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From:   Robert Richter <rrichter@marvell.com>
To:     Borislav Petkov <bp@alien8.de>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Tony Luck <tony.luck@intel.com>
CC:     James Morse <james.morse@arm.com>,
        Aristeu Rozanski <aris@redhat.com>,
        Robert Richter <rrichter@marvell.com>,
        "linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH v3 10/10] EDAC/mc: Remove per layer counters
Thread-Topic: [PATCH v3 10/10] EDAC/mc: Remove per layer counters
Thread-Index: AQHV0cvu7j4bgx3XFUyxLBDaaQwKHw==
Date:   Thu, 23 Jan 2020 09:03:09 +0000
Message-ID: <20200123090210.26933-11-rrichter@marvell.com>
References: <20200123090210.26933-1-rrichter@marvell.com>
In-Reply-To: <20200123090210.26933-1-rrichter@marvell.com>
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Looking at how mci->{ue,ce}_per_layer[EDAC_MAX_LAYERS] is used, it
turns out that only the leaves in the memory hierarchy are consumed
(in sysfs), but not the intermediate layers, e.g.:

 count =3D dimm->mci->ce_per_layer[dimm->mci->n_layers-1][dimm->idx];

These unused counters only add complexity, remove them. The error
counter values are directly stored in struct dimm_info now.

Signed-off-by: Robert Richter <rrichter@marvell.com>
Acked-by: Aristeu Rozanski <aris@redhat.com>
---
 drivers/edac/edac_mc.c       | 65 +++++++++---------------------------
 drivers/edac/edac_mc_sysfs.c | 20 +++++------
 include/linux/edac.h         |  4 ++-
 3 files changed, 26 insertions(+), 63 deletions(-)

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 60639def8697..fbd9faa5c0f9 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -451,11 +451,9 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num=
,
 {
 	struct mem_ctl_info *mci;
 	struct edac_mc_layer *layer;
-	u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
-	unsigned int idx, size, tot_dimms =3D 1, count =3D 1;
-	unsigned int tot_csrows =3D 1, tot_channels =3D 1, tot_errcount =3D 0;
+	unsigned int idx, size, tot_dimms =3D 1;
+	unsigned int tot_csrows =3D 1, tot_channels =3D 1;
 	void *pvt, *ptr =3D NULL;
-	int i;
 	bool per_rank =3D false;
=20
 	if (WARN_ON(n_layers > EDAC_MAX_LAYERS || n_layers =3D=3D 0))
@@ -482,19 +480,10 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_nu=
m,
 	 * stringent as what the compiler would provide if we could simply
 	 * hardcode everything into a single struct.
 	 */
-	mci =3D edac_align_ptr(&ptr, sizeof(*mci), 1);
-	layer =3D edac_align_ptr(&ptr, sizeof(*layer), n_layers);
-	for (i =3D 0; i < n_layers; i++) {
-		count *=3D layers[i].size;
-		edac_dbg(4, "errcount layer %d size %d\n", i, count);
-		ce_per_layer[i] =3D edac_align_ptr(&ptr, sizeof(u32), count);
-		ue_per_layer[i] =3D edac_align_ptr(&ptr, sizeof(u32), count);
-		tot_errcount +=3D 2 * count;
-	}
-
-	edac_dbg(4, "allocating %d error counters\n", tot_errcount);
-	pvt =3D edac_align_ptr(&ptr, sz_pvt, 1);
-	size =3D ((unsigned long)pvt) + sz_pvt;
+	mci	=3D edac_align_ptr(&ptr, sizeof(*mci), 1);
+	layer	=3D edac_align_ptr(&ptr, sizeof(*layer), n_layers);
+	pvt	=3D edac_align_ptr(&ptr, sz_pvt, 1);
+	size	=3D ((unsigned long)pvt) + sz_pvt;
=20
 	edac_dbg(1, "allocating %u bytes for mci data (%d %s, %d csrows/channels)=
\n",
 		 size,
@@ -513,10 +502,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num=
,
 	 * rather than an imaginary chunk of memory located at address 0.
 	 */
 	layer =3D (struct edac_mc_layer *)(((char *)mci) + ((unsigned long)layer)=
);
-	for (i =3D 0; i < n_layers; i++) {
-		mci->ce_per_layer[i] =3D (u32 *)((char *)mci + ((unsigned long)ce_per_la=
yer[i]));
-		mci->ue_per_layer[i] =3D (u32 *)((char *)mci + ((unsigned long)ue_per_la=
yer[i]));
-	}
 	pvt =3D sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL;
=20
 	/* setup index and various internal pointers */
@@ -951,48 +936,28 @@ static void edac_inc_ce_error(struct edac_raw_error_d=
esc *e)
 {
 	struct mem_ctl_info *mci =3D error_desc_to_mci(e);
 	int pos[EDAC_MAX_LAYERS] =3D { e->top_layer, e->mid_layer, e->low_layer }=
;
-	int i, index =3D 0;
+	struct dimm_info *dimm =3D edac_get_dimm(mci, pos[0], pos[1], pos[2]);
=20
 	mci->ce_mc +=3D e->error_count;
=20
-	if (pos[0] < 0) {
+	if (dimm)
+		dimm->ce_count +=3D e->error_count;
+	else
 		mci->ce_noinfo_count +=3D e->error_count;
-		return;
-	}
-
-	for (i =3D 0; i < mci->n_layers; i++) {
-		if (pos[i] < 0)
-			break;
-		index +=3D pos[i];
-		mci->ce_per_layer[i][index] +=3D e->error_count;
-
-		if (i < mci->n_layers - 1)
-			index *=3D mci->layers[i + 1].size;
-	}
 }
=20
 static void edac_inc_ue_error(struct edac_raw_error_desc *e)
 {
 	struct mem_ctl_info *mci =3D error_desc_to_mci(e);
 	int pos[EDAC_MAX_LAYERS] =3D { e->top_layer, e->mid_layer, e->low_layer }=
;
-	int i, index =3D 0;
+	struct dimm_info *dimm =3D edac_get_dimm(mci, pos[0], pos[1], pos[2]);
=20
 	mci->ue_mc +=3D e->error_count;
=20
-	if (pos[0] < 0) {
+	if (dimm)
+		dimm->ue_count +=3D e->error_count;
+	else
 		mci->ue_noinfo_count +=3D e->error_count;
-		return;
-	}
-
-	for (i =3D 0; i < mci->n_layers; i++) {
-		if (pos[i] < 0)
-			break;
-		index +=3D pos[i];
-		mci->ue_per_layer[i][index] +=3D e->error_count;
-
-		if (i < mci->n_layers - 1)
-			index *=3D mci->layers[i + 1].size;
-	}
 }
=20
 static void edac_ce_error(struct edac_raw_error_desc *e)
@@ -1139,7 +1104,7 @@ void edac_mc_handle_error(const enum hw_event_mc_err_=
type type,
 	/*
 	 * Check if the event report is consistent and if the memory
 	 * location is known. If it is known, the DIMM(s) label info
-	 * will be filled and the per-layer error counters will be
+	 * will be filled and the DIMM's error counters will be
 	 * incremented.
 	 */
 	for (i =3D 0; i < mci->n_layers; i++) {
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 408bace699dc..20657530a108 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -551,10 +551,8 @@ static ssize_t dimmdev_ce_count_show(struct device *de=
v,
 				      char *data)
 {
 	struct dimm_info *dimm =3D to_dimm(dev);
-	u32 count;
=20
-	count =3D dimm->mci->ce_per_layer[dimm->mci->n_layers-1][dimm->idx];
-	return sprintf(data, "%u\n", count);
+	return sprintf(data, "%u\n", dimm->ce_count);
 }
=20
 static ssize_t dimmdev_ue_count_show(struct device *dev,
@@ -562,10 +560,8 @@ static ssize_t dimmdev_ue_count_show(struct device *de=
v,
 				      char *data)
 {
 	struct dimm_info *dimm =3D to_dimm(dev);
-	u32 count;
=20
-	count =3D dimm->mci->ue_per_layer[dimm->mci->n_layers-1][dimm->idx];
-	return sprintf(data, "%u\n", count);
+	return sprintf(data, "%u\n", dimm->ue_count);
 }
=20
 /* dimm/rank attribute files */
@@ -661,7 +657,9 @@ static ssize_t mci_reset_counters_store(struct device *=
dev,
 					const char *data, size_t count)
 {
 	struct mem_ctl_info *mci =3D to_mci(dev);
-	int cnt, row, chan, i;
+	struct dimm_info *dimm;
+	int row, chan;
+
 	mci->ue_mc =3D 0;
 	mci->ce_mc =3D 0;
 	mci->ue_noinfo_count =3D 0;
@@ -677,11 +675,9 @@ static ssize_t mci_reset_counters_store(struct device =
*dev,
 			ri->channels[chan]->ce_count =3D 0;
 	}
=20
-	cnt =3D 1;
-	for (i =3D 0; i < mci->n_layers; i++) {
-		cnt *=3D mci->layers[i].size;
-		memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
-		memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
+	mci_for_each_dimm(mci, dimm) {
+		dimm->ue_count =3D 0;
+		dimm->ce_count =3D 0;
 	}
=20
 	mci->start_time =3D jiffies;
diff --git a/include/linux/edac.h b/include/linux/edac.h
index 815f246e0abd..0f20b986b0ab 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -383,6 +383,9 @@ struct dimm_info {
 	unsigned int csrow, cschannel;	/* Points to the old API data */
=20
 	u16 smbios_handle;              /* Handle for SMBIOS type 17 */
+
+	u32 ce_count;
+	u32 ue_count;
 };
=20
 /**
@@ -559,7 +562,6 @@ struct mem_ctl_info {
 	 */
 	u32 ce_noinfo_count, ue_noinfo_count;
 	u32 ue_mc, ce_mc;
-	u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
=20
 	struct completion complete;
=20
--=20
2.20.1