dde_kit: upgrade ram support for device iteration

Issue #755

repos/os/src/lib/dde_kit/pci_tree.cc

@@ -58,7 +58,6 @@ Pci_tree::Pci_tree(unsigned device_class, unsigned class_mask)
 	Pci::Device_capability prev_device_cap;
 	Pci::Device_capability device_cap = _pci_drv.first_device(device_class,
 	                                                          class_mask);
-
 	while (device_cap.valid()) {
 
 		Pci_device *device = new (env()->heap()) Pci_device(device_cap);
@@ -66,10 +65,19 @@ Pci_tree::Pci_tree(unsigned device_class, unsigned class_mask)
 		_devices.insert(device);
 
 		prev_device_cap = device_cap;
-		device_cap = _pci_drv.next_device(prev_device_cap, device_class,
-		                                  class_mask);
+
+		for (unsigned i = 0; i < 2; i++) {
+			try {
+				device_cap = _pci_drv.next_device(prev_device_cap, device_class,
+				                                  class_mask);
+				break;
+			} catch (Pci::Device::Quota_exceeded) {
+				Genode::env()->parent()->upgrade(_pci_drv.cap(), "ram_quota=4096");
+			}
+		}
 	}
 
 	if (verbose)
 		_show_devices();
+
 }

repos/os/src/lib/dde_kit/pci_tree.h

@@ -125,8 +125,32 @@ namespace Dde_kit {
 			                                          size_t size)
 			{
 				/* trigger that the device gets assigned to this driver */
-				pci_drv.config_extended(_device);
-				return pci_drv.alloc_dma_buffer(size);
+				for (unsigned i = 0; i < 2; i++) {
+					try {
+						pci_drv.config_extended(_device);
+						break;
+					} catch (Pci::Device::Quota_exceeded) {
+						if (i == 1)
+							return Ram_dataspace_capability();
+						Genode::env()->parent()->upgrade(pci_drv.cap(), "ram_quota=4096");
+					}
+				}
+
+				for (unsigned i = 0; i < 2; i++) {
+					try {
+						return pci_drv.alloc_dma_buffer(size);
+					} catch (Pci::Device::Quota_exceeded) {
+						if (i == 0) {
+							char buf[32];
+							Genode::snprintf(buf, sizeof(buf), "ram_quota=%zd",
+							                 size);
+							Genode::env()->parent()->upgrade(pci_drv.cap(),
+							                                 buf);
+						}
+					}
+				}
+
+				return Ram_dataspace_capability();
 			}
 	};