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A Xen PV frontend communicates its state to the PV backend by writing to the 'state' key in the frontend area in xenstore. It is therefore necessary for a XenDevice implementation to be notified whenever the value of this key changes. This patch adds code to do this as follows: - an 'fd handler' is registered on the libxenstore handle which will be triggered whenever a 'watch' event occurs - primitives are added to xen-bus-helper to add or remove watch events - a list of Notifier objects is added to XenBus to provide a mechanism to call the appropriate 'watch handler' when its associated event occurs The xen-block implementation is extended with a 'frontend_changed' method, which calls as-yet stub 'connect' and 'disconnect' functions when the relevant frontend state transitions occur. A subsequent patch will supply a full implementation for these functions. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Anthony Perard <anthony.perard@citrix.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
35 lines
1.9 KiB
Plaintext
35 lines
1.9 KiB
Plaintext
# See docs/devel/tracing.txt for syntax documentation.
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# include/hw/xen/xen_common.h
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xen_default_ioreq_server(void) ""
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xen_ioreq_server_create(uint32_t id) "id: %u"
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xen_ioreq_server_destroy(uint32_t id) "id: %u"
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xen_ioreq_server_state(uint32_t id, bool enable) "id: %u: enable: %i"
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xen_map_mmio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: 0x%"PRIx64" end: 0x%"PRIx64
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xen_unmap_mmio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: 0x%"PRIx64" end: 0x%"PRIx64
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xen_map_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: 0x%"PRIx64" end: 0x%"PRIx64
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xen_unmap_portio_range(uint32_t id, uint64_t start_addr, uint64_t end_addr) "id: %u start: 0x%"PRIx64" end: 0x%"PRIx64
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xen_map_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x"
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xen_unmap_pcidev(uint32_t id, uint8_t bus, uint8_t dev, uint8_t func) "id: %u bdf: %02x.%02x.%02x"
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xen_domid_restrict(int err) "err: %u"
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# include/hw/xen/xen-bus.c
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xen_bus_realize(void) ""
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xen_bus_unrealize(void) ""
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xen_bus_add_watch(const char *node, const char *key, char *token) "node: %s key: %s token: %s"
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xen_bus_remove_watch(const char *node, const char *key, char *token) "node: %s key: %s token: %s"
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xen_bus_watch(const char *token) "token: %s"
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xen_device_realize(const char *type, char *name) "type: %s name: %s"
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xen_device_unrealize(const char *type, char *name) "type: %s name: %s"
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xen_device_backend_state(const char *type, char *name, const char *state) "type: %s name: %s -> %s"
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xen_device_frontend_state(const char *type, char *name, const char *state) "type: %s name: %s -> %s"
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xen_device_frontend_changed(const char *type, char *name) "type: %s name: %s"
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# include/hw/xen/xen-bus-helper.c
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xs_node_create(const char *node) "%s"
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xs_node_destroy(const char *node) "%s"
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xs_node_vprintf(char *path, char *value) "%s %s"
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xs_node_vscanf(char *path, char *value) "%s %s"
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xs_node_watch(char *path) "%s"
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xs_node_unwatch(char *path) "%s"
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