[PATCH v17 2/3] vfio/pci: rename and export range_intesect_range

[<ankita@nvidia.com>]

From: Ankit Agrawal <ankita@nvidia.com>

range_intesect_range determines an overlap between two ranges. If an
overlap, the helper function returns the overlapping offset and size.

The VFIO PCI variant driver emulates the PCI config space BAR offset
registers. These offset may be accessed for read/write with a variety
of lengths including sub-word sizes from sub-word offsets. The driver
makes use of this helper function to read/write the targeted part of
the emulated register.

Make this a vfio_pci_core function, rename and export as GPL. Also
update references in virtio driver.

Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
---
 drivers/vfio/pci/vfio_pci_config.c | 45 +++++++++++++++++++
 drivers/vfio/pci/virtio/main.c     | 72 +++++++++++-------------------
 include/linux/vfio_pci_core.h      |  5 +++
 3 files changed, 76 insertions(+), 46 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 672a1804af6a..4fc3c605af13 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1966,3 +1966,48 @@ ssize_t vfio_pci_config_rw(struct vfio_pci_core_device *vdev, char __user *buf,
 
 	return done;
 }
+
+/**
+ * vfio_pci_core_range_intersect_range() - Determine overlap between a buffer
+ *					   and register offset ranges.
+ * @range1_start:    start offset of the buffer
+ * @count1:	     number of buffer bytes.
+ * @range2_start:    start register offset
+ * @count2:	     number of bytes of register
+ * @start_offset:    start offset of overlap start in the buffer
+ * @intersect_count: number of overlapping bytes
+ * @register_offset: start offset of overlap start in register
+ *
+ * The function determines an overlap between a register and a buffer.
+ * range1 represents the buffer and range2 represents register.
+ *
+ * Returns: true if there is overlap, false if not.
+ * The overlap start and range is returned through function args.
+ */
+bool vfio_pci_core_range_intersect_range(loff_t range1_start, size_t count1,
+					 loff_t range2_start, size_t count2,
+					 loff_t *start_offset,
+					 size_t *intersect_count,
+					 size_t *register_offset)
+{
+	if (range1_start <= range2_start &&
+	    range1_start + count1 > range2_start) {
+		*start_offset = range2_start - range1_start;
+		*intersect_count = min_t(size_t, count2,
+					 range1_start + count1 - range2_start);
+		*register_offset = 0;
+		return true;
+	}
+
+	if (range1_start > range2_start &&
+	    range1_start < range2_start + count2) {
+		*start_offset = 0;
+		*intersect_count = min_t(size_t, count1,
+					 range2_start + count2 - range1_start);
+		*register_offset = range1_start - range2_start;
+		return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(vfio_pci_core_range_intersect_range);
diff --git a/drivers/vfio/pci/virtio/main.c b/drivers/vfio/pci/virtio/main.c
index d5af683837d3..b5d3a8c5bbc9 100644
--- a/drivers/vfio/pci/virtio/main.c
+++ b/drivers/vfio/pci/virtio/main.c
@@ -132,33 +132,6 @@ virtiovf_pci_bar0_rw(struct virtiovf_pci_core_device *virtvdev,
 	return ret ? ret : count;
 }
 
-static bool range_intersect_range(loff_t range1_start, size_t count1,
-				  loff_t range2_start, size_t count2,
-				  loff_t *start_offset,
-				  size_t *intersect_count,
-				  size_t *register_offset)
-{
-	if (range1_start <= range2_start &&
-	    range1_start + count1 > range2_start) {
-		*start_offset = range2_start - range1_start;
-		*intersect_count = min_t(size_t, count2,
-					 range1_start + count1 - range2_start);
-		*register_offset = 0;
-		return true;
-	}
-
-	if (range1_start > range2_start &&
-	    range1_start < range2_start + count2) {
-		*start_offset = 0;
-		*intersect_count = min_t(size_t, count1,
-					 range2_start + count2 - range1_start);
-		*register_offset = range1_start - range2_start;
-		return true;
-	}
-
-	return false;
-}
-
 static ssize_t virtiovf_pci_read_config(struct vfio_device *core_vdev,
 					char __user *buf, size_t count,
 					loff_t *ppos)
@@ -178,16 +151,18 @@ static ssize_t virtiovf_pci_read_config(struct vfio_device *core_vdev,
 	if (ret < 0)
 		return ret;
 
-	if (range_intersect_range(pos, count, PCI_DEVICE_ID, sizeof(val16),
-				  &copy_offset, &copy_count, &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_DEVICE_ID,
+						sizeof(val16), &copy_offset,
+						&copy_count, &register_offset)) {
 		val16 = cpu_to_le16(VIRTIO_TRANS_ID_NET);
 		if (copy_to_user(buf + copy_offset, (void *)&val16 + register_offset, copy_count))
 			return -EFAULT;
 	}
 
 	if ((le16_to_cpu(virtvdev->pci_cmd) & PCI_COMMAND_IO) &&
-	    range_intersect_range(pos, count, PCI_COMMAND, sizeof(val16),
-				  &copy_offset, &copy_count, &register_offset)) {
+	    vfio_pci_core_range_intersect_range(pos, count, PCI_COMMAND,
+						sizeof(val16), &copy_offset,
+						&copy_count, &register_offset)) {
 		if (copy_from_user((void *)&val16 + register_offset, buf + copy_offset,
 				   copy_count))
 			return -EFAULT;
@@ -197,16 +172,18 @@ static ssize_t virtiovf_pci_read_config(struct vfio_device *core_vdev,
 			return -EFAULT;
 	}
 
-	if (range_intersect_range(pos, count, PCI_REVISION_ID, sizeof(val8),
-				  &copy_offset, &copy_count, &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_REVISION_ID,
+						sizeof(val8), &copy_offset,
+						&copy_count, &register_offset)) {
 		/* Transional needs to have revision 0 */
 		val8 = 0;
 		if (copy_to_user(buf + copy_offset, &val8, copy_count))
 			return -EFAULT;
 	}
 
-	if (range_intersect_range(pos, count, PCI_BASE_ADDRESS_0, sizeof(val32),
-				  &copy_offset, &copy_count, &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_BASE_ADDRESS_0,
+						sizeof(val32), &copy_offset,
+						&copy_count, &register_offset)) {
 		u32 bar_mask = ~(virtvdev->bar0_virtual_buf_size - 1);
 		u32 pci_base_addr_0 = le32_to_cpu(virtvdev->pci_base_addr_0);
 
@@ -215,8 +192,9 @@ static ssize_t virtiovf_pci_read_config(struct vfio_device *core_vdev,
 			return -EFAULT;
 	}
 
-	if (range_intersect_range(pos, count, PCI_SUBSYSTEM_ID, sizeof(val16),
-				  &copy_offset, &copy_count, &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_SUBSYSTEM_ID,
+						sizeof(val16), &copy_offset,
+						&copy_count, &register_offset)) {
 		/*
 		 * Transitional devices use the PCI subsystem device id as
 		 * virtio device id, same as legacy driver always did.
@@ -227,8 +205,9 @@ static ssize_t virtiovf_pci_read_config(struct vfio_device *core_vdev,
 			return -EFAULT;
 	}
 
-	if (range_intersect_range(pos, count, PCI_SUBSYSTEM_VENDOR_ID, sizeof(val16),
-				  &copy_offset, &copy_count, &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_SUBSYSTEM_VENDOR_ID,
+						sizeof(val16), &copy_offset,
+						&copy_count, &register_offset)) {
 		val16 = cpu_to_le16(PCI_VENDOR_ID_REDHAT_QUMRANET);
 		if (copy_to_user(buf + copy_offset, (void *)&val16 + register_offset,
 				 copy_count))
@@ -270,19 +249,20 @@ static ssize_t virtiovf_pci_write_config(struct vfio_device *core_vdev,
 	loff_t copy_offset;
 	size_t copy_count;
 
-	if (range_intersect_range(pos, count, PCI_COMMAND, sizeof(virtvdev->pci_cmd),
-				  &copy_offset, &copy_count,
-				  &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_COMMAND,
+						sizeof(virtvdev->pci_cmd),
+						&copy_offset, &copy_count,
+						&register_offset)) {
 		if (copy_from_user((void *)&virtvdev->pci_cmd + register_offset,
 				   buf + copy_offset,
 				   copy_count))
 			return -EFAULT;
 	}
 
-	if (range_intersect_range(pos, count, PCI_BASE_ADDRESS_0,
-				  sizeof(virtvdev->pci_base_addr_0),
-				  &copy_offset, &copy_count,
-				  &register_offset)) {
+	if (vfio_pci_core_range_intersect_range(pos, count, PCI_BASE_ADDRESS_0,
+						sizeof(virtvdev->pci_base_addr_0),
+						&copy_offset, &copy_count,
+						&register_offset)) {
 		if (copy_from_user((void *)&virtvdev->pci_base_addr_0 + register_offset,
 				   buf + copy_offset,
 				   copy_count))
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h
index cf9480a31f3e..1a056b5ef417 100644
--- a/include/linux/vfio_pci_core.h
+++ b/include/linux/vfio_pci_core.h
@@ -134,6 +134,11 @@ 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);
+bool vfio_pci_core_range_intersect_range(loff_t range1_start, size_t count1,
+					 loff_t range2_start, size_t count2,
+					 loff_t *start_offset,
+					 size_t *intersect_count,
+					 size_t *register_offset);
 #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