| Message ID | 20211118181213.1433346-2-robh@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | of/fdt: Rework early FDT scanning functions | expand |
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@ellerman.id.au> > Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> > Cc: Paul Mackerras <paulus@samba.org> > Cc: Frank Rowand <frowand.list@gmail.com> > Cc: linuxppc-dev@lists.ozlabs.org > Signed-off-by: Rob Herring <robh@kernel.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@sony.com>
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);
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@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Frank Rowand <frowand.list@gmail.com> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Rob Herring <robh@kernel.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(-)