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Subject[PATCH] ftrace: Add new entry type TRACE_BIN_DUMP
Date
The ftrace dump_entry can be used to dump binary data from
kernel to userspace.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

---
kernel/trace/trace.c | 8 ++++++++
kernel/trace/trace.h | 11 +++++++++++
2 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c0d1170..004aafd 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2106,6 +2106,14 @@ static enum print_line_t print_dump_fmt(struct trace_iterator *iter)
trace_seq_print_cont(s, iter);
break;
}
+ case TRACE_BIN_DUMP: {
+ struct dump_entry *field;
+
+ trace_assign_type(field, entry);
+
+ trace_seq_putmem(s, field->buf, field->len);
+ break;
+ }
}
return TRACE_TYPE_HANDLED;
}
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 358d2a6..b24d350 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -26,6 +26,7 @@ enum trace_type {
TRACE_BOOT_CALL,
TRACE_BOOT_RET,
TRACE_FN_RET,
+ TRACE_BIN_DUMP,

__TRACE_LAST_TYPE
};
@@ -107,6 +108,15 @@ struct print_entry {
char buf[];
};

+/*
+ * bin dump entry:
+ */
+struct dump_entry {
+ struct trace_entry ent;
+ int len;
+ char buf[];
+};
+
#define TRACE_OLD_SIZE 88

struct trace_field_cont {
@@ -249,6 +259,7 @@ extern void __ftrace_bad_type(void);
IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
IF_ASSIGN(var, ent, struct ftrace_ret_entry, TRACE_FN_RET);\
+ IF_ASSIGN(var, ent, struct dump_entry, TRACE_BIN_DUMP); \
__ftrace_bad_type(); \
} while (0)

--
tg: (b382bc2..) an/ftrace-bin-dump.patch (depends on: an/ftrace-dp-printk.patch)

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