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, 417 deletions

diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
deleted file mode 100644
index 04a7cba58eff..000000000000
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ /dev/null
@@ -1,417 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * PPC64 code to handle Linux booting another kernel.
- *
- * Copyright (C) 2004-2005, IBM Corp.
- *
- * Created by: Milton D Miller II
- */
-
-
-#include <linux/kexec.h>
-#include <linux/smp.h>
-#include <linux/thread_info.h>
-#include <linux/init_task.h>
-#include <linux/errno.h>
-#include <linux/kernel.h>
-#include <linux/cpu.h>
-#include <linux/hardirq.h>
-
-#include <asm/page.h>
-#include <asm/current.h>
-#include <asm/machdep.h>
-#include <asm/cacheflush.h>
-#include <asm/firmware.h>
-#include <asm/paca.h>
-#include <asm/mmu.h>
-#include <asm/sections.h>	/* _end */
-#include <asm/prom.h>
-#include <asm/smp.h>
-#include <asm/hw_breakpoint.h>
-#include <asm/asm-prototypes.h>
-#include <asm/svm.h>
-#include <asm/ultravisor.h>
-
-int default_machine_kexec_prepare(struct kimage *image)
-{
-	int i;
-	unsigned long begin, end;	/* limits of segment */
-	unsigned long low, high;	/* limits of blocked memory range */
-	struct device_node *node;
-	const unsigned long *basep;
-	const unsigned int *sizep;
-
-	/*
-	 * Since we use the kernel fault handlers and paging code to
-	 * handle the virtual mode, we must make sure no destination
-	 * overlaps kernel static data or bss.
-	 */
-	for (i = 0; i < image->nr_segments; i++)
-		if (image->segment[i].mem < __pa(_end))
-			return -ETXTBSY;
-
-	/* We also should not overwrite the tce tables */
-	for_each_node_by_type(node, "pci") {
-		basep = of_get_property(node, "linux,tce-base", NULL);
-		sizep = of_get_property(node, "linux,tce-size", NULL);
-		if (basep == NULL || sizep == NULL)
-			continue;
-
-		low = *basep;
-		high = low + (*sizep);
-
-		for (i = 0; i < image->nr_segments; i++) {
-			begin = image->segment[i].mem;
-			end = begin + image->segment[i].memsz;
-
-			if ((begin < high) && (end > low))
-				return -ETXTBSY;
-		}
-	}
-
-	return 0;
-}
-
-static void copy_segments(unsigned long ind)
-{
-	unsigned long entry;
-	unsigned long *ptr;
-	void *dest;
-	void *addr;
-
-	/*
-	 * We rely on kexec_load to create a lists that properly
-	 * initializes these pointers before they are used.
-	 * We will still crash if the list is wrong, but at least
-	 * the compiler will be quiet.
-	 */
-	ptr = NULL;
-	dest = NULL;
-
-	for (entry = ind; !(entry & IND_DONE); entry = *ptr++) {
-		addr = __va(entry & PAGE_MASK);
-
-		switch (entry & IND_FLAGS) {
-		case IND_DESTINATION:
-			dest = addr;
-			break;
-		case IND_INDIRECTION:
-			ptr = addr;
-			break;
-		case IND_SOURCE:
-			copy_page(dest, addr);
-			dest += PAGE_SIZE;
-		}
-	}
-}
-
-void kexec_copy_flush(struct kimage *image)
-{
-	long i, nr_segments = image->nr_segments;
-	struct  kexec_segment ranges[KEXEC_SEGMENT_MAX];
-
-	/* save the ranges on the stack to efficiently flush the icache */
-	memcpy(ranges, image->segment, sizeof(ranges));
-
-	/*
-	 * After this call we may not use anything allocated in dynamic
-	 * memory, including *image.
-	 *
-	 * Only globals and the stack are allowed.
-	 */
-	copy_segments(image->head);
-
-	/*
-	 * we need to clear the icache for all dest pages sometime,
-	 * including ones that were in place on the original copy
-	 */
-	for (i = 0; i < nr_segments; i++)
-		flush_icache_range((unsigned long)__va(ranges[i].mem),
-			(unsigned long)__va(ranges[i].mem + ranges[i].memsz));
-}
-
-#ifdef CONFIG_SMP
-
-static int kexec_all_irq_disabled = 0;
-
-static void kexec_smp_down(void *arg)
-{
-	local_irq_disable();
-	hard_irq_disable();
-
-	mb(); /* make sure our irqs are disabled before we say they are */
-	get_paca()->kexec_state = KEXEC_STATE_IRQS_OFF;
-	while(kexec_all_irq_disabled == 0)
-		cpu_relax();
-	mb(); /* make sure all irqs are disabled before this */
-	hw_breakpoint_disable();
-	/*
-	 * Now every CPU has IRQs off, we can clear out any pending
-	 * IPIs and be sure that no more will come in after this.
-	 */
-	if (ppc_md.kexec_cpu_down)
-		ppc_md.kexec_cpu_down(0, 1);
-
-	kexec_smp_wait();
-	/* NOTREACHED */
-}
-
-static void kexec_prepare_cpus_wait(int wait_state)
-{
-	int my_cpu, i, notified=-1;
-
-	hw_breakpoint_disable();
-	my_cpu = get_cpu();
-	/* Make sure each CPU has at least made it to the state we need.
-	 *
-	 * FIXME: There is a (slim) chance of a problem if not all of the CPUs
-	 * are correctly onlined.  If somehow we start a CPU on boot with RTAS
-	 * start-cpu, but somehow that CPU doesn't write callin_cpu_map[] in
-	 * time, the boot CPU will timeout.  If it does eventually execute
-	 * stuff, the secondary will start up (paca_ptrs[]->cpu_start was
-	 * written) and get into a peculiar state.
-	 * If the platform supports smp_ops->take_timebase(), the secondary CPU
-	 * will probably be spinning in there.  If not (i.e. pseries), the
-	 * secondary will continue on and try to online itself/idle/etc. If it
-	 * survives that, we need to find these
-	 * possible-but-not-online-but-should-be CPUs and chaperone them into
-	 * kexec_smp_wait().
-	 */
-	for_each_online_cpu(i) {
-		if (i == my_cpu)
-			continue;
-
-		while (paca_ptrs[i]->kexec_state < wait_state) {
-			barrier();
-			if (i != notified) {
-				printk(KERN_INFO "kexec: waiting for cpu %d "
-				       "(physical %d) to enter %i state\n",
-				       i, paca_ptrs[i]->hw_cpu_id, wait_state);
-				notified = i;
-			}
-		}
-	}
-	mb();
-}
-
-/*
- * We need to make sure each present CPU is online.  The next kernel will scan
- * the device tree and assume primary threads are online and query secondary
- * threads via RTAS to online them if required.  If we don't online primary
- * threads, they will be stuck.  However, we also online secondary threads as we
- * may be using 'cede offline'.  In this case RTAS doesn't see the secondary
- * threads as offline -- and again, these CPUs will be stuck.
- *
- * So, we online all CPUs that should be running, including secondary threads.
- */
-static void wake_offline_cpus(void)
-{
-	int cpu = 0;
-
-	for_each_present_cpu(cpu) {
-		if (!cpu_online(cpu)) {
-			printk(KERN_INFO "kexec: Waking offline cpu %d.\n",
-			       cpu);
-			WARN_ON(cpu_up(cpu));
-		}
-	}
-}
-
-static void kexec_prepare_cpus(void)
-{
-	wake_offline_cpus();
-	smp_call_function(kexec_smp_down, NULL, /* wait */0);
-	local_irq_disable();
-	hard_irq_disable();
-
-	mb(); /* make sure IRQs are disabled before we say they are */
-	get_paca()->kexec_state = KEXEC_STATE_IRQS_OFF;
-
-	kexec_prepare_cpus_wait(KEXEC_STATE_IRQS_OFF);
-	/* we are sure every CPU has IRQs off at this point */
-	kexec_all_irq_disabled = 1;
-
-	/*
-	 * Before removing MMU mappings make sure all CPUs have entered real
-	 * mode:
-	 */
-	kexec_prepare_cpus_wait(KEXEC_STATE_REAL_MODE);
-
-	/* after we tell the others to go down */
-	if (ppc_md.kexec_cpu_down)
-		ppc_md.kexec_cpu_down(0, 0);
-
-	put_cpu();
-}
-
-#else /* ! SMP */
-
-static void kexec_prepare_cpus(void)
-{
-	/*
-	 * move the secondarys to us so that we can copy
-	 * the new kernel 0-0x100 safely
-	 *
-	 * do this if kexec in setup.c ?
-	 *
-	 * We need to release the cpus if we are ever going from an
-	 * UP to an SMP kernel.
-	 */
-	smp_release_cpus();
-	if (ppc_md.kexec_cpu_down)
-		ppc_md.kexec_cpu_down(0, 0);
-	local_irq_disable();
-	hard_irq_disable();
-}
-
-#endif /* SMP */
-
-/*
- * kexec thread structure and stack.
- *
- * We need to make sure that this is 16384-byte aligned due to the
- * way process stacks are handled.  It also must be statically allocated
- * or allocated as part of the kimage, because everything else may be
- * overwritten when we copy the kexec image.  We piggyback on the
- * "init_task" linker section here to statically allocate a stack.
- *
- * We could use a smaller stack if we don't care about anything using
- * current, but that audit has not been performed.
- */
-static union thread_union kexec_stack __init_task_data =
-	{ };
-
-/*
- * For similar reasons to the stack above, the kexecing CPU needs to be on a
- * static PACA; we switch to kexec_paca.
- */
-struct paca_struct kexec_paca;
-
-/* Our assembly helper, in misc_64.S */
-extern void kexec_sequence(void *newstack, unsigned long start,
-			   void *image, void *control,
-			   void (*clear_all)(void),
-			   bool copy_with_mmu_off) __noreturn;
-
-/* too late to fail here */
-void default_machine_kexec(struct kimage *image)
-{
-	bool copy_with_mmu_off;
-
-	/* prepare control code if any */
-
-	/*
-        * If the kexec boot is the normal one, need to shutdown other cpus
-        * into our wait loop and quiesce interrupts.
-        * Otherwise, in the case of crashed mode (crashing_cpu >= 0),
-        * stopping other CPUs and collecting their pt_regs is done before
-        * using debugger IPI.
-        */
-
-	if (!kdump_in_progress())
-		kexec_prepare_cpus();
-
-	printk("kexec: Starting switchover sequence.\n");
-
-	/* switch to a staticly allocated stack.  Based on irq stack code.
-	 * We setup preempt_count to avoid using VMX in memcpy.
-	 * XXX: the task struct will likely be invalid once we do the copy!
-	 */
-	current_thread_info()->flags = 0;
-	current_thread_info()->preempt_count = HARDIRQ_OFFSET;
-
-	/* We need a static PACA, too; copy this CPU's PACA over and switch to
-	 * it. Also poison per_cpu_offset and NULL lppaca to catch anyone using
-	 * non-static data.
-	 */
-	memcpy(&kexec_paca, get_paca(), sizeof(struct paca_struct));
-	kexec_paca.data_offset = 0xedeaddeadeeeeeeeUL;
-#ifdef CONFIG_PPC_PSERIES
-	kexec_paca.lppaca_ptr = NULL;
-#endif
-
-	if (is_secure_guest() && !(image->preserve_context ||
-				   image->type == KEXEC_TYPE_CRASH)) {
-		uv_unshare_all_pages();
-		printk("kexec: Unshared all shared pages.\n");
-	}
-
-	paca_ptrs[kexec_paca.paca_index] = &kexec_paca;
-
-	setup_paca(&kexec_paca);
-
-	/*
-	 * The lppaca should be unregistered at this point so the HV won't
-	 * touch it. In the case of a crash, none of the lppacas are
-	 * unregistered so there is not much we can do about it here.
-	 */
-
-	/*
-	 * On Book3S, the copy must happen with the MMU off if we are either
-	 * using Radix page tables or we are not in an LPAR since we can
-	 * overwrite the page tables while copying.
-	 *
-	 * In an LPAR, we keep the MMU on otherwise we can't access beyond
-	 * the RMA. On BookE there is no real MMU off mode, so we have to
-	 * keep it enabled as well (but then we have bolted TLB entries).
-	 */
-#ifdef CONFIG_PPC_BOOK3E
-	copy_with_mmu_off = false;
-#else
-	copy_with_mmu_off = radix_enabled() ||
-		!(firmware_has_feature(FW_FEATURE_LPAR) ||
-		  firmware_has_feature(FW_FEATURE_PS3_LV1));
-#endif
-
-	/* Some things are best done in assembly.  Finding globals with
-	 * a toc is easier in C, so pass in what we can.
-	 */
-	kexec_sequence(&kexec_stack, image->start, image,
-		       page_address(image->control_code_page),
-		       mmu_cleanup_all, copy_with_mmu_off);
-	/* NOTREACHED */
-}
-
-#ifdef CONFIG_PPC_BOOK3S_64
-/* Values we need to export to the second kernel via the device tree. */
-static unsigned long htab_base;
-static unsigned long htab_size;
-
-static struct property htab_base_prop = {
-	.name = "linux,htab-base",
-	.length = sizeof(unsigned long),
-	.value = &htab_base,
-};
-
-static struct property htab_size_prop = {
-	.name = "linux,htab-size",
-	.length = sizeof(unsigned long),
-	.value = &htab_size,
-};
-
-static int __init export_htab_values(void)
-{
-	struct device_node *node;
-
-	/* On machines with no htab htab_address is NULL */
-	if (!htab_address)
-		return -ENODEV;
-
-	node = of_find_node_by_path("/chosen");
-	if (!node)
-		return -ENODEV;
-
-	/* remove any stale propertys so ours can be found */
-	of_remove_property(node, of_find_property(node, htab_base_prop.name, NULL));
-	of_remove_property(node, of_find_property(node, htab_size_prop.name, NULL));
-
-	htab_base = cpu_to_be64(__pa(htab_address));
-	of_add_property(node, &htab_base_prop);
-	htab_size = cpu_to_be64(htab_size_bytes);
-	of_add_property(node, &htab_size_prop);
-
-	of_node_put(node);
-	return 0;
-}
-late_initcall(export_htab_values);
-#endif /* CONFIG_PPC_BOOK3S_64 */