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authorCurtis Dunham <Curtis.Dunham@arm.com>2017-02-14 15:09:18 -0600
committerCurtis Dunham <Curtis.Dunham@arm.com>2017-02-14 15:09:18 -0600
commit0edf6dc9560364691ca0d359ab8321b936f0ec85 (patch)
treea712a0487f7f024d9c329c2bb427c71a827cfa1d /src/arch/arm
parent41beacce088e8f682a0e8ac48f22a3fa4805a43b (diff)
downloadgem5-0edf6dc9560364691ca0d359ab8321b936f0ec85.tar.xz
arm, kvm: implement MuxingKvmGic
This device allows us to, when KVM support is detected and compiled in, instantiate the same Gic device whether the actual simulation is with KVM cores or simulated cores. Checkpointing is not yet supported. Change-Id: I67e4e0b6fb7ab5058e52c933f4f3d8e7ab24981e Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Diffstat (limited to 'src/arch/arm')
-rw-r--r--src/arch/arm/kvm/KvmGic.py8
-rw-r--r--src/arch/arm/kvm/gic.cc149
-rw-r--r--src/arch/arm/kvm/gic.hh47
3 files changed, 200 insertions, 4 deletions
diff --git a/src/arch/arm/kvm/KvmGic.py b/src/arch/arm/kvm/KvmGic.py
index 9ae52db22..d4cbd6c8b 100644
--- a/src/arch/arm/kvm/KvmGic.py
+++ b/src/arch/arm/kvm/KvmGic.py
@@ -1,4 +1,4 @@
-# Copyright (c) 2015 ARM Limited
+# Copyright (c) 2015, 2017 ARM Limited
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
@@ -38,7 +38,7 @@
from m5.params import *
from m5.proxy import *
-from Gic import BaseGic
+from Gic import BaseGic, Pl390
from KvmVM import KvmVM
from System import System
@@ -52,3 +52,7 @@ class KvmGic(BaseGic):
system = Param.System(Parent.any,
'System this interrupt controller belongs to')
+
+class MuxingKvmGic(Pl390):
+ type = 'MuxingKvmGic'
+ cxx_header = "arch/arm/kvm/gic.hh"
diff --git a/src/arch/arm/kvm/gic.cc b/src/arch/arm/kvm/gic.cc
index c5a30879c..7bc1ba59f 100644
--- a/src/arch/arm/kvm/gic.cc
+++ b/src/arch/arm/kvm/gic.cc
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2016 ARM Limited
+ * Copyright (c) 2015-2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -35,14 +35,17 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
+ * Curtis Dunham
*/
#include "arch/arm/kvm/gic.hh"
#include <linux/kvm.h>
+#include "arch/arm/kvm/base_cpu.hh"
#include "debug/Interrupt.hh"
#include "params/KvmGic.hh"
+#include "params/MuxingKvmGic.hh"
KvmKernelGicV2::KvmKernelGicV2(KvmVM &_vm, Addr cpu_addr, Addr dist_addr,
unsigned it_lines)
@@ -183,3 +186,147 @@ KvmGicParams::create()
{
return new KvmGic(this);
}
+
+
+MuxingKvmGic::MuxingKvmGic(const MuxingKvmGicParams *p)
+ : Pl390(p),
+ system(*p->system),
+ kernelGic(nullptr),
+ usingKvm(false)
+{
+ if (auto vm = system.getKvmVM()) {
+ kernelGic = new KvmKernelGicV2(*vm, p->cpu_addr, p->dist_addr,
+ p->it_lines);
+ }
+}
+
+MuxingKvmGic::~MuxingKvmGic()
+{
+}
+
+void
+MuxingKvmGic::startup()
+{
+ usingKvm = (kernelGic != nullptr) && validKvmEnvironment();
+}
+
+void
+MuxingKvmGic::drainResume()
+{
+ bool use_kvm = (kernelGic != nullptr) && validKvmEnvironment();
+ if (use_kvm != usingKvm) {
+ if (use_kvm) // from simulation to KVM emulation
+ fromPl390ToKvm();
+ else // from KVM emulation to simulation
+ fromKvmToPl390();
+
+ usingKvm = use_kvm;
+ }
+}
+
+void
+MuxingKvmGic::serialize(CheckpointOut &cp) const
+{
+ if (!usingKvm)
+ return Pl390::serialize(cp);
+
+ panic("Checkpointing unsupported\n");
+}
+
+void
+MuxingKvmGic::unserialize(CheckpointIn &cp)
+{
+ if (!usingKvm)
+ return Pl390::unserialize(cp);
+
+ panic("Checkpointing unsupported\n");
+}
+
+Tick
+MuxingKvmGic::read(PacketPtr pkt)
+{
+ if (!usingKvm)
+ return Pl390::read(pkt);
+
+ panic("MuxingKvmGic: PIO from gem5 is currently unsupported\n");
+}
+
+Tick
+MuxingKvmGic::write(PacketPtr pkt)
+{
+ if (!usingKvm)
+ return Pl390::write(pkt);
+
+ panic("MuxingKvmGic: PIO from gem5 is currently unsupported\n");
+}
+
+void
+MuxingKvmGic::sendInt(uint32_t num)
+{
+ if (!usingKvm)
+ return Pl390::sendInt(num);
+
+ DPRINTF(Interrupt, "Set SPI %d\n", num);
+ kernelGic->setSPI(num);
+}
+
+void
+MuxingKvmGic::clearInt(uint32_t num)
+{
+ if (!usingKvm)
+ return Pl390::clearInt(num);
+
+ DPRINTF(Interrupt, "Clear SPI %d\n", num);
+ kernelGic->clearSPI(num);
+}
+
+void
+MuxingKvmGic::sendPPInt(uint32_t num, uint32_t cpu)
+{
+ if (!usingKvm)
+ return Pl390::sendPPInt(num, cpu);
+ DPRINTF(Interrupt, "Set PPI %d:%d\n", cpu, num);
+ kernelGic->setPPI(cpu, num);
+}
+
+void
+MuxingKvmGic::clearPPInt(uint32_t num, uint32_t cpu)
+{
+ if (!usingKvm)
+ return Pl390::clearPPInt(num, cpu);
+
+ DPRINTF(Interrupt, "Clear PPI %d:%d\n", cpu, num);
+ kernelGic->clearPPI(cpu, num);
+}
+
+bool
+MuxingKvmGic::validKvmEnvironment() const
+{
+ if (system.threadContexts.empty())
+ return false;
+
+ for (auto tc : system.threadContexts) {
+ if (dynamic_cast<BaseArmKvmCPU*>(tc->getCpuPtr()) == nullptr) {
+ return false;
+ }
+ }
+ return true;
+}
+
+void
+MuxingKvmGic::fromPl390ToKvm()
+{
+ panic("Gic multiplexing not implemented.\n");
+}
+
+void
+MuxingKvmGic::fromKvmToPl390()
+{
+ panic("Gic multiplexing not implemented.\n");
+}
+
+MuxingKvmGic *
+MuxingKvmGicParams::create()
+{
+ return new MuxingKvmGic(this);
+}
diff --git a/src/arch/arm/kvm/gic.hh b/src/arch/arm/kvm/gic.hh
index d6922b24b..fc09da6a0 100644
--- a/src/arch/arm/kvm/gic.hh
+++ b/src/arch/arm/kvm/gic.hh
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2016 ARM Limited
+ * Copyright (c) 2015-2017 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -35,6 +35,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Andreas Sandberg
+ * Curtis Dunham
*/
#ifndef __ARCH_ARM_KVM_GIC_HH__
@@ -44,6 +45,7 @@
#include "cpu/kvm/device.hh"
#include "cpu/kvm/vm.hh"
#include "dev/arm/base_gic.hh"
+#include "dev/arm/gic_pl390.hh"
#include "dev/platform.hh"
/**
@@ -205,4 +207,47 @@ class KvmGic : public BaseGic
const AddrRangeList addrRanges;
};
+struct MuxingKvmGicParams;
+
+class MuxingKvmGic : public Pl390
+{
+ public: // SimObject / Serializable / Drainable
+ MuxingKvmGic(const MuxingKvmGicParams *p);
+ ~MuxingKvmGic();
+
+ void startup() override;
+ void drainResume() override;
+
+ void serialize(CheckpointOut &cp) const override;
+ void unserialize(CheckpointIn &cp) override;
+
+ public: // PioDevice
+ Tick read(PacketPtr pkt) override;
+ Tick write(PacketPtr pkt) override;
+
+ public: // Pl390
+ void sendInt(uint32_t num) override;
+ void clearInt(uint32_t num) override;
+
+ void sendPPInt(uint32_t num, uint32_t cpu) override;
+ void clearPPInt(uint32_t num, uint32_t cpu) override;
+
+ protected:
+ /** Verify gem5 configuration will support KVM emulation */
+ bool validKvmEnvironment() const;
+
+ /** System this interrupt controller belongs to */
+ System &system;
+
+ /** Kernel GIC device */
+ KvmKernelGicV2 *kernelGic;
+
+ private:
+ bool usingKvm;
+
+ /** Multiplexing implementation: state transfer functions */
+ void fromPl390ToKvm();
+ void fromKvmToPl390();
+};
+
#endif // __ARCH_ARM_KVM_GIC_HH__