PCI: Allow initialization to be deferred.

This is for platforms where information from parsed ACPI namespace
is necessary to fully configure PCI subsystem.

Change-Id: I8bdcfab6b99cbe7fdbc902b9fc13b44133325961
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5273
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

src/add-ons/kernel/bus_managers/pci/pci.cpp

@@ -473,14 +473,20 @@ pcirefresh(int argc, char **argv)
 
 // #pragma mark bus manager init/uninit
 
+static bool sInitDone;
+
 
 status_t
-pci_init(void)
+pci_init_deferred(void)
 {
-	gPCI = new PCI;
+	if (sInitDone)
+		return B_OK;
 
-	// pci_controller_init may setup things needed by pci_io_init like mmio addresses
-	if (pci_controller_init() != B_OK) {
+	status_t ret = pci_controller_init();
+	if (ret == B_DEV_NOT_READY)
+		return ret;
+
+	if (ret != B_OK) {
 		TRACE(("PCI: pci_controller_init failed\n"));
 		return B_ERROR;
 	}
@@ -510,13 +516,36 @@ pci_init(void)
 	add_debugger_command("pcistatus", &pcistatus, "dump and clear pci device status registers");
 	add_debugger_command("pcirefresh", &pcirefresh, "refresh and print all pci_info");
 
+	sInitDone = true;
 	return B_OK;
 }
 
 
+status_t
+pci_init(void)
+{
+	gPCI = new PCI;
+
+	status_t ret = pci_init_deferred();
+	if (ret == B_DEV_NOT_READY) {
+		TRACE(("PCI: init deferred\n"));
+		return B_OK;
+	}
+
+	return ret;
+}
+
+
 void
 pci_uninit(void)
 {
+	delete gPCI;
+
+	if (!sInitDone)
+		return;
+
+	sInitDone = false;
+
 	remove_debugger_command("outw", &write_io);
 	remove_debugger_command("out32", &write_io);
 	remove_debugger_command("outs", &write_io);
@@ -533,8 +562,6 @@ pci_uninit(void)
 
 	remove_debugger_command("pcistatus", &pcistatus);
 	remove_debugger_command("pcirefresh", &pcirefresh);
-
-	delete gPCI;
 }
 
 

src/add-ons/kernel/bus_managers/pci/pci.h

@@ -196,6 +196,7 @@ extern "C" {
 #endif
 
 status_t	pci_init(void);
+status_t	pci_init_deferred(void);
 void		pci_uninit(void);
 
 long		pci_get_nth_pci_info(long index, pci_info *outInfo);

src/add-ons/kernel/bus_managers/pci/pci_root.cpp

@@ -130,7 +130,7 @@ pci_root_init(device_node* node, void** _cookie)
 	if (res < B_OK)
 		return res;
 
-	return B_OK;
+	return pci_init_deferred();
 }