[PATCH] serial: earlycon: Extend earlycon command line option to support 64-bit addresses

[PATCH] serial: earlycon: Extend earlycon command line option to support 64-bit addresses

[Alexander Sverdlin]

earlycon implementation used "unsigned long" internally, but there are systems
(ARM with LPAE) where sizeof(unsigned long) == 4 and uart is mapped beyond 4GiB
address range.

Switch to resource_size_t internally and replace obsoleted simple_strtoul() with
kstrtoull().

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
---
 drivers/tty/serial/8250/8250_core.c |  2 +-
 drivers/tty/serial/earlycon.c       |  7 +++----
 drivers/tty/serial/serial_core.c    | 12 +++++++++---
 include/linux/serial_core.h         |  2 +-
 4 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 13ad5c3..f64d6cd 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -639,7 +639,7 @@ static int univ8250_console_match(struct console *co, char *name, int idx,
 {
 	char match[] = "uart";	/* 8250-specific earlycon name */
 	unsigned char iotype;
-	unsigned long addr;
+	resource_size_t addr;
 	int i;
 
 	if (strncmp(name, match, 4) != 0)
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 067783f..3940280 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -38,7 +38,7 @@ static struct earlycon_device early_console_dev = {
 	.con = &early_con,
 };
 
-static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
+static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
 {
 	void __iomem *base;
 #ifdef CONFIG_FIX_EARLYCON_MEM
@@ -49,8 +49,7 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
 	base = ioremap(paddr, size);
 #endif
 	if (!base)
-		pr_err("%s: Couldn't map 0x%llx\n", __func__,
-		       (unsigned long long)paddr);
+		pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
 
 	return base;
 }
@@ -92,7 +91,7 @@ static int __init parse_options(struct earlycon_device *device, char *options)
 {
 	struct uart_port *port = &device->port;
 	int length;
-	unsigned long addr;
+	resource_size_t addr;
 
 	if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
 		return -EINVAL;
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9fc1533..89f5d6a 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1938,11 +1938,14 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
  *	   console=<name>,0x<addr>,<options>
  *	is also accepted; the returned @iotype will be UPIO_MEM.
  *
- *	Returns 0 on success or -EINVAL on failure
+ *	Returns 0 on success, -EINVAL or -ERANGE on failure
  */
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options)
 {
+	int ret;
+	unsigned long long tmp;
+
 	if (strncmp(p, "mmio,", 5) == 0) {
 		*iotype = UPIO_MEM;
 		p += 5;
@@ -1968,7 +1971,10 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
 		return -EINVAL;
 	}
 
-	*addr = simple_strtoul(p, NULL, 0);
+	ret = kstrtoull(p, 0, &tmp);
+	if (ret)
+		return ret;
+	*addr = tmp;
 	p = strchr(p, ',');
 	if (p)
 		p++;
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 2f44e20..cdba6f1 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -374,7 +374,7 @@ extern int of_setup_earlycon(const struct earlycon_id *match,
 
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 				   struct console *c);
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options);
 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 			int *flow);

[PATCH] serial: earlycon: Extend earlycon command line option to support 64-bit addresses

[Alexander Sverdlin]

earlycon implementation used "unsigned long" internally, but there are systems
(ARM with LPAE) where sizeof(unsigned long) == 4 and uart is mapped beyond 4GiB
address range.

Switch to resource_size_t internally and replace obsoleted simple_strtoul() with
kstrtoull().

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
---
 drivers/tty/serial/8250/8250_core.c |  2 +-
 drivers/tty/serial/earlycon.c       |  7 +++----
 drivers/tty/serial/serial_core.c    | 12 +++++++++---
 include/linux/serial_core.h         |  2 +-
 4 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 13ad5c3..f64d6cd 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -639,7 +639,7 @@ static int univ8250_console_match(struct console *co, char *name, int idx,
 {
 	char match[] = "uart";	/* 8250-specific earlycon name */
 	unsigned char iotype;
-	unsigned long addr;
+	resource_size_t addr;
 	int i;
 
 	if (strncmp(name, match, 4) != 0)
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
index 067783f..3940280 100644
--- a/drivers/tty/serial/earlycon.c
+++ b/drivers/tty/serial/earlycon.c
@@ -38,7 +38,7 @@ static struct earlycon_device early_console_dev = {
 	.con = &early_con,
 };
 
-static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
+static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
 {
 	void __iomem *base;
 #ifdef CONFIG_FIX_EARLYCON_MEM
@@ -49,8 +49,7 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
 	base = ioremap(paddr, size);
 #endif
 	if (!base)
-		pr_err("%s: Couldn't map 0x%llx\n", __func__,
-		       (unsigned long long)paddr);
+		pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
 
 	return base;
 }
@@ -92,7 +91,7 @@ static int __init parse_options(struct earlycon_device *device, char *options)
 {
 	struct uart_port *port = &device->port;
 	int length;
-	unsigned long addr;
+	resource_size_t addr;
 
 	if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
 		return -EINVAL;
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9fc1533..89f5d6a 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1938,11 +1938,14 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
  *	   console=<name>,0x<addr>,<options>
  *	is also accepted; the returned @iotype will be UPIO_MEM.
  *
- *	Returns 0 on success or -EINVAL on failure
+ *	Returns 0 on success, -EINVAL or -ERANGE on failure
  */
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options)
 {
+	int ret;
+	unsigned long long tmp;
+
 	if (strncmp(p, "mmio,", 5) == 0) {
 		*iotype = UPIO_MEM;
 		p += 5;
@@ -1968,7 +1971,10 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
 		return -EINVAL;
 	}
 
-	*addr = simple_strtoul(p, NULL, 0);
+	ret = kstrtoull(p, 0, &tmp);
+	if (ret)
+		return ret;
+	*addr = tmp;
 	p = strchr(p, ',');
 	if (p)
 		p++;
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 2f44e20..cdba6f1 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -374,7 +374,7 @@ extern int of_setup_earlycon(const struct earlycon_id *match,
 
 struct uart_port *uart_get_console(struct uart_port *ports, int nr,
 				   struct console *c);
-int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
+int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options);
 void uart_parse_options(char *options, int *baud, int *parity, int *bits,
 			int *flow);

Re: serial: earlycon: Extend earlycon command line option to support 64-bit addresses

[Guenter Roeck]

Hi,

On Fri, Sep 02, 2016 at 01:20:21PM +0200, Alexander Sverdlin wrote:
> earlycon implementation used "unsigned long" internally, but there are systems
> (ARM with LPAE) where sizeof(unsigned long) == 4 and uart is mapped beyond 4GiB
> address range.
> 
> Switch to resource_size_t internally and replace obsoleted simple_strtoul() with
> kstrtoull().
> 

This patch breaks a qemu emulation using
	console=uart,mmio,0x90000000,115200
as command line argument. Problem appears to be the replacement of
simple_strtoul() with kstrtoull(). It looks like simple_strtoul() parsed
the address, but kstrtoull() doesn't. Reverting the kstrtoull() back to
simple_strtoul() fixes the problem for me.

The command line in question is found in arch/openrisc/boot/dts/or1ksim.dts.
There are similar command lines in other dts files, which makes me suspect
that this construct is also used by out-of-kernel command lines. Besides, the
code looks for ',' after the address, which suggests that the above should be
a valid argument.

Is this change to kstrtoull really necessary ? If yes, can you make it work
with existing command lines ?

Thanks,
Guenter

> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
> ---
>  drivers/tty/serial/8250/8250_core.c |  2 +-
>  drivers/tty/serial/earlycon.c       |  7 +++----
>  drivers/tty/serial/serial_core.c    | 12 +++++++++---
>  include/linux/serial_core.h         |  2 +-
>  4 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
> index 13ad5c3..f64d6cd 100644
> --- a/drivers/tty/serial/8250/8250_core.c
> +++ b/drivers/tty/serial/8250/8250_core.c
> @@ -639,7 +639,7 @@ static int univ8250_console_match(struct console *co, char *name, int idx,
>  {
>  	char match[] = "uart";	/* 8250-specific earlycon name */
>  	unsigned char iotype;
> -	unsigned long addr;
> +	resource_size_t addr;
>  	int i;
>  
>  	if (strncmp(name, match, 4) != 0)
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> index 067783f..3940280 100644
> --- a/drivers/tty/serial/earlycon.c
> +++ b/drivers/tty/serial/earlycon.c
> @@ -38,7 +38,7 @@ static struct earlycon_device early_console_dev = {
>  	.con = &early_con,
>  };
>  
> -static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
> +static void __iomem * __init earlycon_map(resource_size_t paddr, size_t size)
>  {
>  	void __iomem *base;
>  #ifdef CONFIG_FIX_EARLYCON_MEM
> @@ -49,8 +49,7 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
>  	base = ioremap(paddr, size);
>  #endif
>  	if (!base)
> -		pr_err("%s: Couldn't map 0x%llx\n", __func__,
> -		       (unsigned long long)paddr);
> +		pr_err("%s: Couldn't map %pa\n", __func__, &paddr);
>  
>  	return base;
>  }
> @@ -92,7 +91,7 @@ static int __init parse_options(struct earlycon_device *device, char *options)
>  {
>  	struct uart_port *port = &device->port;
>  	int length;
> -	unsigned long addr;
> +	resource_size_t addr;
>  
>  	if (uart_parse_earlycon(options, &port->iotype, &addr, &options))
>  		return -EINVAL;
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 9fc1533..89f5d6a 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -1938,11 +1938,14 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
>   *	   console=<name>,0x<addr>,<options>
>   *	is also accepted; the returned @iotype will be UPIO_MEM.
>   *
> - *	Returns 0 on success or -EINVAL on failure
> + *	Returns 0 on success, -EINVAL or -ERANGE on failure
>   */
> -int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
> +int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
>  			char **options)
>  {
> +	int ret;
> +	unsigned long long tmp;
> +
>  	if (strncmp(p, "mmio,", 5) == 0) {
>  		*iotype = UPIO_MEM;
>  		p += 5;
> @@ -1968,7 +1971,10 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
>  		return -EINVAL;
>  	}
>  
> -	*addr = simple_strtoul(p, NULL, 0);
> +	ret = kstrtoull(p, 0, &tmp);
> +	if (ret)
> +		return ret;
> +	*addr = tmp;
>  	p = strchr(p, ',');
>  	if (p)
>  		p++;
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 2f44e20..cdba6f1 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -374,7 +374,7 @@ extern int of_setup_earlycon(const struct earlycon_id *match,
>  
>  struct uart_port *uart_get_console(struct uart_port *ports, int nr,
>  				   struct console *c);
> -int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr,
> +int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
>  			char **options);
>  void uart_parse_options(char *options, int *baud, int *parity, int *bits,
>  			int *flow);

[PATCH] serial: core: Fix handling of options after MMIO address

[Alexander Sverdlin]

Guenter Roeck reported a regression caused by commit "serial: earlycon:
Extend earlycon command line option to support 64-bit addresses":

console= and earlycon= options have the following format:
...,<addr>,<options>

Historically used here simple_strtoul() had no problems with comma, but the
new and recommended kstrtoull() requires null-terminated string and returns
-EINVAL in case there are "options" at the end. There is no recommended to
use function currently that will support it, so stick to obsolete
simple_strtoull() variant.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/tty/serial/serial_core.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 89f5d6a..f2c8a8d 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1938,14 +1938,11 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
  *	   console=<name>,0x<addr>,<options>
  *	is also accepted; the returned @iotype will be UPIO_MEM.
  *
- *	Returns 0 on success, -EINVAL or -ERANGE on failure
+ *	Returns 0 on success or -EINVAL on failure
  */
 int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options)
 {
-	int ret;
-	unsigned long long tmp;
-
 	if (strncmp(p, "mmio,", 5) == 0) {
 		*iotype = UPIO_MEM;
 		p += 5;
@@ -1971,10 +1968,11 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 		return -EINVAL;
 	}
 
-	ret = kstrtoull(p, 0, &tmp);
-	if (ret)
-		return ret;
-	*addr = tmp;
+	/*
+	 * Before you replace it with kstrtoull(), think about options separator
+	 * (',') it will not tolerate
+	 */
+	*addr = simple_strtoull(p, NULL, 0);
 	p = strchr(p, ',');
 	if (p)
 		p++;

[PATCH] serial: core: Fix handling of options after MMIO address

[Alexander Sverdlin]

Guenter Roeck reported a regression caused by commit "serial: earlycon:
Extend earlycon command line option to support 64-bit addresses":

console= and earlycon= options have the following format:
...,<addr>,<options>

Historically used here simple_strtoul() had no problems with comma, but the
new and recommended kstrtoull() requires null-terminated string and returns
-EINVAL in case there are "options" at the end. There is no recommended to
use function currently that will support it, so stick to obsolete
simple_strtoull() variant.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
---
 drivers/tty/serial/serial_core.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 89f5d6a..f2c8a8d 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1938,14 +1938,11 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
  *	   console=<name>,0x<addr>,<options>
  *	is also accepted; the returned @iotype will be UPIO_MEM.
  *
- *	Returns 0 on success, -EINVAL or -ERANGE on failure
+ *	Returns 0 on success or -EINVAL on failure
  */
 int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options)
 {
-	int ret;
-	unsigned long long tmp;
-
 	if (strncmp(p, "mmio,", 5) == 0) {
 		*iotype = UPIO_MEM;
 		p += 5;
@@ -1971,10 +1968,11 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 		return -EINVAL;
 	}
 
-	ret = kstrtoull(p, 0, &tmp);
-	if (ret)
-		return ret;
-	*addr = tmp;
+	/*
+	 * Before you replace it with kstrtoull(), think about options separator
+	 * (',') it will not tolerate
+	 */
+	*addr = simple_strtoull(p, NULL, 0);
 	p = strchr(p, ',');
 	if (p)
 		p++;

Re: [PATCH] serial: core: Fix handling of options after MMIO address

[Guenter Roeck]

On 09/12/2016 04:29 AM, Alexander Sverdlin wrote:
> Guenter Roeck reported a regression caused by commit "serial: earlycon:
> Extend earlycon command line option to support 64-bit addresses":
>
> console= and earlycon= options have the following format:
> ...,<addr>,<options>
>
> Historically used here simple_strtoul() had no problems with comma, but the
> new and recommended kstrtoull() requires null-terminated string and returns
> -EINVAL in case there are "options" at the end. There is no recommended to
> use function currently that will support it, so stick to obsolete
> simple_strtoull() variant.
>
> Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
> Reported-by: Guenter Roeck <linux@roeck-us.net>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/tty/serial/serial_core.c | 14 ++++++--------
>  1 file changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
> index 89f5d6a..f2c8a8d 100644
> --- a/drivers/tty/serial/serial_core.c
> +++ b/drivers/tty/serial/serial_core.c
> @@ -1938,14 +1938,11 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
>   *	   console=<name>,0x<addr>,<options>
>   *	is also accepted; the returned @iotype will be UPIO_MEM.
>   *
> - *	Returns 0 on success, -EINVAL or -ERANGE on failure
> + *	Returns 0 on success or -EINVAL on failure
>   */
>  int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
>  			char **options)
>  {
> -	int ret;
> -	unsigned long long tmp;
> -
>  	if (strncmp(p, "mmio,", 5) == 0) {
>  		*iotype = UPIO_MEM;
>  		p += 5;
> @@ -1971,10 +1968,11 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
>  		return -EINVAL;
>  	}
>
> -	ret = kstrtoull(p, 0, &tmp);
> -	if (ret)
> -		return ret;
> -	*addr = tmp;
> +	/*
> +	 * Before you replace it with kstrtoull(), think about options separator
> +	 * (',') it will not tolerate
> +	 */
> +	*addr = simple_strtoull(p, NULL, 0);
>  	p = strchr(p, ',');
>  	if (p)
>  		p++;
>