dev-amdgpu: Remove unused variables in src/dev/amdgpu

These were causing errors to be thrown when compiling in clang-12.

Change-Id: I8bd2d7e7e1d4423a54766ed906c864bb91e884f0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58149
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matthew Poremba <matthew.poremba@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/dev/amdgpu/amdgpu_device.hh

@@ -121,16 +121,6 @@ class AMDGPUDevice : public PciDevice
     bool checkpoint_before_mmios;
     int init_interrupt_count;
 
-    // GART aperture. This is the initial 1-level privledged page table that
-    // resides in framebuffer memory.
-    uint32_t gartBase = 0x0;
-    uint32_t gartSize = 0x0;
-
-    // MMHUB aperture. These addresses are set by the GPU. For now we wait
-    // until the driver reads them before setting them.
-    uint64_t mmhubBase = 0x0;
-    uint64_t mmhubTop = 0x0;
-
     // VMIDs data structures
     // map of pasids to vmids
     std::unordered_map<uint16_t, uint16_t> idMap;

src/dev/amdgpu/system_hub.cc

@@ -39,7 +39,7 @@ namespace gem5
 void
 AMDGPUSystemHub::sendRequest(PacketPtr pkt, Event *callback)
 {
-    ResponseEvent *dmaRespEvent = new ResponseEvent(pkt, callback);
+    ResponseEvent *dmaRespEvent = new ResponseEvent(callback);
     Tick delay = 0;
 
     // Assuming read XOR write (i.e., not an atomic).
@@ -59,8 +59,8 @@ AMDGPUSystemHub::dmaResponse(PacketPtr pkt)
 {
 }
 
-AMDGPUSystemHub::ResponseEvent::ResponseEvent(PacketPtr pkt, Event *_callback)
-    : reqPkt(pkt), callback(_callback)
+AMDGPUSystemHub::ResponseEvent::ResponseEvent(Event *_callback)
+    : callback(_callback)
 {
     // Delete this event after process is called
     setFlags(Event::AutoDelete);

src/dev/amdgpu/system_hub.hh

@@ -66,11 +66,10 @@ class AMDGPUSystemHub : public DmaDevice
 
     class ResponseEvent : public Event
     {
-       PacketPtr reqPkt;
        Event *callback;
 
        public:
-        ResponseEvent(PacketPtr pkt, Event *_callback);
+        ResponseEvent(Event *_callback);
 
         void process();