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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: catalin.marinas@arm.com, hch@lst.de, wahrenst@gmx.net,
	marc.zyngier@arm.com, robh+dt@kernel.org,
	Robin Murphy <robin.murphy@arm.com>,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	linux-arch@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-mm@kvack.org, linux-riscv@lists.infradead.org,
	Frank Rowand <frowand.list@gmail.com>
Cc: phill@raspberryi.org, f.fainelli@gmail.com,
	linux-kernel@vger.kernel.org, eric@anholt.net, mbrugger@suse.com,
	linux-rpi-kernel@lists.infradead.org, akpm@linux-foundation.org,
	will@kernel.org, nsaenzjulienne@suse.de
Subject: [PATCH v2 04/11] of/fdt: add early_init_dt_get_dma_zone_size()
Date: Tue, 20 Aug 2019 16:58:12 +0200
Message-ID: <20190820145821.27214-5-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20190820145821.27214-1-nsaenzjulienne@suse.de>

Some devices might have weird DMA addressing limitations that only apply
to a subset of the available peripherals. For example the Raspberry Pi 4
has two interconnects, one able to address the whole lower 4G memory
area and another one limited to the lower 1G.

Being an uncommon situation we simply hardcode the device wide DMA
addressable memory size conditionally to the machine compatible name and
set 'dma_zone_size' accordingly.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>

---

Changes in v2:
- New approach to getting dma_zone_size, instead of parsing the dts we
  hardcode it conditionally to the machine compatible name.

 drivers/of/fdt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 06ffbd39d9af..f756e8c05a77 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -27,6 +27,7 @@
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #include <asm/page.h>
+#include <asm/dma.h>	/* for dma_zone_size */
 
 #include "of_private.h"
 
@@ -1195,6 +1196,12 @@ void __init early_init_dt_scan_nodes(void)
 	of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 }
 
+void __init early_init_dt_get_dma_zone_size(void)
+{
+	if (of_fdt_machine_is_compatible("brcm,bcm2711"))
+		dma_zone_size = 0x3c000000;
+}
+
 bool __init early_init_dt_scan(void *params)
 {
 	bool status;
@@ -1204,6 +1211,7 @@ bool __init early_init_dt_scan(void *params)
 		return false;
 
 	early_init_dt_scan_nodes();
+	early_init_dt_get_dma_zone_size();
 	return true;
 }
 
-- 
2.22.0

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  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20 14:58 [PATCH v2 00/11] Raspberry Pi 4 DMA addressing support Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 01/11] asm-generic: add dma_zone_size Nicolas Saenz Julienne
2019-08-26  7:09   ` Christoph Hellwig
2019-08-26 13:46     ` Nicolas Saenz Julienne
2019-08-28  9:44       ` Nicolas Saenz Julienne
2019-08-30 14:45       ` Catalin Marinas
2019-08-30 17:24         ` Nicolas Saenz Julienne
2019-09-02 13:01           ` Christoph Hellwig
2019-08-20 14:58 ` [PATCH v2 02/11] arm: use generic dma_zone_size Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 03/11] of/fdt: add of_fdt_machine_is_compatible function Nicolas Saenz Julienne
2019-08-20 17:16   ` Rob Herring
2019-08-20 17:27     ` Nicolas Saenz Julienne
2019-08-20 14:58 ` Nicolas Saenz Julienne [this message]
2019-08-20 17:14   ` [PATCH v2 04/11] of/fdt: add early_init_dt_get_dma_zone_size() Rob Herring
2019-08-20 14:58 ` [PATCH v2 05/11] arm64: mm: use arm64_dma_phys_limit instead of calling max_zone_dma_phys() Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 06/11] arm64: rename variables used to calculate ZONE_DMA32's size Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 07/11] arm64: re-introduce max_zone_dma_phys() Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 08/11] arm64: use both ZONE_DMA and ZONE_DMA32 Nicolas Saenz Julienne
2019-08-20 14:58 ` [PATCH v2 09/11] dma-direct: turn ARCH_ZONE_DMA_BITS into a variable Nicolas Saenz Julienne
2019-08-26  7:05   ` Christoph Hellwig
2019-08-26 11:33   ` Michael Ellerman
2019-08-20 14:58 ` [PATCH v2 10/11] arm64: edit zone_dma_bits to fine tune dma-direct min mask Nicolas Saenz Julienne
2019-08-26  7:06   ` Christoph Hellwig
2019-08-26 11:08     ` Nicolas Saenz Julienne
2019-08-27  7:03       ` Petr Tesarik
2019-08-20 14:58 ` [PATCH v2 11/11] mm: refresh ZONE_DMA and ZONE_DMA32 comments in 'enum zone_type' Nicolas Saenz Julienne
2019-08-26  7:07   ` Christoph Hellwig

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