mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
8299d1f057
Rebased RPi foundation patches on linux 5.10.59, removed applied and reverted patches, wireless patches and defconfig patches. bcm2708: boot tested on RPi B+ v1.2 bcm2709: boot tested on RPi 4B v1.1 4G bcm2711: boot tested on RPi 4B v1.1 4G Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
123 lines
4.1 KiB
Diff
123 lines
4.1 KiB
Diff
From afbc6c9f890bd3d877451138b2ffd5bd19bfdf61 Mon Sep 17 00:00:00 2001
|
|
From: detule <ogjoneski@gmail.com>
|
|
Date: Tue, 2 Oct 2018 04:10:08 -0400
|
|
Subject: [PATCH] vchiq_2835_arm: Implement a DMA pool for small bulk
|
|
transfers (#2699)
|
|
|
|
During a bulk transfer we request a DMA allocation to hold the
|
|
scatter-gather list. Most of the time, this allocation is small
|
|
(<< PAGE_SIZE), however it can be requested at a high enough frequency
|
|
to cause fragmentation and/or stress the CMA allocator (think time
|
|
spent in compaction here, or during allocations elsewhere).
|
|
|
|
Implement a pool to serve up small DMA allocations, falling back
|
|
to a coherent allocation if the request is greater than
|
|
VCHIQ_DMA_POOL_SIZE.
|
|
|
|
Signed-off-by: Oliver Gjoneski <ogjoneski@gmail.com>
|
|
---
|
|
.../interface/vchiq_arm/vchiq_2835_arm.c | 36 ++++++++++++++++---
|
|
1 file changed, 32 insertions(+), 4 deletions(-)
|
|
|
|
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
|
|
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
|
|
@@ -7,6 +7,7 @@
|
|
#include <linux/interrupt.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/dma-mapping.h>
|
|
+#include <linux/dmapool.h>
|
|
#include <linux/io.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/uaccess.h>
|
|
@@ -29,6 +30,8 @@
|
|
#define BELL0 0x00
|
|
#define BELL2 0x08
|
|
|
|
+#define VCHIQ_DMA_POOL_SIZE PAGE_SIZE
|
|
+
|
|
struct vchiq_2835_state {
|
|
int inited;
|
|
struct vchiq_arm_state arm_state;
|
|
@@ -38,6 +41,7 @@ struct vchiq_pagelist_info {
|
|
struct pagelist *pagelist;
|
|
size_t pagelist_buffer_size;
|
|
dma_addr_t dma_addr;
|
|
+ bool is_from_pool;
|
|
enum dma_data_direction dma_dir;
|
|
unsigned int num_pages;
|
|
unsigned int pages_need_release;
|
|
@@ -58,6 +62,7 @@ static void __iomem *g_regs;
|
|
* of 32.
|
|
*/
|
|
static unsigned int g_cache_line_size = 32;
|
|
+static struct dma_pool *g_dma_pool;
|
|
static unsigned int g_use_36bit_addrs = 0;
|
|
static unsigned int g_fragments_size;
|
|
static char *g_fragments_base;
|
|
@@ -182,6 +187,13 @@ int vchiq_platform_init(struct platform_
|
|
|
|
g_dev = dev;
|
|
g_dma_dev = dma_dev ?: dev;
|
|
+ g_dma_pool = dmam_pool_create("vchiq_scatter_pool", dev,
|
|
+ VCHIQ_DMA_POOL_SIZE, g_cache_line_size,
|
|
+ 0);
|
|
+ if (!g_dma_pool) {
|
|
+ dev_err(dev, "failed to create dma pool");
|
|
+ return -ENOMEM;
|
|
+ }
|
|
|
|
vchiq_log_info(vchiq_arm_log_level,
|
|
"vchiq_init - done (slots %pK, phys %pad)",
|
|
@@ -314,8 +326,14 @@ cleanup_pagelistinfo(struct vchiq_pageli
|
|
if (pagelistinfo->pages_need_release)
|
|
unpin_user_pages(pagelistinfo->pages, pagelistinfo->num_pages);
|
|
|
|
- dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size,
|
|
- pagelistinfo->pagelist, pagelistinfo->dma_addr);
|
|
+ if (pagelistinfo->is_from_pool) {
|
|
+ dma_pool_free(g_dma_pool, pagelistinfo->pagelist,
|
|
+ pagelistinfo->dma_addr);
|
|
+ } else {
|
|
+ dma_free_coherent(g_dev, pagelistinfo->pagelist_buffer_size,
|
|
+ pagelistinfo->pagelist,
|
|
+ pagelistinfo->dma_addr);
|
|
+ }
|
|
}
|
|
|
|
/* There is a potential problem with partial cache lines (pages?)
|
|
@@ -336,6 +354,7 @@ create_pagelist(char *buf, char __user *
|
|
u32 *addrs;
|
|
unsigned int num_pages, offset, i, k;
|
|
int actual_pages;
|
|
+ bool is_from_pool;
|
|
size_t pagelist_size;
|
|
struct scatterlist *scatterlist, *sg;
|
|
int dma_buffers;
|
|
@@ -365,8 +384,16 @@ create_pagelist(char *buf, char __user *
|
|
/* Allocate enough storage to hold the page pointers and the page
|
|
* list
|
|
*/
|
|
- pagelist = dma_alloc_coherent(g_dev, pagelist_size, &dma_addr,
|
|
- GFP_KERNEL);
|
|
+ if (pagelist_size > VCHIQ_DMA_POOL_SIZE) {
|
|
+ pagelist = dma_alloc_coherent(g_dev,
|
|
+ pagelist_size,
|
|
+ &dma_addr,
|
|
+ GFP_KERNEL);
|
|
+ is_from_pool = false;
|
|
+ } else {
|
|
+ pagelist = dma_pool_alloc(g_dma_pool, GFP_KERNEL, &dma_addr);
|
|
+ is_from_pool = true;
|
|
+ }
|
|
|
|
vchiq_log_trace(vchiq_arm_log_level, "%s - %pK", __func__, pagelist);
|
|
|
|
@@ -387,6 +414,7 @@ create_pagelist(char *buf, char __user *
|
|
pagelistinfo->pagelist = pagelist;
|
|
pagelistinfo->pagelist_buffer_size = pagelist_size;
|
|
pagelistinfo->dma_addr = dma_addr;
|
|
+ pagelistinfo->is_from_pool = is_from_pool;
|
|
pagelistinfo->dma_dir = (type == PAGELIST_WRITE) ?
|
|
DMA_TO_DEVICE : DMA_FROM_DEVICE;
|
|
pagelistinfo->num_pages = num_pages;
|