linux-kernel - [RFC PATCH V4 3/6] RISC-V: Support a new config option for non-coherent DMA

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Date:   Sat, 11 Sep 2021 17:21:36 +0800
From:   guoren@...nel.org
To:     anup.patel@....com, atish.patra@....com, palmerdabbelt@...gle.com,
        guoren@...nel.org, christoph.muellner@...ll.eu,
        philipp.tomsich@...ll.eu, hch@....de, liush@...winnertech.com,
        wefu@...hat.com, lazyparser@...il.com, drew@...gleboard.org
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        taiten.peng@...onical.com, aniket.ponkshe@...onical.com,
        heinrich.schuchardt@...onical.com, gordan.markus@...onical.com,
        Guo Ren <guoren@...ux.alibaba.com>
Subject: [RFC PATCH V4 3/6] RISC-V: Support a new config option for non-coherent DMA

From: Atish Patra <atish.patra@....com>

In future, there will be more RISC-V platforms with non-coherent DMA.
Instead of selecting all the required config options in every soc, create
a new config that selects all the required configs related non-coherent
DMA.

Signed-off-by: Atish Patra <atish.patra@....com>

RISC-V: Support DMA_DIRECT_REMAP for non-coherent DMA

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
---
 arch/riscv/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 3ab3730bee92..d18a59ea10e5 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -213,6 +213,15 @@ config PGTABLE_LEVELS
 config LOCKDEP_SUPPORT
 	def_bool y
 
+config RISCV_DMA_NONCOHERENT
+	bool
+	select ARCH_HAS_DMA_PREP_COHERENT
+	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+	select ARCH_HAS_SYNC_DMA_FOR_CPU
+	select ARCH_HAS_SETUP_DMA_OPS
+	select DMA_GLOBAL_POOL
+	select DMA_DIRECT_REMAP
+
 source "arch/riscv/Kconfig.socs"
 source "arch/riscv/Kconfig.erratas"
 
-- 
2.25.1