added a workaround to prevent loading the driver multiple times for the same device

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22099 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/busses/scsi/ahci/ahci_controller.cpp

@@ -6,6 +6,7 @@
 #include "ahci_controller.h"
 
 #include <KernelExport.h>
+#include <stdio.h>
 
 #define TRACE(a...) dprintf("\33[34mahci:\33[0m " a)
 #define FLOW(a...)	dprintf("ahci: " a)
@@ -15,18 +16,42 @@ AHCIController::AHCIController(device_node_handle node, pci_device_info *device)
 	: fNode(node)
 	, fPCIDevice(device)
 	, fDevicePresentMask(0)
+ 	, fInstanceCheck(-1)
 {
-	fDevicePresentMask = (1 << 7) | (1 << 19);
+}
 
-	uint16 vendorID = gPCI->read_pci_config(fPCIDevice, PCI_vendor_id, 2);
-	uint16 deviceID = gPCI->read_pci_config(fPCIDevice, PCI_device_id, 2);
 
-	TRACE("AHCIController::AHCIController vendor %04x, device %04x\n",
-		vendorID, deviceID);
+AHCIController::~AHCIController()
+{
+}
+
+
+status_t
+AHCIController::Init()
+{
+	pci_info pciInfo;
+
+	if (gPCI->get_pci_info(fPCIDevice, &pciInfo) < B_OK) {
+		dprintf("AHCIController::Init ERROR: getting PCI info failed!\n");
+		return B_ERROR;
+	}
+
+	TRACE("AHCIController::Init %u:%u:%u vendor %04x, device %04x\n", 
+		pciInfo.bus, pciInfo.device, pciInfo.function, pciInfo.vendor_id, pciInfo.device_id);
+
+// --- Instance check workaround begin
+	char sName[32];
+	snprintf(sName, sizeof(sName), "ahci-inst-%u-%u-%u", pciInfo.bus, pciInfo.device, pciInfo.function);
+	if (find_port(sName) >= 0) {
+		dprintf("AHCIController::Init ERROR: an instance for object %u:%u:%u already exists\n", 
+			pciInfo.bus, pciInfo.device, pciInfo.function);
+		return B_ERROR;
+	}
+	fInstanceCheck = create_port(1, sName);
+// --- Instance check workaround end
 
 	uchar capabilityOffset;
-	status_t res = gPCI->find_pci_capability(fPCIDevice, PCI_cap_id_sata,
-		&capabilityOffset);
+	status_t res = gPCI->find_pci_capability(fPCIDevice, PCI_cap_id_sata, &capabilityOffset);
 	if (res == B_OK) {
 		uint32 satacr0;
 		uint32 satacr1;
@@ -35,11 +60,21 @@ AHCIController::AHCIController(device_node_handle node, pci_device_info *device)
 		satacr1 = gPCI->read_pci_config(fPCIDevice, capabilityOffset + 4, 4);
 		TRACE("satacr0 = 0x%08lx, satacr1 = 0x%08lx\n", satacr0, satacr1);
 	}
+
+	fDevicePresentMask = (1 << 7) | (1 << 19);
+
+	return B_OK;
 }
 
 
-AHCIController::~AHCIController()
+void
+AHCIController::Uninit()
 {
+	TRACE("AHCIController::Uninit\n");
+
+// --- Instance check workaround begin
+	delete_port(fInstanceCheck);
+// --- Instance check workaround end
 }
 
 

src/add-ons/kernel/busses/scsi/ahci/ahci_controller.h

@@ -15,6 +15,9 @@ public:
 					pci_device_info *pciDevice);
 				~AHCIController();
 
+	status_t	Init();
+	void		Uninit();
+
 	void		ExecuteRequest(scsi_ccb *request);
 	uchar		AbortRequest(scsi_ccb *request);
 	uchar		TerminateRequest(scsi_ccb *request);
@@ -29,6 +32,12 @@ private:
 	device_node_handle 			fNode;
 	pci_device_info*			fPCIDevice;
 	uint32						fDevicePresentMask;
+
+
+// --- Instance check workaround begin
+	port_id fInstanceCheck;
+// --- Instance check workaround end
+
 };
 
 

src/add-ons/kernel/busses/scsi/ahci/ahci_sim.cpp

@@ -124,22 +124,30 @@ ahci_ioctl(scsi_sim_cookie cookie, uint8 targetID, uint32 op, void *buffer,
 static status_t
 ahci_sim_init_bus(device_node_handle node, void *userCookie, void **_cookie)
 {
+	pci_device_info *pciDevice;
+	device_node_handle parent;
+	AHCIController *controller;
+	status_t status;
+
 	TRACE("ahci_sim_init_bus, userCookie %p\n", userCookie);
 
-	device_node_handle parent = gDeviceManager->get_parent(node);
-
 	// initialize parent (the bus) to get the PCI interface and device
-	pci_device_info *pciDevice;
-	status_t status = gDeviceManager->init_driver(parent, &pciDevice,
-		NULL, NULL);
+	parent = gDeviceManager->get_parent(node);
+	status = gDeviceManager->init_driver(parent, &pciDevice, NULL, NULL);
+	gDeviceManager->put_device_node(parent);
 	if (status != B_OK)
 		return status;
 
-	gDeviceManager->put_device_node(parent);
-
-	*_cookie = new(std::nothrow) AHCIController(node, pciDevice);
-	if (!*_cookie)
+	controller =  new(std::nothrow) AHCIController(node, pciDevice);
+	if (!controller)
 		return B_NO_MEMORY;
+	status = controller->Init();
+	if (status < B_OK) {
+		delete controller;
+		return status;
+	}
+
+	*_cookie = controller;
 	TRACE("cookie = %p\n", *_cookie);
 	return B_OK;
 }
@@ -153,10 +161,13 @@ ahci_sim_uninit_bus(void *cookie)
 
 	device_node_handle parent = gDeviceManager->get_parent(
 		controller->DeviceNode());
+
+	controller->Uninit();
+	delete controller;
+
 	gDeviceManager->uninit_driver(parent);
 	gDeviceManager->put_device_node(parent);
 
-	delete controller;
 	return B_OK;
 }