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-rw-r--r--arch/powerpc/kexec/core.c280
1 files changed, 280 insertions, 0 deletions
diff --git a/arch/powerpc/kexec/core.c b/arch/powerpc/kexec/core.c
new file mode 100644
index 000000000000..078fe3d76feb
--- /dev/null
+++ b/arch/powerpc/kexec/core.c
@@ -0,0 +1,280 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Code to handle transition of Linux booting another kernel.
+ *
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
+ * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz
+ * Copyright (C) 2005 IBM Corporation.
+ */
+
+#include <linux/kexec.h>
+#include <linux/reboot.h>
+#include <linux/threads.h>
+#include <linux/memblock.h>
+#include <linux/of.h>
+#include <linux/irq.h>
+#include <linux/ftrace.h>
+
+#include <asm/kdump.h>
+#include <asm/machdep.h>
+#include <asm/pgalloc.h>
+#include <asm/prom.h>
+#include <asm/sections.h>
+
+void machine_kexec_mask_interrupts(void) {
+ unsigned int i;
+ struct irq_desc *desc;
+
+ for_each_irq_desc(i, desc) {
+ struct irq_chip *chip;
+
+ chip = irq_desc_get_chip(desc);
+ if (!chip)
+ continue;
+
+ if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data))
+ chip->irq_eoi(&desc->irq_data);
+
+ if (chip->irq_mask)
+ chip->irq_mask(&desc->irq_data);
+
+ if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data))
+ chip->irq_disable(&desc->irq_data);
+ }
+}
+
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+ default_machine_crash_shutdown(regs);
+}
+
+/*
+ * Do what every setup is needed on image and the
+ * reboot code buffer to allow us to avoid allocations
+ * later.
+ */
+int machine_kexec_prepare(struct kimage *image)
+{
+ if (ppc_md.machine_kexec_prepare)
+ return ppc_md.machine_kexec_prepare(image);
+ else
+ return default_machine_kexec_prepare(image);
+}
+
+void machine_kexec_cleanup(struct kimage *image)
+{
+}
+
+void arch_crash_save_vmcoreinfo(void)
+{
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+ VMCOREINFO_SYMBOL(node_data);
+ VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
+#endif
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+ VMCOREINFO_SYMBOL(contig_page_data);
+#endif
+#if defined(CONFIG_PPC64) && defined(CONFIG_SPARSEMEM_VMEMMAP)
+ VMCOREINFO_SYMBOL(vmemmap_list);
+ VMCOREINFO_SYMBOL(mmu_vmemmap_psize);
+ VMCOREINFO_SYMBOL(mmu_psize_defs);
+ VMCOREINFO_STRUCT_SIZE(vmemmap_backing);
+ VMCOREINFO_OFFSET(vmemmap_backing, list);
+ VMCOREINFO_OFFSET(vmemmap_backing, phys);
+ VMCOREINFO_OFFSET(vmemmap_backing, virt_addr);
+ VMCOREINFO_STRUCT_SIZE(mmu_psize_def);
+ VMCOREINFO_OFFSET(mmu_psize_def, shift);
+#endif
+ vmcoreinfo_append_str("KERNELOFFSET=%lx\n", kaslr_offset());
+}
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+void machine_kexec(struct kimage *image)
+{
+ int save_ftrace_enabled;
+
+ save_ftrace_enabled = __ftrace_enabled_save();
+ this_cpu_disable_ftrace();
+
+ if (ppc_md.machine_kexec)
+ ppc_md.machine_kexec(image);
+ else
+ default_machine_kexec(image);
+
+ this_cpu_enable_ftrace();
+ __ftrace_enabled_restore(save_ftrace_enabled);
+
+ /* Fall back to normal restart if we're still alive. */
+ machine_restart(NULL);
+ for(;;);
+}
+
+void __init reserve_crashkernel(void)
+{
+ unsigned long long crash_size, crash_base;
+ int ret;
+
+ /* use common parsing */
+ ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
+ &crash_size, &crash_base);
+ if (ret == 0 && crash_size > 0) {
+ crashk_res.start = crash_base;
+ crashk_res.end = crash_base + crash_size - 1;
+ }
+
+ if (crashk_res.end == crashk_res.start) {
+ crashk_res.start = crashk_res.end = 0;
+ return;
+ }
+
+ /* We might have got these values via the command line or the
+ * device tree, either way sanitise them now. */
+
+ crash_size = resource_size(&crashk_res);
+
+#ifndef CONFIG_NONSTATIC_KERNEL
+ if (crashk_res.start != KDUMP_KERNELBASE)
+ printk("Crash kernel location must be 0x%x\n",
+ KDUMP_KERNELBASE);
+
+ crashk_res.start = KDUMP_KERNELBASE;
+#else
+ if (!crashk_res.start) {
+#ifdef CONFIG_PPC64
+ /*
+ * On 64bit we split the RMO in half but cap it at half of
+ * a small SLB (128MB) since the crash kernel needs to place
+ * itself and some stacks to be in the first segment.
+ */
+ crashk_res.start = min(0x8000000ULL, (ppc64_rma_size / 2));
+#else
+ crashk_res.start = KDUMP_KERNELBASE;
+#endif
+ }
+
+ crash_base = PAGE_ALIGN(crashk_res.start);
+ if (crash_base != crashk_res.start) {
+ printk("Crash kernel base must be aligned to 0x%lx\n",
+ PAGE_SIZE);
+ crashk_res.start = crash_base;
+ }
+
+#endif
+ crash_size = PAGE_ALIGN(crash_size);
+ crashk_res.end = crashk_res.start + crash_size - 1;
+
+ /* The crash region must not overlap the current kernel */
+ if (overlaps_crashkernel(__pa(_stext), _end - _stext)) {
+ printk(KERN_WARNING
+ "Crash kernel can not overlap current kernel\n");
+ crashk_res.start = crashk_res.end = 0;
+ return;
+ }
+
+ /* Crash kernel trumps memory limit */
+ if (memory_limit && memory_limit <= crashk_res.end) {
+ memory_limit = crashk_res.end + 1;
+ printk("Adjusted memory limit for crashkernel, now 0x%llx\n",
+ memory_limit);
+ }
+
+ printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
+ "for crashkernel (System RAM: %ldMB)\n",
+ (unsigned long)(crash_size >> 20),
+ (unsigned long)(crashk_res.start >> 20),
+ (unsigned long)(memblock_phys_mem_size() >> 20));
+
+ if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
+ memblock_reserve(crashk_res.start, crash_size)) {
+ pr_err("Failed to reserve memory for crashkernel!\n");
+ crashk_res.start = crashk_res.end = 0;
+ return;
+ }
+}
+
+int overlaps_crashkernel(unsigned long start, unsigned long size)
+{
+ return (start + size) > crashk_res.start && start <= crashk_res.end;
+}
+
+/* Values we need to export to the second kernel via the device tree. */
+static phys_addr_t kernel_end;
+static phys_addr_t crashk_base;
+static phys_addr_t crashk_size;
+static unsigned long long mem_limit;
+
+static struct property kernel_end_prop = {
+ .name = "linux,kernel-end",
+ .length = sizeof(phys_addr_t),
+ .value = &kernel_end,
+};
+
+static struct property crashk_base_prop = {
+ .name = "linux,crashkernel-base",
+ .length = sizeof(phys_addr_t),
+ .value = &crashk_base
+};
+
+static struct property crashk_size_prop = {
+ .name = "linux,crashkernel-size",
+ .length = sizeof(phys_addr_t),
+ .value = &crashk_size,
+};
+
+static struct property memory_limit_prop = {
+ .name = "linux,memory-limit",
+ .length = sizeof(unsigned long long),
+ .value = &mem_limit,
+};
+
+#define cpu_to_be_ulong __PASTE(cpu_to_be, BITS_PER_LONG)
+
+static void __init export_crashk_values(struct device_node *node)
+{
+ /* There might be existing crash kernel properties, but we can't
+ * be sure what's in them, so remove them. */
+ of_remove_property(node, of_find_property(node,
+ "linux,crashkernel-base", NULL));
+ of_remove_property(node, of_find_property(node,
+ "linux,crashkernel-size", NULL));
+
+ if (crashk_res.start != 0) {
+ crashk_base = cpu_to_be_ulong(crashk_res.start),
+ of_add_property(node, &crashk_base_prop);
+ crashk_size = cpu_to_be_ulong(resource_size(&crashk_res));
+ of_add_property(node, &crashk_size_prop);
+ }
+
+ /*
+ * memory_limit is required by the kexec-tools to limit the
+ * crash regions to the actual memory used.
+ */
+ mem_limit = cpu_to_be_ulong(memory_limit);
+ of_update_property(node, &memory_limit_prop);
+}
+
+static int __init kexec_setup(void)
+{
+ struct device_node *node;
+
+ node = of_find_node_by_path("/chosen");
+ if (!node)
+ return -ENOENT;
+
+ /* remove any stale properties so ours can be found */
+ of_remove_property(node, of_find_property(node, kernel_end_prop.name, NULL));
+
+ /* information needed by userspace when using default_machine_kexec */
+ kernel_end = cpu_to_be_ulong(__pa(_end));
+ of_add_property(node, &kernel_end_prop);
+
+ export_crashk_values(node);
+
+ of_node_put(node);
+ return 0;
+}
+late_initcall(kexec_setup);