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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/* Copyright 2021 Stewart Smith */
#define pr_fmt(fmt) "HWPROBE: " fmt
#include <skiboot.h>
#include <string.h>
static bool hwprobe_deps_satisfied(const struct hwprobe *hwp)
{
struct hwprobe *hwprobe;
const char **dep;
unsigned int i;
dep = hwp->deps;
if (dep == NULL)
return true;
prlog(PR_TRACE, "Checking deps for %s\n", hwp->name);
while (*dep != NULL) {
prlog(PR_TRACE, "Checking %s dep %s\n", hwp->name, *dep);
hwprobe = &__hwprobes_start;
for (i = 0; &hwprobe[i] < &__hwprobes_end; i++) {
if(strcmp(hwprobe[i].name, *dep) == 0 &&
!hwprobe[i].probed)
return false;
}
dep++;
}
prlog(PR_TRACE, "deps for %s are satisfied!\n", hwp->name);
return true;
}
void probe_hardware(void)
{
struct hwprobe *hwprobe;
unsigned int i;
bool work_todo = true;
bool did_something = true;
while (work_todo) {
work_todo = false;
did_something = false;
hwprobe = &__hwprobes_start;
prlog(PR_DEBUG, "Begin loop\n");
for (i = 0; &hwprobe[i] < &__hwprobes_end; i++) {
if (hwprobe[i].probed)
continue;
if (hwprobe_deps_satisfied(&hwprobe[i])) {
prlog(PR_DEBUG, "Probing %s...\n", hwprobe[i].name);
if (hwprobe[i].probe)
hwprobe[i].probe();
did_something = true;
hwprobe[i].probed = true;
} else {
prlog(PR_DEBUG, "Dependencies for %s not yet satisfied, skipping\n",
hwprobe[i].name);
work_todo = true;
}
}
if (work_todo && !did_something) {
prlog(PR_ERR, "Cannot satisfy dependencies! Bailing out\n");
break;
}
}
}
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