1/*
2 * Copyright (c) 2013, 2018-2019 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Stan Czerniawski
38 */
39
40#include "dev/arm/smmu_v3_cmdexec.hh"
41
42#include "base/bitfield.hh"
43#include "dev/arm/smmu_v3.hh"
44
45void
46SMMUCommandExecProcess::main(Yield &yield)
47{
48 SMMUAction a;
49 a.type = ACTION_INITIAL_NOP;
50 a.pkt = NULL;
51 a.ifc = nullptr;
52 a.delay = 0;
53 yield(a);
54
55 while (true) {
56 busy = true;
57
58 while (true) {
59 int sizeMask =
60 mask(smmu.regs.cmdq_base & Q_BASE_SIZE_MASK) & Q_CONS_PROD_MASK;
61
62 if ((smmu.regs.cmdq_cons & sizeMask) ==
63 (smmu.regs.cmdq_prod & sizeMask))
64 break; // command queue empty
65
66 Addr cmdAddr =
67 (smmu.regs.cmdq_base & Q_BASE_ADDR_MASK) +
68 (smmu.regs.cmdq_cons & sizeMask) * sizeof(SMMUCommand);
69
70 // This deliberately resets the error field in cmdq_cons!
71 smmu.regs.cmdq_cons = (smmu.regs.cmdq_cons + 1) & sizeMask;
72
73 doRead(yield, cmdAddr, &cmd, sizeof(SMMUCommand));
74 smmu.processCommand(cmd);
75 }
76
77 busy = false;
78 // No more commands to process, signal the SMMU as drained
79 smmu.signalDrainDone();
80
81 doSleep(yield);
82 }
83}