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panfrost: Add BO cache data structure 

Linked list of panfrost_bo* nested inside an array of buckets.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-07-15 08:36:19 -07:00
parent f3464f7987
commit 270733fe6a
3 changed files with 24 additions and 0 deletions
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5
src/gallium/drivers/panfrost/pan_allocate.h
View File

@ -31,6 +31,8 @@
#include <panfrost-misc.h>
#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) */

3
src/gallium/drivers/panfrost/pan_screen.c
View File

@ -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();

16
src/gallium/drivers/panfrost/pan_screen.h
View File

@ -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 */