[PATCH v6 6/8] virtio: add vfio api to rd/wr ioport space

[Santosh Shukla <sshukla@mvista.com>]

For vfio case - Use pread/pwrite api to access virtio
ioport space.

Signed-off-by: Santosh Shukla <sshukla@mvista.com>
Signed-off-by: Rizwan Ansari <ransari@mvista.com>
Signed-off-by: Rakesh Krishnamurthy <rakeshk@mvista.com>
---
v5-->v6:
- renamed inport_in/out to vfio_in/out
- Renamed file from virtio_vfio_rw.h to virtio_vfio_io.h

 drivers/net/virtio/virtio_vfio_io.h |  104 +++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 drivers/net/virtio/virtio_vfio_io.h

diff --git a/drivers/net/virtio/virtio_vfio_io.h b/drivers/net/virtio/virtio_vfio_io.h
new file mode 100644
index 0000000..218d4ed
--- /dev/null
+++ b/drivers/net/virtio/virtio_vfio_io.h
@@ -0,0 +1,104 @@
+/*
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Cavium Networks. All rights reserved.
+ *   All rights reserved.
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in
+ *     the documentation and/or other materials provided with the
+ *     distribution.
+ *   * Neither the name of Intel Corporation nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ *    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ *    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ *    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ *    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ *    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ *    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ *    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ *    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ *    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+#ifndef _VIRTIO_VFIO_IO_H_
+#define _VIRTIO_VFIO_IO_H_
+
+#include "virtio_logs.h"
+#if defined(RTE_EAL_VFIO) && defined(RTE_LIBRTE_EAL_LINUXAPP)
+
+#include <stdint.h>
+#include <rte_pci.h>
+
+/* vfio rd/rw virtio apis */
+static inline void
+vfio_inb(const struct rte_pci_device *pci_dev, uint8_t reg, uint8_t *val)
+{
+	if (rte_eal_pci_read_bar(pci_dev, val, sizeof(uint8_t), reg, 0) <= 0) {
+		PMD_DRV_LOG(ERR, "Can't read from PCI bar space");
+		return;
+	}
+}
+
+static inline void
+vfio_inw(const struct rte_pci_device *pci_dev, uint16_t reg, uint16_t *val)
+{
+	if (rte_eal_pci_read_bar(pci_dev, val, sizeof(uint16_t), reg, 0) <= 0) {
+		PMD_DRV_LOG(ERR, "Can't read from PCI bar space");
+		return;
+	}
+}
+
+static inline void
+vfio_inl(const struct rte_pci_device *pci_dev, uint32_t reg, uint32_t *val)
+{
+	if (rte_eal_pci_read_bar(pci_dev, val, sizeof(uint32_t), reg, 0) <= 0) {
+		PMD_DRV_LOG(ERR, "Can't read from PCI bar space");
+		return;
+	}
+}
+
+static inline void
+vfio_outb_p(const struct rte_pci_device *pci_dev, uint8_t reg, uint8_t val)
+{
+	if (rte_eal_pci_write_bar(pci_dev, &val, sizeof(uint8_t),
+				  reg, 0) <= 0) {
+		PMD_DRV_LOG(ERR, "Can't write to PCI bar space");
+		return;
+	}
+}
+
+
+static inline void
+vfio_outw_p(const struct rte_pci_device *pci_dev, uint16_t reg, uint16_t val)
+{
+	if (rte_eal_pci_write_bar(pci_dev, &val, sizeof(uint16_t),
+				  reg, 0) <= 0) {
+		PMD_DRV_LOG(ERR, "Can't write to PCI bar space");
+		return;
+	}
+}
+
+
+static inline void
+vfio_outl_p(const struct rte_pci_device *pci_dev, uint32_t reg, uint32_t val)
+{
+	if (rte_eal_pci_write_bar(pci_dev, &val, sizeof(uint32_t),
+				  reg, 0) <= 0) {
+		PMD_DRV_LOG(ERR, "Can't write to PCI bar space");
+		return;
+	}
+}
+
+#endif /* RTE_EAL_VFIO && RTE_XX_EAL_LINUXAPP */
+#endif /* _VIRTIO_VFIO_RW_H_ */
-- 
1.7.9.5