Allow options to be passed when creating an instance of the nvpci interface

Signed-off-by: Christopher Desiniotis <cdesiniotis@nvidia.com>

pkg/nvmdev/nvmdev.go

@@ -380,5 +380,7 @@ func (p *ParentDevice) GetAvailableMDEVInstances(mdevType string) (int, error) {
 func newNvidiaPCIDeviceFromPath(devicePath string) (*nvpci.NvidiaPCIDevice, error) {
 	root := filepath.Dir(devicePath)
 	address := filepath.Base(devicePath)
-	return nvpci.NewFrom(root).GetGPUByPciBusID(address)
+	return nvpci.New(
+		nvpci.WithPCIDevicesRoot(root),
+	).GetGPUByPciBusID(address)
 }

pkg/nvpci/mock.go

@@ -44,7 +44,7 @@ func NewMockNvpci() (mock *MockNvpci, rerr error) {
 	}()
 
 	mock = &MockNvpci{
-		NewFrom(rootDir).(*nvpci),
+		New(WithPCIDevicesRoot(rootDir)).(*nvpci),
 	}
 
 	return mock, nil

pkg/nvpci/nvpci.go

@@ -65,6 +65,7 @@ type ResourceInterface interface {
 
 type nvpci struct {
 	pciDevicesRoot string
+	pcidbPath      string
 }
 
 var _ Interface = (*nvpci)(nil)
@@ -124,14 +125,33 @@ func (d *NvidiaPCIDevice) Reset() error {
 }
 
 // New interface that allows us to get a list of all NVIDIA PCI devices
-func New() Interface {
-	return NewFrom(PCIDevicesRoot)
+func New(opts ...Option) Interface {
+	n := &nvpci{}
+	for _, opt := range opts {
+		opt(n)
+	}
+	if n.pciDevicesRoot == "" {
+		n.pciDevicesRoot = PCIDevicesRoot
+	}
+	return n
 }
 
-// NewFrom interface allows us to get a list of all NVIDIA PCI devices at a specific root directory
-func NewFrom(root string) Interface {
-	return &nvpci{
-		pciDevicesRoot: root,
+// Option defines a function for passing options to the New() call
+type Option func(*nvpci)
+
+// WithPCIDevicesRoot provides an Option to set the root path
+// for PCI devices on the system.
+func WithPCIDevicesRoot(root string) Option {
+	return func(n *nvpci) {
+		n.pciDevicesRoot = root
+	}
+}
+
+// WithPCIDatabasePath provides an Option to set the path
+// to the pciids database file.
+func WithPCIDatabasePath(path string) Option {
+	return func(n *nvpci) {
+		n.pcidbPath = path
 	}
 }