Commit Graph

90 Commits

Author SHA1 Message Date
Alexander Motin
0bb3f1d367 When requesting sense data for SIM not doing it automatically (such as
ATAPI or USB), request only as much data as requested by consumer.
On the way back -- report how much sense data we have actually received.
2010-11-08 15:59:41 +00:00
Matt Jacob
f1e2546a8c Protect periph drivers list and rearrange things to minimize the chance of
stepping oneself during probing.

Don't blindly decrement a periph probe count.

Reviewed by:	scsi@
Obtained from:	Alexander Motin, Atillio Rao, Others
MFC after:	1 month
2010-06-02 18:06:32 +00:00
Alexander Motin
83c5d981ac 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.
2010-01-28 08:41:30 +00:00
Alexander Motin
1f1158b28d MFp4:
Some more missed parts from previous commits.
2009-11-14 20:30:42 +00:00
Alexander Motin
d84c90a6cb MFp4:
Fix several device freeze counting bugs.
2009-11-14 20:13:38 +00:00
Alexander Motin
379ad35853 MFp4:
Implement device stats accounting for ATA commands.
2009-11-05 08:55:24 +00:00
Alexander Motin
8691755dff MFp4:
Improve reporting ATA Status error details.
2009-11-03 11:19:05 +00:00
Alexander Motin
0f3e215954 Make "Retrying Command" to be printed before actual retrying.
It should make debug/error log a bit more readable.
2009-10-23 13:39:30 +00:00
Alexander Motin
bbfa4aa1a6 Replace most of priority numbers with defines. No logical changes. 2009-10-23 08:27:55 +00:00
Alexander Motin
01a967e266 MFp4:
If on sense request device returns no sence, give up and return,
or we may loop forever.
2009-09-22 22:23:52 +00:00
Scott Long
52c9ce25d8 Separate the parallel scsi knowledge out of the core of the XPT, and
modularize it so that new transports can be created.

Add a transport for SATA

Add a periph+protocol layer for ATA

Add a driver for AHCI-compliant hardware.

Add a maxio field to CAM so that drivers can advertise their max
I/O capability.  Modify various drivers so that they are insulated
from the value of MAXPHYS.

The new ATA/SATA code supports AHCI-compliant hardware, and will override
the classic ATA driver if it is loaded as a module at boot time or compiled
into the kernel.  The stack now support NCQ (tagged queueing) for increased
performance on modern SATA drives.  It also supports port multipliers.

ATA drives are accessed via 'ada' device nodes.  ATAPI drives are
accessed via 'cd' device nodes.  They can all be enumerated and manipulated
via camcontrol, just like SCSI drives.  SCSI commands are not translated to
their ATA equivalents; ATA native commands are used throughout the entire
stack, including camcontrol.  See the camcontrol manpage for further
details.  Testing this code may require that you update your fstab, and
possibly modify your BIOS to enable AHCI functionality, if available.

This code is very experimental at the moment.  The userland ABI/API has
changed, so applications will need to be recompiled.  It may change
further in the near future.  The 'ada' device name may also change as
more infrastructure is completed in this project.  The goal is to
eventually put all CAM busses and devices until newbus, allowing for
interesting topology and management options.

Few functional changes will be seen with existing SCSI/SAS/FC drivers,
though the userland ABI has still changed.  In the future, transports
specific modules for SAS and FC may appear in order to better support
the topologies and capabilities of these technologies.

The modularization of CAM and the addition of the ATA/SATA modules is
meant to break CAM out of the mold of being specific to SCSI, letting it
grow to be a framework for arbitrary transports and protocols.  It also
allows drivers to be written to support discrete hardware without
jeopardizing the stability of non-related hardware.  While only an AHCI
driver is provided now, a Silicon Image driver is also in the works.
Drivers for ICH1-4, ICH5-6, PIIX, classic IDE, and any other hardware
is possible and encouraged.  Help with new transports is also encouraged.

Submitted by:	scottl, mav
Approved by:	re
2009-07-10 08:18:08 +00:00
Scott Long
571e8e20da Change cam_periph_ioctl() to take 'cmd' and a u_long instead of an
int.  All of its callers pass in cmd as a u_long, so this has
always been a dangerous type demotion.  It was spooted by clang/llvm
trying to do a type promotion and sign extension within
cam_periph_ioctl.

Submitted by:	rdivacky
2009-06-22 14:43:48 +00:00
Edward Tomasz Napierala
9b61a5b95e Add missing free(9) in error case.
Found with:	Coverity Prevent(tm)
CID:		4224
2009-05-12 15:14:37 +00:00
Max Khon
aa812d9e2a cam_periph_alloc: fix "invalid periph name" error condition
Found with:	Coverity Prevent(tm)
CID:		130
2009-02-09 17:02:54 +00:00
John Baldwin
1fa738c26f Now that mtx_sleep/msleep can accept Giant as the interlock, simplify the
CAM locking code slightly to no longer special case sleeping when a sim
uses Giant for its lock.

Tested by:	trasz
2009-01-26 15:01:47 +00:00
Edward Tomasz Napierala
53f8b22b34 Guard against NULL pointer dereference.
Reviewed by:	scottl
Approved by:	rwatson (mentor)
Sponsored by:	FreeBSD Foundation
Found with:	Coverity Prevent(tm)
CID:		130
2009-01-23 21:03:59 +00:00
Edward Tomasz Napierala
24ebf56636 Periph driver fixes, second try.
Reviewed by:	scottl
Approved by:	rwatson (mentor)
Sponsored by:	FreeBSD Foundation
2008-12-19 14:31:40 +00:00
Edward Tomasz Napierala
a4e2e711a5 Move mtx_assert lower, when we can be sure that the pointer
to the mutex is valid.

Reviewed by:	scottl
Approved by:	rwatson (mentor)
Sponsored by:	FreeBSD Foundation
2008-12-19 14:27:10 +00:00
Edward Tomasz Napierala
1fa9ee7d60 Revert r186186 for now; it breaks stuff.
Approved by:	rwatson (mentor)
2008-12-17 10:49:03 +00:00
Edward Tomasz Napierala
f5bc800067 Fix locking in periph drivers - don't try to unlock periph
that was already deallocated.

Reviewed by:	scottl
Approved by:	rwatson (mentor)
Sponsored by:	FreeBSD Foundation
2008-12-16 17:01:52 +00:00
Rafal Jaworowski
af3c383a98 Fix typo.
Approved by:	cognet (mentor)
2008-02-12 11:07:33 +00:00
Scott Long
0dd50e9b5e Eliminate the use of M_TEMP. 2007-05-14 21:48:53 +00:00
Scott Long
77dc25cc98 Retire the spl() markers. Add in some minor missed locking as a result. 2007-04-19 23:34:51 +00:00
Scott Long
11e4face2d Inline cam_periph_lock|unlock to make debugging easier. Use more
CAM_SIM_LOCK() more uniformly.
2007-04-19 22:46:26 +00:00
Scott Long
f35487464c Drop the topology lock before calling the periph oninvalidate and dtor
vectors.
2007-04-16 19:42:23 +00:00
Scott Long
2b83592fdc Remove Giant from CAM. Drivers (SIMs) now register a mutex that CAM will
use to synchornize and protect all data objects that are used for that
SIM.  Drivers that are not yet MPSAFE register Giant and operate as
usual.  RIght now, no drivers are MPSAFE, though a few will be changed
in the coming week as this work settles down.

The driver API has changed, so all CAM drivers will need to be recompiled.
The userland API has not changed, so tools like camcontrol do not need to
be recompiled.
2007-04-15 08:49:19 +00:00
Matt Jacob
f0d9af51a1 Add an xpt_print function to reduce most of the xpt_print_path/printf
pairs. Convert the core code to use it.

Reviewed by:	scsi (various folks weighing in with good advice)
MFC after:	2 weeks
2006-12-05 07:45:28 +00:00
Matt Jacob
73cf209ffb Put a bit of hysteresis into both BUSY SCSI status returns
and CAM_RESRC_UNAVAIL returns. Delay a tunable amount for
either between retries.

This came up because the MPT IOC was returning "IOC out of
resources" for some user and this caused a CAM_RESRC_UNAVAIL
return. Putting a bit of delay between retries helped them
out.

There was some discussion that an async event should be used
to clear CAM_RESRC_UNAVAIL. That's probably a better notion
eventually.

Reviewed by:	scsi@freebsd.org (ade, scott)
MFC after:	1 week
2006-10-01 20:23:50 +00:00
Matt Jacob
a62525f3c8 Make physical buffers in cam_periph_mapmem owned by the kernel in case we
return to user space w/o waiting for I/O to complete.

I tried to get several folks who know this code better than me to review it
with no luck. I *do* know that w/o this code, using the SCSI target driver
panics in userret (if it doesn't panic in knote first).
2006-05-24 15:22:21 +00:00
Ian Dowse
9a014e6f69 There should be no need to retry when the CCB status code is
CAM_LUN_INVALID or CAM_TID_INVALID. Retries were being triggered
here when a umass device was unplugged, and while the retries
themselves are probably harmless, they complicated finding the real
SIM removal problems.
2006-01-08 20:04:55 +00:00
Tai-hwa Liang
362abc449c - Providing fine-grained malloc statistic by replacing M_DEVBUF with
module-specific malloc types.  These should help us to pinpoint the
  possible memory leakage in the future.
- Implementing xpt_alloc_ccb_nowait() and replacing all malloc/free based
  CCB memory management with xpt_alloc_ccb[_nowait]/xpt_free_ccb.  Hopefully
  this would be helpful if someday we move the CCB allocator to use UMA
  instead of malloc().

Encouraged by:	jeffr, rwatson
Reviewed by:	gibbs, scottl
Approved by:	re (scottl)
2005-07-01 15:21:30 +00:00
Scott Long
661658a6fa Protect against trying to free a non-existant peripheral.
Submitted by: Coverity Prevent analysis tool
MFC After: 3 days
2005-02-20 23:45:49 +00:00
Warner Losh
898b0535b7 Start each of the license/copyright comments with /*- 2005-01-05 22:34:37 +00:00
Justin T. Gibbs
74c91ec564 Correct a typo in a comment: alloation->allocation
Reported by: Jens Schweikhardt <schweikh@schweikhardt.net>
2004-08-30 20:14:21 +00:00
Scott Long
8226fdbdce Don't be so chatty when performing manual sense. This should make ATAPICAM
devices a lot more quiet.
2003-11-08 10:56:57 +00:00
Kenneth D. Merry
65afe1f454 In camperiphdone(), make sure we check for fatal errors and bail out
instead of retrying them blindly.

This should fix some of the problems people have been having with cdrom
drives taking a long time to probe.  This should also eliminate the need
for the initial TUR in cdsize().

cam_periph.c:	Don't keep retrying if the error we get back is a fatal
		error.  This should help us detect the transition from
		"Logical unit not ready, cause not reportable" to "Medium
		not present" in the "TUR many" handler.  (The TUR many
		handler gets triggered for Logical unit not ready, cause
		not reportable errors.)

scsi_cd.c:	Remove the initial test unit ready in cdsize().  Hopefully
		it isn't necessary after the above change.

Submitted by:	gibbs (mostly)
Tested by:	peter
MFC After:	2 weeks
2003-10-27 06:15:55 +00:00
Poul-Henning Kamp
f485bd3a10 There is no need to muck about with the B_PHYS flag here. We never even
get close to DEV_STRATEGY() which is the only place it is relevant.
2003-10-18 11:01:11 +00:00
Thomas Quinot
86addc5271 (camperiphdone): When the cam_periph layer performs sense recovery,
completion of recovery is indicated by positioning the CAM_AUTOSNS_VALID
 bit in the status field of the CCB, not in the flags field.
This fixes an endless loop of sense recovery actions.

Reviewed by:	ken
2003-09-21 08:42:32 +00:00
Alan Cox
8373f36dbb In case vmapbuf() fails, release all of the held resources.
Submitted by:	tegge
2003-09-10 18:23:43 +00:00
David E. O'Brien
9c963d873e Use __FBSDID(). 2003-06-10 17:50:20 +00:00
Poul-Henning Kamp
058675037b Add /* FALLTHROUGH */
Found by:	FlexeLint
2003-06-01 09:01:02 +00:00
Poul-Henning Kamp
7379c88f4f Add /* FALLTHROUGH */
Found by:       FlexeLint
2003-05-31 18:20:26 +00:00
Alan Cox
270086ec64 Sufficient access checks are performed by vmapbuf() that calling useracc()
is pointless.  Remove the calls to useracc().
2003-04-06 22:21:03 +00:00
Poul-Henning Kamp
7194d335cf Run a revision of the devstat interface:
Kernel:

Change statistics to use the *uptime() timescale (ie: relative to
boottime) rather than the UTC aligned timescale.  This makes the
device statistics code oblivious to clock steps.

Change timestamps to bintime format, they are cheaper.

Remove the "busy_count", and replace it with two counter fields:
"start_count" and "end_count", which are updated in the down and
up paths respectively.  This removes the locking constraint on
devstat.

Add a timestamp argument to devstat_start_transaction(), this will
normally be a timestamp set by the *_bio() function in bp->bio_t0.
Use this field to calculate duration of I/O operations.

Add two timestamp arguments to devstat_end_transaction(), one is
the current time, a NULL pointer means "take timestamp yourself",
the other is the timestamp of when this transaction started (see
above).

Change calculation of busy_time to operate on "the salami principle":
Only when we are idle, which we can determine by the start+end
counts being identical, do we update the "busy_from" field in the
down path.  In the up path we accumulate the timeslice in busy_time
and update busy_from.

Change the byte_* and num_* fields into two arrays: bytes[] and
operations[].

Userland:

Change the misleading "busy_time" name to be called "snap_time" and
make the time long double since that is what most users need anyway,
fill it using clock_gettime(CLOCK_MONOTONIC) to put it on the same
timescale as the kernel fields.

Change devstat_compute_etime() to operate on struct bintime.

Remove the version 2 legacy interface: the change to bintime makes
compatibility far too expensive.

Fix a bug in systat's "vm" page where boot relative busy times would
be bogus.

Bump __FreeBSD_version to 500107

Review & Collaboration by:	ken
2003-03-15 21:59:06 +00:00
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Alfred Perlstein
44956c9863 Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
Matthew Dillon
2d5c7e4506 Close the remaining user address mapping races for physical
I/O, CAM, and AIO.  Still TODO: streamline useracc() checks.

Reviewed by:	alc, tegge
MFC after:	7 days
2003-01-20 17:46:48 +00:00
Warner Losh
e3c29144fe Panic message strings do not need a trailing \n.
Reviewed by: ken
2002-11-14 05:35:57 +00:00
Brooks Davis
3a93719872 Make SCSI_DELAY setable at boot time and runtime via the
kern.cam.scsi_delay tunable/sysctl.

Reviewed by:	mdodd, njl
2002-09-02 20:10:19 +00:00
Peter Wemm
a5074f708e Add some \n's to printf()s 2002-08-24 02:51:28 +00:00