Implement PMC AcquireTrace

Existing code uses lockf to ensure exclusive PMC access of one process and
one TraceId. However Thunk spec allows hsaKmtPmcAcquireTraceAccess to get
exclusive access to the defined set of counters, not exclusive to one
process or one TraceId. Multiple counter sets of multiple TraceIds is
allowed if they meet the concurrent access limit evaluated by the hardware
/driver.

Change-Id: I59cacb855a707fe326a4070452fcbbd3c95ac223


[ROCm/ROCR-Runtime commit: 1025579c0b]

projects/rocr-runtime/src/pmc_table.c

@@ -192,6 +192,16 @@ static struct perf_counter_block polaris_blocks[PERFCOUNTER_BLOCKID__MAX] = {
  */
 static struct perf_counter_block iommu_block;
 
+uint32_t pmc_table_get_max_concurrent(int block_id)
+{
+	switch (block_id) {
+	case PERFCOUNTER_BLOCKID__IOMMUV2:
+		return iommu_block.num_of_slots;
+	default:
+		return 0;
+	}
+}
+
 static HSAKMT_STATUS
 alloc_pmc_blocks_iommu(void)
 {