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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,
	Arnd Bergmann <arnd@arndb.de>
Cc: phill@raspberryi.org, f.fainelli@gmail.com,
	frowand.list@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 01/11] asm-generic: add dma_zone_size
Date: Tue, 20 Aug 2019 16:58:09 +0200
Message-ID: <20190820145821.27214-2-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20190820145821.27214-1-nsaenzjulienne@suse.de>

Some architectures have platform specific DMA addressing limitations.
This will allow for hardware description code to provide the constraints
in a generic manner, so as for arch code to properly setup it's memory
zones and DMA mask.

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

Changes in v2: None

 include/asm-generic/dma.h | 8 +++++++-
 mm/page_alloc.c           | 3 +++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/dma.h b/include/asm-generic/dma.h
index 43d0c8af8058..c2f39cdb64f6 100644
--- a/include/asm-generic/dma.h
+++ b/include/asm-generic/dma.h
@@ -8,7 +8,13 @@
  *
  * Some code relies on seeing MAX_DMA_ADDRESS though.
  */
-#define MAX_DMA_ADDRESS PAGE_OFFSET
+#define MAX_DMA_ADDRESS	 (PAGE_OFFSET + dma_zone_size)
+
+/*
+ * Some architectures may have platform specific DMA addressing constraints.
+ * Firmware can use this to fine tune the device's DMA memory zone.
+ */
+extern u64 dma_zone_size __ro_after_init;
 
 extern int request_dma(unsigned int dmanr, const char *device_id);
 extern void free_dma(unsigned int dmanr);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 272c6de1bf4e..b514afee5451 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -133,6 +133,9 @@ EXPORT_SYMBOL(_totalram_pages);
 unsigned long totalreserve_pages __read_mostly;
 unsigned long totalcma_pages __read_mostly;
 
+u64 dma_zone_size __ro_after_init;
+EXPORT_SYMBOL(dma_zone_size);
+
 int percpu_pagelist_fraction;
 gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
 #ifdef CONFIG_INIT_ON_ALLOC_DEFAULT_ON
-- 
2.22.0

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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 ` Nicolas Saenz Julienne [this message]
2019-08-26  7:09   ` [PATCH v2 01/11] asm-generic: add dma_zone_size 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 ` [PATCH v2 04/11] of/fdt: add early_init_dt_get_dma_zone_size() Nicolas Saenz Julienne
2019-08-20 17:14   ` 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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