lima: add debug prints for BO cache

LIMA_DEBUG=bocache now activates debug prints for BO allocation,
destruction and BO cache.

Reviewed-by: Erico Nunes <[email protected]>
Signed-off-by: Vasily Khoruzhick <[email protected]>

3 files changed, 56 insertions, 6 deletions

diff --git a/src/gallium/drivers/lima/lima_bo.c b/src/gallium/drivers/lima/lima_bo.c
index 22263ea0054..f0015396217 100644
--- a/src/gallium/drivers/lima/lima_bo.c
+++ b/src/gallium/drivers/lima/lima_bo.c
@@ -107,6 +107,11 @@ static void
 lima_bo_free(struct lima_bo *bo)
 {
    struct lima_screen *screen = bo->screen;
+
+   if (lima_debug & LIMA_DEBUG_BO_CACHE)
+      fprintf(stderr, "%s: %p (size=%d)\n", __func__,
+              bo, bo->size);
+
    mtx_lock(&screen->bo_table_lock);
    util_hash_table_remove(screen->bo_handles,
                           (void *)(uintptr_t)bo->handle);
@@ -172,15 +177,39 @@ lima_bo_cache_get_bucket(struct lima_screen *screen, unsigned size)
 static void
 lima_bo_cache_free_stale_bos(struct lima_screen *screen, time_t time)
 {
+   unsigned cnt = 0;
    list_for_each_entry_safe(struct lima_bo, entry,
                             &screen->bo_cache_time, time_list) {
       /* Free BOs that are sitting idle for longer than 5 seconds */
       if (time - entry->free_time > 6) {
          lima_bo_cache_remove(entry);
          lima_bo_free(entry);
+         cnt++;
       } else
          break;
    }
+   if ((lima_debug & LIMA_DEBUG_BO_CACHE) && cnt)
+      fprintf(stderr, "%s: freed %d stale BOs\n", __func__, cnt);
+}
+
+static void
+lima_bo_cache_print_stats(struct lima_screen *screen)
+{
+   fprintf(stderr, "===============\n");
+   fprintf(stderr, "BO cache stats:\n");
+   unsigned total_size = 0;
+   for (int i = 0; i < NR_BO_CACHE_BUCKETS; i++) {
+      struct list_head *bucket = &screen->bo_cache_buckets[i];
+      unsigned bucket_size = 0;
+      list_for_each_entry(struct lima_bo, entry, bucket, size_list) {
+         bucket_size += entry->size;
+         total_size += entry->size;
+      }
+      fprintf(stderr, "Bucket #%d, BOs: %d, size: %u\n", i,
+              list_length(bucket),
+              bucket_size);
+   }
+   fprintf(stderr, "Total size: %u\n", total_size);
 }
 
 static bool
@@ -205,6 +234,10 @@ lima_bo_cache_put(struct lima_bo *bo)
    list_addtail(&bo->size_list, bucket);
    list_addtail(&bo->time_list, &screen->bo_cache_time);
    lima_bo_cache_free_stale_bos(screen, time.tv_sec);
+   if (lima_debug & LIMA_DEBUG_BO_CACHE) {
+      fprintf(stderr, "%s: put BO: %p (size=%d)\n", __func__, bo, bo->size);
+      lima_bo_cache_print_stats(screen);
+   }
    mtx_unlock(&screen->bo_cache_lock);
 
    return true;
@@ -226,12 +259,22 @@ lima_bo_cache_get(struct lima_screen *screen, uint32_t size, uint32_t flags)
       if (entry->size >= size &&
           entry->flags == flags) {
          /* Check if BO is idle. If it's not it's better to allocate new one */
-         if (!lima_bo_wait(entry, LIMA_GEM_WAIT_WRITE, 0))
+         if (!lima_bo_wait(entry, LIMA_GEM_WAIT_WRITE, 0)) {
+            if (lima_debug & LIMA_DEBUG_BO_CACHE) {
+               fprintf(stderr, "%s: found BO %p but it's busy\n", __func__,
+                       entry);
+            }
             break;
+         }
 
          lima_bo_cache_remove(entry);
          p_atomic_set(&entry->refcnt, 1);
          bo = entry;
+         if (lima_debug & LIMA_DEBUG_BO_CACHE) {
+            fprintf(stderr, "%s: got BO: %p (size=%d), requested size %d\n",
+                    __func__, bo, bo->size, size);
+            lima_bo_cache_print_stats(screen);
+         }
          break;
       }
    }
@@ -277,6 +320,10 @@ struct lima_bo *lima_bo_create(struct lima_screen *screen,
    if (!lima_bo_get_info(bo))
       goto err_out1;
 
+   if (lima_debug & LIMA_DEBUG_BO_CACHE)
+      fprintf(stderr, "%s: %p (size=%d)\n", __func__,
+              bo, bo->size);
+
    return bo;
 
 err_out1:
diff --git a/src/gallium/drivers/lima/lima_screen.c b/src/gallium/drivers/lima/lima_screen.c
index 30b199e777f..d8f5c3b4fd9 100644
--- a/src/gallium/drivers/lima/lima_screen.c
+++ b/src/gallium/drivers/lima/lima_screen.c
@@ -431,6 +431,8 @@ static const struct debug_named_value debug_options[] = {
           "print shader information for shaderdb" },
         { "nobocache", LIMA_DEBUG_NO_BO_CACHE,
           "disable BO cache" },
+        { "bocache", LIMA_DEBUG_BO_CACHE,
+          "print debug info for BO cache" },
         { NULL }
 };
 
diff --git a/src/gallium/drivers/lima/lima_screen.h b/src/gallium/drivers/lima/lima_screen.h
index 62fa480738c..144f5a2e163 100644
--- a/src/gallium/drivers/lima/lima_screen.h
+++ b/src/gallium/drivers/lima/lima_screen.h
@@ -33,11 +33,12 @@
 
 #include "pipe/p_screen.h"
 
-#define LIMA_DEBUG_GP      (1 << 0)
-#define LIMA_DEBUG_PP      (1 << 1)
-#define LIMA_DEBUG_DUMP    (1 << 2)
-#define LIMA_DEBUG_SHADERDB (1 << 3)
-#define LIMA_DEBUG_NO_BO_CACHE (1 << 4)
+#define LIMA_DEBUG_GP             (1 << 0)
+#define LIMA_DEBUG_PP             (1 << 1)
+#define LIMA_DEBUG_DUMP           (1 << 2)
+#define LIMA_DEBUG_SHADERDB       (1 << 3)
+#define LIMA_DEBUG_NO_BO_CACHE    (1 << 4)
+#define LIMA_DEBUG_BO_CACHE       (1 << 5)
 
 extern uint32_t lima_debug;
 extern FILE *lima_dump_command_stream;