powerpc/opalcore: export /sys/firmware/opal/core for analysing opal crashes
Export /sys/firmware/opal/core file to analyze opal crashes. Since OPAL core can be generated independent of CONFIG_FA_DUMP support in kernel, add this support under a new kernel config option CONFIG_OPAL_CORE. Also, avoid code duplication by moving common code used while exporting /proc/vmcore and/or /sys/firmware/opal/core file(s). Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821378503.5656.3693769384945087756.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini
Michael Ellerman
Родитель
58cf055df4
Коммит
6f713d1814
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@ -592,6 +592,15 @@ config PRESERVE_FA_DUMP
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memory preserving kernel boot would process this crash data.
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Petitboot kernel is the typical usecase for this option.
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config OPAL_CORE
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bool "Export OPAL memory as /sys/firmware/opal/core"
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depends on PPC64 && PPC_POWERNV
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help
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This option uses the MPIPL support in firmware to provide an
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ELF core of OPAL memory after a crash. The ELF core is exported
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as /sys/firmware/opal/core file which is helpful in debugging
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OPAL crashes using GDB.
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config IRQ_ALL_CPUS
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bool "Distribute interrupts on all CPUs by default"
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depends on SMP
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@ -9,6 +9,7 @@ obj-y += ultravisor.o
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obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
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obj-$(CONFIG_FA_DUMP) += opal-fadump.o
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obj-$(CONFIG_PRESERVE_FA_DUMP) += opal-fadump.o
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obj-$(CONFIG_OPAL_CORE) += opal-core.o
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obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o
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obj-$(CONFIG_CXL_BASE) += pci-cxl.o
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obj-$(CONFIG_EEH) += eeh-powernv.o
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@ -0,0 +1,598 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Interface for exporting the OPAL ELF core.
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* Heavily inspired from fs/proc/vmcore.c
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*
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* Copyright 2019, Hari Bathini, IBM Corporation.
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*/
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#define pr_fmt(fmt) "opal core: " fmt
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#include <linux/memblock.h>
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#include <linux/uaccess.h>
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#include <linux/proc_fs.h>
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#include <linux/elf.h>
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#include <linux/elfcore.h>
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#include <linux/slab.h>
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#include <linux/crash_core.h>
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#include <linux/of.h>
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#include <asm/page.h>
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#include <asm/opal.h>
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#include <asm/fadump-internal.h>
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#include "opal-fadump.h"
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#define MAX_PT_LOAD_CNT 8
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/* NT_AUXV note related info */
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#define AUXV_CNT 1
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#define AUXV_DESC_SZ (((2 * AUXV_CNT) + 1) * sizeof(Elf64_Off))
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struct opalcore_config {
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u32 num_cpus;
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/* PIR value of crashing CPU */
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u32 crashing_cpu;
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/* CPU state data info from F/W */
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u64 cpu_state_destination_vaddr;
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u64 cpu_state_data_size;
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u64 cpu_state_entry_size;
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/* OPAL memory to be exported as PT_LOAD segments */
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u64 ptload_addr[MAX_PT_LOAD_CNT];
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u64 ptload_size[MAX_PT_LOAD_CNT];
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u64 ptload_cnt;
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/* Pointer to the first PT_LOAD in the ELF core file */
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Elf64_Phdr *ptload_phdr;
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/* Total size of opalcore file. */
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size_t opalcore_size;
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/* Buffer for all the ELF core headers and the PT_NOTE */
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size_t opalcorebuf_sz;
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char *opalcorebuf;
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/* NT_AUXV buffer */
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char auxv_buf[AUXV_DESC_SZ];
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};
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struct opalcore {
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struct list_head list;
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u64 paddr;
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size_t size;
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loff_t offset;
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};
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static LIST_HEAD(opalcore_list);
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static struct opalcore_config *oc_conf;
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static const struct opal_mpipl_fadump *opalc_metadata;
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static const struct opal_mpipl_fadump *opalc_cpu_metadata;
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/*
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* Set crashing CPU's signal to SIGUSR1. if the kernel is triggered
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* by kernel, SIGTERM otherwise.
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*/
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bool kernel_initiated;
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static struct opalcore * __init get_new_element(void)
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{
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return kzalloc(sizeof(struct opalcore), GFP_KERNEL);
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}
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static inline int is_opalcore_usable(void)
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{
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return (oc_conf && oc_conf->opalcorebuf != NULL) ? 1 : 0;
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}
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static Elf64_Word *append_elf64_note(Elf64_Word *buf, char *name,
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u32 type, void *data,
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size_t data_len)
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{
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Elf64_Nhdr *note = (Elf64_Nhdr *)buf;
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Elf64_Word namesz = strlen(name) + 1;
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note->n_namesz = cpu_to_be32(namesz);
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note->n_descsz = cpu_to_be32(data_len);
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note->n_type = cpu_to_be32(type);
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buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf64_Word));
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memcpy(buf, name, namesz);
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buf += DIV_ROUND_UP(namesz, sizeof(Elf64_Word));
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memcpy(buf, data, data_len);
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buf += DIV_ROUND_UP(data_len, sizeof(Elf64_Word));
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return buf;
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}
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static void fill_prstatus(struct elf_prstatus *prstatus, int pir,
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struct pt_regs *regs)
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{
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memset(prstatus, 0, sizeof(struct elf_prstatus));
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elf_core_copy_kernel_regs(&(prstatus->pr_reg), regs);
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/*
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* Overload PID with PIR value.
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* As a PIR value could also be '0', add an offset of '100'
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* to every PIR to avoid misinterpretations in GDB.
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*/
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prstatus->pr_pid = cpu_to_be32(100 + pir);
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prstatus->pr_ppid = cpu_to_be32(1);
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/*
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* Indicate SIGUSR1 for crash initiated from kernel.
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* SIGTERM otherwise.
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*/
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if (pir == oc_conf->crashing_cpu) {
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short sig;
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sig = kernel_initiated ? SIGUSR1 : SIGTERM;
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prstatus->pr_cursig = cpu_to_be16(sig);
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}
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}
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static Elf64_Word *auxv_to_elf64_notes(Elf64_Word *buf,
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u64 opal_boot_entry)
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{
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Elf64_Off *bufp = (Elf64_Off *)oc_conf->auxv_buf;
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int idx = 0;
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memset(bufp, 0, AUXV_DESC_SZ);
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/* Entry point of OPAL */
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bufp[idx++] = cpu_to_be64(AT_ENTRY);
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bufp[idx++] = cpu_to_be64(opal_boot_entry);
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/* end of vector */
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bufp[idx++] = cpu_to_be64(AT_NULL);
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buf = append_elf64_note(buf, CRASH_CORE_NOTE_NAME, NT_AUXV,
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oc_conf->auxv_buf, AUXV_DESC_SZ);
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return buf;
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}
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/*
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* Read from the ELF header and then the crash dump.
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* Returns number of bytes read on success, -errno on failure.
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*/
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static ssize_t read_opalcore(struct file *file, struct kobject *kobj,
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struct bin_attribute *bin_attr, char *to,
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loff_t pos, size_t count)
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{
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struct opalcore *m;
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ssize_t tsz, avail;
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loff_t tpos = pos;
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if (pos >= oc_conf->opalcore_size)
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return 0;
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/* Adjust count if it goes beyond opalcore size */
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avail = oc_conf->opalcore_size - pos;
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if (count > avail)
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count = avail;
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if (count == 0)
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return 0;
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/* Read ELF core header and/or PT_NOTE segment */
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if (tpos < oc_conf->opalcorebuf_sz) {
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tsz = min_t(size_t, oc_conf->opalcorebuf_sz - tpos, count);
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memcpy(to, oc_conf->opalcorebuf + tpos, tsz);
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to += tsz;
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tpos += tsz;
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count -= tsz;
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}
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list_for_each_entry(m, &opalcore_list, list) {
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/* nothing more to read here */
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if (count == 0)
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break;
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if (tpos < m->offset + m->size) {
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void *addr;
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tsz = min_t(size_t, m->offset + m->size - tpos, count);
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addr = (void *)(m->paddr + tpos - m->offset);
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memcpy(to, __va(addr), tsz);
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to += tsz;
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tpos += tsz;
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count -= tsz;
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}
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}
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return (tpos - pos);
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}
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static struct bin_attribute opal_core_attr = {
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.attr = {.name = "core", .mode = 0400},
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.read = read_opalcore
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};
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/*
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* Read CPU state dump data and convert it into ELF notes.
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*
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* Each register entry is of 16 bytes, A numerical identifier along with
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* a GPR/SPR flag in the first 8 bytes and the register value in the next
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* 8 bytes. For more details refer to F/W documentation.
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*/
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static Elf64_Word * __init opalcore_append_cpu_notes(Elf64_Word *buf)
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{
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u32 thread_pir, size_per_thread, regs_offset, regs_cnt, reg_esize;
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struct hdat_fadump_thread_hdr *thdr;
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struct elf_prstatus prstatus;
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Elf64_Word *first_cpu_note;
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struct pt_regs regs;
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char *bufp;
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int i;
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size_per_thread = oc_conf->cpu_state_entry_size;
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bufp = __va(oc_conf->cpu_state_destination_vaddr);
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/*
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* Offset for register entries, entry size and registers count is
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* duplicated in every thread header in keeping with HDAT format.
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* Use these values from the first thread header.
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*/
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thdr = (struct hdat_fadump_thread_hdr *)bufp;
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regs_offset = (offsetof(struct hdat_fadump_thread_hdr, offset) +
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be32_to_cpu(thdr->offset));
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reg_esize = be32_to_cpu(thdr->esize);
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regs_cnt = be32_to_cpu(thdr->ecnt);
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pr_debug("--------CPU State Data------------\n");
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pr_debug("NumCpus : %u\n", oc_conf->num_cpus);
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pr_debug("\tOffset: %u, Entry size: %u, Cnt: %u\n",
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regs_offset, reg_esize, regs_cnt);
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/*
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* Skip past the first CPU note. Fill this note with the
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* crashing CPU's prstatus.
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*/
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first_cpu_note = buf;
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buf = append_elf64_note(buf, CRASH_CORE_NOTE_NAME, NT_PRSTATUS,
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&prstatus, sizeof(prstatus));
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for (i = 0; i < oc_conf->num_cpus; i++, bufp += size_per_thread) {
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thdr = (struct hdat_fadump_thread_hdr *)bufp;
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thread_pir = be32_to_cpu(thdr->pir);
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pr_debug("[%04d] PIR: 0x%x, core state: 0x%02x\n",
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i, thread_pir, thdr->core_state);
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/*
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* Register state data of MAX cores is provided by firmware,
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* but some of this cores may not be active. So, while
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* processing register state data, check core state and
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* skip threads that belong to inactive cores.
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*/
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if (thdr->core_state == HDAT_FADUMP_CORE_INACTIVE)
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continue;
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opal_fadump_read_regs((bufp + regs_offset), regs_cnt,
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reg_esize, false, ®s);
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pr_debug("PIR 0x%x - R1 : 0x%llx, NIP : 0x%llx\n", thread_pir,
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be64_to_cpu(regs.gpr[1]), be64_to_cpu(regs.nip));
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fill_prstatus(&prstatus, thread_pir, ®s);
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if (thread_pir != oc_conf->crashing_cpu) {
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buf = append_elf64_note(buf, CRASH_CORE_NOTE_NAME,
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NT_PRSTATUS, &prstatus,
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sizeof(prstatus));
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} else {
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/*
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* Add crashing CPU as the first NT_PRSTATUS note for
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* GDB to process the core file appropriately.
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*/
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append_elf64_note(first_cpu_note, CRASH_CORE_NOTE_NAME,
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NT_PRSTATUS, &prstatus,
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sizeof(prstatus));
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}
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}
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return buf;
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}
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static int __init create_opalcore(void)
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{
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u64 opal_boot_entry, opal_base_addr, paddr;
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u32 hdr_size, cpu_notes_size, count;
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struct device_node *dn;
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struct opalcore *new;
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loff_t opalcore_off;
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struct page *page;
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Elf64_Phdr *phdr;
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Elf64_Ehdr *elf;
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int i, ret;
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char *bufp;
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/* Get size of header & CPU notes for OPAL core */
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hdr_size = (sizeof(Elf64_Ehdr) +
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((oc_conf->ptload_cnt + 1) * sizeof(Elf64_Phdr)));
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cpu_notes_size = ((oc_conf->num_cpus * (CRASH_CORE_NOTE_HEAD_BYTES +
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CRASH_CORE_NOTE_NAME_BYTES +
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CRASH_CORE_NOTE_DESC_BYTES)) +
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(CRASH_CORE_NOTE_HEAD_BYTES +
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CRASH_CORE_NOTE_NAME_BYTES + AUXV_DESC_SZ));
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/* Allocate buffer to setup OPAL core */
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oc_conf->opalcorebuf_sz = PAGE_ALIGN(hdr_size + cpu_notes_size);
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oc_conf->opalcorebuf = alloc_pages_exact(oc_conf->opalcorebuf_sz,
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GFP_KERNEL | __GFP_ZERO);
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if (!oc_conf->opalcorebuf) {
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pr_err("Not enough memory to setup OPAL core (size: %lu)\n",
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oc_conf->opalcorebuf_sz);
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oc_conf->opalcorebuf_sz = 0;
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return -ENOMEM;
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}
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count = oc_conf->opalcorebuf_sz / PAGE_SIZE;
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page = virt_to_page(oc_conf->opalcorebuf);
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for (i = 0; i < count; i++)
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mark_page_reserved(page + i);
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pr_debug("opalcorebuf = 0x%llx\n", (u64)oc_conf->opalcorebuf);
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/* Read OPAL related device-tree entries */
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dn = of_find_node_by_name(NULL, "ibm,opal");
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if (dn) {
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ret = of_property_read_u64(dn, "opal-base-address",
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&opal_base_addr);
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pr_debug("opal-base-address: %llx\n", opal_base_addr);
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ret |= of_property_read_u64(dn, "opal-boot-address",
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&opal_boot_entry);
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pr_debug("opal-boot-address: %llx\n", opal_boot_entry);
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}
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if (!dn || ret)
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pr_warn("WARNING: Failed to read OPAL base & entry values\n");
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/* Use count to keep track of the program headers */
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count = 0;
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bufp = oc_conf->opalcorebuf;
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elf = (Elf64_Ehdr *)bufp;
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bufp += sizeof(Elf64_Ehdr);
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memcpy(elf->e_ident, ELFMAG, SELFMAG);
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elf->e_ident[EI_CLASS] = ELF_CLASS;
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elf->e_ident[EI_DATA] = ELFDATA2MSB;
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elf->e_ident[EI_VERSION] = EV_CURRENT;
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elf->e_ident[EI_OSABI] = ELF_OSABI;
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memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
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elf->e_type = cpu_to_be16(ET_CORE);
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elf->e_machine = cpu_to_be16(ELF_ARCH);
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elf->e_version = cpu_to_be32(EV_CURRENT);
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elf->e_entry = 0;
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elf->e_phoff = cpu_to_be64(sizeof(Elf64_Ehdr));
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elf->e_shoff = 0;
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elf->e_flags = 0;
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elf->e_ehsize = cpu_to_be16(sizeof(Elf64_Ehdr));
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elf->e_phentsize = cpu_to_be16(sizeof(Elf64_Phdr));
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elf->e_phnum = 0;
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elf->e_shentsize = 0;
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elf->e_shnum = 0;
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elf->e_shstrndx = 0;
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phdr = (Elf64_Phdr *)bufp;
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bufp += sizeof(Elf64_Phdr);
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phdr->p_type = cpu_to_be32(PT_NOTE);
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phdr->p_flags = 0;
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phdr->p_align = 0;
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phdr->p_paddr = phdr->p_vaddr = 0;
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phdr->p_offset = cpu_to_be64(hdr_size);
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phdr->p_filesz = phdr->p_memsz = cpu_to_be64(cpu_notes_size);
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count++;
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opalcore_off = oc_conf->opalcorebuf_sz;
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oc_conf->ptload_phdr = (Elf64_Phdr *)bufp;
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paddr = 0;
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for (i = 0; i < oc_conf->ptload_cnt; i++) {
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phdr = (Elf64_Phdr *)bufp;
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bufp += sizeof(Elf64_Phdr);
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phdr->p_type = cpu_to_be32(PT_LOAD);
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phdr->p_flags = cpu_to_be32(PF_R|PF_W|PF_X);
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phdr->p_align = 0;
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new = get_new_element();
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if (!new)
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return -ENOMEM;
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new->paddr = oc_conf->ptload_addr[i];
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new->size = oc_conf->ptload_size[i];
|
||||
new->offset = opalcore_off;
|
||||
list_add_tail(&new->list, &opalcore_list);
|
||||
|
||||
phdr->p_paddr = cpu_to_be64(paddr);
|
||||
phdr->p_vaddr = cpu_to_be64(opal_base_addr + paddr);
|
||||
phdr->p_filesz = phdr->p_memsz =
|
||||
cpu_to_be64(oc_conf->ptload_size[i]);
|
||||
phdr->p_offset = cpu_to_be64(opalcore_off);
|
||||
|
||||
count++;
|
||||
opalcore_off += oc_conf->ptload_size[i];
|
||||
paddr += oc_conf->ptload_size[i];
|
||||
}
|
||||
|
||||
elf->e_phnum = cpu_to_be16(count);
|
||||
|
||||
bufp = (char *)opalcore_append_cpu_notes((Elf64_Word *)bufp);
|
||||
bufp = (char *)auxv_to_elf64_notes((Elf64_Word *)bufp, opal_boot_entry);
|
||||
|
||||
oc_conf->opalcore_size = opalcore_off;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void opalcore_cleanup(void)
|
||||
{
|
||||
if (oc_conf == NULL)
|
||||
return;
|
||||
|
||||
/* Remove OPAL core sysfs file */
|
||||
sysfs_remove_bin_file(opal_kobj, &opal_core_attr);
|
||||
oc_conf->ptload_phdr = NULL;
|
||||
oc_conf->ptload_cnt = 0;
|
||||
|
||||
/* free the buffer used for setting up OPAL core */
|
||||
if (oc_conf->opalcorebuf) {
|
||||
void *end = (void *)((u64)oc_conf->opalcorebuf +
|
||||
oc_conf->opalcorebuf_sz);
|
||||
|
||||
free_reserved_area(oc_conf->opalcorebuf, end, -1, NULL);
|
||||
oc_conf->opalcorebuf = NULL;
|
||||
oc_conf->opalcorebuf_sz = 0;
|
||||
}
|
||||
|
||||
kfree(oc_conf);
|
||||
oc_conf = NULL;
|
||||
}
|
||||
__exitcall(opalcore_cleanup);
|
||||
|
||||
static void __init opalcore_config_init(void)
|
||||
{
|
||||
u32 idx, cpu_data_version;
|
||||
struct device_node *np;
|
||||
const __be32 *prop;
|
||||
u64 addr = 0;
|
||||
int i, ret;
|
||||
|
||||
np = of_find_node_by_path("/ibm,opal/dump");
|
||||
if (np == NULL)
|
||||
return;
|
||||
|
||||
if (!of_device_is_compatible(np, "ibm,opal-dump")) {
|
||||
pr_warn("Support missing for this f/w version!\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/* Check if dump has been initiated on last reboot */
|
||||
prop = of_get_property(np, "mpipl-boot", NULL);
|
||||
if (!prop) {
|
||||
of_node_put(np);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Get OPAL metadata */
|
||||
ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_OPAL, &addr);
|
||||
if ((ret != OPAL_SUCCESS) || !addr) {
|
||||
pr_err("Failed to get OPAL metadata (%d)\n", ret);
|
||||
goto error_out;
|
||||
}
|
||||
|
||||
addr = be64_to_cpu(addr);
|
||||
pr_debug("OPAL metadata addr: %llx\n", addr);
|
||||
opalc_metadata = __va(addr);
|
||||
|
||||
/* Get OPAL CPU metadata */
|
||||
ret = opal_mpipl_query_tag(OPAL_MPIPL_TAG_CPU, &addr);
|
||||
if ((ret != OPAL_SUCCESS) || !addr) {
|
||||
pr_err("Failed to get OPAL CPU metadata (%d)\n", ret);
|
||||
goto error_out;
|
||||
}
|
||||
|
||||
addr = be64_to_cpu(addr);
|
||||
pr_debug("CPU metadata addr: %llx\n", addr);
|
||||
opalc_cpu_metadata = __va(addr);
|
||||
|
||||
/* Allocate memory for config buffer */
|
||||
oc_conf = kzalloc(sizeof(struct opalcore_config), GFP_KERNEL);
|
||||
if (oc_conf == NULL)
|
||||
goto error_out;
|
||||
|
||||
/* Parse OPAL metadata */
|
||||
if (opalc_metadata->version != OPAL_MPIPL_VERSION) {
|
||||
pr_warn("Supported OPAL metadata version: %u, found: %u!\n",
|
||||
OPAL_MPIPL_VERSION, opalc_metadata->version);
|
||||
pr_warn("WARNING: F/W using newer OPAL metadata format!!\n");
|
||||
}
|
||||
|
||||
oc_conf->ptload_cnt = 0;
|
||||
idx = be32_to_cpu(opalc_metadata->region_cnt);
|
||||
if (idx > MAX_PT_LOAD_CNT) {
|
||||
pr_warn("WARNING: OPAL regions count (%d) adjusted to limit (%d)",
|
||||
MAX_PT_LOAD_CNT, idx);
|
||||
idx = MAX_PT_LOAD_CNT;
|
||||
}
|
||||
for (i = 0; i < idx; i++) {
|
||||
oc_conf->ptload_addr[oc_conf->ptload_cnt] =
|
||||
be64_to_cpu(opalc_metadata->region[i].dest);
|
||||
oc_conf->ptload_size[oc_conf->ptload_cnt++] =
|
||||
be64_to_cpu(opalc_metadata->region[i].size);
|
||||
}
|
||||
oc_conf->ptload_cnt = i;
|
||||
oc_conf->crashing_cpu = be32_to_cpu(opalc_metadata->crashing_pir);
|
||||
|
||||
if (!oc_conf->ptload_cnt) {
|
||||
pr_err("OPAL memory regions not found\n");
|
||||
goto error_out;
|
||||
}
|
||||
|
||||
/* Parse OPAL CPU metadata */
|
||||
cpu_data_version = be32_to_cpu(opalc_cpu_metadata->cpu_data_version);
|
||||
if (cpu_data_version != HDAT_FADUMP_CPU_DATA_VER) {
|
||||
pr_warn("Supported CPU data version: %u, found: %u!\n",
|
||||
HDAT_FADUMP_CPU_DATA_VER, cpu_data_version);
|
||||
pr_warn("WARNING: F/W using newer CPU state data format!!\n");
|
||||
}
|
||||
|
||||
addr = be64_to_cpu(opalc_cpu_metadata->region[0].dest);
|
||||
if (!addr) {
|
||||
pr_err("CPU state data not found!\n");
|
||||
goto error_out;
|
||||
}
|
||||
oc_conf->cpu_state_destination_vaddr = (u64)__va(addr);
|
||||
|
||||
oc_conf->cpu_state_data_size =
|
||||
be64_to_cpu(opalc_cpu_metadata->region[0].size);
|
||||
oc_conf->cpu_state_entry_size =
|
||||
be32_to_cpu(opalc_cpu_metadata->cpu_data_size);
|
||||
|
||||
if ((oc_conf->cpu_state_entry_size == 0) ||
|
||||
(oc_conf->cpu_state_entry_size > oc_conf->cpu_state_data_size)) {
|
||||
pr_err("CPU state data is invalid.\n");
|
||||
goto error_out;
|
||||
}
|
||||
oc_conf->num_cpus = (oc_conf->cpu_state_data_size /
|
||||
oc_conf->cpu_state_entry_size);
|
||||
|
||||
of_node_put(np);
|
||||
return;
|
||||
|
||||
error_out:
|
||||
pr_err("Could not export /sys/firmware/opal/core\n");
|
||||
opalcore_cleanup();
|
||||
of_node_put(np);
|
||||
}
|
||||
|
||||
static int __init opalcore_init(void)
|
||||
{
|
||||
int rc = -1;
|
||||
|
||||
opalcore_config_init();
|
||||
|
||||
if (oc_conf == NULL)
|
||||
return rc;
|
||||
|
||||
create_opalcore();
|
||||
|
||||
/*
|
||||
* If oc_conf->opalcorebuf= is set in the 2nd kernel,
|
||||
* then capture the dump.
|
||||
*/
|
||||
if (!(is_opalcore_usable())) {
|
||||
pr_err("Failed to export /sys/firmware/opal/core\n");
|
||||
opalcore_cleanup();
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* Set OPAL core file size */
|
||||
opal_core_attr.size = oc_conf->opalcore_size;
|
||||
|
||||
/* Export OPAL core sysfs file */
|
||||
rc = sysfs_create_bin_file(opal_kobj, &opal_core_attr);
|
||||
if (rc != 0) {
|
||||
pr_err("Failed to export /sys/firmware/opal/core\n");
|
||||
opalcore_cleanup();
|
||||
return rc;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
fs_initcall(opalcore_init);
|
||||
|
|
@ -85,6 +85,10 @@ static const struct opal_fadump_mem_struct *opal_fdm_active;
|
|||
static const struct opal_mpipl_fadump *opal_cpu_metadata;
|
||||
static struct opal_fadump_mem_struct *opal_fdm;
|
||||
|
||||
#ifdef CONFIG_OPAL_CORE
|
||||
extern bool kernel_initiated;
|
||||
#endif
|
||||
|
||||
static int opal_fadump_unregister(struct fw_dump *fadump_conf);
|
||||
|
||||
static void opal_fadump_update_config(struct fw_dump *fadump_conf,
|
||||
|
|
@ -349,62 +353,6 @@ static void opal_fadump_cleanup(struct fw_dump *fadump_conf)
|
|||
pr_warn("Could not reset (%llu) kernel metadata tag!\n", ret);
|
||||
}
|
||||
|
||||
static inline void opal_fadump_set_regval_regnum(struct pt_regs *regs,
|
||||
u32 reg_type, u32 reg_num,
|
||||
u64 reg_val)
|
||||
{
|
||||
if (reg_type == HDAT_FADUMP_REG_TYPE_GPR) {
|
||||
if (reg_num < 32)
|
||||
regs->gpr[reg_num] = reg_val;
|
||||
return;
|
||||
}
|
||||
|
||||
switch (reg_num) {
|
||||
case SPRN_CTR:
|
||||
regs->ctr = reg_val;
|
||||
break;
|
||||
case SPRN_LR:
|
||||
regs->link = reg_val;
|
||||
break;
|
||||
case SPRN_XER:
|
||||
regs->xer = reg_val;
|
||||
break;
|
||||
case SPRN_DAR:
|
||||
regs->dar = reg_val;
|
||||
break;
|
||||
case SPRN_DSISR:
|
||||
regs->dsisr = reg_val;
|
||||
break;
|
||||
case HDAT_FADUMP_REG_ID_NIP:
|
||||
regs->nip = reg_val;
|
||||
break;
|
||||
case HDAT_FADUMP_REG_ID_MSR:
|
||||
regs->msr = reg_val;
|
||||
break;
|
||||
case HDAT_FADUMP_REG_ID_CCR:
|
||||
regs->ccr = reg_val;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static inline void opal_fadump_read_regs(char *bufp, unsigned int regs_cnt,
|
||||
unsigned int reg_entry_size,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct hdat_fadump_reg_entry *reg_entry;
|
||||
int i;
|
||||
|
||||
memset(regs, 0, sizeof(struct pt_regs));
|
||||
|
||||
for (i = 0; i < regs_cnt; i++, bufp += reg_entry_size) {
|
||||
reg_entry = (struct hdat_fadump_reg_entry *)bufp;
|
||||
opal_fadump_set_regval_regnum(regs,
|
||||
be32_to_cpu(reg_entry->reg_type),
|
||||
be32_to_cpu(reg_entry->reg_num),
|
||||
be64_to_cpu(reg_entry->reg_val));
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Verify if CPU state data is available. If available, do a bit of sanity
|
||||
* checking before processing this data.
|
||||
|
|
@ -529,7 +477,7 @@ opal_fadump_build_cpu_notes(struct fw_dump *fadump_conf,
|
|||
continue;
|
||||
|
||||
opal_fadump_read_regs((bufp + regs_offset), regs_cnt,
|
||||
reg_esize, ®s);
|
||||
reg_esize, true, ®s);
|
||||
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
||||
pr_debug("CPU PIR: 0x%x - R1 : 0x%lx, NIP : 0x%lx\n",
|
||||
thread_pir, regs.gpr[1], regs.nip);
|
||||
|
|
@ -573,6 +521,18 @@ static int __init opal_fadump_process(struct fw_dump *fadump_conf)
|
|||
return rc;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_OPAL_CORE
|
||||
/*
|
||||
* If this is a kernel initiated crash, crashing_cpu would be set
|
||||
* appropriately and register data of the crashing CPU saved by
|
||||
* crashing kernel. Add this saved register data of crashing CPU
|
||||
* to elf notes and populate the pt_regs for the remaining CPUs
|
||||
* from register state data provided by firmware.
|
||||
*/
|
||||
if (fdh->crashing_cpu != FADUMP_CPU_UNKNOWN)
|
||||
kernel_initiated = true;
|
||||
#endif
|
||||
|
||||
rc = opal_fadump_build_cpu_notes(fadump_conf, fdh);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
|
|
|||
|
|
@ -8,6 +8,8 @@
|
|||
#ifndef _POWERNV_OPAL_FADUMP_H
|
||||
#define _POWERNV_OPAL_FADUMP_H
|
||||
|
||||
#include <asm/reg.h>
|
||||
|
||||
/*
|
||||
* OPAL FADump metadata structure format version
|
||||
*
|
||||
|
|
@ -77,4 +79,64 @@ struct hdat_fadump_reg_entry {
|
|||
__be64 reg_val;
|
||||
} __packed;
|
||||
|
||||
static inline void opal_fadump_set_regval_regnum(struct pt_regs *regs,
|
||||
u32 reg_type, u32 reg_num,
|
||||
u64 reg_val)
|
||||
{
|
||||
if (reg_type == HDAT_FADUMP_REG_TYPE_GPR) {
|
||||
if (reg_num < 32)
|
||||
regs->gpr[reg_num] = reg_val;
|
||||
return;
|
||||
}
|
||||
|
||||
switch (reg_num) {
|
||||
case SPRN_CTR:
|
||||
regs->ctr = reg_val;
|
||||
break;
|
||||
case SPRN_LR:
|
||||
regs->link = reg_val;
|
||||
break;
|
||||
case SPRN_XER:
|
||||
regs->xer = reg_val;
|
||||
break;
|
||||
case SPRN_DAR:
|
||||
regs->dar = reg_val;
|
||||
break;
|
||||
case SPRN_DSISR:
|
||||
regs->dsisr = reg_val;
|
||||
break;
|
||||
case HDAT_FADUMP_REG_ID_NIP:
|
||||
regs->nip = reg_val;
|
||||
break;
|
||||
case HDAT_FADUMP_REG_ID_MSR:
|
||||
regs->msr = reg_val;
|
||||
break;
|
||||
case HDAT_FADUMP_REG_ID_CCR:
|
||||
regs->ccr = reg_val;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static inline void opal_fadump_read_regs(char *bufp, unsigned int regs_cnt,
|
||||
unsigned int reg_entry_size,
|
||||
bool cpu_endian,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
struct hdat_fadump_reg_entry *reg_entry;
|
||||
u64 val;
|
||||
int i;
|
||||
|
||||
memset(regs, 0, sizeof(struct pt_regs));
|
||||
|
||||
for (i = 0; i < regs_cnt; i++, bufp += reg_entry_size) {
|
||||
reg_entry = (struct hdat_fadump_reg_entry *)bufp;
|
||||
val = (cpu_endian ? be64_to_cpu(reg_entry->reg_val) :
|
||||
reg_entry->reg_val);
|
||||
opal_fadump_set_regval_regnum(regs,
|
||||
be32_to_cpu(reg_entry->reg_type),
|
||||
be32_to_cpu(reg_entry->reg_num),
|
||||
val);
|
||||
}
|
||||
}
|
||||
|
||||
#endif /* _POWERNV_OPAL_FADUMP_H */
|
||||
|
|
|
|||
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