mirror of
https://github.com/google/cpu_features.git
synced 2025-07-01 13:21:13 +02:00
Fix SSE detection on non-AVX CPUs (#135)
Fixes #4. This is based on #115 with a few modifications: - Removed use of __builtin_cpu_supports since it relies on cpuid and doesn't improve on the current situation, - Added detection for all of sse, sse2, sse3, ssse3, sse4_1 and sse4_2, - Added tests for Atom, Nehalem, and P3 processors, Thx to @gadoofou87 for providing the original PR. It also removes the need for #92 * Fix SSE detection on non-AVX CPUs * Fixes typo * Mock OSX sysctlbyname in tests * Also update other tests * FakeCpu is reset between each tests * Fix conflicting name on Windows * Disable pre AVX cpu sse detection tests on Windows * Guard OS specific code with macros * Fix missing import for tests * Fix wrong function prototype * Fix wrong mocking of P3 on Windows * Completely guard OS specific parts in x86 tests * Store DWORD instead unsigned long for x86 tests
This commit is contained in:
Guillaume Chatelet
committed by
GitHub
GitHub
parent
22a5362e11
commit
4795373db2
@ -55,6 +55,12 @@ add_test(NAME unix_features_aggregator_test COMMAND unix_features_aggregator_tes
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if(PROCESSOR_IS_X86)
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add_executable(cpuinfo_x86_test cpuinfo_x86_test.cc ../src/cpuinfo_x86.c)
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target_compile_definitions(cpuinfo_x86_test PUBLIC CPU_FEATURES_MOCK_CPUID_X86)
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if(HAVE_UTSNAME_H)
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target_compile_definitions(cpuinfo_x86_test PRIVATE HAVE_UTSNAME_H)
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endif()
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if(APPLE)
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target_compile_definitions(cpuinfo_x86_test PRIVATE HAVE_SYSCTLBYNAME)
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endif()
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target_link_libraries(cpuinfo_x86_test all_libraries)
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add_test(NAME cpuinfo_x86_test COMMAND cpuinfo_x86_test)
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endif()
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@ -17,7 +17,12 @@
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#include <cassert>
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#include <cstdio>
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#include <map>
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#include <set>
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#if defined(CPU_FEATURES_OS_WINDOWS)
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#include <windows.h> // IsProcessorFeaturePresent
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#endif // CPU_FEATURES_OS_WINDOWS
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#include "filesystem_for_testing.h"
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#include "gtest/gtest.h"
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#include "internal/cpuid_x86.h"
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@ -25,7 +30,7 @@ namespace cpu_features {
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class FakeCpu {
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public:
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Leaf CpuIdEx(uint32_t leaf_id, int ecx) const {
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Leaf GetCpuidLeaf(uint32_t leaf_id, int ecx) const {
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const auto itr = cpuid_leaves_.find(std::make_pair(leaf_id, ecx));
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if (itr != cpuid_leaves_.end()) {
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return itr->second;
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@ -43,22 +48,66 @@ class FakeCpu {
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xcr0_eax_ = os_backups_extended_registers ? -1 : 0;
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}
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#if defined(CPU_FEATURES_OS_DARWIN)
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bool GetDarwinSysCtlByName(std::string name) const {
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return darwin_sysctlbyname_.count(name);
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}
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void SetDarwinSysCtlByName(std::string name) {
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darwin_sysctlbyname_.insert(name);
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}
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#endif // CPU_FEATURES_OS_DARWIN
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#if defined(CPU_FEATURES_OS_WINDOWS)
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bool GetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature) {
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return windows_isprocessorfeaturepresent_.count(ProcessorFeature);
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}
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void SetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature) {
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windows_isprocessorfeaturepresent_.insert(ProcessorFeature);
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}
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#endif // CPU_FEATURES_OS_WINDOWS
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private:
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std::map<std::pair<uint32_t, int>, Leaf> cpuid_leaves_;
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#if defined(CPU_FEATURES_OS_DARWIN)
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std::set<std::string> darwin_sysctlbyname_;
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#endif // CPU_FEATURES_OS_DARWIN
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#if defined(CPU_FEATURES_OS_WINDOWS)
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std::set<DWORD> windows_isprocessorfeaturepresent_;
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#endif // CPU_FEATURES_OS_WINDOWS
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uint32_t xcr0_eax_;
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};
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auto* g_fake_cpu = new FakeCpu();
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FakeCpu* g_fake_cpu = nullptr;
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extern "C" Leaf CpuIdEx(uint32_t leaf_id, int ecx) {
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return g_fake_cpu->CpuIdEx(leaf_id, ecx);
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extern "C" Leaf GetCpuidLeaf(uint32_t leaf_id, int ecx) {
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return g_fake_cpu->GetCpuidLeaf(leaf_id, ecx);
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}
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extern "C" uint32_t GetXCR0Eax(void) { return g_fake_cpu->GetXCR0Eax(); }
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#if defined(CPU_FEATURES_OS_DARWIN)
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extern "C" bool GetDarwinSysCtlByName(const char* name) {
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return g_fake_cpu->GetDarwinSysCtlByName(name);
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}
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#endif // CPU_FEATURES_OS_DARWIN
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#if defined(CPU_FEATURES_OS_WINDOWS)
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extern "C" bool GetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature) {
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return g_fake_cpu->GetWindowsIsProcessorFeaturePresent(ProcessorFeature);
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}
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#endif // CPU_FEATURES_OS_WINDOWS
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namespace {
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TEST(CpuidX86Test, SandyBridge) {
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class CpuidX86Test : public ::testing::Test {
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protected:
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void SetUp() override { g_fake_cpu = new FakeCpu(); }
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void TearDown() override { delete g_fake_cpu; }
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};
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TEST_F(CpuidX86Test, SandyBridge) {
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g_fake_cpu->SetOsBackupsExtendedRegisters(true);
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x0000000D, 0x756E6547, 0x6C65746E, 0x49656E69}},
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@ -104,7 +153,7 @@ TEST(CpuidX86Test, SandyBridge) {
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const int KiB = 1024;
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const int MiB = 1024 * KiB;
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TEST(CpuidX86Test, SandyBridgeTestOsSupport) {
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TEST_F(CpuidX86Test, SandyBridgeTestOsSupport) {
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x0000000D, 0x756E6547, 0x6C65746E, 0x49656E69}},
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{{0x00000001, 0}, Leaf{0x000206A6, 0x00100800, 0x1F9AE3BF, 0xBFEBFBFF}},
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@ -118,7 +167,7 @@ TEST(CpuidX86Test, SandyBridgeTestOsSupport) {
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EXPECT_TRUE(GetX86Info().features.avx);
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}
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TEST(CpuidX86Test, SkyLake) {
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TEST_F(CpuidX86Test, SkyLake) {
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g_fake_cpu->SetOsBackupsExtendedRegisters(true);
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
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@ -133,7 +182,7 @@ TEST(CpuidX86Test, SkyLake) {
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EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::INTEL_SKL);
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}
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TEST(CpuidX86Test, Branding) {
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TEST_F(CpuidX86Test, Branding) {
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
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{{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
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@ -149,7 +198,7 @@ TEST(CpuidX86Test, Branding) {
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EXPECT_STREQ(brand_string, "Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz");
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}
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TEST(CpuidX86Test, KabyLakeCache) {
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TEST_F(CpuidX86Test, KabyLakeCache) {
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
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{{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
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@ -198,7 +247,7 @@ TEST(CpuidX86Test, KabyLakeCache) {
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EXPECT_EQ(info.levels[3].partitioning, 1);
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}
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TEST(CpuidX86Test, HSWCache) {
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TEST_F(CpuidX86Test, HSWCache) {
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x00000016, 0x756E6547, 0x6C65746E, 0x49656E69}},
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{{0x00000001, 0}, Leaf{0x000406E3, 0x00100800, 0x7FFAFBBF, 0xBFEBFBFF}},
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@ -246,8 +295,9 @@ TEST(CpuidX86Test, HSWCache) {
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EXPECT_EQ(info.levels[3].tlb_entries, 8192);
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EXPECT_EQ(info.levels[3].partitioning, 1);
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}
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// http://users.atw.hu/instlatx64/AuthenticAMD0630F81_K15_Godavari_CPUID.txt
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TEST(CpuidX86Test, AMD_K15) {
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TEST_F(CpuidX86Test, AMD_K15) {
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x0000000D, 0x68747541, 0x444D4163, 0x69746E65}},
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{{0x00000001, 0}, Leaf{0x00630F81, 0x00040800, 0x3E98320B, 0x178BFBFF}},
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@ -273,6 +323,208 @@ TEST(CpuidX86Test, AMD_K15) {
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EXPECT_STREQ(brand_string, "AMD A8-7670K Radeon R7, 10 Compute Cores 4C+6G ");
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}
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// https://github.com/InstLatx64/InstLatx64/blob/master/GenuineIntel/GenuineIntel00106A1_Nehalem_CPUID.txt
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TEST_F(CpuidX86Test, Nehalem) {
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// Pre AVX cpus don't have xsave
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g_fake_cpu->SetOsBackupsExtendedRegisters(false);
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#if defined(CPU_FEATURES_OS_WINDOWS)
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g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
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PF_XMMI_INSTRUCTIONS_AVAILABLE);
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g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
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PF_XMMI64_INSTRUCTIONS_AVAILABLE);
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g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
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PF_SSE3_INSTRUCTIONS_AVAILABLE);
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#endif // CPU_FEATURES_OS_WINDOWS
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#if defined(CPU_FEATURES_OS_DARWIN)
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse2");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse3");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.supplementalsse3");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_1");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_2");
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#endif // CPU_FEATURES_OS_DARWIN
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#if defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
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auto& fs = GetEmptyFilesystem();
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fs.CreateFile("/proc/cpuinfo", R"(processor :
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flags : fpu mmx sse sse2 sse3 ssse3 sse4_1 sse4_2
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)");
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#endif // CPU_FEATURES_OS_LINUX_OR_ANDROID
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x0000000B, 0x756E6547, 0x6C65746E, 0x49656E69}},
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{{0x00000001, 0}, Leaf{0x000106A2, 0x00100800, 0x00BCE3BD, 0xBFEBFBFF}},
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{{0x00000002, 0}, Leaf{0x55035A01, 0x00F0B0E3, 0x00000000, 0x09CA212C}},
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{{0x00000003, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x00000004, 0}, Leaf{0x1C004121, 0x01C0003F, 0x0000003F, 0x00000000}},
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{{0x00000004, 0}, Leaf{0x1C004122, 0x00C0003F, 0x0000007F, 0x00000000}},
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{{0x00000004, 0}, Leaf{0x1C004143, 0x01C0003F, 0x000001FF, 0x00000000}},
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{{0x00000004, 0}, Leaf{0x1C03C163, 0x03C0003F, 0x00000FFF, 0x00000002}},
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{{0x00000005, 0}, Leaf{0x00000040, 0x00000040, 0x00000003, 0x00021120}},
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{{0x00000006, 0}, Leaf{0x00000001, 0x00000002, 0x00000001, 0x00000000}},
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{{0x00000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x00000008, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x00000009, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x0000000A, 0}, Leaf{0x07300403, 0x00000000, 0x00000000, 0x00000603}},
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{{0x0000000B, 0}, Leaf{0x00000001, 0x00000001, 0x00000100, 0x00000000}},
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{{0x0000000B, 0}, Leaf{0x00000004, 0x00000002, 0x00000201, 0x00000000}},
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{{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
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{{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000001, 0x28100000}},
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{{0x80000002, 0}, Leaf{0x756E6547, 0x20656E69, 0x65746E49, 0x2952286C}},
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{{0x80000003, 0}, Leaf{0x55504320, 0x20202020, 0x20202020, 0x40202020}},
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{{0x80000004, 0}, Leaf{0x30303020, 0x20402030, 0x37382E31, 0x007A4847}},
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{{0x80000005, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x80000006, 0}, Leaf{0x00000000, 0x00000000, 0x01006040, 0x00000000}},
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{{0x80000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000100}},
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{{0x80000008, 0}, Leaf{0x00003028, 0x00000000, 0x00000000, 0x00000000}},
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});
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const auto info = GetX86Info();
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EXPECT_STREQ(info.vendor, "GenuineIntel");
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EXPECT_EQ(info.family, 0x06);
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EXPECT_EQ(info.model, 0x1A);
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EXPECT_EQ(info.stepping, 0x02);
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EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::INTEL_NHM);
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char brand_string[49];
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FillX86BrandString(brand_string);
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EXPECT_STREQ(brand_string, "Genuine Intel(R) CPU @ 0000 @ 1.87GHz");
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EXPECT_TRUE(info.features.sse);
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EXPECT_TRUE(info.features.sse2);
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EXPECT_TRUE(info.features.sse3);
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#ifndef CPU_FEATURES_OS_WINDOWS
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// Currently disabled on Windows as IsProcessorFeaturePresent do not support
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// feature detection > sse3.
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EXPECT_TRUE(info.features.ssse3);
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EXPECT_TRUE(info.features.sse4_1);
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EXPECT_TRUE(info.features.sse4_2);
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#endif // CPU_FEATURES_OS_WINDOWS
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}
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// https://github.com/InstLatx64/InstLatx64/blob/master/GenuineIntel/GenuineIntel0030673_Silvermont3_CPUID.txt
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TEST_F(CpuidX86Test, Atom) {
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// Pre AVX cpus don't have xsave
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g_fake_cpu->SetOsBackupsExtendedRegisters(false);
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#if defined(CPU_FEATURES_OS_WINDOWS)
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g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
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PF_XMMI_INSTRUCTIONS_AVAILABLE);
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g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
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PF_XMMI64_INSTRUCTIONS_AVAILABLE);
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g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
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PF_SSE3_INSTRUCTIONS_AVAILABLE);
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#endif // CPU_FEATURES_OS_WINDOWS
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#if defined(CPU_FEATURES_OS_DARWIN)
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse2");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse3");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.supplementalsse3");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_1");
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g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse4_2");
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#endif // CPU_FEATURES_OS_DARWIN
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#if defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
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auto& fs = GetEmptyFilesystem();
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fs.CreateFile("/proc/cpuinfo", R"(
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flags : fpu mmx sse sse2 sse3 ssse3 sse4_1 sse4_2
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)");
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#endif // CPU_FEATURES_OS_LINUX_OR_ANDROID
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g_fake_cpu->SetLeaves({
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{{0x00000000, 0}, Leaf{0x0000000B, 0x756E6547, 0x6C65746E, 0x49656E69}},
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{{0x00000001, 0}, Leaf{0x00030673, 0x00100800, 0x41D8E3BF, 0xBFEBFBFF}},
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{{0x00000002, 0}, Leaf{0x61B3A001, 0x0000FFC2, 0x00000000, 0x00000000}},
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{{0x00000003, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x00000004, 0}, Leaf{0x1C000121, 0x0140003F, 0x0000003F, 0x00000001}},
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{{0x00000004, 1}, Leaf{0x1C000122, 0x01C0003F, 0x0000003F, 0x00000001}},
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{{0x00000004, 2}, Leaf{0x1C00C143, 0x03C0003F, 0x000003FF, 0x00000001}},
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{{0x00000005, 0}, Leaf{0x00000040, 0x00000040, 0x00000003, 0x33000020}},
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{{0x00000006, 0}, Leaf{0x00000005, 0x00000002, 0x00000009, 0x00000000}},
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{{0x00000007, 0}, Leaf{0x00000000, 0x00002282, 0x00000000, 0x00000000}},
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{{0x00000008, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x00000009, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x0000000A, 0}, Leaf{0x07280203, 0x00000000, 0x00000000, 0x00004503}},
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{{0x0000000B, 0}, Leaf{0x00000001, 0x00000001, 0x00000100, 0x00000000}},
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{{0x0000000B, 1}, Leaf{0x00000004, 0x00000004, 0x00000201, 0x00000000}},
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{{0x80000000, 0}, Leaf{0x80000008, 0x00000000, 0x00000000, 0x00000000}},
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{{0x80000001, 0}, Leaf{0x00000000, 0x00000000, 0x00000101, 0x28100000}},
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{{0x80000002, 0}, Leaf{0x20202020, 0x6E492020, 0x286C6574, 0x43202952}},
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{{0x80000003, 0}, Leaf{0x72656C65, 0x52286E6F, 0x50432029, 0x4A202055}},
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{{0x80000004, 0}, Leaf{0x30303931, 0x20402020, 0x39392E31, 0x007A4847}},
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{{0x80000005, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000000}},
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{{0x80000006, 0}, Leaf{0x00000000, 0x00000000, 0x04008040, 0x00000000}},
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{{0x80000007, 0}, Leaf{0x00000000, 0x00000000, 0x00000000, 0x00000100}},
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{{0x80000008, 0}, Leaf{0x00003024, 0x00000000, 0x00000000, 0x00000000}},
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});
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const auto info = GetX86Info();
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EXPECT_STREQ(info.vendor, "GenuineIntel");
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EXPECT_EQ(info.family, 0x06);
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EXPECT_EQ(info.model, 0x37);
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EXPECT_EQ(info.stepping, 0x03);
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EXPECT_EQ(GetX86Microarchitecture(&info),
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X86Microarchitecture::INTEL_ATOM_SMT);
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char brand_string[49];
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FillX86BrandString(brand_string);
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EXPECT_STREQ(brand_string, " Intel(R) Celeron(R) CPU J1900 @ 1.99GHz");
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EXPECT_TRUE(info.features.sse);
|
||||
EXPECT_TRUE(info.features.sse2);
|
||||
EXPECT_TRUE(info.features.sse3);
|
||||
#ifndef CPU_FEATURES_OS_WINDOWS
|
||||
// Currently disabled on Windows as IsProcessorFeaturePresent do not support
|
||||
// feature detection > sse3.
|
||||
EXPECT_TRUE(info.features.ssse3);
|
||||
EXPECT_TRUE(info.features.sse4_1);
|
||||
EXPECT_TRUE(info.features.sse4_2);
|
||||
#endif // CPU_FEATURES_OS_WINDOWS
|
||||
}
|
||||
|
||||
// https://github.com/InstLatx64/InstLatx64/blob/master/GenuineIntel/GenuineIntel0000673_P3_KatmaiDP_CPUID.txt
|
||||
TEST_F(CpuidX86Test, P3) {
|
||||
// Pre AVX cpus don't have xsave
|
||||
g_fake_cpu->SetOsBackupsExtendedRegisters(false);
|
||||
#if defined(CPU_FEATURES_OS_WINDOWS)
|
||||
g_fake_cpu->SetWindowsIsProcessorFeaturePresent(
|
||||
PF_XMMI_INSTRUCTIONS_AVAILABLE);
|
||||
#endif // CPU_FEATURES_OS_WINDOWS
|
||||
#if defined(CPU_FEATURES_OS_DARWIN)
|
||||
g_fake_cpu->SetDarwinSysCtlByName("hw.optional.sse");
|
||||
#endif // CPU_FEATURES_OS_DARWIN
|
||||
#if defined(CPU_FEATURES_OS_LINUX_OR_ANDROID)
|
||||
auto& fs = GetEmptyFilesystem();
|
||||
fs.CreateFile("/proc/cpuinfo", R"(
|
||||
flags : fpu mmx sse
|
||||
)");
|
||||
#endif // CPU_FEATURES_OS_LINUX_OR_ANDROID
|
||||
g_fake_cpu->SetLeaves({
|
||||
{{0x00000000, 0}, Leaf{0x00000003, 0x756E6547, 0x6C65746E, 0x49656E69}},
|
||||
{{0x00000001, 0}, Leaf{0x00000673, 0x00000000, 0x00000000, 0x0387FBFF}},
|
||||
{{0x00000002, 0}, Leaf{0x03020101, 0x00000000, 0x00000000, 0x0C040843}},
|
||||
{{0x00000003, 0}, Leaf{0x00000000, 0x00000000, 0x4CECC782, 0x00006778}},
|
||||
});
|
||||
const auto info = GetX86Info();
|
||||
|
||||
EXPECT_STREQ(info.vendor, "GenuineIntel");
|
||||
EXPECT_EQ(info.family, 0x06);
|
||||
EXPECT_EQ(info.model, 0x07);
|
||||
EXPECT_EQ(info.stepping, 0x03);
|
||||
EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::X86_UNKNOWN);
|
||||
|
||||
char brand_string[49];
|
||||
FillX86BrandString(brand_string);
|
||||
EXPECT_STREQ(brand_string, "");
|
||||
|
||||
EXPECT_TRUE(info.features.mmx);
|
||||
EXPECT_TRUE(info.features.sse);
|
||||
EXPECT_FALSE(info.features.sse2);
|
||||
EXPECT_FALSE(info.features.sse3);
|
||||
#ifndef CPU_FEATURES_OS_WINDOWS
|
||||
// Currently disabled on Windows as IsProcessorFeaturePresent do not support
|
||||
// feature detection > sse3.
|
||||
EXPECT_FALSE(info.features.ssse3);
|
||||
EXPECT_FALSE(info.features.sse4_1);
|
||||
EXPECT_FALSE(info.features.sse4_2);
|
||||
#endif // CPU_FEATURES_OS_WINDOWS
|
||||
}
|
||||
|
||||
// TODO(user): test what happens when xsave/osxsave are not present.
|
||||
// TODO(user): test what happens when xmm/ymm/zmm os support are not
|
||||
// present.
|
||||
|
||||
Reference in New Issue
Block a user