3 files changed, 82 insertions, 1 deletions

diff --git a/Documentation/drivers/edac/edac.txt b/Documentation/drivers/edac/edac.txt
index 7b3d969d296..3c5a9e4297b 100644
--- a/Documentation/drivers/edac/edac.txt
+++ b/Documentation/drivers/edac/edac.txt
@@ -339,7 +339,21 @@ Device Symlink:
 
 	'device'
 
-	Symlink to the memory controller device
+	Symlink to the memory controller device.
+
+Sdram memory scrubbing rate:
+
+	'sdram_scrub_rate'
+
+	Read/Write attribute file that controls memory scrubbing. The scrubbing
+	rate is set by writing a minimum bandwith in bytes/sec to the attribute
+	file. The rate will be translated to an internal value that gives at
+	least the specified rate.
+
+	Reading the file will return the actual scrubbing rate employed.
+
+	If configuration fails or memory scrubbing is not implemented, the value
+	of the attribute file will be -1.
 
 
 
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index 1b4fc922180..1df8c0c5d40 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -927,6 +927,57 @@ static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 	return count;
 }
 
+/* memory scrubbing */
+static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
+					const char *data, size_t count)
+{
+	u32 bandwidth = -1;
+
+	if (mci->set_sdram_scrub_rate) {
+
+		memctrl_int_store(&bandwidth, data, count);
+
+		if (!(*mci->set_sdram_scrub_rate)(mci, &bandwidth)) {
+			edac_printk(KERN_DEBUG, EDAC_MC,
+				"Scrub rate set successfully, applied: %d\n",
+				bandwidth);
+		} else {
+			/* FIXME: error codes maybe? */
+			edac_printk(KERN_DEBUG, EDAC_MC,
+				"Scrub rate set FAILED, could not apply: %d\n",
+				bandwidth);
+		}
+	} else {
+		/* FIXME: produce "not implemented" ERROR for user-side. */
+		edac_printk(KERN_WARNING, EDAC_MC,
+			"Memory scrubbing 'set'control is not implemented!\n");
+	}
+	return count;
+}
+
+static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
+{
+	u32 bandwidth = -1;
+
+	if (mci->get_sdram_scrub_rate) {
+		if (!(*mci->get_sdram_scrub_rate)(mci, &bandwidth)) {
+			edac_printk(KERN_DEBUG, EDAC_MC,
+				"Scrub rate successfully, fetched: %d\n",
+				bandwidth);
+		} else {
+			/* FIXME: error codes maybe? */
+			edac_printk(KERN_DEBUG, EDAC_MC,
+				"Scrub rate fetch FAILED, got: %d\n",
+				bandwidth);
+		}
+	} else {
+		/* FIXME: produce "not implemented" ERROR for user-side.  */
+		edac_printk(KERN_WARNING, EDAC_MC,
+			"Memory scrubbing 'get' control is not implemented!\n");
+	}
+	return sprintf(data, "%d\n", bandwidth);
+}
+
 /* default attribute files for the MCI object */
 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 {
@@ -1033,6 +1084,9 @@ MCIDEV_ATTR(ce_noinfo_count,S_IRUGO,mci_ce_noinfo_show,NULL);
 MCIDEV_ATTR(ue_count,S_IRUGO,mci_ue_count_show,NULL);
 MCIDEV_ATTR(ce_count,S_IRUGO,mci_ce_count_show,NULL);
 
+/* memory scrubber attribute file */
+MCIDEV_ATTR(sdram_scrub_rate,S_IRUGO|S_IWUSR,mci_sdram_scrub_rate_show,mci_sdram_scrub_rate_store);
+
 static struct mcidev_attribute *mci_attr[] = {
 	&mci_attr_reset_counters,
 	&mci_attr_mc_name,
@@ -1042,6 +1096,7 @@ static struct mcidev_attribute *mci_attr[] = {
 	&mci_attr_ce_noinfo_count,
 	&mci_attr_ue_count,
 	&mci_attr_ce_count,
+	&mci_attr_sdram_scrub_rate,
 	NULL
 };
 
diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index a1cfd4e3c97..c41986a9ed5 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -315,6 +315,18 @@ struct mem_ctl_info {
 	unsigned long scrub_cap;	/* chipset scrub capabilities */
 	enum scrub_type scrub_mode;	/* current scrub mode */
 
+	/* Translates sdram memory scrub rate given in bytes/sec to the
+	   internal representation and configures whatever else needs
+	   to be configured.
+	*/
+	int (*set_sdram_scrub_rate) (struct mem_ctl_info *mci, u32 *bw);
+
+	/* Get the current sdram memory scrub rate from the internal
+	   representation and converts it to the closest matching
+	   bandwith in bytes/sec.
+	*/
+	int (*get_sdram_scrub_rate) (struct mem_ctl_info *mci, u32 *bw);
+
 	/* pointer to edac checking routine */
 	void (*edac_check) (struct mem_ctl_info * mci);
 	/*