mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
4089df4f4b
Refreshed all patches. This bump contains upstream commits which seem to avoid (not properly fix) the errors as seen in FS#2305 and FS#2297 Altered patches: - 403-net-mvneta-convert-to-phylink.patch - 410-sfp-hack-allow-marvell-10G-phy-support-to-use-SFP.patch Compile-tested on: ar71xx, cns3xxx, imx6, mvebu, x86_64 Runtime-tested on: ar71xx, cns3xxx, imx6, x86_64 Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
127 lines
4.1 KiB
Diff
127 lines
4.1 KiB
Diff
From 88acd92a7cbcb8a6ae299b88554abbc9bedbae0a Mon Sep 17 00:00:00 2001
|
|
From: detule <ogjoneski@gmail.com>
|
|
Date: Tue, 2 Oct 2018 04:10:08 -0400
|
|
Subject: [PATCH 424/454] 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 | 40 +++++++++++++++----
|
|
1 file changed, 33 insertions(+), 7 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
|
|
@@ -37,6 +37,7 @@
|
|
#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>
|
|
@@ -59,6 +60,8 @@
|
|
#define BELL0 0x00
|
|
#define BELL2 0x08
|
|
|
|
+#define VCHIQ_DMA_POOL_SIZE PAGE_SIZE
|
|
+
|
|
typedef struct vchiq_2835_state_struct {
|
|
int inited;
|
|
VCHIQ_ARM_STATE_T arm_state;
|
|
@@ -68,6 +71,7 @@ struct vchiq_pagelist_info {
|
|
PAGELIST_T *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;
|
|
@@ -78,6 +82,7 @@ struct vchiq_pagelist_info {
|
|
|
|
static void __iomem *g_regs;
|
|
static unsigned int g_cache_line_size = sizeof(CACHE_LINE_SIZE);
|
|
+static struct dma_pool *g_dma_pool;
|
|
static unsigned int g_fragments_size;
|
|
static char *g_fragments_base;
|
|
static char *g_free_fragments;
|
|
@@ -193,6 +198,14 @@ int vchiq_platform_init(struct platform_
|
|
}
|
|
|
|
g_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)",
|
|
vchiq_slot_zero, &slot_phys);
|
|
@@ -377,9 +390,14 @@ cleanup_pagelistinfo(struct vchiq_pageli
|
|
for (i = 0; i < pagelistinfo->num_pages; i++)
|
|
put_page(pagelistinfo->pages[i]);
|
|
}
|
|
-
|
|
- 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?)
|
|
@@ -400,6 +418,7 @@ create_pagelist(char __user *buf, size_t
|
|
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;
|
|
@@ -426,10 +445,16 @@ create_pagelist(char __user *buf, size_t
|
|
/* Allocate enough storage to hold the page pointers and the page
|
|
** list
|
|
*/
|
|
- pagelist = dma_zalloc_coherent(g_dev,
|
|
- pagelist_size,
|
|
- &dma_addr,
|
|
- GFP_KERNEL);
|
|
+ if (pagelist_size > VCHIQ_DMA_POOL_SIZE) {
|
|
+ pagelist = dma_zalloc_coherent(g_dev,
|
|
+ pagelist_size,
|
|
+ &dma_addr,
|
|
+ GFP_KERNEL);
|
|
+ is_from_pool = false;
|
|
+ } else {
|
|
+ pagelist = dma_pool_zalloc(g_dma_pool, GFP_KERNEL, &dma_addr);
|
|
+ is_from_pool = true;
|
|
+ }
|
|
|
|
vchiq_log_trace(vchiq_arm_log_level, "create_pagelist - %pK",
|
|
pagelist);
|
|
@@ -450,6 +475,7 @@ create_pagelist(char __user *buf, size_t
|
|
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;
|