intel/mda: Add MDA_FILTER to select which archives to generate

Matches if names contains the filter value, multiple values separated by
commas.

Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29146>

docs/envvars.rst

@@ -896,6 +896,11 @@ Intel driver environment variables
    Prefix added to the mda.tar filenames generated when using INTEL_DEBUG=mda.
    If set to ``timestamp`` it will generate the current time/date as prefix.
 
+.. envvar:: MDA_FILTER
+
+   When set, will only generate mda.tar files which names contain any of the
+   comma-separated filter values as substrings.
+
 Anvil(ANV) driver environment variables
 ---------------------------------------
 

src/gallium/drivers/iris/iris_program.c

@@ -1858,8 +1858,10 @@ iris_debug_archiver_open(void *tmp_ctx, struct iris_screen *screen,
    debug_archiver *debug_archiver =
       debug_archiver_open(tmp_ctx, name, PACKAGE_VERSION MESA_GIT_SHA1);
 
-   debug_archiver_set_prefix(debug_archiver,
-                             _mesa_shader_stage_to_abbrev(ish->nir->info.stage));
+   if (debug_archiver) {
+      debug_archiver_set_prefix(debug_archiver,
+                                _mesa_shader_stage_to_abbrev(ish->nir->info.stage));
+   }
    return debug_archiver;
 }
 

src/intel/mda/debug_archiver.c

@@ -5,6 +5,7 @@
 
 #include "debug_archiver.h"
 
+#include "slice.h"
 #include "tar.h"
 #include "util/ralloc.h"
 #include "util/u_debug.h"
@@ -26,6 +27,7 @@ struct debug_archiver
 
 DEBUG_GET_ONCE_OPTION(mda_output_dir, "MDA_OUTPUT_DIR", ".")
 DEBUG_GET_ONCE_OPTION(mda_prefix, "MDA_PREFIX", NULL)
+DEBUG_GET_ONCE_OPTION(mda_filter, "MDA_FILTER", NULL)
 
 static bool
 ensure_output_dir(const char *dir)
@@ -40,9 +42,38 @@ ensure_output_dir(const char *dir)
    return mkdir(dir, 0755) == 0;
 }
 
+static bool
+debug_archiver_should_create(const char *name_str)
+{
+   const char *filter_str = debug_get_option_mda_filter();
+   if (filter_str && *filter_str) {
+      slice filter = slice_from_cstr(filter_str);
+      slice name = slice_from_cstr(name_str);
+
+      while (!slice_is_empty(filter)) {
+         slice_cut_result cut = slice_cut(filter, ',');
+         slice pattern = cut.before;
+
+         if (!slice_is_empty(pattern) &&
+             slice_contains_str(name, pattern))
+            return true;
+
+         filter = cut.after;
+      }
+
+      /* MDA_FILTER exist but did not match, don't create. */
+      return false;
+   }
+
+   return true;
+}
+
 debug_archiver *
 debug_archiver_open(void *mem_ctx, const char *name, const char *info)
 {
+   if (!debug_archiver_should_create(name))
+      return NULL;
+
    debug_archiver *da = rzalloc(mem_ctx, debug_archiver);
 
    char *filename = ralloc_asprintf(mem_ctx, "%s.mda.tar", name);
@@ -117,6 +148,9 @@ debug_archiver_open(void *mem_ctx, const char *name, const char *info)
 void
 debug_archiver_set_prefix(debug_archiver *da, const char *prefix)
 {
+   if (!da)
+      return;
+
    if (!prefix || !*prefix) {
       snprintf(da->prefix, ARRAY_SIZE(da->prefix) - 1, "%s", da->mda_dir_in_archive);
    } else {

src/intel/vulkan/anv_shader_compile.c

@@ -1690,8 +1690,10 @@ anv_debug_archiver_init(void *mem_ctx, struct anv_shader_data *shaders_data,
       shader_data->archiver =
          debug_archiver_open(mem_ctx, name, PACKAGE_VERSION MESA_GIT_SHA1);
 
-      debug_archiver_set_prefix(shader_data->archiver,
+      if (shader_data->archiver) {
+         debug_archiver_set_prefix(shader_data->archiver,
             _mesa_shader_stage_to_abbrev(info->stage));
+      }
    }
 }