From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 02/25] dma-mapping: add a Kconfig symbol to indicated arch_dma_prep_coherent presence
Date: Tue, 30 Apr 2019 06:51:51 -0400 [thread overview]
Message-ID: <20190430105214.24628-3-hch@lst.de> (raw)
In-Reply-To: <20190430105214.24628-1-hch@lst.de>
Add a Kconfig symbol that indicates an architecture provides a
arch_dma_prep_coherent implementation, and provide a stub otherwise.
This will allow the generic dma-iommu code to use it while still
allowing to be built for cache coherent architectures.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
---
arch/arm64/Kconfig | 1 +
arch/csky/Kconfig | 1 +
include/linux/dma-noncoherent.h | 6 ++++++
kernel/dma/Kconfig | 3 +++
4 files changed, 11 insertions(+)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7e34b9eba5de..adda078d6df7 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -13,6 +13,7 @@ config ARM64
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_DMA_COHERENT_TO_PFN
select ARCH_HAS_DMA_MMAP_PGPROT
+ select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 725a115759c9..2c3178848b7d 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -1,6 +1,7 @@
config CSKY
def_bool y
select ARCH_32BIT_OFF_T
+ select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_USE_BUILTIN_BSWAP
diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h
index 69b36ed31a99..9741767e400f 100644
--- a/include/linux/dma-noncoherent.h
+++ b/include/linux/dma-noncoherent.h
@@ -72,6 +72,12 @@ static inline void arch_sync_dma_for_cpu_all(struct device *dev)
}
#endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
+#ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
void arch_dma_prep_coherent(struct page *page, size_t size);
+#else
+static inline void arch_dma_prep_coherent(struct page *page, size_t size)
+{
+}
+#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
#endif /* _LINUX_DMA_NONCOHERENT_H */
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 52b704e2b97a..83d711f8d665 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -38,6 +38,9 @@ config ARCH_HAS_SYNC_DMA_FOR_CPU
config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
bool
+config ARCH_HAS_DMA_PREP_COHERENT
+ bool
+
config ARCH_HAS_DMA_COHERENT_TO_PFN
bool
--
2.20.1
next prev parent reply other threads:[~2019-04-30 10:53 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 10:51 implement generic dma_map_ops for IOMMUs v4 Christoph Hellwig
2019-04-30 10:51 ` [PATCH 01/25] arm64/iommu: handle non-remapped addresses in ->mmap and ->get_sgtable Christoph Hellwig
2019-05-03 11:33 ` Catalin Marinas
2019-05-07 6:37 ` Christoph Hellwig
2019-05-07 9:05 ` Will Deacon
2019-04-30 10:51 ` Christoph Hellwig [this message]
2019-05-03 11:36 ` [PATCH 02/25] dma-mapping: add a Kconfig symbol to indicated arch_dma_prep_coherent presence Catalin Marinas
2019-04-30 10:51 ` [PATCH 03/25] iommu/dma: Cleanup dma-iommu.h Christoph Hellwig
2019-04-30 10:51 ` [PATCH 04/25] iommu/dma: Remove the flush_page callback Christoph Hellwig
2019-05-03 11:43 ` Catalin Marinas
2019-05-03 11:44 ` Catalin Marinas
2019-04-30 10:51 ` [PATCH 05/25] iommu/dma: Use for_each_sg in iommu_dma_alloc Christoph Hellwig
2019-04-30 10:51 ` [PATCH 06/25] iommu/dma: move the arm64 wrappers to common code Christoph Hellwig
2019-05-03 11:45 ` Catalin Marinas
2019-04-30 10:51 ` [PATCH 07/25] iommu/dma: Move __iommu_dma_map Christoph Hellwig
2019-04-30 10:51 ` [PATCH 08/25] iommu/dma: Move domain lookup into __iommu_dma_{map,unmap} Christoph Hellwig
2019-04-30 10:51 ` [PATCH 09/25] iommu/dma: Squash __iommu_dma_{map,unmap}_page helpers Christoph Hellwig
2019-04-30 10:51 ` [PATCH 10/25] iommu/dma: Factor out remapped pages lookup Christoph Hellwig
2019-04-30 10:52 ` [PATCH 11/25] iommu/dma: Refactor the page array remapping allocator Christoph Hellwig
2019-04-30 10:52 ` [PATCH 12/25] iommu/dma: Remove __iommu_dma_free Christoph Hellwig
2019-04-30 10:52 ` [PATCH 13/25] iommu/dma: Refactor iommu_dma_free Christoph Hellwig
2019-04-30 10:52 ` [PATCH 14/25] iommu/dma: Refactor iommu_dma_alloc Christoph Hellwig
2019-04-30 10:52 ` [PATCH 15/25] iommu/dma: Don't remap CMA unnecessarily Christoph Hellwig
2019-04-30 10:52 ` [PATCH 16/25] iommu/dma: Merge the CMA and alloc_pages allocation paths Christoph Hellwig
2019-04-30 10:52 ` [PATCH 17/25] iommu/dma: Split iommu_dma_free Christoph Hellwig
2019-04-30 10:52 ` [PATCH 18/25] iommu/dma: Cleanup variable naming in iommu_dma_alloc Christoph Hellwig
2019-04-30 10:52 ` [PATCH 19/25] iommu/dma: Refactor iommu_dma_alloc, part 2 Christoph Hellwig
2019-04-30 10:52 ` [PATCH 20/25] iommu/dma: Refactor iommu_dma_get_sgtable Christoph Hellwig
2019-04-30 10:52 ` [PATCH 21/25] iommu/dma: Refactor iommu_dma_mmap Christoph Hellwig
2019-04-30 10:52 ` [PATCH 22/25] iommu/dma: Don't depend on CONFIG_DMA_DIRECT_REMAP Christoph Hellwig
2019-04-30 10:52 ` [PATCH 23/25] iommu/dma: Switch copyright boilerplace to SPDX Christoph Hellwig
2019-04-30 10:52 ` [PATCH 24/25] arm64: switch copyright boilerplace to SPDX in dma-mapping.c Christoph Hellwig
2019-05-03 11:45 ` Catalin Marinas
2019-04-30 10:52 ` [PATCH 25/25] arm64: trim includes " Christoph Hellwig
2019-05-03 11:46 ` Catalin Marinas
2019-05-02 13:22 ` implement generic dma_map_ops for IOMMUs v4 Christoph Hellwig
2019-05-03 11:47 ` Catalin Marinas
2019-05-03 11:59 ` Christoph Hellwig
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