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cam: add xpt_path_sim_device to return device_t associated with a path

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Return the device associated with the sim's bus when it called
xpt_bus_register, if any. Most real SIMs in the tree set this device,
but some virtual ones do not have a device_t assocaited with them.

Reviewed by:		scottl@, mav@ (earlier version)
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D30853
This commit is contained in:
Warner Losh 2021-06-28 15:57:51 -06:00
parent 9f1e411ae8
commit 1ed4016267
2 changed files with 18 additions and 1 deletions
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18
sys/cam/cam_xpt.c
View File

@ -5574,7 +5574,23 @@ camisr_runqueue(void)
}
}
struct kv
/**
* @brief Return the device_t associated with the path
*
* When a SIM is created, it registers a bus with a NEWBUS device_t. This is
* stored in the internal cam_eb bus structure. There is no guarnatee any given
* path will have a @c device_t associated with it (it's legal to call @c
* xpt_bus_register with a @c NULL @c device_t.
*
* @param path Path to return the device_t for.
*/
device_t
xpt_path_sim_device(const struct cam_path *path)
{
return (path->bus->parent_dev);
}
struct kv
{
uint32_t v;
const char *name;

1
sys/cam/cam_xpt.h
View File

@ -113,6 +113,7 @@ target_id_t xpt_path_target_id(struct cam_path *path);
lun_id_t xpt_path_lun_id(struct cam_path *path);
struct cam_sim *xpt_path_sim(struct cam_path *path);
struct cam_periph *xpt_path_periph(struct cam_path *path);
device_t xpt_path_sim_device(const struct cam_path *path);
void xpt_print_path(struct cam_path *path);
void xpt_print_device(struct cam_ed *device);
void xpt_print(struct cam_path *path, const char *fmt, ...);