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Message-ID: <1258381008-18783-7-git-send-email-borislav.petkov@amd.com>
Date: Mon, 16 Nov 2009 15:16:33 +0100
From: Borislav Petkov <borislav.petkov@....com>
To: <linux-kernel@...r.kernel.org>
CC: <x86@...nel.org>, <norsk5@...oo.com>
Subject: [PATCH 06/21] amd64_edac: wrap-up pci config read error handling
Add a pci config read wrapper for signaling pci config space access
errors instead of them being visible only on a debug build. This is
important on amd64_edac since it uses all those pci config register
values to access the DRAM/DIMM configuration of the nodes.
In addition, the wrapper makes a _lot_ (look at the diffstat!) of
error handling code superfluous and improves much of the overall code
readability by removing error handling details out of the way.
Signed-off-by: Borislav Petkov <borislav.petkov@....com>
---
drivers/edac/amd64_edac.c | 213 ++++++++++++---------------------------------
drivers/edac/amd64_edac.h | 16 ++++
2 files changed, 70 insertions(+), 159 deletions(-)
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 70c7d5f..3e5ece6 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -164,11 +164,9 @@ static int amd64_get_scrub_rate(struct mem_ctl_info *mci, u32 *bw)
{
struct amd64_pvt *pvt = mci->pvt_info;
u32 scrubval = 0;
- int status = -1, i, ret = 0;
+ int status = -1, i;
- ret = pci_read_config_dword(pvt->misc_f3_ctl, K8_SCRCTRL, &scrubval);
- if (ret)
- debugf0("Reading K8_SCRCTRL failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_SCRCTRL, &scrubval);
scrubval = scrubval & 0x001F;
@@ -909,26 +907,10 @@ static void amd64_dump_misc_regs(struct amd64_pvt *pvt)
/* Read in both of DBAM registers */
static void amd64_read_dbam_reg(struct amd64_pvt *pvt)
{
- int err = 0;
- unsigned int reg;
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, DBAM0, &pvt->dbam0);
- reg = DBAM0;
- err = pci_read_config_dword(pvt->dram_f2_ctl, reg, &pvt->dbam0);
- if (err)
- goto err_reg;
-
- if (boot_cpu_data.x86 >= 0x10) {
- reg = DBAM1;
- err = pci_read_config_dword(pvt->dram_f2_ctl, reg, &pvt->dbam1);
-
- if (err)
- goto err_reg;
- }
-
- return;
-
-err_reg:
- debugf0("Error reading F2x%03x.\n", reg);
+ if (boot_cpu_data.x86 >= 0x10)
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, DBAM1, &pvt->dbam1);
}
/*
@@ -991,28 +973,21 @@ static void amd64_set_dct_base_and_mask(struct amd64_pvt *pvt)
*/
static void amd64_read_dct_base_mask(struct amd64_pvt *pvt)
{
- int cs, reg, err = 0;
+ int cs, reg;
amd64_set_dct_base_and_mask(pvt);
for (cs = 0; cs < pvt->cs_count; cs++) {
reg = K8_DCSB0 + (cs * 4);
- err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
- &pvt->dcsb0[cs]);
- if (unlikely(err))
- debugf0("Reading K8_DCSB0[%d] failed\n", cs);
- else
+ if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg, &pvt->dcsb0[cs]))
debugf0(" DCSB0[%d]=0x%08x reg: F2x%x\n",
cs, pvt->dcsb0[cs], reg);
/* If DCT are NOT ganged, then read in DCT1's base */
if (boot_cpu_data.x86 >= 0x10 && !dct_ganging_enabled(pvt)) {
reg = F10_DCSB1 + (cs * 4);
- err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
- &pvt->dcsb1[cs]);
- if (unlikely(err))
- debugf0("Reading F10_DCSB1[%d] failed\n", cs);
- else
+ if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg,
+ &pvt->dcsb1[cs]))
debugf0(" DCSB1[%d]=0x%08x reg: F2x%x\n",
cs, pvt->dcsb1[cs], reg);
} else {
@@ -1022,26 +997,20 @@ static void amd64_read_dct_base_mask(struct amd64_pvt *pvt)
for (cs = 0; cs < pvt->num_dcsm; cs++) {
reg = K8_DCSM0 + (cs * 4);
- err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
- &pvt->dcsm0[cs]);
- if (unlikely(err))
- debugf0("Reading K8_DCSM0 failed\n");
- else
+ if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg, &pvt->dcsm0[cs]))
debugf0(" DCSM0[%d]=0x%08x reg: F2x%x\n",
cs, pvt->dcsm0[cs], reg);
/* If DCT are NOT ganged, then read in DCT1's mask */
if (boot_cpu_data.x86 >= 0x10 && !dct_ganging_enabled(pvt)) {
reg = F10_DCSM1 + (cs * 4);
- err = pci_read_config_dword(pvt->dram_f2_ctl, reg,
- &pvt->dcsm1[cs]);
- if (unlikely(err))
- debugf0("Reading F10_DCSM1[%d] failed\n", cs);
- else
+ if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, reg,
+ &pvt->dcsm1[cs]))
debugf0(" DCSM1[%d]=0x%08x reg: F2x%x\n",
cs, pvt->dcsm1[cs], reg);
- } else
+ } else {
pvt->dcsm1[cs] = 0;
+ }
}
}
@@ -1078,7 +1047,7 @@ static int k8_early_channel_count(struct amd64_pvt *pvt)
{
int flag, err = 0;
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
+ err = amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
if (err)
return err;
@@ -1114,22 +1083,15 @@ static void k8_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
{
u32 low;
u32 off = dram << 3; /* 8 bytes between DRAM entries */
- int err;
- err = pci_read_config_dword(pvt->addr_f1_ctl,
- K8_DRAM_BASE_LOW + off, &low);
- if (err)
- debugf0("Reading K8_DRAM_BASE_LOW failed\n");
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, K8_DRAM_BASE_LOW + off, &low);
/* Extract parts into separate data entries */
pvt->dram_base[dram] = ((u64) low & 0xFFFF0000) << 8;
pvt->dram_IntlvEn[dram] = (low >> 8) & 0x7;
pvt->dram_rw_en[dram] = (low & 0x3);
- err = pci_read_config_dword(pvt->addr_f1_ctl,
- K8_DRAM_LIMIT_LOW + off, &low);
- if (err)
- debugf0("Reading K8_DRAM_LIMIT_LOW failed\n");
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, K8_DRAM_LIMIT_LOW + off, &low);
/*
* Extract parts into separate data entries. Limit is the HIGHEST memory
@@ -1248,16 +1210,13 @@ static int k8_dbam_map_to_pages(struct amd64_pvt *pvt, int dram_map)
static int f10_early_channel_count(struct amd64_pvt *pvt)
{
int dbams[] = { DBAM0, DBAM1 };
- int err = 0, channels = 0;
- int i, j;
+ int i, j, channels = 0;
u32 dbam;
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
- if (err)
+ if (amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0))
goto err_reg;
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_1, &pvt->dclr1);
- if (err)
+ if (amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_1, &pvt->dclr1))
goto err_reg;
/* If we are in 128 bit mode, then we are using 2 channels */
@@ -1283,8 +1242,7 @@ static int f10_early_channel_count(struct amd64_pvt *pvt)
* both controllers since DIMMs can be placed in either one.
*/
for (i = 0; i < ARRAY_SIZE(dbams); i++) {
- err = pci_read_config_dword(pvt->dram_f2_ctl, dbams[i], &dbam);
- if (err)
+ if (amd64_read_pci_cfg(pvt->dram_f2_ctl, dbams[i], &dbam))
goto err_reg;
for (j = 0; j < 4; j++) {
@@ -1314,7 +1272,7 @@ static void amd64_setup(struct amd64_pvt *pvt)
{
u32 reg;
- pci_read_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, ®);
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, ®);
pvt->flags.cf8_extcfg = !!(reg & F10_NB_CFG_LOW_ENABLE_EXT_CFG);
reg |= F10_NB_CFG_LOW_ENABLE_EXT_CFG;
@@ -1326,7 +1284,7 @@ static void amd64_teardown(struct amd64_pvt *pvt)
{
u32 reg;
- pci_read_config_dword(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, ®);
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, F10_NB_CFG_HIGH, ®);
reg &= ~F10_NB_CFG_LOW_ENABLE_EXT_CFG;
if (pvt->flags.cf8_extcfg)
@@ -1355,10 +1313,10 @@ static void f10_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
high_offset = F10_DRAM_BASE_HIGH + (dram << 3);
/* read the 'raw' DRAM BASE Address register */
- pci_read_config_dword(pvt->addr_f1_ctl, low_offset, &low_base);
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, low_offset, &low_base);
/* Read from the ECS data register */
- pci_read_config_dword(pvt->addr_f1_ctl, high_offset, &high_base);
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, high_offset, &high_base);
/* Extract parts into separate data entries */
pvt->dram_rw_en[dram] = (low_base & 0x3);
@@ -1375,10 +1333,10 @@ static void f10_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
high_offset = F10_DRAM_LIMIT_HIGH + (dram << 3);
/* read the 'raw' LIMIT registers */
- pci_read_config_dword(pvt->addr_f1_ctl, low_offset, &low_limit);
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, low_offset, &low_limit);
/* Read from the ECS data register for the HIGH portion */
- pci_read_config_dword(pvt->addr_f1_ctl, high_offset, &high_limit);
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, high_offset, &high_limit);
debugf0(" HW Regs: BASE=0x%08x-%08x LIMIT= 0x%08x-%08x\n",
high_base, low_base, high_limit, low_limit);
@@ -1397,13 +1355,9 @@ static void f10_read_dram_base_limit(struct amd64_pvt *pvt, int dram)
static void f10_read_dram_ctl_register(struct amd64_pvt *pvt)
{
- int err = 0;
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCTL_SEL_LOW,
- &pvt->dram_ctl_select_low);
- if (err) {
- debugf0("Reading F2x110 (DCTL Sel. Low) failed\n");
- } else {
+ if (!amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCTL_SEL_LOW,
+ &pvt->dram_ctl_select_low)) {
debugf0("F2x110 (DCTL Sel. Low): 0x%08x, "
"High range addresses at: 0x%x\n",
pvt->dram_ctl_select_low,
@@ -1428,10 +1382,8 @@ static void f10_read_dram_ctl_register(struct amd64_pvt *pvt)
dct_sel_interleave_addr(pvt));
}
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCTL_SEL_HIGH,
- &pvt->dram_ctl_select_high);
- if (err)
- debugf0("Reading F2x114 (DCT Sel. High) failed\n");
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCTL_SEL_HIGH,
+ &pvt->dram_ctl_select_high);
}
/*
@@ -2082,40 +2034,24 @@ static int amd64_get_error_info_regs(struct mem_ctl_info *mci,
{
struct amd64_pvt *pvt;
struct pci_dev *misc_f3_ctl;
- int err = 0;
pvt = mci->pvt_info;
misc_f3_ctl = pvt->misc_f3_ctl;
- err = pci_read_config_dword(misc_f3_ctl, K8_NBSH, ®s->nbsh);
- if (err)
- goto err_reg;
+ if (amd64_read_pci_cfg(misc_f3_ctl, K8_NBSH, ®s->nbsh))
+ return 0;
if (!(regs->nbsh & K8_NBSH_VALID_BIT))
return 0;
/* valid error, read remaining error information registers */
- err = pci_read_config_dword(misc_f3_ctl, K8_NBSL, ®s->nbsl);
- if (err)
- goto err_reg;
-
- err = pci_read_config_dword(misc_f3_ctl, K8_NBEAL, ®s->nbeal);
- if (err)
- goto err_reg;
-
- err = pci_read_config_dword(misc_f3_ctl, K8_NBEAH, ®s->nbeah);
- if (err)
- goto err_reg;
-
- err = pci_read_config_dword(misc_f3_ctl, K8_NBCFG, ®s->nbcfg);
- if (err)
- goto err_reg;
+ if (amd64_read_pci_cfg(misc_f3_ctl, K8_NBSL, ®s->nbsl) ||
+ amd64_read_pci_cfg(misc_f3_ctl, K8_NBEAL, ®s->nbeal) ||
+ amd64_read_pci_cfg(misc_f3_ctl, K8_NBEAH, ®s->nbeah) ||
+ amd64_read_pci_cfg(misc_f3_ctl, K8_NBCFG, ®s->nbcfg))
+ return 0;
return 1;
-
-err_reg:
- debugf0("Reading error info register failed\n");
- return 0;
}
/*
@@ -2393,7 +2329,7 @@ static void amd64_free_mc_sibling_devices(struct amd64_pvt *pvt)
static void amd64_read_mc_registers(struct amd64_pvt *pvt)
{
u64 msr_val;
- int dram, err = 0;
+ int dram;
/*
* Retrieve TOP_MEM and TOP_MEM2; no masking off of reserved bits since
@@ -2412,9 +2348,7 @@ static void amd64_read_mc_registers(struct amd64_pvt *pvt)
amd64_cpu_display_info(pvt);
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCAP, &pvt->nbcap);
- if (err)
- goto err_reg;
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCAP, &pvt->nbcap);
if (pvt->ops->read_dram_ctl_register)
pvt->ops->read_dram_ctl_register(pvt);
@@ -2451,44 +2385,20 @@ static void amd64_read_mc_registers(struct amd64_pvt *pvt)
amd64_read_dct_base_mask(pvt);
- err = pci_read_config_dword(pvt->addr_f1_ctl, K8_DHAR, &pvt->dhar);
- if (err)
- goto err_reg;
-
+ amd64_read_pci_cfg(pvt->addr_f1_ctl, K8_DHAR, &pvt->dhar);
amd64_read_dbam_reg(pvt);
- err = pci_read_config_dword(pvt->misc_f3_ctl,
- F10_ONLINE_SPARE, &pvt->online_spare);
- if (err)
- goto err_reg;
+ amd64_read_pci_cfg(pvt->misc_f3_ctl,
+ F10_ONLINE_SPARE, &pvt->online_spare);
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
- if (err)
- goto err_reg;
-
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCHR_0, &pvt->dchr0);
- if (err)
- goto err_reg;
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_0, &pvt->dclr0);
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCHR_0, &pvt->dchr0);
if (!dct_ganging_enabled(pvt)) {
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCLR_1,
- &pvt->dclr1);
- if (err)
- goto err_reg;
-
- err = pci_read_config_dword(pvt->dram_f2_ctl, F10_DCHR_1,
- &pvt->dchr1);
- if (err)
- goto err_reg;
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCLR_1, &pvt->dclr1);
+ amd64_read_pci_cfg(pvt->dram_f2_ctl, F10_DCHR_1, &pvt->dchr1);
}
-
amd64_dump_misc_regs(pvt);
-
- return;
-
-err_reg:
- debugf0("Reading an MC register failed\n");
-
}
/*
@@ -2562,13 +2472,11 @@ static int amd64_init_csrows(struct mem_ctl_info *mci)
struct csrow_info *csrow;
struct amd64_pvt *pvt;
u64 input_addr_min, input_addr_max, sys_addr;
- int i, err = 0, empty = 1;
+ int i, empty = 1;
pvt = mci->pvt_info;
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &pvt->nbcfg);
- if (err)
- debugf0("Reading K8_NBCFG failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &pvt->nbcfg);
debugf0("NBCFG= 0x%x CHIPKILL= %s DRAM ECC= %s\n", pvt->nbcfg,
(pvt->nbcfg & K8_NBCFG_CHIPKILL) ? "Enabled" : "Disabled",
@@ -2734,7 +2642,6 @@ static int amd64_toggle_ecc_err_reporting(struct amd64_pvt *pvt, bool on)
static void amd64_enable_ecc_error_reporting(struct mem_ctl_info *mci)
{
struct amd64_pvt *pvt = mci->pvt_info;
- int err = 0;
u32 value, mask = K8_NBCTL_CECCEn | K8_NBCTL_UECCEn;
if (!ecc_enable_override)
@@ -2744,9 +2651,7 @@ static void amd64_enable_ecc_error_reporting(struct mem_ctl_info *mci)
"'ecc_enable_override' parameter is active, "
"Enabling AMD ECC hardware now: CAUTION\n");
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCTL, &value);
- if (err)
- debugf0("Reading K8_NBCTL failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCTL, &value);
/* turn on UECCn and CECCEn bits */
pvt->old_nbctl = value & mask;
@@ -2759,9 +2664,7 @@ static void amd64_enable_ecc_error_reporting(struct mem_ctl_info *mci)
amd64_printk(KERN_WARNING, "Error enabling ECC reporting over "
"MCGCTL!\n");
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &value);
- if (err)
- debugf0("Reading K8_NBCFG failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);
debugf0("NBCFG(1)= 0x%x CHIPKILL= %s ECC_ENABLE= %s\n", value,
(value & K8_NBCFG_CHIPKILL) ? "Enabled" : "Disabled",
@@ -2776,9 +2679,7 @@ static void amd64_enable_ecc_error_reporting(struct mem_ctl_info *mci)
value |= K8_NBCFG_ECC_ENABLE;
pci_write_config_dword(pvt->misc_f3_ctl, K8_NBCFG, value);
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &value);
- if (err)
- debugf0("Reading K8_NBCFG failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);
if (!(value & K8_NBCFG_ECC_ENABLE)) {
amd64_printk(KERN_WARNING,
@@ -2798,15 +2699,12 @@ static void amd64_enable_ecc_error_reporting(struct mem_ctl_info *mci)
static void amd64_restore_ecc_error_reporting(struct amd64_pvt *pvt)
{
- int err = 0;
u32 value, mask = K8_NBCTL_CECCEn | K8_NBCTL_UECCEn;
if (!pvt->nbctl_mcgctl_saved)
return;
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCTL, &value);
- if (err)
- debugf0("Reading K8_NBCTL failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCTL, &value);
value &= ~mask;
value |= pvt->old_nbctl;
@@ -2832,13 +2730,10 @@ static const char *ecc_warning =
static int amd64_check_ecc_enabled(struct amd64_pvt *pvt)
{
u32 value;
- int err = 0;
u8 ecc_enabled = 0;
bool nb_mce_en = false;
- err = pci_read_config_dword(pvt->misc_f3_ctl, K8_NBCFG, &value);
- if (err)
- debugf0("Reading K8_NBCTL failed\n");
+ amd64_read_pci_cfg(pvt->misc_f3_ctl, K8_NBCFG, &value);
ecc_enabled = !!(value & K8_NBCFG_ECC_ENABLE);
if (!ecc_enabled)
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index bba6c94..16f2df4 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -565,6 +565,22 @@ static inline struct low_ops *family_ops(int index)
return &amd64_family_types[index].ops;
}
+static inline int amd64_read_pci_cfg_dword(struct pci_dev *pdev, int offset,
+ u32 *val, const char *func)
+{
+ int err = 0;
+
+ err = pci_read_config_dword(pdev, offset, val);
+ if (err)
+ amd64_printk(KERN_WARNING, "%s: error reading F%dx%x.\n",
+ func, PCI_FUNC(pdev->devfn), offset);
+
+ return err;
+}
+
+#define amd64_read_pci_cfg(pdev, offset, val) \
+ amd64_read_pci_cfg_dword(pdev, offset, val, __func__)
+
/*
* For future CPU versions, verify the following as new 'slow' rates appear and
* modify the necessary skip values for the supported CPU.
--
1.6.4.3
--
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