trace: Put global trace context entries to separate section

To allow changing trace level of global elements, like
system agent or component driver, than it must be possible
to find corresponding trace context.
It is the first step to allow iterating over the trace context
entries and find what we are looking for. Linker variables
_trace_ctx_start and _trace_ctx_end will be needed to know
this section size in runtime code.

Signed-off-by: Karol Trzcinski <karolx.trzcinski@linux.intel.com>

Author: ktrzcinx

src/include/sof/trace/trace.h

@@ -297,7 +297,11 @@ struct tr_ctx {
 	uint32_t level;		/**< Default log level */
 };
 
-/* todo: put in a section to iterate over later while cfg log levels */
+#if defined(UNIT_TEST)
+#define TRACE_CONTEXT_SECTION
+#else
+#define TRACE_CONTEXT_SECTION __section(".trace_ctx")
+#endif
 
 /**
  * Declares trace context.
@@ -306,7 +310,7 @@ struct tr_ctx {
  * @param default_log_level Default log level.
  */
 #define DECLARE_TR_CTX(ctx_name, uuid, default_log_level) \
-	struct tr_ctx ctx_name = { \
+	struct tr_ctx ctx_name TRACE_CONTEXT_SECTION = { \
 			.uuid_p = uuid, \
 			.level = default_log_level, \
 	}

src/platform/apollolake/apollolake.x.in

@@ -446,6 +446,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_fw :sof_fw_phdr
 

src/platform/baytrail/baytrail.x.in

@@ -410,6 +410,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_data :sof_data_phdr
 

src/platform/cannonlake/cannonlake.x.in

@@ -411,6 +411,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_fw :sof_fw_phdr
 

src/platform/haswell/haswell.x.in

@@ -418,6 +418,9 @@ SECTIONS
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
     _data_end = ABSOLUTE(.);
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
   } >sof_data :sof_data_phdr
 
   .lit4 : ALIGN(4)

src/platform/icelake/icelake.x.in

@@ -415,6 +415,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_fw :sof_fw_phdr
 

src/platform/imx8/imx8.x.in

@@ -374,6 +374,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_sdram0 :sof_sdram0_phdr
 

src/platform/imx8m/imx8m.x.in

@@ -374,6 +374,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_sdram0 :sof_sdram0_phdr
 

src/platform/suecreek/suecreek.x.in

@@ -413,6 +413,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_fw :sof_fw_phdr
 

src/platform/tigerlake/tigerlake.x.in

@@ -465,6 +465,9 @@ SECTIONS
     *(.sdata2.*)
     *(.gnu.linkonce.s2.*)
     KEEP(*(.jcr))
+    _trace_ctx_start = ABSOLUTE(.);
+    *(.trace_ctx)
+    _trace_ctx_end = ABSOLUTE(.);
     _data_end = ABSOLUTE(.);
   } >sof_fw :sof_fw_phdr