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Aligned memory allocation workaround for PACE clusters

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This commit is contained in:
Blaise Tine
2021-03-09 03:25:45 -08:00
parent 66ea340d05
commit c0abd6ef3f
1 changed files with 17 additions and 2 deletions
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19
driver/opae/vlsim/opae_sim.cpp
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@@ -62,8 +62,23 @@ opae_sim::~opae_sim() {
delete vortex_afu_;
}
static void *__aligned_malloc(size_t alignment, size_t size) {
// reserve margin for alignment and storing of unaligned address
size_t margin = (alignment-1) + sizeof(void*);
void *unaligned_addr = malloc(size + margin);
void **aligned_addr = (void**)((uintptr_t)(unaligned_addr + margin) & ~(alignment-1));
aligned_addr[-1] = unaligned_addr;
return aligned_addr;
}
static void __aligned_free(void *ptr) {
// retreive the stored unaligned address and use it to free the allocation
void* unaligned_addr = ((void**)ptr)[-1];
free(unaligned_addr);
}
int opae_sim::prepare_buffer(uint64_t len, void **buf_addr, uint64_t *wsid, int flags) {
auto alloc = aligned_alloc(CACHE_BLOCK_SIZE, len);
auto alloc = __aligned_malloc(CACHE_BLOCK_SIZE, len);
if (alloc == NULL)
return -1;
host_buffer_t buffer;
@@ -80,7 +95,7 @@ int opae_sim::prepare_buffer(uint64_t len, void **buf_addr, uint64_t *wsid, int
void opae_sim::release_buffer(uint64_t wsid) {
auto it = host_buffers_.find(wsid);
if (it != host_buffers_.end()) {
free(it->second.data);
__aligned_free(it->second.data);
host_buffers_.erase(it);
}
}