From fd0f5ffff8a21fd9a32688b850c5bd694e76cc27 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Mon, 17 Feb 2014 20:51:52 +0100 Subject: [PATCH] MCE, AMD: Fix decoding module loading on unsupported hw We want to still be able to issue some error information on systems for which there is no decoding support (think older distro kernels here, for example). Therefore, we allow module registration but skip the per-family bank-specific decoders and issue the general information only, i.e.: [ 46.822828] [Hardware Error]: Error Status: Uncorrected, software containable error. [ 46.822846] [Hardware Error]: CPU:0 (15:30:0) MC0_STATUS[-|UE|-|-|-|-|-]: 0xa000000000010f0f [ 46.822858] [Hardware Error]: cache level: L3/GEN, mem/io: GEN, mem-tx: GEN, part-proc: GEN (timed out) with the hope that it still contains helpful useful bits. Suggested-by: Aravind Gopalakrishnan Tested-by: Aravind Gopalakrishnan Link: http://lkml.kernel.org/r/1392659391-2411-1-git-send-email-Aravind.Gopalakrishnan@amd.com Signed-off-by: Borislav Petkov --- drivers/edac/mce_amd.c | 65 +++++++++++++++++++++--------------------- 1 file changed, 33 insertions(+), 32 deletions(-) diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c index 30f7309446a6..51b9caa0b024 100644 --- a/drivers/edac/mce_amd.c +++ b/drivers/edac/mce_amd.c @@ -741,6 +741,36 @@ int amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data) if (amd_filter_mce(m)) return NOTIFY_STOP; + pr_emerg(HW_ERR "%s\n", decode_error_status(m)); + + pr_emerg(HW_ERR "CPU:%d (%x:%x:%x) MC%d_STATUS[%s|%s|%s|%s|%s", + m->extcpu, + c->x86, c->x86_model, c->x86_mask, + m->bank, + ((m->status & MCI_STATUS_OVER) ? "Over" : "-"), + ((m->status & MCI_STATUS_UC) ? "UE" : "CE"), + ((m->status & MCI_STATUS_MISCV) ? "MiscV" : "-"), + ((m->status & MCI_STATUS_PCC) ? "PCC" : "-"), + ((m->status & MCI_STATUS_ADDRV) ? "AddrV" : "-")); + + if (c->x86 == 0x15 || c->x86 == 0x16) + pr_cont("|%s|%s", + ((m->status & MCI_STATUS_DEFERRED) ? "Deferred" : "-"), + ((m->status & MCI_STATUS_POISON) ? "Poison" : "-")); + + /* do the two bits[14:13] together */ + ecc = (m->status >> 45) & 0x3; + if (ecc) + pr_cont("|%sECC", ((ecc == 2) ? "C" : "U")); + + pr_cont("]: 0x%016llx\n", m->status); + + if (m->status & MCI_STATUS_ADDRV) + pr_emerg(HW_ERR "MC%d_ADDR: 0x%016llx\n", m->bank, m->addr); + + if (!fam_ops) + goto err_code; + switch (m->bank) { case 0: decode_mc0_mce(m); @@ -774,33 +804,7 @@ int amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data) break; } - pr_emerg(HW_ERR "Error Status: %s\n", decode_error_status(m)); - - pr_emerg(HW_ERR "CPU:%d (%x:%x:%x) MC%d_STATUS[%s|%s|%s|%s|%s", - m->extcpu, - c->x86, c->x86_model, c->x86_mask, - m->bank, - ((m->status & MCI_STATUS_OVER) ? "Over" : "-"), - ((m->status & MCI_STATUS_UC) ? "UE" : "CE"), - ((m->status & MCI_STATUS_MISCV) ? "MiscV" : "-"), - ((m->status & MCI_STATUS_PCC) ? "PCC" : "-"), - ((m->status & MCI_STATUS_ADDRV) ? "AddrV" : "-")); - - if (c->x86 == 0x15 || c->x86 == 0x16) - pr_cont("|%s|%s", - ((m->status & MCI_STATUS_DEFERRED) ? "Deferred" : "-"), - ((m->status & MCI_STATUS_POISON) ? "Poison" : "-")); - - /* do the two bits[14:13] together */ - ecc = (m->status >> 45) & 0x3; - if (ecc) - pr_cont("|%sECC", ((ecc == 2) ? "C" : "U")); - - pr_cont("]: 0x%016llx\n", m->status); - - if (m->status & MCI_STATUS_ADDRV) - pr_emerg(HW_ERR "MC%d_ADDR: 0x%016llx\n", m->bank, m->addr); - + err_code: amd_decode_err_code(m->status & 0xffff); return NOTIFY_STOP; @@ -816,10 +820,7 @@ static int __init mce_amd_init(void) struct cpuinfo_x86 *c = &boot_cpu_data; if (c->x86_vendor != X86_VENDOR_AMD) - return 0; - - if (c->x86 < 0xf || c->x86 > 0x16) - return 0; + return -ENODEV; fam_ops = kzalloc(sizeof(struct amd_decoder_ops), GFP_KERNEL); if (!fam_ops) @@ -874,7 +875,7 @@ static int __init mce_amd_init(void) default: printk(KERN_WARNING "Huh? What family is it: 0x%x?!\n", c->x86); kfree(fam_ops); - return -EINVAL; + fam_ops = NULL; } pr_info("MCE: In-kernel MCE decoding enabled.\n"); -- 2.20.1