UUIDs generation

Related-To: NEO-4964

Change-Id: I0ef5912fb744788f713803f539551c7b0b134208
Signed-off-by: Mateusz Hoppe <[email protected]>

Author: HoppeMateusz

opencl/test/unit_test/os_interface/linux/drm_mock.h

@@ -31,6 +31,7 @@ class DrmMock : public Drm {
   public:
     using Drm::checkQueueSliceSupport;
     using Drm::engineInfo;
+    using Drm::generateUUID;
     using Drm::getQueueSliceCount;
     using Drm::memoryInfo;
     using Drm::nonPersistentContextsSupported;

opencl/test/unit_test/os_interface/linux/drm_tests.cpp

@@ -349,6 +349,22 @@ TEST(DrmTest, givenPlatformWithSupportToChangeSliceCountWhenCallSetQueueSliceCou
     EXPECT_EQ(0, drm->getQueueSliceCount(&sseu));
     EXPECT_EQ(drm->getSliceMask(newSliceCount), sseu.slice_mask);
 }
+
+TEST(DrmTest, GivenDrmWhenGeneratingUUIDThenCorrectStringsAreReturned) {
+    DrmMock drm{};
+    auto uuid1 = drm.generateUUID();
+    auto uuid2 = drm.generateUUID();
+
+    std::string uuidff;
+    for (int i = 0; i < 0xff - 2; i++) {
+        uuidff = drm.generateUUID();
+    }
+
+    EXPECT_STREQ("00000000-0000-0000-0000-000000000001", uuid1.c_str());
+    EXPECT_STREQ("00000000-0000-0000-0000-000000000002", uuid2.c_str());
+    EXPECT_STREQ("00000000-0000-0000-0000-0000000000ff", uuidff.c_str());
+}
+
 namespace NEO {
 namespace SysCalls {
 extern uint32_t closeFuncCalled;

shared/source/os_interface/linux/drm_neo.cpp

@@ -473,6 +473,21 @@ uint32_t Drm::getVirtualMemoryAddressSpace(uint32_t vmId) {
     return 0;
 }
 
+std::string Drm::generateUUID() {
+    const char uuidString[] = "00000000-0000-0000-%04" SCNx64 "-%012" SCNx64;
+    char buffer[36 + 1] = "00000000-0000-0000-0000-000000000000";
+    uuid++;
+
+    UNRECOVERABLE_IF(uuid == 0xFFFFFFFFFFFFFFFF);
+
+    uint64_t parts[2] = {0, 0};
+    parts[0] = uuid & 0xFFFFFFFFFFFF;
+    parts[1] = (uuid & 0xFFFF000000000000) >> 48;
+    sprintf(buffer, uuidString, parts[1], parts[0]);
+
+    return std::string(buffer, 36);
+}
+
 Drm::~Drm() {
     destroyVirtualMemoryAddressSpace();
 }

shared/source/os_interface/linux/drm_neo.h

@@ -123,6 +123,7 @@ class Drm {
 
   protected:
     int getQueueSliceCount(drm_i915_gem_context_param_sseu *sseu);
+    std::string generateUUID();
     bool sliceCountChangeSupported = false;
     drm_i915_gem_context_param_sseu sseu{};
     bool preemptionSupported = false;
@@ -133,6 +134,7 @@ class Drm {
     int revisionId = 0;
     GTTYPE eGtType = GTTYPE_UNDEFINED;
     RootDeviceEnvironment &rootDeviceEnvironment;
+    uint64_t uuid = 0;
 
     Drm(std::unique_ptr<HwDeviceId> hwDeviceIdIn, RootDeviceEnvironment &rootDeviceEnvironment);
     std::unique_ptr<EngineInfo> engineInfo;