Hi,
On 8/20/25 11:48, Marco Felsch wrote:
> Cache the FIT image fit_open() calls to avoid loading the same FIT image
> twice. This is very useful if the same FIT image is used to provide the
> base devicetree, kernel and initrd as well as devicetree overlays.
Just curious, how much time does this save?
Cheers,
Ahmad
>
> Signed-off-by: Marco Felsch <m.fel...@pengutronix.de>
> ---
> common/image-fit.c | 32 ++++++++++++++++++++++++++++++++
> include/image-fit.h | 4 ++++
> 2 files changed, 36 insertions(+)
>
> diff --git a/common/image-fit.c b/common/image-fit.c
> index
> c9d08d25f723665e5203d8e8372255a39bf739de..2cde844e46a61f412a46c2c7bb79d833153e5344
> 100644
> --- a/common/image-fit.c
> +++ b/common/image-fit.c
> @@ -16,6 +16,7 @@
> #include <fs.h>
> #include <malloc.h>
> #include <linux/ctype.h>
> +#include <linux/refcount.h>
> #include <asm/byteorder.h>
> #include <errno.h>
> #include <linux/err.h>
> @@ -33,6 +34,8 @@
> #define CHECK_LEVEL_SIG 2
> #define CHECK_LEVEL_MAX 3
>
> +static LIST_HEAD(open_fits);
> +
> static uint32_t dt_struct_advance(struct fdt_header *f, uint32_t dt, int
> size)
> {
> dt += size;
> @@ -902,6 +905,18 @@ void *fit_open_configuration(struct fit_handle *handle,
> const char *name,
> return conf_node;
> }
>
> +static struct fit_handle *fit_get_handle(const char *filename)
> +{
> + struct fit_handle *handle;
> +
> + list_for_each_entry(handle, &open_fits, entry) {
> + if (!strcmp(filename, handle->filename))
> + return handle;
> + }
> +
> + return NULL;
> +}
> +
> static int fit_do_open(struct fit_handle *handle)
> {
> const char *desc = "(no description)";
> @@ -951,6 +966,8 @@ struct fit_handle *fit_open_buf(const void *buf, size_t
> size, bool verbose,
> handle->size = size;
> handle->verify = verify;
>
> + refcount_set(&handle->users, 1);
> +
> ret = fit_do_open(handle);
> if (ret) {
> fit_close(handle);
> @@ -985,6 +1002,12 @@ struct fit_handle *fit_open(const char *_filename, bool
> verbose,
> return ERR_PTR(-errno);
> }
>
> + handle = fit_get_handle(filename);
> + if (handle) {
> + refcount_inc(&handle->users);
> + return handle;
> + }
> +
> handle = xzalloc(sizeof(struct fit_handle));
>
> handle->verbose = verbose;
> @@ -1002,6 +1025,9 @@ struct fit_handle *fit_open(const char *_filename, bool
> verbose,
> handle->fit = handle->fit_alloc;
> handle->filename = filename;
>
> + refcount_set(&handle->users, 1);
> + list_add(&handle->entry, &open_fits);
> +
> ret = fit_do_open(handle);
> if (ret) {
> fit_close(handle);
> @@ -1013,9 +1039,15 @@ struct fit_handle *fit_open(const char *_filename,
> bool verbose,
>
> static void __fit_close(struct fit_handle *handle)
> {
> + if (!refcount_dec_and_test(&handle->users))
> + return;
> +
> if (handle->root)
> of_delete_node(handle->root);
>
> + if (handle->filename)
> + list_del(&handle->entry);
> +
> free(handle->filename);
> free(handle->fit_alloc);
> }
> diff --git a/include/image-fit.h b/include/image-fit.h
> index
> 68f70f4365cb7a650596263086f7de2209d5957e..f9791ff251c554eda56bf3af98c8abceb056a176
> 100644
> --- a/include/image-fit.h
> +++ b/include/image-fit.h
> @@ -7,6 +7,7 @@
> #define __IMAGE_FIT_H__
>
> #include <linux/types.h>
> +#include <linux/refcount.h>
> #include <bootm.h>
>
> struct fit_handle {
> @@ -15,6 +16,9 @@ struct fit_handle {
> size_t size;
> char *filename;
>
> + struct list_head entry;
> + refcount_t users;
> +
> bool verbose;
> enum bootm_verify verify;
>
>
--
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