i915: Add I915_PARAM_CHIPSET_ID param to get chipset ID.

shared-core/i915_dma.c

@@ -1210,6 +1210,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
 	case I915_PARAM_LAST_DISPATCH:
 		value = READ_BREADCRUMB(dev_priv);
 		break;
+	case I915_PARAM_CHIPSET_ID:
+		value = dev->pci_device;
+		break;
 	default:
 		DRM_ERROR("Unknown parameter %d\n", param->param);
 		return -EINVAL;

shared-core/i915_drm.h

@@ -232,6 +232,7 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_IRQ_ACTIVE            1
 #define I915_PARAM_ALLOW_BATCHBUFFER     2
 #define I915_PARAM_LAST_DISPATCH         3
+#define I915_PARAM_CHIPSET_ID            4
 
 typedef struct drm_i915_getparam {
 	int param;