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Message-ID: <8de94c58-ff4c-c896-13d1-016914042068@gmail.com>
Date: Wed, 24 Nov 2021 11:13:08 -0500
From: Frank Rowand <frowand.list@...il.com>
To: Rob Herring <robh@...nel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
John Crispin <john@...ozen.org>,
Michael Ellerman <mpe@...erman.id.au>,
Paul Mackerras <paulus@...ba.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/3] of/fdt: Rework early_init_dt_scan_chosen() to call
directly
On 11/18/21 1:12 PM, Rob Herring wrote:
> Use of the of_scan_flat_dt() function predates libfdt and is discouraged
> as libfdt provides a nicer set of APIs. Rework
> early_init_dt_scan_chosen() to be called directly and use libfdt.
>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> arch/powerpc/kernel/prom.c | 2 +-
> arch/powerpc/mm/nohash/kaslr_booke.c | 4 +--
> drivers/of/fdt.c | 39 ++++++++++++++--------------
> include/linux/of_fdt.h | 3 +--
> 4 files changed, 22 insertions(+), 26 deletions(-)
>
> diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
> index 2e67588f6f6e..c6c398ccd98a 100644
> --- a/arch/powerpc/kernel/prom.c
> +++ b/arch/powerpc/kernel/prom.c
> @@ -402,7 +402,7 @@ static int __init early_init_dt_scan_chosen_ppc(unsigned long node,
> const unsigned long *lprop; /* All these set by kernel, so no need to convert endian */
>
> /* Use common scan routine to determine if this is the chosen node */
> - if (early_init_dt_scan_chosen(node, uname, depth, data) == 0)
> + if (early_init_dt_scan_chosen(data) < 0)
> return 0;
>
> #ifdef CONFIG_PPC64
> diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c b/arch/powerpc/mm/nohash/kaslr_booke.c
> index 8fc49b1b4a91..90debe19ab4c 100644
> --- a/arch/powerpc/mm/nohash/kaslr_booke.c
> +++ b/arch/powerpc/mm/nohash/kaslr_booke.c
> @@ -44,9 +44,7 @@ struct regions __initdata regions;
>
> static __init void kaslr_get_cmdline(void *fdt)
> {
> - int node = fdt_path_offset(fdt, "/chosen");
> -
> - early_init_dt_scan_chosen(node, "chosen", 1, boot_command_line);
> + early_init_dt_scan_chosen(boot_command_line);
> }
>
> static unsigned long __init rotate_xor(unsigned long hash, const void *area,
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index bdca35284ceb..1f1705f76263 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -1124,18 +1124,18 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
> return 0;
> }
>
> -int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> - int depth, void *data)
> +int __init early_init_dt_scan_chosen(char *cmdline)
> {
> - int l;
> + int l, node;
> const char *p;
> const void *rng_seed;
> + const void *fdt = initial_boot_params;
>
> - pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
> -
> - if (depth != 1 || !data ||
> - (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
> - return 0;
> + node = fdt_path_offset(fdt, "/chosen");
> + if (node < 0)
> + node = fdt_path_offset(fdt, "/chosen@0");
> + if (node < 0)
> + return -ENOENT;
>
> early_init_dt_check_for_initrd(node);
> early_init_dt_check_for_elfcorehdr(node);
> @@ -1144,7 +1144,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> /* Retrieve command line */
> p = of_get_flat_dt_prop(node, "bootargs", &l);
> if (p != NULL && l > 0)
> - strlcpy(data, p, min(l, COMMAND_LINE_SIZE));
> + strlcpy(cmdline, p, min(l, COMMAND_LINE_SIZE));
>
> /*
> * CONFIG_CMDLINE is meant to be a default in case nothing else
> @@ -1153,18 +1153,18 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> */
> #ifdef CONFIG_CMDLINE
> #if defined(CONFIG_CMDLINE_EXTEND)
> - strlcat(data, " ", COMMAND_LINE_SIZE);
> - strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> + strlcat(cmdline, " ", COMMAND_LINE_SIZE);
> + strlcat(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> #elif defined(CONFIG_CMDLINE_FORCE)
> - strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> + strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> #else
> /* No arguments from boot loader, use kernel's cmdl*/
> - if (!((char *)data)[0])
> - strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> + if (!((char *)cmdline)[0])
> + strlcpy(cmdline, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
> #endif
> #endif /* CONFIG_CMDLINE */
>
> - pr_debug("Command line is: %s\n", (char *)data);
> + pr_debug("Command line is: %s\n", (char *)cmdline);
>
> rng_seed = of_get_flat_dt_prop(node, "rng-seed", &l);
> if (rng_seed && l > 0) {
> @@ -1178,8 +1178,7 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
> fdt_totalsize(initial_boot_params));
> }
>
> - /* break now */
> - return 1;
> + return 0;
> }
>
> #ifndef MIN_MEMBLOCK_ADDR
> @@ -1261,14 +1260,14 @@ bool __init early_init_dt_verify(void *params)
>
> void __init early_init_dt_scan_nodes(void)
> {
> - int rc = 0;
> + int rc;
>
> /* Initialize {size,address}-cells info */
> of_scan_flat_dt(early_init_dt_scan_root, NULL);
>
> /* Retrieve various information from the /chosen node */
> - rc = of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
> - if (!rc)
> + rc = early_init_dt_scan_chosen(boot_command_line);
> + if (rc)
> pr_warn("No chosen node found, continuing without\n");
>
> /* Setup memory, calling early_init_dt_add_memory_arch */
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index cf48983d3c86..654722235df6 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -58,8 +58,7 @@ extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
> extern unsigned long of_get_flat_dt_root(void);
> extern uint32_t of_get_flat_dt_phandle(unsigned long node);
>
> -extern int early_init_dt_scan_chosen(unsigned long node, const char *uname,
> - int depth, void *data);
> +extern int early_init_dt_scan_chosen(char *cmdline);
> extern int early_init_dt_scan_memory(unsigned long node, const char *uname,
> int depth, void *data);
> extern int early_init_dt_scan_chosen_stdout(void);
>
patch 1/3
Reviewed-by: Frank Rowand <frank.rowand@...y.com>
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