Commit graph

12 commits

Author SHA1 Message Date
Robin Getz
b9a3899d59 Blackfin: make deferred hardware errors more exact
Hardware errors on the Blackfin architecture are queued by nature of the
hardware design.  Things that could generate a hardware level queue up at
the system interface and might not process until much later, at which
point the system would send a notification back to the core.

As such, it is possible for user space code to do something that would
trigger a hardware error, but have it delay long enough for the process
context to switch.  So when the hardware error does signal, we mistakenly
evaluate it as a different process or as kernel context and panic (erp!).
This makes it pretty difficult to find the offending context.  But wait,
there is good news somewhere.

By forcing a SSYNC in the interrupt entry, we force all pending queues at
the system level to be processed and all hardware errors to be signaled.
Then we check the current interrupt state to see if the hardware error is
now signaled.  If so, we re-queue the current interrupt and return thus
allowing the higher priority hardware error interrupt to process properly.
Since we haven't done any other context processing yet, the right context
will be selected and killed.  There is still the possibility that the
exact offending instruction will be unknown, but at least we'll have a
much better idea of where to look.

The downside of course is that this causes system-wide syncs at every
interrupt point which results in significant performance degradation.
Since this situation should not occur in any properly configured system
(as hardware errors are triggered by things like bad pointers), make it a
debug configuration option and disable it by default.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-06-12 06:11:44 -04:00
Mike Frysinger
34d464f8aa Blackfin arch: use common KGDB_TESTS rather than our own KGDB_TESTCASE
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-03-02 18:14:47 +08:00
Mike Frysinger
e60cb8a9eb Blackfin arch: change HWTRACE Kconfig and set it on default
change the hwtrace description to be less confusing and default it to on
(since there shouldnt be any crashes in the miss handler code itself)

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-01-07 23:14:38 +08:00
Mike Frysinger
459249aa2d Blackfin arch: merge kgdb test code using common CONFIG_KGDB_TESTS
[Grace Pan <grace.pan@analog.com>: Add case for kgdb test in l1 and l2]

Signed-off-by: Grace Pan <grace.pan@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-01-07 23:14:39 +08:00
Robin Getz
a45d575f53 Blackfin arch: Add basic irq stack checking for Blackfin
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-01-07 23:14:38 +08:00
Robin Getz
9f06c38fb2 Blackfin arch: Add optional verbose debug
Add optional verbose debug - which when turned off, quiets down
userspace errors. Saves ~8k of code/data for production systems

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-10 18:13:21 +08:00
Sonic Zhang
0cfbb3234c Blackfin arch: early prink code still use uart core console functions to parse and set configure option string
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-09 17:39:37 +08:00
Sonic Zhang
a5ac012924 Blackfin arch: add supporting for kgdb
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-13 14:07:19 +08:00
Robin Getz
0c7a6b2135 Blackfin arch: add supporting for double fault debug handling
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-08 16:27:12 +08:00
Yi Li
7dee62ac5a Blackfin arch: Do not need this dualcore test module in kernel.
Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-07-19 20:53:46 +08:00
Mike Frysinger
cf93425d40 [Blackfin] arch: add slightly better help text for CPLB_INFO
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
2008-02-02 15:32:40 +08:00
Mike Frysinger
74ce8322bf Blackfin arch: split debug stuff off into Kconfig.debug like everyone else
Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
2007-11-21 23:50:49 +08:00