openwrt/target/linux/bcm27xx/patches-5.4/950-0121-vchiq_2835_arm-Implement-a-DMA-pool-for-small-bulk-t.patch

From c2acd59177043f78446357f560e5436b0318ceb6 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      | 38 ++++++++++++++++---
 1 file changed, 33 insertions(+), 5 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>
@@ -28,6 +29,8 @@
 #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;
@@ -37,6 +40,7 @@ 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;
@@ -57,6 +61,7 @@ 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_fragments_size;
 static char *g_fragments_base;
 static char *g_free_fragments;
@@ -161,6 +166,14 @@ 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);
@@ -339,9 +352,14 @@ 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?)
@@ -361,6 +379,7 @@ 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;
@@ -387,8 +406,16 @@ create_pagelist(char __user *buf, size_t
 	/* 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);
 
@@ -409,6 +436,7 @@ 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;