AHCI: add MSI support.

src/add-ons/kernel/busses/scsi/ahci/ahci.c

@@ -142,6 +142,7 @@ const device_info kSupportedDevices[] = {
 
 device_manager_info *gDeviceManager;
 scsi_for_sim_interface *gSCSI;
+pci_x86_module_info* gPCIx86Module;
 
 
 status_t
@@ -328,7 +329,17 @@ std_ops(int32 op, ...)
 {
 	switch (op) {
 		case B_MODULE_INIT:
+			if (get_module(B_PCI_X86_MODULE_NAME,
+					(module_info**)&gPCIx86Module) != B_OK) {
+				TRACE("failed to get pci x86 module\n");
+				gPCIx86Module = NULL;
+			}
+			return B_OK;
 		case B_MODULE_UNINIT:
+			if (gPCIx86Module != NULL) {
+				put_module(B_PCI_X86_MODULE_NAME);
+				gPCIx86Module = NULL;
+			}
 			return B_OK;
 
 		default:

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

@@ -29,6 +29,7 @@ AHCIController::AHCIController(device_node *node,
 	fPortCount(0),
 	fPortImplementedMask(0),
 	fIRQ(0),
+	fUseMSI(false),
 	fInstanceCheck(-1)
 {
 	memset(fPort, 0, sizeof(fPort));
@@ -101,6 +102,20 @@ AHCIController::Init()
 	}
 
 	fIRQ = pciInfo.u.h0.interrupt_line;
+	if (gPCIx86Module != NULL && gPCIx86Module->get_msi_count(
+			pciInfo.bus, pciInfo.device, pciInfo.function) >= 1) {
+		uint8 vector;
+		if (gPCIx86Module->configure_msi(pciInfo.bus, pciInfo.device,
+				pciInfo.function, 1, &vector) == B_OK
+			&& gPCIx86Module->enable_msi(pciInfo.bus, pciInfo.device,
+				pciInfo.function) == B_OK) {
+			TRACE("using MSI vector %u\n", vector);
+			fIRQ = vector;
+			fUseMSI = true;
+		} else {
+			TRACE("couldn't use MSI\n");
+		}
+	}	
 	if (fIRQ == 0 || fIRQ == 0xff) {
 		TRACE("Error: PCI IRQ not assigned\n");
 		return B_ERROR;
@@ -250,6 +265,15 @@ AHCIController::Uninit()
   	// well...
   	remove_io_interrupt_handler(fIRQ, Interrupt, this);
 
+	if (fUseMSI && gPCIx86Module != NULL) {
+		pci_info pciInfo;
+		fPCI->get_pci_info(fPCIDevice, &pciInfo);
+		gPCIx86Module->disable_msi(pciInfo.bus,
+			pciInfo.device, pciInfo.function);
+		gPCIx86Module->unconfigure_msi(pciInfo.bus,
+			pciInfo.device, pciInfo.function);
+	}
+
 	delete_area(fRegsArea);
 
 // --- Instance check workaround begin

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

@@ -52,6 +52,7 @@ private:
 	int						fPortCount;
 	uint32					fPortImplementedMask;
 	uint8					fIRQ;
+	bool					fUseMSI;
 	AHCIPort *				fPort[32];
 
 // --- Instance check workaround begin

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

@@ -7,6 +7,7 @@
 
 #include <bus/PCI.h>
 #include <bus/SCSI.h>
+#include <PCI_x86.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -259,6 +260,7 @@ status_t get_device_info(uint16 vendorID, uint16 deviceID, const char **name,
 extern scsi_sim_interface gAHCISimInterface;
 extern device_manager_info *gDeviceManager;
 extern scsi_for_sim_interface *gSCSI;
+extern pci_x86_module_info* gPCIx86Module;
 
 
 #define MAX_SECTOR_LBA_28 ((1ull << 28) - 1)