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bus: introduce device plug/unplug

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This allows the buses to plug and probe specific devices.
This is meant to be a building block for hotplug support.

Signed-off-by: Jan Blunck <jblunck@infradead.org>
This commit is contained in:
Jan Blunck 2017-06-30 20:19:38 +02:00 committed by Thomas Monjalon
parent 2f517390e5
commit 7c8810f43f
2 changed files with 34 additions and 0 deletions
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2
lib/librte_eal/common/eal_common_bus.c
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@ -51,6 +51,8 @@ rte_bus_register(struct rte_bus *bus)
RTE_VERIFY(bus->scan);
RTE_VERIFY(bus->probe);
RTE_VERIFY(bus->find_device);
/* Buses supporting driver plug also require unplug. */
RTE_VERIFY(!bus->plug || bus->unplug);
TAILQ_INSERT_TAIL(&rte_bus_list, bus, next);
RTE_LOG(DEBUG, EAL, "Registered [%s] bus.\n", bus->name);

32
lib/librte_eal/common/include/rte_bus.h
View File

@ -107,6 +107,36 @@ typedef struct rte_device *
(*rte_bus_find_device_t)(const struct rte_device *start, rte_dev_cmp_t cmp,
const void *data);
/**
* Implementation specific probe function which is responsible for linking
* devices on that bus with applicable drivers.
*
* @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);
/**
* Implementation specific remove function which is responsible for unlinking
* devices on that bus from assigned driver.
*
* @param dev
* Device pointer that was returned by a previous call to find_device.
*
* @return
* 0 on success.
* !0 on error.
*/
typedef int (*rte_bus_unplug_t)(struct rte_device *dev);
/**
* A structure describing a generic bus.
*/
@ -116,6 +146,8 @@ struct rte_bus {
rte_bus_scan_t scan; /**< Scan for devices attached to bus */
rte_bus_probe_t probe; /**< Probe devices on bus */
rte_bus_find_device_t find_device; /**< Find a device on the bus */
rte_bus_plug_t plug; /**< Probe single device for drivers */
rte_bus_unplug_t unplug; /**< Remove single device from driver */
};
/**