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nvme: plot eye chart data and hex dumping VS eye data #2828

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nvme: plot eye chart data and hex dumping VS eye data #2828

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f45b402
nvme: plot eye chart data and hex dumping VS eye data
sivaprasad6541 May 27, 2025
d69c312
plugins/micron: update authors list
sivaprasad6541 May 27, 2025
a404eb3
nvme: plot eye chart and hex dumping VS eye data
sivaprasad6541 May 29, 2025
1b18547
nvme: eye chart plotting and dump VS eye data
sivaprasad6541 May 29, 2025
43097ad
nvme: eye chart plotting and dump VS eye data
sivaprasad6541 Jun 4, 2025
1b88468
wdc: Fix for vs-smart-add-log wdc plugin command
jeff-lien-sndk May 27, 2025
6226e29
Merge branch 'master' into pull-and-parse-eye-data-19h
sivaprasad6541 Jun 13, 2025
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51 changes: 29 additions & 22 deletions nvme-print-json.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2121,11 +2121,11 @@ static void json_boot_part_log(void *bp_log, const char *devname,

/* Printable Eye string is allocated and returned, caller must free */
static char *json_eom_printable_eye(struct nvme_eom_lane_desc *lane,
struct json_object *r)
struct json_object *r)
{
char *eye = (char *)lane->eye_desc;
uint16_t nrows = lane->nrows;
uint16_t ncols = lane->ncols;
uint16_t nrows = le16_to_cpu(lane->nrows);
uint16_t ncols = le16_to_cpu(lane->ncols);

if (nrows == 0 || ncols == 0)
return NULL;
Expand All @@ -2139,11 +2139,19 @@ static char *json_eom_printable_eye(struct nvme_eom_lane_desc *lane,

struct json_object *eye_array = json_create_array();
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@igaw igaw May 27, 2025

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If we are checking for null pointers, then this one should also be checked I suppose.

And don't we need to free it eventually? In this case use the cleanup helpers so that you can exit the funtion at anytime. Can't remember what json-c does, if it takes the owner ship.

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@sivaprasad6541 sivaprasad6541 May 29, 2025 •
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Thanks for the suggestion! I initially tried using cleanup helpers, but encountered a segfault in the caller while printing the root JSON object. Since the caller is responsible for freeing the memory, I've kept the manual cleanup logic in place to avoid ownership issues.
Added a null check for eye_array now.

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@igaw igaw Jun 2, 2025

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again declaration go to the beginning of the block

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@sivaprasad6541 sivaprasad6541 Jun 4, 2025

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Moved this to beginning of the block.


if (!eye_array) {
free(printable);
return NULL;
}

for (int i = 0; i < nrows; i++) {
char *row = malloc(ncols + 1);

if (!row)
continue;
if (!row) {
// Cleanup on failure
free(printable_start);
return NULL;
}

for (int j = 0; j < ncols; j++) {
char ch = eye[i * ncols + j];
Expand All @@ -2160,7 +2168,7 @@ static char *json_eom_printable_eye(struct nvme_eom_lane_desc *lane,

*printable = '\0';

obj_add_array(r, "printable_eye_rows", eye_array);
obj_add_array(r, "printable_eye", eye_array);

return printable_start;
}
Expand Down Expand Up @@ -2197,26 +2205,25 @@ static void json_phy_rx_eom_descs(struct nvme_phy_rx_eom_log *log,

if (desc->edlen == 0)
continue;
else {
/* Hex dump Vendor Specific Eye Data*/
vsdata = (unsigned char *)malloc(desc->edlen);
vsdataoffset = (desc->nrows * desc->ncols) +
sizeof(struct nvme_eom_lane_desc);
vsdata = (unsigned char *)((unsigned char *)desc + vsdataoffset);
char *hexstr = malloc(desc->edlen * 3 + 1); // 2 hex chars + space per byte

if (!hexstr)
return;
/* Hex dump Vendor Specific Eye Data*/
vsdataoffset = (le16_to_cpu(desc->nrows) * le16_to_cpu(desc->ncols)) +
sizeof(struct nvme_eom_lane_desc);
vsdata = (unsigned char *)((unsigned char *)desc + vsdataoffset);
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@igaw igaw Jun 2, 2025

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I would first do the allocation (hexstr) before the computation.

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@sivaprasad6541 sivaprasad6541 Jun 4, 2025

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Modified as suggested.

// 2 hex chars + space per byte
_cleanup_free_ char *hexstr = malloc(le16_to_cpu(desc->edlen) * 3 + 1);
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@igaw igaw Jun 2, 2025

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Please introduce local variable for nrows ncols and edlen so you only need to to the cpu conversion once.

Also while at it please use consistent comment style.

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@sivaprasad6541 sivaprasad6541 Jun 4, 2025

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Modified as suggested.


char *p = hexstr;
if (!hexstr)
return;

for (int offset = 0; offset < desc->edlen; offset++)
p += sprintf(p, "%02X ", vsdata[offset]);
*(p - 1) = '\0'; // remove trailing space
char *hexdata = hexstr;

for (int offset = 0; offset < le16_to_cpu(desc->edlen); offset++)
hexdata += sprintf(hexdata, "%02X ", vsdata[offset]);
*(hexdata - 1) = '\0'; // remove trailing space

obj_add_str(jdesc, "vsdata_hex", hexstr);

obj_add_str(jdesc, "vsdata_hex", hexstr);
free(hexstr);
}
array_add_obj(descs, jdesc);

p += log->dsize;
Expand Down
19 changes: 9 additions & 10 deletions nvme-print-stdout.c
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Original file line number Diff line number Diff line change
Expand Up @@ -811,16 +811,15 @@ static void stdout_phy_rx_eom_descs(struct nvme_phy_rx_eom_log *log)
/* Eye Data field is vendor specific */
if (desc->edlen == 0)
continue;
else {
/* Hex dump Vendor Specific Eye Data */
vsdata = (unsigned char *)malloc(desc->edlen);
vsdataoffset = (desc->nrows * desc->ncols) +
sizeof(struct nvme_eom_lane_desc);
vsdata = (unsigned char *)((unsigned char *)desc + vsdataoffset);
printf("Eye Data:\n");
d(vsdata, desc->edlen, 16, 1);
printf("\n");
}

/* Hex dump Vendor Specific Eye Data */
vsdata = malloc(desc->edlen);
vsdataoffset = (desc->nrows * desc->ncols) +
sizeof(struct nvme_eom_lane_desc);
vsdata = (unsigned char *)((unsigned char *)desc + vsdataoffset);
printf("Eye Data:\n");
d(vsdata, desc->edlen, 16, 1);
printf("\n");

p += log->dsize;
}
Expand Down