pci: export device mapping functions

Normally we could set RTE_PCI_DRV_NEED_MAPPING flag so that eal will
invoke pci_map_device internally for us. From that point view, there
is no need to export pci_map_device.

However, for virtio pmd driver, which is designed to work without
binding UIO (or something similar first), pci_map_device() will fail,
which ends up with virtio pmd driver being skipped. Therefore, we can
not set RTE_PCI_DRV_NEED_MAPPING blindly at virtio pmd driver.

Therefore, this patch exports pci_map_device, and let virtio pmd call
it when necessary.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Tested-by: Santosh Shukla <sshukla@mvista.com>
Tested-by: Qian Xu <qian.q.xu@intel.com>
Reviewed-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Tested-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Acked-by: David Marchand <david.marchand@6wind.com>
Acked-by: Huawei Xie <huawei.xie@intel.com>

lib/librte_eal/bsdapp/eal/eal_pci.c

@@ -93,7 +93,7 @@ pci_unbind_kernel_driver(struct rte_pci_device *dev __rte_unused)
 
 /* Map pci device */
 int
-pci_map_device(struct rte_pci_device *dev)
+rte_eal_pci_map_device(struct rte_pci_device *dev)
 {
 	int ret = -1;
 
@@ -115,7 +115,7 @@ pci_map_device(struct rte_pci_device *dev)
 
 /* Unmap pci device */
 void
-pci_unmap_device(struct rte_pci_device *dev)
+rte_eal_pci_unmap_device(struct rte_pci_device *dev)
 {
 	/* try unmapping the NIC resources */
 	switch (dev->kdrv) {

lib/librte_eal/bsdapp/eal/rte_eal_version.map

@@ -139,6 +139,8 @@ DPDK_2.2 {
 DPDK_2.3 {
 	global:
 
+	rte_eal_pci_map_device;
+	rte_eal_pci_unmap_device;
 	rte_cpu_feature_table;
 
 } DPDK_2.2;

lib/librte_eal/common/eal_common_pci.c

@@ -188,7 +188,7 @@ rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *d
 			pci_config_space_set(dev);
 #endif
 			/* map resources for devices that use igb_uio */
-			ret = pci_map_device(dev);
+			ret = rte_eal_pci_map_device(dev);
 			if (ret != 0)
 				return ret;
 		} else if (dr->drv_flags & RTE_PCI_DRV_FORCE_UNBIND &&
@@ -254,7 +254,7 @@ rte_eal_pci_detach_dev(struct rte_pci_driver *dr,
 
 		if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING)
 			/* unmap resources for devices that use igb_uio */
-			pci_unmap_device(dev);
+			rte_eal_pci_unmap_device(dev);
 
 		return 0;
 	}

lib/librte_eal/common/eal_private.h

@@ -164,24 +164,6 @@ struct rte_pci_device;
  */
 int pci_unbind_kernel_driver(struct rte_pci_device *dev);
 
-/**
- * Map this device
- *
- * This function is private to EAL.
- *
- * @return
- *   0 on success, negative on error and positive if no driver
- *   is found for the device.
- */
-int pci_map_device(struct rte_pci_device *dev);
-
-/**
- * Unmap this device
- *
- * This function is private to EAL.
- */
-void pci_unmap_device(struct rte_pci_device *dev);
-
 /**
  * Map the PCI resource of a PCI device in virtual memory
  *

lib/librte_eal/common/include/rte_pci.h

@@ -366,6 +366,32 @@ int rte_eal_pci_scan(void);
  */
 int rte_eal_pci_probe(void);
 
+/**
+ * Map the PCI device resources in user space virtual memory address
+ *
+ * Note that driver should not call this function when flag
+ * RTE_PCI_DRV_NEED_MAPPING is set, as EAL will do that for
+ * you when it's on.
+ *
+ * @param dev
+ *   A pointer to a rte_pci_device structure describing the device
+ *   to use
+ *
+ * @return
+ *   0 on success, negative on error and positive if no driver
+ *   is found for the device.
+ */
+int rte_eal_pci_map_device(struct rte_pci_device *dev);
+
+/**
+ * Unmap this device
+ *
+ * @param dev
+ *   A pointer to a rte_pci_device structure describing the device
+ *   to use
+ */
+void rte_eal_pci_unmap_device(struct rte_pci_device *dev);
+
 /**
  * @internal
  * Map a particular resource from a file.

lib/librte_eal/linuxapp/eal/eal_pci.c

@@ -124,7 +124,7 @@ pci_get_kernel_driver_by_path(const char *filename, char *dri_name)
 
 /* Map pci device */
 int
-pci_map_device(struct rte_pci_device *dev)
+rte_eal_pci_map_device(struct rte_pci_device *dev)
 {
 	int ret = -1;
 
@@ -153,7 +153,7 @@ pci_map_device(struct rte_pci_device *dev)
 
 /* Unmap pci device */
 void
-pci_unmap_device(struct rte_pci_device *dev)
+rte_eal_pci_unmap_device(struct rte_pci_device *dev)
 {
 	/* try unmapping the NIC resources using VFIO if it exists */
 	switch (dev->kdrv) {

lib/librte_eal/linuxapp/eal/rte_eal_version.map

@@ -142,5 +142,8 @@ DPDK_2.2 {
 DPDK_2.3 {
 	global:
 
+	rte_eal_pci_map_device;
+	rte_eal_pci_unmap_device;
 	rte_cpu_feature_table;
+
 } DPDK_2.2;