Add some AHCI debugging dumps

src/kernel/ahci/hba.cpp

@@ -62,6 +62,8 @@ hba::hba(pci_device *device)
 	device_manager &dm = device_manager::get();
 
 	uint32_t bar5 = device->get_bar(5);
+	log::debug(logs::driver, "HBA raw BAR5 is %08lx", bar5);
+
 	m_data = reinterpret_cast<hba_data *>(bar5 & ~0xfffull);
 	pm->map_offset_pointer(reinterpret_cast<void **>(&m_data), 0x2000);
 
@@ -93,6 +95,7 @@ hba::hba(pci_device *device)
 		m_data->host_control |= 0x02; // enable interrupts
 	}
 
+	dump();
 	for (auto &p : m_ports) {
 		if (!p.active()) continue;
 

src/kernel/ahci/port.cpp

@@ -301,11 +301,17 @@ port::read_async(uint64_t offset, size_t length, void *dest)
 size_t
 port::read(uint64_t offset, size_t length, void *dest)
 {
+	dump();
 	int slot = read_async(offset, length, dest);
+	dump();
 
 	int timeout = 0;
 	while (m_pending[slot].type == command_type::read) {
-		if (timeout++ > 10) return 0;
+		if (timeout++ > 5) {
+			m_hba->dump();
+			dump();
+			return 0;
+		}
 		asm("hlt");
 	}
 	kassert(m_pending[slot].type == command_type::finished,

src/kernel/pci.cpp

@@ -97,9 +97,12 @@ pci_device::pci_device(pci_group &group, uint8_t bus, uint8_t device, uint8_t fu
 	uint16_t *command = reinterpret_cast<uint16_t *>(&m_base[1]);
 	*command |= 0x400; // Mask old INTx style interrupts
 
+	uint16_t *status = command + 1;
+
 	log::info(logs::device, "Found PCIe device at %02d:%02d:%d of type %d.%d id %04x:%04x",
 			bus, device, func, m_class, m_subclass, m_vendor, m_device);
 
+	if (*status & 0x0010) {
 		// Walk the extended capabilities list
 		uint8_t next = m_base[13] & 0xff;
 		while (next) {
@@ -115,6 +118,7 @@ pci_device::pci_device(pci_group &group, uint8_t bus, uint8_t device, uint8_t fu
 			}
 		}
 	}
+}
 
 uint32_t
 pci_device::get_bar(unsigned i)