EDAC: Fixup scrubrate manipulation
Make the ->{get|set}_sdram_scrub_rate return the actual scrub rate
bandwidth it succeeded setting and remove superfluous arg pointer used
for that. A negative value returned still means that an error occurred
while setting the scrubrate. Document this for future reference.
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index dce61f7..39d97cf 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -436,56 +436,55 @@
return count;
}
-/* memory scrubbing */
+/* Memory scrubbing interface:
+ *
+ * A MC driver can limit the scrubbing bandwidth based on the CPU type.
+ * Therefore, ->set_sdram_scrub_rate should be made to return the actual
+ * bandwidth that is accepted or 0 when scrubbing is to be disabled.
+ *
+ * Negative value still means that an error has occurred while setting
+ * the scrub rate.
+ */
static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci,
const char *data, size_t count)
{
unsigned long bandwidth = 0;
- int err;
+ int new_bw = 0;
- if (!mci->set_sdram_scrub_rate) {
- edac_printk(KERN_WARNING, EDAC_MC,
- "Memory scrub rate setting not implemented!\n");
+ if (!mci->set_sdram_scrub_rate)
return -EINVAL;
- }
if (strict_strtoul(data, 10, &bandwidth) < 0)
return -EINVAL;
- err = mci->set_sdram_scrub_rate(mci, (u32)bandwidth);
- if (err) {
- edac_printk(KERN_DEBUG, EDAC_MC,
- "Failed setting scrub rate to %lu\n", bandwidth);
- return -EINVAL;
- }
- else {
- edac_printk(KERN_DEBUG, EDAC_MC,
- "Scrub rate set to: %lu\n", bandwidth);
+ new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
+ if (new_bw >= 0) {
+ edac_printk(KERN_DEBUG, EDAC_MC, "Scrub rate set to %d\n", new_bw);
return count;
}
+
+ edac_printk(KERN_DEBUG, EDAC_MC, "Error setting scrub rate to: %lu\n", bandwidth);
+ return -EINVAL;
}
+/*
+ * ->get_sdram_scrub_rate() return value semantics same as above.
+ */
static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data)
{
- u32 bandwidth = 0;
- int err;
+ int bandwidth = 0;
- if (!mci->get_sdram_scrub_rate) {
- edac_printk(KERN_WARNING, EDAC_MC,
- "Memory scrub rate reading not implemented\n");
+ if (!mci->get_sdram_scrub_rate)
return -EINVAL;
+
+ bandwidth = mci->get_sdram_scrub_rate(mci);
+ if (bandwidth < 0) {
+ edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
+ return bandwidth;
}
- err = mci->get_sdram_scrub_rate(mci, &bandwidth);
- if (err) {
- edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
- return err;
- }
- else {
- edac_printk(KERN_DEBUG, EDAC_MC,
- "Read scrub rate: %d\n", bandwidth);
- return sprintf(data, "%d\n", bandwidth);
- }
+ edac_printk(KERN_DEBUG, EDAC_MC, "Read scrub rate: %d\n", bandwidth);
+ return sprintf(data, "%d\n", bandwidth);
}
/* default attribute files for the MCI object */