blob: 9e1a25398f98cbe383be9fdaaf6f2194f9fab3fc [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SMP support for PowerNV machines.
*
* Copyright 2011 IBM Corp.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/sched/hotplug.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
#include <asm/irq.h>
#include <asm/smp.h>
#include <asm/paca.h>
#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/firmware.h>
#include <asm/vdso_datapage.h>
#include <asm/cputhreads.h>
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/opal.h>
#include <asm/runlatch.h>
#include <asm/code-patching.h>
#include <asm/dbell.h>
#include <asm/kvm_ppc.h>
#include <asm/ppc-opcode.h>
#include <asm/cpuidle.h>
#include <asm/kexec.h>
#include <asm/reg.h>
#include <asm/powernv.h>
#include "powernv.h"
#ifdef DEBUG
#include <asm/udbg.h>
#define DBG(fmt...) udbg_printf(fmt)
#else
#define DBG(fmt...) do { } while (0)
#endif
static void pnv_smp_setup_cpu(int cpu)
{
/*
* P9 workaround for CI vector load (see traps.c),
* enable the corresponding HMI interrupt
*/
if (pvr_version_is(PVR_POWER9))
mtspr(SPRN_HMEER, mfspr(SPRN_HMEER) | PPC_BIT(17));
if (xive_enabled())
xive_smp_setup_cpu();
else if (cpu != boot_cpuid)
xics_setup_cpu();
}
static int pnv_smp_kick_cpu(int nr)
{
unsigned int pcpu;
unsigned long start_here =
__pa(ppc_function_entry(generic_secondary_smp_init));
long rc;
uint8_t status;
if (nr < 0 || nr >= nr_cpu_ids)
return -EINVAL;
pcpu = get_hard_smp_processor_id(nr);
/*
* If we already started or OPAL is not supported, we just
* kick the CPU via the PACA
*/
if (paca_ptrs[nr]->cpu_start || !firmware_has_feature(FW_FEATURE_OPAL))
goto kick;
/*
* At this point, the CPU can either be spinning on the way in
* from kexec or be inside OPAL waiting to be started for the
* first time. OPAL v3 allows us to query OPAL to know if it
* has the CPUs, so we do that
*/
rc = opal_query_cpu_status(pcpu, &status);
if (rc != OPAL_SUCCESS) {
pr_warn("OPAL Error %ld querying CPU %d state\n", rc, nr);
return -ENODEV;
}
/*
* Already started, just kick it, probably coming from
* kexec and spinning
*/
if (status == OPAL_THREAD_STARTED)
goto kick;
/*
* Available/inactive, let's kick it
*/
if (status == OPAL_THREAD_INACTIVE) {
pr_devel("OPAL: Starting CPU %d (HW 0x%x)...\n", nr, pcpu);
rc = opal_start_cpu(pcpu, start_here);
if (rc != OPAL_SUCCESS) {
pr_warn("OPAL Error %ld starting CPU %d\n", rc, nr);
return -ENODEV;
}
} else {
/*
* An unavailable CPU (or any other unknown status)
* shouldn't be started. It should also
* not be in the possible map but currently it can
* happen
*/
pr_devel("OPAL: CPU %d (HW 0x%x) is unavailable"
" (status %d)...\n", nr, pcpu, status);
return -ENODEV;
}
kick:
return smp_generic_kick_cpu(nr);
}
#ifdef CONFIG_HOTPLUG_CPU
static int pnv_smp_cpu_disable(void)
{
int cpu = smp_processor_id();
/* This is identical to pSeries... might consolidate by
* moving migrate_irqs_away to a ppc_md with default to
* the generic fixup_irqs. --BenH.
*/
set_cpu_online(cpu, false);
vdso_data->processorCount--;
if (cpu == boot_cpuid)
boot_cpuid = cpumask_any(cpu_online_mask);
if (xive_enabled())
xive_smp_disable_cpu();
else
xics_migrate_irqs_away();
cleanup_cpu_mmu_context();
return 0;
}
static void pnv_flush_interrupts(void)
{
if (cpu_has_feature(CPU_FTR_ARCH_300)) {
if (xive_enabled())
xive_flush_interrupt();
else
icp_opal_flush_interrupt();
} else {
icp_native_flush_interrupt();
}
}
static void pnv_cpu_offline_self(void)
{
unsigned long srr1, unexpected_mask, wmask;
unsigned int cpu;
u64 lpcr_val;
/* Standard hot unplug procedure */
idle_task_exit();
cpu = smp_processor_id();
DBG("CPU%d offline\n", cpu);
generic_set_cpu_dead(cpu);
smp_wmb();
wmask = SRR1_WAKEMASK;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
wmask = SRR1_WAKEMASK_P8;
/*
* This turns the irq soft-disabled state we're called with, into a
* hard-disabled state with pending irq_happened interrupts cleared.
*
* PACA_IRQ_DEC - Decrementer should be ignored.
* PACA_IRQ_HMI - Can be ignored, processing is done in real mode.
* PACA_IRQ_DBELL, EE, PMI - Unexpected.
*/
hard_irq_disable();
if (generic_check_cpu_restart(cpu))
goto out;
unexpected_mask = ~(PACA_IRQ_DEC | PACA_IRQ_HMI | PACA_IRQ_HARD_DIS);
if (local_paca->irq_happened & unexpected_mask) {
if (local_paca->irq_happened & PACA_IRQ_EE)
pnv_flush_interrupts();
DBG("CPU%d Unexpected exit while offline irq_happened=%lx!\n",
cpu, local_paca->irq_happened);
}
local_paca->irq_happened = PACA_IRQ_HARD_DIS;
/*
* We don't want to take decrementer interrupts while we are
* offline, so clear LPCR:PECE1. We keep PECE2 (and
* LPCR_PECE_HVEE on P9) enabled so as to let IPIs in.
*
* If the CPU gets woken up by a special wakeup, ensure that
* the SLW engine sets LPCR with decrementer bit cleared, else
* the CPU will come back to the kernel due to a spurious
* wakeup.
*/
lpcr_val = mfspr(SPRN_LPCR) & ~(u64)LPCR_PECE1;
pnv_program_cpu_hotplug_lpcr(cpu, lpcr_val);
while (!generic_check_cpu_restart(cpu)) {
/*
* Clear IPI flag, since we don't handle IPIs while
* offline, except for those when changing micro-threading
* mode, which are handled explicitly below, and those
* for coming online, which are handled via
* generic_check_cpu_restart() calls.
*/
kvmppc_clear_host_ipi(cpu);
srr1 = pnv_cpu_offline(cpu);
WARN_ON_ONCE(!irqs_disabled());
WARN_ON(lazy_irq_pending());
/*
* If the SRR1 value indicates that we woke up due to
* an external interrupt, then clear the interrupt.
* We clear the interrupt before checking for the
* reason, so as to avoid a race where we wake up for
* some other reason, find nothing and clear the interrupt
* just as some other cpu is sending us an interrupt.
* If we returned from power7_nap as a result of
* having finished executing in a KVM guest, then srr1
* contains 0.
*/
if (((srr1 & wmask) == SRR1_WAKEEE) ||
((srr1 & wmask) == SRR1_WAKEHVI)) {
pnv_flush_interrupts();
} else if ((srr1 & wmask) == SRR1_WAKEHDBELL) {
unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
asm volatile(PPC_MSGCLR(%0) : : "r" (msg));
} else if ((srr1 & wmask) == SRR1_WAKERESET) {
irq_set_pending_from_srr1(srr1);
/* Does not return */
}
smp_mb();
/*
* For kdump kernels, we process the ipi and jump to
* crash_ipi_callback
*/
if (kdump_in_progress()) {
/*
* If we got to this point, we've not used
* NMI's, otherwise we would have gone
* via the SRR1_WAKERESET path. We are
* using regular IPI's for waking up offline
* threads.
*/
struct pt_regs regs;
ppc_save_regs(&regs);
crash_ipi_callback(&regs);
/* Does not return */
}
if (cpu_core_split_required())
continue;
if (srr1 && !generic_check_cpu_restart(cpu))
DBG("CPU%d Unexpected exit while offline srr1=%lx!\n",
cpu, srr1);
}
/*
* Re-enable decrementer interrupts in LPCR.
*
* Further, we want stop states to be woken up by decrementer
* for non-hotplug cases. So program the LPCR via stop api as
* well.
*/
lpcr_val = mfspr(SPRN_LPCR) | (u64)LPCR_PECE1;
pnv_program_cpu_hotplug_lpcr(cpu, lpcr_val);
out:
DBG("CPU%d coming online...\n", cpu);
}
#endif /* CONFIG_HOTPLUG_CPU */
static int pnv_cpu_bootable(unsigned int nr)
{
/*
* Starting with POWER8, the subcore logic relies on all threads of a
* core being booted so that they can participate in split mode
* switches. So on those machines we ignore the smt_enabled_at_boot
* setting (smt-enabled on the kernel command line).
*/
if (cpu_has_feature(CPU_FTR_ARCH_207S))
return 1;
return smp_generic_cpu_bootable(nr);
}
static int pnv_smp_prepare_cpu(int cpu)
{
if (xive_enabled())
return xive_smp_prepare_cpu(cpu);
return 0;
}
/* Cause IPI as setup by the interrupt controller (xics or xive) */
static void (*ic_cause_ipi)(int cpu);
static void pnv_cause_ipi(int cpu)
{
if (doorbell_try_core_ipi(cpu))
return;
ic_cause_ipi(cpu);
}
static void __init pnv_smp_probe(void)
{
if (xive_enabled())
xive_smp_probe();
else
xics_smp_probe();
if (cpu_has_feature(CPU_FTR_DBELL)) {
ic_cause_ipi = smp_ops->cause_ipi;
WARN_ON(!ic_cause_ipi);
if (cpu_has_feature(CPU_FTR_ARCH_300))
smp_ops->cause_ipi = doorbell_global_ipi;
else
smp_ops->cause_ipi = pnv_cause_ipi;
}
}
noinstr static int pnv_system_reset_exception(struct pt_regs *regs)
{
if (smp_handle_nmi_ipi(regs))
return 1;
return 0;
}
static int pnv_cause_nmi_ipi(int cpu)
{
int64_t rc;
if (cpu >= 0) {
int h = get_hard_smp_processor_id(cpu);
if (opal_check_token(OPAL_QUIESCE))
opal_quiesce(QUIESCE_HOLD, h);
rc = opal_signal_system_reset(h);
if (opal_check_token(OPAL_QUIESCE))
opal_quiesce(QUIESCE_RESUME, h);
if (rc != OPAL_SUCCESS)
return 0;
return 1;
} else if (cpu == NMI_IPI_ALL_OTHERS) {
bool success = true;
int c;
if (opal_check_token(OPAL_QUIESCE))
opal_quiesce(QUIESCE_HOLD, -1);
/*
* We do not use broadcasts (yet), because it's not clear
* exactly what semantics Linux wants or the firmware should
* provide.
*/
for_each_online_cpu(c) {
if (c == smp_processor_id())
continue;
rc = opal_signal_system_reset(
get_hard_smp_processor_id(c));
if (rc != OPAL_SUCCESS)
success = false;
}
if (opal_check_token(OPAL_QUIESCE))
opal_quiesce(QUIESCE_RESUME, -1);
if (success)
return 1;
/*
* Caller will fall back to doorbells, which may pick
* up the remainders.
*/
}
return 0;
}
static struct smp_ops_t pnv_smp_ops = {
.message_pass = NULL, /* Use smp_muxed_ipi_message_pass */
.cause_ipi = NULL, /* Filled at runtime by pnv_smp_probe() */
.cause_nmi_ipi = NULL,
.probe = pnv_smp_probe,
.prepare_cpu = pnv_smp_prepare_cpu,
.kick_cpu = pnv_smp_kick_cpu,
.setup_cpu = pnv_smp_setup_cpu,
.cpu_bootable = pnv_cpu_bootable,
#ifdef CONFIG_HOTPLUG_CPU
.cpu_disable = pnv_smp_cpu_disable,
.cpu_die = generic_cpu_die,
.cpu_offline_self = pnv_cpu_offline_self,
#endif /* CONFIG_HOTPLUG_CPU */
};
/* This is called very early during platform setup_arch */
void __init pnv_smp_init(void)
{
if (opal_check_token(OPAL_SIGNAL_SYSTEM_RESET)) {
ppc_md.system_reset_exception = pnv_system_reset_exception;
pnv_smp_ops.cause_nmi_ipi = pnv_cause_nmi_ipi;
}
smp_ops = &pnv_smp_ops;
#ifdef CONFIG_HOTPLUG_CPU
#ifdef CONFIG_KEXEC_CORE
crash_wake_offline = 1;
#endif
#endif
}