MFp4:
- Move tagged queueing control from ADA to ATA XPT. It allows to control
device command queue length correctly. First step to support < 32 tags.
- Limit queue for non-tagged devices by 2 slot

MFp4:
- Move tagged queueing control from ADA to ATA XPT. It allows to control
device command queue length correctly. First step to support < 32 tags.
- Limit queue for non-tagged devices by 2 slots for ahci(4) and siis(4).
- Implement quirk matching for ATA devices.
- Move xpt_schedule_dev_sendq() from header to source file.
- Move delayed queue shrinking to the more expected place - element freeing.
- Remove some SCSIsms in ATA.

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MFp4:
Organize device IDs and add some more of them.

Do not unarm callout on request completion and change slot selection
algorithm as done in ahci(4). This saves some CPU time on high request
rates.

MFp4:
- Rework timeout handling, to make it more graceful for devices sharing
controller port (with PMP). Wait for other commands completion/timeout
before initiating recovery.
- Handle timeouts and

MFp4:
- Rework timeout handling, to make it more graceful for devices sharing
controller port (with PMP). Wait for other commands completion/timeout
before initiating recovery.
- Handle timeouts and fatal errors with port hard-reset. The rest of
recovery will be done by XPT on receiving async event. More gracefull
per-device soft-reset recovery can be implemented later.

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Reimplement device reset sequence in more controller-specific way.

MFp4:
Report real max_target = 15. SIM doesn't need to know that target 15 is PMP.
It is XPT business.

MFp4:
Freeze device queue on error to permit periph driver to do proper recovery.

On command timeout handle frozen command first, to not run it inside
XXX_end_transaction().

Submitted by: avg

Merge from head

- MFC from head@196987

MFC r196655:
Update siis driver:
- Add SNTF support.
- Do not report meaningless transport/protocol versions.

Approved by: re (ATA-CAM blanket)

MFp4:
- Add SNTF support.
- Do not report meaningless transport/protocol versions.

- MFC @196061

Add `siis` CAM driver for SiliconImage SiI3124/3132/3531 SATA2 controllers.

Driver supports Serial ATA and ATAPI devices, Port Multipliers
(including FIS-based switching), hardware command queues (3

Add `siis` CAM driver for SiliconImage SiI3124/3132/3531 SATA2 controllers.

Driver supports Serial ATA and ATAPI devices, Port Multipliers
(including FIS-based switching), hardware command queues (31 command
per port) and Native Command Queuing. This is probably the second on
popularity, after AHCI, type of SATA2 controllers, that benefits from
using CAM, because of hardware command queuing support.

Approved by: re (kib)

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Enable MSI by default for SiI3124.

MFp4:
After last running command completed, give commands in timeout state
second time.

Use new helper functions to set PCIe max read request size.

- Give ATA/SATA SIMs info about ATAPI packet size, supported by device.
- Make ATA XPT to reject longer SCSI CDBs then supported by device, or
any SCSI CDBs, if device doesn't support ATAPI.

Reset port on disconnect event, to abort any running requests.

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

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.

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Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.

Usually these controllers are able to automatically decode command code to
get required command protocol. But they have no idea about new commands,
such as DATA SET MANAGEMENT (TRIM). As soon as this

Usually these controllers are able to automatically decode command code to
get required command protocol. But they have no idea about new commands,
such as DATA SET MANAGEMENT (TRIM). As soon as this info any way provided
by CAM, give controller specific instructions.

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Increase Max Read Request Size for PCIe chips from 512 to 1024 bytes.
It gives those beasts additional 10% of write bandwidth.

Explicitly acknowledge MSI completion, as required by SiI3124 datasheet.
It makes MSI working there. Later (and cheaper) PCIe chips (3132/3531)
still randomly crashing system in few seconds of high M

Explicitly acknowledge MSI completion, as required by SiI3124 datasheet.
It makes MSI working there. Later (and cheaper) PCIe chips (3132/3531)
still randomly crashing system in few seconds of high MSI rates, generating
something inaporopriate, like NMI or "Fatal trap 30".

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SiI3124 has no SNotification register. Handle Asynchronous Notifications
there without it as good as possible.