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rockchip: adjust default DMA coherent_pool to 2MiB
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...et/linux/rockchip/patches-5.19/0911-kernel-dma-adjust-default-coherent_pool-to-2MiB.patch
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Original file line number | Diff line number | Diff line change |
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From 16bdf3e76fec6ddb44f1fcf221139fb39d225031 Mon Sep 17 00:00:00 2001 | ||
From: Igor Pecovnik <igor.pecovnik@gmail.com> | ||
Date: Sat, 2 Jan 2021 05:23:55 +0000 | ||
Subject: [PATCH] kernel: dma: adjust default coherent_pool to 2MiB | ||
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--- | ||
kernel/dma/pool.c | 8 +++----- | ||
1 file changed, 3 insertions(+), 5 deletions(-) | ||
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--- a/kernel/dma/pool.c | ||
+++ b/kernel/dma/pool.c | ||
@@ -189,13 +189,11 @@ static int __init dma_atomic_pool_init(v | ||
int ret = 0; | ||
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/* | ||
- * If coherent_pool was not used on the command line, default the pool | ||
- * sizes to 128KB per 1GB of memory, min 128KB, max MAX_ORDER-1. | ||
+ * Always use 2MiB as default pool size. | ||
+ * See: https://forum.armbian.com/topic/4811-uas-mainline-kernel-coherent-pool-memory-size/ | ||
*/ | ||
if (!atomic_pool_size) { | ||
- unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K); | ||
- pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES); | ||
- atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K); | ||
+ atomic_pool_size = SZ_2M; | ||
} | ||
INIT_WORK(&atomic_pool_work, atomic_pool_work_fn); | ||
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