Fix simulation of multi-memory systems

When the runtime is initialized it needs to advertise the available
devices. For hardware this is fine because we can query the hardware
via PCIe, but for the simulation flow we don't know what the board
should look like until we receive an aocx file. To work around this
restriction, we initialize the simulation flow using the autodiscovery
string for the a10gx board. This is often fine, but in cases where we
want to simulate a board with more memory systems we will encounter an
issue. In particular, targeting different `buffer_location`s in the
source will often result in this assertion:

```
/src/acl_device_op.cpp:677: int l_is_noop_migration(acl_device_op_t*): Assertion `src_mem->reserved_allocations[dest_device].size() > dest_mem_id' failed.
```

Ideally we would want to allocate this space dynamically based on the
.aocx file; however, we get the .aocx file quite late for simulation
flow, after we have already created buffers.

Author: bsyrowik

CHANGELOG.md

@@ -8,9 +8,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Deprecated
 ### Removed
 ### Fixed
+
+- Simulation of systems with multiple global memories ([#29]).
+
 ### Security
 
 [Unreleased]: https://github.com/intel/fpga-runtime-for-opencl/compare/v2022.1...HEAD
+[#29]: https://github.com/intel/fpga-runtime-for-opencl/pull/29
 
 ## [2022.1] - 2021-12-01
 

src/acl_mem.cpp

@@ -4408,6 +4408,15 @@ void acl_resize_reserved_allocations_for_device(cl_mem mem,
   unsigned int num_global_mem_systems =
       def.autodiscovery_def.num_global_mem_systems;
 
+  // For the simulation flow we don't know how many memory systems will exist
+  // until we load the .aocx, which may not happen until somewhat later.
+  // Reserving space is quite cheap, so reserve space for many memory systems.
+  int offline_mode = 0;
+  (void)acl_get_offline_device_user_setting(&offline_mode);
+  if (offline_mode == ACL_CONTEXT_MPSIM) {
+    num_global_mem_systems = std::max(num_global_mem_systems, 128u);
+  }
+
 #ifdef MEM_DEBUG_MSG
   printf(
       "resizing reserved_allocations, physical_device_id:%u, target_size:%u \n",