linux-kernel - [PATCH 3/5] EDAC/amd64: Recognize x16 Symbol Size

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Date:   Tue, 19 Feb 2019 20:25:54 +0000
From:   "Ghannam, Yazen" <Yazen.Ghannam@....com>
To:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
CC:     "Ghannam, Yazen" <Yazen.Ghannam@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bp@...en8.de" <bp@...en8.de>
Subject: [PATCH 3/5] EDAC/amd64: Recognize x16 Symbol Size

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

Future AMD systems may support x16 symbol sizes.

Recognize if a system is using x16 symbol size. Also, simplify the print
statement.

Note that a x16 syndrome vector table is not necessary like with x4 or
x8. This is because systems that support x16 symbol sizes will be SMCA
systems. In which case, the syndrome can be directly extracted from the
MCA_SYND[Syndrome] field.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 drivers/edac/amd64_edac.c | 15 +++++++++------
 drivers/edac/amd64_edac.h |  2 +-
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 507d824fe45a..bacd2cb22f29 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -897,8 +897,7 @@ static void dump_misc_regs(struct amd64_pvt *pvt)
 
 	edac_dbg(1, "  DramHoleValid: %s\n", dhar_valid(pvt) ? "yes" : "no");
 
-	amd64_info("using %s syndromes.\n",
-			((pvt->ecc_sym_sz == 8) ? "x8" : "x4"));
+	amd64_info("using x%u syndromes.\n", pvt->ecc_sym_sz);
 }
 
 /*
@@ -2609,10 +2608,14 @@ static void determine_ecc_sym_sz(struct amd64_pvt *pvt)
 
 		for_each_umc(i) {
 			/* Check enabled channels only: */
-			if ((pvt->umc[i].sdp_ctrl & UMC_SDP_INIT) &&
-			    (pvt->umc[i].ecc_ctrl & BIT(7))) {
-				pvt->ecc_sym_sz = 8;
-				break;
+			if (pvt->umc[i].sdp_ctrl & UMC_SDP_INIT) {
+				if (pvt->umc[i].ecc_ctrl & BIT(9)) {
+					pvt->ecc_sym_sz = 16;
+					break;
+				} else if (pvt->umc[i].ecc_ctrl & BIT(7)) {
+					pvt->ecc_sym_sz = 8;
+					break;
+				}
 			}
 		}
 
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 435450bf8684..6c6ce783208a 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -364,7 +364,7 @@ struct amd64_pvt {
 	u32 dct_sel_hi;		/* DRAM Controller Select High */
 	u32 online_spare;	/* On-Line spare Reg */
 
-	/* x4 or x8 syndromes in use */
+	/* x4, x8, or x16 syndromes in use */
 	u8 ecc_sym_sz;
 
 	/* place to store error injection parameters prior to issue */
-- 
2.17.1