From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: robh+dt@kernel.org, catalin.marinas@arm.com, hch@lst.de,
ardb@kernel.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Cc: robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org,
linux-rpi-kernel@lists.infradead.org, jeremy.linton@arm.com,
iommu@lists.linux-foundation.org, devicetree@vger.kernel.org,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
linux-mm@kvack.org
Subject: [PATCH v2 5/5] mm: Update DMA zones description
Date: Sat, 10 Oct 2020 17:12:35 +0200 [thread overview]
Message-ID: <20201010151235.20585-6-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20201010151235.20585-1-nsaenzjulienne@suse.de>
The default behavior for arm64 changed, so reflect that.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
include/linux/mmzone.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index fb3bf696c05e..4ee2306351b9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -363,8 +363,9 @@ enum zone_type {
* - arm only uses ZONE_DMA, the size, up to 4G, may vary depending on
* the specific device.
*
- * - arm64 has a fixed 1G ZONE_DMA and ZONE_DMA32 for the rest of the
- * lower 4G.
+ * - arm64 uses a single 4GB ZONE_DMA, except on the Raspberry Pi 4,
+ * in which ZONE_DMA covers the first GB and ZONE_DMA32 the rest of
+ * the lower 4GB.
*
* - powerpc only uses ZONE_DMA, the size, up to 2G, may vary
* depending on the specific device.
--
2.28.0
prev parent reply other threads:[~2020-10-10 22:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-10 15:12 [PATCH v2 0/5] arm64: Default to 32-bit wide ZONE_DMA Nicolas Saenz Julienne
2020-10-10 15:12 ` [PATCH v2 1/5] arm64: mm: Move zone_dma_bits initialization into zone_sizes_init() Nicolas Saenz Julienne
2020-10-12 11:37 ` Catalin Marinas
2020-10-12 14:23 ` Ard Biesheuvel
2020-10-10 15:12 ` [PATCH v2 2/5] of/address: Introduce of_dma_lower_bus_limit() Nicolas Saenz Julienne
2020-10-11 7:47 ` Ard Biesheuvel
2020-10-14 11:34 ` Nicolas Saenz Julienne
2020-10-12 15:25 ` Rob Herring
2020-10-14 11:52 ` Nicolas Saenz Julienne
2020-10-14 12:23 ` Rob Herring
2020-10-10 15:12 ` [PATCH v2 3/5] dma-direct: Turn zone_dma_bits default value into a define Nicolas Saenz Julienne
2020-10-10 15:12 ` [PATCH v2 4/5] arm64: mm: Dynamically resize zone_dma_bits based on system's constraints Nicolas Saenz Julienne
2020-10-10 15:12 ` Nicolas Saenz Julienne [this message]
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