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2020-01-17MIPS: Prevent link failure with kcov instrumentationJouni Hogander1-0/+3
[ Upstream commit a4a3893114a41e365274d5fab5d9ff5acc235ff0 ] __sanitizer_cov_trace_pc() is not linked in and causing link failure if KCOV_INSTRUMENT is enabled. Fix this by disabling instrumentation for compressed image. Signed-off-by: Jouni Hogander <jouni.hogander@unikie.com> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com> Cc: linux-mips@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-17mips: cacheinfo: report shared CPU mapVladimir Kondratiev1-1/+26
[ Upstream commit 3b1313eb32c499d46dc4c3e896d19d9564c879c4 ] Report L1 caches as shared per core; L2 - per cluster. This fixes "perf" that went crazy if shared_cpu_map attribute not reported on sysfs, in form of /sys/devices/system/cpu/cpu*/cache/index*/shared_cpu_list /sys/devices/system/cpu/cpu*/cache/index*/shared_cpu_map Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@intel.com> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-17powerpc/powernv: Disable native PCIe port managementOliver O'Halloran1-0/+17
commit 9d72dcef891030545f39ad386a30cf91df517fb2 upstream. On PowerNV the PCIe topology is (currently) managed by the powernv platform code in Linux in cooperation with the platform firmware. Linux's native PCIe port service drivers operate independently of both and this can cause problems. The main issue is that the portbus driver will conflict with the platform specific hotplug driver (pnv_php) over ownership of the MSI used to notify the host when a hotplug event occurs. The portbus driver claims this MSI on behalf of the individual port services because the same interrupt is used for hotplug events, PMEs (on root ports), and link bandwidth change notifications. The portbus driver will always claim the interrupt even if the individual port service drivers, such as pciehp, are compiled out. The second, bigger, problem is that the hotplug port service driver fundamentally does not work on PowerNV. The platform assumes that all PCI devices have a corresponding arch-specific handle derived from the DT node for the device (pci_dn) and without one the platform will not allow a PCI device to be enabled. This problem is largely due to historical baggage, but it can't be resolved without significant re-factoring of the platform PCI support. We can fix these problems in the interim by setting the "pcie_ports_disabled" flag during platform initialisation. The flag indicates the platform owns the PCIe ports which stops the portbus driver from being registered. This does have the side effect of disabling all port services drivers that is: AER, PME, BW notifications, hotplug, and DPC. However, this is not a huge disadvantage on PowerNV since these services are either unused or handled through other means. Fixes: 66725152fb9f ("PCI/hotplug: PowerPC PowerNV PCI hotplug driver") Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191118065553.30362-1-oohall@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-17arm64: dts: apq8096-db820c: Increase load on l21 for SDCARDLoic Poulain1-0/+2
commit e38161bd325ea541ef2f258d8e28281077dde524 upstream. In the same way as for msm8974-hammerhead, l21 load, used for SDCARD VMMC, needs to be increased in order to prevent any voltage drop issues (due to limited current) happening with some SDCARDS or during specific operations (e.g. write). Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Fixes: 660a9763c6a9 (arm64: dts: qcom: db820c: Add pm8994 regulator node) Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-12ARM: dts: imx6ul: use nvmem-cells for cpu speed gradingAnson Huang1-0/+6
commit 92f0eb08c66a73594cf200e65689e767f7f0da5e upstream. On i.MX6UL, accessing OCOTP directly is wrong because the ocotp clock needs to be enabled first, so use the nvmem-cells binding instead. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org> Cc: Sébastien Szymanski <sebastien.szymanski@armadeus.com> Cc: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-12powerpc/spinlocks: Include correct header for static keyJason A. Donenfeld1-0/+1
commit 6da3eced8c5f3b03340b0c395bacd552c4d52411 upstream. Recently, the spinlock implementation grew a static key optimization, but the jump_label.h header include was left out, leading to build errors: linux/arch/powerpc/include/asm/spinlock.h:44:7: error: implicit declaration of function ‘static_branch_unlikely’ 44 | if (!static_branch_unlikely(&shared_processor)) This commit adds the missing header. mpe: The build break is only seen with CONFIG_JUMP_LABEL=n. Fixes: 656c21d6af5d ("powerpc/shared: Use static key to detect shared processor") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Srikar Dronamraju <srikar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191223133147.129983-1-Jason@zx2c4.com Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-12powerpc/vcpu: Assume dedicated processors as non-preemptSrikar Dronamraju2-1/+10
commit 14c73bd344da60abaf7da3ea2e7733ddda35bbac upstream. With commit 247f2f6f3c70 ("sched/core: Don't schedule threads on pre-empted vCPUs"), the scheduler avoids preempted vCPUs to schedule tasks on wakeup. This leads to wrong choice of CPU, which in-turn leads to larger wakeup latencies. Eventually, it leads to performance regression in latency sensitive benchmarks like soltp, schbench etc. On Powerpc, vcpu_is_preempted() only looks at yield_count. If the yield_count is odd, the vCPU is assumed to be preempted. However yield_count is increased whenever the LPAR enters CEDE state (idle). So any CPU that has entered CEDE state is assumed to be preempted. Even if vCPU of dedicated LPAR is preempted/donated, it should have right of first-use since they are supposed to own the vCPU. On a Power9 System with 32 cores: # lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 128 On-line CPU(s) list: 0-127 Thread(s) per core: 8 Core(s) per socket: 1 Socket(s): 16 NUMA node(s): 2 Model: 2.2 (pvr 004e 0202) Model name: POWER9 (architected), altivec supported Hypervisor vendor: pHyp Virtualization type: para L1d cache: 32K L1i cache: 32K L2 cache: 512K L3 cache: 10240K NUMA node0 CPU(s): 0-63 NUMA node1 CPU(s): 64-127 # perf stat -a -r 5 ./schbench v5.4 v5.4 + patch Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 45 75.0000th: 62 75.0th: 63 90.0000th: 71 90.0th: 74 95.0000th: 77 95.0th: 78 *99.0000th: 91 *99.0th: 82 99.5000th: 707 99.5th: 83 99.9000th: 6920 99.9th: 86 min=0, max=10048 min=0, max=96 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 46 75.0000th: 61 75.0th: 64 90.0000th: 72 90.0th: 75 95.0000th: 79 95.0th: 79 *99.0000th: 691 *99.0th: 83 99.5000th: 3972 99.5th: 85 99.9000th: 8368 99.9th: 91 min=0, max=16606 min=0, max=117 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 46 75.0000th: 61 75.0th: 64 90.0000th: 71 90.0th: 75 95.0000th: 77 95.0th: 79 *99.0000th: 106 *99.0th: 83 99.5000th: 2364 99.5th: 84 99.9000th: 7480 99.9th: 90 min=0, max=10001 min=0, max=95 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 47 75.0000th: 62 75.0th: 65 90.0000th: 72 90.0th: 75 95.0000th: 78 95.0th: 79 *99.0000th: 93 *99.0th: 84 99.5000th: 108 99.5th: 85 99.9000th: 6792 99.9th: 90 min=0, max=17681 min=0, max=117 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 46 50.0th: 45 75.0000th: 62 75.0th: 64 90.0000th: 73 90.0th: 75 95.0000th: 79 95.0th: 79 *99.0000th: 113 *99.0th: 82 99.5000th: 2724 99.5th: 83 99.9000th: 6184 99.9th: 93 min=0, max=9887 min=0, max=111 Performance counter stats for 'system wide' (5 runs): context-switches 43,373 ( +- 0.40% ) 44,597 ( +- 0.55% ) cpu-migrations 1,211 ( +- 5.04% ) 220 ( +- 6.23% ) page-faults 15,983 ( +- 5.21% ) 15,360 ( +- 3.38% ) Waiman Long suggested using static_keys. Fixes: 247f2f6f3c70 ("sched/core: Don't schedule threads on pre-empted vCPUs") Cc: stable@vger.kernel.org # v4.18+ Reported-by: Parth Shah <parth@linux.ibm.com> Reported-by: Ihor Pasichnyk <Ihor.Pasichnyk@ibm.com> Tested-by: Juri Lelli <juri.lelli@redhat.com> Acked-by: Waiman Long <longman@redhat.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Phil Auld <pauld@redhat.com> Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com> Tested-by: Parth Shah <parth@linux.ibm.com> [mpe: Move the key and setting of the key to pseries/setup.c] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191213035036.6913-1-mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-12parisc: Fix compiler warnings in debug_core.cHelge Deller1-2/+8
[ Upstream commit 75cf9797006a3a9f29a3a25c1febd6842a4a9eb2 ] Fix this compiler warning: kernel/debug/debug_core.c: In function ‘kgdb_cpu_enter’: arch/parisc/include/asm/cmpxchg.h:48:3: warning: value computed is not used [-Wunused-value] 48 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr)))) arch/parisc/include/asm/atomic.h:78:30: note: in expansion of macro ‘xchg’ 78 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | ^~~~ kernel/debug/debug_core.c:596:4: note: in expansion of macro ‘atomic_xchg’ 596 | atomic_xchg(&kgdb_active, cpu); | ^~~~~~~~~~~ Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12s390/purgatory: do not build purgatory with kcov, kasan and friendsChristian Borntraeger2-2/+7
[ Upstream commit c23587c92f6e3260fe3b82bb75b38aa2553b9468 ] the purgatory must not rely on functions from the "old" kernel, so we must disable kasan and friends. We also need to have a separate copy of string.c as the default does not build memcmp with KASAN. Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12perf/x86/intel: Fix PT PMI handlingAlexander Shishkin1-2/+7
[ Upstream commit 92ca7da4bdc24d63bb0bcd241c11441ddb63b80a ] Commit: ccbebba4c6bf ("perf/x86/intel/pt: Bypass PT vs. LBR exclusivity if the core supports it") skips the PT/LBR exclusivity check on CPUs where PT and LBRs coexist, but also inadvertently skips the active_events bump for PT in that case, which is a bug. If there aren't any hardware events at the same time as PT, the PMI handler will ignore PT PMIs, as active_events reads zero in that case, resulting in the "Uhhuh" spurious NMI warning and PT data loss. Fix this by always increasing active_events for PT events. Fixes: ccbebba4c6bf ("perf/x86/intel/pt: Bypass PT vs. LBR exclusivity if the core supports it") Reported-by: Vitaly Slobodskoy <vitaly.slobodskoy@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Link: https://lkml.kernel.org/r/20191210105101.77210-1-alexander.shishkin@linux.intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12parisc: add missing __init annotationSven Schnelle1-1/+1
[ Upstream commit aeea5eae4fd54e94d820ed17ea3b238160be723e ] compilation failed with: MODPOST vmlinux.o WARNING: vmlinux.o(.text.unlikely+0xa0c): Section mismatch in reference from the function walk_lower_bus() to the function .init.text:walk_native_bus() The function walk_lower_bus() references the function __init walk_native_bus(). This is often because walk_lower_bus lacks a __init annotation or the annotation of walk_native_bus is wrong. FATAL: modpost: Section mismatches detected. Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them. make[2]: *** [/home/svens/linux/parisc-linux/src/scripts/Makefile.modpost:64: __modpost] Error 1 make[1]: *** [/home/svens/linux/parisc-linux/src/Makefile:1077: vmlinux] Error 2 make[1]: Leaving directory '/home/svens/linux/parisc-linux/build' make: *** [Makefile:179: sub-make] Error 2 Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12powerpc: Ensure that swiotlb buffer is allocated from low memoryMike Rapoport1-0/+8
[ Upstream commit 8fabc623238e68b3ac63c0dd1657bf86c1fa33af ] Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a system has more physical memory than this limit, the swiotlb buffer is not addressable because it is allocated from memblock using top-down mode. Force memblock to bottom-up mode before calling swiotlb_init() to ensure that the swiotlb buffer is DMA-able. Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191204123524.22919-1-rppt@kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12ARM: dts: am437x-gp/epos-evm: fix panel compatibleTomi Valkeinen2-2/+2
[ Upstream commit c6b16761c6908d3dc167a0a566578b4b0b972905 ] The LCD panel on AM4 GP EVMs and ePOS boards seems to be osd070t1718-19ts. The current dts files say osd057T0559-34ts. Possibly the panel has changed since the early EVMs, or there has been a mistake with the panel type. Update the DT files accordingly. Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12bpf, mips: Limit to 33 tail callsPaul Chaignon1-4/+5
[ Upstream commit e49e6f6db04e915dccb494ae10fa14888fea6f89 ] All BPF JIT compilers except RISC-V's and MIPS' enforce a 33-tail calls limit at runtime. In addition, a test was recently added, in tailcalls2, to check this limit. This patch updates the tail call limit in MIPS' JIT compiler to allow 33 tail calls. Fixes: b6bd53f9c4e8 ("MIPS: Add missing file for eBPF JIT.") Reported-by: Mahshid Khezri <khezri.mahshid@gmail.com> Signed-off-by: Paul Chaignon <paul.chaignon@orange.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/b8eb2caac1c25453c539248e56ca22f74b5316af.1575916815.git.paul.chaignon@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12ARM: dts: bcm283x: Fix critical trip pointStefan Wahren1-1/+1
[ Upstream commit 30e647a764d446723a7e0fb08d209e0104f16173 ] During definition of the CPU thermal zone of BCM283x SoC family there was a misunderstanding of the meaning "criticial trip point" and the thermal throttling range of the VideoCore firmware. The latter one takes effect when the core temperature is at least 85 degree celsius or higher So the current critical trip point doesn't make sense, because the thermal shutdown appears before the firmware has a chance to throttle the ARM core(s). Fix these unwanted shutdowns by increasing the critical trip point to a value which shouldn't be reached with working thermal throttling. Fixes: 0fe4d2181cc4 ("ARM: dts: bcm283x: Add CPU thermal zone with 1 trip point") Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12ARM: dts: Cygnus: Fix MDIO node address/size cellsFlorian Fainelli1-2/+2
[ Upstream commit fac2c2da3596d77c343988bb0d41a8c533b2e73c ] The MDIO node on Cygnus had an reversed #address-cells and #size-cells properties, correct those. Fixes: 40c26d3af60a ("ARM: dts: Cygnus: Add the ethernet switch and ethernet PHY") Reported-by: Simon Horman <simon.horman@netronome.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12ARM: dts: BCM5301X: Fix MDIO node address/size cellsFlorian Fainelli1-2/+2
[ Upstream commit 093c3f94e922d83a734fc4da08cc5814990f32c6 ] The MDIO node on BCM5301X had an reversed #address-cells and #size-cells properties, correct those, silencing checker warnings: .../linux/arch/arm/boot/dts/bcm4708-asus-rt-ac56u.dt.yaml: mdio@18003000: #address-cells:0:0: 1 was expected Reported-by: Simon Horman <simon.horman@netronome.com> Fixes: 23f1eca6d59b ("ARM: dts: BCM5301X: Specify MDIO bus in the DT") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12ARM: vexpress: Set-up shared OPP table instead of individual for each CPUSudeep Holla1-1/+11
[ Upstream commit 2a76352ad2cc6b78e58f737714879cc860903802 ] Currently we add individual copy of same OPP table for each CPU within the cluster. This is redundant and doesn't reflect the reality. We can't use core cpumask to set policy->cpus in ve_spc_cpufreq_init() anymore as it gets called via cpuhp_cpufreq_online()->cpufreq_online() ->cpufreq_driver->init() and the cpumask gets updated upon CPU hotplug operations. It also may cause issues when the vexpress_spc_cpufreq driver is built as a module. Since ve_spc_clk_init is built-in device initcall, we should be able to use the same topology_core_cpumask to set the opp sharing cpumask via dev_pm_opp_set_sharing_cpus and use the same later in the driver via dev_pm_opp_get_sharing_cpus. Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12ARM: dts: imx6ul: imx6ul-14x14-evk.dtsi: Fix SPI NOR probingStefan Roese1-1/+1
[ Upstream commit 0aeb1f2b74f3402e9cdb7c0b8e2c369c9767301e ] Without this "jedec,spi-nor" compatible property, probing of the SPI NOR does not work on the NXP i.MX6ULL EVK. Fix this by adding this compatible property to the DT. Fixes: 7d77b8505aa9 ("ARM: dts: imx6ull: fix the imx6ull-14x14-evk configuration") Signed-off-by: Stefan Roese <sr@denx.de> Reviewed-by: Fabio Estevam <festevam@gmail.com> Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-12x86/efi: Update e820 with reserved EFI boot services data to fix kexec breakageDave Young1-4/+2
[ Upstream commit af164898482817a1d487964b68f3c21bae7a1beb ] Michael Weiser reported that he got this error during a kexec rebooting: esrt: Unsupported ESRT version 2904149718861218184. The ESRT memory stays in EFI boot services data, and it was reserved in kernel via efi_mem_reserve(). The initial purpose of the reservation is to reuse the EFI boot services data across kexec reboot. For example the BGRT image data and some ESRT memory like Michael reported. But although the memory is reserved it is not updated in the X86 E820 table, and kexec_file_load() iterates system RAM in the IO resource list to find places for kernel, initramfs and other stuff. In Michael's case the kexec loaded initramfs overwrote the ESRT memory and then the failure happened. Since kexec_file_load() depends on the E820 table being updated, just fix this by updating the reserved EFI boot services memory as reserved type in E820. Originally any memory descriptors with EFI_MEMORY_RUNTIME attribute are bypassed in the reservation code path because they are assumed as reserved. But the reservation is still needed for multiple kexec reboots, and it is the only possible case we come here thus just drop the code chunk, then everything works without side effects. On my machine the ESRT memory sits in an EFI runtime data range, it does not trigger the problem, but I successfully tested with BGRT instead. both kexec_load() and kexec_file_load() work and kdump works as well. [ mingo: Edited the changelog. ] Reported-by: Michael Weiser <michael@weiser.dinsnail.net> Tested-by: Michael Weiser <michael@weiser.dinsnail.net> Signed-off-by: Dave Young <dyoung@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kexec@lists.infradead.org Cc: linux-efi@vger.kernel.org Link: https://lkml.kernel.org/r/20191204075233.GA10520@dhcp-128-65.nay.redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-09perf/x86/intel/bts: Fix the use of page_private()Alexander Shishkin1-5/+11
[ Upstream commit ff61541cc6c1962957758ba433c574b76f588d23 ] Commit 8062382c8dbe2 ("perf/x86/intel/bts: Add BTS PMU driver") brought in a warning with the BTS buffer initialization that is easily tripped with (assuming KPTI is disabled): instantly throwing: > ------------[ cut here ]------------ > WARNING: CPU: 2 PID: 326 at arch/x86/events/intel/bts.c:86 bts_buffer_setup_aux+0x117/0x3d0 > Modules linked in: > CPU: 2 PID: 326 Comm: perf Not tainted 5.4.0-rc8-00291-gceb9e77324fa #904 > RIP: 0010:bts_buffer_setup_aux+0x117/0x3d0 > Call Trace: > rb_alloc_aux+0x339/0x550 > perf_mmap+0x607/0xc70 > mmap_region+0x76b/0xbd0 ... It appears to assume (for lost raisins) that PagePrivate() is set, while later it actually tests for PagePrivate() before using page_private(). Make it consistent and always check PagePrivate() before using page_private(). Fixes: 8062382c8dbe2 ("perf/x86/intel/bts: Add BTS PMU driver") Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Link: https://lkml.kernel.org/r/20191205142853.28894-2-alexander.shishkin@linux.intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-09s390/smp: fix physical to logical CPU map for SMTHeiko Carstens1-26/+54
[ Upstream commit 72a81ad9d6d62dcb79f7e8ad66ffd1c768b72026 ] If an SMT capable system is not IPL'ed from the first CPU the setup of the physical to logical CPU mapping is broken: the IPL core gets CPU number 0, but then the next core gets CPU number 1. Correct would be that all SMT threads of CPU 0 get the subsequent logical CPU numbers. This is important since a lot of code (like e.g. the CPU topology code) assumes that CPU maps are setup like this. If the mapping is broken the system will not IPL due to broken topology masks: [ 1.716341] BUG: arch topology broken [ 1.716342] the SMT domain not a subset of the MC domain [ 1.716343] BUG: arch topology broken [ 1.716344] the MC domain not a subset of the BOOK domain This scenario can usually not happen since LPARs are always IPL'ed from CPU 0 and also re-IPL is intiated from CPU 0. However older kernels did initiate re-IPL on an arbitrary CPU. If therefore a re-IPL from an old kernel into a new kernel is initiated this may lead to crash. Fix this by setting up the physical to logical CPU mapping correctly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-09KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flagMichael Roth6-14/+108
[ Upstream commit 3a83f677a6eeff65751b29e3648d7c69c3be83f3 ] On a 2-socket Power9 system with 32 cores/128 threads (SMT4) and 1TB of memory running the following guest configs: guest A: - 224GB of memory - 56 VCPUs (sockets=1,cores=28,threads=2), where: VCPUs 0-1 are pinned to CPUs 0-3, VCPUs 2-3 are pinned to CPUs 4-7, ... VCPUs 54-55 are pinned to CPUs 108-111 guest B: - 4GB of memory - 4 VCPUs (sockets=1,cores=4,threads=1) with the following workloads (with KSM and THP enabled in all): guest A: stress --cpu 40 --io 20 --vm 20 --vm-bytes 512M guest B: stress --cpu 4 --io 4 --vm 4 --vm-bytes 512M host: stress --cpu 4 --io 4 --vm 2 --vm-bytes 256M the below soft-lockup traces were observed after an hour or so and persisted until the host was reset (this was found to be reliably reproducible for this configuration, for kernels 4.15, 4.18, 5.0, and 5.3-rc5): [ 1253.183290] rcu: INFO: rcu_sched self-detected stall on CPU [ 1253.183319] rcu: 124-....: (5250 ticks this GP) idle=10a/1/0x4000000000000002 softirq=5408/5408 fqs=1941 [ 1256.287426] watchdog: BUG: soft lockup - CPU#105 stuck for 23s! [CPU 52/KVM:19709] [ 1264.075773] watchdog: BUG: soft lockup - CPU#24 stuck for 23s! [worker:19913] [ 1264.079769] watchdog: BUG: soft lockup - CPU#31 stuck for 23s! [worker:20331] [ 1264.095770] watchdog: BUG: soft lockup - CPU#45 stuck for 23s! [worker:20338] [ 1264.131773] watchdog: BUG: soft lockup - CPU#64 stuck for 23s! [avocado:19525] [ 1280.408480] watchdog: BUG: soft lockup - CPU#124 stuck for 22s! [ksmd:791] [ 1316.198012] rcu: INFO: rcu_sched self-detected stall on CPU [ 1316.198032] rcu: 124-....: (21003 ticks this GP) idle=10a/1/0x4000000000000002 softirq=5408/5408 fqs=8243 [ 1340.411024] watchdog: BUG: soft lockup - CPU#124 stuck for 22s! [ksmd:791] [ 1379.212609] rcu: INFO: rcu_sched self-detected stall on CPU [ 1379.212629] rcu: 124-....: (36756 ticks this GP) idle=10a/1/0x4000000000000002 softirq=5408/5408 fqs=14714 [ 1404.413615] watchdog: BUG: soft lockup - CPU#124 stuck for 22s! [ksmd:791] [ 1442.227095] rcu: INFO: rcu_sched self-detected stall on CPU [ 1442.227115] rcu: 124-....: (52509 ticks this GP) idle=10a/1/0x4000000000000002 softirq=5408/5408 fqs=21403 [ 1455.111787] INFO: task worker:19907 blocked for more than 120 seconds. [ 1455.111822] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.111833] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.111884] INFO: task worker:19908 blocked for more than 120 seconds. [ 1455.111905] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.111925] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.111966] INFO: task worker:20328 blocked for more than 120 seconds. [ 1455.111986] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.111998] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.112048] INFO: task worker:20330 blocked for more than 120 seconds. [ 1455.112068] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.112097] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.112138] INFO: task worker:20332 blocked for more than 120 seconds. [ 1455.112159] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.112179] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.112210] INFO: task worker:20333 blocked for more than 120 seconds. [ 1455.112231] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.112242] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.112282] INFO: task worker:20335 blocked for more than 120 seconds. [ 1455.112303] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 [ 1455.112332] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1455.112372] INFO: task worker:20336 blocked for more than 120 seconds. [ 1455.112392] Tainted: G L 5.3.0-rc5-mdr-vanilla+ #1 CPUs 45, 24, and 124 are stuck on spin locks, likely held by CPUs 105 and 31. CPUs 105 and 31 are stuck in smp_call_function_many(), waiting on target CPU 42. For instance: # CPU 105 registers (via xmon) R00 = c00000000020b20c R16 = 00007d1bcd800000 R01 = c00000363eaa7970 R17 = 0000000000000001 R02 = c0000000019b3a00 R18 = 000000000000006b R03 = 000000000000002a R19 = 00007d537d7aecf0 R04 = 000000000000002a R20 = 60000000000000e0 R05 = 000000000000002a R21 = 0801000000000080 R06 = c0002073fb0caa08 R22 = 0000000000000d60 R07 = c0000000019ddd78 R23 = 0000000000000001 R08 = 000000000000002a R24 = c00000000147a700 R09 = 0000000000000001 R25 = c0002073fb0ca908 R10 = c000008ffeb4e660 R26 = 0000000000000000 R11 = c0002073fb0ca900 R27 = c0000000019e2464 R12 = c000000000050790 R28 = c0000000000812b0 R13 = c000207fff623e00 R29 = c0002073fb0ca808 R14 = 00007d1bbee00000 R30 = c0002073fb0ca800 R15 = 00007d1bcd600000 R31 = 0000000000000800 pc = c00000000020b260 smp_call_function_many+0x3d0/0x460 cfar= c00000000020b270 smp_call_function_many+0x3e0/0x460 lr = c00000000020b20c smp_call_function_many+0x37c/0x460 msr = 900000010288b033 cr = 44024824 ctr = c000000000050790 xer = 0000000000000000 trap = 100 CPU 42 is running normally, doing VCPU work: # CPU 42 stack trace (via xmon) [link register ] c00800001be17188 kvmppc_book3s_radix_page_fault+0x90/0x2b0 [kvm_hv] [c000008ed3343820] c000008ed3343850 (unreliable) [c000008ed33438d0] c00800001be11b6c kvmppc_book3s_hv_page_fault+0x264/0xe30 [kvm_hv] [c000008ed33439d0] c00800001be0d7b4 kvmppc_vcpu_run_hv+0x8dc/0xb50 [kvm_hv] [c000008ed3343ae0] c00800001c10891c kvmppc_vcpu_run+0x34/0x48 [kvm] [c000008ed3343b00] c00800001c10475c kvm_arch_vcpu_ioctl_run+0x244/0x420 [kvm] [c000008ed3343b90] c00800001c0f5a78 kvm_vcpu_ioctl+0x470/0x7c8 [kvm] [c000008ed3343d00] c000000000475450 do_vfs_ioctl+0xe0/0xc70 [c000008ed3343db0] c0000000004760e4 ksys_ioctl+0x104/0x120 [c000008ed3343e00] c000000000476128 sys_ioctl+0x28/0x80 [c000008ed3343e20] c00000000000b388 system_call+0x5c/0x70 --- Exception: c00 (System Call) at 00007d545cfd7694 SP (7d53ff7edf50) is in userspace It was subsequently found that ipi_message[PPC_MSG_CALL_FUNCTION] was set for CPU 42 by at least 1 of the CPUs waiting in smp_call_function_many(), but somehow the corresponding call_single_queue entries were never processed by CPU 42, causing the callers to spin in csd_lock_wait() indefinitely. Nick Piggin suggested something similar to the following sequence as a possible explanation (interleaving of CALL_FUNCTION/RESCHEDULE IPI messages seems to be most common, but any mix of CALL_FUNCTION and !CALL_FUNCTION messages could trigger it): CPU X: smp_muxed_ipi_set_message(): X: smp_mb() X: message[RESCHEDULE] = 1 X: doorbell_global_ipi(42): X: kvmppc_set_host_ipi(42, 1) X: ppc_msgsnd_sync()/smp_mb() X: ppc_msgsnd() -> 42 42: doorbell_exception(): // from CPU X 42: ppc_msgsync() 105: smp_muxed_ipi_set_message(): 105: smb_mb() // STORE DEFERRED DUE TO RE-ORDERING --105: message[CALL_FUNCTION] = 1 | 105: doorbell_global_ipi(42): | 105: kvmppc_set_host_ipi(42, 1) | 42: kvmppc_set_host_ipi(42, 0) | 42: smp_ipi_demux_relaxed() | 42: // returns to executing guest | // RE-ORDERED STORE COMPLETES ->105: message[CALL_FUNCTION] = 1 105: ppc_msgsnd_sync()/smp_mb() 105: ppc_msgsnd() -> 42 42: local_paca->kvm_hstate.host_ipi == 0 // IPI ignored 105: // hangs waiting on 42 to process messages/call_single_queue This can be prevented with an smp_mb() at the beginning of kvmppc_set_host_ipi(), such that stores to message[<type>] (or other state indicated by the host_ipi flag) are ordered vs. the store to to host_ipi. However, doing so might still allow for the following scenario (not yet observed): CPU X: smp_muxed_ipi_set_message(): X: smp_mb() X: message[RESCHEDULE] = 1 X: doorbell_global_ipi(42): X: kvmppc_set_host_ipi(42, 1) X: ppc_msgsnd_sync()/smp_mb() X: ppc_msgsnd() -> 42 42: doorbell_exception(): // from CPU X 42: ppc_msgsync() // STORE DEFERRED DUE TO RE-ORDERING -- 42: kvmppc_set_host_ipi(42, 0) | 42: smp_ipi_demux_relaxed() | 105: smp_muxed_ipi_set_message(): | 105: smb_mb() | 105: message[CALL_FUNCTION] = 1 | 105: doorbell_global_ipi(42): | 105: kvmppc_set_host_ipi(42, 1) | // RE-ORDERED STORE COMPLETES -> 42: kvmppc_set_host_ipi(42, 0) 42: // returns to executing guest 105: ppc_msgsnd_sync()/smp_mb() 105: ppc_msgsnd() -> 42 42: local_paca->kvm_hstate.host_ipi == 0 // IPI ignored 105: // hangs waiting on 42 to process messages/call_single_queue Fixing this scenario would require an smp_mb() *after* clearing host_ipi flag in kvmppc_set_host_ipi() to order the store vs. subsequent processing of IPI messages. To handle both cases, this patch splits kvmppc_set_host_ipi() into separate set/clear functions, where we execute smp_mb() prior to setting host_ipi flag, and after clearing host_ipi flag. These functions pair with each other to synchronize the sender and receiver sides. With that change in place the above workload ran for 20 hours without triggering any lock-ups. Fixes: 755563bc79c7 ("powerpc/powernv: Fixes for hypervisor doorbell handling") # v4.0 Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Acked-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190911223155.16045-1-mdroth@linux.vnet.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-09powerpc/pseries/hvconsole: Fix stack overread via udbgDaniel Axtens1-1/+1
[ Upstream commit 934bda59f286d0221f1a3ebab7f5156a996cc37d ] While developing KASAN for 64-bit book3s, I hit the following stack over-read. It occurs because the hypercall to put characters onto the terminal takes 2 longs (128 bits/16 bytes) of characters at a time, and so hvc_put_chars() would unconditionally copy 16 bytes from the argument buffer, regardless of supplied length. However, udbg_hvc_putc() can call hvc_put_chars() with a single-byte buffer, leading to the error. ================================================================== BUG: KASAN: stack-out-of-bounds in hvc_put_chars+0xdc/0x110 Read of size 8 at addr c0000000023e7a90 by task swapper/0 CPU: 0 PID: 0 Comm: swapper Not tainted 5.2.0-rc2-next-20190528-02824-g048a6ab4835b #113 Call Trace: dump_stack+0x104/0x154 (unreliable) print_address_description+0xa0/0x30c __kasan_report+0x20c/0x224 kasan_report+0x18/0x30 __asan_report_load8_noabort+0x24/0x40 hvc_put_chars+0xdc/0x110 hvterm_raw_put_chars+0x9c/0x110 udbg_hvc_putc+0x154/0x200 udbg_write+0xf0/0x240 console_unlock+0x868/0xd30 register_console+0x970/0xe90 register_early_udbg_console+0xf8/0x114 setup_arch+0x108/0x790 start_kernel+0x104/0x784 start_here_common+0x1c/0x534 Memory state around the buggy address: c0000000023e7980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0000000023e7a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 >c0000000023e7a80: f1 f1 01 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 ^ c0000000023e7b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0000000023e7b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== Document that a 16-byte buffer is requred, and provide it in udbg. Signed-off-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-09arm64: dts: meson: odroid-c2: Disable usb_otg bus to avoid power failed warningAnand Moon1-2/+2
commit 72c9b5f6f75fbc6c47e0a2d02bc3838a2a47c90a upstream. usb_otg bus needs to get initialize from the u-boot to be configured to used as power source to SBC or usb otg port will get configured as host device. Right now this support is missing in the u-boot and phy driver so to avoid power failed warning, we would disable this feature until proper fix is found. [ 2.716048] phy phy-c0000000.phy.0: USB ID detect failed! [ 2.720186] phy phy-c0000000.phy.0: phy poweron failed --> -22 [ 2.726001] ------------[ cut here ]------------ [ 2.730583] WARNING: CPU: 0 PID: 12 at drivers/regulator/core.c:2039 _regulator_put+0x3c/0xe8 [ 2.738983] Modules linked in: [ 2.742005] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.2.9-1-ARCH #1 [ 2.748643] Hardware name: Hardkernel ODROID-C2 (DT) [ 2.753566] Workqueue: events deferred_probe_work_func [ 2.758649] pstate: 60000005 (nZCv daif -PAN -UAO) [ 2.763394] pc : _regulator_put+0x3c/0xe8 [ 2.767361] lr : _regulator_put+0x3c/0xe8 [ 2.771326] sp : ffff000011aa3a50 [ 2.774604] x29: ffff000011aa3a50 x28: ffff80007ed1b600 [ 2.779865] x27: ffff80007f7036a8 x26: ffff80007f7036a8 [ 2.785126] x25: 0000000000000000 x24: ffff000011a44458 [ 2.790387] x23: ffff000011344218 x22: 0000000000000009 [ 2.795649] x21: ffff000011aa3b68 x20: ffff80007ed1b500 [ 2.800910] x19: ffff80007ed1b500 x18: 0000000000000010 [ 2.806171] x17: 000000005be5943c x16: 00000000f1c73b29 [ 2.811432] x15: ffffffffffffffff x14: ffff0000117396c8 [ 2.816694] x13: ffff000091aa37a7 x12: ffff000011aa37af [ 2.821955] x11: ffff000011763000 x10: ffff000011aa3730 [ 2.827216] x9 : 00000000ffffffd0 x8 : ffff000010871760 [ 2.832477] x7 : 00000000000000d0 x6 : ffff0000119d151b [ 2.837739] x5 : 000000000000000f x4 : 0000000000000000 [ 2.843000] x3 : 0000000000000000 x2 : 38104b2678c20100 [ 2.848261] x1 : 0000000000000000 x0 : 0000000000000024 [ 2.853523] Call trace: [ 2.855940] _regulator_put+0x3c/0xe8 [ 2.859562] regulator_put+0x34/0x48 [ 2.863098] regulator_bulk_free+0x40/0x58 [ 2.867153] devm_regulator_bulk_release+0x24/0x30 [ 2.871896] release_nodes+0x1f0/0x2e0 [ 2.875604] devres_release_all+0x64/0xa4 [ 2.879571] really_probe+0x1c8/0x3e0 [ 2.883194] driver_probe_device+0xe4/0x138 [ 2.887334] __device_attach_driver+0x90/0x110 [ 2.891733] bus_for_each_drv+0x8c/0xd8 [ 2.895527] __device_attach+0xdc/0x160 [ 2.899322] device_initial_probe+0x24/0x30 [ 2.903463] bus_probe_device+0x9c/0xa8 [ 2.907258] deferred_probe_work_func+0xa0/0xf0 [ 2.911745] process_one_work+0x1b4/0x408 [ 2.915711] worker_thread+0x54/0x4b8 [ 2.919334] kthread+0x12c/0x130 [ 2.922526] ret_from_fork+0x10/0x1c [ 2.926060] ---[ end trace 51a68f4c0035d6c0 ]--- [ 2.930691] ------------[ cut here ]------------ [ 2.935242] WARNING: CPU: 0 PID: 12 at drivers/regulator/core.c:2039 _regulator_put+0x3c/0xe8 [ 2.943653] Modules linked in: [ 2.946675] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G W 5.2.9-1-ARCH #1 [ 2.954694] Hardware name: Hardkernel ODROID-C2 (DT) [ 2.959613] Workqueue: events deferred_probe_work_func [ 2.964700] pstate: 60000005 (nZCv daif -PAN -UAO) [ 2.969445] pc : _regulator_put+0x3c/0xe8 [ 2.973412] lr : _regulator_put+0x3c/0xe8 [ 2.977377] sp : ffff000011aa3a50 [ 2.980655] x29: ffff000011aa3a50 x28: ffff80007ed1b600 [ 2.985916] x27: ffff80007f7036a8 x26: ffff80007f7036a8 [ 2.991177] x25: 0000000000000000 x24: ffff000011a44458 [ 2.996439] x23: ffff000011344218 x22: 0000000000000009 [ 3.001700] x21: ffff000011aa3b68 x20: ffff80007ed1bd00 [ 3.006961] x19: ffff80007ed1bd00 x18: 0000000000000010 [ 3.012222] x17: 000000005be5943c x16: 00000000f1c73b29 [ 3.017484] x15: ffffffffffffffff x14: ffff0000117396c8 [ 3.022745] x13: ffff000091aa37a7 x12: ffff000011aa37af [ 3.028006] x11: ffff000011763000 x10: ffff000011aa3730 [ 3.033267] x9 : 00000000ffffffd0 x8 : ffff000010871760 [ 3.038528] x7 : 00000000000000fd x6 : ffff0000119d151b [ 3.043790] x5 : 000000000000000f x4 : 0000000000000000 [ 3.049051] x3 : 0000000000000000 x2 : 38104b2678c20100 [ 3.054312] x1 : 0000000000000000 x0 : 0000000000000024 [ 3.059574] Call trace: [ 3.061991] _regulator_put+0x3c/0xe8 [ 3.065613] regulator_put+0x34/0x48 [ 3.069149] regulator_bulk_free+0x40/0x58 [ 3.073203] devm_regulator_bulk_release+0x24/0x30 [ 3.077947] release_nodes+0x1f0/0x2e0 [ 3.081655] devres_release_all+0x64/0xa4 [ 3.085622] really_probe+0x1c8/0x3e0 [ 3.089245] driver_probe_device+0xe4/0x138 [ 3.093385] __device_attach_driver+0x90/0x110 [ 3.097784] bus_for_each_drv+0x8c/0xd8 [ 3.101578] __device_attach+0xdc/0x160 [ 3.105373] device_initial_probe+0x24/0x30 [ 3.109514] bus_probe_device+0x9c/0xa8 [ 3.113309] deferred_probe_work_func+0xa0/0xf0 [ 3.117796] process_one_work+0x1b4/0x408 [ 3.121762] worker_thread+0x54/0x4b8 [ 3.125384] kthread+0x12c/0x130 [ 3.128575] ret_from_fork+0x10/0x1c [ 3.132110] ---[ end trace 51a68f4c0035d6c1 ]--- [ 3.136753] dwc2: probe of c9000000.usb failed with error -22 Fixes: 5a0803bd5ae2 ("ARM64: dts: meson-gxbb-odroidc2: Enable USB Nodes") Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Jerome Brunet <jbrunet@baylibre.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Signed-off-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-09arm64: Revert support for execute-only user mappingsCatalin Marinas3-11/+6
commit 24cecc37746393432d994c0dbc251fb9ac7c5d72 upstream. The ARMv8 64-bit architecture supports execute-only user permissions by clearing the PTE_USER and PTE_UXN bits, practically making it a mostly privileged mapping but from which user running at EL0 can still execute. The downside, however, is that the kernel at EL1 inadvertently reading such mapping would not trip over the PAN (privileged access never) protection. Revert the relevant bits from commit cab15ce604e5 ("arm64: Introduce execute-only page access permissions") so that PROT_EXEC implies PROT_READ (and therefore PTE_USER) until the architecture gains proper support for execute-only user mappings. Fixes: cab15ce604e5 ("arm64: Introduce execute-only page access permissions") Cc: <stable@vger.kernel.org> # 4.9.x- Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-09riscv: ftrace: correct the condition logic in function graph tracerZong Li1-1/+1
commit 1d8f65798240b6577d8c44d20c8ea8f1d429e495 upstream. The condition should be logical NOT to assign the hook address to parent address. Because the return value 0 of function_graph_enter upon success. Fixes: e949b6db51dc (riscv/function_graph: Simplify with function_graph_enter()) Signed-off-by: Zong Li <zong.li@sifive.com> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: stable@vger.kernel.org Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-09MIPS: Avoid VDSO ABI breakage due to global register variablePaul Burton1-1/+19
commit bbcc5672b0063b0e9d65dc8787a4f09c3b5bb5cc upstream. Declaring __current_thread_info as a global register variable has the effect of preventing GCC from saving & restoring its value in cases where the ABI would typically do so. To quote GCC documentation: > If the register is a call-saved register, call ABI is affected: the > register will not be restored in function epilogue sequences after the > variable has been assigned. Therefore, functions cannot safely return > to callers that assume standard ABI. When our position independent VDSO is built for the n32 or n64 ABIs all functions it exposes should be preserving the value of $gp/$28 for their caller, but in the presence of the __current_thread_info global register variable GCC stops doing so & simply clobbers $gp/$28 when calculating the address of the GOT. In cases where the VDSO returns success this problem will typically be masked by the caller in libc returning & restoring $gp/$28 itself, but that is by no means guaranteed. In cases where the VDSO returns an error libc will typically contain a fallback path which will now fail (typically with a bad memory access) if it attempts anything which relies upon the value of $gp/$28 - eg. accessing anything via the GOT. One fix for this would be to move the declaration of __current_thread_info inside the current_thread_info() function, demoting it from global register variable to local register variable & avoiding inadvertently creating a non-standard calling ABI for the VDSO. Unfortunately this causes issues for clang, which doesn't support local register variables as pointed out by commit fe92da0f355e ("MIPS: Changed current_thread_info() to an equivalent supported by both clang and GCC") which introduced the global register variable before we had a VDSO to worry about. Instead, fix this by continuing to use the global register variable for the kernel proper but declare __current_thread_info as a simple extern variable when building the VDSO. It should never be referenced, and will cause a link error if it is. This resolves the calling convention issue for the VDSO without having any impact upon the build of the kernel itself for either clang or gcc. Signed-off-by: Paul Burton <paulburton@kernel.org> Fixes: ebb5e78cc634 ("MIPS: Initial implementation of a VDSO") Reported-by: Jason A. Donenfeld <Jason@zx2c4.com> Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com> Tested-by: Jason A. Donenfeld <Jason@zx2c4.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christian Brauner <christian.brauner@canonical.com> Cc: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: <stable@vger.kernel.org> # v4.4+ Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-09s390/cpum_sf: Avoid SBD overflow condition in irq handlerThomas Richter1-6/+0
[ Upstream commit 0539ad0b22877225095d8adef0c376f52cc23834 ] The s390 CPU Measurement sampling facility has an overflow condition which fires when all entries in a SBD are used. The measurement alert interrupt is triggered and reads out all samples in this SDB. It then tests the successor SDB, if this SBD is not full, the interrupt handler does not read any samples at all from this SDB The design waits for the hardware to fill this SBD and then trigger another meassurement alert interrupt. This scheme works nicely until an perf_event_overflow() function call discards the sample due to a too high sampling rate. The interrupt handler has logic to read out a partially filled SDB when the perf event overflow condition in linux common code is met. This causes the CPUM sampling measurement hardware and the PMU device driver to operate on the same SBD's trailer entry. This should not happen. This can be seen here using this trace: cpumsf_pmu_add: tear:0xb5286000 hw_perf_event_update: sdbt 0xb5286000 full 1 over 0 flush_all:0 hw_perf_event_update: sdbt 0xb5286008 full 0 over 0 flush_all:0 above shows 1. interrupt hw_perf_event_update: sdbt 0xb5286008 full 1 over 0 flush_all:0 hw_perf_event_update: sdbt 0xb5286008 full 0 over 0 flush_all:0 above shows 2. interrupt ... this goes on fine until... hw_perf_event_update: sdbt 0xb5286068 full 1 over 0 flush_all:0 perf_push_sample1: overflow one or more samples read from the IRQ handler are rejected by perf_event_overflow() and the IRQ handler advances to the next SDB and modifies the trailer entry of a partially filled SDB. hw_perf_event_update: sdbt 0xb5286070 full 0 over 0 flush_all:1 timestamp: 14:32:52.519953 Next time the IRQ handler is called for this SDB the trailer entry shows an overflow count of 19 missed entries. hw_perf_event_update: sdbt 0xb5286070 full 1 over 19 flush_all:1 timestamp: 14:32:52.970058 Remove access to a follow on SDB when event overflow happened. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-09s390/cpum_sf: Adjust sampling interval to avoid hitting sample limitsThomas Richter1-0/+16
[ Upstream commit 39d4a501a9ef55c57b51e3ef07fc2aeed7f30b3b ] Function perf_event_ever_overflow() and perf_event_account_interrupt() are called every time samples are processed by the interrupt handler. However function perf_event_account_interrupt() has checks to avoid being flooded with interrupts (more then 1000 samples are received per task_tick). Samples are then dropped and a PERF_RECORD_THROTTLED is added to the perf data. The perf subsystem limit calculation is: maximum sample frequency := 100000 --> 1 samples per 10 us task_tick = 10ms = 10000us --> 1000 samples per task_tick The work flow is measurement_alert() uses SDBT head and each SBDT points to 511 SDB pages, each with 126 sample entries. After processing 8 SBDs and for each valid sample calling: perf_event_overflow() perf_event_account_interrupts() there is a considerable amount of samples being dropped, especially when the sample frequency is very high and near the 100000 limit. To avoid the high amount of samples being dropped near the end of a task_tick time frame, increment the sampling interval in case of dropped events. The CPU Measurement sampling facility on the s390 supports only intervals, specifiing how many CPU cycles have to be executed before a sample is generated. Increase the interval when the samples being generated hit the task_tick limit. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04x86/mce: Fix possibly incorrect severity calculation on AMDJan H. Schönherr1-1/+1
[ Upstream commit a3a57ddad061acc90bef39635caf2b2330ce8f21 ] The function mce_severity_amd_smca() requires m->bank to be initialized for correct operation. Fix the one case, where mce_severity() is called without doing so. Fixes: 6bda529ec42e ("x86/mce: Grade uncorrected errors for SMCA-enabled systems") Fixes: d28af26faa0b ("x86/MCE: Initialize mce.bank in the case of a fatal error in mce_no_way_out()") Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: linux-edac <linux-edac@vger.kernel.org> Cc: <stable@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Cc: Yazen Ghannam <Yazen.Ghannam@amd.com> Link: https://lkml.kernel.org/r/20191210000733.17979-4-jschoenh@amazon.de Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04Revert "powerpc/vcpu: Assume dedicated processors as non-preempt"Greg Kroah-Hartman2-10/+1
This reverts commit 4ba32bdbd8c66d9c7822aea8dcf4e51410df84a8 which is commit 14c73bd344da60abaf7da3ea2e7733ddda35bbac upstream. It breaks the build. Cc: Guenter Roeck <linux@roeck-us.net> Cc: Parth Shah <parth@linux.ibm.com> Cc: Ihor Pasichnyk <Ihor.Pasichnyk@ibm.com> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Waiman Long <longman@redhat.com> Cc: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Phil Auld <pauld@redhat.com> Cc: Vaidyanathan Srinivasan <svaidy@linux.ibm.com> Cc: Parth Shah <parth@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-04s390/cpum_sf: Check for SDBT and SDB consistencyThomas Richter1-2/+15
[ Upstream commit 247f265fa502e7b17a0cb0cc330e055a36aafce4 ] Each SBDT is located at a 4KB page and contains 512 entries. Each entry of a SDBT points to a SDB, a 4KB page containing sampled data. The last entry is a link to another SDBT page. When an event is created the function sequence executed is: __hw_perf_event_init() +--> allocate_buffers() +--> realloc_sampling_buffers() +---> alloc_sample_data_block() Both functions realloc_sampling_buffers() and alloc_sample_data_block() allocate pages and the allocation can fail. This is handled correctly and all allocated pages are freed and error -ENOMEM is returned to the top calling function. Finally the event is not created. Once the event has been created, the amount of initially allocated SDBT and SDB can be too low. This is detected during measurement interrupt handling, where the amount of lost samples is calculated. If the number of lost samples is too high considering sampling frequency and already allocated SBDs, the number of SDBs is enlarged during the next execution of cpumsf_pmu_enable(). If more SBDs need to be allocated, functions realloc_sampling_buffers() +---> alloc-sample_data_block() are called to allocate more pages. Page allocation may fail and the returned error is ignored. A SDBT and SDB setup already exists. However the modified SDBTs and SDBs might end up in a situation where the first entry of an SDBT does not point to an SDB, but another SDBT, basicly an SBDT without payload. This can not be handled by the interrupt handler, where an SDBT must have at least one entry pointing to an SBD. Add a check to avoid SDBTs with out payload (SDBs) when enlarging the buffer setup. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04libfdt: define INT32_MAX and UINT32_MAX in libfdt_env.hMasahiro Yamada2-1/+5
[ Upstream commit a8de1304b7df30e3a14f2a8b9709bb4ff31a0385 ] The DTC v1.5.1 added references to (U)INT32_MAX. This is no problem for user-space programs since <stdint.h> defines (U)INT32_MAX along with (u)int32_t. For the kernel space, libfdt_env.h needs to be adjusted before we pull in the changes. In the kernel, we usually use s/u32 instead of (u)int32_t for the fixed-width types. Accordingly, we already have S/U32_MAX for their max values. So, we should not add (U)INT32_MAX to <linux/limits.h> any more. Instead, add them to the in-kernel libfdt_env.h to compile the latest libfdt. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Rob Herring <robh@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc: Don't add -mabi= flags when building with ClangNathan Chancellor1-0/+4
[ Upstream commit 465bfd9c44dea6b55962b5788a23ac87a467c923 ] When building pseries_defconfig, building vdso32 errors out: error: unknown target ABI 'elfv1' This happens because -m32 in clang changes the target to 32-bit, which does not allow the ABI to be changed. Commit 4dc831aa8813 ("powerpc: Fix compiling a BE kernel with a powerpc64le toolchain") added these flags to fix building big endian kernels with a little endian GCC. Clang doesn't need -mabi because the target triple controls the default value. -mlittle-endian and -mbig-endian manipulate the triple into either powerpc64-* or powerpc64le-*, which properly sets the default ABI. Adding a debug print out in the PPC64TargetInfo constructor after line 383 above shows this: $ echo | ./clang -E --target=powerpc64-linux -mbig-endian -o /dev/null - Default ABI: elfv1 $ echo | ./clang -E --target=powerpc64-linux -mlittle-endian -o /dev/null - Default ABI: elfv2 $ echo | ./clang -E --target=powerpc64le-linux -mbig-endian -o /dev/null - Default ABI: elfv1 $ echo | ./clang -E --target=powerpc64le-linux -mlittle-endian -o /dev/null - Default ABI: elfv2 Don't specify -mabi when building with clang to avoid the build error with -m32 and not change any code generation. -mcall-aixdesc is not an implemented flag in clang so it can be safely excluded as well, see commit 238abecde8ad ("powerpc: Don't use gcc specific options on clang"). pseries_defconfig successfully builds after this patch and powernv_defconfig and ppc44x_defconfig don't regress. Reviewed-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> [mpe: Trim clang links in change log] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191119045712.39633-2-natechancellor@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04ARM: 8937/1: spectre-v2: remove Brahma-B53 from hardeningDoug Berger1-0/+3
[ Upstream commit 4ae5061a19b550dfe25397843427ed2ebab16b16 ] When the default processor handling was added to the function cpu_v7_spectre_init() it only excluded other ARM implemented processor cores. The Broadcom Brahma B53 core is not implemented by ARM so it ended up falling through into the set of processors that attempt to use the ARM_SMCCC_ARCH_WORKAROUND_1 service to harden the branch predictor. Since this workaround is not necessary for the Brahma-B53 this commit explicitly checks for it and prevents it from applying a branch predictor hardening workaround. Fixes: 10115105cb3a ("ARM: spectre-v2: add firmware based hardening") Signed-off-by: Doug Berger <opendmb@gmail.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/security: Fix wrong message when RFI Flush is disableGustavo L. F. Walbon1-10/+6
[ Upstream commit 4e706af3cd8e1d0503c25332b30cad33c97ed442 ] The issue was showing "Mitigation" message via sysfs whatever the state of "RFI Flush", but it should show "Vulnerable" when it is disabled. If you have "L1D private" feature enabled and not "RFI Flush" you are vulnerable to meltdown attacks. "RFI Flush" is the key feature to mitigate the meltdown whatever the "L1D private" state. SEC_FTR_L1D_THREAD_PRIV is a feature for Power9 only. So the message should be as the truth table shows: CPU | L1D private | RFI Flush | sysfs ----|-------------|-----------|------------------------------------- P9 | False | False | Vulnerable P9 | False | True | Mitigation: RFI Flush P9 | True | False | Vulnerable: L1D private per thread P9 | True | True | Mitigation: RFI Flush, L1D private per thread P8 | False | False | Vulnerable P8 | False | True | Mitigation: RFI Flush Output before this fix: # cat /sys/devices/system/cpu/vulnerabilities/meltdown Mitigation: RFI Flush, L1D private per thread # echo 0 > /sys/kernel/debug/powerpc/rfi_flush # cat /sys/devices/system/cpu/vulnerabilities/meltdown Mitigation: L1D private per thread Output after fix: # cat /sys/devices/system/cpu/vulnerabilities/meltdown Mitigation: RFI Flush, L1D private per thread # echo 0 > /sys/kernel/debug/powerpc/rfi_flush # cat /sys/devices/system/cpu/vulnerabilities/meltdown Vulnerable: L1D private per thread Signed-off-by: Gustavo L. F. Walbon <gwalbon@linux.ibm.com> Signed-off-by: Mauro S. M. Rodrigues <maurosr@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190502210907.42375-1-gwalbon@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/pseries/cmm: Implement release() function for sysfs deviceDavid Hildenbrand1-0/+5
[ Upstream commit 7d8212747435c534c8d564fbef4541a463c976ff ] When unloading the module, one gets ------------[ cut here ]------------ Device 'cmm0' does not have a release() function, it is broken and must be fixed. See Documentation/kobject.txt. WARNING: CPU: 0 PID: 19308 at drivers/base/core.c:1244 .device_release+0xcc/0xf0 ... We only have one static fake device. There is nothing to do when releasing the device (via cmm_exit()). Signed-off-by: David Hildenbrand <david@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191031142933.10779-2-david@redhat.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/book3s64/hash: Add cond_resched to avoid soft lockup warningAneesh Kumar K.V1-0/+1
[ Upstream commit 16f6b67cf03cb43db7104acb2ca877bdc2606c92 ] With large memory (8TB and more) hotplug, we can get soft lockup warnings as below. These were caused by a long loop without any explicit cond_resched which is a problem for !PREEMPT kernels. Avoid this using cond_resched() while inserting hash page table entries. We already do similar cond_resched() in __add_pages(), see commit f64ac5e6e306 ("mm, memory_hotplug: add scheduling point to __add_pages"). rcu: 3-....: (24002 ticks this GP) idle=13e/1/0x4000000000000002 softirq=722/722 fqs=12001 (t=24003 jiffies g=4285 q=2002) NMI backtrace for cpu 3 CPU: 3 PID: 3870 Comm: ndctl Not tainted 5.3.0-197.18-default+ #2 Call Trace: dump_stack+0xb0/0xf4 (unreliable) nmi_cpu_backtrace+0x124/0x130 nmi_trigger_cpumask_backtrace+0x1ac/0x1f0 arch_trigger_cpumask_backtrace+0x28/0x3c rcu_dump_cpu_stacks+0xf8/0x154 rcu_sched_clock_irq+0x878/0xb40 update_process_times+0x48/0x90 tick_sched_handle.isra.16+0x4c/0x80 tick_sched_timer+0x68/0xe0 __hrtimer_run_queues+0x180/0x430 hrtimer_interrupt+0x110/0x300 timer_interrupt+0x108/0x2f0 decrementer_common+0x114/0x120 --- interrupt: 901 at arch_add_memory+0xc0/0x130 LR = arch_add_memory+0x74/0x130 memremap_pages+0x494/0x650 devm_memremap_pages+0x3c/0xa0 pmem_attach_disk+0x188/0x750 nvdimm_bus_probe+0xac/0x2c0 really_probe+0x148/0x570 driver_probe_device+0x19c/0x1d0 device_driver_attach+0xcc/0x100 bind_store+0x134/0x1c0 drv_attr_store+0x44/0x60 sysfs_kf_write+0x64/0x90 kernfs_fop_write+0x1a0/0x270 __vfs_write+0x3c/0x70 vfs_write+0xd0/0x260 ksys_write+0xdc/0x130 system_call+0x5c/0x68 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191001084656.31277-1-aneesh.kumar@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/security/book3s64: Report L1TF status in sysfsAnthony Steinhauser1-0/+5
[ Upstream commit 8e6b6da91ac9b9ec5a925b6cb13f287a54bd547d ] Some PowerPC CPUs are vulnerable to L1TF to the same extent as to Meltdown. It is also mitigated by flushing the L1D on privilege transition. Currently the sysfs gives a false negative on L1TF on CPUs that I verified to be vulnerable, a Power9 Talos II Boston 004e 1202, PowerNV T2P9D01. Signed-off-by: Anthony Steinhauser <asteinhauser@google.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> [mpe: Just have cpu_show_l1tf() call cpu_show_meltdown() directly] Link: https://lore.kernel.org/r/20191029190759.84821-1-asteinhauser@google.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/tools: Don't quote $objdump in scriptsMichael Ellerman2-3/+3
[ Upstream commit e44ff9ea8f4c8a90c82f7b85bd4f5e497c841960 ] Some of our scripts are passed $objdump and then call it as "$objdump". This doesn't work if it contains spaces because we're using ccache, for example you get errors such as: ./arch/powerpc/tools/relocs_check.sh: line 48: ccache ppc64le-objdump: No such file or directory ./arch/powerpc/tools/unrel_branch_check.sh: line 26: ccache ppc64le-objdump: No such file or directory Fix it by not quoting the string when we expand it, allowing the shell to do the right thing for us. Fixes: a71aa05e1416 ("powerpc: Convert relocs_check to a shell script using grep") Fixes: 4ea80652dc75 ("powerpc/64s: Tool to flag direct branches from unrelocated interrupt vectors") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191024004730.32135-1-mpe@ellerman.id.au Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/pseries: Don't fail hash page table insert for bolted mappingAneesh Kumar K.V1-1/+8
[ Upstream commit 75838a3290cd4ebbd1f567f310ba04b6ef017ce4 ] If the hypervisor returned H_PTEG_FULL for H_ENTER hcall, retry a hash page table insert by removing a random entry from the group. After some runtime, it is very well possible to find all the 8 hash page table entry slot in the hpte group used for mapping. Don't fail a bolted entry insert in that case. With Storage class memory a user can find this error easily since a namespace enable/disable is equivalent to memory add/remove. This results in failures as reported below: $ ndctl create-namespace -r region1 -t pmem -m devdax -a 65536 -s 100M libndctl: ndctl_dax_enable: dax1.3: failed to enable Error: namespace1.2: failed to enable failed to create namespace: No such device or address In kernel log we find the details as below: Unable to create mapping for hot added memory 0xc000042006000000..0xc00004200d000000: -1 dax_pmem: probe of dax1.3 failed with error -14 This indicates that we failed to create a bolted hash table entry for direct-map address backing the namespace. We also observe failures such that not all namespaces will be enabled with ndctl enable-namespace all command. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191024093542.29777-2-aneesh.kumar@linux.ibm.com Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-01-04powerpc/pseries: Mark accumulate_stolen_time() as notraceMichael Ellerman1-1/+1
[ Upstream commit eb8e20f89093b64f48975c74ccb114e6775cee22 ] accumulate_stolen_time() is called prior to interrupt state being reconciled, which can trip the warning in arch_local_irq_restore(): WARNING: CPU: 5 PID: 1017 at arch/powerpc/kernel/irq.c:258 .arch_local_irq_restore+0x9c/0x130 ... NIP .arch_local_irq_restore+0x9c/0x130 LR .rb_start_commit+0x38/0x80 Call Trace: .ring_buffer_lock_reserve+0xe4/0x620 .trace_function+0x44/0x210 .function_trace_call+0x148/0x170 .ftrace_ops_no_ops+0x180/0x1d0 ftrace_call+0x4/0x8 .accumulate_stolen_time+0x1c/0xb0 decrementer_common+0x124/0x160 For now just mark it as notrace. We may change the ordering to call it after interrupt state has been reconciled, but that is a larger change. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191024055932.27940-1-mpe@ellerman.id.au Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-12-31powerpc/irq: fix stack overflow verificationChristophe Leroy1-2/+2
commit 099bc4812f09155da77eeb960a983470249c9ce1 upstream. Before commit 0366a1c70b89 ("powerpc/irq: Run softirqs off the top of the irq stack"), check_stack_overflow() was called by do_IRQ(), before switching to the irq stack. In that commit, do_IRQ() was renamed __do_irq(), and is now executing on the irq stack, so check_stack_overflow() has just become almost useless. Move check_stack_overflow() call in do_IRQ() to do the check while still on the current stack. Fixes: 0366a1c70b89 ("powerpc/irq: Run softirqs off the top of the irq stack") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/e033aa8116ab12b7ca9a9c75189ad0741e3b9b5f.1575872340.git.christophe.leroy@c-s.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-31powerpc/vcpu: Assume dedicated processors as non-preemptSrikar Dronamraju2-1/+10
commit 14c73bd344da60abaf7da3ea2e7733ddda35bbac upstream. With commit 247f2f6f3c70 ("sched/core: Don't schedule threads on pre-empted vCPUs"), the scheduler avoids preempted vCPUs to schedule tasks on wakeup. This leads to wrong choice of CPU, which in-turn leads to larger wakeup latencies. Eventually, it leads to performance regression in latency sensitive benchmarks like soltp, schbench etc. On Powerpc, vcpu_is_preempted() only looks at yield_count. If the yield_count is odd, the vCPU is assumed to be preempted. However yield_count is increased whenever the LPAR enters CEDE state (idle). So any CPU that has entered CEDE state is assumed to be preempted. Even if vCPU of dedicated LPAR is preempted/donated, it should have right of first-use since they are supposed to own the vCPU. On a Power9 System with 32 cores: # lscpu Architecture: ppc64le Byte Order: Little Endian CPU(s): 128 On-line CPU(s) list: 0-127 Thread(s) per core: 8 Core(s) per socket: 1 Socket(s): 16 NUMA node(s): 2 Model: 2.2 (pvr 004e 0202) Model name: POWER9 (architected), altivec supported Hypervisor vendor: pHyp Virtualization type: para L1d cache: 32K L1i cache: 32K L2 cache: 512K L3 cache: 10240K NUMA node0 CPU(s): 0-63 NUMA node1 CPU(s): 64-127 # perf stat -a -r 5 ./schbench v5.4 v5.4 + patch Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 45 75.0000th: 62 75.0th: 63 90.0000th: 71 90.0th: 74 95.0000th: 77 95.0th: 78 *99.0000th: 91 *99.0th: 82 99.5000th: 707 99.5th: 83 99.9000th: 6920 99.9th: 86 min=0, max=10048 min=0, max=96 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 46 75.0000th: 61 75.0th: 64 90.0000th: 72 90.0th: 75 95.0000th: 79 95.0th: 79 *99.0000th: 691 *99.0th: 83 99.5000th: 3972 99.5th: 85 99.9000th: 8368 99.9th: 91 min=0, max=16606 min=0, max=117 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 46 75.0000th: 61 75.0th: 64 90.0000th: 71 90.0th: 75 95.0000th: 77 95.0th: 79 *99.0000th: 106 *99.0th: 83 99.5000th: 2364 99.5th: 84 99.9000th: 7480 99.9th: 90 min=0, max=10001 min=0, max=95 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 45 50.0th: 47 75.0000th: 62 75.0th: 65 90.0000th: 72 90.0th: 75 95.0000th: 78 95.0th: 79 *99.0000th: 93 *99.0th: 84 99.5000th: 108 99.5th: 85 99.9000th: 6792 99.9th: 90 min=0, max=17681 min=0, max=117 Latency percentiles (usec) Latency percentiles (usec) 50.0000th: 46 50.0th: 45 75.0000th: 62 75.0th: 64 90.0000th: 73 90.0th: 75 95.0000th: 79 95.0th: 79 *99.0000th: 113 *99.0th: 82 99.5000th: 2724 99.5th: 83 99.9000th: 6184 99.9th: 93 min=0, max=9887 min=0, max=111 Performance counter stats for 'system wide' (5 runs): context-switches 43,373 ( +- 0.40% ) 44,597 ( +- 0.55% ) cpu-migrations 1,211 ( +- 5.04% ) 220 ( +- 6.23% ) page-faults 15,983 ( +- 5.21% ) 15,360 ( +- 3.38% ) Waiman Long suggested using static_keys. Fixes: 247f2f6f3c70 ("sched/core: Don't schedule threads on pre-empted vCPUs") Cc: stable@vger.kernel.org # v4.18+ Reported-by: Parth Shah <parth@linux.ibm.com> Reported-by: Ihor Pasichnyk <Ihor.Pasichnyk@ibm.com> Tested-by: Juri Lelli <juri.lelli@redhat.com> Acked-by: Waiman Long <longman@redhat.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Phil Auld <pauld@redhat.com> Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com> Tested-by: Parth Shah <parth@linux.ibm.com> [mpe: Move the key and setting of the key to pseries/setup.c] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191213035036.6913-1-mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-31x86/MCE/AMD: Allow Reserved types to be overwritten in smca_banks[]Yazen Ghannam1-1/+1
commit 966af20929ac24360ba3fac5533eb2ab003747da upstream. Each logical CPU in Scalable MCA systems controls a unique set of MCA banks in the system. These banks are not shared between CPUs. The bank types and ordering will be the same across CPUs on currently available systems. However, some CPUs may see a bank as Reserved/Read-as-Zero (RAZ) while other CPUs do not. In this case, the bank seen as Reserved on one CPU is assumed to be the same type as the bank seen as a known type on another CPU. In general, this occurs when the hardware represented by the MCA bank is disabled, e.g. disabled memory controllers on certain models, etc. The MCA bank is disabled in the hardware, so there is no possibility of getting an MCA/MCE from it even if it is assumed to have a known type. For example: Full system: Bank | Type seen on CPU0 | Type seen on CPU1 ------------------------------------------------ 0 | LS | LS 1 | UMC | UMC 2 | CS | CS System with hardware disabled: Bank | Type seen on CPU0 | Type seen on CPU1 ------------------------------------------------ 0 | LS | LS 1 | UMC | RAZ 2 | CS | CS For this reason, there is a single, global struct smca_banks[] that is initialized at boot time. This array is initialized on each CPU as it comes online. However, the array will not be updated if an entry already exists. This works as expected when the first CPU (usually CPU0) has all possible MCA banks enabled. But if the first CPU has a subset, then it will save a "Reserved" type in smca_banks[]. Successive CPUs will then not be able to update smca_banks[] even if they encounter a known bank type. This may result in unexpected behavior. Depending on the system configuration, a user may observe issues enumerating the MCA thresholding sysfs interface. The issues may be as trivial as sysfs entries not being available, or as severe as system hangs. For example: Bank | Type seen on CPU0 | Type seen on CPU1 ------------------------------------------------ 0 | LS | LS 1 | RAZ | UMC 2 | CS | CS Extend the smca_banks[] entry check to return if the entry is a non-reserved type. Otherwise, continue so that CPUs that encounter a known bank type can update smca_banks[]. Fixes: 68627a697c19 ("x86/mce/AMD, EDAC/mce_amd: Enumerate Reserved SMCA bank type") Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: linux-edac <linux-edac@vger.kernel.org> Cc: <stable@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20191121141508.141273-1-Yazen.Ghannam@amd.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-31x86/MCE/AMD: Do not use rdmsr_safe_on_cpu() in smca_configure()Konstantin Khlebnikov1-1/+1
commit 246ff09f89e54fdf740a8d496176c86743db3ec7 upstream. ... because interrupts are disabled that early and sending IPIs can deadlock: BUG: sleeping function called from invalid context at kernel/sched/completion.c:99 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1 no locks held by swapper/1/0. irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [<ffffffff8106dda9>] copy_process+0x8b9/0x1ca0 softirqs last enabled at (0): [<ffffffff8106dda9>] copy_process+0x8b9/0x1ca0 softirqs last disabled at (0): [<0000000000000000>] 0x0 Preemption disabled at: [<ffffffff8104703b>] start_secondary+0x3b/0x190 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc2+ #1 Hardware name: GIGABYTE MZ01-CE1-00/MZ01-CE1-00, BIOS F02 08/29/2018 Call Trace: dump_stack ___might_sleep.cold.92 wait_for_completion ? generic_exec_single rdmsr_safe_on_cpu ? wrmsr_on_cpus mce_amd_feature_init mcheck_cpu_init identify_cpu identify_secondary_cpu smp_store_cpu_info start_secondary secondary_startup_64 The function smca_configure() is called only on the current CPU anyway, therefore replace rdmsr_safe_on_cpu() with atomic rdmsr_safe() and avoid the IPI. [ bp: Update commit message. ] Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-edac <linux-edac@vger.kernel.org> Cc: <stable@vger.kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/157252708836.3876.4604398213417262402.stgit@buzz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-31KVM: arm64: Ensure 'params' is initialised when looking up sys registerWill Deacon1-1/+4
commit 1ce74e96c2407df2b5867e5d45a70aacb8923c14 upstream. Commit 4b927b94d5df ("KVM: arm/arm64: vgic: Introduce find_reg_by_id()") introduced 'find_reg_by_id()', which looks up a system register only if the 'id' index parameter identifies a valid system register. As part of the patch, existing callers of 'find_reg()' were ported over to the new interface, but this breaks 'index_to_sys_reg_desc()' in the case that the initial lookup in the vCPU target table fails because we will then call into 'find_reg()' for the system register table with an uninitialised 'param' as the key to the lookup. GCC 10 is bright enough to spot this (amongst a tonne of false positives, but hey!): | arch/arm64/kvm/sys_regs.c: In function ‘index_to_sys_reg_desc.part.0.isra’: | arch/arm64/kvm/sys_regs.c:983:33: warning: ‘params.Op2’ may be used uninitialized in this function [-Wmaybe-uninitialized] | 983 | (u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2); | [...] Revert the hunk of 4b927b94d5df which breaks 'index_to_sys_reg_desc()' so that the old behaviour of checking the index upfront is restored. Fixes: 4b927b94d5df ("KVM: arm/arm64: vgic: Introduce find_reg_by_id()") Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20191212094049.12437-1-will@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-31s390/ftrace: fix endless recursion in function_graph tracerSven Schnelle1-2/+2
[ Upstream commit 6feeee8efc53035c3195b02068b58ae947538aa4 ] The following sequence triggers a kernel stack overflow on s390x: mount -t tracefs tracefs /sys/kernel/tracing cd /sys/kernel/tracing echo function_graph > current_tracer [crash] This is because preempt_count_{add,sub} are in the list of traced functions, which can be demonstrated by: echo preempt_count_add >set_ftrace_filter echo function_graph > current_tracer [crash] The stack overflow happens because get_tod_clock_monotonic() gets called by ftrace but itself calls preempt_{disable,enable}(), which leads to a endless recursion. Fix this by using preempt_{disable,enable}_notrace(). Fixes: 011620688a71 ("s390/time: ensure get_clock_monotonic() returns monotonic values") Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-12-31mips: fix build when "48 bits virtual memory" is enabledMike Rapoport1-2/+7
[ Upstream commit 3ed6751bb8fa89c3014399bb0414348499ee202a ] With CONFIG_MIPS_VA_BITS_48=y the build fails miserably: CC arch/mips/kernel/asm-offsets.s In file included from arch/mips/include/asm/pgtable.h:644, from include/linux/mm.h:99, from arch/mips/kernel/asm-offsets.c:15: include/asm-generic/pgtable.h:16:2: error: #error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED #error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED ^~~~~ include/asm-generic/pgtable.h:390:28: error: unknown type name 'p4d_t'; did you mean 'pmd_t'? static inline int p4d_same(p4d_t p4d_a, p4d_t p4d_b) ^~~~~ pmd_t [ ... more such errors ... ] scripts/Makefile.build:99: recipe for target 'arch/mips/kernel/asm-offsets.s' failed make[2]: *** [arch/mips/kernel/asm-offsets.s] Error 1 This happens because when CONFIG_MIPS_VA_BITS_48 enables 4th level of the page tables, but neither pgtable-nop4d.h nor 5level-fixup.h are included to cope with the 5th level. Replace #ifdef conditions around includes of the pgtable-nop{m,u}d.h with explicit CONFIG_PGTABLE_LEVELS and add include of 5level-fixup.h for the case when CONFIG_PGTABLE_LEVELS==4 Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org Cc: Mike Rapoport <rppt@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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