/*-
* BSD LICENSE
*
- * Copyright(c) 2016 NXP
- * All rights reserved.
+ * Copyright 2016 NXP
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
/** Double linked list of buses */
TAILQ_HEAD(rte_bus_list, rte_bus);
+
+/**
+ * IOVA mapping mode.
+ *
+ * IOVA mapping mode is iommu programming mode of a device.
+ * That device (for example: IOMMU backed DMA device) based
+ * on rte_iova_mode will generate physical or virtual address.
+ *
+ */
+enum rte_iova_mode {
+ RTE_IOVA_DC = 0, /* Don't care mode */
+ RTE_IOVA_PA = (1 << 0), /* DMA using physical address */
+ RTE_IOVA_VA = (1 << 1) /* DMA using virtual address */
+};
+
/**
* Bus specific scan for devices attached on the bus.
* For each bus object, the scan would be responsible for finding devices and
* @param dev
* Device pointer that was returned by a previous call to find_device.
*
- * @param devargs
- * Device declaration.
- *
* @return
* 0 on success.
* !0 on error.
*/
-typedef int (*rte_bus_plug_t)(struct rte_device *dev,
- const char *devargs);
+typedef int (*rte_bus_plug_t)(struct rte_device *dev);
/**
* Implementation specific remove function which is responsible for unlinking
enum rte_bus_scan_mode scan_mode; /**< Scan policy. */
};
+
+/**
+ * Get common iommu class of the all the devices on the bus. The bus may
+ * check that those devices are attached to iommu driver.
+ * If no devices are attached to the bus. The bus may return with don't care
+ * (_DC) value.
+ * Otherwise, The bus will return appropriate _pa or _va iova mode.
+ *
+ * @return
+ * enum rte_iova_mode value.
+ */
+typedef enum rte_iova_mode (*rte_bus_get_iommu_class_t)(void);
+
+
/**
* A structure describing a generic bus.
*/
rte_bus_unplug_t unplug; /**< Remove single device from driver */
rte_bus_parse_t parse; /**< Parse a device name */
struct rte_bus_conf conf; /**< Bus configuration */
+ rte_bus_get_iommu_class_t get_iommu_class; /**< Get iommu class */
+ rte_dev_iterate_t dev_iterate; /**< Device iterator. */
};
/**
*/
struct rte_bus *rte_bus_find_by_name(const char *busname);
+
+/**
+ * Get the common iommu class of devices bound on to buses available in the
+ * system. The default mode is PA.
+ *
+ * @return
+ * enum rte_iova_mode value.
+ */
+enum rte_iova_mode rte_bus_get_iommu_class(void);
+
/**
* Helper for Bus registration.
* The constructor has higher priority than PMD constructors.
*/
#define RTE_REGISTER_BUS(nm, bus) \
-RTE_INIT_PRIO(businitfn_ ##nm, 101); \
-static void businitfn_ ##nm(void) \
+RTE_INIT_PRIO(businitfn_ ##nm, BUS) \
{\
(bus).name = RTE_STR(nm);\
rte_bus_register(&bus); \