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-rw-r--r--arch/x86/kernel/crash.c366
1 files changed, 366 insertions, 0 deletions
diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
new file mode 100644
index 000000000..54cd959cb
--- /dev/null
+++ b/arch/x86/kernel/crash.c
@@ -0,0 +1,366 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Architecture specific (i386/x86_64) functions for kexec based crash dumps.
+ *
+ * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
+ *
+ * Copyright (C) IBM Corporation, 2004. All rights reserved.
+ * Copyright (C) Red Hat Inc., 2014. All rights reserved.
+ * Authors:
+ * Vivek Goyal <vgoyal@redhat.com>
+ *
+ */
+
+#define pr_fmt(fmt) "kexec: " fmt
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/reboot.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <linux/elf.h>
+#include <linux/elfcore.h>
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/memblock.h>
+
+#include <asm/processor.h>
+#include <asm/hardirq.h>
+#include <asm/nmi.h>
+#include <asm/hw_irq.h>
+#include <asm/apic.h>
+#include <asm/e820/types.h>
+#include <asm/io_apic.h>
+#include <asm/hpet.h>
+#include <linux/kdebug.h>
+#include <asm/cpu.h>
+#include <asm/reboot.h>
+#include <asm/intel_pt.h>
+#include <asm/crash.h>
+#include <asm/cmdline.h>
+
+/* Used while preparing memory map entries for second kernel */
+struct crash_memmap_data {
+ struct boot_params *params;
+ /* Type of memory */
+ unsigned int type;
+};
+
+#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)
+
+static void kdump_nmi_callback(int cpu, struct pt_regs *regs)
+{
+ crash_save_cpu(regs, cpu);
+
+ /*
+ * Disable Intel PT to stop its logging
+ */
+ cpu_emergency_stop_pt();
+
+ disable_local_APIC();
+}
+
+void kdump_nmi_shootdown_cpus(void)
+{
+ nmi_shootdown_cpus(kdump_nmi_callback);
+
+ disable_local_APIC();
+}
+
+/* Override the weak function in kernel/panic.c */
+void crash_smp_send_stop(void)
+{
+ static int cpus_stopped;
+
+ if (cpus_stopped)
+ return;
+
+ if (smp_ops.crash_stop_other_cpus)
+ smp_ops.crash_stop_other_cpus();
+ else
+ smp_send_stop();
+
+ cpus_stopped = 1;
+}
+
+#else
+void crash_smp_send_stop(void)
+{
+ /* There are no cpus to shootdown */
+}
+#endif
+
+void native_machine_crash_shutdown(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 shooting down the other cpus in
+ * an SMP system.
+ */
+ /* The kernel is broken so disable interrupts */
+ local_irq_disable();
+
+ crash_smp_send_stop();
+
+ cpu_emergency_disable_virtualization();
+
+ /*
+ * Disable Intel PT to stop its logging
+ */
+ cpu_emergency_stop_pt();
+
+#ifdef CONFIG_X86_IO_APIC
+ /* Prevent crash_kexec() from deadlocking on ioapic_lock. */
+ ioapic_zap_locks();
+ clear_IO_APIC();
+#endif
+ lapic_shutdown();
+ restore_boot_irq_mode();
+#ifdef CONFIG_HPET_TIMER
+ hpet_disable();
+#endif
+ crash_save_cpu(regs, safe_smp_processor_id());
+}
+
+#ifdef CONFIG_KEXEC_FILE
+
+static int get_nr_ram_ranges_callback(struct resource *res, void *arg)
+{
+ unsigned int *nr_ranges = arg;
+
+ (*nr_ranges)++;
+ return 0;
+}
+
+/* Gather all the required information to prepare elf headers for ram regions */
+static struct crash_mem *fill_up_crash_elf_data(void)
+{
+ unsigned int nr_ranges = 0;
+ struct crash_mem *cmem;
+
+ walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
+ if (!nr_ranges)
+ return NULL;
+
+ /*
+ * Exclusion of crash region and/or crashk_low_res may cause
+ * another range split. So add extra two slots here.
+ */
+ nr_ranges += 2;
+ cmem = vzalloc(struct_size(cmem, ranges, nr_ranges));
+ if (!cmem)
+ return NULL;
+
+ cmem->max_nr_ranges = nr_ranges;
+ cmem->nr_ranges = 0;
+
+ return cmem;
+}
+
+/*
+ * Look for any unwanted ranges between mstart, mend and remove them. This
+ * might lead to split and split ranges are put in cmem->ranges[] array
+ */
+static int elf_header_exclude_ranges(struct crash_mem *cmem)
+{
+ int ret = 0;
+
+ /* Exclude the low 1M because it is always reserved */
+ ret = crash_exclude_mem_range(cmem, 0, (1<<20)-1);
+ if (ret)
+ return ret;
+
+ /* Exclude crashkernel region */
+ ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
+ if (ret)
+ return ret;
+
+ if (crashk_low_res.end)
+ ret = crash_exclude_mem_range(cmem, crashk_low_res.start,
+ crashk_low_res.end);
+
+ return ret;
+}
+
+static int prepare_elf64_ram_headers_callback(struct resource *res, void *arg)
+{
+ struct crash_mem *cmem = arg;
+
+ cmem->ranges[cmem->nr_ranges].start = res->start;
+ cmem->ranges[cmem->nr_ranges].end = res->end;
+ cmem->nr_ranges++;
+
+ return 0;
+}
+
+/* Prepare elf headers. Return addr and size */
+static int prepare_elf_headers(struct kimage *image, void **addr,
+ unsigned long *sz)
+{
+ struct crash_mem *cmem;
+ int ret;
+
+ cmem = fill_up_crash_elf_data();
+ if (!cmem)
+ return -ENOMEM;
+
+ ret = walk_system_ram_res(0, -1, cmem, prepare_elf64_ram_headers_callback);
+ if (ret)
+ goto out;
+
+ /* Exclude unwanted mem ranges */
+ ret = elf_header_exclude_ranges(cmem);
+ if (ret)
+ goto out;
+
+ /* By default prepare 64bit headers */
+ ret = crash_prepare_elf64_headers(cmem, IS_ENABLED(CONFIG_X86_64), addr, sz);
+
+out:
+ vfree(cmem);
+ return ret;
+}
+
+static int add_e820_entry(struct boot_params *params, struct e820_entry *entry)
+{
+ unsigned int nr_e820_entries;
+
+ nr_e820_entries = params->e820_entries;
+ if (nr_e820_entries >= E820_MAX_ENTRIES_ZEROPAGE)
+ return 1;
+
+ memcpy(&params->e820_table[nr_e820_entries], entry, sizeof(struct e820_entry));
+ params->e820_entries++;
+ return 0;
+}
+
+static int memmap_entry_callback(struct resource *res, void *arg)
+{
+ struct crash_memmap_data *cmd = arg;
+ struct boot_params *params = cmd->params;
+ struct e820_entry ei;
+
+ ei.addr = res->start;
+ ei.size = resource_size(res);
+ ei.type = cmd->type;
+ add_e820_entry(params, &ei);
+
+ return 0;
+}
+
+static int memmap_exclude_ranges(struct kimage *image, struct crash_mem *cmem,
+ unsigned long long mstart,
+ unsigned long long mend)
+{
+ unsigned long start, end;
+
+ cmem->ranges[0].start = mstart;
+ cmem->ranges[0].end = mend;
+ cmem->nr_ranges = 1;
+
+ /* Exclude elf header region */
+ start = image->elf_load_addr;
+ end = start + image->elf_headers_sz - 1;
+ return crash_exclude_mem_range(cmem, start, end);
+}
+
+/* Prepare memory map for crash dump kernel */
+int crash_setup_memmap_entries(struct kimage *image, struct boot_params *params)
+{
+ int i, ret = 0;
+ unsigned long flags;
+ struct e820_entry ei;
+ struct crash_memmap_data cmd;
+ struct crash_mem *cmem;
+
+ cmem = vzalloc(struct_size(cmem, ranges, 1));
+ if (!cmem)
+ return -ENOMEM;
+
+ memset(&cmd, 0, sizeof(struct crash_memmap_data));
+ cmd.params = params;
+
+ /* Add the low 1M */
+ cmd.type = E820_TYPE_RAM;
+ flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ walk_iomem_res_desc(IORES_DESC_NONE, flags, 0, (1<<20)-1, &cmd,
+ memmap_entry_callback);
+
+ /* Add ACPI tables */
+ cmd.type = E820_TYPE_ACPI;
+ flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ walk_iomem_res_desc(IORES_DESC_ACPI_TABLES, flags, 0, -1, &cmd,
+ memmap_entry_callback);
+
+ /* Add ACPI Non-volatile Storage */
+ cmd.type = E820_TYPE_NVS;
+ walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1, &cmd,
+ memmap_entry_callback);
+
+ /* Add e820 reserved ranges */
+ cmd.type = E820_TYPE_RESERVED;
+ flags = IORESOURCE_MEM;
+ walk_iomem_res_desc(IORES_DESC_RESERVED, flags, 0, -1, &cmd,
+ memmap_entry_callback);
+
+ /* Add crashk_low_res region */
+ if (crashk_low_res.end) {
+ ei.addr = crashk_low_res.start;
+ ei.size = resource_size(&crashk_low_res);
+ ei.type = E820_TYPE_RAM;
+ add_e820_entry(params, &ei);
+ }
+
+ /* Exclude some ranges from crashk_res and add rest to memmap */
+ ret = memmap_exclude_ranges(image, cmem, crashk_res.start, crashk_res.end);
+ if (ret)
+ goto out;
+
+ for (i = 0; i < cmem->nr_ranges; i++) {
+ ei.size = cmem->ranges[i].end - cmem->ranges[i].start + 1;
+
+ /* If entry is less than a page, skip it */
+ if (ei.size < PAGE_SIZE)
+ continue;
+ ei.addr = cmem->ranges[i].start;
+ ei.type = E820_TYPE_RAM;
+ add_e820_entry(params, &ei);
+ }
+
+out:
+ vfree(cmem);
+ return ret;
+}
+
+int crash_load_segments(struct kimage *image)
+{
+ int ret;
+ struct kexec_buf kbuf = { .image = image, .buf_min = 0,
+ .buf_max = ULONG_MAX, .top_down = false };
+
+ /* Prepare elf headers and add a segment */
+ ret = prepare_elf_headers(image, &kbuf.buffer, &kbuf.bufsz);
+ if (ret)
+ return ret;
+
+ image->elf_headers = kbuf.buffer;
+ image->elf_headers_sz = kbuf.bufsz;
+
+ kbuf.memsz = kbuf.bufsz;
+ kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
+ kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
+ ret = kexec_add_buffer(&kbuf);
+ if (ret)
+ return ret;
+ image->elf_load_addr = kbuf.mem;
+ pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+ image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
+
+ return ret;
+}
+#endif /* CONFIG_KEXEC_FILE */
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