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* powerpc/xmon: don't access ASDR in VMsSukadev Bhattiprolu2020-02-141-5/+4
| | | | | | | | | | | | | | | | commit c2a20711fc181e7f22ee5c16c28cb9578af84729 upstream. ASDR is HV-privileged and must only be accessed in HV-mode. Fixes a Program Check (0x700) when xmon in a VM dumps SPRs. Fixes: d1e1b351f50f ("powerpc/xmon: Add ISA v3.0 SPRs to SPR dump") Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com> Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200107021633.GB29843@us.ibm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/xmon: fix dump_segments()Christophe Leroy2019-12-051-1/+1
| | | | | | | | | | | [ Upstream commit 32c8c4c621897199e690760c2d57054f8b84b6e6 ] mfsrin() takes segment num from bits 31-28 (IBM bits 0-3). Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Clarify bit numbering] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
* powerpc/xmon: Check for HV mode when dumping XIVE info from OPALCédric Le Goater2019-10-071-6/+9
| | | | | | | | | | | | | | | [ Upstream commit c3e0dbd7f780a58c4695f1cd8fc8afde80376737 ] Currently, the xmon 'dx' command calls OPAL to dump the XIVE state in the OPAL logs and also outputs some of the fields of the internal XIVE structures in Linux. The OPAL calls can only be done on baremetal (PowerNV) and they crash a pseries machine. Fix by checking the hypervisor feature of the CPU. Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190814154754.23682-2-clg@kaod.org Signed-off-by: Sasha Levin <sashal@kernel.org>
* powerpc/xmon: Fix disabling tracing while in xmonNaveen N. Rao2019-07-311-2/+4
| | | | | | | | | | | | | | | | | | | | [ Upstream commit aaf06665f7ea3ee9f9754e16c1a507a89f1de5b1 ] Commit ed49f7fd6438d ("powerpc/xmon: Disable tracing when entering xmon") added code to disable recording trace entries while in xmon. The commit introduced a variable 'tracing_enabled' to record if tracing was enabled on xmon entry, and used this to conditionally enable tracing during exit from xmon. However, we are not checking the value of 'fromipi' variable in xmon_core() when setting 'tracing_enabled'. Due to this, when secondary cpus enter xmon, they will see tracing as being disabled already and tracing won't be re-enabled on exit. Fix the same. Fixes: ed49f7fd6438d ("powerpc/xmon: Disable tracing when entering xmon") Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
* powerpc/xmon: Fix invocation inside lock regionBreno Leitao2019-01-261-4/+14
| | | | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit 8d4a862276a9c30a269d368d324fb56529e6d5fd ] Currently xmon needs to get devtree_lock (through rtas_token()) during its invocation (at crash time). If there is a crash while devtree_lock is being held, then xmon tries to get the lock but spins forever and never get into the interactive debugger, as in the following case: int *ptr = NULL; raw_spin_lock_irqsave(&devtree_lock, flags); *ptr = 0xdeadbeef; This patch avoids calling rtas_token(), thus trying to get the same lock, at crash time. This new mechanism proposes getting the token at initialization time (xmon_init()) and just consuming it at crash time. This would allow xmon to be possible invoked independent of devtree_lock being held or not. Signed-off-by: Breno Leitao <leitao@debian.org> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
* powerpc/64s: Improve RFI L1-D cache flush fallbackNicholas Piggin2018-05-301-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | commit bdcb1aefc5b3f7d0f1dc8b02673602bca2ff7a4b upstream. The fallback RFI flush is used when firmware does not provide a way to flush the cache. It's a "displacement flush" that evicts useful data by displacing it with an uninteresting buffer. The flush has to take care to work with implementation specific cache replacment policies, so the recipe has been in flux. The initial slow but conservative approach is to touch all lines of a congruence class, with dependencies between each load. It has since been determined that a linear pattern of loads without dependencies is sufficient, and is significantly faster. Measuring the speed of a null syscall with RFI fallback flush enabled gives the relative improvement: P8 - 1.83x P9 - 1.75x The flush also becomes simpler and more adaptable to different cache geometries. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/xmon: Avoid tripping SMP hardlockup watchdogNicholas Piggin2017-12-251-4/+13
| | | | | | | | | | | | | | | | [ Upstream commit 064996d62a33ffe10264b5af5dca92d54f60f806 ] The SMP hardlockup watchdog cross-checks other CPUs for lockups, which causes xmon headaches because it's assuming interrupts hard disabled means no watchdog troubles. Try to improve that by calling touch_nmi_watchdog() in obvious places where secondaries are spinning. Also annotate these spin loops with spin_begin/end calls. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/xmon: Check before calling xive functionsBreno Leitao2017-12-201-0/+5
| | | | | | | | | | | | | | | | | | | | | | | [ Upstream commit 402e172a2ce76210f2fe921cf419d12103851344 ] Currently xmon could call XIVE functions from OPAL even if the XIVE is disabled or does not exist in the system, as in POWER8 machines. This causes the following exception: 1:mon> dx cpu 0x1: Vector: 700 (Program Check) at [c000000423c93450] pc: c00000000009cfa4: opal_xive_dump+0x50/0x68 lr: c0000000000997b8: opal_return+0x0/0x50 This patch simply checks if XIVE is enabled before calling XIVE functions. Fixes: 243e25112d06 ("powerpc/xive: Native exploitation of the XIVE interrupt controller") Suggested-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Signed-off-by: Breno Leitao <leitao@debian.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* powerpc/xmon: Add ISA v3.0 SPRs to SPR dumpBalbir Singh2017-08-311-0/+23
| | | | | | | | | | | | Add support for printing the PIDR/TIDR for ISA 300 and PSSCR and PTCR in ISA 3.0 hypervisor mode. SPRN_PSSCR_PR is the privileged mode access and is used when we are not in hypervisor mode. Signed-off-by: Balbir Singh <bsingharora@gmail.com> [mpe: Split out of larger patch] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Add AMR, UAMOR, AMOR, IAMR to SPR dumpBalbir Singh2017-08-311-4/+7
| | | | | | | | | This patch adds support to xmon for dumping the AMR, UAMOR, AMOR and IAMR SPRs based on their supported ISA revisions. Signed-off-by: Balbir Singh <bsingharora@gmail.com> [mpe: Split out of larger patch] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Dump all 64 bits of HDECBalbir Singh2017-08-311-1/+1
| | | | | | | | ISA 3.0 defines hypervisor decrementer to be 64 bits in length. This patch extends the print format for to be 64 bits. Signed-off-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Fix display of SPRsBalbir Singh2017-08-311-16/+16
| | | | | | | | | Convert 0.16x to 0.16lx. Otherwise we lose the top 8 nibbles and effectively print only the last 32 bits. Fixes: 1846193b178d ("powerpc/xmon: Dump ISA 2.06 SPRs") Signed-off-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Disable tracing when entering xmonBreno Leitao2017-08-141-2/+6
| | | | | | | | | | | | | If tracing is enabled and you get into xmon, the tracing buffer continues to be updated, causing possible loss of data and unnecessary tracing information coming from xmon functions. This patch simple disables tracing when entering xmon, and re-enables it if the kernel is resumed (with 'x'). Signed-off-by: Breno Leitao <leitao@debian.org> Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Dump ftrace buffers for the current CPU onlyBreno Leitao2017-08-141-3/+19
| | | | | | | | | | | | | Current xmon 'dt' command dumps the tracing buffer for all the CPUs, which makes it very hard to read due to the fact that most of powerpc machines currently have many CPUs. Other than that, the CPU lines are interleaved in the ftrace log. This new option just dumps the ftrace buffer for the current CPU. Signed-off-by: Breno Leitao <leitao@debian.org> Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Add patch_instruction() support for xmonBalbir Singh2017-07-031-2/+5
| | | | | | | | Move from mwrite() to patch_instruction() for xmon for breakpoint addition and removal. Signed-off-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Fix compile error with PPC_8xx=yNicholas Piggin2017-05-301-4/+4
| | | | | | | | | | | Rearrange the code so that mode and badaddr are only defined when they're used. Also unsplit the string for easier grepping, and switch from CONFIG_8xx which is deprecated to CONFIG_PPC_8xx. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Teach xmon oops about radix vectorsMichael Neuling2017-05-011-2/+12
| | | | | | | | | | | Currently if we take an oops caused by an 0x380 or 0x480 exception, we get a print which assumes SLB problems. With radix, these vectors have different meanings. This patch updates the oops message to reflect these different meanings. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Wait for secondaries before IPI'ing on system resetNicholas Piggin2017-04-281-9/+27
| | | | | | | | | | | | | | | An externally triggered system reset (e.g., via QEMU nmi command, or pseries reset button) can cause system reset interrupts on all CPUs. In case this causes xmon to be entered, it is undesirable for the primary (first) CPU into xmon to trigger an NMI IPI to others, because this may cause a nested system reset interrupt. So spin for a time waiting for secondaries to join xmon before performing the NMI IPI, similarly to what the crash dump code does. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Only do it when we come in from system reset, not via sysrq etc.] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/64s: Dedicated system reset interrupt stackNicholas Piggin2017-04-281-0/+1
| | | | | | | | | | | | | | | | The system reset interrupt is used for crash/debug situations, so it is desirable to have as little impact on the normal state of the system as possible. Currently it uses the current kernel stack to process the exception. This stores into the stack which may be involved with the crash. The stack pointer may be corrupted, or it may have overflowed. Avoid or minimise these problems by creating a dedicated NMI stack for the system reset interrupt to use. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/64s: Disallow system reset vs system reset reentrancyNicholas Piggin2017-04-281-0/+1
| | | | | | | | | | | | | | | | | | In preparation for using a dedicated stack for system reset interrupts, prevent a nested system reset from recovering, in order to simplify code that is called in crash/debug path. This allows a system reset interrupt to just use the base stack pointer. Keep an in_nmi nesting counter similarly to the in_mce counter. Consider the interrrupt non-recoverable if it is taken inside another system reset. Interrupt nesting could be allowed similarly to MCE, but system reset is a special case that's not for normal operation, so simplicity wins until there is requirement for nested system reset interrupts. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Deindent the SLB dumping logicMichael Ellerman2017-04-251-17/+22
| | | | | | | | | | Currently the code that dumps SLB entries uses a double-nested if. This means the actual dumping logic is a bit squashed. Deindent it by using continue. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Rashmica Gupta <rashmica.g@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* Merge branch 'topic/xive' (early part) into nextMichael Ellerman2017-04-121-2/+92
|\ | | | | | | | | | | This merges the arch part of the XIVE support, leaving the final commit with the KVM specific pieces dangling on the branch for Paul to merge via the kvm-ppc tree.
| * powerpc/xive: Native exploitation of the XIVE interrupt controllerBenjamin Herrenschmidt2017-04-101-2/+92
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The XIVE interrupt controller is the new interrupt controller found in POWER9. It supports advanced virtualization capabilities among other things. Currently we use a set of firmware calls that simulate the old "XICS" interrupt controller but this is fairly inefficient. This adds the framework for using XIVE along with a native backend which OPAL for configuration. Later, a backend allowing the use in a KVM or PowerVM guest will also be provided. This disables some fast path for interrupts in KVM when XIVE is enabled as these rely on the firmware emulation code which is no longer available when the XIVE is used natively by Linux. A latter patch will make KVM also directly exploit the XIVE, thus recovering the lost performance (and more). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> [mpe: Fixup pr_xxx("XIVE:"...), don't split pr_xxx() strings, tweak Kconfig so XIVE_NATIVE selects XIVE and depends on POWERNV, fix build errors when SMP=n, fold in fixes from Ben: Don't call cpu_online() on an invalid CPU number Fix irq target selection returning out of bounds cpu# Extra sanity checks on cpu numbers ] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc: Create asm/debugfs.h and move powerpc_debugfs_root thereMichael Ellerman2017-04-111-4/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | powerpc_debugfs_root is the dentry representing the root of the "powerpc" directory tree in debugfs. Currently it sits in asm/debug.h, a long with some other things that have "debug" in the name, but are otherwise unrelated. Pull it out into a separate header, which also includes linux/debugfs.h, and convert all the users to include debugfs.h instead of debug.h. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: add debugfs entry for xmonGuilherme G. Piccoli2017-03-281-0/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the xmon debugger is set only via kernel boot command-line. It's disabled by default, and can be enabled with "xmon=on" on the command-line. Also, xmon may be accessed via sysrq mechanism. But we cannot enable/disable xmon in runtime, it needs kernel reload. This patch introduces a debugfs entry for xmon, allowing user to query its current state and change it if desired. Basically, the "xmon" file to read from/write to is under the debugfs mount point, on powerpc directory. It's a simple attribute, value 0 meaning xmon is disabled and value 1 the opposite. Writing these states to the file will take immediate effect in the debugger. Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: drop the nobt option from xmon plus minor fixesGuilherme G. Piccoli2017-03-281-10/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The xmon parameter nobt was added long time ago, by commit 26c8af5f01df ("[POWERPC] print backtrace when entering xmon"). The problem that time was that during a crash in a machine with USB keyboard, xmon wouldn't respond to commands from the keyboard, so printing the backtrace wouldn't be possible. Idea then was to show automatically the backtrace on xmon crash for the first time it's invoked (if it recovers, next time xmon won't show backtrace automatically). The nobt parameter was added _only_ to prevent this automatic trace show. Seems long time ago USB keyboards didn't work that well! We don't need this parameter anymore, the feature of auto showing the backtrace is interesting (imagine a case of auto-reboot script), so this patch extends the functionality, by always showing the backtrace automatically when xmon is invoked; it removes the nobt parameter too. Also, this patch fixes __initdata placement on xmon_early and replaces __initcall() with modern device_initcall() on sysrq handler. Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: Fix an unexpected xmon on/off state changePan Xinhui2017-03-281-7/+10
|/ | | | | | | | | | | | | | | | | Once xmon is triggered by sysrq-x, it is enabled always afterwards even if it is disabled during boot. This will cause a system reset interrupt fail to dump. So keep xmon in its original state after exit. We have several ways to set xmon on or off. 1) by a build config CONFIG_XMON_DEFAULT. 2) by a boot cmdline with xmon or xmon=early or xmon=on to enable xmon and xmon=off to disable xmon. This value will override that in step 1. 3) by a debugfs interface, as proposed in this patchset. And this value can override those in step 1 and 2. Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* sched/headers: Prepare for new header dependencies before moving code to ↵Ingo Molnar2017-03-021-1/+1
| | | | | | | | | | | | | | | | | | | | <linux/sched/signal.h> We are going to split <linux/sched/signal.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/signal.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* Merge tag 'powerpc-4.11-2' of ↵Linus Torvalds2017-03-011-3/+55
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull more powerpc updates from Michael Ellerman: "Highlights include: - an update of the disassembly code used by xmon to the latest versions in binutils. We've received permission from all the authors of the relevant binutils changes to relicense their changes to the relevant files from GPLv3 to GPLv2, for inclusion in Linux. Thanks to Peter Bergner for doing the leg work to get permission from everyone. - addition of the "architected" Power9 CPU table entry, allowing us to boot in Power9 architected mode under a hypervisor. - updates to the Power9 PMU code. - implementation of clear_bit_unlock_is_negative_byte() to optimise unlock_page(). - Freescale updates from Scott: "Highlights include 8xx breakpoints and perf, t1042rdb display support, and board updates." Thanks to: Al Viro, Andrew Donnellan, Aneesh Kumar K.V, Balbir Singh, Douglas Miller, Frédéric Weisbecker, Gavin Shan, Madhavan Srinivasan, Michael Roth, Nathan Fontenot, Naveen N. Rao, Nicholas Piggin, Peter Bergner, Paul E. McKenney, Rashmica Gupta, Russell Currey, Sahil Mehta, Stewart Smith" * tag 'powerpc-4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (48 commits) powerpc: Remove leftover cputime_to_nsecs call causing build error powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU powerpc/optprobes: Fix TOC handling in optprobes trampoline powerpc/pseries: Advertise Hot Plug Event support to firmware cxl: fix nested locking hang during EEH hotplug powerpc/xmon: Dump memory in CPU endian format powerpc/pseries: Revert 'Auto-online hotplugged memory' powerpc/powernv: Make PCI non-optional powerpc/64: Implement clear_bit_unlock_is_negative_byte() powerpc/powernv: Remove unused variable in pnv_pci_sriov_disable() powerpc/kernel: Remove error message in pcibios_setup_phb_resources() powerpc/mm: Fix typo in set_pte_at() pci/hotplug/pnv-php: Disable MSI and PCI device properly pci/hotplug/pnv-php: Disable surprise hotplug capability on conflicts pci/hotplug/pnv-php: Remove WARN_ON() in pnv_php_put_slot() powerpc: Add POWER9 architected mode to cputable powerpc/perf: use is_kernel_addr macro in perf_get_misc_flags() powerpc/perf: Avoid FAB_*_MATCH checks for power9 powerpc/perf: Add restrictions to PMC5 in power9 DD1 powerpc/perf: Use Instruction Counter value ...
| * powerpc/xmon: Dump memory in CPU endian formatDouglas Miller2017-02-211-3/+55
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Extend the dump command to allow display of 2, 4, and 8 byte words in CPU endian format. Also adds dump command for "1 byte values" for the sake of symmetry. New commands are: d1 dump 1 byte values d2 dump 2 byte values d4 dump 4 byte values d8 dump 8 byte values Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com>
* | lib/show_mem.c: teach show_mem to work with the given nodemaskMichal Hocko2017-02-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | show_mem() allows to filter out node specific data which is irrelevant to the allocation request via SHOW_MEM_FILTER_NODES. The filtering is done in skip_free_areas_node which skips all nodes which are not in the mems_allowed of the current process. This works most of the time as expected because the nodemask shouldn't be outside of the allocating task but there are some exceptions. E.g. memory hotplug might want to request allocations from outside of the allowed nodes (see new_node_page). Get rid of this hardcoded behavior and push the allocation mask down the show_mem path and use it instead of cpuset_current_mems_allowed. NULL nodemask is interpreted as cpuset_current_mems_allowed. [akpm@linux-foundation.org: coding-style fixes] Link: http://lkml.kernel.org/r/20170117091543.25850-5-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | Merge tag 'powerpc-4.11-1' of ↵Linus Torvalds2017-02-221-4/+4
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "Highlights include: - Support for direct mapped LPC on POWER9, giving Linux direct access to devices that may be on there such as a UART. - Memory hotplug support for the Power9 Radix MMU. - Add new AUX vectors describing the processor's cache geometry, to be used by glibc. - The ability for a guest to ask the hypervisor to resize the guest's hash table, and in addition support for doing so automatically when memory is hotplugged into/out-of the guest. This allows the hash table to be sized based on the current memory usage of the guest, rather than the maximum possible memory usage. - Implementation of optprobes (kprobe optimisation) for powerpc. In addition there's the topic branch shared with the KVM tree, which includes support for guests to use the Radix MMU on Power9. Thanks to: Alistair Popple, Andrew Donnellan, Aneesh Kumar K.V, Anju T, Anton Blanchard, Benjamin Herrenschmidt, Chris Packham, Daniel Axtens, Daniel Borkmann, David Gibson, Finn Thain, Gautham R. Shenoy, Gavin Shan, Greg Kurz, Joel Stanley, John Allen, Madhavan Srinivasan, Mahesh Salgaonkar, Markus Elfring, Michael Neuling, Nathan Fontenot, Naveen N. Rao, Nicholas Piggin, Paul Mackerras, Ravi Bangoria, Reza Arbab, Shailendra Singh, Vaibhav Jain, Wei Yongjun" * tag 'powerpc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (129 commits) powerpc/mm/radix: Skip ptesync in pte update helpers powerpc/mm/radix: Use ptep_get_and_clear_full when clearing pte for full mm powerpc/mm/radix: Update pte update sequence for pte clear case powerpc/mm: Update PROTFAULT handling in the page fault path powerpc/xmon: Fix data-breakpoint powerpc/mm: Fix build break with BOOK3S_64=n and MEMORY_HOTPLUG=y powerpc/mm: Fix build break when CMA=n && SPAPR_TCE_IOMMU=y powerpc/mm: Fix build break with RADIX=y & HUGETLBFS=n powerpc/pseries: Fix typo in parameter description powerpc/kprobes: Remove kprobe_exceptions_notify() kprobes: Introduce weak variant of kprobe_exceptions_notify() powerpc/ftrace: Fix confusing help text for DISABLE_MPROFILE_KERNEL powerpc/powernv: Fix opal_exit tracepoint opcode powerpc: Add a prototype for mcount() so it can be versioned powerpc: Drop GPL from of_node_to_nid() export to match other arches powerpc/kprobes: Optimize kprobe in kretprobe_trampoline() powerpc/kprobes: Implement Optprobes powerpc/kprobes: Fixes for kprobe_lookup_name() on BE powerpc: Add helper to check if offset is within relative branch range powerpc/bpf: Introduce __PPC_SH64() ...
| * powerpc/xmon: Cleanup to use is_kernel_addr macroMadhavan Srinivasan2017-02-021-4/+4
| | | | | | | | | | Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | sched/cputime, powerpc: Migrate stolen_time field to the accounting structureFrederic Weisbecker2017-01-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | That in order to gather all cputime accumulation to the same place. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Wanpeng Li <wanpeng.li@hotmail.com> Link: http://lkml.kernel.org/r/1483636310-6557-7-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* | sched/cputime, powerpc: Prepare accounting structure for cputime flush on tickFrederic Weisbecker2017-01-141-3/+3
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | In order to prepare for CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y to delay cputime accounting to the tick, provide finegrained accumulators to powerpc in order to store the cputime until flushing. While at it, normalize the name of several fields according to common cputime naming. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Wanpeng Li <wanpeng.li@hotmail.com> Link: http://lkml.kernel.org/r/1483636310-6557-6-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
* powerpc/xmon: Add 'dt' command to dump trace buffersMichael Ellerman2016-11-251-0/+6
| | | | | | | | | | | | | | | | | There is a nice interface for asking ftrace to dump all its tracing buffers. The only down side for use in xmon is that it uses printk. Depending on circumstances printk may not work when in xmon, but it also may, so add a 'dt' command which dumps the ftrace buffers, and add a note to the help to mentiont that it uses printk. Calling this routine also disables tracing, which is problematic if you return from xmon and expect the system to keep operating normally. So after we do the dump turn tracing back on. Both functions already have nop versions defined for when ftrace is not enabled, so we don't need any extra #ifdefs. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* Merge branch 'next' of ↵Michael Ellerman2016-07-301-7/+7
|\ | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux into next Freescale updates from Scott: "Highlights include more 8xx optimizations, device tree updates, and MVME7100 support."
| * powerpc32: provide VIRT_CPU_ACCOUNTINGChristophe Leroy2016-07-091-7/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | This patch provides VIRT_CPU_ACCOUTING to PPC32 architecture. PPC32 doesn't have the PACA structure, so we use the task_info structure to store the accounting data. In order to reuse on PPC32 the PPC64 functions, all u64 data has been replaced by 'unsigned long' so that it is u32 on PPC32 and u64 on PPC64 Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Scott Wood <oss@buserror.net>
* | powerpc/xmon: Dump ISA 2.07 SPRsMichael Ellerman2016-07-141-0/+44
| | | | | | | | Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: Dump ISA 2.06 SPRsMichael Ellerman2016-07-141-0/+31
| | | | | | | | Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: Adjust spacing of existing SPRs to make room for moreMichael Ellerman2016-07-141-5/+6
| | | | | | | | | | | | Purely to make it pleasing to the eye. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: Move static regno into its only userMichael Ellerman2016-07-141-1/+1
| | | | | | | | Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | powerpc/xmon: Remove unused externsMichael Ellerman2016-07-141-5/+0
|/ | | | | | None of these are used, or have been since we merged ppc & ppc64. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Fix SPR read/write commands and add command to dump SPRsPaul Mackerras2016-05-111-60/+76
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | xmon has commands for reading and writing SPRs, but they don't work currently for several reasons. They attempt to synthesize a small function containing an mfspr or mtspr instruction and call it. However, the instructions are on the stack, which is usually not executable. Also, for 64-bit we set up a procedure descriptor, which is fine for the big-endian ABIv1, but not correct for ABIv2. Finally, the code uses the infrastructure for catching memory errors, but that only catches data storage interrupts and machine check interrupts, but a failed mfspr/mtspr can generate a program interrupt or a hypervisor emulation assist interrupt, or be a no-op. Instead of trying to synthesize a function on the fly, this adds two new functions, xmon_mfspr() and xmon_mtspr(), which take an SPR number as an argument and read or write the SPR. Because there is no Power ISA instruction which takes an SPR number in a register, we have to generate one of each possible mfspr and mtspr instruction, for all 1024 possible SPRs. Thus we get just over 8k bytes of code for each of xmon_mfspr() and xmon_mtspr(). However, this 16kB of code pales in comparison to the > 130kB of PPC opcode tables used by the xmon disassembler. To catch interrupts caused by the mfspr/mtspr instructions, we add a new 'catch_spr_faults' flag. If an interrupt occurs while it is set, we come back into xmon() via program_check_interrupt(), _exception() and die(), see that catch_spr_faults is set and do a longjmp to bus_error_jmp, back into read_spr() or write_spr(). This adds a couple of other nice features: first, a "Sa" command that attempts to read and print out the value of all 1024 SPRs. If any mfspr instruction acts as a no-op, then the SPR is not implemented and not printed. Secondly, the Sr and Sw commands detect when an SPR is not implemented (i.e. mfspr is a no-op) and print a message to that effect rather than printing a bogus value. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/mm/radix: Use STD_MMU_64 to properly isolate hash related codeAneesh Kumar K.V2016-05-111-1/+1
| | | | | | | | | | We also use MMU_FTR_RADIX to branch out from code path specific to hash. No functionality change. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Add xmon command to dump process/task similar to ps(1)Douglas Miller2016-02-101-0/+60
| | | | | | | | | Add 'P' command with optional task_struct address to dump all/one task's information: task pointer, kernel stack pointer, PID, PPID, state (interpreted), CPU where (last) running, and command. Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: add command to dump OPAL msglogAndrew Donnellan2016-02-091-0/+58
| | | | | | | | Add the 'do' command to dump the OPAL msglog in xmon. Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> [mpe: Reduce the amount of ifdefery required] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: fix typo in usage messageAndrew Donnellan2016-02-081-1/+1
| | | | | Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Use rtas_call_unlocked() in xmonMichael Ellerman2015-12-171-10/+6
| | | | | | Avoid open coding the logic by using rtas_call_unlocked(). Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* powerpc/xmon: Append linux_banner to exception information in xmon.Rashmica Gupta2015-12-141-0/+2
| | | | | | | | | | | | | | | | | | | | | | Currently if you are in xmon without an oops etc. to view the kernel version you have to type "d $linux_banner" - not necessarily obvious. As this is useful information, append to the output of "e" command. Example output: $mon> e cpu 0x1: Vector: 0 at [c0000000f879ba80] pc: c000000000081718: sysrq_handle_xmon+0x68/0x80 lr: c000000000081718: sysrq_handle_xmon+0x68/0x80 sp: c0000000f879bbe0 msr: 8000000000009033 current = 0xc0000000f604d5c0 paca = 0xc00000000fdc0480 softe: 0 irq_happened: 0x01 pid = 2467, comm = bash Linux version 4.4.0-rc2-00008-gc51af91c3ab3-dirty (rashmica@circle) (gcc version 5.1.1 20150629 (GCC) ) #45 SMP Wed Nov 25 10:25:12 AEDT 2015 Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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