- 25 11月, 2011 16 次提交
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由 Ravi K. Nittala 提交于
The RTAS firmware flash update is conducted using an RTAS call that is serialized by lock_rtas() which uses spin_lock. While the flash is in progress, rtasd performs scan for any RTAS events that are generated by the system. rtasd keeps scanning for the RTAS events generated on the machine. This is performed via workqueue mechanism. The rtas_event_scan() also uses an RTAS call to scan the events, eventually trying to acquire the spin_lock before issuing the request. The flash update takes a while to complete and during this time, any other RTAS call has to wait. In this case, rtas_event_scan() waits for a long time on the spin_lock resulting in a soft lockup. Fix: Just before the flash update is performed, the queued rtas_event_scan() work item is cancelled from the work queue so that there is no other RTAS call issued while the flash is in progress. After the flash completes, the system reboots and the rtas_event_scan() is rescheduled. Signed-off-by: NSuzuki Poulose <suzuki@in.ibm.com> Signed-off-by: NRavi Nittala <ravi.nittala@in.ibm.com> Reported-by: NDivya Vikas <divya.vikas@in.ibm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Jimi Xenidis 提交于
This patch add the Chroma platform to WSP/PowerEN, which is a PCIe card (a defconfig is included). The card includes an H8 service processor that is used to manage the card. The H8 is connected over the second serial UART on the PowerEN chip so this patch includes a simple 16550 driver to enable communication, mostly for "power off" and "rebooting". This patch also includes a, WSP specific, "halt" method that will shut of all A2 cores but still leave power on at the chip level. This is desirable, especially if you wish to interrogate the chip with a hardware probe after the halt. Signed-off-by: NJimi Xenidis <jimix@pobox.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Jimi Xenidis 提交于
Sorry, there was a typo in the #if signed-off-by: NJimi Xenidis <jimix@pobox.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Jimi Xenidis 提交于
The 'u' command will print the TLB on book3e parts and the SLB on Book3s parts, but the help system doesn't say that correctly. Signed-off-by: NJimi Xenidis <jimix@pobox.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Jimi Xenidis 提交于
This patch adds a fault handler that responds to illegal Coprocessor types. Currently all CTs are treated and illegal. There are two ways to report the fault back to the application. If the application used the record form ("icswx.") then the architected "reject" is emulated. If the application did not used the record form ("icswx") then it is selectable by config whether the failure is silent (as architected) or a SIGILL is generated. In all cases pr_warn() is used to log the bad CT. Signed-off-by: NJimi Xenidis <jimix@pobox.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Jimi Xenidis 提交于
ICSWX is also used by the A2 processor to access coprocessors, although not all "chips" that contain A2s have coprocessors. Signed-off-by: NJimi Xenidis <jimix@pobox.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Jimi Xenidis 提交于
Some processors, like embedded, that already have a PID register that is managed by the system. This patch separates the ACOP and PID processing into separate files so that the ACOP code can be shared. Signed-off-by: NJimi Xenidis <jimix@pobox.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Julia Lawall 提交于
np is initialized to the result of calling a function that calls of_node_get, so of_node_put should be called before the pointer is dropped. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression e,e1,e2; @@ * e = \(of_find_node_by_type\|of_find_node_by_name\)(...) ... when != of_node_put(e) when != true e == NULL when != e2 = e e = e1 // </smpl> Signed-off-by: NJulia Lawall <julia@diku.dk> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Julia Lawall 提交于
np is initialized to the result of calling a function that calls of_node_get, so of_node_put should be called before the pointer is dropped. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression e,e1,e2; @@ * e = \(of_find_node_by_type\|of_find_node_by_name\)(...) ... when != of_node_put(e) when != true e == NULL when != e2 = e e = e1 // </smpl> Signed-off-by: NJulia Lawall <julia@diku.dk> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Milton Miller 提交于
Some pseries IOMMUs cache TCEs but don't snoop when the TCEs are changed in memory, hence we need manually invalidate in software. This adds code to do the invalidate. It keys off a device tree property to say where the to do the MMIO for the invalidate and some information on what the format of the invalidate including some magic routing info. it_busno get overloaded with this magic routing info and it_index with the MMIO address for the invalidate command. This then gets hooked into the building and freeing of TCEs. This is only useful on bare metal pseries. pHyp takes care of this when virtualised. Based on patch from Milton with cleanups from Mikey. Signed-off-by: NMilton Miller <miltonm@bga.com> Signed-off-by: NMichael Neuling <mikey@neuling.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Anton Blanchard 提交于
decrementer_check_overflow is called from arch_local_irq_restore so we want to make it as light weight as possible. As such, turn decrementer_check_overflow into an inline function. To avoid a circular mess of includes, separate out the two components of struct decrementer_clock and keep the struct clock_event_device part local to time.c. The fast path improves from: arch_local_irq_restore 0: mflr r0 4: std r0,16(r1) 8: stdu r1,-112(r1) c: stb r3,578(r13) 10: cmpdi cr7,r3,0 14: beq- cr7,24 <.arch_local_irq_restore+0x24> ... 24: addi r1,r1,112 28: ld r0,16(r1) 2c: mtlr r0 30: blr to: arch_local_irq_restore 0: std r30,-16(r1) 4: ld r30,0(r2) 8: stb r3,578(r13) c: cmpdi cr7,r3,0 10: beq- cr7,6c <.arch_local_irq_restore+0x6c> ... 6c: ld r30,-16(r1) 70: blr Unfortunately we still setup a local TOC (due to -mminimal-toc). Yet another sign we should be moving to -mcmodel=medium. 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
Fix some formatting issues and use the DECREMENTER_MAX define instead of 0x7fffffff. 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
The clockevents code uses max_delta_ns to avoid calling a clockevent with too large a value. Remove the redundant version of this in the timer_interrupt 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
Use clocksource_register_hz which calculates the shift/mult factors for us. Also remove the shift = 22 assumption in vsyscall_update - thanks to Paul Mackerras and John Stultz for catching that. 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 can use clockevents_calc_mult_shift instead of doing all the work ourselves. 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
When re-enabling interrupts we have code to handle edge sensitive decrementers by resetting the decrementer to 1 whenever it is negative. If interrupts were disabled long enough that the decrementer wrapped to positive we do nothing. This means interrupts can be delayed for a long time until it finally goes negative again. While we hope interrupts are never be disabled long enough for the decrementer to go positive, we have a very good test team that can drive any kernel into the ground. The softlockup data we get back from these fails could be seconds in the future, completely missing the cause of the lockup. We already keep track of the timebase of the next event so use that to work out if we should trigger a decrementer exception. Signed-off-by: NAnton Blanchard <anton@samba.org> Cc: stable@kernel.org Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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- 22 11月, 2011 2 次提交
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由 Al Viro 提交于
altroot support has been gone for years, along with arch/*/asm/namei.h; looks like a dummy survivor that sat it out in microblaze tree... Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
wrong register returned... Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 20 11月, 2011 1 次提交
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由 Avi Kivity 提交于
Prevent tracing of preempt_disable() in get_cpu_var() in kvm_clock_read(). When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are traced and this causes the function_graph tracer to go into an infinite recursion. By open coding the preempt_disable() around the get_cpu_var(), we can use the notrace version which prevents preempt_disable/enable() from being traced and prevents the recursion. Based on a similar patch for Xen from Jeremy Fitzhardinge. Tested-by: NGleb Natapov <gleb@redhat.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> Signed-off-by: NAvi Kivity <avi@redhat.com>
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- 18 11月, 2011 4 次提交
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由 David S. Miller 提交于
Some of the sun4v code patching occurs in inline functions visible to, and usable by, modules. Therefore we have to patch them up during module load. Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 David S. Miller 提交于
To handle the large physical addresses, just make a simple wrapper around remap_pfn_range() like MIPS does. Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Rafael J. Wysocki 提交于
Fix build regression introduced by commit 056879d2 (ARM: mach-shmobile: sh7372 A3SP no_suspend_console fix) by moving the intialization of the A3SP domain to a separate function and providing an empty definition of it for CONFIG_PM unset. Reported-and-tested-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
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由 Russell King 提交于
These two syscalls were introduced during the last merge window. Add the entries into the ARM call tables for them. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 17 11月, 2011 16 次提交
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由 Alexander Graf 提交于
This reverts commit a15bd354. It exceeded the padding on the SREGS struct, rendering the ABI backwards-incompatible. Conflicts: arch/powerpc/kvm/powerpc.c include/linux/kvm.h Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Gleb Natapov 提交于
Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Gleb Natapov 提交于
Support guest/host-only profiling by switch perf msrs on a guest entry if needed. Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Gleb Natapov 提交于
Some cpus have special support for switching PERF_GLOBAL_CTRL msr. Add logic to detect if such support exists and works properly and extend msr switching code to use it if available. Also extend number of generic msr switching entries to 8. Signed-off-by: NGleb Natapov <gleb@redhat.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Christian Borntraeger 提交于
KVM on s390 always had a sync mmu. Any mapping change in userspace mapping was always reflected immediately in the guest mapping. - In older code the guest mapping was just an offset - In newer code the last level page table is shared Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCarsten Otte <cotte@de.ibm.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Christian Borntraeger 提交于
There is a potential host deadlock in the tprot intercept handling. We must not hold the mmap semaphore while resolving the guest address. If userspace is remapping, then the memory detection in the guest is broken anyway so we can safely separate the address translation from walking the vmas. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NCarsten Otte <cotte@de.ibm.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Cornelia Huck 提交于
SIGP sense running may cause an intercept on higher level virtualization, so handle it by checking the CPUSTAT_RUNNING flag. Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NCarsten Otte <cotte@de.ibm.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Cornelia Huck 提交于
CPUSTAT_RUNNING was implemented signifying that a vcpu is not stopped. This is not, however, what the architecture says: RUNNING should be set when the host is acting on the behalf of the guest operating system. CPUSTAT_RUNNING has been changed to be set in kvm_arch_vcpu_load() and to be unset in kvm_arch_vcpu_put(). For signifying stopped state of a vcpu, a host-controlled bit has been used and is set/unset basically on the reverse as the old CPUSTAT_RUNNING bit (including pushing it down into stop handling proper in handle_stop()). Cc: stable@kernel.org Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: NCarsten Otte <cotte@de.ibm.com> Signed-off-by: NAvi Kivity <avi@redhat.com>
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由 Will Deacon 提交于
On PPC64, put_sigset_t converts a sigset_t to a compat_sigset_t before copying it to userspace. There is a typo in the case that we have 4 words to copy, meaning that we corrupt the compat_sigset_t. It appears that _NSIG_WORDS can't be greater than 2 at the moment so this code is probably always optimised away anyway. Signed-off-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Benjamin Herrenschmidt 提交于
The Documentation/memory-barriers.txt document requires that atomic operations that return a value act as a memory barrier both before and after the actual atomic operation. Our current implementation doesn't guarantee this. More specifically, while a load following the isync can not be issued before stwcx. has completed, that completion doesn't architecturally means that the result of stwcx. is visible to other processors (or any previous stores for that matter) (typically, the other processors L1 caches can still hold the old value). This has caused an actual crash in RCU torture testing on Power 7 This fixes it by changing those atomic ops to use new macros instead of RELEASE/ACQUIRE barriers, called ATOMIC_ENTRY and ATMOIC_EXIT barriers, which are then defined respectively to lwsync and sync. I haven't had a chance to measure the performance impact (or rather what I measured with kernel compiles is in the noise, I yet have to find a more precise benchmark) Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
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由 Kyle Moffett 提交于
Recent binutils refuses to assemble AltiVec opcodes when in e500/SPE mode, as some of those opcodes alias the "SPE" instructions. This triggers an ancient binutils version check even when building a kernel with CONFIG_ALTIVEC disabled. In theory, the check could be conditionalized on CONFIG_ALTIVEC, but in practice it has long outlived its utility. It is virtually impossible to find binutils older than 2.12.1 (released 2002) in the wild anymore. Even ancient RedHat Enterprise Linux 4 has binutils-2.14. To fix the kernel build when done natively on e500 systems with this new binutils, the test is simply removed. Signed-off-by: NKyle Moffett <Kyle.D.Moffett@boeing.com> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Kumar Gala 提交于
With the introduction of CONFIG_PPC_ADV_DEBUG_REGS user space debug is broken on Book-E 64-bit parts that support delayed debug events. When switch_booke_debug_regs() sets DBCR0 we'll start getting debug events as MSR_DE is also set and we aren't able to handle debug events from kernel space. We can remove the hack that always enables MSR_DE and loads up DBCR0 and just utilize switch_booke_debug_regs() to get user space debug working again. We still need to handle critical/debug exception stacks & proper save/restore of state for those exception levles to support debug events from kernel space like we have on 32-bit. Signed-off-by: NKumar Gala <galak@kernel.crashing.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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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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由 Kumar Gala 提交于
We had an existing ifdef for 4xx & BOOKE processors that got changed to CONFIG_PPC_ADV_DEBUG_REGS. The define has nothing to do with CONFIG_PPC_ADV_DEBUG_REGS. The define really should be: #if defined(CONFIG_4xx) || defined(CONFIG_BOOKE) and not #ifdef CONFIG_PPC_ADV_DEBUG_REGS Signed-off-by: NKumar Gala <galak@kernel.crashing.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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由 Zhenzhong Duan 提交于
PVHVM running with more than 32 vcpus and pv_irq/pv_time enabled need VCPU placement to work, or else it will softlockup. CC: stable@kernel.org Acked-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: NZhenzhong Duan <zhenzhong.duan@oracle.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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由 David Vrabel 提交于
When mapping a foreign page with xenbus_map_ring_valloc() with the GNTTABOP_map_grant_ref hypercall, set the GNTMAP_contains_pte flag and pass a pointer to the PTE (in init_mm). After the page is mapped, the usual fault mechanism can be used to update additional MMs. This allows the vmalloc_sync_all() to be removed from alloc_vm_area(). Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com> Acked-by: NAndrew Morton <akpm@linux-foundation.org> [v1: Squashed fix by Michal for no-mmu case] Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: NMichal Simek <monstr@monstr.eu>
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- 16 11月, 2011 1 次提交
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由 Geoff Levand 提交于
Move the PS3 IPI message setup from ps3_smp_setup_cpu() to ps3_smp_probe(). Fixes startup warnings like these: ------------[ cut here ]------------ WARNING: at kernel/lockdep.c:2649 Modules linked in: ... ---[ end trace 31fd0ba7d8756001 ]--- Signed-off-by: NGeoff Levand <geoff@infradead.org> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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