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[lib][fdtwalk] skip scanning pci busses marked 'disabled'

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Travis Geiselbrecht
2024-06-19 16:17:13 -07:00
parent e3a5f9c363
commit bd423cad4d
2 changed files with 14 additions and 2 deletions
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1
dev/bus/pci/bus_mgr/bus_mgr.cpp
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@@ -142,6 +142,7 @@ status_t pci_bus_mgr_init() {
// TODO: deal with root bus not having reference to bridge device
status_t err = bus::probe(loc, nullptr, &b, true);
if (err < 0) {
printf("PCI: failed to probe bus, error %d\n", err);
return err;
}

15
lib/fdtwalk/fdtwalk.cpp
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@@ -338,9 +338,20 @@ status_t fdt_walk_find_pcie_info(const void *fdt, struct fdt_walk_pcie_info *inf
auto walker = [info, info_len, &count](const fdt_walk_state &state, const char *name) {
/* look for a pcie leaf and pass the address of the ecam and other info to the callback */
if (*count < info_len && (strncmp(name, "pcie@", 5) == 0 || strncmp(name, "pci@", 4) == 0)) {
/* find the range of the ecam */
int lenp;
const uint8_t *prop_ptr = (const uint8_t *)fdt_getprop(state.fdt, state.offset, "reg", &lenp);
/* check the status, is it disabled? */
const uint8_t *prop_ptr = (const uint8_t *)fdt_getprop(state.fdt, state.offset, "status", &lenp);
if (prop_ptr) {
if (fdt_stringlist_contains((const char *)prop_ptr, lenp, "disabled")) {
LTRACEF("found disabled pci node\n");
return;
}
}
/* find the range of the ecam */
prop_ptr = (const uint8_t *)fdt_getprop(state.fdt, state.offset, "reg", &lenp);
LTRACEF("%p, lenp %u\n", prop_ptr, lenp);
if (prop_ptr) {
LTRACEF_LEVEL(2, "found '%s' prop 'reg' len %d, ac %u, sc %u\n", name, lenp,