soc: intel_adsp: tools: cavstool.py: Add debug_slot_offset_by_type()

Add debug_slot_offset_by_type() for getting debug window slot offset
by type identifier. How to find the correct slot and what types there
are is documented here:

soc/intel/intel_adsp/common/include/adsp_debug_window.h

In a normal situation a client program would try to find a specific
slot right after DSP boot. Because of that the we can not expect it to
be there immediately. Instead we need to try multiple times and give
firmware some time to update the debug slot descriptor table.

Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>

Author: Jyri Sarha

soc/intel/intel_adsp/tools/cavstool.py

@@ -748,6 +748,26 @@ def debug_offset():
 def debug_slot_offset(num):
     return debug_offset() + DEBUG_SLOT_SIZE * (1 + num)
 
+def debug_slot_offset_by_type(the_type, timeout_s=0.2):
+    ADSP_DW_SLOT_COUNT=15
+    hertz = 100
+    attempts = timeout_s * hertz
+    while attempts > 0:
+        data = win_read(debug_offset(), 0, ADSP_DW_SLOT_COUNT * 3 * 4)
+        for i in range(ADSP_DW_SLOT_COUNT):
+            start_index = i * (3 * 4)
+            end_index = (i + 1) * (3 * 4)
+            desc = data[start_index:end_index]
+            resource_id, type_id, vma = struct.unpack('<III', desc)
+            if type_id == the_type:
+                log.info("found desc %u resource_id 0x%08x type_id 0x%08x vma 0x%08x",
+                         i, resource_id, type_id, vma)
+                return debug_slot_offset(i)
+        log.debug("not found, %u attempts left", attempts)
+        attempts -= 1
+        time.sleep(1 / hertz)
+    return None
+
 def shell_base_offset():
     return debug_offset() + DEBUG_SLOT_SIZE * (1 + DEBUG_SLOT_SHELL)