MFp4: Large set of CAM inprovements.

- Unify bus reset/probe sequence. Whenever bus attached at boot or later,
CAM will automatically reset and scan it. It allows to remove duplicate
code from many drivers.
- Any bus, attached before CAM completed it's boot-time initialization,
will equally join to the process, delaying boot if needed.
- New kern.cam.boot_delay loader tunable should help controllers that
are still unable to register their buses in time (such as slow USB/
PCCard/ CardBus devices), by adding one more event to wait on boot.
- To allow synchronization between different CAM levels, concept of
requests priorities was extended. Priorities now split between several
"run levels". Device can be freezed at specified level, allowing higher
priority requests to pass. For example, no payload requests allowed,
until PMP driver enable port. ATA XPT negotiate transfer parameters,
periph driver configure caching and so on.
- Frozen requests are no more counted by request allocation scheduler.
It fixes deadlocks, when frozen low priority payload requests occupying
slots, required by higher levels to manage theit execution.
- Two last changes were holding proper ATA reinitialization and error
recovery implementation. Now it is done: SATA controllers and Port
Multipliers now implement automatic hot-plug and should correctly
recover from timeouts and bus resets.
- Improve SCSI error recovery for devices on buses without automatic sense
reporting, such as ATAPI or USB. For example, it allows CAM to wait, while
CD drive loads disk, instead of immediately return error status.
- Decapitalize diagnostic messages and make them more readable and sensible.
- Teach PMP driver to limit maximum speed on fan-out ports.
- Make boot wait for PMP scan completes, and make rescan more reliable.
- Fix pass driver, to return CCB to user level in case of error.
- Increase number of retries in cd driver, as device may return several UAs.

1 files changed, 5 insertions, 1 deletions

diff --git a/sys/cam/cam_periph.h b/sys/cam/cam_periph.h
index e207b19..33e9f75 100644
--- a/sys/cam/cam_periph.h
+++ b/sys/cam/cam_periph.h
@@ -42,6 +42,7 @@ extern struct cam_periph *xpt_periph;
 
 extern struct periph_driver **periph_drivers;
 void periphdriver_register(void *);
+void periphdriver_init(int level);
 
 #include <sys/module.h>
 #define PERIPHDRIVER_DECLARE(name, driver) \
@@ -117,6 +118,7 @@ struct cam_periph {
 #define CAM_PERIPH_INVALID		0x08
 #define CAM_PERIPH_NEW_DEV_FOUND	0x10
 #define CAM_PERIPH_RECOVERY_INPROG	0x20
+#define CAM_PERIPH_SENSE_INPROG		0x40
 	u_int32_t		 immediate_priority;
 	u_int32_t		 refcount;
 	SLIST_HEAD(, ccb_hdr)	 ccb_list;	/* For "immediate" requests */
@@ -165,8 +167,10 @@ int		cam_periph_ioctl(struct cam_periph *periph, u_long cmd,
 						      cam_flags camflags,
 						      u_int32_t sense_flags));
 void		cam_freeze_devq(struct cam_path *path);
+void		cam_freeze_devq_arg(struct cam_path *path, u_int32_t flags,
+		    uint32_t arg);
 u_int32_t	cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
-				 u_int32_t opening_reduction, u_int32_t timeout,
+				 u_int32_t opening_reduction, u_int32_t arg,
 				 int getcount_only);
 void		cam_periph_async(struct cam_periph *periph, u_int32_t code,
 		 		 struct cam_path *path, void *arg);