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40 * DPDK device bus interface
42 * This file exposes API and interfaces for bus abstraction
43 * over the devices and drivers in EAL.
51 #include <sys/queue.h>
56 /** Double linked list of buses */
57 TAILQ_HEAD(rte_bus_list, rte_bus);
60 * Bus specific scan for devices attached on the bus.
61 * For each bus object, the scan would be responsible for finding devices and
62 * adding them to its private device list.
64 * A bus should mandatorily implement this method.
67 * 0 for successful scan
68 * <0 for unsuccessful scan with error value
70 typedef int (*rte_bus_scan_t)(void);
73 * Implementation specific probe function which is responsible for linking
74 * devices on that bus with applicable drivers.
76 * This is called while iterating over each registered bus.
79 * 0 for successful probe
80 * !0 for any error while probing
82 typedef int (*rte_bus_probe_t)(void);
85 * A structure describing a generic bus.
88 TAILQ_ENTRY(rte_bus) next; /**< Next bus object in linked list */
89 const char *name; /**< Name of the bus */
90 rte_bus_scan_t scan; /**< Scan for devices attached to bus */
91 rte_bus_probe_t probe; /**< Probe devices on bus */
95 * Register a Bus handler.
98 * A pointer to a rte_bus structure describing the bus
101 void rte_bus_register(struct rte_bus *bus);
104 * Unregister a Bus handler.
107 * A pointer to a rte_bus structure describing the bus
108 * to be unregistered.
110 void rte_bus_unregister(struct rte_bus *bus);
113 * Scan all the buses.
116 * 0 in case of success in scanning all buses
117 * !0 in case of failure to scan
119 int rte_bus_scan(void);
122 * For each device on the buses, perform a driver 'match' and call the
123 * driver-specific probe for device initialization.
126 * 0 for successful match/probe
129 int rte_bus_probe(void);
132 * Dump information of all the buses registered with EAL.
135 * A valid and open output stream handle
138 * 0 in case of success
139 * !0 in case there is error in opening the output stream
141 void rte_bus_dump(FILE *f);
144 * Bus comparison function.
150 * Data to compare against.
153 * 0 if the bus matches the data.
154 * !0 if the bus does not match.
155 * <0 if ordering is possible and the bus is lower than the data.
156 * >0 if ordering is possible and the bus is greater than the data.
158 typedef int (*rte_bus_cmp_t)(const struct rte_bus *bus, const void *data);
161 * Bus iterator to find a particular bus.
163 * This function compares each registered bus to find one that matches
164 * the data passed as parameter.
166 * If the comparison function returns zero this function will stop iterating
167 * over any more buses. To continue a search the bus of a previous search can
168 * be passed via the start parameter.
171 * Starting point for the iteration.
174 * Comparison function.
177 * Data to pass to comparison function.
180 * A pointer to a rte_bus structure or NULL in case no bus matches
182 struct rte_bus *rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
186 * Helper for Bus registration.
187 * The constructor has higher priority than PMD constructors.
189 #define RTE_REGISTER_BUS(nm, bus) \
190 static void __attribute__((constructor(101), used)) businitfn_ ##nm(void) \
192 (bus).name = RTE_STR(nm);\
193 rte_bus_register(&bus); \
200 #endif /* _RTE_BUS_H */