| 1 | /******************************************************************************* |
| 2 | * Copyright (c) 2015 Ericsson |
| 3 | * |
| 4 | * All rights reserved. This program and the accompanying materials |
| 5 | * are made available under the terms of the Eclipse Public License v1.0 |
| 6 | * which accompanies this distribution, and is available at |
| 7 | * http://www.eclipse.org/legal/epl-v10.html |
| 8 | * |
| 9 | * Contributors: |
| 10 | * Matthew Khouzam - Initial API and implementation |
| 11 | *******************************************************************************/ |
| 12 | |
| 13 | package org.eclipse.tracecompass.internal.analysis.os.linux.core.kernel.handlers; |
| 14 | |
| 15 | import java.util.List; |
| 16 | |
| 17 | import org.eclipse.jdt.annotation.Nullable; |
| 18 | import org.eclipse.tracecompass.analysis.os.linux.core.kernel.StateValues; |
| 19 | import org.eclipse.tracecompass.analysis.os.linux.core.trace.IKernelAnalysisEventLayout; |
| 20 | import org.eclipse.tracecompass.statesystem.core.ITmfStateSystemBuilder; |
| 21 | import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException; |
| 22 | import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue; |
| 23 | import org.eclipse.tracecompass.statesystem.core.statevalue.TmfStateValue; |
| 24 | import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; |
| 25 | |
| 26 | /** |
| 27 | * Soft Irq exit handler |
| 28 | */ |
| 29 | public class SoftIrqExitHandler extends KernelEventHandler { |
| 30 | |
| 31 | /** |
| 32 | * Constructor |
| 33 | * |
| 34 | * @param layout |
| 35 | * event layout |
| 36 | */ |
| 37 | public SoftIrqExitHandler(IKernelAnalysisEventLayout layout) { |
| 38 | super(layout); |
| 39 | } |
| 40 | |
| 41 | @Override |
| 42 | public void handleEvent(ITmfStateSystemBuilder ss, ITmfEvent event) throws AttributeNotFoundException { |
| 43 | Integer cpu = KernelEventHandlerUtils.getCpu(event); |
| 44 | if (cpu == null) { |
| 45 | return; |
| 46 | } |
| 47 | |
| 48 | Integer softIrqId = ((Long) event.getContent().getField(getLayout().fieldVec()).getValue()).intValue(); |
| 49 | int currentThreadNode = KernelEventHandlerUtils.getCurrentThreadNode(cpu, ss); |
| 50 | /* Put this SoftIRQ back to inactive (= -1) in the resource tree */ |
| 51 | int quark = ss.getQuarkRelativeAndAdd(KernelEventHandlerUtils.getNodeSoftIRQs(cpu, ss), softIrqId.toString()); |
| 52 | long timestamp = KernelEventHandlerUtils.getTimestamp(event); |
| 53 | if (isSoftIrqRaised(ss.queryOngoingState(quark))) { |
| 54 | ss.modifyAttribute(timestamp, StateValues.SOFT_IRQ_RAISED_VALUE, quark); |
| 55 | } else { |
| 56 | ss.modifyAttribute(timestamp, TmfStateValue.nullValue(), quark); |
| 57 | } |
| 58 | List<Integer> softIrqs = ss.getSubAttributes(ss.getParentAttributeQuark(quark), false); |
| 59 | /* Only set status to running and no exit if ALL softirqs are exited. */ |
| 60 | for (Integer softIrq : softIrqs) { |
| 61 | if (!ss.queryOngoingState(softIrq).isNull()) { |
| 62 | return; |
| 63 | } |
| 64 | } |
| 65 | /* Set the previous process back to running */ |
| 66 | KernelEventHandlerUtils.setProcessToRunning(timestamp, currentThreadNode, ss); |
| 67 | |
| 68 | /* Set the CPU status back to "busy" or "idle" */ |
| 69 | KernelEventHandlerUtils.cpuExitInterrupt(timestamp, cpu, ss); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * This checks if the running <stong>bit</strong> is set |
| 74 | * |
| 75 | * @param state |
| 76 | * the state to check |
| 77 | * @return true if in a softirq. The softirq may be pre-empted by an irq |
| 78 | */ |
| 79 | private static boolean isSoftIrqRaised(@Nullable ITmfStateValue state) { |
| 80 | return (state != null && |
| 81 | !state.isNull() && |
| 82 | (state.unboxInt() & StateValues.CPU_STATUS_SOFT_IRQ_RAISED) == StateValues.CPU_STATUS_SOFT_IRQ_RAISED); |
| 83 | } |
| 84 | |
| 85 | } |