Re: [PATCH V3 5/7] serial: earlycon: Set UPIO_MEM32BE based on DT properties

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On Mon, Apr 6, 2015 at 12:36 PM, Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> wrote:
> On 04/02/2015 11:35 AM, Peter Hurley wrote:
>> On 04/02/2015 09:46 AM, Rob Herring wrote:
>>> Sorry about that. I had thought about doing the same thing. At least
>>> unifying the macros, but not necessarily the tables. If it is also
>>> extendable to other firmware interfaces like ACPI perhaps that would
>>> be good.
>>
>> No need to apologize; I'll make those changes and resubmit for your
>> review.
>
> What about something like the following?
>
> This patch makes both __earlycon_table and __earlycon_of_table
> arrays of struct earlycon_id, and a follow-on patch would use the
> earlycon name to initialize the struct console fields.
>
> The benefits of this approach are
> 1. diagnostics can readily identify the earlycon if there is some error
> 2. it would be trivial to enable both command line and devicetree
>    earlycon from the same earlycon declaration.
>
> And a single table is doable from this point.
>
> AFAICT there is no benefit to using actual OF tables, and I see no
> other reasonable way to initialize the name of the struct console
> for devicetree earlycons.

Just to align all the OF linker sections, but having a common table is
better. So the patch looks okay to me.

Rob

>
> Regards,
> Peter Hurley
>
>
> --- >% ---
> Subject: [PATCH] serial: earlycon: Use common framework for earlycon
>  declarations
>
> Use common table definition and implementation macro to declare an
> earlycon, but retain separate tables for command line and devicetree.
> Add __EARLYCON_DECLARE() macro to instance a unique earlycon
> declaration for the specified table.
>
> This enables all earlycons to properly initialize the earlycon console
> structure with name and index.
>
> Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
> ---
>  drivers/of/fdt.c                  |  6 +++---
>  drivers/tty/serial/earlycon.c     |  3 +--
>  include/asm-generic/vmlinux.lds.h |  8 ++++++--
>  include/linux/serial_core.h       | 30 +++++++++++++++++++++---------
>  4 files changed, 31 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 7cef9f9..f640efa 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -760,14 +760,14 @@ static inline void early_init_dt_check_for_initrd(unsigned long node)
>  #endif /* CONFIG_BLK_DEV_INITRD */
>
>  #ifdef CONFIG_SERIAL_EARLYCON
> -extern struct of_device_id __earlycon_of_table[];
> +extern struct earlycon_id __earlycon_of_table[];
>
>  static int __init early_init_dt_scan_chosen_serial(void)
>  {
>         int offset;
>         const char *p, *q;
>         int l;
> -       const struct of_device_id *match = __earlycon_of_table;
> +       const struct earlycon_id *match = __earlycon_of_table;
>         const void *fdt = initial_boot_params;
>
>         offset = fdt_path_offset(fdt, "/chosen");
> @@ -800,7 +800,7 @@ static int __init early_init_dt_scan_chosen_serial(void)
>                 if (!addr)
>                         return -ENXIO;
>
> -               of_setup_earlycon(addr, match->data);
> +               of_setup_earlycon(addr, match->setup);
>                 return 0;
>         }
>         return -ENODEV;
> diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
> index 5fdc9f3..bf7eb76 100644
> --- a/drivers/tty/serial/earlycon.c
> +++ b/drivers/tty/serial/earlycon.c
> @@ -19,7 +19,6 @@
>  #include <linux/io.h>
>  #include <linux/serial_core.h>
>  #include <linux/sizes.h>
> -#include <linux/mod_devicetable.h>
>
>  #ifdef CONFIG_FIX_EARLYCON_MEM
>  #include <asm/fixmap.h>
> @@ -41,7 +40,7 @@ extern struct earlycon_id __earlycon_table[];
>  static const struct earlycon_id __earlycon_table_sentinel
>         __used __section(__earlycon_table_end);
>
> -static const struct of_device_id __earlycon_of_table_sentinel
> +static const struct earlycon_id __earlycon_of_table_sentinel
>         __used __section(__earlycon_of_table_end);
>
>  static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 561daf4..7322c30 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -155,8 +155,13 @@
>                          VMLINUX_SYMBOL(__earlycon_table) = .;  \
>                          *(__earlycon_table)                    \
>                          *(__earlycon_table_end)
> +#define EARLYCON_OF_TABLE()    STRUCT_ALIGN();                          \
> +                               VMLINUX_SYMBOL(__earlycon_of_table) = .; \
> +                               *(__earlycon_of_table)                   \
> +                               *(__earlycon_of_table_end)
>  #else
>  #define EARLYCON_TABLE()
> +#define EARLYCON_OF_TABLE()
>  #endif
>
>  #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name)
> @@ -175,7 +180,6 @@
>  #define IOMMU_OF_TABLES()      OF_TABLE(CONFIG_OF_IOMMU, iommu)
>  #define RESERVEDMEM_OF_TABLES()        OF_TABLE(CONFIG_OF_RESERVED_MEM, reservedmem)
>  #define CPU_METHOD_OF_TABLES() OF_TABLE(CONFIG_SMP, cpu_method)
> -#define EARLYCON_OF_TABLES()   OF_TABLE(CONFIG_SERIAL_EARLYCON, earlycon)
>
>  #define KERNEL_DTB()                                                   \
>         STRUCT_ALIGN();                                                 \
> @@ -512,7 +516,7 @@
>         KERNEL_DTB()                                                    \
>         IRQCHIP_OF_MATCH_TABLE()                                        \
>         EARLYCON_TABLE()                                                \
> -       EARLYCON_OF_TABLES()
> +       EARLYCON_OF_TABLE()
>
>  #define INIT_TEXT                                                      \
>         *(.init.text)                                                   \
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 025dad9..9455e97 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -341,22 +341,34 @@ struct earlycon_device {
>
>  struct earlycon_id {
>         char    name[16];
> +       char    compatible[128];
>         int     (*setup)(struct earlycon_device *, const char *options);
>  } __aligned(32);
>
> +#define EARLYCON_TABLE __used __section(__earlycon_table)
> +
> +#ifdef CONFIG_OF
> +#define EARLYCON_OF_TABLE __used __section(__earlycon_of_table)
> +#else
> +#define EARLYCON_OF_TABLE __attribute__((unused))
> +#endif
> +
> +#define __EARLYCON_DECLARE(_name, compat, fn, pre, section)            \
> +       static const struct earlycon_id __UNIQUE_ID(pre##_name) section \
> +                = { .name = __stringify(_name),                        \
> +                    .compatible = compat,                              \
> +                    .setup = fn  }
> +
> +#define EARLYCON_DECLARE(_name, fn)                                    \
> +       __EARLYCON_DECLARE(_name, "", fn, __earlycon_, EARLYCON_TABLE)
> +
> +#define OF_EARLYCON_DECLARE(_name, compat, fn)                         \
> +       __EARLYCON_DECLARE(_name, compat, fn, __earlycon_of_, EARLYCON_OF_TABLE)
> +
>  extern int setup_earlycon(char *buf);
>  extern int of_setup_earlycon(unsigned long addr,
>                              int (*setup)(struct earlycon_device *, const char *));
>
> -#define EARLYCON_DECLARE(_name, func)                                  \
> -       static const struct earlycon_id __earlycon_##_name              \
> -               __used __section(__earlycon_table)                      \
> -                = { .name  = __stringify(_name),                       \
> -                    .setup = func  }
> -
> -#define OF_EARLYCON_DECLARE(name, compat, fn)                          \
> -       _OF_DECLARE(earlycon, name, compat, fn, void *)
> -
>  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,
> --
> 2.3.5
>
>
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