[RFC/PATCH 0/5] Read-only memremap() proposal

[RFC/PATCH 0/5] Read-only memremap() proposal

[Stephen Boyd]

This patch series implements a read-only version of memremap() via
a new MEMREMAP_RO flag. If this is passed in the mapping call, we'll
try to map the memory region as read-only if it doesn't intersect
with an existing mapping. Otherwise, we'll try to fallback to other
flags to try to map the memory that way.

The main use case I have is to map the command-db memory region on
Qualcomm devices with a read-only mapping. It's already a const marked
pointer and the API returns const pointers as well, so this series makes
sure that even stray writes can't modify the memory. To get there we
introduce a devm version of memremap() for a reserved memory region, add
a memremap() flag, and implement support for that flag on arm64.

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>

Stephen Boyd (5):
  reserved_mem: Add a devm_memremap_reserved_mem() API
  soc: qcom: cmd-db: Migrate to devm_memremap_reserved_mem()
  memremap: Add support for read-only memory mappings
  arm64: Add support for arch_memremap_ro()
  soc: qcom: cmd-db: Map with read-only mappings

 arch/arm64/include/asm/io.h     |  1 +
 drivers/of/of_reserved_mem.c    | 45 +++++++++++++++++++++++++++++++++
 drivers/soc/qcom/cmd-db.c       | 14 +++-------
 include/linux/io.h              |  1 +
 include/linux/of_reserved_mem.h |  6 +++++
 kernel/iomem.c                  | 15 +++++++++--
 6 files changed, 70 insertions(+), 12 deletions(-)


base-commit: 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b
prerequisite-patch-id: 62119e27c0c0686e02f0cb55c296b878fb7f5e47
prerequisite-patch-id: bda32cfc1733c245ae3f141d7c27b18e4adcc628
prerequisite-patch-id: b8f8097161bd15e87d54dcfbfa67b9ca1abc7204
-- 
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[RFC/PATCH 1/5] reserved_mem: Add a devm_memremap_reserved_mem() API

[Stephen Boyd]

We have a few drivers that need to get a reserved memory region, request
the region, and map the reserved memory with memremap(). Add an API to
do this all in one function call.

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>
---
 drivers/of/of_reserved_mem.c    | 45 +++++++++++++++++++++++++++++++++
 include/linux/of_reserved_mem.h |  6 +++++
 2 files changed, 51 insertions(+)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 6a36bc0b3d64..39ab2bfd40d7 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -12,6 +12,7 @@
 #define pr_fmt(fmt)	"OF: reserved mem: " fmt
 
 #include <linux/err.h>
+#include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
@@ -395,3 +396,47 @@ struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(of_reserved_mem_lookup);
+
+/**
+ * devm_memremap_reserved_mem() - acquire reserved_mem from a device node,
+ *                                request and memremap it
+ * @dev: device with node pointer of the desired reserved-memory region
+ * @flags: flags to pass to memremap()
+ *
+ * This function allows drivers to acquire a reference to the reserved_mem
+ * struct based on the device's device_node handle, request it and then
+ * memremap() it.
+ *
+ * Returns: A remapped reserved memory region, or an error pointer on failure.
+ */
+void *devm_memremap_reserved_mem(struct device *dev, unsigned long flags)
+{
+	void *dest_ptr;
+	struct reserved_mem *rmem;
+	struct resource *res;
+	const char *name;
+
+	rmem = of_reserved_mem_lookup(dev->of_node);
+	if (!rmem) {
+		dev_err(dev, "failed to acquire memory region\n");
+		return ERR_PTR(-ENODEV);
+	}
+
+	name = rmem->name ? : dev_name(dev);
+
+	res = devm_request_mem_region(dev, rmem->base, rmem->size, name);
+	if (!res) {
+		dev_err(dev, "can't request region for reserved memory\n");
+		return ERR_PTR(-EBUSY);
+	}
+
+	dest_ptr = devm_memremap(dev, rmem->base, rmem->size, flags);
+	if (!dest_ptr) {
+		dev_err(dev, "memremap failed for reserved memory\n");
+		devm_release_mem_region(dev, rmem->base, rmem->size);
+		dest_ptr = ERR_PTR(-ENOMEM);
+	}
+
+	return dest_ptr;
+}
+EXPORT_SYMBOL_GPL(devm_memremap_reserved_mem);
diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
index 60f541912ccf..a36be60ef67c 100644
--- a/include/linux/of_reserved_mem.h
+++ b/include/linux/of_reserved_mem.h
@@ -39,6 +39,7 @@ void fdt_init_reserved_mem(void);
 void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
 			       phys_addr_t base, phys_addr_t size);
 struct reserved_mem *of_reserved_mem_lookup(struct device_node *np);
+void *devm_memremap_reserved_mem(struct device *dev, unsigned long flags);
 #else
 static inline int of_reserved_mem_device_init_by_idx(struct device *dev,
 					struct device_node *np, int idx)
@@ -54,6 +55,11 @@ static inline struct reserved_mem *of_reserved_mem_lookup(struct device_node *np
 {
 	return NULL;
 }
+static inline void *devm_memremap_reserved_mem(struct device *dev,
+					       unsigned long flags)
+{
+	return NULL;
+}
 #endif
 
 /**
-- 
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[RFC/PATCH 2/5] soc: qcom: cmd-db: Migrate to devm_memremap_reserved_mem()

[Stephen Boyd]

This gets rid of some duplicate code, and also makes the reserved memory
region show up as 'cmd-db' memory in /proc/iomem.

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>
---
 drivers/soc/qcom/cmd-db.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
index f6c3d17b05c7..10a34d26b753 100644
--- a/drivers/soc/qcom/cmd-db.c
+++ b/drivers/soc/qcom/cmd-db.c
@@ -238,18 +238,11 @@ EXPORT_SYMBOL(cmd_db_read_slave_id);
 
 static int cmd_db_dev_probe(struct platform_device *pdev)
 {
-	struct reserved_mem *rmem;
 	int ret = 0;
 
-	rmem = of_reserved_mem_lookup(pdev->dev.of_node);
-	if (!rmem) {
-		dev_err(&pdev->dev, "failed to acquire memory region\n");
-		return -EINVAL;
-	}
-
-	cmd_db_header = memremap(rmem->base, rmem->size, MEMREMAP_WB);
-	if (!cmd_db_header) {
-		ret = -ENOMEM;
+	cmd_db_header = devm_memremap_reserved_mem(&pdev->dev, MEMREMAP_WB);
+	if (IS_ERR(cmd_db_header)) {
+		ret = PTR_ERR(cmd_db_header);
 		cmd_db_header = NULL;
 		return ret;
 	}
-- 
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[RFC/PATCH 3/5] memremap: Add support for read-only memory mappings

[Stephen Boyd]

Sometimes we have memories that are supposed to be read-only, but when
we map these regions the best we can do is map them as write-back with
MEMREMAP_WB. Introduce a read-only memory mapping (MEMREMAP_RO) that
allows us to map reserved memory regions as read-only. This way, we're
less likely to see these special memory regions become corrupted by
stray writes to them.

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>
---
 include/linux/io.h |  1 +
 kernel/iomem.c     | 15 +++++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/linux/io.h b/include/linux/io.h
index 32e30e8fb9db..16c7f4498869 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -159,6 +159,7 @@ enum {
 	MEMREMAP_WC = 1 << 2,
 	MEMREMAP_ENC = 1 << 3,
 	MEMREMAP_DEC = 1 << 4,
+	MEMREMAP_RO = 1 << 5,
 };
 
 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
diff --git a/kernel/iomem.c b/kernel/iomem.c
index f7525e14ebc6..8d3cf74a32cb 100644
--- a/kernel/iomem.c
+++ b/kernel/iomem.c
@@ -19,6 +19,13 @@ static void *arch_memremap_wb(resource_size_t offset, unsigned long size)
 }
 #endif
 
+#ifndef arch_memremap_ro
+static void *arch_memremap_ro(resource_size_t offset, unsigned long size)
+{
+	return NULL;
+}
+#endif
+
 #ifndef arch_memremap_can_ram_remap
 static bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
 					unsigned long flags)
@@ -84,7 +91,10 @@ void *memremap(resource_size_t offset, size_t size, unsigned long flags)
 	}
 
 	/* Try all mapping types requested until one returns non-NULL */
-	if (flags & MEMREMAP_WB) {
+	if ((flags & MEMREMAP_RO) && is_ram != REGION_INTERSECTS)
+		addr = arch_memremap_ro(offset, size);
+
+	if (!addr && (flags & MEMREMAP_WB)) {
 		/*
 		 * MEMREMAP_WB is special in that it can be satisifed
 		 * from the direct map.  Some archs depend on the
@@ -103,7 +113,8 @@ void *memremap(resource_size_t offset, size_t size, unsigned long flags)
 	 * address mapping.  Enforce that this mapping is not aliasing
 	 * System RAM.
 	 */
-	if (!addr && is_ram == REGION_INTERSECTS && flags != MEMREMAP_WB) {
+	if (!addr && is_ram == REGION_INTERSECTS &&
+	    (flags != MEMREMAP_WB || flags != MEMREMAP_RO)) {
 		WARN_ONCE(1, "memremap attempted on ram %pa size: %#lx\n",
 				&offset, (unsigned long) size);
 		return NULL;
-- 
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[RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()

[Stephen Boyd]

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
 
 /*
-- 
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[RFC/PATCH 5/5] soc: qcom: cmd-db: Map with read-only mappings

[Stephen Boyd]

The command DB is read-only already to the kernel because everything is
const marked once we map it. Let's go one step further and try to map
the memory as read-only in the page tables. This should make it harder
for random code to corrupt the database and change the contents.

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>
---
 drivers/soc/qcom/cmd-db.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
index 10a34d26b753..6365e8260282 100644
--- a/drivers/soc/qcom/cmd-db.c
+++ b/drivers/soc/qcom/cmd-db.c
@@ -240,7 +240,8 @@ static int cmd_db_dev_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 
-	cmd_db_header = devm_memremap_reserved_mem(&pdev->dev, MEMREMAP_WB);
+	cmd_db_header = devm_memremap_reserved_mem(&pdev->dev,
+						   MEMREMAP_RO | MEMREMAP_WB);
 	if (IS_ERR(cmd_db_header)) {
 		ret = PTR_ERR(cmd_db_header);
 		cmd_db_header = NULL;
-- 
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Re: [RFC/PATCH 0/5] Read-only memremap() proposal

[Bjorn Andersson]

On Fri 17 May 09:47 PDT 2019, Stephen Boyd wrote:

> This patch series implements a read-only version of memremap() via
> a new MEMREMAP_RO flag. If this is passed in the mapping call, we'll
> try to map the memory region as read-only if it doesn't intersect
> with an existing mapping. Otherwise, we'll try to fallback to other
> flags to try to map the memory that way.
> 
> The main use case I have is to map the command-db memory region on
> Qualcomm devices with a read-only mapping. It's already a const marked
> pointer and the API returns const pointers as well, so this series makes
> sure that even stray writes can't modify the memory. To get there we
> introduce a devm version of memremap() for a reserved memory region, add
> a memremap() flag, and implement support for that flag on arm64.
> 

I have a few places where the first patch will be useful, and the rest
looks good.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> 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>
> 
> Stephen Boyd (5):
>   reserved_mem: Add a devm_memremap_reserved_mem() API
>   soc: qcom: cmd-db: Migrate to devm_memremap_reserved_mem()
>   memremap: Add support for read-only memory mappings
>   arm64: Add support for arch_memremap_ro()
>   soc: qcom: cmd-db: Map with read-only mappings
> 
>  arch/arm64/include/asm/io.h     |  1 +
>  drivers/of/of_reserved_mem.c    | 45 +++++++++++++++++++++++++++++++++
>  drivers/soc/qcom/cmd-db.c       | 14 +++-------
>  include/linux/io.h              |  1 +
>  include/linux/of_reserved_mem.h |  6 +++++
>  kernel/iomem.c                  | 15 +++++++++--
>  6 files changed, 70 insertions(+), 12 deletions(-)
> 
> 
> base-commit: 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b
> prerequisite-patch-id: 62119e27c0c0686e02f0cb55c296b878fb7f5e47
> prerequisite-patch-id: bda32cfc1733c245ae3f141d7c27b18e4adcc628
> prerequisite-patch-id: b8f8097161bd15e87d54dcfbfa67b9ca1abc7204
> -- 
> Sent by a computer through tubes
> 

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Re: [RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()

[Catalin Marinas]

On Fri, May 17, 2019 at 09:47:45AM -0700, Stephen Boyd wrote:
> 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>

Not sure what the plans are with this series but if you need an ack for
arm64:

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

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Re: [RFC/PATCH 4/5] arm64: Add support for arch_memremap_ro()

[Stephen Boyd]

Quoting Catalin Marinas (2019-06-03 08:56:13)
> On Fri, May 17, 2019 at 09:47:45AM -0700, Stephen Boyd wrote:
> > 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>
> 
> Not sure what the plans are with this series but if you need an ack for
> arm64:
> 
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>

Thanks. I'll resend without the RFC tag and see how it goes.


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Re: [RFC/PATCH 1/5] reserved_mem: Add a devm_memremap_reserved_mem() API

[Rob Herring]

On Fri, 17 May 2019 09:47:42 -0700, Stephen Boyd wrote:
> We have a few drivers that need to get a reserved memory region, request
> the region, and map the reserved memory with memremap(). Add an API to
> do this all in one function call.
> 
> 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>
> ---
>  drivers/of/of_reserved_mem.c    | 45 +++++++++++++++++++++++++++++++++
>  include/linux/of_reserved_mem.h |  6 +++++
>  2 files changed, 51 insertions(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

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