linux-kernel - [PATCH v3] x86/mce: retrieve poison range from hardware

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Date:   Sun, 17 Jul 2022 17:48:05 -0600
From:   Jane Chu <jane.chu@...cle.com>
To:     tony.luck@...el.com, bp@...en8.de, tglx@...utronix.de,
        mingo@...hat.com, dave.hansen@...ux.intel.com, x86@...nel.org,
        linux-edac@...r.kernel.org, dan.j.williams@...el.com,
        linux-kernel@...r.kernel.org, hch@....de, nvdimm@...ts.linux.dev
Subject: [PATCH v3] x86/mce: retrieve poison range from hardware

With Commit 7917f9cdb503 ("acpi/nfit: rely on mce->misc to determine
poison granularity") that changed nfit_handle_mce() callback to report
badrange according to 1ULL << MCI_MISC_ADDR_LSB(mce->misc), it's been
discovered that the mce->misc LSB field is 0x1000 bytes, hence injecting
2 back-to-back poisons and the driver ends up logging 8 badblocks,
because 0x1000 bytes is 8 512-byte.

Dan Williams noticed that apei_mce_report_mem_error() hardcode
the LSB field to PAGE_SHIFT instead of consulting the input
struct cper_sec_mem_err record.  So change to rely on hardware whenever
support is available.

Link: https://lore.kernel.org/r/7ed50fd8-521e-cade-77b1-738b8bfb8502@oracle.com

Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Jane Chu <jane.chu@...cle.com>
---
 arch/x86/kernel/cpu/mce/apei.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mce/apei.c b/arch/x86/kernel/cpu/mce/apei.c
index 717192915f28..a8274fd57add 100644
--- a/arch/x86/kernel/cpu/mce/apei.c
+++ b/arch/x86/kernel/cpu/mce/apei.c
@@ -37,7 +37,7 @@ void apei_mce_report_mem_error(int severity, struct cper_sec_mem_err *mem_err)
 	m.bank = -1;
 	/* Fake a memory read error with unknown channel */
 	m.status = MCI_STATUS_VAL | MCI_STATUS_EN | MCI_STATUS_ADDRV | MCI_STATUS_MISCV | 0x9f;
-	m.misc = (MCI_MISC_ADDR_PHYS << 6) | PAGE_SHIFT;
+	m.misc = (MCI_MISC_ADDR_PHYS << 6) | __ffs64(mem_err->physical_addr_mask);

 	if (severity >= GHES_SEV_RECOVERABLE)
 		m.status |= MCI_STATUS_UC;
-- 
2.18.4