linux-kernel - [PATCH 4/6] arm: add arch_sync_dma_for

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Date:   Wed, 14 Aug 2019 14:59:59 -0700
From:   Rob Clark <robdclark@...il.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Christoph Hellwig <hch@....de>, Rob Clark <robdclark@...omium.org>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Paul Burton <paul.burton@...s.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Doug Anderson <armlinux@...isordat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Wolfram Sang <wsa@...-dreams.de>,
        Souptick Joarder <jrdr.linux@...il.com>,
        "Wolfram Sang (Renesas)" <wsa+renesas@...g-engineering.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] arm: add arch_sync_dma_for_*()

From: Rob Clark <robdclark@...omium.org>

Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 arch/arm/Kconfig                |  2 ++
 arch/arm/mm/dma-mapping-nommu.c | 14 ++++++++++++++
 arch/arm/mm/dma-mapping.c       | 28 ++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 33b00579beff..a48a7263a2c1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -18,6 +18,8 @@ config ARM
 	select ARCH_HAS_SET_MEMORY
 	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
 	select ARCH_HAS_STRICT_MODULE_RWX if MMU
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select ARCH_HAS_SYNC_DMA_FOR_CPU
 	select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAVE_CUSTOM_GPIO_H
diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index 52b82559d99b..4a3df952151f 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c
@@ -84,6 +84,13 @@ static void __dma_page_cpu_to_dev(phys_addr_t paddr, size_t size,
 		outer_clean_range(paddr, paddr + size);
 }
 
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_cpu_to_dev(paddr, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_device);
+
 static void __dma_page_dev_to_cpu(phys_addr_t paddr, size_t size,
 				  enum dma_data_direction dir)
 {
@@ -93,6 +100,13 @@ static void __dma_page_dev_to_cpu(phys_addr_t paddr, size_t size,
 	}
 }
 
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_dev_to_cpu(paddr, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_cpu);
+
 static dma_addr_t arm_nommu_dma_map_page(struct device *dev, struct page *page,
 					 unsigned long offset, size_t size,
 					 enum dma_data_direction dir,
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 6774b03aa405..8ead93196194 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -979,6 +979,13 @@ static void __dma_page_cpu_to_dev(struct page *page, unsigned long off,
 	/* FIXME: non-speculating: flush on bidirectional mappings? */
 }
 
+void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_cpu_to_dev(phys_to_page(paddr), paddr % PAGE_SIZE, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_device);
+
 static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
 	size_t size, enum dma_data_direction dir)
 {
@@ -1013,6 +1020,27 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
 	}
 }
 
+void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
+		size_t size, enum dma_data_direction dir)
+{
+	__dma_page_dev_to_cpu(phys_to_page(paddr), paddr % PAGE_SIZE, size, dir);
+}
+EXPORT_SYMBOL_GPL(arch_sync_dma_for_cpu);
+
+/*
+ * arch_dma_{alloc,free} fail-stubs needed to avoid link-errors in dma/direct.c
+ * (which is not actually used on arch/arm)
+ */
+void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
+		gfp_t flags, unsigned long attrs)
+{
+	return NULL;
+}
+void arch_dma_free(struct device *dev, size_t size, void *vaddr,
+		dma_addr_t dma_handle, unsigned long attrs)
+{
+}
+
 /**
  * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA
  * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
-- 
2.21.0