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amd64_edac: Reorganize error reporting path
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Rewrite CE/UE paths so that they use the same code and drop additional
code duplication in handle_ue. Add a struct err_info which collects
required info for the error reporting. This, in turn, helps slimming all
edac_mc_handle_error() calls down to one.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
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Borislav Petkov authored and Borislav Petkov committed Nov 28, 2012
1 parent c8d1adf commit 33ca064
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Showing 2 changed files with 89 additions and 124 deletions.
194 changes: 71 additions & 123 deletions drivers/edac/amd64_edac.c
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Original file line number Diff line number Diff line change
Expand Up @@ -709,10 +709,10 @@ static inline u64 input_addr_to_sys_addr(struct mem_ctl_info *mci,

/* Map the Error address to a PAGE and PAGE OFFSET. */
static inline void error_address_to_page_and_offset(u64 error_address,
u32 *page, u32 *offset)
struct err_info *err)
{
*page = (u32) (error_address >> PAGE_SHIFT);
*offset = ((u32) error_address) & ~PAGE_MASK;
err->page = (u32) (error_address >> PAGE_SHIFT);
err->offset = ((u32) error_address) & ~PAGE_MASK;
}

/*
Expand Down Expand Up @@ -1023,59 +1023,44 @@ static void read_dram_base_limit_regs(struct amd64_pvt *pvt, unsigned range)
}

static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
u16 syndrome)
struct err_info *err)
{
struct mem_ctl_info *src_mci;
struct amd64_pvt *pvt = mci->pvt_info;
int channel, csrow;
u32 page, offset;

error_address_to_page_and_offset(sys_addr, &page, &offset);
error_address_to_page_and_offset(sys_addr, err);

/*
* Find out which node the error address belongs to. This may be
* different from the node that detected the error.
*/
src_mci = find_mc_by_sys_addr(mci, sys_addr);
if (!src_mci) {
err->src_mci = find_mc_by_sys_addr(mci, sys_addr);
if (!err->src_mci) {
amd64_mc_err(mci, "failed to map error addr 0x%lx to a node\n",
(unsigned long)sys_addr);
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
page, offset, syndrome,
-1, -1, -1,
"failed to map error addr to a node",
"");
err->err_code = ERR_NODE;
return;
}

/* Now map the sys_addr to a CSROW */
csrow = sys_addr_to_csrow(src_mci, sys_addr);
if (csrow < 0) {
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
page, offset, syndrome,
-1, -1, -1,
"failed to map error addr to a csrow",
"");
err->csrow = sys_addr_to_csrow(err->src_mci, sys_addr);
if (err->csrow < 0) {
err->err_code = ERR_CSROW;
return;
}

/* CHIPKILL enabled */
if (pvt->nbcfg & NBCFG_CHIPKILL) {
channel = get_channel_from_ecc_syndrome(mci, syndrome);
if (channel < 0) {
err->channel = get_channel_from_ecc_syndrome(mci, err->syndrome);
if (err->channel < 0) {
/*
* Syndrome didn't map, so we don't know which of the
* 2 DIMMs is in error. So we need to ID 'both' of them
* as suspect.
*/
amd64_mc_warn(src_mci, "unknown syndrome 0x%04x - "
amd64_mc_warn(err->src_mci, "unknown syndrome 0x%04x - "
"possible error reporting race\n",
syndrome);
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
page, offset, syndrome,
csrow, -1, -1,
"unknown syndrome - possible error reporting race",
"");
err->syndrome);
err->err_code = ERR_CHANNEL;
return;
}
} else {
Expand All @@ -1087,13 +1072,8 @@ static void k8_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
* was obtained from email communication with someone at AMD.
* (Wish the email was placed in this comment - norsk)
*/
channel = ((sys_addr & BIT(3)) != 0);
err->channel = ((sys_addr & BIT(3)) != 0);
}

edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, src_mci, 1,
page, offset, syndrome,
csrow, channel, -1,
"", "");
}

static int ddr2_cs_size(unsigned i, bool dct_width)
Expand Down Expand Up @@ -1479,7 +1459,7 @@ static u64 f1x_swap_interleaved_region(struct amd64_pvt *pvt, u64 sys_addr)

/* For a given @dram_range, check if @sys_addr falls within it. */
static int f1x_match_to_this_node(struct amd64_pvt *pvt, unsigned range,
u64 sys_addr, int *nid, int *chan_sel)
u64 sys_addr, int *chan_sel)
{
int cs_found = -EINVAL;
u64 chan_addr;
Expand Down Expand Up @@ -1552,15 +1532,14 @@ static int f1x_match_to_this_node(struct amd64_pvt *pvt, unsigned range,

cs_found = f1x_lookup_addr_in_dct(chan_addr, node_id, channel);

if (cs_found >= 0) {
*nid = node_id;
if (cs_found >= 0)
*chan_sel = channel;
}

return cs_found;
}

static int f1x_translate_sysaddr_to_cs(struct amd64_pvt *pvt, u64 sys_addr,
int *node, int *chan_sel)
int *chan_sel)
{
int cs_found = -EINVAL;
unsigned range;
Expand All @@ -1574,8 +1553,7 @@ static int f1x_translate_sysaddr_to_cs(struct amd64_pvt *pvt, u64 sys_addr,
(get_dram_limit(pvt, range) >= sys_addr)) {

cs_found = f1x_match_to_this_node(pvt, range,
sys_addr, node,
chan_sel);
sys_addr, chan_sel);
if (cs_found >= 0)
break;
}
Expand All @@ -1591,22 +1569,15 @@ static int f1x_translate_sysaddr_to_cs(struct amd64_pvt *pvt, u64 sys_addr,
* (MCX_ADDR).
*/
static void f1x_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
u16 syndrome)
struct err_info *err)
{
struct amd64_pvt *pvt = mci->pvt_info;
u32 page, offset;
int nid, csrow, chan = 0;

error_address_to_page_and_offset(sys_addr, &page, &offset);
error_address_to_page_and_offset(sys_addr, err);

csrow = f1x_translate_sysaddr_to_cs(pvt, sys_addr, &nid, &chan);

if (csrow < 0) {
edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
page, offset, syndrome,
-1, -1, -1,
"failed to map error addr to a csrow",
"");
err->csrow = f1x_translate_sysaddr_to_cs(pvt, sys_addr, &err->channel);
if (err->csrow < 0) {
err->err_code = ERR_CSROW;
return;
}

Expand All @@ -1616,12 +1587,7 @@ static void f1x_map_sysaddr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr,
* this point.
*/
if (dct_ganging_enabled(pvt))
chan = get_channel_from_ecc_syndrome(mci, syndrome);

edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
page, offset, syndrome,
csrow, chan, -1,
"", "");
err->channel = get_channel_from_ecc_syndrome(mci, err->syndrome);
}

/*
Expand Down Expand Up @@ -1890,78 +1856,54 @@ static int get_channel_from_ecc_syndrome(struct mem_ctl_info *mci, u16 syndrome)
return map_err_sym_to_channel(err_sym, pvt->ecc_sym_sz);
}

/*
* Handle any Correctable Errors (CEs) that have occurred. Check for valid ERROR
* ADDRESS and process.
*/
static void amd64_handle_ce(struct mem_ctl_info *mci, struct mce *m)
static void __log_bus_error(struct mem_ctl_info *mci, struct err_info *err,
u8 ecc_type)
{
struct amd64_pvt *pvt = mci->pvt_info;
u64 sys_addr;
u16 syndrome;

sys_addr = get_error_address(m);
syndrome = extract_syndrome(m->status);

amd64_mc_err(mci, "CE ERROR_ADDRESS= 0x%llx\n", sys_addr);
enum hw_event_mc_err_type err_type;
const char *string;

pvt->ops->map_sysaddr_to_csrow(mci, sys_addr, syndrome);
}

/* Handle any Un-correctable Errors (UEs) */
static void amd64_handle_ue(struct mem_ctl_info *mci, struct mce *m)
{
struct mem_ctl_info *log_mci, *src_mci = NULL;
int csrow;
u64 sys_addr;
u32 page, offset;

log_mci = mci;

sys_addr = get_error_address(m);
error_address_to_page_and_offset(sys_addr, &page, &offset);

/*
* Find out which node the error address belongs to. This may be
* different from the node that detected the error.
*/
src_mci = find_mc_by_sys_addr(mci, sys_addr);
if (!src_mci) {
amd64_mc_err(mci, "ERROR ADDRESS (0x%lx) NOT mapped to a MC\n",
(unsigned long)sys_addr);
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
page, offset, 0,
-1, -1, -1,
"ERROR ADDRESS NOT mapped to a MC",
"");
if (ecc_type == 2)
err_type = HW_EVENT_ERR_CORRECTED;
else if (ecc_type == 1)
err_type = HW_EVENT_ERR_UNCORRECTED;
else {
WARN(1, "Something is rotten in the state of Denmark.\n");
return;
}

log_mci = src_mci;

csrow = sys_addr_to_csrow(log_mci, sys_addr);
if (csrow < 0) {
amd64_mc_err(mci, "ERROR_ADDRESS (0x%lx) NOT mapped to CS\n",
(unsigned long)sys_addr);
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
page, offset, 0,
-1, -1, -1,
"ERROR ADDRESS NOT mapped to CS",
"");
} else {
edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
page, offset, 0,
csrow, -1, -1,
"", "");
switch (err->err_code) {
case DECODE_OK:
string = "";
break;
case ERR_NODE:
string = "Failed to map error addr to a node";
break;
case ERR_CSROW:
string = "Failed to map error addr to a csrow";
break;
case ERR_CHANNEL:
string = "unknown syndrome - possible error reporting race";
break;
default:
string = "WTF error";
break;
}

edac_mc_handle_error(err_type, mci, 1,
err->page, err->offset, err->syndrome,
err->csrow, err->channel, -1,
string, "");
}

static inline void __amd64_decode_bus_error(struct mem_ctl_info *mci,
struct mce *m)
{
struct amd64_pvt *pvt = mci->pvt_info;
u8 ecc_type = (m->status >> 45) & 0x3;
u8 xec = XEC(m->status, 0x1f);
u16 ec = EC(m->status);
u64 sys_addr;
struct err_info err;

/* Bail out early if this was an 'observed' error */
if (PP(ec) == NBSL_PP_OBS)
Expand All @@ -1971,10 +1913,16 @@ static inline void __amd64_decode_bus_error(struct mem_ctl_info *mci,
if (xec && xec != F10_NBSL_EXT_ERR_ECC)
return;

memset(&err, 0, sizeof(err));

sys_addr = get_error_address(m);

if (ecc_type == 2)
amd64_handle_ce(mci, m);
else if (ecc_type == 1)
amd64_handle_ue(mci, m);
err.syndrome = extract_syndrome(m->status);

pvt->ops->map_sysaddr_to_csrow(mci, sys_addr, &err);

__log_bus_error(mci, &err, ecc_type);
}

void amd64_decode_bus_error(int node_id, struct mce *m)
Expand Down
19 changes: 18 additions & 1 deletion drivers/edac/amd64_edac.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -376,6 +376,23 @@ struct amd64_pvt {
struct error_injection injection;
};

enum err_codes {
DECODE_OK = 0,
ERR_NODE = -1,
ERR_CSROW = -2,
ERR_CHANNEL = -3,
};

struct err_info {
int err_code;
struct mem_ctl_info *src_mci;
int csrow;
int channel;
u16 syndrome;
u32 page;
u32 offset;
};

static inline u64 get_dram_base(struct amd64_pvt *pvt, unsigned i)
{
u64 addr = ((u64)pvt->ranges[i].base.lo & 0xffff0000) << 8;
Expand Down Expand Up @@ -449,7 +466,7 @@ static inline void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci)
struct low_ops {
int (*early_channel_count) (struct amd64_pvt *pvt);
void (*map_sysaddr_to_csrow) (struct mem_ctl_info *mci, u64 sys_addr,
u16 syndrome);
struct err_info *);
int (*dbam_to_cs) (struct amd64_pvt *pvt, u8 dct, unsigned cs_mode);
int (*read_dct_pci_cfg) (struct amd64_pvt *pvt, int offset,
u32 *val, const char *func);
Expand Down

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