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2011-03-18Blackfin/ipipe: fix deferred pipeline sync for the root stagePhilippe Gerum1-0/+11
This patch makes sure to sync the pipeline for the root stage only from the outer interrupt level, when resuming kernel code after an interrupt. This fixes a bug causing EVT15 to be spuriously popped off upon nested interrupts, which in turn would cause the preempted kernel code to resume without supervisor privileges. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2011-01-10Blackfin: fix building IPIPE code when XIP is enabledMike Frysinger1-2/+2
The low level assembly needs to use the pseudo_long_call helper so that we use the right call insn when doing kernel XIP. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-22Blackfin: add new cacheflush syscallSonic Zhang1-0/+1
Flushing caches sometimes requires anomaly workarounds which require supervisor-only insns. Normally we don't need to flush caches from userspace so this isn't a problem, but when gcc generates trampolines on the stack, we do. So add a new syscall for gcc to use modeled after the mips version. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-10-22Blackfin: initial preempt support while returning from interruptBarry Song1-3/+109
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-23Blackfin: wire up new fanotify/prlimit64 syscallsMike Frysinger1-0/+3
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: fix anomaly 283 handling with exact hardware errorRobin Getz1-2/+2
The exact hardware error handling code was added before the workaround for anomaly 283 which caused the anomaly to be triggered in some cases (an infinite core stall). So re-order the code to avoid this. Reported-by: Andrew Rook <andrew.rook@speakerbus.co.uk> Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: check for bad syscalls after tracing itMike Frysinger1-9/+14
We want to report all system calls (even invalid ones) to the tracing layers, so check the NR only after we've notified. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: fix single stepping over system callsMike Frysinger1-0/+2
On Blackfin systems, the hardware single step exception triggers before the system call exception, so we need to save this info to process it later on. Otherwise, single stepping in userspace misses a few insns right after the system call. This is based a bit on the SuperH code added in commit 4b505db9c4c72dbd. Reported-by: Roland McGrath <roland@redhat.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: initial tracehook supportMike Frysinger1-2/+4
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: add support for irqflags tracingYi Li1-0/+15
Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: initial XIP supportBarry Song1-8/+9
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-03-09Blackfin: wire up the various memory related syscallsMike Frysinger1-9/+9
These all just go to the stub syscall at the moment, so this is largely future proofing. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-01-05Merge branch 'master' into percpuTejun Heo1-28/+10
Conflicts: arch/powerpc/platforms/pseries/hvCall.S include/linux/percpu.h
2009-12-15Blackfin: add support for TIF_NOTIFY_RESUMEBarry Song1-1/+3
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-12-11Unify sys_mmap*Al Viro1-1/+1
New helper - sys_mmap_pgoff(); switch syscalls to using it. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-11-18Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6David S. Miller1-26/+5
Conflicts: drivers/net/sfc/sfe4001.c drivers/net/wireless/libertas/cmd.c drivers/staging/Kconfig drivers/staging/Makefile drivers/staging/rtl8187se/Kconfig drivers/staging/rtl8192e/Kconfig
2009-10-29percpu: remove per_cpu__ prefix.Rusty Russell1-2/+2
Now that the return from alloc_percpu is compatible with the address of per-cpu vars, it makes sense to hand around the address of per-cpu variables. To make this sane, we remove the per_cpu__ prefix we used created to stop people accidentally using these vars directly. Now we have sparse, we can use that (next patch). tj: * Updated to convert stuff which were missed by or added after the original patch. * Kill per_cpu_var() macro. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
2009-10-12net: Introduce recvmmsg socket syscallArnaldo Carvalho de Melo1-0/+1
Meaning receive multiple messages, reducing the number of syscalls and net stack entry/exit operations. Next patches will introduce mechanisms where protocols that want to optimize this operation will provide an unlocked_recvmsg operation. This takes into account comments made by: . Paul Moore: sock_recvmsg is called only for the first datagram, sock_recvmsg_nosec is used for the rest. . Caitlin Bestler: recvmmsg now has a struct timespec timeout, that works in the same fashion as the ppoll one. If the underlying protocol returns a datagram with MSG_OOB set, this will make recvmmsg return right away with as many datagrams (+ the OOB one) it has received so far. . Rémi Denis-Courmont & Steven Whitehouse: If we receive N < vlen datagrams and then recvmsg returns an error, recvmmsg will return the successfully received datagrams, store the error and return it in the next call. This paves the way for a subsequent optimization, sk_prot->unlocked_recvmsg, where we will be able to acquire the lock only at batch start and end, not at every underlying recvmsg call. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-07Blackfin: mass clean up of copyright/licensing infoRobin Getz1-26/+5
Bill Gatliff & David Brownell pointed out we were missing some copyrights, and licensing terms in some of the files in ./arch/blackfin, so this fixes things, and cleans them up. It also removes: - verbose GPL text(refer to the top level ./COPYING file) - file names (you are looking at the file) - bug url (it's in the ./MAINTAINERS file) - "or later" on GPL-2, when we did not have that right It also allows some Blackfin-specific assembly files to be under a BSD like license (for people to use them outside of Linux). Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-21perf: Do the big rename: Performance Counters -> Performance EventsIngo Molnar1-1/+1
Bye-bye Performance Counters, welcome Performance Events! In the past few months the perfcounters subsystem has grown out its initial role of counting hardware events, and has become (and is becoming) a much broader generic event enumeration, reporting, logging, monitoring, analysis facility. Naming its core object 'perf_counter' and naming the subsystem 'perfcounters' has become more and more of a misnomer. With pending code like hw-breakpoints support the 'counter' name is less and less appropriate. All in one, we've decided to rename the subsystem to 'performance events' and to propagate this rename through all fields, variables and API names. (in an ABI compatible fashion) The word 'event' is also a bit shorter than 'counter' - which makes it slightly more convenient to write/handle as well. Thanks goes to Stephane Eranian who first observed this misnomer and suggested a rename. User-space tooling and ABI compatibility is not affected - this patch should be function-invariant. (Also, defconfigs were not touched to keep the size down.) This patch has been generated via the following script: FILES=$(find * -type f | grep -vE 'oprofile|[^K]config') sed -i \ -e 's/PERF_EVENT_/PERF_RECORD_/g' \ -e 's/PERF_COUNTER/PERF_EVENT/g' \ -e 's/perf_counter/perf_event/g' \ -e 's/nb_counters/nb_events/g' \ -e 's/swcounter/swevent/g' \ -e 's/tpcounter_event/tp_event/g' \ $FILES for N in $(find . -name perf_counter.[ch]); do M=$(echo $N | sed 's/perf_counter/perf_event/g') mv $N $M done FILES=$(find . -name perf_event.*) sed -i \ -e 's/COUNTER_MASK/REG_MASK/g' \ -e 's/COUNTER/EVENT/g' \ -e 's/\<event\>/event_id/g' \ -e 's/counter/event/g' \ -e 's/Counter/Event/g' \ $FILES ... to keep it as correct as possible. This script can also be used by anyone who has pending perfcounters patches - it converts a Linux kernel tree over to the new naming. We tried to time this change to the point in time where the amount of pending patches is the smallest: the end of the merge window. Namespace clashes were fixed up in a preparatory patch - and some stylistic fallout will be fixed up in a subsequent patch. ( NOTE: 'counters' are still the proper terminology when we deal with hardware registers - and these sed scripts are a bit over-eager in renaming them. I've undone some of that, but in case there's something left where 'counter' would be better than 'event' we can undo that on an individual basis instead of touching an otherwise nicely automated patch. ) Suggested-by: Stephane Eranian <eranian@google.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Paul Mackerras <paulus@samba.org> Reviewed-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <linux-arch@vger.kernel.org> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-09-16Blackfin: workaround anomaly 05000283Robin Getz1-16/+2
Make sure our interrupt entry code with exact hardware errors handles anomaly 05000283 (infinite stall in system MMR kill) so we don't stall while under load. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: optimize fixed code handling for the most common caseMike Frysinger1-0/+6
The majority of the time we are returning to user space, it is not in the fixed atomic code region. So rather than branch to a function where we check the PC and return, do the check inline and branch only when needed. Also, tweak some of the fixed code handling based on assumptions we are aware of but cannot be expressed in C. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: cleanup sync handling when enabling/disabling cplbsYi Li1-10/+4
The handling of updating the [DI]MEM_CONTROL MMRs does not follow proper sync procedures as laid out in the Blackfin programming manual. So rather than audit/fix every call location, create helper functions that do the right things in order to safely update these MMRs. Then convert all call sites to use these new helper functions. While we're fixing the code, drop the workaround for anomaly 05000125 as that anomaly applies to old versions of silicon that we do not support. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: improve double fault debug handlingGraf Yang1-9/+13
Since the hardware only provides reporting for the last exception handled, and the values are valid only when executing the exception handler, we need to save the context for reporting at a later point. While we do this for one exception, it doesn't work properly when handling a second one as the original exception is clobbered by the double fault. So when double fault debugging is enabled, create a dedicated shadow of these values and save/restore out of there. Now the crash report properly displays the first exception as well as the second one. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: inline I-pipe bypass code in ret_from_exceptionPhilippe Gerum1-7/+7
Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: sanitize manual control of IPEND[4]Philippe Gerum1-14/+11
Cleanup is performed in two ways: - remove extraneous updates of IPEND[4] w/ CONFIG_IPIPE, and document remaining use. - substitute pop-reg-from-stack instructions with plain SP fixups in all save-RETI-then-discard patterns. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: use generic name for EVT14 handlerPhilippe Gerum1-4/+4
The purpose of the EVT14 handler may depend on whether CONFIG_IPIPE is enabled, albeit its implementation can be the same in both cases. When the interrupt pipeline is enabled, EVT14 can be used to raise the core priority level for the running code; when CONFIG_IPIPE is off, EVT14 can be used to lower this level before running softirq handlers. Rename evt14_softirq to evt_evt14 to pick an identifier that fits both, which allows to reuse the same vector setup code as well. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-09-16Blackfin: make EVT3->EVT5 lowering more robust wrt IPEND[4]Robin Getz1-32/+54
We handle many exceptions at EVT5 (hardware error level) so that we can catch exceptions in our exception handling code. Today - if the global interrupt enable bit (IPEND[4]) is set (interrupts disabled) our trap handling code goes into a infinite loop, since we need interrupts to be on to defer things to EVT5. Normal kernel code should not trigger this for any reason as IPEND[4] gets cleared early (when doing an interrupt context save) and the kernel stack there should be sane (or something much worse is happening in the system). But there have been a few times where this has happened, so this change makes sure we dump a proper crash message even when things have gone south. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-07-16Blackfin: cleanup code a bit with comments and definesRobin Getz1-5/+7
Improve the assembly with a few explanatory comments and use symbolic defines rather than numeric values for bit positions. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-06-22Blackfin: hook up new perf_counter_open syscallMike Frysinger1-0/+1
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-06-13Blackfin: hook up new rt_tgsigqueueinfo syscallMike Frysinger1-0/+1
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-06-13Blackfin: only handle CPLB protection violations when MPU is enabledRobin Getz1-4/+7
We don't need to handle CPLB protection violations unless we are running with the MPU on. Fix the entry code to call common trap_c, and remove the code which is never run. This allows the traps test suite to run on older boards with the MPU disabled. URL: http://blackfin.uclinux.org/gf/tracker/5129 Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-06-12Blackfin: make deferred hardware errors more exactRobin Getz1-18/+41
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>
2009-06-12Blackfin: fix link failure due to CONFIG_EXCEPTION_L1_SCRATCHGraf Yang1-17/+0
Move exception stack mess from entry.S to init.c to fix link failure when CONFIG_EXCEPTION_L1_SCRATCH is in use. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-05-27Blackfin: hook up preadv/pwritev syscallsMike Frysinger1-0/+2
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-03-04Blackfin arch: Update adeos blackfin arch patch to 1.9-00Philippe Gerum1-1/+60
Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-02-04Blackfin arch: fix 2 bugs related to debugJie Zhang1-8/+1
- unable to single step over emuexcpt instruction - gdbproxy goes into infinite loop when doing gdb does "next" over "emuexcpt" Don't decrement PC after software breakpoint. Signed-off-by: Jie Zhang <jie.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-01-07Blackfin arch: Faster C implementation of no-MPU CPLB handlerBernd Schmidt1-12/+9
This is a mixture ofcMichael McTernan's patch and the existing cplb-mpu code. We ditch the old cplb-nompu implementation, which is a good example of why a good algorithm in a HLL is preferrable to a bad algorithm written in assembly. Rather than try to construct a table of all posible CPLBs and search it, we just create a (smaller) table of memory regions and their attributes. Some of the data structures are now unified for both the mpu and nompu cases. A lot of needless complexity in cplbinit.c is removed. Further optimizations: * compile cplbmgr.c with a lot of -ffixed-reg options, and omit saving these registers on the stack when entering a CPLB exception. * lose cli/nop/nop/sti sequences for some workarounds - these don't * make sense in an exception context Additional code unification should be possible after this. [Mike Frysinger <vapier.adi@gmail.com>: - convert CPP if statements to C if statements - remove redundant statements - use a do...while loop rather than a for loop to get slightly better optimization and to avoid gcc "may be used uninitialized" warnings ... we know that the [id]cplb_nr_bounds variables will never be 0, so this is OK - the no-mpu code was the last user of MAX_MEM_SIZE and with that rewritten, we can punt it - add some BUG_ON() checks to make sure we dont overflow the small cplb_bounds array - add i/d cplb entries for the bootrom because there is functions/data in there we want to access - we do not need a NULL trailing entry as any time we access the bounds arrays, we use the nr_bounds variable ] Signed-off-by: Michael McTernan <mmcternan@airvana.com> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-11-18Blackfin arch: fix building with CONFIG_DEBUG_DOUBLEFAULTMike Frysinger1-2/+3
arch/blackfin/mach-common/entry.S:465: Error: pcrel too far BFD_RELOC_BFIN_10 Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-11-18Blackfin arch: rename irq_flags to bfin_irq_flagsMike Frysinger1-2/+2
rename irq_flags to bfin_irq_flags to avoid namespace collision with common code Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2009-01-07Blackfin arch: SMP supporting patchset: Blackfin header files and machine common codeGraf Yang1-50/+42
Blackfin dual core BF561 processor can support SMP like features. https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like In this patch, we provide SMP extend to Blackfin header files and machine common code Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-28Blackfin arch: fix bug - kernel with SMP patch can not bootupGraf Yang1-3/+4
The original code defined _exception_stack but not alloc space for the exception stack. In exception, this area is over written by exception stack. Common kernel luckly boot up, but SMP kernel stuck. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-28Blackfin arch: add an option to allow people to stick exception stack into L1 scratchMike Frysinger1-6/+15
allow people to stick exception stack into L1 scratch and make sure it gets placed into .bss sections rather than .data Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-11-18Blackfin arch: fix bug - Turn on DEBUG_DOUBLEFAULT, booting SMP kernel crashGraf Yang1-1/+1
Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-09Blackfin arch: give sys_strace proper entry markingsMike Frysinger1-0/+3
a global _sys_trace will cause the assembler to fail, it should be fixed in toolchain side firstly. Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-09Blackfin arch: Fix BUG -- BF533 + 0.5 silicon + MPU + UART PIO -> crashMichael Hennerich1-0/+18
Apply ANOMALY_05000283 & ANOMALY_05000315 Workaround also to the EXCEPTION path. Cover evt_ivhw also with ANOMALY_05000315 The Workaround needs to be prior to accesses (either read or write) to any system MMR. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-13Blackfin arch: add supporting for kgdbSonic Zhang1-2/+7
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-10-08Blackfin arch: add supporting for double fault debug handlingRobin Getz1-59/+130
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>
2008-08-27Blackfin arch: move include/asm-blackfin header files to arch/blackfinBryan Wu1-1/+1
Signed-off-by: Bryan Wu <cooloney@kernel.org>
2008-08-14Blackfin arch: hook up some missing new system callsBryan Wu1-0/+6
Signed-off-by: Bryan Wu <cooloney@kernel.org>
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