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From: Stephen Boyd <swboyd@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
	Evan Green <evgreen@chromium.org>,
	Rob Herring <robh+dt@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Andy Gross <agross@kernel.org>, Will Deacon <will.deacon@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Dan Williams <dan.j.williams@intel.com>
Subject: [RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()
Date: Fri, 17 May 2019 09:47:45 -0700	[thread overview]
Message-ID: <20190517164746.110786-5-swboyd@chromium.org> (raw)
In-Reply-To: <20190517164746.110786-1-swboyd@chromium.org>

Pass in PAGE_KERNEL_RO to the underlying IO mapping mechanism to get a
read-only mapping for the MEMREMAP_RO type of memory mappings that
memremap() supports.

Cc: Evan Green <evgreen@chromium.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 8bb7210ac286..245bd371e8dc 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -185,6 +185,7 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
 #define ioremap_nocache(addr, size)	__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
 #define ioremap_wc(addr, size)		__ioremap((addr), (size), __pgprot(PROT_NORMAL_NC))
 #define ioremap_wt(addr, size)		__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
+#define arch_memremap_ro(addr, size)	__ioremap((addr), (size), PAGE_KERNEL_RO)
 #define iounmap				__iounmap
 
 /*
-- 
Sent by a computer through tubes


WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <swboyd@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	Will Deacon <will.deacon@arm.com>, Andy Gross <agross@kernel.org>,
	Evan Green <evgreen@chromium.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-arm-kernel@lists.infradead.org
Subject: [RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()
Date: Fri, 17 May 2019 09:47:45 -0700	[thread overview]
Message-ID: <20190517164746.110786-5-swboyd@chromium.org> (raw)
In-Reply-To: <20190517164746.110786-1-swboyd@chromium.org>

Pass in PAGE_KERNEL_RO to the underlying IO mapping mechanism to get a
read-only mapping for the MEMREMAP_RO type of memory mappings that
memremap() supports.

Cc: Evan Green <evgreen@chromium.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 8bb7210ac286..245bd371e8dc 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -185,6 +185,7 @@ extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size);
 #define ioremap_nocache(addr, size)	__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
 #define ioremap_wc(addr, size)		__ioremap((addr), (size), __pgprot(PROT_NORMAL_NC))
 #define ioremap_wt(addr, size)		__ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE))
+#define arch_memremap_ro(addr, size)	__ioremap((addr), (size), PAGE_KERNEL_RO)
 #define iounmap				__iounmap
 
 /*
-- 
Sent by a computer through tubes


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  parent reply	other threads:[~2019-05-17 16:48 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-17 16:47 [RFC/PATCH 0/5] Read-only memremap() proposal Stephen Boyd
2019-05-17 16:47 ` Stephen Boyd
2019-05-17 16:47 ` [RFC/PATCH 1/5] reserved_mem: Add a devm_memremap_reserved_mem() API Stephen Boyd
2019-05-17 16:47   ` Stephen Boyd
2019-06-13 22:51   ` Rob Herring
2019-06-13 22:51     ` Rob Herring
2019-05-17 16:47 ` [RFC/PATCH 2/5] soc: qcom: cmd-db: Migrate to devm_memremap_reserved_mem() Stephen Boyd
2019-05-17 16:47   ` Stephen Boyd
2019-05-17 16:47 ` [RFC/PATCH 3/5] memremap: Add support for read-only memory mappings Stephen Boyd
2019-05-17 16:47   ` Stephen Boyd
2019-05-17 16:47 ` Stephen Boyd [this message]
2019-05-17 16:47   ` [RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro() Stephen Boyd
2019-06-03 15:56   ` Catalin Marinas
2019-06-03 15:56     ` Catalin Marinas
2019-06-04 16:54     ` Stephen Boyd
2019-06-04 16:54       ` Stephen Boyd
2019-05-17 16:47 ` [RFC/PATCH 5/5] soc: qcom: cmd-db: Map with read-only mappings Stephen Boyd
2019-05-17 16:47   ` Stephen Boyd
2019-05-17 17:35 ` [RFC/PATCH 0/5] Read-only memremap() proposal Bjorn Andersson
2019-05-17 17:35   ` Bjorn Andersson

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