powerpc/kexec: Move kexec files into a dedicated subdir.

arch/powerpc/kernel/ contains 8 files dedicated to kexec.

Move them into a dedicated subdirectory.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Move to a/p/kexec, drop the 'machine' naming and use 'core' instead]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/afbef97ec6a978574a5cf91a4441000e0a9da42a.1572351221.git.christophe.leroy@c-s.fr

1 files changed, 0 insertions, 374 deletions

diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
deleted file mode 100644
index d488311efab1..000000000000
--- a/arch/powerpc/kernel/crash.c
+++ /dev/null
@@ -1,374 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Architecture specific (PPC64) functions for kexec based crash dumps.
- *
- * Copyright (C) 2005, IBM Corp.
- *
- * Created by: Haren Myneni
- */
-
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include <linux/reboot.h>
-#include <linux/kexec.h>
-#include <linux/export.h>
-#include <linux/crash_dump.h>
-#include <linux/delay.h>
-#include <linux/irq.h>
-#include <linux/types.h>
-
-#include <asm/processor.h>
-#include <asm/machdep.h>
-#include <asm/kexec.h>
-#include <asm/prom.h>
-#include <asm/smp.h>
-#include <asm/setjmp.h>
-#include <asm/debug.h>
-
-/*
- * The primary CPU waits a while for all secondary CPUs to enter. This is to
- * avoid sending an IPI if the secondary CPUs are entering
- * crash_kexec_secondary on their own (eg via a system reset).
- *
- * The secondary timeout has to be longer than the primary. Both timeouts are
- * in milliseconds.
- */
-#define PRIMARY_TIMEOUT		500
-#define SECONDARY_TIMEOUT	1000
-
-#define IPI_TIMEOUT		10000
-#define REAL_MODE_TIMEOUT	10000
-
-static int time_to_dump;
-/*
- * crash_wake_offline should be set to 1 by platforms that intend to wake
- * up offline cpus prior to jumping to a kdump kernel. Currently powernv
- * sets it to 1, since we want to avoid things from happening when an
- * offline CPU wakes up due to something like an HMI (malfunction error),
- * which propagates to all threads.
- */
-int crash_wake_offline;
-
-#define CRASH_HANDLER_MAX 3
-/* List of shutdown handles */
-static crash_shutdown_t crash_shutdown_handles[CRASH_HANDLER_MAX];
-static DEFINE_SPINLOCK(crash_handlers_lock);
-
-static unsigned long crash_shutdown_buf[JMP_BUF_LEN];
-static int crash_shutdown_cpu = -1;
-
-static int handle_fault(struct pt_regs *regs)
-{
-	if (crash_shutdown_cpu == smp_processor_id())
-		longjmp(crash_shutdown_buf, 1);
-	return 0;
-}
-
-#ifdef CONFIG_SMP
-
-static atomic_t cpus_in_crash;
-void crash_ipi_callback(struct pt_regs *regs)
-{
-	static cpumask_t cpus_state_saved = CPU_MASK_NONE;
-
-	int cpu = smp_processor_id();
-
-	hard_irq_disable();
-	if (!cpumask_test_cpu(cpu, &cpus_state_saved)) {
-		crash_save_cpu(regs, cpu);
-		cpumask_set_cpu(cpu, &cpus_state_saved);
-	}
-
-	atomic_inc(&cpus_in_crash);
-	smp_mb__after_atomic();
-
-	/*
-	 * Starting the kdump boot.
-	 * This barrier is needed to make sure that all CPUs are stopped.
-	 */
-	while (!time_to_dump)
-		cpu_relax();
-
-	if (ppc_md.kexec_cpu_down)
-		ppc_md.kexec_cpu_down(1, 1);
-
-#ifdef CONFIG_PPC64
-	kexec_smp_wait();
-#else
-	for (;;);	/* FIXME */
-#endif
-
-	/* NOTREACHED */
-}
-
-static void crash_kexec_prepare_cpus(int cpu)
-{
-	unsigned int msecs;
-	unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
-	int tries = 0;
-	int (*old_handler)(struct pt_regs *regs);
-
-	printk(KERN_EMERG "Sending IPI to other CPUs\n");
-
-	if (crash_wake_offline)
-		ncpus = num_present_cpus() - 1;
-
-	crash_send_ipi(crash_ipi_callback);
-	smp_wmb();
-
-again:
-	/*
-	 * FIXME: Until we will have the way to stop other CPUs reliably,
-	 * the crash CPU will send an IPI and wait for other CPUs to
-	 * respond.
-	 */
-	msecs = IPI_TIMEOUT;
-	while ((atomic_read(&cpus_in_crash) < ncpus) && (--msecs > 0))
-		mdelay(1);
-
-	/* Would it be better to replace the trap vector here? */
-
-	if (atomic_read(&cpus_in_crash) >= ncpus) {
-		printk(KERN_EMERG "IPI complete\n");
-		return;
-	}
-
-	printk(KERN_EMERG "ERROR: %d cpu(s) not responding\n",
-		ncpus - atomic_read(&cpus_in_crash));
-
-	/*
-	 * If we have a panic timeout set then we can't wait indefinitely
-	 * for someone to activate system reset. We also give up on the
-	 * second time through if system reset fail to work.
-	 */
-	if ((panic_timeout > 0) || (tries > 0))
-		return;
-
-	/*
-	 * A system reset will cause all CPUs to take an 0x100 exception.
-	 * The primary CPU returns here via setjmp, and the secondary
-	 * CPUs reexecute the crash_kexec_secondary path.
-	 */
-	old_handler = __debugger;
-	__debugger = handle_fault;
-	crash_shutdown_cpu = smp_processor_id();
-
-	if (setjmp(crash_shutdown_buf) == 0) {
-		printk(KERN_EMERG "Activate system reset (dumprestart) "
-				  "to stop other cpu(s)\n");
-
-		/*
-		 * A system reset will force all CPUs to execute the
-		 * crash code again. We need to reset cpus_in_crash so we
-		 * wait for everyone to do this.
-		 */
-		atomic_set(&cpus_in_crash, 0);
-		smp_mb();
-
-		while (atomic_read(&cpus_in_crash) < ncpus)
-			cpu_relax();
-	}
-
-	crash_shutdown_cpu = -1;
-	__debugger = old_handler;
-
-	tries++;
-	goto again;
-}
-
-/*
- * This function will be called by secondary cpus.
- */
-void crash_kexec_secondary(struct pt_regs *regs)
-{
-	unsigned long flags;
-	int msecs = SECONDARY_TIMEOUT;
-
-	local_irq_save(flags);
-
-	/* Wait for the primary crash CPU to signal its progress */
-	while (crashing_cpu < 0) {
-		if (--msecs < 0) {
-			/* No response, kdump image may not have been loaded */
-			local_irq_restore(flags);
-			return;
-		}
-
-		mdelay(1);
-	}
-
-	crash_ipi_callback(regs);
-}
-
-#else	/* ! CONFIG_SMP */
-
-static void crash_kexec_prepare_cpus(int cpu)
-{
-	/*
-	 * move the secondaries to us so that we can copy
-	 * the new kernel 0-0x100 safely
-	 *
-	 * do this if kexec in setup.c ?
-	 */
-#ifdef CONFIG_PPC64
-	smp_release_cpus();
-#else
-	/* FIXME */
-#endif
-}
-
-void crash_kexec_secondary(struct pt_regs *regs)
-{
-}
-#endif	/* CONFIG_SMP */
-
-/* wait for all the CPUs to hit real mode but timeout if they don't come in */
-#if defined(CONFIG_SMP) && defined(CONFIG_PPC64)
-static void __maybe_unused crash_kexec_wait_realmode(int cpu)
-{
-	unsigned int msecs;
-	int i;
-
-	msecs = REAL_MODE_TIMEOUT;
-	for (i=0; i < nr_cpu_ids && msecs > 0; i++) {
-		if (i == cpu)
-			continue;
-
-		while (paca_ptrs[i]->kexec_state < KEXEC_STATE_REAL_MODE) {
-			barrier();
-			if (!cpu_possible(i) || !cpu_online(i) || (msecs <= 0))
-				break;
-			msecs--;
-			mdelay(1);
-		}
-	}
-	mb();
-}
-#else
-static inline void crash_kexec_wait_realmode(int cpu) {}
-#endif	/* CONFIG_SMP && CONFIG_PPC64 */
-
-/*
- * Register a function to be called on shutdown.  Only use this if you
- * can't reset your device in the second kernel.
- */
-int crash_shutdown_register(crash_shutdown_t handler)
-{
-	unsigned int i, rc;
-
-	spin_lock(&crash_handlers_lock);
-	for (i = 0 ; i < CRASH_HANDLER_MAX; i++)
-		if (!crash_shutdown_handles[i]) {
-			/* Insert handle at first empty entry */
-			crash_shutdown_handles[i] = handler;
-			rc = 0;
-			break;
-		}
-
-	if (i == CRASH_HANDLER_MAX) {
-		printk(KERN_ERR "Crash shutdown handles full, "
-		       "not registered.\n");
-		rc = 1;
-	}
-
-	spin_unlock(&crash_handlers_lock);
-	return rc;
-}
-EXPORT_SYMBOL(crash_shutdown_register);
-
-int crash_shutdown_unregister(crash_shutdown_t handler)
-{
-	unsigned int i, rc;
-
-	spin_lock(&crash_handlers_lock);
-	for (i = 0 ; i < CRASH_HANDLER_MAX; i++)
-		if (crash_shutdown_handles[i] == handler)
-			break;
-
-	if (i == CRASH_HANDLER_MAX) {
-		printk(KERN_ERR "Crash shutdown handle not found\n");
-		rc = 1;
-	} else {
-		/* Shift handles down */
-		for (; i < (CRASH_HANDLER_MAX - 1); i++)
-			crash_shutdown_handles[i] =
-				crash_shutdown_handles[i+1];
-		/*
-		 * Reset last entry to NULL now that it has been shifted down,
-		 * this will allow new handles to be added here.
-		 */
-		crash_shutdown_handles[i] = NULL;
-		rc = 0;
-	}
-
-	spin_unlock(&crash_handlers_lock);
-	return rc;
-}
-EXPORT_SYMBOL(crash_shutdown_unregister);
-
-void default_machine_crash_shutdown(struct pt_regs *regs)
-{
-	unsigned int i;
-	int (*old_handler)(struct pt_regs *regs);
-
-	/*
-	 * This function is only called after the system
-	 * has panicked or is otherwise in a critical state.
-	 * The minimum amount of code to allow a kexec'd kernel
-	 * to run successfully needs to happen here.
-	 *
-	 * In practice this means stopping other cpus in
-	 * an SMP system.
-	 * The kernel is broken so disable interrupts.
-	 */
-	hard_irq_disable();
-
-	/*
-	 * Make a note of crashing cpu. Will be used in machine_kexec
-	 * such that another IPI will not be sent.
-	 */
-	crashing_cpu = smp_processor_id();
-
-	/*
-	 * If we came in via system reset, wait a while for the secondary
-	 * CPUs to enter.
-	 */
-	if (TRAP(regs) == 0x100)
-		mdelay(PRIMARY_TIMEOUT);
-
-	crash_kexec_prepare_cpus(crashing_cpu);
-
-	crash_save_cpu(regs, crashing_cpu);
-
-	time_to_dump = 1;
-
-	crash_kexec_wait_realmode(crashing_cpu);
-
-	machine_kexec_mask_interrupts();
-
-	/*
-	 * Call registered shutdown routines safely.  Swap out
-	 * __debugger_fault_handler, and replace on exit.
-	 */
-	old_handler = __debugger_fault_handler;
-	__debugger_fault_handler = handle_fault;
-	crash_shutdown_cpu = smp_processor_id();
-	for (i = 0; i < CRASH_HANDLER_MAX && crash_shutdown_handles[i]; i++) {
-		if (setjmp(crash_shutdown_buf) == 0) {
-			/*
-			 * Insert syncs and delay to ensure
-			 * instructions in the dangerous region don't
-			 * leak away from this protected region.
-			 */
-			asm volatile("sync; isync");
-			/* dangerous region */
-			crash_shutdown_handles[i]();
-			asm volatile("sync; isync");
-		}
-	}
-	crash_shutdown_cpu = -1;
-	__debugger_fault_handler = old_handler;
-
-	if (ppc_md.kexec_cpu_down)
-		ppc_md.kexec_cpu_down(1, 0);
-}