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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 * Device iterator to find a device on a bus.
87 * This function returns an rte_device if one of those held by the bus
88 * matches the data passed as parameter.
90 * If the comparison function returns zero this function should stop iterating
91 * over any more devices. To continue a search the device of a previous search
92 * can be passed via the start parameter.
95 * Comparison function.
98 * Data to compare each device against.
101 * starting point for the iteration
104 * The first device matching the data, NULL if none exists.
106 typedef struct rte_device *
107 (*rte_bus_find_device_t)(const struct rte_device *start, rte_dev_cmp_t cmp,
111 * Implementation specific probe function which is responsible for linking
112 * devices on that bus with applicable drivers.
115 * Device pointer that was returned by a previous call to find_device.
118 * Device declaration.
124 typedef int (*rte_bus_plug_t)(struct rte_device *dev,
125 const char *devargs);
128 * Implementation specific remove function which is responsible for unlinking
129 * devices on that bus from assigned driver.
132 * Device pointer that was returned by a previous call to find_device.
138 typedef int (*rte_bus_unplug_t)(struct rte_device *dev);
141 * A structure describing a generic bus.
144 TAILQ_ENTRY(rte_bus) next; /**< Next bus object in linked list */
145 const char *name; /**< Name of the bus */
146 rte_bus_scan_t scan; /**< Scan for devices attached to bus */
147 rte_bus_probe_t probe; /**< Probe devices on bus */
148 rte_bus_find_device_t find_device; /**< Find a device on the bus */
149 rte_bus_plug_t plug; /**< Probe single device for drivers */
150 rte_bus_unplug_t unplug; /**< Remove single device from driver */
154 * Register a Bus handler.
157 * A pointer to a rte_bus structure describing the bus
160 void rte_bus_register(struct rte_bus *bus);
163 * Unregister a Bus handler.
166 * A pointer to a rte_bus structure describing the bus
167 * to be unregistered.
169 void rte_bus_unregister(struct rte_bus *bus);
172 * Scan all the buses.
175 * 0 in case of success in scanning all buses
176 * !0 in case of failure to scan
178 int rte_bus_scan(void);
181 * For each device on the buses, perform a driver 'match' and call the
182 * driver-specific probe for device initialization.
185 * 0 for successful match/probe
188 int rte_bus_probe(void);
191 * Dump information of all the buses registered with EAL.
194 * A valid and open output stream handle
197 * 0 in case of success
198 * !0 in case there is error in opening the output stream
200 void rte_bus_dump(FILE *f);
203 * Bus comparison function.
209 * Data to compare against.
212 * 0 if the bus matches the data.
213 * !0 if the bus does not match.
214 * <0 if ordering is possible and the bus is lower than the data.
215 * >0 if ordering is possible and the bus is greater than the data.
217 typedef int (*rte_bus_cmp_t)(const struct rte_bus *bus, const void *data);
220 * Bus iterator to find a particular bus.
222 * This function compares each registered bus to find one that matches
223 * the data passed as parameter.
225 * If the comparison function returns zero this function will stop iterating
226 * over any more buses. To continue a search the bus of a previous search can
227 * be passed via the start parameter.
230 * Starting point for the iteration.
233 * Comparison function.
236 * Data to pass to comparison function.
239 * A pointer to a rte_bus structure or NULL in case no bus matches
241 struct rte_bus *rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
245 * Find the registered bus for a particular device.
247 struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev);
250 * Find the registered bus for a given name.
252 struct rte_bus *rte_bus_find_by_name(const char *busname);
255 * Helper for Bus registration.
256 * The constructor has higher priority than PMD constructors.
258 #define RTE_REGISTER_BUS(nm, bus) \
259 RTE_INIT_PRIO(businitfn_ ##nm, 101); \
260 static void businitfn_ ##nm(void) \
262 (bus).name = RTE_STR(nm);\
263 rte_bus_register(&bus); \
270 #endif /* _RTE_BUS_H */