linux-kernel - [PATCH 5/6] edac: Call the sysfs nodes as "rank" instead of "dimm" if chip select is used

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Date:	Wed,  7 Mar 2012 09:11:17 -0300
From:	Mauro Carvalho Chehab <mchehab@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 5/6] edac: Call the sysfs nodes as "rank" instead of "dimm" if chip select is used

The minimum hierarchy unit for csrows-based MC's is rank, and not dimm.

There are a few possible fixes here:

1) add a per-rank location at the dimm struct, and don't create one
   dimm_info entry per rank;

2) Convert the drivers to internally convert ranks into dimm's;

3) rename "dimm" with "rank";

A few drivers do (2) internally: some of them have per-dimm registers,
instead of per-rank ones; a few others have some routines to translate
between the two representations of the memory. Those drivers report the
memories via a DIMM slot and a channel.

While no better solution is done, let's do (2) for the drivers that work
with csrows/channel layers to represent a rank.

Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
---
 drivers/edac/edac_mc_sysfs.c |   20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 5b48528..dd934c2 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -567,10 +567,12 @@ static struct kobj_type ktype_dimm = {
 };
 /* Create a CSROW object under specifed edac_mc_device */
 static int edac_create_dimm_object(struct mem_ctl_info *mci,
-					struct dimm_info *dimm, int index)
+					struct dimm_info *dimm, int index,
+					bool is_rank)
 {
 	struct kobject *kobj_mci = &mci->edac_mci_kobj;
 	struct kobject *kobj;
+	const char *nodename;
 	int err;
 
 	/* generate ..../edac/mc/mc<id>/dimm<index>   */
@@ -585,8 +587,12 @@ static int edac_create_dimm_object(struct mem_ctl_info *mci,
 	}
 
 	/* Instanstiate the dimm object */
+	if (!is_rank)
+		nodename = "dimm%d";
+	else
+		nodename = "rank%d";
 	err = kobject_init_and_add(&dimm->kobj, &ktype_dimm, kobj_mci,
-				   "dimm%d", index);
+				nodename, index);
 	if (err)
 		goto err_release_top_kobj;
 
@@ -1338,6 +1344,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 	int err;
 	struct csrow_info *csrow;
 	struct kobject *kobj_mci = &mci->edac_mci_kobj;
+	bool is_rank = false;
 
 	debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
 
@@ -1386,6 +1393,13 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 		}
 	}
 
+	for (i = 0; i < mci->n_layers; i++) {
+		if (mci->layers[i].type == EDAC_MC_LAYER_CHIP_SELECT) {
+			is_rank = true;
+			break;
+		}
+	}
+
 	/*
 	 * Make directories for each DIMM object under the mc<id> kobject
 	 */
@@ -1406,7 +1420,7 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
 			printk(KERN_CONT "\n");
 		}
 #endif
-		err = edac_create_dimm_object(mci, dimm, j);
+		err = edac_create_dimm_object(mci, dimm, j, is_rank);
 		if (err) {
 			debugf1("%s() failure: create dimm %d obj\n",
 				__func__, j);
-- 
1.7.8

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