- 10 1月, 2013 1 次提交
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由 Jason Gunthorpe 提交于
The watchdog and FIT code has been #if 0'd for ever, if the CPU takes an exception to either of those vectors it will jump into the middle of the PIT or Data TLB code and surely crash. At least some (all?) 405 cores have both the WDT and FIT vectors defined, so lets have proper entry points for them. Tested that the WDT vector works on a 405F6 core. Signed-off-by: NJason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 05 9月, 2012 2 次提交
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由 Anton Blanchard 提交于
When we update the DSCR either via emulation of mtspr(DSCR) or via a change to dscr_default in sysfs we don't update thread.dscr. We will eventually update it at context switch time but there is a period where thread.dscr is incorrect. If we fork at this point we will copy the old value of thread.dscr into the child. To avoid this, always keep thread.dscr in sync with reality. This issue was found with the following testcase: http://ozlabs.org/~anton/junkcode/dscr_inherit_test.cSigned-off-by: NAnton Blanchard <anton@samba.org> Cc: <stable@kernel.org> # 3.0+ Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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Add thread_struct.trap_nr and use it to store the last exception the thread experienced. In this patch, we populate the field at various places where we force_sig_info() to the process. This is also used in uprobes to determine if the probed instruction caused an exception. Signed-off-by: NAnanth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 09 5月, 2012 1 次提交
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由 Benjamin Herrenschmidt 提交于
Alignment was the last user of the ENABLE_INTS macro, which we can now remove. All non-syscall exceptions now disable interrupts on entry, they get re-enabled conditionally from C code. Don't unconditionally re-enable in program check either, check the original context. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 29 3月, 2012 1 次提交
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由 David Howells 提交于
Disintegrate asm/system.h for PowerPC. Signed-off-by: NDavid Howells <dhowells@redhat.com> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> cc: linuxppc-dev@lists.ozlabs.org
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- 09 3月, 2012 1 次提交
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由 Benjamin Herrenschmidt 提交于
If we get a floating point, altivec or vsx unavaible interrupt in kernel, we trigger a kernel error. There is no point preserving the interrupt state, in fact, that can even make debugging harder as the processor state might change (we may even preempt) between taking the exception and landing in a debugger. So just make those 3 disable interrupts unconditionally. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> --- v2: On BookE only disable when hitting the kernel unavailable path, otherwise it will fail to restore softe as fast_exception_return doesn't do it.
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- 23 2月, 2012 1 次提交
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由 Mahesh Salgaonkar 提交于
When registered for firmware assisted dump on powerpc, firmware preserves the registers for the active CPUs during a system crash. This patch reads the cpu register data stored in Firmware-assisted dump format (except for crashing cpu) and converts it into elf notes and updates the PT_NOTE program header accordingly. The exact register state for crashing cpu is saved to fadump crash info structure in scratch area during crash_fadump() and read during second kernel boot. Signed-off-by: NMahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 08 12月, 2011 3 次提交
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由 Anton Blanchard 提交于
Our die() code was based off a very old x86 version. Update it to mirror the current x86 code. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Anton Blanchard 提交于
We have a lot of complicated logic that handles possible recursion between kdump and a system reset exception. We can solve this in a much simpler way using the same setjmp/longjmp tricks xmon does. As a first step, this patch removes the old system reset code. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Anton Blanchard 提交于
I've been seeing truncated output when people send system reset info to me. We should see a backtrace for every CPU, but the panic() code takes the box down before they all make it out to the console. The panic code runs unlocked so we also see corrupted console output. If we are going to panic, then delay 1 second before calling into the panic code. Move oops_exit inside the die lock and put a newline between oopses for clarity. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 17 11月, 2011 1 次提交
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由 Kumar Gala 提交于
All of DebugException is already protected by CONFIG_PPC_ADV_DEBUG_REGS there is no need to have another such ifdef inside the function. Signed-off-by: NKumar Gala <galak@kernel.crashing.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 07 10月, 2011 1 次提交
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由 Kumar Gala 提交于
If the L1 D-Cache is in write shadow mode the HW will auto-recover the error. However we might still log the error and cause a machine check (if L1CSR0[CPE] - Cache error checking enable). We should only treat the non-write shadow case as non-recoverable. Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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- 12 7月, 2011 1 次提交
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由 yu liu 提交于
giveup_spe() saves the SPE state which is protected by MSR[SPE]. However, modifying SPEFSCR does not trap when MSR[SPE]=0. And since SPEFSCR is already saved/restored in _switch(), not all the callers want to save SPEFSCR again. Thus, saving SPEFSCR should not belong to giveup_spe(). This patch moves SPEFSCR saving to flush_spe_to_thread(), and cleans up the caller that needs to save SPEFSCR accordingly. Signed-off-by: NLiu Yu <yu.liu@freescale.com> Acked-by: NKumar Gala <galak@kernel.crashing.org> Signed-off-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NAlexander Graf <agraf@suse.de>
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- 29 6月, 2011 1 次提交
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由 Christian Dietrich 提交于
Since printk_ratelimit() shouldn't be used anymore (see comment in include/linux/printk.h), replace it with printk_ratelimited. Signed-off-by: NChristian Dietrich <christian.dietrich@informatik.uni-erlangen.de> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 22 6月, 2011 1 次提交
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由 Scott Wood 提交于
The wrong MCSR bit was being used on e500mc. MCSR_BUS_RBERR only exists on e500v1/v2. Use MCSR_LD on e500mc, and remove all MCSR checking in fsl_rio_mcheck_exception as we now no longer call that function if the appropriate bit in MCSR is not set. If RIO support was enabled at compile-time, but was never probed, just return from fsl_rio_mcheck_exception rather than dereference a NULL pointer. TODO: There is still a remaining, though comparitively minor, issue in that this recovery mechanism will falsely engage if there's an unrelated MCSR_LD event at the same time as a RIO error. Signed-off-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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- 20 5月, 2011 1 次提交
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由 Shaohui Xie 提交于
Add support for machine_check support into machine_check_e500 and machine_check_e500mc. Signed-off-by: NShaohui Xie <b21989@freescale.com> Cc: Li Yang <leoli@freescale.com> Cc: Roy Zang <tie-fei.zang@freescale.com> Cc: Alexandre Bounine <alexandre.bounine@idt.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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- 14 5月, 2011 1 次提交
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由 Greg Kroah-Hartman 提交于
On some arches (x86, sh, arm, unicore, powerpc) the oops message would print out the last sysfs file accessed. This was very useful in finding a number of sysfs and driver core bugs in the 2.5 and early 2.6 development days, but it has been a number of years since this file has actually helped in debugging anything that couldn't also be trivially determined from the stack traceback. So it's time to delete the line. This is good as we need all the space we can get for oops messages at times on consoles. Acked-by: NPhil Carmody <ext-phil.2.carmody@nokia.com> Acked-by: NIngo Molnar <mingo@elte.hu> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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- 04 5月, 2011 1 次提交
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由 KOSAKI Motohiro 提交于
Adapt new API. Almost change is trivial. Most important change is the below line because we plan to change task->cpus_allowed implementation. - ctx->cpus_allowed = current->cpus_allowed; Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 27 4月, 2011 2 次提交
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由 Michael Ellerman 提交于
Use the new MSR_64BIT in a few places. Some of these are already ifdef'ed for BOOKE vs BOOKS, but it's still clearer, MSR_SF does not immediately parse as "MSR bit for 64bit". Signed-off-by: NMichael Ellerman <michael@ellerman.id.au> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Alexey Kardashevskiy 提交于
The DSCR (aka Data Stream Control Register) is supported on some server PowerPC chips and allow some control over the prefetch of data streams. This patch allows the value to be specified per thread by emulating the corresponding mfspr and mtspr instructions. Children of such threads inherit the value. Other threads use a default value that can be specified in sysfs - /sys/devices/system/cpu/dscr_default. If a thread starts with non default value in the sysfs entry, all children threads inherit this non default value even if the sysfs value is changed later. Signed-off-by: NAlexey Kardashevskiy <aik@au1.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 31 3月, 2011 1 次提交
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由 Lucas De Marchi 提交于
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: NLucas De Marchi <lucas.demarchi@profusion.mobi>
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- 21 1月, 2011 3 次提交
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由 Anton Blanchard 提交于
If a machine check comes from userspace we send a SIGBUS to the task and fail to printk anything. If we are taking machine checks due to bad hardware we want to know about it right away. Furthermore if we don't complain loudly then it will look a lot like a bug in the userspace application, potentially causing a lot of confusion. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Anton Blanchard 提交于
We are calling debugger_fault_handler twice in machine_check_exception. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Anton Blanchard 提交于
We should never force MSR_RI on. If we take a machine check with MSR_RI off then we have no chance of recovering safely. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 14 10月, 2010 1 次提交
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由 Kumar Gala 提交于
The new e5500 core is similar to the e500mc core but adds 64-bit support. We support running it in 32-bit mode as it is identical to the e500mc. Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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- 09 7月, 2010 1 次提交
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由 Benjamin Herrenschmidt 提交于
... where it belongs Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 22 6月, 2010 1 次提交
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由 K.Prasad 提交于
If an alignment interrupt occurs on an instruction that is being single-stepped, the alignment interrupt handler currently handles the single-step condition by unconditionally sending a SIGTRAP to the process. Other synchronous interrupts that result in the instruction being emulated do likewise. With hw_breakpoint support, the hw_breakpoint code needs to be able to intercept these single-step events as well as those where the instruction executes normally and a trace interrupt happens. Fix this by making emulate_single_step() use the existing single_step_exception() function instead of calling _exception() directly. We then make single_step_exception() use the abstracted clear_single_step() rather than clearing bits in the MSR image directly so that emulate_single_step() will continue to work correctly on Book 3E processors. Signed-off-by: NK.Prasad <prasad@linux.vnet.ibm.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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- 21 5月, 2010 2 次提交
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由 Scott Wood 提交于
Most of the MSCR bit assigments are different in e500mc versus e500, and they are now write-one-to-clear. Some e500mc machine check conditions are made recoverable (as long as they aren't stuck on), most notably L1 instruction cache parity errors. Signed-off-by: NScott Wood <scottwood@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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由 Jason Wessel 提交于
The only way the debugger can handle a trap in inside rcu_lock, notify_die, or atomic_notifier_call_chain without a recursive fault is to allow the kernel debugger to handle the exception first in program_check_exception(). The other change here is to make sure that kgdb_handle_exception() is called with correct parameters when catching an oops, because kdb needs to know if the entry was an oops, single step, or breakpoint exception. [benh@kernel.crashing.org: move debugger_bpt instead of #ifdef] CC: Paul Mackerras <paulus@samba.org> Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 05 5月, 2010 1 次提交
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由 Dave Kleikamp 提交于
The 47x core's MCSR varies from 44x, so it needs it's own machine check handler. Signed-off-by: NDave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: NJosh Boyer <jwboyer@linux.vnet.ibm.com>
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- 30 3月, 2010 1 次提交
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由 Tejun Heo 提交于
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: NTejun Heo <tj@kernel.org> Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
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- 19 2月, 2010 1 次提交
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由 Thomas Gleixner 提交于
die.lock needs to be a real spinlock in RT. Convert it to raw_spinlock. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 17 2月, 2010 3 次提交
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由 Dave Kleikamp 提交于
powerpc/booke: Add support for advanced debug registers From: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Based on patches originally written by Torez Smith. This patch defines context switch and trap related functionality for BookE specific Debug Registers. It adds support to ptrace() for setting and getting BookE related Debug Registers Signed-off-by: NDave Kleikamp <shaggy@linux.vnet.ibm.com> Cc: Torez Smith <lnxtorez@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Gibson <dwg@au1.ibm.com> Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: Sergio Durigan Junior <sergiodj@br.ibm.com> Cc: Thiago Jung Bauermann <bauerman@br.ibm.com> Cc: linuxppc-dev list <Linuxppc-dev@ozlabs.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Dave Kleikamp 提交于
powerpc/booke: Introduce new CONFIG options for advanced debug registers From: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Introduce new config options to simplify the ifdefs pertaining to the advanced debug registers for booke and 40x processors: CONFIG_PPC_ADV_DEBUG_REGS - boolean: true for dac-based processors CONFIG_PPC_ADV_DEBUG_IACS - number of IAC registers CONFIG_PPC_ADV_DEBUG_DACS - number of DAC registers CONFIG_PPC_ADV_DEBUG_DVCS - number of DVC registers CONFIG_PPC_ADV_DEBUG_DAC_RANGE - DAC ranges supported Beginning conservatively, since I only have the facilities to test 440 hardware. I believe all 40x and booke platforms support at least 2 IAC and 2 DAC registers. For 440, 4 IAC and 2 DVC registers are enabled, as well as the DAC ranges. Signed-off-by: NDave Kleikamp <shaggy@linux.vnet.ibm.com> Acked-by: NDavid Gibson <dwg@au1.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Anton Blanchard 提交于
With NO_HZ it is useful to know how often the decrementer is going off. The patch below adds an entry for it and also adds it into the /proc/stat summaries. While here, I added performance monitoring and machine check exceptions. I found it useful to keep an eye on the PMU exception rate when using the perf tool. Since it's possible to take a completely handled machine check on a System p box it also sounds like a good idea to keep a machine check summary. The event naming matches x86 to keep gratuitous differences to a minimum. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 09 2月, 2010 1 次提交
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由 Anton Blanchard 提交于
Add printout of last accessed sysfs file, added to x86 in ae87221d (sysfs: crash debugging) Also add the notify_die hook that allows us to print out the ftrace buffer on oops. This is useful in conjunction with ftrace function_graph: Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=128 NUMA pSeries last sysfs file: /sys/class/net/tunl0/type Dumping ftrace buffer: ... 0) | .sysrq_handle_crash() { 0) 0.476 us | .hash_page(); 0) 0.488 us | .xmon_fault_handler(); 0) | .bad_page_fault() { 0) | .search_exception_tables() { 0) 0.590 us | .search_module_extables(); 0) 2.546 us | } 0) | .printk() { 0) | .vprintk() { 0) 0.488 us | ._raw_spin_lock(); 0) 0.572 us | .emit_log_char(); Showing the function graph of a sysrq-c crash. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 03 2月, 2010 1 次提交
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由 Anton Blanchard 提交于
Using perf to trace L1 dcache misses and dumping data addresses I found a few variables taking a lot of misses. Since they are almost never written, they should go into the __read_mostly section. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 16 12月, 2009 1 次提交
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由 Oleg Nesterov 提交于
Suggested by Roland. Implement user_single_step_siginfo() for powerpc. Signed-off-by: NOleg Nesterov <oleg@redhat.com> Acked-by: NRoland McGrath <roland@redhat.com> Cc: <linux-arch@vger.kernel.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 24 11月, 2009 1 次提交
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由 Benjamin Herrenschmidt 提交于
The code under "if (is_global_init())" is bogus, and is_global_init() itself is not right in mt case. Contrary to what the comment says, nowadays force_sig_info() does kill init even if the handler is SIG_DFL. Note that force_sig_info() clears SIGNAL_UNKILLABLE exactly for this case. Signed-off-by: NOleg Nesterov <oleg@redhat.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 28 10月, 2009 1 次提交
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由 Anton Blanchard 提交于
perf_event wants a separate event for alignment and emulation faults, so create another emulation event. This will make it easy to hook in perf_event at one spot. We pass in regs which will be required for these events. Signed-off-by: NAnton Blanchard <anton@samba.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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