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Date: Tue, 10 Jan 2012 20:38:23 -0600
From: Rob Herring <robherring2@...il.com>
To: Doug Anderson <dianders@...omium.org>
CC: devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] of: Support CONFIG_CMDLINE_EXTEND config option
On 01/09/2012 06:54 PM, Doug Anderson wrote:
> The old logic assumes CMDLINE_FROM_BOOTLOADER vs. CMDLINE_FORCE and
> ignores CMDLINE_EXTEND. Here's the old logic:
>
> - CONFIG_CMDLINE_FORCE=true
> CONFIG_CMDLINE
> - dt bootargs=non-empty:
> dt bootargs
> - dt bootargs=empty, @data is non-empty string
> @data is left unchanged
> - dt bootargs=empty, @data is empty string
> CONFIG_CMDLINE (or "" if that's not defined)
>
> The old logic would also not honor CONFIG_CMDLINE_FORCE if there was no
> "chosen" attribute in the device tree.
>
> The new logic is now documented in of_fdt.h and is copied here for
> reference:
>
> - CONFIG_CMDLINE_FORCE=true
> CONFIG_CMDLINE
> - CONFIG_CMDLINE_EXTEND=true
> CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty)
> - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty:
> dt bootargs
> - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string
> @data is left unchanged
> - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string
> CONFIG_CMDLINE (or "" if that's not defined)
>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> CC: devicetree-discuss@...ts-ozlabs.org
> CC: Grant Likely <grant.likely@...retlab.ca>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> ---
Acked-by: Rob Herring <rob.herring@...xeda.com>
I'll apply, but would like Ben's ack first.
Rob
> drivers/of/fdt.c | 56 ++++++++++++++++++++++++++++++++++-------------
> include/linux/of_fdt.h | 19 ++++++++++++++++
> 2 files changed, 59 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index ea2bd1b..577f3a9 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -664,6 +664,29 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
> return 0;
> }
>
> +/*
> + * Convert configs to something easy to use in C code
> + */
> +#if defined(CONFIG_CMDLINE_FORCE)
> +static const int overwrite_incoming_cmdline = 1;
> +static const int read_dt_cmdline;
> +static const int concat_cmdline;
> +#elif defined(CONFIG_CMDLINE_EXTEND)
> +static const int overwrite_incoming_cmdline = 1;
> +static const int read_dt_cmdline = 1;
> +static const int concat_cmdline = 1;
> +#else /* CMDLINE_FROM_BOOTLOADER */
> +static const int overwrite_incoming_cmdline;
> +static const int read_dt_cmdline = 1;
> +static const int concat_cmdline;
> +#endif
> +
> +#ifdef CONFIG_CMDLINE
> +static const char *config_cmdline = CONFIG_CMDLINE;
> +#else
> +static const char *config_cmdline = "";
> +#endif
> +
> int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> int depth, void *data)
> {
> @@ -672,28 +695,29 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
>
> pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
>
> + /* Make sure cmdline default is set early to handle case of no chosen */
> + if (data && (overwrite_incoming_cmdline || !((char *)data)[0]))
> + strlcpy(data, config_cmdline, COMMAND_LINE_SIZE);
> +
> if (depth != 1 || !data ||
> (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
> return 0;
>
> early_init_dt_check_for_initrd(node);
>
> - /* Retrieve command line */
> - p = of_get_flat_dt_prop(node, "bootargs", &l);
> - if (p != NULL && l > 0)
> - strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
> -
> - /*
> - * CONFIG_CMDLINE is meant to be a default in case nothing else
> - * managed to set the command line, unless CONFIG_CMDLINE_FORCE
> - * is set in which case we override whatever was found earlier.
> - */
> -#ifdef CONFIG_CMDLINE
> -#ifndef CONFIG_CMDLINE_FORCE
> - if (!((char *)data)[0])
> -#endif
> - strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> -#endif /* CONFIG_CMDLINE */
> + /* Retrieve command line unless forcing */
> + if (read_dt_cmdline) {
> + p = of_get_flat_dt_prop(node, "bootargs", &l);
> + if (p != NULL && l > 0) {
> + if (concat_cmdline) {
> + strlcat(data, " ", COMMAND_LINE_SIZE);
> + strlcat(data, p, min_t(int, (int)l,
> + COMMAND_LINE_SIZE));
> + } else
> + strlcpy(data, p, min_t(int, (int)l,
> + COMMAND_LINE_SIZE));
> + }
> + }
>
> pr_debug("Command line is: %s\n", (char*)data);
>
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index ed136ad..346d6c7 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -91,6 +91,25 @@ extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
> extern int of_flat_dt_match(unsigned long node, const char *const *matches);
> extern unsigned long of_get_flat_dt_root(void);
>
> +/*
> + * early_init_dt_scan_chosen - scan the device tree for ramdisk and bootargs
> + *
> + * The boot arguments will be placed into the memory pointed to by @data.
> + * That memory should be COMMAND_LINE_SIZE big and initialized to be a valid
> + * (possibly empty) string. Logic for what will be in @data after this
> + * function finishes:
> + *
> + * - CONFIG_CMDLINE_FORCE=true
> + * CONFIG_CMDLINE
> + * - CONFIG_CMDLINE_EXTEND=true
> + * CONFIG_CMDLINE + dt bootargs (even if dt bootargs are empty)
> + * - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=non-empty:
> + * dt bootargs
> + * - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is non-empty string
> + * @data is left unchanged
> + * - CMDLINE_FROM_BOOTLOADER=true, dt bootargs=empty, @data is empty string
> + * CONFIG_CMDLINE (or "" if that's not defined)
> + */
> extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
> int depth, void *data);
> extern void early_init_dt_check_for_initrd(unsigned long node);
--
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