anv: Add a performance warning helper

This acts identically to anv_finishme except that it only dumps out
these nice log messages if you run with INTEL_DEBUG=perf.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_private.h

@@ -230,6 +230,8 @@ VkResult __vk_errorf(VkResult error, const char *file, int line, const char *for
 
 void __anv_finishme(const char *file, int line, const char *format, ...)
    anv_printflike(3, 4);
+void __anv_perf_warn(const char *file, int line, const char *format, ...)
+   anv_printflike(3, 4);
 void anv_loge(const char *format, ...) anv_printflike(1, 2);
 void anv_loge_v(const char *format, va_list va);
 
@@ -245,6 +247,18 @@ void anv_loge_v(const char *format, va_list va);
       } \
    } while (0)
 
+/**
+ * Print a perf warning message.  Set INTEL_DEBUG=perf to see these.
+ */
+#define anv_perf_warn(format, ...) \
+   do { \
+      static bool reported = false; \
+      if (!reported && unlikely(INTEL_DEBUG & DEBUG_PERF)) { \
+         __anv_perf_warn(__FILE__, __LINE__, format, ##__VA_ARGS__); \
+         reported = true; \
+      } \
+   } while (0)
+
 /* A non-fatal assert.  Useful for debugging. */
 #ifdef DEBUG
 #define anv_assert(x) ({ \

src/intel/vulkan/anv_util.c

@@ -64,6 +64,19 @@ __anv_finishme(const char *file, int line, const char *format, ...)
    fprintf(stderr, "%s:%d: FINISHME: %s\n", file, line, buffer);
 }
 
+void anv_printflike(3, 4)
+__anv_perf_warn(const char *file, int line, const char *format, ...)
+{
+   va_list ap;
+   char buffer[256];
+
+   va_start(ap, format);
+   vsnprintf(buffer, sizeof(buffer), format, ap);
+   va_end(ap);
+
+   fprintf(stderr, "%s:%d: PERF: %s\n", file, line, buffer);
+}
+
 VkResult
 __vk_errorf(VkResult error, const char *file, int line, const char *format, ...)
 {