linux-kernel - [PATCH v9 1/7] acpi/nfit: rely on mce->misc to determine poison granularity

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Date:   Fri, 22 Apr 2022 16:45:02 -0600
From:   Jane Chu <jane.chu@...cle.com>
To:     dan.j.williams@...el.com, bp@...en8.de, hch@...radead.org,
        dave.hansen@...el.com, peterz@...radead.org, luto@...nel.org,
        david@...morbit.com, djwong@...nel.org,
        linux-fsdevel@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     vishal.l.verma@...el.com, dave.jiang@...el.com, agk@...hat.com,
        snitzer@...hat.com, dm-devel@...hat.com, ira.weiny@...el.com,
        willy@...radead.org, vgoyal@...hat.com
Subject: [PATCH v9 1/7] acpi/nfit: rely on mce->misc to determine poison granularity

nfit_handle_mec() hardcode poison granularity at L1_CACHE_BYTES.
Instead, let the driver rely on mce->misc register to determine
the poison granularity.

Suggested-by: Dan Williams <dan.j.williams@...el.com>
Reviewed-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Jane Chu <jane.chu@...cle.com>
---
 drivers/acpi/nfit/mce.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/nfit/mce.c b/drivers/acpi/nfit/mce.c
index ee8d9973f60b..d48a388b796e 100644
--- a/drivers/acpi/nfit/mce.c
+++ b/drivers/acpi/nfit/mce.c
@@ -32,6 +32,7 @@ static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
 	 */
 	mutex_lock(&acpi_desc_lock);
 	list_for_each_entry(acpi_desc, &acpi_descs, list) {
+		unsigned int align = 1UL << MCI_MISC_ADDR_LSB(mce->misc);
 		struct device *dev = acpi_desc->dev;
 		int found_match = 0;
 
@@ -63,8 +64,7 @@ static int nfit_handle_mce(struct notifier_block *nb, unsigned long val,
 
 		/* If this fails due to an -ENOMEM, there is little we can do */
 		nvdimm_bus_add_badrange(acpi_desc->nvdimm_bus,
-				ALIGN(mce->addr, L1_CACHE_BYTES),
-				L1_CACHE_BYTES);
+				ALIGN_DOWN(mce->addr, align), align);
 		nvdimm_region_notify(nfit_spa->nd_region,
 				NVDIMM_REVALIDATE_POISON);
 
-- 
2.18.4