From 270733fe6af0a726797259f6205c2e6740351e02 Mon Sep 17 00:00:00 2001 From: Alyssa Rosenzweig Date: Mon, 15 Jul 2019 08:36:19 -0700 Subject: [PATCH] panfrost: Add BO cache data structure Linked list of panfrost_bo* nested inside an array of buckets. Signed-off-by: Alyssa Rosenzweig --- src/gallium/drivers/panfrost/pan_allocate.h | 5 +++++ src/gallium/drivers/panfrost/pan_screen.c | 3 +++ src/gallium/drivers/panfrost/pan_screen.h | 16 ++++++++++++++++ 3 files changed, 24 insertions(+) diff --git a/src/gallium/drivers/panfrost/pan_allocate.h b/src/gallium/drivers/panfrost/pan_allocate.h index 43f69b4aceb..8d925ee38a4 100644 --- a/src/gallium/drivers/panfrost/pan_allocate.h +++ b/src/gallium/drivers/panfrost/pan_allocate.h @@ -31,6 +31,8 @@ #include +#include "util/list.h" + struct panfrost_context; /* Represents a fat pointer for GPU-mapped memory, returned from the transient @@ -42,6 +44,9 @@ struct panfrost_transfer { }; struct panfrost_bo { + /* Must be first for casting */ + struct list_head link; + struct pipe_reference reference; /* Mapping for the entire object (all levels) */ diff --git a/src/gallium/drivers/panfrost/pan_screen.c b/src/gallium/drivers/panfrost/pan_screen.c index 48ffde0d7b1..43a26856f9b 100644 --- a/src/gallium/drivers/panfrost/pan_screen.c +++ b/src/gallium/drivers/panfrost/pan_screen.c @@ -536,6 +536,9 @@ panfrost_create_screen(int fd, struct renderonly *ro) util_dynarray_init(&screen->transient_bo, screen); + for (unsigned i = 0; i < ARRAY_SIZE(screen->bo_cache); ++i) + list_inithead(&screen->bo_cache[i]); + if (pan_debug & PAN_DBG_TRACE) pandecode_initialize(); diff --git a/src/gallium/drivers/panfrost/pan_screen.h b/src/gallium/drivers/panfrost/pan_screen.h index 18866db049e..3ea624c8855 100644 --- a/src/gallium/drivers/panfrost/pan_screen.h +++ b/src/gallium/drivers/panfrost/pan_screen.h @@ -81,6 +81,16 @@ struct panfrost_screen; #define MAX_TRANSIENT_SLABS (1024*1024 / TRANSIENT_SLAB_PAGES) +/* How many power-of-two levels in the BO cache do we want? 2^12 + * minimum chosen as it is the page size that all allocations are + * rounded to */ + +#define MIN_BO_CACHE_BUCKET (12) /* 2^12 = 4KB */ +#define MAX_BO_CACHE_BUCKET (22) /* 2^22 = 4MB */ + +/* Fencepost problem, hence the off-by-one */ +#define NR_BO_CACHE_BUCKETS (MAX_BO_CACHE_BUCKET - MIN_BO_CACHE_BUCKET + 1) + struct panfrost_screen { struct pipe_screen base; int fd; @@ -97,6 +107,12 @@ struct panfrost_screen { /* Set of free transient BOs */ BITSET_DECLARE(free_transient, MAX_TRANSIENT_SLABS); + /* The BO cache is a set of buckets with power-of-two sizes ranging + * from 2^12 (4096, the page size) to 2^(12 + MAX_BO_CACHE_BUCKETS). + * Each bucket is a linked list of free panfrost_bo objects. */ + + struct list_head bo_cache[NR_BO_CACHE_BUCKETS]; + /* While we're busy building up the job for frame N, the GPU is * still busy executing frame N-1. So hold a reference to * yesterjob */ -- 2.30.2