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From: Borislav Petkov <bp@alien8.de>
To: X86 ML <x86@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 7/8] x86/MCE/AMD: Get address from already initialized block
Date: Wed, 21 Feb 2018 11:18:59 +0100	[thread overview]
Message-ID: <20180221101900.10326-8-bp@alien8.de> (raw)
In-Reply-To: <20180221101900.10326-1-bp@alien8.de>

From: Yazen Ghannam <yazen.ghannam@amd.com>

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@amd.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: x86-ml <x86@kernel.org>
Cc: <stable@vger.kernel.org> # 4.14.x
Link: https://lkml.kernel.org/r/20180215210943.11530-3-Yazen.Ghannam@amd.com
Signed-off-by: Borislav Petkov <bp@suse.de>
---
 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 d8ba9d0c3f01..12bc2863a4d6 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;
-- 
2.13.0

  parent reply	other threads:[~2018-02-21 10:19 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-21 10:18 [PATCH 0/8] x86/RAS: Some accumulated stuff Borislav Petkov
2018-02-21 10:18 ` [PATCH 1/8] x86/MCE: Put private structures and definitions into the internal header Borislav Petkov
2018-02-21 11:39   ` Ingo Molnar
2018-02-21 13:28     ` Borislav Petkov
2018-02-21 17:58   ` [tip:ras/core] x86/mce: " tip-bot for Borislav Petkov
2018-02-21 10:18 ` [PATCH 2/8] x86/MCE: Convert mca_config bools to a bitfield Borislav Petkov
2018-02-21 17:58   ` [tip:ras/core] x86/mce: Convert 'struct mca_config' " tip-bot for Borislav Petkov
2018-02-21 10:18 ` [PATCH 3/8] x86/mce: Issue the mcelog --ascii message on !AMD Borislav Petkov
2018-02-21 17:59   ` [tip:ras/core] x86/mce: Issue the 'mcelog --ascii' message only " tip-bot for Borislav Petkov
2018-02-21 10:18 ` [PATCH 4/8] x86/MCE/AMD: Collect error info even if valid bits are not set Borislav Petkov
2018-02-21 17:59   ` [tip:ras/core] x86/mce/AMD: " tip-bot for Borislav Petkov
2018-02-21 10:18 ` [PATCH 5/8] x86/MCE/AMD: Pass the bank number to smca_get_bank_type() Borislav Petkov
2018-02-21 18:00   ` [tip:ras/core] x86/mce/AMD: " tip-bot for Yazen Ghannam
2018-02-21 10:18 ` [PATCH 6/8] x86/MCE/AMD, EDAC/mce_amd: Enumerate Reserved SMCA bank type Borislav Petkov
2018-02-21 18:00   ` [tip:ras/core] x86/mce/AMD, " tip-bot for Yazen Ghannam
2018-02-21 10:18 ` Borislav Petkov [this message]
2018-02-21 18:01   ` [tip:ras/core] x86/mce/AMD: Get address from already initialized block tip-bot for Yazen Ghannam
2018-02-21 10:19 ` [PATCH 8/8] x86/MCE/AMD: Carve out SMCA get_block_address() code Borislav Petkov

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