On Thu, Jan 23, 2025 at 09:59:41AM -0800, Jose Souza wrote:
From: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Commit 70fb86a85dc9 ("drm/xe: Revert some changes that break a mesa
debug tool") partially reverted some changes to workaround breakage
caused to mesa tools. However, in doing so it also broke fetching the
GuC log via debugfs since xe_print_blob_ascii85() simply bails out.
The fix is to avoid the extra newlines: the devcoredump interface is
line-oriented and adding random newlines in the middle breaks it. If a
tool is able to parse it by looking at the data and checking for chars
that are out of the ascii85 space, it can still do so. A format change
that breaks the line-oriented output on devcoredump however needs better
coordination with existing tools.
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
Cc: John Harrison <John.C.Harrison@xxxxxxxxx>
Cc: Julia Filipchuk <julia.filipchuk@xxxxxxxxx>
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 70fb86a85dc9 ("drm/xe: Revert some changes that break a mesa debug tool")
Fixes: ec1455ce7e35 ("drm/xe/devcoredump: Add ASCII85 dump helper function")
Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
---
drivers/gpu/drm/xe/xe_devcoredump.c | 30 +++++++++--------------------
drivers/gpu/drm/xe/xe_devcoredump.h | 2 +-
drivers/gpu/drm/xe/xe_guc_ct.c | 3 ++-
drivers/gpu/drm/xe/xe_guc_log.c | 4 +++-
4 files changed, 15 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c
index 81dc7795c0651..1c86e6456d60f 100644
--- a/drivers/gpu/drm/xe/xe_devcoredump.c
+++ b/drivers/gpu/drm/xe/xe_devcoredump.c
@@ -395,42 +395,30 @@ int xe_devcoredump_init(struct xe_device *xe)
/**
* xe_print_blob_ascii85 - print a BLOB to some useful location in ASCII85
*
- * The output is split to multiple lines because some print targets, e.g. dmesg
- * cannot handle arbitrarily long lines. Note also that printing to dmesg in
- * piece-meal fashion is not possible, each separate call to drm_puts() has a
- * line-feed automatically added! Therefore, the entire output line must be
- * constructed in a local buffer first, then printed in one atomic output call.
+ * The output is split to multiple print calls because some print targets, e.g.
+ * dmesg cannot handle arbitrarily long lines. These targets may add newline
+ * between calls.
*
* There is also a scheduler yield call to prevent the 'task has been stuck for
* 120s' kernel hang check feature from firing when printing to a slow target
* such as dmesg over a serial port.
*
- * TODO: Add compression prior to the ASCII85 encoding to shrink huge buffers down.
- *
* @p: the printer object to output to
* @prefix: optional prefix to add to output string
let's just make sure to document suffix
* @suffix: optional suffix to add at the end. 0 disables it and is
* not added to the output, which is useful when using multiple calls
* to dump data to @p
Lucas De Marchi
* @blob: the Binary Large OBject to dump out
* @offset: offset in bytes to skip from the front of the BLOB, must be a multiple of sizeof(u32)
* @size: the size in bytes of the BLOB, must be a multiple of sizeof(u32)
*/
-void xe_print_blob_ascii85(struct drm_printer *p, const char *prefix,
+void xe_print_blob_ascii85(struct drm_printer *p, const char *prefix, char suffix,
const void *blob, size_t offset, size_t size)
{
const u32 *blob32 = (const u32 *)blob;
char buff[ASCII85_BUFSZ], *line_buff;
size_t line_pos = 0;
- /*
- * Splitting blobs across multiple lines is not compatible with the mesa
- * debug decoder tool. Note that even dropping the explicit '\n' below
- * doesn't help because the GuC log is so big some underlying implementation
- * still splits the lines at 512K characters. So just bail completely for
- * the moment.
- */
- return;
-
#define DMESG_MAX_LINE_LEN 800
-#define MIN_SPACE (ASCII85_BUFSZ + 2) /* 85 + "\n\0" */
+ /* Always leave space for the suffix char and the \0 */
+#define MIN_SPACE (ASCII85_BUFSZ + 2) /* 85 + "<suffix>\0" */
if (size & 3)
drm_printf(p, "Size not word aligned: %zu", size);
@@ -462,7 +450,6 @@ void xe_print_blob_ascii85(struct drm_printer *p, const char *prefix,
line_pos += strlen(line_buff + line_pos);
if ((line_pos + MIN_SPACE) >= DMESG_MAX_LINE_LEN) {
- line_buff[line_pos++] = '\n';
line_buff[line_pos++] = 0;
drm_puts(p, line_buff);
@@ -474,10 +461,11 @@ void xe_print_blob_ascii85(struct drm_printer *p, const char *prefix,
}
}
+ if (suffix)
+ line_buff[line_pos++] = suffix;
+
if (line_pos) {
- line_buff[line_pos++] = '\n';
line_buff[line_pos++] = 0;
-
drm_puts(p, line_buff);
}
diff --git a/drivers/gpu/drm/xe/xe_devcoredump.h b/drivers/gpu/drm/xe/xe_devcoredump.h
index 6a17e6d601022..5391a80a4d1ba 100644
--- a/drivers/gpu/drm/xe/xe_devcoredump.h
+++ b/drivers/gpu/drm/xe/xe_devcoredump.h
@@ -29,7 +29,7 @@ static inline int xe_devcoredump_init(struct xe_device *xe)
}
#endif
-void xe_print_blob_ascii85(struct drm_printer *p, const char *prefix,
+void xe_print_blob_ascii85(struct drm_printer *p, const char *prefix, char suffix,
const void *blob, size_t offset, size_t size);
#endif
diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
index 8b65c5e959cc2..50c8076b51585 100644
--- a/drivers/gpu/drm/xe/xe_guc_ct.c
+++ b/drivers/gpu/drm/xe/xe_guc_ct.c
@@ -1724,7 +1724,8 @@ void xe_guc_ct_snapshot_print(struct xe_guc_ct_snapshot *snapshot,
snapshot->g2h_outstanding);
if (snapshot->ctb)
- xe_print_blob_ascii85(p, "CTB data", snapshot->ctb, 0, snapshot->ctb_size);
+ xe_print_blob_ascii85(p, "CTB data", '\n',
+ snapshot->ctb, 0, snapshot->ctb_size);
} else {
drm_puts(p, "CT disabled\n");
}
diff --git a/drivers/gpu/drm/xe/xe_guc_log.c b/drivers/gpu/drm/xe/xe_guc_log.c
index 80151ff6a71f8..44482ea919924 100644
--- a/drivers/gpu/drm/xe/xe_guc_log.c
+++ b/drivers/gpu/drm/xe/xe_guc_log.c
@@ -207,8 +207,10 @@ void xe_guc_log_snapshot_print(struct xe_guc_log_snapshot *snapshot, struct drm_
remain = snapshot->size;
for (i = 0; i < snapshot->num_chunks; i++) {
size_t size = min(GUC_LOG_CHUNK_SIZE, remain);
+ const char *prefix = i ? NULL : "Log data";
+ char suffix = i == snapshot->num_chunks - 1 ? '\n' : 0;
- xe_print_blob_ascii85(p, i ? NULL : "Log data", snapshot->copy[i], 0, size);
+ xe_print_blob_ascii85(p, prefix, suffix, snapshot->copy[i], 0, size);
remain -= size;
}
}
--
2.48.1
