- 30 Jul, 2018 2 commits
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Pavel Tatashin authored
sched_clock_init() used be called early during boot when interrupts were still disabled. After the recent changes to utilize sched clock early the sched_clock_init() call happens when interrupts are already enabled, which triggers the following warning: WARNING: CPU: 0 PID: 0 at kernel/time/sched_clock.c:180 sched_clock_register+0x44/0x278 [<c001a13c>] (warn_slowpath_null) from [<c052367c>] (sched_clock_register+0x44/0x278) [<c052367c>] (sched_clock_register) from [<c05238d8>] (generic_sched_clock_init+0x28/0x88) [<c05238d8>] (generic_sched_clock_init) from [<c0521a00>] (sched_clock_init+0x54/0x74) [<c0521a00>] (sched_clock_init) from [<c0519c18>] (start_kernel+0x310/0x3e4) [<c0519c18>] (start_kernel) from [<00000000>] ( (null)) Disable IRQs for the duration of generic_sched_clock_init(). Fixes: 857baa87 ("sched/clock: Enable sched clock early") Signed-off-by:
Pavel Tatashin <pasha.tatashin@oracle.com> Reported-by:
Guenter Roeck <linux@roeck-us.net> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Link: https://lkml.kernel.org/r/20180730135252.24599-1-pasha.tatashin@oracle.com
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Pavel Tatashin authored
On arches with no persistent clock a message like this is printed during boot: [ 0.000000] Persistent clock returned invalid value The value is not invalid: Zero means that no persistent clock is available and the absence of persistent clock should be quietly accepted. Fixes: 3eca9937 ("timekeeping: Replace read_boot_clock64() with read_persistent_wall_and_boot_offset()") Signed-off-by:
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- 20 Jul, 2018 1 commit
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Peter Zijlstra authored
All data required for the 'unstable' sched_clock must be set-up _before_ enabling it -- setting sched_clock_running. This includes the __gtod_offset but also a recent scd stamp. Make the gtod-offset update also set the csd stamp -- it requires the same two clock reads _anyway_. This doesn't hurt in the sched_clock_tick_stable() case and ensures sched_clock_init() gets everything set-up before use. Also switch to unconditional IRQ-disable/enable because the static key stuff already requires this is not ran with IRQs disabled. Fixes: 857baa87 ("sched/clock: Enable sched clock early") Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
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- 19 Jul, 2018 31 commits
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Pavel Tatashin authored
During early boot enable tsc_calibrate_cpu_early() and switch to tsc_calibrate_cpu() only later. Do this unconditionally, because it is unknown what methods other cpus will use to calibrate once they are onlined. If by the time tsc_init() is called tsc frequency is still unknown do only pit_hpet_ptimer_calibrate_cpu() to calibrate, as this function contains the only methods wich have not been called and tried earlier. Signed-off-by:
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Pavel Tatashin authored
During early boot TSC and CPU frequency can be calibrated using MSR, CPUID, and quick PIT calibration methods. The other methods PIT/HPET/PMTIMER are available only after ACPI is initialized. Split native_calibrate_cpu() into early and late parts so they can be called separately during early and late tsc calibration. Signed-off-by:
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Pavel Tatashin authored
sched_clock_running may be read every time sched_clock_cpu() is called. Yet, this variable is updated only twice during boot, and never changes again, therefore it is better to make it a static key. Signed-off-by:
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Pavel Tatashin authored
Allow sched_clock() to be used before schec_clock_init() is called. This provides a way to get early boot timestamps on machines with unstable clocks. Signed-off-by:
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Pavel Tatashin authored
sched_clock_postinit() initializes a generic clock on systems where no other clock is provided. This function may be called only after timekeeping_init(). Rename sched_clock_postinit to generic_clock_inti() and call it from sched_clock_init(). Move the call for sched_clock_init() until after time_init(). Suggested-by:
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Pavel Tatashin authored
All prerequesites for enabling TSC as sched clock early in the boot process are available now: - Early attempt of TSC calibration - Early availablity of static branch patching If TSC frequency can be established in the early calibration, enable the static key which switches sched clock to use TSC. [ tglx: Massaged changelog ] Signed-off-by:
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Pavel Tatashin authored
cyc2ns converts tsc to nanoseconds, and it is handled in a per-cpu data structure. Currently, the setup code for c2ns data for every possible CPU goes through the same sequence of calculations as for the boot CPU, but is based on the same tsc frequency as the boot CPU, and thus this is not necessary. Initialize the boot cpu when tsc frequency is determined. Copy the calculated data from the boot CPU to the other CPUs in tsc_init(). In addition do the following: - Remove unnecessary zeroing of c2ns data by removing cyc2ns_data_init() - Split set_cyc2ns_scale() into two functions, so set_cyc2ns_scale() can be called when system is up, and wraps around __set_cyc2ns_scale() that can be called directly when system is booting but avoids saving restoring IRQs and going and waking up from idle. Suggested-by:
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Pavel Tatashin authored
During boot tsc is calibrated twice: once in tsc_early_delay_calibrate(), and the second time in tsc_init(). Rename tsc_early_delay_calibrate() to tsc_early_init(), and rework it so the calibration is done only early, and make tsc_init() to use the values already determined in tsc_early_init(). Sometimes it is not possible to determine tsc early, as the subsystem that is required is not yet initialized, in such case try again later in tsc_init(). Suggested-by:
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Pavel Tatashin authored
read_boot_clock64() is deleted, and replaced with read_persistent_wall_and_boot_offset(). The default implementation of read_persistent_wall_and_boot_offset() provides a better fallback than the current stubs for read_boot_clock64() that arm has with no users, so remove the old code. Signed-off-by:
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Pavel Tatashin authored
read_boot_clock64() was replaced by read_persistent_wall_and_boot_offset() so remove it. Signed-off-by:
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Pavel Tatashin authored
read_persistent_wall_and_boot_offset() is called during boot to read both the persistent clock and also return the offset between the boot time and the value of persistent clock. Change the default boot_offset from zero to local_clock() so architectures, that do not have a dedicated boot_clock but have early sched_clock(), such as SPARCv9, x86, and possibly more will benefit from this change by getting a better and more consistent estimate of the boot time without need for an arch specific implementation. Signed-off-by:
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Pavel Tatashin authored
If architecture does not support exact boot time, it is challenging to estimate boot time without having a reference to the current persistent clock value. Yet, it cannot read the persistent clock time again, because this may lead to math discrepancies with the caller of read_boot_clock64() who have read the persistent clock at a different time. This is why it is better to provide two values simultaneously: the persistent clock value, and the boot time. Replace read_boot_clock64() with: read_persistent_wall_and_boot_offset(wall_time, boot_offset) Where wall_time is returned by read_persistent_clock() And boot_offset is wall_time - boot time, which defaults to 0. Signed-off-by:
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Pavel Tatashin authored
read_persistent_wall_and_boot_offset() will replace read_boot_clock64() because on some architectures it is more convenient to read both sources as one may depend on the other. For s390, implementation is the same as read_boot_clock64() but also calling and returning value of read_persistent_clock64() Signed-off-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Cc: pbonzini@redhat.com Link: https://lkml.kernel.org/r/20180719205545.16512-15-pasha.tatashin@oracle.com
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Pavel Tatashin authored
It is expected for sched_clock() to output data from 0, when system boots. Add an offset xen_sched_clock_offset (similarly how it is done in other hypervisors i.e. kvm_sched_clock_offset) to count sched_clock() from 0, when time is first initialized. Signed-off-by:
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Pavel Tatashin authored
In every hypervisor except for xen pv time ops are initialized in init_hypervisor_platform(). Xen PV domains initialize time ops in x86_init.paging.pagetable_init(), by calling xen_setup_shared_info() which is a poor design, as time is needed prior to memory allocator. xen_setup_shared_info() is called from two places: during boot, and after suspend. Split the content of xen_setup_shared_info() into three places: 1. add the clock relavent data into new xen pv init_platform vector, and set clock ops in there. 2. move xen_setup_vcpu_info_placement() to new xen_pv_guest_late_init() call. 3. Re-initializing parts of shared info copy to xen_pv_post_suspend() to be symmetric to xen_pv_pre_suspend Signed-off-by:
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Pavel Tatashin authored
Currently, the notsc kernel parameter disables the use of the TSC by sched_clock(). However, this parameter does not prevent the kernel from accessing tsc in other places. The only rationale to boot with notsc is to avoid timing discrepancies on multi-socket systems where TSC are not properly synchronized, and thus exclude TSC from being used for time keeping. But that prevents using TSC as sched_clock() as well, which is not necessary as the core sched_clock() implementation can handle non synchronized TSC based sched clocks just fine. However, there is another method to solve the above problem: booting with tsc=unstable parameter. This parameter allows sched_clock() to use TSC and just excludes it from timekeeping. So there is no real reason to keep notsc, but for compatibility reasons the parameter has to stay. Make it behave like 'tsc=unstable' instead. [ tglx: Massaged changelog ] Signed-off-by:
Dou Liyang <douly.fnst@cn.fujitsu.com> Reviewed-by:
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Borislav Petkov authored
Make it use the setup_* variants and have it be called only on the BSP and drop the call in generic_identify() - X86_FEATURE_NOPL will be replicated to the APs through the forced caps. Helps to keep the mess at a manageable level. Signed-off-by:
Borislav Petkov <bp@suse.de> Signed-off-by:
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Pavel Tatashin authored
Static branching is useful to runtime patch branches that are used in hot path, but are infrequently changed. The x86 clock framework is one example that uses static branches to setup the best clock during boot and never changes it again. It is desired to enable the TSC based sched clock early to allow fine grained boot time analysis early on. That requires the static branching functionality to be functional early as well. Static branching requires patching nop instructions, thus, arch_init_ideal_nops() must be called prior to jump_label_init(). Do all the necessary steps to call arch_init_ideal_nops() right after early_cpu_init(), which also allows to insert a call to jump_label_init() right after that. jump_label_init() will be called again from the generic init code, but the code is protected against reinitialization already. [ tglx: Massaged changelog ] Suggested-by:
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Pavel Tatashin authored
It supposed to be safe to modify static branches after jump_label_init(). But, because static key modifying code eventually calls text_poke() it can end up accessing a struct page which has not been initialized yet. Here is how to quickly reproduce the problem. Insert code like this into init/main.c: | +static DEFINE_STATIC_KEY_FALSE(__test); | asmlinkage __visible void __init start_kernel(void) | { | char *command_line; |@@ -587,6 +609,10 @@ asmlinkage __visible void __init start_kernel(void) | vfs_caches_init_early(); | sort_main_extable(); | trap_init(); |+ { |+ static_branch_enable(&__test); |+ WARN_ON(!static_branch_likely(&__test)); |+ } | mm_init(); The following warnings show-up: WARNING: CPU: 0 PID: 0 at arch/x86/kernel/alternative.c:701 text_poke+0x20d/0x230 RIP: 0010:text_poke+0x20d/0x230 Call Trace: ? text_poke_bp+0x50/0xda ? arch_jump_label_transform+0x89/0xe0 ? __jump_label_update+0x78/0xb0 ? static_key_enable_cpuslocked+0x4d/0x80 ? static_key_enable+0x11/0x20 ? start_kernel+0x23e/0x4c8 ? secondary_startup_64+0xa5/0xb0 ---[ end trace abdc99c031b8a90a ]--- If the code above is moved after mm_init(), no warning is shown, as struct pages are initialized during handover from memblock. Use text_poke_early() in static branching until early boot IRQs are enabled and from there switch to text_poke. Also, ensure text_poke() is never invoked when unitialized memory access may happen by using adding a !after_bootmem assertion. Signed-off-by: -
Thomas Gleixner authored
The previous removal of the memblock dependency from kvmclock introduced a static data array sized 64bytes * CONFIG_NR_CPUS. That's wasteful on large systems when kvmclock is not used. Replace it with: - A static page sized array of pvclock data. It's page sized because the pvclock data of the boot cpu is mapped into the VDSO so otherwise random other data would be exposed to the vDSO - A PER_CPU variable of pvclock data pointers. This is used to access the pcvlock data storage on each CPU. The setup is done in two stages: - Early boot stores the pointer to the static page for the boot CPU in the per cpu data. - In the preparatory stage of CPU hotplug assign either an element of the static array (when the CPU number is in that range) or allocate memory and initialize the per cpu pointer. Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Link: https://lkml.kernel.org/r/20180719205545.16512-8-pasha.tatashin@oracle.com
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Thomas Gleixner authored
There is no point to have this in the kvm code itself and call it from there. This can be called from an initcall and the parameter is cleared when the hypervisor is not KVM. Signed-off-by:
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Thomas Gleixner authored
The kvmclock parameter is init data and the other variables are not modified after init. Signed-off-by:
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Thomas Gleixner authored
- Cleanup the mrs write for wall clock. The type casts to (int) are sloppy because the wrmsr parameters are u32 and aside of that wrmsrl() already provides the high/low split for free. - Remove the pointless get_cpu()/put_cpu() dance from various functions. Either they are called during early init where CPU is guaranteed to be 0 or they are already called from non preemptible context where smp_processor_id() can be used safely - Simplify the convoluted check for kvmclock in the init function. - Mark the parameter parsing function __init. No point in keeping it around. - Convert to pr_info() Signed-off-by:
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Thomas Gleixner authored
The return value is pointless because the wrmsr cannot fail if KVM_FEATURE_CLOCKSOURCE or KVM_FEATURE_CLOCKSOURCE2 are set. kvm_register_clock() is only called locally so wants to be static. Signed-off-by:
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Thomas Gleixner authored
There is no requirement for wall_clock data to be page aligned or page sized. Signed-off-by:
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Pavel Tatashin authored
KVM clock is initialized later compared to other hypervisor clocks because it has a dependency on the memblock allocator. Bring it in line with other hypervisors by using memory from the BSS instead of allocating it. The benefits: - Remove ifdef from common code - Earlier availability of the clock - Remove dependency on memblock, and reduce code The downside: - Static allocation of the per cpu data structures sized NR_CPUS * 64byte Will be addressed in follow up patches. [ tglx: Split out from larger series ] Signed-off-by: -
Thomas Gleixner authored
Pick up upstream changes to avoid conflicts
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git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pciLinus Torvalds authored
Pull PCI fixes from Bjorn Helgaas: - Fix crashes that happen when PHY drivers are left disabled in the V3 Semiconductor, MediaTek, Faraday, Aardvark, DesignWare, Versatile, and X-Gene host controller drivers (Sergei Shtylyov) - Fix a NULL pointer dereference in the endpoint library configfs support (Kishon Vijay Abraham I) - Fix a race condition in Hyper-V IRQ handling (Dexuan Cui) * tag 'pci-v4.18-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: PCI: v3-semi: Fix I/O space page leak PCI: mediatek: Fix I/O space page leak PCI: faraday: Fix I/O space page leak PCI: aardvark: Fix I/O space page leak PCI: designware: Fix I/O space page leak PCI: versatile: Fix I/O space page leak PCI: xgene: Fix I/O space page leak PCI: OF: Fix I/O space page leak PCI: endpoint: Fix NULL pointer dereference error when CONFIGFS is disabled PCI: hv: Disable/enable IRQs rather than BH in hv_compose_msi_msg()
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull sound fixes from Takashi Iwai: "A rawmidi race fix and three trivial HD-audio quirks" * tag 'sound-4.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: hda/realtek - Yet another Clevo P950 quirk entry ALSA: rawmidi: Change resized buffers atomically ALSA: hda/realtek - Add Panasonic CF-SZ6 headset jack quirk ALSA: hda: add mute led support for HP ProBook 455 G5
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
Pull crypto fix from Herbert Xu: "This fixes an allocation error-path bug in af_alg discovered by syzkaller" * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: af_alg - Initialize sg_num_bytes in error code path
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: "Lots of fixes, here goes: 1) NULL deref in qtnfmac, from Gustavo A. R. Silva. 2) Kernel oops when fw download fails in rtlwifi, from Ping-Ke Shih. 3) Lost completion messages in AF_XDP, from Magnus Karlsson. 4) Correct bogus self-assignment in rhashtable, from Rishabh Bhatnagar. 5) Fix regression in ipv6 route append handling, from David Ahern. 6) Fix masking in __set_phy_supported(), from Heiner Kallweit. 7) Missing module owner set in x_tables icmp, from Florian Westphal. 8) liquidio's timeouts are HZ dependent, fix from Nicholas Mc Guire. 9) Link setting fixes for sh_eth and ravb, from Vladimir Zapolskiy. 10) Fix NULL deref when using chains in act_csum, from Davide Caratti. 11) XDP_REDIRECT needs to check if the interface is up and whether the MTU is sufficient. From Toshiaki Makita. 12) Net diag can do a double free when killing TCP_NEW_SYN_RECV connections, from Lorenzo Colitti. 13) nf_defrag in ipv6 can unnecessarily hold onto dst entries for a full minute, delaying device unregister. From Eric Dumazet. 14) Update MAC entries in the correct order in ixgbe, from Alexander Duyck. 15) Don't leave partial mangles bpf program in jit_subprogs, from Daniel Borkmann. 16) Fix pfmemalloc SKB state propagation, from Stefano Brivio. 17) Fix ACK handling in DCTCP congestion control, from Yuchung Cheng. 18) Use after free in tun XDP_TX, from Toshiaki Makita. 19) Stale ipv6 header pointer in ipv6 gre code, from Prashant Bhole. 20) Don't reuse remainder of RX page when XDP is set in mlx4, from Saeed Mahameed. 21) Fix window probe handling of TCP rapair sockets, from Stefan Baranoff. 22) Missing socket locking in smc_ioctl(), from Ursula Braun. 23) IPV6_ILA needs DST_CACHE, from Arnd Bergmann. 24) Spectre v1 fix in cxgb3, from Gustavo A. R. Silva. 25) Two spots in ipv6 do a rol32() on a hash value but ignore the result. Fixes from Colin Ian King" * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (176 commits) tcp: identify cryptic messages as TCP seq # bugs ptp: fix missing break in switch hv_netvsc: Fix napi reschedule while receive completion is busy MAINTAINERS: Drop inactive Vitaly Bordug's email net: cavium: Add fine-granular dependencies on PCI net: qca_spi: Fix log level if probe fails net: qca_spi: Make sure the QCA7000 reset is triggered net: qca_spi: Avoid packet drop during initial sync ipv6: fix useless rol32 call on hash ipv6: sr: fix useless rol32 call on hash net: sched: Using NULL instead of plain integer net: usb: asix: replace mii_nway_restart in resume path net: cxgb3_main: fix potential Spectre v1 lib/rhashtable: consider param->min_size when setting initial table size net/smc: reset recv timeout after clc handshake net/smc: add error handling for get_user() net/smc: optimize consumer cursor updates net/nfc: Avoid stalls when nfc_alloc_send_skb() returned NULL. ipv6: ila: select CONFIG_DST_CACHE net: usb: rtl8150: demote allmulti message to dev_dbg() ...
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- 18 Jul, 2018 6 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/robh/linuxLinus Torvalds authored
Pull DeviceTree fixes from Rob Herring: - Fix phandle cache to work with overlays - Correct the default clock-frequency for QCom geni-i2c - Binding doc quote and spelling fixes * tag 'devicetree-fixes-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: of: overlay: update phandle cache on overlay apply and remove dt-bindings: Fix unbalanced quotation marks dt-bindings: soc: qcom: Fix default clock-freq for qcom,geni-i2c dt-bindings: w1-gpio: Remove unneeded unit address Documentation: devicetree: tilcdc: fix spelling mistake "suppors" -> "supports"
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Randy Dunlap authored
Attempt to make cryptic TCP seq number error messages clearer by (1) identifying the source of the message as "TCP", (2) identifying the errors as "seq # bug", and (3) grouping the field identifiers and values by separating them with commas. E.g., the following message is changed from: recvmsg bug 2: copied 73BCB6CD seq 70F17CBE rcvnxt 73BCB9AA fl 0 WARNING: CPU: 2 PID: 1501 at /linux/net/ipv4/tcp.c:1881 tcp_recvmsg+0x649/0xb90 to: TCP recvmsg seq # bug 2: copied 73BCB6CD, seq 70F17CBE, rcvnxt 73BCB9AA, fl 0 WARNING: CPU: 2 PID: 1501 at /linux/net/ipv4/tcp.c:2011 tcp_recvmsg+0x694/0xba0 Suggested-by:
積丹尼 Dan Jacobson <jidanni@jidanni.org> Signed-off-by:
Randy Dunlap <rdunlap@infradead.org> Signed-off-by:
Eric Dumazet <edumazet@google.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Gustavo A. R. Silva authored
It seems that a *break* is missing in order to avoid falling through to the default case. Otherwise, checking *chan* makes no sense. Fixes: 72df7a72 ("ptp: Allow reassigning calibration pin function") Signed-off-by:
Gustavo A. R. Silva <gustavo@embeddedor.com> Acked-by:
Richard Cochran <richardcochran@gmail.com> Signed-off-by:
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Haiyang Zhang authored
If out ring is full temporarily and receive completion cannot go out, we may still need to reschedule napi if certain conditions are met. Otherwise the napi poll might be stopped forever, and cause network disconnect. Fixes: 7426b1a5 ("netvsc: optimize receive completions") Signed-off-by:
Stephen Hemminger <stephen@networkplumber.org> Signed-off-by:
Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by:
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Krzysztof Kozlowski authored
The Vitaly Bordug's email bounces ("ru.mvista.com: Name or service not known") and there was no activity (ack, review, sign) since 2009. Cc: Vitaly Bordug <vitb@kernel.crashing.org> Cc: Pantelis Antoniou <pantelis.antoniou@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by:Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by:
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Alexander Sverdlin authored
Add dependencies on PCI where necessary. Fixes: 7e2bc7fb ("net: cavium: Drop dependency of NET_VENDOR_CAVIUM on PCI") Signed-off-by:
Alexander Sverdlin <alexander.sverdlin@nokia.com> Signed-off-by:
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