On 09/07/18 01:00, AKASHI Takahiro wrote:
> These functions will be used later to handle kexec-specific properties
> in arm64's kexec_file implementation.
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Frank Rowand <frowand.list@xxxxxxxxx>
> ---
> drivers/of/fdt.c | 62 ++++++++++++++++++++++++++++++++++++++++--
> include/linux/of_fdt.h | 10 +++++--
> 2 files changed, 68 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 800ad252cf9c..dc960cea1355 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -25,6 +25,7 @@
> #include <linux/debugfs.h>
> #include <linux/serial_core.h>
> #include <linux/sysfs.h>
> +#include <linux/types.h>
>
> #include <asm/setup.h> /* for COMMAND_LINE_SIZE */
> #include <asm/page.h>
> @@ -537,8 +538,8 @@ void *of_fdt_unflatten_tree(const unsigned long *blob,
> EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
>
> /* Everything below here references initial_boot_params directly. */
> -int __initdata dt_root_addr_cells;
> -int __initdata dt_root_size_cells;
> +int dt_root_addr_cells;
> +int dt_root_size_cells;
>
> void *initial_boot_params;
>
> @@ -1323,3 +1324,60 @@ late_initcall(of_fdt_raw_init);
> #endif
>
> #endif /* CONFIG_OF_EARLY_FLATTREE */
> +
Please add comment:
/* helper functions for arm64 kexec */
> +bool of_fdt_cells_size_fitted(u64 base, u64 size)
Please rename as of_fdt_range_valid()
> +{
> + /* if *_cells >= 2, cells can hold 64-bit values anyway */
> + if ((dt_root_addr_cells == 1) && (base > U32_MAX))
> + return false;
> +
> + if ((dt_root_size_cells == 1) && (size > U32_MAX))
> + return false;
Should also check that base + size does not wrap around.
> +
> + return true;
> +}
> +
> +size_t of_fdt_reg_cells_size(void)
Please rename as of_fdt_root_range_size()
> +{
> + return (dt_root_addr_cells + dt_root_size_cells) * sizeof(u32);
> +}
> +
> +#define FDT_ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1))
> +#define FDT_TAGALIGN(x) (FDT_ALIGN((x), FDT_TAGSIZE))
> +
> +int fdt_prop_len(const char *prop_name, int len)
Please rename as fdt_len_added_prop()
> +{
> + return (strlen(prop_name) + 1) +
> + sizeof(struct fdt_property) +
> + FDT_TAGALIGN(len);
> +}
> +
Please add comment, something like:
/* cells must be 1 or 2 */
> +static void fill_property(void *buf, u64 val64, int cells)
Please rename as cpu64_to_fdt_cells()
Thanks,
Frank
> +{
> + __be32 val32;
> +
> + while (cells) {
> + val32 = cpu_to_fdt32((val64 >> (32 * (--cells))) & U32_MAX);
> + memcpy(buf, &val32, sizeof(val32));
> + buf += sizeof(val32);
> + }
> +}
> +
> +int fdt_setprop_reg(void *fdt, int nodeoffset, const char *name,
> + u64 addr, u64 size)
> +{
> + char buf[sizeof(__be32) * 2 * 2];
> + /* assume dt_root_[addr|size]_cells <= 2 */
> + void *prop;
> + size_t buf_size;
> +
> + buf_size = of_fdt_reg_cells_size();
> + prop = buf;
> +
> + fill_property(prop, addr, dt_root_addr_cells);
> + prop += dt_root_addr_cells * sizeof(u32);
> +
> + fill_property(prop, size, dt_root_size_cells);
> +
> + return fdt_setprop(fdt, nodeoffset, name, buf, buf_size);
> +}
> diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
> index b9cd9ebdf9b9..9615d6142578 100644
> --- a/include/linux/of_fdt.h
> +++ b/include/linux/of_fdt.h
> @@ -37,8 +37,8 @@ extern void *of_fdt_unflatten_tree(const unsigned long *blob,
> struct device_node **mynodes);
>
> /* TBD: Temporary export of fdt globals - remove when code fully merged */
> -extern int __initdata dt_root_addr_cells;
> -extern int __initdata dt_root_size_cells;
> +extern int dt_root_addr_cells;
> +extern int dt_root_size_cells;
> extern void *initial_boot_params;
>
> extern char __dtb_start[];
> @@ -108,5 +108,11 @@ static inline void unflatten_device_tree(void) {}
> static inline void unflatten_and_copy_device_tree(void) {}
> #endif /* CONFIG_OF_EARLY_FLATTREE */
>
> +bool of_fdt_cells_size_fitted(u64 base, u64 size);
> +size_t of_fdt_reg_cells_size(void);
> +int fdt_prop_len(const char *prop_name, int len);
> +int fdt_setprop_reg(void *fdt, int nodeoffset, const char *name,
> + u64 addr, u64 size);
> +
> #endif /* __ASSEMBLY__ */
> #endif /* _LINUX_OF_FDT_H */
>
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