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Message-ID: <20191106093239.25517-3-rrichter@marvell.com>
Date: Wed, 6 Nov 2019 09:33:04 +0000
From: Robert Richter <rrichter@...vell.com>
To: Borislav Petkov <bp@...en8.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Tony Luck <tony.luck@...el.com>
CC: James Morse <james.morse@....com>,
Robert Richter <rrichter@...vell.com>,
"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 02/20] EDAC: Remove EDAC_DIMM_OFF() macro
The EDAC_DIMM_OFF() macro takes 5 arguments to get the DIMM's index.
This can be much simplified. Store the index in struct dimm_info to
avoid its calculation and remove the EDAC_DIMM_OFF() macro. The index
can be directly used.
Another advantage is that edac_mc_alloc() could be used even if the
exact size of the layers is unknown. Only the number of DIMMs would be
needed.
Signed-off-by: Robert Richter <rrichter@...vell.com>
---
drivers/edac/edac_mc.c | 14 ++++-------
drivers/edac/edac_mc_sysfs.c | 20 ++++------------
include/linux/edac.h | 45 ++++--------------------------------
3 files changed, 13 insertions(+), 66 deletions(-)
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index e6fd079783bd..72088d49b03b 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -314,10 +314,10 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
struct dimm_info *dimm;
u32 *ce_per_layer[EDAC_MAX_LAYERS], *ue_per_layer[EDAC_MAX_LAYERS];
unsigned int pos[EDAC_MAX_LAYERS];
- unsigned int size, tot_dimms = 1, count = 1;
+ unsigned int idx, size, tot_dimms = 1, count = 1;
unsigned int tot_csrows = 1, tot_channels = 1, tot_errcount = 0;
void *pvt, *p, *ptr = NULL;
- int i, j, row, chn, n, len, off;
+ int i, j, row, chn, n, len;
bool per_rank = false;
BUG_ON(n_layers > EDAC_MAX_LAYERS || n_layers == 0);
@@ -425,19 +425,15 @@ struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
memset(&pos, 0, sizeof(pos));
row = 0;
chn = 0;
- for (i = 0; i < tot_dimms; i++) {
+ for (idx = 0; idx < tot_dimms; idx++) {
chan = mci->csrows[row]->channels[chn];
- off = EDAC_DIMM_OFF(layer, n_layers, pos[0], pos[1], pos[2]);
- if (off < 0 || off >= tot_dimms) {
- edac_mc_printk(mci, KERN_ERR, "EDAC core bug: EDAC_DIMM_OFF is trying to do an illegal data access\n");
- goto error;
- }
dimm = kzalloc(sizeof(**mci->dimms), GFP_KERNEL);
if (!dimm)
goto error;
- mci->dimms[off] = dimm;
+ mci->dimms[idx] = dimm;
dimm->mci = mci;
+ dimm->idx = idx;
/*
* Copy DIMM location and initialize it.
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 32d016f1ecd1..91e4c8f155af 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -557,14 +557,8 @@ static ssize_t dimmdev_ce_count_show(struct device *dev,
{
struct dimm_info *dimm = to_dimm(dev);
u32 count;
- int off;
-
- off = EDAC_DIMM_OFF(dimm->mci->layers,
- dimm->mci->n_layers,
- dimm->location[0],
- dimm->location[1],
- dimm->location[2]);
- count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][off];
+
+ count = dimm->mci->ce_per_layer[dimm->mci->n_layers-1][dimm->idx];
return sprintf(data, "%u\n", count);
}
@@ -574,14 +568,8 @@ static ssize_t dimmdev_ue_count_show(struct device *dev,
{
struct dimm_info *dimm = to_dimm(dev);
u32 count;
- int off;
-
- off = EDAC_DIMM_OFF(dimm->mci->layers,
- dimm->mci->n_layers,
- dimm->location[0],
- dimm->location[1],
- dimm->location[2]);
- count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][off];
+
+ count = dimm->mci->ue_per_layer[dimm->mci->n_layers-1][dimm->idx];
return sprintf(data, "%u\n", count);
}
diff --git a/include/linux/edac.h b/include/linux/edac.h
index 696bfb684d92..79c5564ee314 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -362,47 +362,6 @@ struct edac_mc_layer {
*/
#define EDAC_MAX_LAYERS 3
-/**
- * EDAC_DIMM_OFF - Macro responsible to get a pointer offset inside a pointer
- * array for the element given by [layer0,layer1,layer2]
- * position
- *
- * @layers: a struct edac_mc_layer array, describing how many elements
- * were allocated for each layer
- * @nlayers: Number of layers at the @layers array
- * @layer0: layer0 position
- * @layer1: layer1 position. Unused if n_layers < 2
- * @layer2: layer2 position. Unused if n_layers < 3
- *
- * For 1 layer, this macro returns "var[layer0] - var";
- *
- * For 2 layers, this macro is similar to allocate a bi-dimensional array
- * and to return "var[layer0][layer1] - var";
- *
- * For 3 layers, this macro is similar to allocate a tri-dimensional array
- * and to return "var[layer0][layer1][layer2] - var".
- *
- * A loop could be used here to make it more generic, but, as we only have
- * 3 layers, this is a little faster.
- *
- * By design, layers can never be 0 or more than 3. If that ever happens,
- * a NULL is returned, causing an OOPS during the memory allocation routine,
- * with would point to the developer that he's doing something wrong.
- */
-#define EDAC_DIMM_OFF(layers, nlayers, layer0, layer1, layer2) ({ \
- int __i; \
- if ((nlayers) == 1) \
- __i = layer0; \
- else if ((nlayers) == 2) \
- __i = (layer1) + ((layers[1]).size * (layer0)); \
- else if ((nlayers) == 3) \
- __i = (layer2) + ((layers[2]).size * ((layer1) + \
- ((layers[1]).size * (layer0)))); \
- else \
- __i = -EINVAL; \
- __i; \
-})
-
struct dimm_info {
struct device dev;
@@ -412,6 +371,7 @@ struct dimm_info {
unsigned int location[EDAC_MAX_LAYERS];
struct mem_ctl_info *mci; /* the parent */
+ unsigned int idx; /* index within the parent dimm array */
u32 grain; /* granularity of reported error in bytes */
enum dev_type dtype; /* memory device type */
@@ -654,6 +614,9 @@ edac_get_dimm_by_index(struct mem_ctl_info *mci, int index)
if (index < 0 || index >= mci->tot_dimms)
return NULL;
+ if (WARN_ON_ONCE(mci->dimms[index]->idx != index))
+ return NULL;
+
return mci->dimms[index];
}
--
2.20.1
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