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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /arch/parisc/kernel/smp.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'arch/parisc/kernel/smp.c')
-rw-r--r-- | arch/parisc/kernel/smp.c | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c new file mode 100644 index 000000000..7dbd92caf --- /dev/null +++ b/arch/parisc/kernel/smp.c @@ -0,0 +1,515 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* +** SMP Support +** +** Copyright (C) 1999 Walt Drummond <drummond@valinux.com> +** Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> +** Copyright (C) 2001,2004 Grant Grundler <grundler@parisc-linux.org> +** +** Lots of stuff stolen from arch/alpha/kernel/smp.c +** ...and then parisc stole from arch/ia64/kernel/smp.c. Thanks David! :^) +** +** Thanks to John Curry and Ullas Ponnadi. I learned a lot from their work. +** -grant (1/12/2001) +** +*/ +#include <linux/types.h> +#include <linux/spinlock.h> + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/sched/mm.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/smp.h> +#include <linux/kernel_stat.h> +#include <linux/mm.h> +#include <linux/err.h> +#include <linux/delay.h> +#include <linux/bitops.h> +#include <linux/ftrace.h> +#include <linux/cpu.h> +#include <linux/kgdb.h> +#include <linux/sched/hotplug.h> + +#include <linux/atomic.h> +#include <asm/current.h> +#include <asm/delay.h> +#include <asm/tlbflush.h> + +#include <asm/io.h> +#include <asm/irq.h> /* for CPU_IRQ_REGION and friends */ +#include <asm/mmu_context.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <asm/ptrace.h> +#include <asm/unistd.h> +#include <asm/cacheflush.h> + +#undef DEBUG_SMP +#ifdef DEBUG_SMP +static int smp_debug_lvl = 0; +#define smp_debug(lvl, printargs...) \ + if (lvl >= smp_debug_lvl) \ + printk(printargs); +#else +#define smp_debug(lvl, ...) do { } while(0) +#endif /* DEBUG_SMP */ + +volatile struct task_struct *smp_init_current_idle_task; + +/* track which CPU is booting */ +static volatile int cpu_now_booting; + +static DEFINE_PER_CPU(spinlock_t, ipi_lock); + +enum ipi_message_type { + IPI_NOP=0, + IPI_RESCHEDULE=1, + IPI_CALL_FUNC, + IPI_CPU_START, + IPI_CPU_STOP, + IPI_CPU_TEST, +#ifdef CONFIG_KGDB + IPI_ENTER_KGDB, +#endif +}; + + +/********** SMP inter processor interrupt and communication routines */ + +#undef PER_CPU_IRQ_REGION +#ifdef PER_CPU_IRQ_REGION +/* XXX REVISIT Ignore for now. +** *May* need this "hook" to register IPI handler +** once we have perCPU ExtIntr switch tables. +*/ +static void +ipi_init(int cpuid) +{ +#error verify IRQ_OFFSET(IPI_IRQ) is ipi_interrupt() in new IRQ region + + if(cpu_online(cpuid) ) + { + switch_to_idle_task(current); + } + + return; +} +#endif + + +/* +** Yoink this CPU from the runnable list... +** +*/ +static void +halt_processor(void) +{ + /* REVISIT : redirect I/O Interrupts to another CPU? */ + /* REVISIT : does PM *know* this CPU isn't available? */ + set_cpu_online(smp_processor_id(), false); + local_irq_disable(); + __pdc_cpu_rendezvous(); + for (;;) + ; +} + + +irqreturn_t __irq_entry +ipi_interrupt(int irq, void *dev_id) +{ + int this_cpu = smp_processor_id(); + struct cpuinfo_parisc *p = &per_cpu(cpu_data, this_cpu); + unsigned long ops; + unsigned long flags; + + for (;;) { + spinlock_t *lock = &per_cpu(ipi_lock, this_cpu); + spin_lock_irqsave(lock, flags); + ops = p->pending_ipi; + p->pending_ipi = 0; + spin_unlock_irqrestore(lock, flags); + + mb(); /* Order bit clearing and data access. */ + + if (!ops) + break; + + while (ops) { + unsigned long which = ffz(~ops); + + ops &= ~(1 << which); + + switch (which) { + case IPI_NOP: + smp_debug(100, KERN_DEBUG "CPU%d IPI_NOP\n", this_cpu); + break; + + case IPI_RESCHEDULE: + smp_debug(100, KERN_DEBUG "CPU%d IPI_RESCHEDULE\n", this_cpu); + inc_irq_stat(irq_resched_count); + scheduler_ipi(); + break; + + case IPI_CALL_FUNC: + smp_debug(100, KERN_DEBUG "CPU%d IPI_CALL_FUNC\n", this_cpu); + inc_irq_stat(irq_call_count); + generic_smp_call_function_interrupt(); + break; + + case IPI_CPU_START: + smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_START\n", this_cpu); + break; + + case IPI_CPU_STOP: + smp_debug(100, KERN_DEBUG "CPU%d IPI_CPU_STOP\n", this_cpu); + halt_processor(); + break; + + case IPI_CPU_TEST: + smp_debug(100, KERN_DEBUG "CPU%d is alive!\n", this_cpu); + break; +#ifdef CONFIG_KGDB + case IPI_ENTER_KGDB: + smp_debug(100, KERN_DEBUG "CPU%d ENTER_KGDB\n", this_cpu); + kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs()); + break; +#endif + default: + printk(KERN_CRIT "Unknown IPI num on CPU%d: %lu\n", + this_cpu, which); + return IRQ_NONE; + } /* Switch */ + + /* before doing more, let in any pending interrupts */ + if (ops) { + local_irq_enable(); + local_irq_disable(); + } + } /* while (ops) */ + } + return IRQ_HANDLED; +} + + +static inline void +ipi_send(int cpu, enum ipi_message_type op) +{ + struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpu); + spinlock_t *lock = &per_cpu(ipi_lock, cpu); + unsigned long flags; + + spin_lock_irqsave(lock, flags); + p->pending_ipi |= 1 << op; + gsc_writel(IPI_IRQ - CPU_IRQ_BASE, p->hpa); + spin_unlock_irqrestore(lock, flags); +} + +static void +send_IPI_mask(const struct cpumask *mask, enum ipi_message_type op) +{ + int cpu; + + for_each_cpu(cpu, mask) + ipi_send(cpu, op); +} + +static inline void +send_IPI_single(int dest_cpu, enum ipi_message_type op) +{ + BUG_ON(dest_cpu == NO_PROC_ID); + + ipi_send(dest_cpu, op); +} + +static inline void +send_IPI_allbutself(enum ipi_message_type op) +{ + int i; + + preempt_disable(); + for_each_online_cpu(i) { + if (i != smp_processor_id()) + send_IPI_single(i, op); + } + preempt_enable(); +} + +#ifdef CONFIG_KGDB +void kgdb_roundup_cpus(void) +{ + send_IPI_allbutself(IPI_ENTER_KGDB); +} +#endif + +inline void +smp_send_stop(void) { send_IPI_allbutself(IPI_CPU_STOP); } + +void +smp_send_reschedule(int cpu) { send_IPI_single(cpu, IPI_RESCHEDULE); } + +void +smp_send_all_nop(void) +{ + send_IPI_allbutself(IPI_NOP); +} + +void arch_send_call_function_ipi_mask(const struct cpumask *mask) +{ + send_IPI_mask(mask, IPI_CALL_FUNC); +} + +void arch_send_call_function_single_ipi(int cpu) +{ + send_IPI_single(cpu, IPI_CALL_FUNC); +} + +/* + * Called by secondaries to update state and initialize CPU registers. + */ +static void +smp_cpu_init(int cpunum) +{ + extern void init_IRQ(void); /* arch/parisc/kernel/irq.c */ + extern void start_cpu_itimer(void); /* arch/parisc/kernel/time.c */ + + /* Set modes and Enable floating point coprocessor */ + init_per_cpu(cpunum); + + disable_sr_hashing(); + + mb(); + + /* Well, support 2.4 linux scheme as well. */ + if (cpu_online(cpunum)) { + extern void machine_halt(void); /* arch/parisc.../process.c */ + + printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum); + machine_halt(); + } + + notify_cpu_starting(cpunum); + + set_cpu_online(cpunum, true); + + /* Initialise the idle task for this CPU */ + mmgrab(&init_mm); + current->active_mm = &init_mm; + BUG_ON(current->mm); + enter_lazy_tlb(&init_mm, current); + + init_IRQ(); /* make sure no IRQs are enabled or pending */ + start_cpu_itimer(); +} + + +/* + * Slaves start using C here. Indirectly called from smp_slave_stext. + * Do what start_kernel() and main() do for boot strap processor (aka monarch) + */ +void smp_callin(unsigned long pdce_proc) +{ + int slave_id = cpu_now_booting; + +#ifdef CONFIG_64BIT + WARN_ON(((unsigned long)(PAGE0->mem_pdc_hi) << 32 + | PAGE0->mem_pdc) != pdce_proc); +#endif + + smp_cpu_init(slave_id); + + flush_cache_all_local(); /* start with known state */ + flush_tlb_all_local(NULL); + + local_irq_enable(); /* Interrupts have been off until now */ + + cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); + + /* NOTREACHED */ + panic("smp_callin() AAAAaaaaahhhh....\n"); +} + +/* + * Bring one cpu online. + */ +static int smp_boot_one_cpu(int cpuid, struct task_struct *idle) +{ + const struct cpuinfo_parisc *p = &per_cpu(cpu_data, cpuid); + long timeout; + +#ifdef CONFIG_HOTPLUG_CPU + int i; + + /* reset irq statistics for this CPU */ + memset(&per_cpu(irq_stat, cpuid), 0, sizeof(irq_cpustat_t)); + for (i = 0; i < NR_IRQS; i++) { + struct irq_desc *desc = irq_to_desc(i); + + if (desc && desc->kstat_irqs) + *per_cpu_ptr(desc->kstat_irqs, cpuid) = 0; + } +#endif + + /* wait until last booting CPU has started. */ + while (cpu_now_booting) + ; + + /* Let _start know what logical CPU we're booting + ** (offset into init_tasks[],cpu_data[]) + */ + cpu_now_booting = cpuid; + + /* + ** boot strap code needs to know the task address since + ** it also contains the process stack. + */ + smp_init_current_idle_task = idle ; + mb(); + + printk(KERN_INFO "Releasing cpu %d now, hpa=%lx\n", cpuid, p->hpa); + + /* + ** This gets PDC to release the CPU from a very tight loop. + ** + ** From the PA-RISC 2.0 Firmware Architecture Reference Specification: + ** "The MEM_RENDEZ vector specifies the location of OS_RENDEZ which + ** is executed after receiving the rendezvous signal (an interrupt to + ** EIR{0}). MEM_RENDEZ is valid only when it is nonzero and the + ** contents of memory are valid." + */ + gsc_writel(TIMER_IRQ - CPU_IRQ_BASE, p->hpa); + mb(); + + /* + * OK, wait a bit for that CPU to finish staggering about. + * Slave will set a bit when it reaches smp_cpu_init(). + * Once the "monarch CPU" sees the bit change, it can move on. + */ + for (timeout = 0; timeout < 10000; timeout++) { + if(cpu_online(cpuid)) { + /* Which implies Slave has started up */ + cpu_now_booting = 0; + goto alive ; + } + udelay(100); + barrier(); + } + printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid); + return -1; + +alive: + /* Remember the Slave data */ + smp_debug(100, KERN_DEBUG "SMP: CPU:%d came alive after %ld _us\n", + cpuid, timeout * 100); + return 0; +} + +void __init smp_prepare_boot_cpu(void) +{ + int bootstrap_processor = per_cpu(cpu_data, 0).cpuid; + + /* Setup BSP mappings */ + printk(KERN_INFO "SMP: bootstrap CPU ID is %d\n", bootstrap_processor); + + set_cpu_online(bootstrap_processor, true); + set_cpu_present(bootstrap_processor, true); +} + + + +/* +** inventory.c:do_inventory() hasn't yet been run and thus we +** don't 'discover' the additional CPUs until later. +*/ +void __init smp_prepare_cpus(unsigned int max_cpus) +{ + int cpu; + + for_each_possible_cpu(cpu) + spin_lock_init(&per_cpu(ipi_lock, cpu)); + + init_cpu_present(cpumask_of(0)); +} + + +void __init smp_cpus_done(unsigned int cpu_max) +{ +} + + +int __cpu_up(unsigned int cpu, struct task_struct *tidle) +{ + if (cpu_online(cpu)) + return 0; + + if (num_online_cpus() < setup_max_cpus && smp_boot_one_cpu(cpu, tidle)) + return -EIO; + + return cpu_online(cpu) ? 0 : -EIO; +} + +/* + * __cpu_disable runs on the processor to be shutdown. + */ +int __cpu_disable(void) +{ +#ifdef CONFIG_HOTPLUG_CPU + unsigned int cpu = smp_processor_id(); + + remove_cpu_topology(cpu); + + /* + * Take this CPU offline. Once we clear this, we can't return, + * and we must not schedule until we're ready to give up the cpu. + */ + set_cpu_online(cpu, false); + + /* Find a new timesync master */ + if (cpu == time_keeper_id) { + time_keeper_id = cpumask_first(cpu_online_mask); + pr_info("CPU %d is now promoted to time-keeper master\n", time_keeper_id); + } + + disable_percpu_irq(IPI_IRQ); + + irq_migrate_all_off_this_cpu(); + + flush_cache_all_local(); + flush_tlb_all_local(NULL); + + /* disable all irqs, including timer irq */ + local_irq_disable(); + + /* wait for next timer irq ... */ + mdelay(1000/HZ+100); + + /* ... and then clear all pending external irqs */ + set_eiem(0); + mtctl(~0UL, CR_EIRR); + mfctl(CR_EIRR); + mtctl(0, CR_EIRR); +#endif + return 0; +} + +/* + * called on the thread which is asking for a CPU to be shutdown - + * waits until shutdown has completed, or it is timed out. + */ +void __cpu_die(unsigned int cpu) +{ + pdc_cpu_rendezvous_lock(); + + if (!cpu_wait_death(cpu, 5)) { + pr_crit("CPU%u: cpu didn't die\n", cpu); + return; + } + pr_info("CPU%u: is shutting down\n", cpu); + + /* set task's state to interruptible sleep */ + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout((IS_ENABLED(CONFIG_64BIT) ? 8:2) * HZ); + + pdc_cpu_rendezvous_unlock(); +} |