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From:   Christoph Hellwig <hch@lst.de>
To:     Palmer Dabbelt <palmer@sifive.com>,
        Paul Walmsley <paul.walmsley@sifive.com>
Cc:     Damien Le Moal <damien.lemoal@wdc.com>,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 04/15] riscv: don't allow selecting SBI based drivers for M-mode
Date:   Thu, 17 Oct 2019 19:37:32 +0200
Message-Id: <20191017173743.5430-5-hch@lst.de>
In-Reply-To: <20191017173743.5430-1-hch@lst.de>
References: <20191017173743.5430-1-hch@lst.de>
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From: Damien Le Moal <damien.lemoal@wdc.com>

When running in M-mode we can't use SBI based drivers.  Add a new
CONFIG_RISCV_SBI that drivers that do SBI calls can depend on
instead.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/riscv/Kconfig         | 6 ++++++
 drivers/tty/hvc/Kconfig    | 2 +-
 drivers/tty/serial/Kconfig | 2 +-
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 86b7e8b0471c..b85492c42ccb 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -76,6 +76,12 @@ config ARCH_MMAP_RND_BITS_MAX
 config RISCV_M_MODE
 	bool
 
+# set if we are running in S-mode and can use SBI calls
+config RISCV_SBI
+	bool
+	depends on !RISCV_M_MODE
+	default y
+
 config MMU
 	def_bool y
 
diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig
index 4d22b911111f..4487a6b9acc8 100644
--- a/drivers/tty/hvc/Kconfig
+++ b/drivers/tty/hvc/Kconfig
@@ -89,7 +89,7 @@ config HVC_DCC
 
 config HVC_RISCV_SBI
 	bool "RISC-V SBI console support"
-	depends on RISCV
+	depends on RISCV_SBI
 	select HVC_DRIVER
 	help
 	  This enables support for console output via RISC-V SBI calls, which
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 67a9eb3f94ce..540142c5b7b3 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -88,7 +88,7 @@ config SERIAL_EARLYCON_ARM_SEMIHOST
 
 config SERIAL_EARLYCON_RISCV_SBI
 	bool "Early console using RISC-V SBI"
-	depends on RISCV
+	depends on RISCV_SBI
 	select SERIAL_CORE
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
-- 
2.20.1