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Date: Sun, 16 Dec 2012 02:15:30 +0530
From: Arvind R <arvino55@...il.com>
To: linux-edac@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
linux-next@...r.kernel.org
Subject: [PATCH 3.7.0 8/9] i82975x_edac: fix wrong offset reported
Subject: [PATCH 3.7.0 8/9] i82975x_edac: fix wrong offset reported
Cleanup error reporting function. This also corrects the wrong
calculation of the offset mask.
Signed-off-by: Arvind R. <arvino55@...il.com>
---
i82975x_edac.c | 59 +++++++++++++++++-------------------------
1 file changed, 25 insertions(+), 34 deletions(-)
--- a/drivers/edac/i82975x_edac.c 2012-12-15 23:55:02.000000000 +0530
+++ b/drivers/edac/i82975x_edac.c 2012-12-15 23:54:00.000000000 +0530
@@ -34,6 +34,8 @@
#define I82975X_NR_CSROWS_PER_CHANNEL 4
#define I82975X_NR_CSROWS_PER_DIMM 2
+#define I82975X_ECC_GRAIN (1 << 7)
+
/* Intel 82975X register addresses - device 0 function 0 - DRAM Controller */
#define I82975X_EAP 0x58 /* Dram Error Address Pointer (32b)
*
@@ -205,6 +207,10 @@ NOTE: Only ONE of the three must be enab
#define I82975X_DRC_CH0M1 0x124
#define I82975X_DRC_CH1M1 0x1A4
+#define I82975X_BIT_ERROR_CE 0x01
+#define I82975X_BIT_ERROR_UE 0x02
+#define I82975X_BITS_ERROR 0x03
+
enum i82975x_chips {
I82975X_chip = 0,
};
@@ -239,7 +245,7 @@ static struct pci_dev *mci_pdev; /* init
static int i82975x_registered = 1;
-static void i82975x_get_error_info(struct mem_ctl_info *mci,
+static bool i82975x_get_error_info(struct mem_ctl_info *mci,
struct i82975x_error_info *info)
{
struct pci_dev *pdev;
@@ -258,7 +264,8 @@ static void i82975x_get_error_info(struc
pci_read_config_byte(pdev, I82975X_DERRSYN, &info->derrsyn);
pci_read_config_word(pdev, I82975X_ERRSTS, &info->errsts2);
- pci_write_bits16(pdev, I82975X_ERRSTS, 0x0003, 0x0003);
+ pci_write_bits16(pdev, I82975X_ERRSTS, I82975X_BITS_ERROR,
+ I82975X_BITS_ERROR);
/*
* If the error is the same then we can for both reads then
@@ -266,31 +273,30 @@ static void i82975x_get_error_info(struc
* there is a CE no info and the second set of reads is valid
* and should be UE info.
*/
- if (!(info->errsts2 & 0x0003))
- return;
+ if (!(info->errsts2 & I82975X_BITS_ERROR))
+ return false;
- if ((info->errsts ^ info->errsts2) & 0x0003) {
+ if ((info->errsts ^ info->errsts2) & I82975X_BITS_ERROR) {
pci_read_config_dword(pdev, I82975X_EAP, &info->eap);
pci_read_config_byte(pdev, I82975X_XEAP, &info->xeap);
pci_read_config_byte(pdev, I82975X_DES, &info->des);
pci_read_config_byte(pdev, I82975X_DERRSYN,
&info->derrsyn);
}
+ return true;
}
static int i82975x_process_error_info(struct mem_ctl_info *mci,
struct i82975x_error_info *info, int handle_errors)
{
+ enum hw_event_mc_err_type err_type;
int row, chan;
unsigned long offst, page;
- if (!(info->errsts2 & 0x0003))
- return 0;
-
if (!handle_errors)
return 1;
- if ((info->errsts ^ info->errsts2) & 0x0003) {
+ if ((info->errsts ^ info->errsts2) & I82975X_BITS_ERROR) {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
-1, -1, -1, "UE overwrote CE", "");
info->errsts = info->errsts2;
@@ -302,30 +308,15 @@ static int i82975x_process_error_info(st
page |= 0x80000000;
page >>= (PAGE_SHIFT - 1);
row = edac_mc_find_csrow_by_page(mci, page);
+ chan = (mci->num_cschannel == 1) ? 0 : info->eap & 1;
+ offst = info->eap & ((1 << PAGE_SHIFT) - I82975X_ECC_GRAIN);
- if (row == -1) {
- i82975x_mc_printk(mci, KERN_ERR, "error processing EAP:\n"
- "\tXEAP=%u\n"
- "\t EAP=0x%08x\n"
- "\tPAGE=0x%08x\n",
- (info->xeap & 1) ? 1 : 0, info->eap, (unsigned) page);
- return 0;
- }
- chan = (mci->csrows[row]->nr_channels == 1) ? 0 : info->eap & 1;
- offst = info->eap
- & ((1 << PAGE_SHIFT) -
- (1 << mci->csrows[row]->channels[chan]->dimm->grain));
-
- if (info->errsts & 0x0002)
- edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
- page, offst, 0,
- row, -1, -1,
- "i82975x UE", "");
- else
- edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
+ err_type = (info->errsts & I82975X_BIT_ERROR_UE) ?
+ HW_EVENT_ERR_UNCORRECTED : HW_EVENT_ERR_CORRECTED;
+ edac_mc_handle_error(err_type, mci, 1,
page, offst, info->derrsyn,
- row, chan ? chan : 0, -1,
- "i82975x CE", "");
+ row, chan, -1,
+ "i82975x", "");
return 1;
}
@@ -335,8 +326,8 @@ static void i82975x_check(struct mem_ctl
struct i82975x_error_info info;
edac_dbg(4, "MC%d\n", mci->mc_idx);
- i82975x_get_error_info(mci, &info);
- i82975x_process_error_info(mci, &info, 1);
+ if (i82975x_get_error_info(mci, &info))
+ i82975x_process_error_info(mci, &info, 1);
}
static void i82975x_init_csrows(struct mem_ctl_info *mci,
@@ -398,7 +389,7 @@ static void i82975x_init_csrows(struct m
chan) + 'A',
((index % I82975X_NR_CSROWS_PER_CHANNEL) /
I82975X_NR_CSROWS_PER_DIMM) + 1);
- dimm->grain = 1 << 7; /* always */
+ dimm->grain = I82975X_ECC_GRAIN; /* always */
dimm->dtype = DEV_X8; /* only with ECC */
dimm->mtype = MEM_DDR2; /* only supported */
dimm->edac_mode = EDAC_SECDED; /* only supported */
--
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