[Bug 191810] New: some SSDs should use UNMAP instead of ATA_TRIM

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191810

            Bug ID: 191810
           Summary: some SSDs should use UNMAP instead of ATA_TRIM
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: [e-mail]
          Reporter: [e-mail]

System: FreeBSD fearless2 10.0-RELEASE-p7 FreeBSD 10.0-RELEASE-p7 #0: Wed Jul 9
12:19:19 EDT 2014 root@fearless2:/usr/obj/usr/src/sys/CAMDEBUG amd64

On my SSDs (IBM TX21B10400GE8IBM) UNMAP should be used instead of ATA_TRIM as
UNMAP seems much more reliable.

Using TRIM, I get frequent timeouts:
http://pastie.org/pastes/9368423/text?key=i4gmruxdtjars9fduq8w

(da6:mps1:0:5:0): ATA COMMAND PASS THROUGH(16). CDB: 85 0d 06 00 01 00 03 00 00
00 00 00 00 40 06 00 
(da6:mps1:0:5:0): CAM status: Command timeout
(da6:mps1:0:5:0): Retrying command

Is it possible to default to using UNMAP, if not for everything than for
whitelisted devices?

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