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;
}
