[dpdk-dev] [PATCH v5 07/11] virtio: pci: extend virtio pci rw api for vfio interface

[Santosh Shukla <sshukla@mvista.com>]

So far virtio handle rw access for uio / ioport interface, This patch to extend
the support for vfio interface.

Applicable for virtio 0.95 spec.

Signed-off-by: Santosh Shukla <sshukla@mvista.com>
---
v4--> v5:
- Replaced virtio_rd/wr_1/2/4() macro implementation with inline function, per
  Yuan review commment.

 drivers/net/virtio/virtio_pci.c |  110 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 97 insertions(+), 13 deletions(-)

diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index a9f179f..0c29f1d 100644
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -40,6 +40,7 @@
 #include "virtio_pci.h"
 #include "virtio_logs.h"
 #include "virtqueue.h"
+#include "virtio_vfio_rw.h"
 
 /*
  * Following macros are derieved from linux/pci_regs.h, however,
@@ -49,24 +50,107 @@
 #define PCI_CAPABILITY_LIST	0x34
 #define PCI_CAP_ID_VNDR		0x09
 
-
 #define VIRTIO_PCI_REG_ADDR(hw, reg) \
 	(unsigned short)((hw)->io_base + (reg))
 
-#define VIRTIO_READ_REG_1(hw, reg) \
-	inb((VIRTIO_PCI_REG_ADDR((hw), (reg))))
-#define VIRTIO_WRITE_REG_1(hw, reg, value) \
-	outb_p((unsigned char)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+static inline uint8_t
+virtio_read_reg_1(struct virtio_hw *hw, uint64_t reg_offset)
+{
+	uint8_t ret;
+	struct rte_pci_device *dev;
+
+	dev = hw->dev;
+	if (dev->kdrv == RTE_KDRV_VFIO)
+		ioport_inb(dev, reg_offset, &ret);
+	else
+		ret = inb(VIRTIO_PCI_REG_ADDR(hw, reg_offset));
+
+	return ret;
+}
+
+static inline uint16_t
+virtio_read_reg_2(struct virtio_hw *hw, uint64_t reg_offset)
+{
+	uint16_t ret;
+	struct rte_pci_device *dev;
+
+	dev = hw->dev;
+	if (dev->kdrv == RTE_KDRV_VFIO)
+		ioport_inw(dev, reg_offset, &ret);
+	else
+		ret = inw(VIRTIO_PCI_REG_ADDR(hw, reg_offset));
+
+	return ret;
+}
+
+static inline uint32_t
+virtio_read_reg_4(struct virtio_hw *hw, uint64_t reg_offset)
+{
+	uint32_t ret;
+	struct rte_pci_device *dev;
+
+	dev = hw->dev;
+	if (dev->kdrv == RTE_KDRV_VFIO)
+		ioport_inl(dev, reg_offset, &ret);
+	else
+		ret = inl(VIRTIO_PCI_REG_ADDR(hw, reg_offset));
+
+	return ret;
+}
+
+static inline void
+virtio_write_reg_1(struct virtio_hw *hw, uint64_t reg_offset, uint8_t value)
+{
+	struct rte_pci_device *dev;
+
+	dev = hw->dev;
+	if (dev->kdrv == RTE_KDRV_VFIO)
+		ioport_outb_p(dev, reg_offset, value);
+	else
+		outb_p((unsigned char)value,
+		       VIRTIO_PCI_REG_ADDR(hw, reg_offset));
+}
+
+static inline void
+virtio_write_reg_2(struct virtio_hw *hw, uint64_t reg_offset, uint16_t value)
+{
+	struct rte_pci_device *dev;
+
+	dev = hw->dev;
+	if (dev->kdrv == RTE_KDRV_VFIO)
+		ioport_outw_p(dev, reg_offset, value);
+	else
+		outw_p((unsigned short)value,
+		       VIRTIO_PCI_REG_ADDR(hw, reg_offset));
+}
+
+static inline void
+virtio_write_reg_4(struct virtio_hw *hw, uint64_t reg_offset, uint32_t value)
+{
+	struct rte_pci_device *dev;
+
+	dev = hw->dev;
+	if (dev->kdrv == RTE_KDRV_VFIO)
+		ioport_outl_p(dev, reg_offset, value);
+	else
+		outl_p((unsigned int)value,
+		       VIRTIO_PCI_REG_ADDR(hw, reg_offset));
+}
+
+#define VIRTIO_READ_REG_1(hw, reg)					\
+	virtio_read_reg_1((hw), (reg))
+#define VIRTIO_WRITE_REG_1(hw, reg, value)				\
+	virtio_write_reg_1((hw), (reg), (value))
 
-#define VIRTIO_READ_REG_2(hw, reg) \
-	inw((VIRTIO_PCI_REG_ADDR((hw), (reg))))
-#define VIRTIO_WRITE_REG_2(hw, reg, value) \
-	outw_p((unsigned short)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_READ_REG_2(hw, reg)					\
+	virtio_read_reg_2((hw), (reg))
+#define VIRTIO_WRITE_REG_2(hw, reg, value)				\
+	virtio_write_reg_2((hw), (reg), (value))
 
-#define VIRTIO_READ_REG_4(hw, reg) \
-	inl((VIRTIO_PCI_REG_ADDR((hw), (reg))))
-#define VIRTIO_WRITE_REG_4(hw, reg, value) \
-	outl_p((unsigned int)(value), (VIRTIO_PCI_REG_ADDR((hw), (reg))))
+#define VIRTIO_READ_REG_4(hw, reg)					\
+	virtio_read_reg_4((hw), (reg))
+#define VIRTIO_WRITE_REG_4(hw, reg, value)				\
+	virtio_write_reg_4((hw), (reg), (value))
 
 static void
 legacy_read_dev_config(struct virtio_hw *hw, uint64_t offset,
-- 
1.7.9.5