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39 * DPDK device bus interface
41 * This file exposes API and interfaces for bus abstraction
42 * over the devices and drivers in EAL.
50 #include <sys/queue.h>
55 /** Double linked list of buses */
56 TAILQ_HEAD(rte_bus_list, rte_bus);
62 * IOVA mapping mode is iommu programming mode of a device.
63 * That device (for example: IOMMU backed DMA device) based
64 * on rte_iova_mode will generate physical or virtual address.
68 RTE_IOVA_DC = 0, /* Don't care mode */
69 RTE_IOVA_PA = (1 << 0), /* DMA using physical address */
70 RTE_IOVA_VA = (1 << 1) /* DMA using virtual address */
74 * Bus specific scan for devices attached on the bus.
75 * For each bus object, the scan would be responsible for finding devices and
76 * adding them to its private device list.
78 * A bus should mandatorily implement this method.
81 * 0 for successful scan
82 * <0 for unsuccessful scan with error value
84 typedef int (*rte_bus_scan_t)(void);
87 * Implementation specific probe function which is responsible for linking
88 * devices on that bus with applicable drivers.
90 * This is called while iterating over each registered bus.
93 * 0 for successful probe
94 * !0 for any error while probing
96 typedef int (*rte_bus_probe_t)(void);
99 * Device iterator to find a device on a bus.
101 * This function returns an rte_device if one of those held by the bus
102 * matches the data passed as parameter.
104 * If the comparison function returns zero this function should stop iterating
105 * over any more devices. To continue a search the device of a previous search
106 * can be passed via the start parameter.
109 * Comparison function.
112 * Data to compare each device against.
115 * starting point for the iteration
118 * The first device matching the data, NULL if none exists.
120 typedef struct rte_device *
121 (*rte_bus_find_device_t)(const struct rte_device *start, rte_dev_cmp_t cmp,
125 * Implementation specific probe function which is responsible for linking
126 * devices on that bus with applicable drivers.
129 * Device pointer that was returned by a previous call to find_device.
135 typedef int (*rte_bus_plug_t)(struct rte_device *dev);
138 * Implementation specific remove function which is responsible for unlinking
139 * devices on that bus from assigned driver.
142 * Device pointer that was returned by a previous call to find_device.
148 typedef int (*rte_bus_unplug_t)(struct rte_device *dev);
151 * Bus specific parsing function.
152 * Validates the syntax used in the textual representation of a device,
153 * If the syntax is valid and ``addr`` is not NULL, writes the bus-specific
154 * device representation to ``addr``.
157 * device textual description
160 * device information location address, into which parsed info
161 * should be written. If NULL, nothing should be written, which
165 * 0 if parsing was successful.
168 typedef int (*rte_bus_parse_t)(const char *name, void *addr);
171 * Implement a specific hot-unplug handler, which is responsible for
172 * handle the failure when device be hot-unplugged. When the event of
173 * hot-unplug be detected, it could call this function to handle
174 * the hot-unplug failure and avoid app crash.
176 * Pointer of the device structure.
182 typedef int (*rte_bus_hot_unplug_handler_t)(struct rte_device *dev);
187 enum rte_bus_scan_mode {
188 RTE_BUS_SCAN_UNDEFINED,
189 RTE_BUS_SCAN_WHITELIST,
190 RTE_BUS_SCAN_BLACKLIST,
194 * A structure used to configure bus operations.
196 struct rte_bus_conf {
197 enum rte_bus_scan_mode scan_mode; /**< Scan policy. */
202 * Get common iommu class of the all the devices on the bus. The bus may
203 * check that those devices are attached to iommu driver.
204 * If no devices are attached to the bus. The bus may return with don't care
206 * Otherwise, The bus will return appropriate _pa or _va iova mode.
209 * enum rte_iova_mode value.
211 typedef enum rte_iova_mode (*rte_bus_get_iommu_class_t)(void);
215 * A structure describing a generic bus.
218 TAILQ_ENTRY(rte_bus) next; /**< Next bus object in linked list */
219 const char *name; /**< Name of the bus */
220 rte_bus_scan_t scan; /**< Scan for devices attached to bus */
221 rte_bus_probe_t probe; /**< Probe devices on bus */
222 rte_bus_find_device_t find_device; /**< Find a device on the bus */
223 rte_bus_plug_t plug; /**< Probe single device for drivers */
224 rte_bus_unplug_t unplug; /**< Remove single device from driver */
225 rte_bus_parse_t parse; /**< Parse a device name */
226 struct rte_bus_conf conf; /**< Bus configuration */
227 rte_bus_get_iommu_class_t get_iommu_class; /**< Get iommu class */
228 rte_dev_iterate_t dev_iterate; /**< Device iterator. */
229 rte_bus_hot_unplug_handler_t hot_unplug_handler;
230 /**< handle hot-unplug failure on the bus */
234 * Register a Bus handler.
237 * A pointer to a rte_bus structure describing the bus
240 void rte_bus_register(struct rte_bus *bus);
243 * Unregister a Bus handler.
246 * A pointer to a rte_bus structure describing the bus
247 * to be unregistered.
249 void rte_bus_unregister(struct rte_bus *bus);
252 * Scan all the buses.
255 * 0 in case of success in scanning all buses
256 * !0 in case of failure to scan
258 int rte_bus_scan(void);
261 * For each device on the buses, perform a driver 'match' and call the
262 * driver-specific probe for device initialization.
265 * 0 for successful match/probe
268 int rte_bus_probe(void);
271 * Dump information of all the buses registered with EAL.
274 * A valid and open output stream handle
276 void rte_bus_dump(FILE *f);
279 * Bus comparison function.
285 * Data to compare against.
288 * 0 if the bus matches the data.
289 * !0 if the bus does not match.
290 * <0 if ordering is possible and the bus is lower than the data.
291 * >0 if ordering is possible and the bus is greater than the data.
293 typedef int (*rte_bus_cmp_t)(const struct rte_bus *bus, const void *data);
296 * Bus iterator to find a particular bus.
298 * This function compares each registered bus to find one that matches
299 * the data passed as parameter.
301 * If the comparison function returns zero this function will stop iterating
302 * over any more buses. To continue a search the bus of a previous search can
303 * be passed via the start parameter.
306 * Starting point for the iteration.
309 * Comparison function.
312 * Data to pass to comparison function.
315 * A pointer to a rte_bus structure or NULL in case no bus matches
317 struct rte_bus *rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
321 * Find the registered bus for a particular device.
323 struct rte_bus *rte_bus_find_by_device(const struct rte_device *dev);
326 * Find the registered bus for a given name.
328 struct rte_bus *rte_bus_find_by_name(const char *busname);
332 * Get the common iommu class of devices bound on to buses available in the
333 * system. The default mode is PA.
336 * enum rte_iova_mode value.
338 enum rte_iova_mode rte_bus_get_iommu_class(void);
341 * Helper for Bus registration.
342 * The constructor has higher priority than PMD constructors.
344 #define RTE_REGISTER_BUS(nm, bus) \
345 RTE_INIT_PRIO(businitfn_ ##nm, BUS) \
347 (bus).name = RTE_STR(nm);\
348 rte_bus_register(&bus); \
355 #endif /* _RTE_BUS_H */