linux-kernel - [tip:ras/core] x86/mce/AMD: Get address from already initialized block

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Message-ID: <tip-27bd59502702fe51d9eb00450a75b727ec6bfcb4@git.kernel.org>
Date:   Wed, 21 Feb 2018 10:01:07 -0800
From:   tip-bot for Yazen Ghannam <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     bp@...en8.de, linux-edac@...r.kernel.org, peterz@...radead.org,
        mingo@...nel.org, tony.luck@...el.com, hpa@...or.com,
        tglx@...utronix.de, bp@...e.de, yazen.ghannam@....com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [tip:ras/core] x86/mce/AMD: Get address from already initialized
 block

Commit-ID:  27bd59502702fe51d9eb00450a75b727ec6bfcb4
Gitweb:     https://git.kernel.org/tip/27bd59502702fe51d9eb00450a75b727ec6bfcb4
Author:     Yazen Ghannam <yazen.ghannam@....com>
AuthorDate: Wed, 21 Feb 2018 11:18:59 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 21 Feb 2018 17:00:55 +0100

x86/mce/AMD: Get address from already initialized block

The block address is saved after the block is initialized when
threshold_init_device() is called.

Use the saved block address, if available, rather than trying to
rediscover it.

This will avoid a call trace, when resuming from suspend, due to the
rdmsr_safe_on_cpu() call in get_block_address(). The rdmsr_safe_on_cpu()
call issues an IPI but we're running with interrupts disabled. This
triggers:

    WARNING: CPU: 0 PID: 11523 at kernel/smp.c:291 smp_call_function_single+0xdc/0xe0

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: <stable@...r.kernel.org> # 4.14.x
Cc: Borislav Petkov <bp@...en8.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-edac <linux-edac@...r.kernel.org>
Link: http://lkml.kernel.org/r/20180221101900.10326-8-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/mcheck/mce_amd.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index d8ba9d0..12bc286 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -436,6 +436,21 @@ static u32 get_block_address(unsigned int cpu, u32 current_addr, u32 low, u32 hi
 {
 	u32 addr = 0, offset = 0;
 
+	if ((bank >= mca_cfg.banks) || (block >= NR_BLOCKS))
+		return addr;
+
+	/* Get address from already initialized block. */
+	if (per_cpu(threshold_banks, cpu)) {
+		struct threshold_bank *bankp = per_cpu(threshold_banks, cpu)[bank];
+
+		if (bankp && bankp->blocks) {
+			struct threshold_block *blockp = &bankp->blocks[block];
+
+			if (blockp)
+				return blockp->address;
+		}
+	}
+
 	if (mce_flags.smca) {
 		if (smca_get_bank_type(bank) == SMCA_RESERVED)
 			return addr;