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, will@kernel.org,
nsaenzjulienne@suse.de, linux-kernel@vger.kernel.org,
eric@anholt.net, mbrugger@suse.com,
linux-rpi-kernel@lists.infradead.org, akpm@linux-foundation.org,
frowand.list@gmail.com, m.szyprowski@samsung.com
Subject: [PATCH v2 01/11] asm-generic: add dma_zone_size
Date: Tue, 20 Aug 2019 16:58:09 +0200 [thread overview]
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
next prev parent reply other threads:[~2019-08-20 14:58 UTC|newest]
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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