for the r248519:
For the cam-attached HBAs, allow the driver to specify that it accepts
the unmapped bio by the PIM_UNMAPPED flag. The CAM passes the
CAM_DATA_BIO data transfer type request for the unmapped bio, and the
driver could use the bus_dmamap_load_ccb() as a helper to
transparently handle the ccb.
Sponsored by: The FreeBSD Foundation
Reviewed by: scottl
Tested by: pho, scottl
The vnode-backed md(4) has to map the unmapped bio because VOP_READ()
and VOP_WRITE() interfaces do not allow to pass unmapped requests to
the filesystem. Vnode-backed md(4) uses pbufs instead of relying on
the bio_transient_map, to avoid usual md deadlock.
Sponsored by: The FreeBSD Foundation
Tested by: pho, scottl
tunable by default.
This will allow GENERIC configurations to boot on small memory boxes, but
not require end users who want to use CTL to recompile their kernel. They
can simply set kern.cam.ctl.disable=0 in loader.conf.
The eventual solution to the memory usage problem is to change the way
CTL allocates memory to be more configurable, but this should fix things
for small memory situations in the mean time.
UPDATING: Explain the change in the CTL configuration, and
how users can enable CTL if they would like to use
it.
sys/conf/options: Add a new option, CTL_DISABLE, that prevents CTL
from initializing.
ctl.c: If CTL_DISABLE is turned on, don't initialize.
i386/conf/GENERIC,
amd64/conf/GENERIC: Re-enable device ctl, and add the CTL_DISABLE
option.
PREVENT ALLOW MEDIUM REMOVAL commands return errors on these devices
without returning sense data. In some cases unrelated following commands
start to return errors too, that makes device to be dropped by CAM.
every architecture's busdma_machdep.c. It is done by unifying the
bus_dmamap_load_buffer() routines so that they may be called from MI
code. The MD busdma is then given a chance to do any final processing
in the complete() callback.
The cam changes unify the bus_dmamap_load* handling in cam drivers.
The arm and mips implementations are updated to track virtual
addresses for sync(). Previously this was done in a type specific
way. Now it is done in a generic way by recording the list of
virtuals in the map.
Submitted by: jeff (sponsored by EMC/Isilon)
Reviewed by: kan (previous version), scottl,
mjacob (isp(4), no objections for target mode changes)
Discussed with: ian (arm changes)
Tested by: marius (sparc64), mips (jmallet), isci(4) on x86 (jharris),
amd64 (Fabian Keil <freebsd-listen@fabiankeil.de>)
Make umass return an error code if SCSI sense retrieval request
has failed. Make sure scsi_error_action honors SF_NO_RETRY and
SF_NO_RECOVERY in all cases, even if it cannot parse sense bytes.
Reviewed by: hselasky (umass), scottl (cam)
to avoid sending extra READ CAPACITY requests by dastart(). Schedule periph
again on reprobe completion, or otherwise it may stuck indefinitely long.
This should fix USB explore thread hanging on device unplug, waiting for
periph destruction.
Reported by: hselasky
and da_default_timeout where their current hardcoded values matched the current
default value for said tunables.
PR: kern/169976
Reviewed by: pjd (mentor)
Approved by: mav
DISKFLAG_CANDELETE. While this change makes this layer consistent
other layers such as UFS and ZFS BIO_DELETE support may not notice
any change made manually via these device sysctls until the device
is reopened via a mount.
Also corrected var order in dadeletemethodsysctl
PR: kern/169801
Reviewed by: pjd (mentor)
Approved by: mav
MFC after: 2 weeks
Previously CTL would leave individual LUNs enabled in the target
driver, whether or not the port as a whole was enabled. It would
also leave the wildcard LUN enabled indefinitely.
This change means that CTL will enable and disable any active LUNs,
as well as the wildcard LUN, when enabling and disabling a port.
Also, fix a bug that could crop up due to an uninitialized CCB
type.
ctl.c: Before calling ctl_frontend_online(), run through
the LUN list and enable all active LUNs.
After calling ctl_frontend_offline(), run through
the LUN list and disble all active LUNs.
scsi_ctl.c: Before bringing a port online, allocate the
wildcard peripheral for that bus. And after taking
a port offline, invalidate the wildcard peripheral
for that bus.
Make sure that we hold the SIM lock around all
calls to xpt_action() and other transport layer
interfaces that require it.
Use CAM_SIM_{LOCK|UNLOCK} consistently to acquire
and release the SIM lock.
Update a number of outdated comments. Some of
these should have been fixed long ago.
Actually do LUN disbables now. The newer drivers
in the tree work correctly for this as far as I
know.
Initialize the CCB type to CTLFE_CCB_DEFAULT to
avoid a panic due to uninitialized memory.
Submitted by: Chuck Tuffli (partially)
MFC after: 1 week
ctl_frontend_cam_sim.c: Coalesce cfcs_online() and cfcs_offline()
into a single function since these were
identical except for one line.
Make sure we hold the SIM lock around path
creation, and calling xpt_rescan().
scsi_ctl.c: In ctlfe_onoffline(), make sure we hold the
SIM lock around path creation and free
calls, as well as xpt_action().
In ctlfe_lun_enable(), hold the SIM lock
around path and peripheral operations that
require it.
Sponsored by: Spectra Logic Corporation
MFC after: 1 week
while doing a copyout. That can cause a panic, because copyout
can trigger VM faults, and we can't handle VM faults while holding
a mutex.
The solution here is to malloc a separate buffer to hold the OOA
queue entries, so that we don't risk a VM fault while filling up
the buffer and we don't have to drop the lock. The other solution
would be to wire the user's memory while filling their buffer with
copyout, but that would have been a little more complex.
Also fix a debugging parenthesis issue in ctl_abort_task() pointed
out by Chuck Tuffli.
Sponsored by: Spectra Logic Corporation
MFC after: 1 week
drivers.
The bug occurrs when a userland process has the driver instance
open and the underlying device goes away. We get the devfs
callback that the device node has been destroyed, but not all of
the closes necessary to fully decrement the reference count on the
CAM peripheral.
The reason is that once devfs calls back and says the device has
been destroyed, it is moved off to deadfs, and devfs guarantees
that there will be no more open or close calls. So the solution
is to keep track of how many outstanding open calls there are on
the device, and just release that many references when we get the
callback from devfs.
scsi_pass.c,
scsi_enc.c,
scsi_enc_internal.h: Add an open count to the softc in these
drivers. Increment it on open and
decrement it on close.
When we get a devfs callback to say that
the device node has gone away, decrement
the peripheral reference count by the
number of still outstanding opens.
Make sure we don't access the peripheral
with cam_periph_unlock() after what might
be the final call to
cam_periph_release_locked(). The
peripheral might have been freed, and we
will be dereferencing freed memory.
scsi_ch.c,
scsi_sg.c: For the ch(4) and sg(4) drivers, add the
same changes described above, and in
addition, fix another bug that was
previously fixed in the pass(4) and enc(4)
drivers.
These drivers were calling destroy_dev()
from their cleanup routine, but that could
cause a deadlock because the cleanup
routine could be indirectly called from
the driver's close routine. This would
cause a deadlock, because the device node
is being held open by the active close
call, and can't be destroyed.
Sponsored by: Spectra Logic Corporation
MFC after: 1 week
The problem was a race condition between the EDT traversal used by
things like 'camcontrol devlist', and CAM peripheral driver
removal.
The EDT traversal code holds the CAM topology lock, and wants
to show devices that have been invalidated. It acquires a
reference to the peripheral to make sure the peripheral it is
examining doesn't go away.
However, because the peripheral removal code in camperiphfree()
drops the CAM topology lock to call the peripheral's destructor
routine, we can run into a situation where the EDT traversal
increments the peripheral reference count after free process is
already in progress. At that point, the reference count is
ignored, because it was 0 when we started the process.
Fix this race by setting a flag, CAM_PERIPH_FREE, that I previously
added and checked in xptperiphtraverse() and xptpdperiphtravsere(),
but failed to use. If the EDT traversal code sees that flag,
it will know that the peripheral free process has already started,
and that it should not access that peripheral.
Also, fix an inconsistency in the locking between
xptpdperiphtraverse() and xptperiphtraverse(). They now both
hold the CAM topology lock while calling the peripheral traversal
function.
cam_xpt.c: Change xptperiphtraverse() to hold the CAM topology
lock across calls to the traversal function.
Take out the comment in xptpdperiphtraverse() that
referenced the locking inconsistency.
cam_periph.c: Set the CAM_PERIPH_FREE flag when we are in the
process of freeing a peripheral driver.
Sponsored by: Spectra Logic Corporation
MFC after: 1 week
The device reports support for SATA Asynchronous Notification in its
IDENTIFY data, but returns error on attempt to enable that feature.
Make SATA XPT of CAM only report these errors, but not fail the device.
MFC after: 1 week
Element Descriptor page if it is not supported. This removes one error
message from verbose logs during boot on systems with some enclosures.
Sponsored by: iXsystems, Inc.
safe in some cases to reduce CCB priority after it was scheduled with high
priority. This fixes reproducible deadlock when command sent through the
pass interface while ATA XPT recovers from command timeout.
Instead of that enforce priority at passioctl(). libcam provides no obvious
interface to specify CCB priority and so much (all?) code specifies zero
(highest) priority. This change limits pass CCBs priority to NORMAL run
level, allowing XPT to complete bus and device recovery after reset before
running any payload.
In particular, do not lock Giant conditionally when calling into the
filesystem module, remove the VFS_LOCK_GIANT() and related
macros. Stop handling buffers belonging to non-mpsafe filesystems.
The VFS_VERSION is bumped to indicate the interface change which does
not result in the interface signatures changes.
Conducted and reviewed by: attilio
Tested by: pho
System time is set later on boot process then initial bus scan by CAM.
Until that moment microtime() is equal to microuptime(), and if system
boots quickly, the value can be close to zero. That causes settle time
waiting even for buses that don't use reset during probe.
On my test system this reduces boot time by 1 second if USB enabled, or
by 4 seconds if USB disabled. CAM waited for ctl2cam0 bus "settle".
- Extend the lock to cover xpt_path_release() for the new path.
- While xpt_action() is called while holding right SIM lock for the new
bus, the old path release may require different SIM lock. So we have
to temporary drop the new lock and get the old one.
without holding SIM lock. It really doesn't need that lock, but adding it
removes that specific exception, allowing to assert locking there later.
Submitted by: ken@ (earlier version)
It is required to store extra recovery requests in case of bus resets.
On ATA/SATA this fixes assertion panics on HEAD with INVARIANTS enabled or
possible memory corruptions otherwise if timeout/reset happens when device
CCB queue is already full.
Reported by: gibbs@
MFC after: 1 week
returns zero while request status is not CAM_REQ_CMP. That could cause
partial device attach or other unexpected results.
Found by: Clang Static Analyzer
drivers:
- Remove scsi_low_pisa.*, they were unused.
- Remove <compat/netbsd/physio_proc.h> and calls to the stubs in that
header. They were empty nops.
- Retire sl_xname and use device_get_nameunit() and device_printf() with
the underlying device_t instead.
- Remove unused {ct,ncv,nsp,stg}print() functions.
- Remove empty SOFT_INTR_REQUIRED() macro and the unused sl_irq member.
NetBSD/pc98 was never merged into the main NetBSD tree and is no longer
developed. Adding locking to these drivers would have made the compat
shims hard to impossible to maintain, so remove the shims to ease
future changes.
These changes were verified by md5. Some additional shims can be removed
that do affect the compiled results that I will probably do in another
round.
Approved by: nyan (tentatively)
of this hardware still running (close to twenty years now).
2. Quiesece and use ENC_VLOG instead of ENC_LOG for most
complaints. That is, they're visible with bootverbose, but
otherwise quiesced and not repeatedly spamming messages
with constant reminders that hardware in this space is
rarely fully compliant.
MFC after: 1 month
'encapsulating interface' used with IPsec and has nothing to do with
storage 'enclosure' services.
MFC after: 3 days
Noticed while: debugging why enc(4) is no longer automatically created
It includes three parts:
1) Modifications to CAM to detect media media changes and report them to
disk(9) layer. For modern SATA (and potentially UAS) devices it utilizes
Asynchronous Notification mechanism to receive events from hardware.
Active polling with TEST UNIT READY commands with 3 seconds period is used
for incapable hardware. After that both CD and DA drivers work the same way,
detecting two conditions: "NOT READY: Medium not present" after medium was
detected previously, and "UNIT ATTENTION: Not ready to ready change, medium
may have changed". First one reported to disk(9) as media removal, second
as media insert/change. To reliably receive second event new
AC_UNIT_ATTENTION async added to make UAs broadcasted to all periphs by
generic error handling code in cam_periph_error().
2) Modifications to GEOM core to handle media remove and change events.
Media removal handled by spoiling all consumers attached to the provider.
Media change event also schedules provider retaste after spoiling to probe
new media. New flag G_CF_ORPHAN was added to consumers to reflect that
consumer is in process of destruction. It allows retaste to create new
geom instance of the same class, while previous one is still dying.
3) Modifications to some GEOM classes: DEV -- to report media change
events to devd; VFS -- to handle spoiling same as orphan to prevent
accessing replaced media. PART class already handles spoiling alike to
orphan.
Reviewed by: silence on geom@ and scsi@
Tested by: avg
Sponsored by: iXsystems, Inc. / PC-BSD
MFC after: 2 months
data pointer. This is a temp fix that resubmits the
command, adjusted, so that the backend can fetch the
data again.
Sponsored by: Spectralogic
MFC after: 1 month
Just free inclomplete daemon cache instead to let it retry next time.
Premature ses_softc_cleanup() caused NULL dereference when freed softc
was accessed later.
Renamed the kern.cam.ada.ada_send_ordered sysctl and tunable to
kern.cam.ada.send_ordered, more in line with the other da sysctls/tunables.
Suggested by: kib
kern.cam.da.send_ordered, more in line with the other da sysctls/tunables.
PR: 169765
Submitted by: Steven Hartland <steven.hartland@multiplay.co.uk>
Reviewed by: mav
a CD or DVD drive with a damaged disc often benefit from a shorter
timeout. Also, when retries are set to 0, an application is expecting
errors and recovering them so do not print the error into the log.
The number of expected errors can literally be in the hundreds of
thousands which significantly slows data recovery.
Reviewed by: ken@ (but quite some time ago).
to attach to target capable HBAs that implement the old immediate
notify (XPT_IMMED_NOTIFY) and notify acknowledge (XPT_NOTIFY_ACK)
CCBs. The new API has been in place since SVN change 196008 in
2009.
The solution is two-fold: fix CTL to handle the responses from the
HBAs, and convert the HBA drivers in question to use the new API.
These drivers have not been tested with CTL, so how well they will
interoperate with CTL is unknown.
scsi_target.c: Update the userland target example code to use the
new immediate notify API.
scsi_ctl.c: Detect when an immediate notify CCB is returned
with CAM_REQ_INVALID or CAM_PROVIDE_FAIL status,
and just free it.
Fix a duplicate assignment.
aic79xx.c,
aic79xx_osm.c: Update the aic79xx driver to use the new API.
Target mode is not enabled on for this driver, so
the changes will have no practical effect.
aic7xxx.c,
aic7xxx_osm.c: Update the aic7xxx driver to use the new API.
sbp_targ.c: Update the firewire target code to work with the
new API.
mpt_cam.c: Update the mpt(4) driver to work with the new API.
Target mode is only enabled for Fibre Channel
mpt(4) devices.
MFC after: 3 days
a da(4) instance going away while GEOM is still probing it.
In this case, the GEOM disk class instance has been created by
disk_create(), and the taste of the disk is queued in the GEOM
event queue.
While that event is queued, the da(4) instance goes away. When the
open call comes into the da(4) driver, it dereferences the freed
(but non-NULL) peripheral pointer provided by GEOM, which results
in a panic.
The solution is to add a callback to the GEOM disk code that is
called when all of its resources are cleaned up. This is
implemented inside GEOM by adding an optional callback that is
called when all consumers have detached from a provider, and the
provider is about to be deleted.
scsi_cd.c,
scsi_da.c: In the register routine for the cd(4) and da(4)
routines, acquire a reference to the CAM peripheral
instance just before we call disk_create().
Use the new GEOM disk d_gone() callback to register
a callback (dadiskgonecb()/cddiskgonecb()) that
decrements the peripheral reference count once GEOM
has finished cleaning up its resources.
In the cd(4) driver, clean up open and close
behavior slightly. GEOM makes sure we only get one
open() and one close call, so there is no need to
set an open flag and decrement the reference count
if we are not the first open.
In the cd(4) driver, use cam_periph_release_locked()
in a couple of error scenarios to avoid extra mutex
calls.
geom.h: Add a new, optional, providergone callback that
is called when a provider is about to be deleted.
geom_disk.h: Add a new d_gone() callback to the GEOM disk
interface.
Bump the DISK_VERSION to version 2. This probably
should have been done after a couple of previous
changes, especially the addition of the d_getattr()
callback.
geom_disk.c: Add a providergone callback for the disk class,
g_disk_providergone(), that calls the user's
d_gone() callback if it exists.
Bump the DISK_VERSION to 2.
geom_subr.c: In g_destroy_provider(), call the providergone
callback if it has been provided.
In g_new_geomf(), propagate the class's
providergone callback to the new geom instance.
blkfront.c: Callers of disk_create() are supposed to pass in
DISK_VERSION, not an explicit disk API version
number. Update the blkfront driver to do that.
disk.9: Update the disk(9) man page to include information
on the new d_gone() callback, as well as the
previously added d_getattr() callback, d_descr
field, and HBA PCI ID fields.
MFC after: 5 days
defect information it has before grabbing the full defect list.
This works around a bug with some Hitachi drives that generate data overrun
errors when they are asked for more defect data than they have.
The change is done in a spec-compliant way, so it should have no negative
impact on drives that don't have this issue.
This is based on work originally done at Sandvine.
scsi_da.h: Add a define for the maximum amount of data that can be
contained in a defect list.
camcontrol.c: Update the readdefects() function to issue an initial
command to determine the length of the defect list, and
then use that length in the request for the full defect
list.
camcontrol.8: Add a note that some drives will report 0 defects available
if you don't request either the PLIST or GLIST.
Submitted by: Mark Johnston <markjdb@gmail.com> (original version)
MFC after: 3 days
done queue. Clearing it before caused extra SIM queueing in some cases.
It was invisible during normal operation, but during USB device unplug and
respective SIM destruction it could keep pointer on SIM without having
counted reference and as result crash the system by use afer free.
Reported by: hselasky
MFC after: 1 week
invalidated while open, cam_periph_hold() will return error and won't
get the reference. Following reference release will crash the system.
Sponsored by: iXsystems, Inc.
MFC after: 3 days
the pass(4) and enc(4) drivers and devfs.
The pass(4) driver uses the destroy_dev_sched() routine to
schedule its device node for destruction in a separate thread
context. It does this because the passcleanup() routine can get
called indirectly from the passclose() routine, and that would
cause a deadlock if the close routine tried to destroy its own
device node.
In any case, once a particular passthrough driver number, e.g.
pass3, is destroyed, CAM considers that unit number (3 in this
case) available for reuse.
The problem is that devfs may not be done cleaning up the previous
instance of pass3, and will panic if isn't done cleaning up the
previous instance.
The solution is to get a callback from devfs when the device node
is removed, and make sure we hold a reference to the peripheral
until that happens.
Testing exposed some other cases where we have reference counting
issues, and those were also fixed in the pass(4) driver.
cam_periph.c: In camperiphfree(), reorder some of the operations.
The peripheral destructor needs to be called before
the peripheral is removed from the peripheral is
removed from the list. This is because once we
remove the peripheral from the list, and drop the
topology lock, the peripheral number may be reused.
But if the destructor hasn't been called yet, there
may still be resources hanging around (like devfs
nodes) that haven't been fully cleaned up.
cam_xpt.c: Add an argument to xpt_remove_periph() to indicate
whether the topology lock is already held.
scsi_enc.c: Acquire an extra reference to the peripheral during
registration, and release it once we get a callback
from devfs indicating that the device node is gone.
Call destroy_dev_sched_cb() in enc_oninvalidate()
instead of calling destroy_dev() in the cleanup
routine.
scsi_pass.c: Add reference counting to handle peripheral and
devfs object lifetime issues.
Add a reference to the peripheral and the devfs
node in the peripheral registration.
Don't attempt to add a physical path alias if the
peripheral has been marked invalid.
Release the devfs reference once the initial
physical path alias taskqueue run has completed.
Schedule devfs node destruction in the
passoninvalidate(), and release our peripheral
reference in a new routine, passdevgonecb() once
the devfs node is gone. This allows the peripheral
to fully go away, and the peripheral destructor,
passcleanup(), will get called.
MFC after: 3 days
Sponsored by: Spectra Logic
reporting. It includes:
- removing of error messages controlled by bootverbose, replacing them
with more universal and informative debugging on CAM_DEBUG_INFO level,
that is now built into the kernel by default;
- more close following to the arguments submitted by caller, such as
SF_PRINT_ALWAYS, SF_QUIET_IR and SF_NO_PRINT; consumer knows better which
errors are usual/expected at this point and which are really informative;
- adding two new flags SF_NO_RECOVERY and SF_NO_RETRY to allow caller
specify how much assistance it needs at this point; previously consumers
controlled that by not calling cam_periph_error() at all, but that made
behavior inconsistent and debugging complicated;
- tuning debug messages and taken actions order to make debugging output
more readable and cause-effect relationships visible;
- making camperiphdone() (common device recovery completion handler) to
also use cam_periph_error() in most cases, instead of own dumb code;
- removing manual sense fetching code from cam_periph_error(); I was told
by number of people that it is SIM obligation to fetch sense data, so this
code is useless and only significantly complicates recovery logic;
- making ada, da and pass driver to use cam_periph_error() with new limited
recovery options to handle error recovery and debugging in common way;
as one of results, CAM_REQUEUE_REQ and other retrying statuses are now
working fine with pass driver, that caused many problems before.
- reverting r186891 by raj@ to avoid burning few seconds in tight DELAY()
loops on device probe, while device simply loads media; I think that problem
may already be fixed in other way, and even if it is not, solution must be
different.
Sponsored by: iXsystems, Inc.
MFC after: 2 weeks
CAM_DEBUG_CDB, CAM_DEBUG_PERIPH and CAM_DEBUG_PROBE) by default.
List of these flags can be modified with CAM_DEBUG_COMPILE kernel option.
CAMDEBUG kernel option still enables all possible debug, if not overriden.
Additional 50KB of kernel size is a good price for the ability to debug
problems without rebuilding the kernel. In case where size is important,
debugging can be compiled out by setting CAM_DEBUG_COMPILE option to 0.
until transport will do some probe actions (at least soft reset).
Make ATA/SATA SIMs to not report bogus and confusing PROTO_ATA protocol.
Make ATA/SATA transport to fill that gap by reporting protocol to SIM with
XPT_SET_TRAN_SETTINGS and patching XPT_GET_TRAN_SETTINGS results if needed.
