linux-kernel - [PATCH v3 3/8] EDAC/amd64: Initialize DIMM info for systems with more than two channels

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Date:   Wed, 21 Aug 2019 23:59:57 +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 v3 3/8] EDAC/amd64: Initialize DIMM info for systems with more
 than two channels

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

Currently, the DIMM info for AMD Family 17h systems is initialized in
init_csrows(). This function is shared with legacy systems, and it has a
limit of two channel support.

This prevents initialization of the DIMM info for a number of ranks, so
there will be missing ranks in the EDAC sysfs.

Create a new init_csrows_df() for Family17h+ and revert init_csrows()
back to pre-Family17h support.

Loop over all channels in the new function in order to support systems
with more than two channels.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lkml.kernel.org/r/20190709215643.171078-4-Yazen.Ghannam@amd.com

v2->v3:
* Drop Fixes: tag.
* Add x8 DRAM device case.

v1->v2:
* No change.

 drivers/edac/amd64_edac.c | 66 ++++++++++++++++++++++++++++++---------
 1 file changed, 52 insertions(+), 14 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 0e8b2137edbb..001dc85122e9 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -2837,6 +2837,49 @@ static u32 get_csrow_nr_pages(struct amd64_pvt *pvt, u8 dct, int csrow_nr_orig)
 	return nr_pages;
 }
 
+static int init_csrows_df(struct mem_ctl_info *mci)
+{
+	struct amd64_pvt *pvt = mci->pvt_info;
+	enum edac_type edac_mode = EDAC_NONE;
+	enum dev_type dev_type = DEV_UNKNOWN;
+	struct dimm_info *dimm;
+	int empty = 1;
+	u8 umc, cs;
+
+	if (mci->edac_ctl_cap & EDAC_FLAG_S16ECD16ED) {
+		edac_mode = EDAC_S16ECD16ED;
+		dev_type = DEV_X16;
+	} else if (mci->edac_ctl_cap & EDAC_FLAG_S8ECD8ED) {
+		edac_mode = EDAC_S8ECD8ED;
+		dev_type = DEV_X8;
+	} else if (mci->edac_ctl_cap & EDAC_FLAG_S4ECD4ED) {
+		edac_mode = EDAC_S4ECD4ED;
+		dev_type = DEV_X4;
+	} else if (mci->edac_ctl_cap & EDAC_FLAG_SECDED) {
+		edac_mode = EDAC_SECDED;
+	}
+
+	for_each_umc(umc) {
+		for_each_chip_select(cs, umc, pvt) {
+			if (!csrow_enabled(cs, umc, pvt))
+				continue;
+
+			empty = 0;
+			dimm = mci->csrows[cs]->channels[umc]->dimm;
+
+			edac_dbg(1, "MC node: %d, csrow: %d\n",
+					pvt->mc_node_id, cs);
+
+			dimm->nr_pages = get_csrow_nr_pages(pvt, umc, cs);
+			dimm->mtype = pvt->dram_type;
+			dimm->edac_mode = edac_mode;
+			dimm->dtype = dev_type;
+		}
+	}
+
+	return empty;
+}
+
 /*
  * Initialize the array of csrow attribute instances, based on the values
  * from pci config hardware registers.
@@ -2851,15 +2894,16 @@ static int init_csrows(struct mem_ctl_info *mci)
 	int nr_pages = 0;
 	u32 val;
 
-	if (!pvt->umc) {
-		amd64_read_pci_cfg(pvt->F3, NBCFG, &val);
+	if (pvt->umc)
+		return init_csrows_df(mci);
+
+	amd64_read_pci_cfg(pvt->F3, NBCFG, &val);
 
-		pvt->nbcfg = val;
+	pvt->nbcfg = val;
 
-		edac_dbg(0, "node %d, NBCFG=0x%08x[ChipKillEccCap: %d|DramEccEn: %d]\n",
-			 pvt->mc_node_id, val,
-			 !!(val & NBCFG_CHIPKILL), !!(val & NBCFG_ECC_ENABLE));
-	}
+	edac_dbg(0, "node %d, NBCFG=0x%08x[ChipKillEccCap: %d|DramEccEn: %d]\n",
+		 pvt->mc_node_id, val,
+		 !!(val & NBCFG_CHIPKILL), !!(val & NBCFG_ECC_ENABLE));
 
 	/*
 	 * We iterate over DCT0 here but we look at DCT1 in parallel, if needed.
@@ -2896,13 +2940,7 @@ static int init_csrows(struct mem_ctl_info *mci)
 		edac_dbg(1, "Total csrow%d pages: %u\n", i, nr_pages);
 
 		/* Determine DIMM ECC mode: */
-		if (pvt->umc) {
-			if (mci->edac_ctl_cap & EDAC_FLAG_S4ECD4ED)
-				edac_mode = EDAC_S4ECD4ED;
-			else if (mci->edac_ctl_cap & EDAC_FLAG_SECDED)
-				edac_mode = EDAC_SECDED;
-
-		} else if (pvt->nbcfg & NBCFG_ECC_ENABLE) {
+		if (pvt->nbcfg & NBCFG_ECC_ENABLE) {
 			edac_mode = (pvt->nbcfg & NBCFG_CHIPKILL)
 					? EDAC_S4ECD4ED
 					: EDAC_SECDED;
-- 
2.17.1