gem5  v20.1.0.0
smmu_v3_cmdexec.cc
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37 
39 
40 #include "base/bitfield.hh"
41 #include "dev/arm/smmu_v3.hh"
42 
43 void
45 {
46  SMMUAction a;
47  a.type = ACTION_INITIAL_NOP;
48  a.pkt = NULL;
49  a.ifc = nullptr;
50  a.delay = 0;
51  yield(a);
52 
53  while (true) {
54  busy = true;
55 
56  while (true) {
57  // Masking depending on CMDQ_BASE.LOG2SIZE (log(number of
58  // queue entries)). Example: a value of 0b101 (32 entries)
59  // generates a 0b11111 mask.
60  int size_mask = mask(
62 
63  // In this case the wrap bit is considered (+1)
64  int size_mask_wrap = mask(
66 
67  if ((smmu.regs.cmdq_cons & size_mask_wrap) ==
68  (smmu.regs.cmdq_prod & size_mask_wrap))
69  break; // command queue empty
70 
71  Addr cmd_addr =
73  (smmu.regs.cmdq_cons & size_mask) * sizeof(SMMUCommand);
74 
75  // This deliberately resets the error field in cmdq_cons!
76  smmu.regs.cmdq_cons = (smmu.regs.cmdq_cons + 1) & size_mask_wrap;
77 
78  doRead(yield, cmd_addr, &cmd, sizeof(SMMUCommand));
80  }
81 
82  busy = false;
83  // No more commands to process, signal the SMMU as drained
85 
86  doSleep(yield);
87  }
88 }
SMMURegs::cmdq_base
uint64_t cmdq_base
Definition: smmu_v3_defs.hh:142
ACTION_INITIAL_NOP
@ ACTION_INITIAL_NOP
Definition: smmu_v3_proc.hh:56
SMMUProcess::doSleep
void doSleep(Yield &yield)
Definition: smmu_v3_proc.cc:137
m5::Coroutine::CallerType
CallerType: A reference to an object of this class will be passed to the coroutine task.
Definition: coroutine.hh:83
SMMUv3::regs
SMMURegs regs
Definition: smmu_v3.hh:146
SMMURegs::cmdq_prod
uint32_t cmdq_prod
Definition: smmu_v3_defs.hh:143
smmu_v3_cmdexec.hh
SMMURegs::cmdq_cons
uint32_t cmdq_cons
Definition: smmu_v3_defs.hh:144
Q_BASE_ADDR_MASK
@ Q_BASE_ADDR_MASK
Definition: smmu_v3_defs.hh:93
SMMUCommand
Definition: smmu_v3_defs.hh:348
ArmISA::a
Bitfield< 8 > a
Definition: miscregs_types.hh:62
bitfield.hh
SMMUCommandExecProcess::main
virtual void main(Yield &yield)
Definition: smmu_v3_cmdexec.cc:44
SMMUAction
Definition: smmu_v3_proc.hh:66
SMMUCommandExecProcess::busy
bool busy
Definition: smmu_v3_cmdexec.hh:51
SMMUProcess::doRead
void doRead(Yield &yield, Addr addr, void *ptr, size_t size)
Definition: smmu_v3_proc.cc:69
Drainable::signalDrainDone
void signalDrainDone() const
Signal that an object is drained.
Definition: drain.hh:301
Q_BASE_SIZE_MASK
@ Q_BASE_SIZE_MASK
Definition: smmu_v3_defs.hh:94
Addr
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition: types.hh:142
smmu_v3.hh
SMMUProcess::smmu
SMMUv3 & smmu
Definition: smmu_v3_proc.hh:106
SMMUv3::processCommand
void processCommand(const SMMUCommand &cmd)
Definition: smmu_v3.cc:383
SMMUCommandExecProcess::cmd
SMMUCommand cmd
Definition: smmu_v3_cmdexec.hh:49
ArmISA::mask
Bitfield< 28, 24 > mask
Definition: miscregs_types.hh:711

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