linux-kernel - [PATCH 3/3] RAS/CEC: immediate soft-offline page when count

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Message-Id: <20190418034115.75954-3-chao.wang@ucloud.cn>
Date:   Thu, 18 Apr 2019 11:41:15 +0800
From:   WANG Chao <chao.wang@...oud.cn>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
        linux-edac@...r.kernel.org
Subject: [PATCH 3/3] RAS/CEC: immediate soft-offline page when count_threshold == 1

count_threshol == 1 isn't working as expected. CEC only does soft
offline the second time the same pfn is hit by a correctable error.

Signed-off-by: WANG Chao <chao.wang@...oud.cn>
---
 drivers/ras/cec.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index 702e4c02c713..ac879c45377c 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -272,7 +272,22 @@ static u64 __maybe_unused del_lru_elem(void)
 	return pfn;
 }
 
+static void cec_valid_soft_offline(u64 pfn)
+{
+	if (!pfn_valid(pfn)) {
+		pr_warn("CEC: Invalid pfn: 0x%llx\n", pfn);
+	} else {
+		/* We have reached max count for this page, soft-offline it. */
+		pr_err("Soft-offlining pfn: 0x%llx\n", pfn);
+		memory_failure_queue(pfn, MF_SOFT_OFFLINE, &cec_chain);
+		ce_arr.pfns_poisoned++;
+	}
+}
 
+/*
+ * Return a >0 value to denote that we've reached the offlining
+ * threshold.
+ */
 int cec_add_elem(u64 pfn)
 {
 	struct ce_array *ca = &ce_arr;
@@ -295,6 +310,11 @@ int cec_add_elem(u64 pfn)
 
 	ret = find_elem(ca, pfn, &to);
 	if (ret < 0) {
+		if (count_threshold == 1) {
+			cec_valid_soft_offline(pfn);
+			ret = 1;
+			goto unlock;
+		}
 		/*
 		 * Shift range [to-end] to make room for one more element.
 		 */
@@ -320,23 +340,9 @@ int cec_add_elem(u64 pfn)
 
 		ret = 0;
 	} else {
-		u64 pfn = ca->array[to] >> PAGE_SHIFT;
-
-		if (!pfn_valid(pfn)) {
-			pr_warn("CEC: Invalid pfn: 0x%llx\n", pfn);
-		} else {
-			/* We have reached max count for this page, soft-offline it. */
-			pr_err("Soft-offlining pfn: 0x%llx\n", pfn);
-			memory_failure_queue(pfn, MF_SOFT_OFFLINE);
-			ca->pfns_poisoned++;
-		}
-
+		cec_valid_soft_offline(pfn);
 		del_elem(ca, to);
 
-		/*
-		 * Return a >0 value to denote that we've reached the offlining
-		 * threshold.
-		 */
 		ret = 1;
 
 		goto unlock;
-- 
2.21.0