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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH v2 3/8] lib/ukdebug: save actual data into tracebuffer
Macro UK_TRACEPOINT generates a static function. One per
tracepoint. Later user will call this function to store data into the
tracebuffer
Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
---
lib/ukdebug/Makefile.uk | 1 +
lib/ukdebug/exportsyms.uk | 2 +
lib/ukdebug/include/uk/trace.h | 122 ++++++++++++++++++++++++++++++++-
lib/ukdebug/trace.c | 45 ++++++++++++
4 files changed, 169 insertions(+), 1 deletion(-)
create mode 100644 lib/ukdebug/trace.c
diff --git a/lib/ukdebug/Makefile.uk b/lib/ukdebug/Makefile.uk
index abc340dd..e2e6fd2a 100644
--- a/lib/ukdebug/Makefile.uk
+++ b/lib/ukdebug/Makefile.uk
@@ -8,6 +8,7 @@ LIBUKDEBUG_CXXFLAGS-y += -D__IN_LIBUKDEBUG__
LIBUKDEBUG_SRCS-y += $(LIBUKDEBUG_BASE)/print.c
LIBUKDEBUG_SRCS-y += $(LIBUKDEBUG_BASE)/hexdump.c
+LIBUKDEBUG_SRCS-$(CONFIG_LIBUKDEBUG_TRACEPOINTS) += $(LIBUKDEBUG_BASE)/trace.c
EXTRA_LD_SCRIPT-$(CONFIG_LIBVFSCORE) += $(LIBUKDEBUG_BASE)/extra.ld
STRIP_SECTIONS_FLAGS-$(CONFIG_LIBUKDEBUG_TRACEPOINTS) += -R
.uk_tracepoints_list
diff --git a/lib/ukdebug/exportsyms.uk b/lib/ukdebug/exportsyms.uk
index cb8d2403..9763768f 100644
--- a/lib/ukdebug/exportsyms.uk
+++ b/lib/ukdebug/exportsyms.uk
@@ -7,3 +7,5 @@ uk_hexdumpf
uk_hexdumpd
_uk_hexdumpd
_uk_hexdumpk
+uk_trace_buffer_free
+uk_trace_buffer_writep
diff --git a/lib/ukdebug/include/uk/trace.h b/lib/ukdebug/include/uk/trace.h
index a4d6cf05..911ca6a6 100644
--- a/lib/ukdebug/include/uk/trace.h
+++ b/lib/ukdebug/include/uk/trace.h
@@ -36,7 +36,19 @@
#define _UK_TRACE_H_
#include <uk/essentials.h>
#include <stdint.h>
+#include <stddef.h>
+#include <uk/plat/time.h>
+#include <string.h>
+#include <uk/arch/lcpu.h>
+#include <uk/plat/lcpu.h>
+/* There is no justification of the limit of 80 symbols. But there
+ * must be a limit anyways. Just number from the coding standard is
+ * used. Feel free to change this limit if you have the actual reason
+ * for another number
+ */
+#define __UK_TRACE_MAX_STRLEN 80
+#define UK_TP_HEADER_MAGIC 0x64685254 /* TRhd */
#define UK_TP_DEF_MAGIC 0x65645054 /* TPde */
enum __uk_trace_arg_type {
@@ -44,6 +56,16 @@ enum __uk_trace_arg_type {
__UK_TRACE_ARG_STRING = 1,
};
+struct uk_tracepoint_header {
+ uint32_t magic;
+ uint32_t size;
+ __nsec time;
+ void *cookie;
+};
+
+extern size_t uk_trace_buffer_free;
+extern char *uk_trace_buffer_writep;
+
/* TODO: consider to move UK_CONCAT into public headers */
#define __UK_CONCAT_X(a, b) a##b
#define UK_CONCAT(a, b) __UK_CONCAT_X(a, b)
@@ -51,6 +73,45 @@ enum __uk_trace_arg_type {
#define __UK_NARGS_X(a, b, c, d, e, f, g, h, n, ...) n
#define UK_NARGS(...) __UK_NARGS_X(, ##__VA_ARGS__, 7, 6, 5, 4, 3, 2, 1, 0)
+
+static inline void __uk_trace_save_arg(char **pbuff,
+ size_t *pfree,
+ enum __uk_trace_arg_type type,
+ int size,
+ long arg)
+{
+ char *buff = *pbuff;
+ size_t free = *pfree;
+ int len;
+
+ if (type == __UK_TRACE_ARG_STRING) {
+ len = strnlen((char *) arg, __UK_TRACE_MAX_STRLEN);
+ /* The '+1' is for storing length of the string */
+ size = len + 1;
+ }
+
+ if (free < (size_t) size) {
+ /* Block the next invocations of trace points */
+ *pfree = 0;
+ uk_trace_buffer_free = 0;
+ return;
+ }
+
+ switch (type) {
+ case __UK_TRACE_ARG_INT:
+ /* for simplicity we do not care about alignment */
+ memcpy(buff, &arg, size);
+ break;
+ case __UK_TRACE_ARG_STRING:
+ *((uint8_t *) buff) = len;
+ memcpy(buff + 1, (char *) arg, len);
+ break;
+ }
+
+ *pbuff = buff + size;
+ *pfree -= size;
+}
+
#define __UK_TRACE_GET_TYPE(arg) ( \
__builtin_types_compatible_p(typeof(arg), const char *) * \
__UK_TRACE_ARG_STRING + \
@@ -58,6 +119,22 @@ enum __uk_trace_arg_type {
__UK_TRACE_ARG_STRING + \
0)
+#define __UK_TRACE_SAVE_ONE(arg) __uk_trace_save_arg( \
+ &buff, \
+ &free, \
+ __UK_TRACE_GET_TYPE(arg), \
+ sizeof(arg), \
+ (long) arg)
+
+#define __UK_TRACE_SAVE_ARGS0()
+#define __UK_TRACE_SAVE_ARGS1() __UK_TRACE_SAVE_ONE(arg1)
+#define __UK_TRACE_SAVE_ARGS2() __UK_TRACE_SAVE_ARGS1();
__UK_TRACE_SAVE_ONE(arg2)
+#define __UK_TRACE_SAVE_ARGS3() __UK_TRACE_SAVE_ARGS2();
__UK_TRACE_SAVE_ONE(arg3)
+#define __UK_TRACE_SAVE_ARGS4() __UK_TRACE_SAVE_ARGS3();
__UK_TRACE_SAVE_ONE(arg4)
+#define __UK_TRACE_SAVE_ARGS5() __UK_TRACE_SAVE_ARGS4();
__UK_TRACE_SAVE_ONE(arg5)
+#define __UK_TRACE_SAVE_ARGS6() __UK_TRACE_SAVE_ARGS5();
__UK_TRACE_SAVE_ONE(arg6)
+#define __UK_TRACE_SAVE_ARGS7() __UK_TRACE_SAVE_ARGS6();
__UK_TRACE_SAVE_ONE(arg7)
+
#define __UK_GET_ARG1(a1, ...) a1
#define __UK_GET_ARG2(a1, a2, ...) a2
#define __UK_GET_ARG3(a1, a2, a3, ...) a3
@@ -127,6 +204,40 @@ enum __uk_trace_arg_type {
__UK_TRACE_ARG_TYPES(NR, __VA_ARGS__), \
#trace_name, fmt }
+static inline char *__uk_trace_get_buff(size_t *free)
+{
+ struct uk_tracepoint_header *ret;
+
+ if (uk_trace_buffer_free < sizeof(*ret))
+ return 0;
+ ret = (struct uk_tracepoint_header *) uk_trace_buffer_writep;
+
+ /* In case we fail to fill the tracepoint for any reason, make
+ * sure we do not confuse parser. We fill the header only
+ * after the full tracepoint is completed
+ */
+ ret->magic = 0;
+ *free = uk_trace_buffer_free - sizeof(*ret);
+ return (char *) (ret + 1);
+}
+
+static inline void __uk_trace_finalize_buff(char *new_buff_pos, void *cookie)
+{
+ uint32_t size;
+ struct uk_tracepoint_header *head =
+ (struct uk_tracepoint_header *) uk_trace_buffer_writep;
+
+ size = new_buff_pos - uk_trace_buffer_writep;
+ uk_trace_buffer_writep += size;
+ uk_trace_buffer_free -= size;
+
+ head->time = ukplat_monotonic_clock();
+ head->size = size - sizeof(*head);
+ head->cookie = cookie;
+ barrier();
+ head->magic = UK_TP_HEADER_MAGIC;
+}
+
/* Makes from "const char*" "const char* arg1".
*/
#define __UK_ARGS_MAP_FN(n, t) t UK_CONCAT(arg, n)
@@ -143,8 +254,17 @@ enum __uk_trace_arg_type {
#define ____UK_TRACEPOINT(n, regdata_name, trace_name, fmt, ...) \
__UK_TRACE_REG(n, regdata_name, trace_name, fmt, \
__VA_ARGS__); \
- static inline void trace_name(__UK_TRACE_ARGS_MAP_UNUSED(n,
__VA_ARGS__)) \
+ static inline void trace_name(__UK_TRACE_ARGS_MAP(n, __VA_ARGS__)) \
{ \
+ unsigned long flags = ukplat_lcpu_save_irqf(); \
+ size_t free __maybe_unused; \
+ char *buff = __uk_trace_get_buff(&free); \
+ if (buff) { \
+ __UK_TRACE_SAVE_ARGS ## n(); \
+ __uk_trace_finalize_buff( \
+ buff, ®data_name); \
+ } \
+ ukplat_lcpu_restore_irqf(flags); \
}
#else
#define ____UK_TRACEPOINT(n, regdata_name, trace_name, fmt, ...) \
diff --git a/lib/ukdebug/trace.c b/lib/ukdebug/trace.c
new file mode 100644
index 00000000..f3318557
--- /dev/null
+++ b/lib/ukdebug/trace.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
+ *
+ * Copyright (c) 2019, NEC Laboratories Europe GmbH, NEC Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <stddef.h>
+#include <uk/essentials.h>
+
+/* TODO: Implement a circular buffer. Currently, if the buffer is
+ * full, tracing disables itself.
+ */
+#define UK_TRACE_BUFFER_SIZE 16384
+char uk_trace_buffer[UK_TRACE_BUFFER_SIZE];
+
+size_t uk_trace_buffer_free = UK_TRACE_BUFFER_SIZE;
+char *uk_trace_buffer_writep = uk_trace_buffer;
--
2.19.2
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