_core_device *vdev,	\
 			bool test_mem, u##size val, void __iomem *io);
-- 
2.34.1