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@xxxxxxxxx>
> ---
> 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);
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