static __init int dev_mcelog_init_device(void) { int err; /* register character device /dev/mcelog */ err = misc_register(&mce_chrdev_device); if (err) { pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err); return err; } mce_register_decode_chain(&dev_mcelog_nb); return 0; }
static int __init extlog_init(void) { struct extlog_l1_head *l1_head; void __iomem *extlog_l1_hdr; size_t l1_hdr_size; struct resource *r; u64 cap; int rc; rc = -ENODEV; rdmsrl(MSR_IA32_MCG_CAP, cap); if (!(cap & MCG_ELOG_P)) return rc; if (!extlog_get_l1addr()) return rc; rc = -EINVAL; /* get L1 header to fetch necessary information */ l1_hdr_size = sizeof(struct extlog_l1_head); r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR"); if (!r) { pr_warn(FW_BUG EMCA_BUG, (unsigned long long)l1_dirbase, (unsigned long long)l1_dirbase + l1_hdr_size); goto err; } extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size); l1_head = (struct extlog_l1_head *)extlog_l1_hdr; l1_size = l1_head->total_len; l1_percpu_entry = l1_head->entries; elog_base = l1_head->elog_base; elog_size = l1_head->elog_len; acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size); release_mem_region(l1_dirbase, l1_hdr_size); /* remap L1 header again based on completed information */ r = request_mem_region(l1_dirbase, l1_size, "L1 Table"); if (!r) { pr_warn(FW_BUG EMCA_BUG, (unsigned long long)l1_dirbase, (unsigned long long)l1_dirbase + l1_size); goto err; } extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size); l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size); /* remap elog table */ r = request_mem_region(elog_base, elog_size, "Elog Table"); if (!r) { pr_warn(FW_BUG EMCA_BUG, (unsigned long long)elog_base, (unsigned long long)elog_base + elog_size); goto err_release_l1_dir; } elog_addr = acpi_os_map_memory(elog_base, elog_size); rc = -ENOMEM; /* allocate buffer to save elog record */ elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL); if (elog_buf == NULL) goto err_release_elog; mce_register_decode_chain(&extlog_mce_dec); /* enable OS to be involved to take over management from BIOS */ ((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN; return 0; err_release_elog: if (elog_addr) acpi_os_unmap_memory(elog_addr, elog_size); release_mem_region(elog_base, elog_size); err_release_l1_dir: if (extlog_l1_addr) acpi_os_unmap_memory(extlog_l1_addr, l1_size); release_mem_region(l1_dirbase, l1_size); err: pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n"); return rc; }