lima: implement BO cache

Allocating BOs is expensive, so we should avoid doing that by caching
freed BOs.

BO cache is modelled after one in v3d driver and works as follows:

- in lima_bo_create() check if we have matching BO in cache and return
  it if there's one, allocate new BO otherwise.
- in lima_bo_unreference() (renamed from lima_bo_free()): put BO in
  cache instead of freeing it and remove all stale BOs from cache

Reviewed-by: Qiang Yu <[email protected]>
Signed-off-by: Vasily Khoruzhick <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/gallium/drivers/lima/lima_screen.h b/src/gallium/drivers/lima/lima_screen.h
index 547d083ecd0..62fa480738c 100644
--- a/src/gallium/drivers/lima/lima_screen.h
+++ b/src/gallium/drivers/lima/lima_screen.h
@@ -37,6 +37,7 @@
 #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)
 
 extern uint32_t lima_debug;
 extern FILE *lima_dump_command_stream;
@@ -46,6 +47,11 @@ extern int lima_ppir_force_spilling;
 
 struct ra_regs;
 
+#define MIN_BO_CACHE_BUCKET (12) /* 2^12 = 4KB */
+#define MAX_BO_CACHE_BUCKET (22) /* 2^22 = 4MB */
+
+#define NR_BO_CACHE_BUCKETS (MAX_BO_CACHE_BUCKET - MIN_BO_CACHE_BUCKET + 1)
+
 struct lima_screen {
    struct pipe_screen base;
    struct renderonly *ro;
@@ -60,8 +66,11 @@ struct lima_screen {
 
    /* bo table */
    mtx_t bo_table_lock;
+   mtx_t bo_cache_lock;
    struct util_hash_table *bo_handles;
    struct util_hash_table *bo_flink_names;
+   struct list_head bo_cache_buckets[NR_BO_CACHE_BUCKETS];
+   struct list_head bo_cache_time;
 
    struct slab_parent_pool transfer_pool;