Commit 39094443 authored by Borislav Petkov's avatar Borislav Petkov

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: default avatarBorislav Petkov <borislav.petkov@amd.com>
parent 360b7f3c
......@@ -77,7 +77,11 @@ static int ddr3_dbam[] = { [0] = -1,
*FIXME: Produce a better mapping/linearisation.
*/
struct scrubrate scrubrates[] = {
struct scrubrate {
u32 scrubval; /* bit pattern for scrub rate */
u32 bandwidth; /* bandwidth consumed (bytes/sec) */
} scrubrates[] = {
{ 0x01, 1600000000UL},
{ 0x02, 800000000UL},
{ 0x03, 400000000UL},
......@@ -151,14 +155,12 @@ static int __amd64_set_scrub_rate(struct pci_dev *ctl, u32 new_bw, u32 min_rate)
}
scrubval = scrubrates[i].scrubval;
if (scrubval)
amd64_info("Setting scrub rate bandwidth: %u\n",
scrubrates[i].bandwidth);
else
amd64_info("Turning scrubbing off.\n");
pci_write_bits32(ctl, K8_SCRCTRL, scrubval, 0x001F);
if (scrubval)
return scrubrates[i].bandwidth;
return 0;
}
......@@ -169,11 +171,11 @@ static int amd64_set_scrub_rate(struct mem_ctl_info *mci, u32 bw)
return __amd64_set_scrub_rate(pvt->F3, bw, pvt->min_scrubrate);
}
static int amd64_get_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
static int amd64_get_scrub_rate(struct mem_ctl_info *mci)
{
struct amd64_pvt *pvt = mci->pvt_info;
u32 scrubval = 0;
int status = -1, i;
int i, retval = -EINVAL;
amd64_read_pci_cfg(pvt->F3, K8_SCRCTRL, &scrubval);
......@@ -183,13 +185,11 @@ static int amd64_get_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
for (i = 0; i < ARRAY_SIZE(scrubrates); i++) {
if (scrubrates[i].scrubval == scrubval) {
*bw = scrubrates[i].bandwidth;
status = 0;
retval = scrubrates[i].bandwidth;
break;
}
}
return status;
return retval;
}
/* Map from a CSROW entry to the mask entry that operates on it */
......
......@@ -482,12 +482,6 @@ struct ecc_settings {
} flags;
};
struct scrubrate {
u32 scrubval; /* bit pattern for scrub rate */
u32 bandwidth; /* bandwidth consumed (bytes/sec) */
};
extern struct scrubrate scrubrates[23];
extern const char *tt_msgs[4];
extern const char *ll_msgs[4];
extern const char *rrrr_msgs[16];
......
......@@ -818,9 +818,10 @@ static void cpc925_del_edac_devices(void)
}
/* Convert current back-ground scrub rate into byte/sec bandwith */
static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci)
{
struct cpc925_mc_pdata *pdata = mci->pvt_info;
int bw;
u32 mscr;
u8 si;
......@@ -832,11 +833,11 @@ static int cpc925_get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
if (((mscr & MSCR_SCRUB_MOD_MASK) != MSCR_BACKGR_SCRUB) ||
(si == 0)) {
cpc925_mc_printk(mci, KERN_INFO, "Scrub mode not enabled\n");
*bw = 0;
bw = 0;
} else
*bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
bw = CPC925_SCRUB_BLOCK_SIZE * 0xFA67 / si;
return 0;
return bw;
}
/* Return 0 for single channel; 1 for dual channel */
......
......@@ -983,11 +983,11 @@ static int set_sdram_scrub_rate(struct mem_ctl_info *mci, u32 new_bw)
pci_write_config_word(pdev, E752X_MCHSCRB, scrubrates[i].scrubval);
return 0;
return scrubrates[i].bandwidth;
}
/* Convert current scrub rate value into byte/sec bandwidth */
static int get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
static int get_sdram_scrub_rate(struct mem_ctl_info *mci)
{
const struct scrubrate *scrubrates;
struct e752x_pvt *pvt = (struct e752x_pvt *) mci->pvt_info;
......@@ -1013,10 +1013,8 @@ static int get_sdram_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
"Invalid sdram scrub control value: 0x%x\n", scrubval);
return -1;
}
return scrubrates[i].bandwidth;
*bw = scrubrates[i].bandwidth;
return 0;
}
/* Return 1 if dual channel mode is active. Else return 0. */
......
......@@ -387,7 +387,7 @@ struct mem_ctl_info {
representation and converts it to the closest matching
bandwith in bytes/sec.
*/
int (*get_sdram_scrub_rate) (struct mem_ctl_info * mci, u32 * bw);
int (*get_sdram_scrub_rate) (struct mem_ctl_info * mci);
/* pointer to edac checking routine */
......
......@@ -436,56 +436,55 @@ static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
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;
}
err = mci->get_sdram_scrub_rate(mci, &bandwidth);
if (err) {
bandwidth = mci->get_sdram_scrub_rate(mci);
if (bandwidth < 0) {
edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n");
return err;
return bandwidth;
}
else {
edac_printk(KERN_DEBUG, EDAC_MC,
"Read scrub rate: %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 */
......
......@@ -611,20 +611,17 @@ static int i5100_set_scrub_rate(struct mem_ctl_info *mci, u32 bandwidth)
bandwidth = 5900000 * i5100_mc_scrben(dw);
return 0;
return bandwidth;
}
static int i5100_get_scrub_rate(struct mem_ctl_info *mci,
u32 *bandwidth)
static int i5100_get_scrub_rate(struct mem_ctl_info *mci)
{
struct i5100_priv *priv = mci->pvt_info;
u32 dw;
pci_read_config_dword(priv->mc, I5100_MC, &dw);
*bandwidth = 5900000 * i5100_mc_scrben(dw);
return 0;
return 5900000 * i5100_mc_scrben(dw);
}
static struct pci_dev *pci_get_device_func(unsigned vendor,
......
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