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boot: Implement a priority for global bootmeths

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Allow bootmeths to select when they want to run, using the bootdev
priority. Provide a new bootmeth_glob_allowed() function which checks if
a bootmeth is ready to use.

Fix a comment in bootflow_system() which is a test for global bootmeths.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-09-27 13:53:41 -06:00
parent 1c54931b8e
commit db66d8d149
3 changed files with 16 additions and 5 deletions
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15
boot/bootflow.c
View File

@@ -251,17 +251,24 @@ static void scan_next_in_uclass(struct udevice **devp)
* bootmeth_glob_allowed() - Check if a global bootmeth is usable at this point
*
* @iter: Bootflow iterator being used
* Return: true if the global bootmeth has not already been used
* Return: true if the global bootmeth has a suitable priority and has not
* already been used
*/
static bool bootmeth_glob_allowed(struct bootflow_iter *iter, int meth_seq)
{
struct udevice *meth = iter->method_order[meth_seq];
bool done = iter->methods_done & BIT(meth_seq);
struct bootmeth_uc_plat *ucp;
log_debug("considering glob '%s': done %d\n", meth->name, done);
ucp = dev_get_uclass_plat(meth);
log_debug("considering glob '%s': done %d glob_prio %d\n", meth->name,
done, ucp->glob_prio);
/* if this one has already been used, try the next */
if (done)
/*
* if this one has already been used, or its priority is too low, try
* the next
*/
if (done || ucp->glob_prio > iter->cur_prio)
return false;
return true;

2
include/bootflow.h
View File

@@ -275,7 +275,7 @@ enum {
* appear first, then the global ones, if any
* @have_global: true if we have global bootmeths in @method_order[]
* @doing_global: true if we are iterating through the global bootmeths (which
* happens before the normal ones)
* generally happens before the normal ones)
* @method_flags: flags controlling which methods should be used for this @dev
* (enum bootflow_meth_flags_t)
* @methods_done: indicates which methods have been processed, one bit for

4
include/bootmeth.h
View File

@@ -30,10 +30,14 @@ enum bootmeth_flags {
*
* @desc: A long description of the bootmeth
* @flags: Flags for this bootmeth (enum bootmeth_flags)
* @glob_prio: Priority for this bootmeth. If unset (0) the bootmeth is started
* before all other bootmeths. Otherwise it is started before the iteration
* reaches the given priority.
*/
struct bootmeth_uc_plat {
const char *desc;
int flags;
enum bootdev_prio_t glob_prio;
};
/** struct bootmeth_ops - Operations for boot methods */