[AMDGPU] add support for hostcall buffer pointer as hidden kernel argument

[sameerds]

Summary

Hostcall is a service that allows a kernel to submit requests to the
host using shared buffers, and block until a response is
received. This will eventually replace the shared buffer currently
used for printf, and repurposes the same hidden kernel argument. This
change introduces a new ValueKind in the HSA metadata to represent the
hostcall buffer.

[arsenm]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

862–863

Is this metadata really necessary if the runtime can just check if the symbol is used?

[sameerds]

• add error for printf in hostcall tests

[sameerds]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

862–863

The metadata itself is necessary because the runtime is not aware of the sequence of hidden arguments. It depends on the metadata to identify each of them.
I tried moving the check for the function name "__ockl_hostcall_internal" to the runtime. This would have nicely avoided having to hard-code a library function name into the backend. But such a check needs us to modify the internalize pass so that this name remains visible to the runtime. For that pass to recognize this function, we have to either hardcode it there (which defeats the purpose) or introduce a new variable similar to llvm.used, which is a non-trivial separate task. So the conclusion was to keep the current check exactly as we see it here.

[arsenm]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

424

I would reorder these to try hostcall first, but it's not important

426

This should probably be using the LLVMContext error, instead of the MCContext error to at least report the function context in the error, e.g:

DiagnosticInfoUnsupported NoGraphicsHSA(
    Fn, "unsupported non-compute shaders with HSA", DL.getDebugLoc());
DAG.getContext()->diagnose(NoGraphicsHSA);

There should also be a testcase hitting this error

[sameerds]

Moved the printf/hostcall check to the printf runtime binding pass

[sameerds]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

426

Moved this whole check to the printf runtime binding pass. This is more appropriate since the check is happening where the printf feature is actually processed.

There already was a test for the error check, replaced it with a newer test.

[sameerds]

Cleaned up the changes to minimize the diff

[arsenm]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

426

Asserting here instead of the error is worse from a MIR testing perspective

llvm/lib/Target/AMDGPU/AMDGPUPrintfRuntimeBinding.cpp

587

Should use CallBase in case an invoke is is ever used

588

I think this goes over 80?

[sameerds]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

426

Why is MIR testing relevant here? printf and hostcall are high-level language features that we are grudgingly handling in the backend for now. Using them both in the same low-level module is undefined, and there is no reason to even write an MIR based test for them.

Also, if asserting is bad, are you asking to keep the error or only remove the assert?

[sameerds]

llvm/lib/Target/AMDGPU/AMDGPUPrintfRuntimeBinding.cpp

587

I don't really see how we could possibly see an invoke for __ockl_hostcall_internal(). If possible, we would probably mark it as nothrow or something in the library sources. I don't have much of a preference either way, but it seems cleaner to keep the CallInst precisely to document the fact that we don't expect to see an invoke here, and also to match the nearby check for calls to printf itself.

[sameerds]

fixed the line length under 80

[arsenm]

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

426

Because the property enforced by this pass might not be enforced in a MIR run. Asserting on a not-bug edge case MIR sometimes wastes time debugging

llvm/test/CodeGen/AMDGPU/opencl-printf-no-hostcall.ll

16

Drop the argument names here which I'm surprised even parse?

[sameerds]

llvm/test/CodeGen/AMDGPU/opencl-printf-no-hostcall.ll

16

Fixed this in the commit.

llvm/docs/AMDGPUUsage.rst

"ValueKind"       string         Required  Kernel argument kind that
                                                   be left for it, but it does
                                                   not need to be set up.
 
                                                 "HiddenPrintfBuffer"
                                                   A global address space pointer
                                                   to the runtime printf buffer
                                                   is passed in kernarg.
 
+                                                "HiddenHostcallBuffer"
+                                                  A global address space pointer
+                                                  to the runtime hostcall buffer
+                                                  is passed in kernarg.
+
                                                 "HiddenDefaultQueue"
                                                   A global address space pointer
                                                   to the OpenCL device enqueue
                                                   queue that should be used by
                                                   the kernel by default is
                                                   passed in the kernarg.
 
                                                 "HiddenCompletionAction"
".value_kind"          string         Required  Kernel argument kind that
                                                        be left for it, but it does
                                                        not need to be set up.
 
                                                      "hidden_printf_buffer"
                                                        A global address space pointer
                                                        to the runtime printf buffer
                                                        is passed in kernarg.
 
+                                                     "hidden_hostcall_buffer"
+                                                       A global address space pointer
+                                                       to the runtime hostcall buffer
+                                                       is passed in kernarg.
+
                                                      "hidden_default_queue"
                                                        A global address space pointer
                                                        to the OpenCL device enqueue
                                                        queue that should be used by
                                                        the kernel by default is
                                                        passed in the kernarg.
 
                                                      "hidden_completion_action"

llvm/include/llvm/Support/AMDGPUMetadata.h

enum class ValueKind : uint8_t {
   HiddenGlobalOffsetX    = 7,
   HiddenGlobalOffsetY    = 8,
   HiddenGlobalOffsetZ    = 9,
   HiddenNone             = 10,
   HiddenPrintfBuffer     = 11,
   HiddenDefaultQueue     = 12,
   HiddenCompletionAction = 13,
   HiddenMultiGridSyncArg = 14,
+  HiddenHostcallBuffer   = 15,
   Unknown                = 0xff
 };
 
 /// Value types.
 enum class ValueType : uint8_t {
   Struct  = 0,
   I8      = 1,
   U8      = 2,

llvm/lib/BinaryFormat/AMDGPUMetadataVerifier.cpp

if (!verifyScalarEntry(ArgsMap, ".value_kind", true,
                                .Case("image", true)
                                .Case("pipe", true)
                                .Case("queue", true)
                                .Case("hidden_global_offset_x", true)
                                .Case("hidden_global_offset_y", true)
                                .Case("hidden_global_offset_z", true)
                                .Case("hidden_none", true)
                                .Case("hidden_printf_buffer", true)
+                               .Case("hidden_hostcall_buffer", true)
                                .Case("hidden_default_queue", true)
                                .Case("hidden_completion_action", true)
                                .Case("hidden_multigrid_sync_arg", true)
                                .Default(false);
                          }))
     return false;
   if (!verifyScalarEntry(ArgsMap, ".value_type", true,
                          msgpack::Type::String,

llvm/lib/Support/AMDGPUMetadata.cpp

static void enumeration(IO &YIO, ValueKind &EN) {
     YIO.enumCase(EN, "Image", ValueKind::Image);
     YIO.enumCase(EN, "Pipe", ValueKind::Pipe);
     YIO.enumCase(EN, "Queue", ValueKind::Queue);
     YIO.enumCase(EN, "HiddenGlobalOffsetX", ValueKind::HiddenGlobalOffsetX);
     YIO.enumCase(EN, "HiddenGlobalOffsetY", ValueKind::HiddenGlobalOffsetY);
     YIO.enumCase(EN, "HiddenGlobalOffsetZ", ValueKind::HiddenGlobalOffsetZ);
     YIO.enumCase(EN, "HiddenNone", ValueKind::HiddenNone);
     YIO.enumCase(EN, "HiddenPrintfBuffer", ValueKind::HiddenPrintfBuffer);
+    YIO.enumCase(EN, "HiddenHostcallBuffer", ValueKind::HiddenHostcallBuffer);
     YIO.enumCase(EN, "HiddenDefaultQueue", ValueKind::HiddenDefaultQueue);
     YIO.enumCase(EN, "HiddenCompletionAction",
                  ValueKind::HiddenCompletionAction);
     YIO.enumCase(EN, "HiddenMultiGridSyncArg",
      ValueKind::HiddenMultiGridSyncArg);
   }
 };
 

llvm/lib/Target/AMDGPU/AMDGPUHSAMetadataStreamer.cpp

void MetadataStreamerV2::emitHiddenKernelArgs(const Function &Func) {
   auto Int8PtrTy = Type::getInt8PtrTy(Func.getContext(),
                                       AMDGPUAS::GLOBAL_ADDRESS);
 
   // Emit "printf buffer" argument if printf is used, otherwise emit dummy
   // "none" argument.
   if (HiddenArgNumBytes >= 32) {
     if (Func.getParent()->getNamedMetadata("llvm.printf.fmts"))
       emitKernelArg(DL, Int8PtrTy, ValueKind::HiddenPrintfBuffer);
-    else
+    else if (Func.getParent()->getFunction("__ockl_hostcall_internal")) {
+      // The printf runtime binding pass should have ensured that hostcall and
+      // printf are not used in the same module.
+      assert(!Func.getParent()->getNamedMetadata("llvm.printf.fmts"));
+      emitKernelArg(DL, Int8PtrTy, ValueKind::HiddenHostcallBuffer);
+    } else
       emitKernelArg(DL, Int8PtrTy, ValueKind::HiddenNone);
   }
 
   // Emit "default queue" and "completion action" arguments if enqueue kernel is
   // used, otherwise emit dummy "none" arguments.
   if (HiddenArgNumBytes >= 48) {
     if (Func.hasFnAttribute("calls-enqueue-kernel")) {
       emitKernelArg(DL, Int8PtrTy, ValueKind::HiddenDefaultQueue);
void MetadataStreamerV3::emitHiddenKernelArgs(const Function &Func,
   auto Int8PtrTy =
       Type::getInt8PtrTy(Func.getContext(), AMDGPUAS::GLOBAL_ADDRESS);
 
   // Emit "printf buffer" argument if printf is used, otherwise emit dummy
   // "none" argument.
   if (HiddenArgNumBytes >= 32) {
     if (Func.getParent()->getNamedMetadata("llvm.printf.fmts"))
       emitKernelArg(DL, Int8PtrTy, "hidden_printf_buffer", Offset, Args);
-    else
+    else if (Func.getParent()->getFunction("__ockl_hostcall_internal")) {
+      // The printf runtime binding pass should have ensured that hostcall and
+      // printf are not used in the same module.
+      assert(!Func.getParent()->getNamedMetadata("llvm.printf.fmts"));
+      emitKernelArg(DL, Int8PtrTy, "hidden_hostcall_buffer", Offset, Args);
+    } else
       emitKernelArg(DL, Int8PtrTy, "hidden_none", Offset, Args);
   }
 
   // Emit "default queue" and "completion action" arguments if enqueue kernel is
   // used, otherwise emit dummy "none" arguments.
   if (HiddenArgNumBytes >= 48) {
     if (Func.hasFnAttribute("calls-enqueue-kernel")) {
       emitKernelArg(DL, Int8PtrTy, "hidden_default_queue", Offset, Args);

llvm/lib/Target/AMDGPU/AMDGPUPrintfRuntimeBinding.cpp

if (auto *CI = dyn_cast<CallInst>(U.getUser())) {
       if (CI->isCallee(&U))
         Printfs.push_back(CI);
     }
   }
 
   if (Printfs.empty())
     return false;
 
+  if (auto HostcallFunction = M.getFunction("__ockl_hostcall_internal")) {
+    for (auto &U : HostcallFunction->uses()) {
+      if (auto *CI = dyn_cast<CallInst>(U.getUser())) {
+        M.getContext().emitError(
+            CI, "Cannot use both printf and hostcall in the same module");
+      }
+    }
+  }
+
   TD = &M.getDataLayout();
   auto DTWP = getAnalysisIfAvailable<DominatorTreeWrapperPass>();
   DT = DTWP ? &DTWP->getDomTree() : nullptr;
   auto GetTLI = [this](Function &F) -> TargetLibraryInfo & {
     return this->getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
   };
 
   return lowerPrintfForGpu(M, GetTLI);
 }

llvm/test/CodeGen/AMDGPU/hsa-metadata-from-llvm-ir-full-v3.ll

 ; CHECK-NEXT:         .size:           8
 ; CHECK-NEXT:         .value_kind:     hidden_global_offset_z
 ; CHECK-NEXT:         .value_type:     i64
 ; CHECK-NEXT:       - .address_space:  global
 ; CHECK-NEXT:         .offset:         32
 ; CHECK-NEXT:         .size:           8
 ; CHECK-NOT:          .value_kind:     hidden_default_queue
 ; CHECK-NOT:          .value_kind:     hidden_completion_action
+; CHECK-NOT:          .value_kind:     hidden_hostcall_buffer
 ; CHECK-NEXT:         .value_kind:     hidden_printf_buffer
 ; CHECK-NEXT:         .value_type:     i8
 ; CHECK:              .value_kind:     hidden_multigrid_sync_arg
 ; CHECK-NEXT:         .value_type:     i8
 ; CHECK:          .language:       OpenCL C
 ; CHECK-NEXT:     .language_version:
 ; CHECK-NEXT:       - 2
 ; CHECK-NEXT:       - 0

llvm/test/CodeGen/AMDGPU/hsa-metadata-from-llvm-ir-full.ll

 ; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetY
 ; CHECK-NEXT:       ValueType:     I64
 ; CHECK-NEXT:     - Size:          8
 ; CHECK-NEXT:       Align:         8
 ; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetZ
 ; CHECK-NEXT:       ValueType:     I64
 ; CHECK-NEXT:     - Size:          8
 ; CHECK-NEXT:       Align:         8
+; CHECK-NOT:        ValueKind:     HiddenHostcallBuffer
 ; CHECK-NEXT:       ValueKind:     HiddenPrintfBuffer
 ; CHECK-NEXT:       ValueType:     I8
 ; CHECK-NEXT:       AddrSpaceQual: Global
 ; CHECK-NOT:        ValueKind:     HiddenDefaultQueue
 ; CHECK-NOT:        ValueKind:     HiddenCompletionAction
 ; CHECK:            ValueKind:     HiddenMultiGridSyncArg
 ; CHECK-NEXT:       ValueType:     I8
 ; CHECK-NEXT:       AddrSpaceQual: Global

llvm/test/CodeGen/AMDGPU/hsa-metadata-hostcall-absent-v3.ll

+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=+code-object-v3 -mcpu=gfx900 -filetype=obj -o - < %s | llvm-readelf --notes | FileCheck %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=+code-object-v3 -mcpu=gfx900 -amdgpu-dump-hsa-metadata -amdgpu-verify-hsa-metadata -filetype=obj -o - < %s 2>&1 | FileCheck --check-prefix=PARSER %s
+
+; CHECK:              ---
+; CHECK:      amdhsa.kernels:
+; CHECK:        - .args:
+; CHECK-NEXT:       - .name:           a
+; CHECK-NEXT:         .offset:         0
+; CHECK-NEXT:         .size:           1
+; CHECK-NEXT:         .type_name:      char
+; CHECK-NEXT:         .value_kind:     by_value
+; CHECK-NEXT:         .value_type:     i8
+; CHECK-NEXT:       - .offset:         8
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_global_offset_x
+; CHECK-NEXT:         .value_type:     i64
+; CHECK-NEXT:       - .offset:         16
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_global_offset_y
+; CHECK-NEXT:         .value_type:     i64
+; CHECK-NEXT:       - .offset:         24
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_global_offset_z
+; CHECK-NEXT:         .value_type:     i64
+
+; CHECK-NOT:          .value_kind:     hidden_hostcall_buffer
+
+; CHECK:          .language:       OpenCL C
+; CHECK-NEXT:     .language_version:
+; CHECK-NEXT:       - 2
+; CHECK-NEXT:       - 0
+; CHECK:          .name:           test_kernel
+; CHECK:          .symbol:         test_kernel.kd
+
+define amdgpu_kernel void @test_kernel(i8 %a) #0
+    !kernel_arg_addr_space !1 !kernel_arg_access_qual !2 !kernel_arg_type !3
+    !kernel_arg_base_type !3 !kernel_arg_type_qual !4 {
+  ret void
+}
+
+; CHECK:  amdhsa.version:
+; CHECK-NEXT: - 1
+; CHECK-NEXT: - 0
+
+attributes #0 = { "amdgpu-implicitarg-num-bytes"="48" }
+
+!1 = !{i32 0}
+!2 = !{!"none"}
+!3 = !{!"char"}
+!4 = !{!""}
+
+!opencl.ocl.version = !{!90}
+!90 = !{i32 2, i32 0}
+
+; PARSER: AMDGPU HSA Metadata Parser Test: PASS

llvm/test/CodeGen/AMDGPU/hsa-metadata-hostcall-absent.ll

+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=-code-object-v3 -mcpu=gfx900 -filetype=obj -o - < %s | llvm-readelf --notes | FileCheck %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=-code-object-v3 -mcpu=gfx900 -amdgpu-dump-hsa-metadata -amdgpu-verify-hsa-metadata -filetype=obj -o - < %s 2>&1 | FileCheck --check-prefix=PARSER %s
+
+; CHECK: ---
+; CHECK:  Version: [ 1, 0 ]
+; CHECK:  Kernels:
+
+; CHECK:      - Name:            test_kernel
+; CHECK-NEXT:   SymbolName:      'test_kernel@kd'
+; CHECK-NEXT:   Language:        OpenCL C
+; CHECK-NEXT:   LanguageVersion: [ 2, 0 ]
+; CHECK-NEXT:   Args:
+; CHECK-NEXT:     - Name:          a
+; CHECK-NEXT:       TypeName:      char
+; CHECK-NEXT:       Size:          1
+; CHECK-NEXT:       Align:         1
+; CHECK-NEXT:       ValueKind:     ByValue
+; CHECK-NEXT:       ValueType:     I8
+; CHECK-NEXT:       AccQual:       Default
+; CHECK-NEXT:     - Size:          8
+; CHECK-NEXT:       Align:         8
+; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetX
+; CHECK-NEXT:       ValueType:     I64
+; CHECK-NEXT:     - Size:          8
+; CHECK-NEXT:       Align:         8
+; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetY
+; CHECK-NEXT:       ValueType:     I64
+; CHECK-NEXT:     - Size:          8
+; CHECK-NEXT:       Align:         8
+; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetZ
+; CHECK-NEXT:       ValueType:     I64
+; CHECK-NOT:        ValueKind:     HiddenHostcallBuffer
+; CHECK-NOT:        ValueKind:     HiddenDefaultQueue
+; CHECK-NOT:        ValueKind:     HiddenCompletionAction
+
+define amdgpu_kernel void @test_kernel(i8 %a) #0
+    !kernel_arg_addr_space !1 !kernel_arg_access_qual !2 !kernel_arg_type !3
+    !kernel_arg_base_type !3 !kernel_arg_type_qual !4 {
+  ret void
+}
+
+attributes #0 = { "amdgpu-implicitarg-num-bytes"="48" }
+
+!1 = !{i32 0}
+!2 = !{!"none"}
+!3 = !{!"char"}
+!4 = !{!""}
+
+!opencl.ocl.version = !{!90}
+!90 = !{i32 2, i32 0}
+
+; PARSER: AMDGPU HSA Metadata Parser Test: PASS

llvm/test/CodeGen/AMDGPU/hsa-metadata-hostcall-present-v3.ll

+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=+code-object-v3 -mcpu=gfx900 -filetype=obj -o - < %s | llvm-readelf --notes | FileCheck %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=+code-object-v3 -mcpu=gfx900 -amdgpu-dump-hsa-metadata -amdgpu-verify-hsa-metadata -filetype=obj -o - < %s 2>&1 | FileCheck --check-prefix=PARSER %s
+
+; CHECK:              ---
+; CHECK:      amdhsa.kernels:
+; CHECK:        - .args:
+; CHECK-NEXT:       - .name:           a
+; CHECK-NEXT:         .offset:         0
+; CHECK-NEXT:         .size:           1
+; CHECK-NEXT:         .type_name:      char
+; CHECK-NEXT:         .value_kind:     by_value
+; CHECK-NEXT:         .value_type:     i8
+; CHECK-NEXT:       - .offset:         8
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_global_offset_x
+; CHECK-NEXT:         .value_type:     i64
+; CHECK-NEXT:       - .offset:         16
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_global_offset_y
+; CHECK-NEXT:         .value_type:     i64
+; CHECK-NEXT:       - .offset:         24
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_global_offset_z
+; CHECK-NEXT:         .value_type:     i64
+; CHECK-NEXT:       - .address_space:  global
+; CHECK-NEXT:         .offset:         32
+; CHECK-NEXT:         .size:           8
+; CHECK-NEXT:         .value_kind:     hidden_hostcall_buffer
+; CHECK-NEXT:         .value_type:     i8
+; CHECK:          .language:       OpenCL C
+; CHECK-NEXT:     .language_version:
+; CHECK-NEXT:       - 2
+; CHECK-NEXT:       - 0
+; CHECK:          .name:           test_kernel
+; CHECK:          .symbol:         test_kernel.kd
+
+declare <2 x i64> @__ockl_hostcall_internal(i8* %0, i32 %1, i64 %2, i64 %3, i64 %4, i64 %5, i64 %6, i64 %7, i64 %8, i64 %9)
+
+define amdgpu_kernel void @test_kernel(i8 %a) #0
+    !kernel_arg_addr_space !1 !kernel_arg_access_qual !2 !kernel_arg_type !3
+    !kernel_arg_base_type !3 !kernel_arg_type_qual !4 {
+  ret void
+}
+
+; CHECK:  amdhsa.version:
+; CHECK-NEXT: - 1
+; CHECK-NEXT: - 0
+
+attributes #0 = { "amdgpu-implicitarg-num-bytes"="48" }
+
+!1 = !{i32 0}
+!2 = !{!"none"}
+!3 = !{!"char"}
+!4 = !{!""}
+
+!opencl.ocl.version = !{!90}
+!90 = !{i32 2, i32 0}
+
+; PARSER: AMDGPU HSA Metadata Parser Test: PASS

llvm/test/CodeGen/AMDGPU/hsa-metadata-hostcall-present.ll

+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=-code-object-v3 -mcpu=gfx900 -filetype=obj -o - < %s | llvm-readelf --notes | FileCheck %s
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mattr=-code-object-v3 -mcpu=gfx900 -amdgpu-dump-hsa-metadata -amdgpu-verify-hsa-metadata -filetype=obj -o - < %s 2>&1 | FileCheck --check-prefix=PARSER %s
+
+; CHECK: ---
+; CHECK:  Version: [ 1, 0 ]
+; CHECK:  Kernels:
+
+; CHECK:      - Name:            test_kernel
+; CHECK-NEXT:   SymbolName:      'test_kernel@kd'
+; CHECK-NEXT:   Language:        OpenCL C
+; CHECK-NEXT:   LanguageVersion: [ 2, 0 ]
+; CHECK-NEXT:   Args:
+; CHECK-NEXT:     - Name:          a
+; CHECK-NEXT:       TypeName:      char
+; CHECK-NEXT:       Size:          1
+; CHECK-NEXT:       Align:         1
+; CHECK-NEXT:       ValueKind:     ByValue
+; CHECK-NEXT:       ValueType:     I8
+; CHECK-NEXT:       AccQual:       Default
+; CHECK-NEXT:     - Size:          8
+; CHECK-NEXT:       Align:         8
+; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetX
+; CHECK-NEXT:       ValueType:     I64
+; CHECK-NEXT:     - Size:          8
+; CHECK-NEXT:       Align:         8
+; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetY
+; CHECK-NEXT:       ValueType:     I64
+; CHECK-NEXT:     - Size:          8
+; CHECK-NEXT:       Align:         8
+; CHECK-NEXT:       ValueKind:     HiddenGlobalOffsetZ
+; CHECK-NEXT:       ValueType:     I64
+; CHECK-NEXT:     - Size:            8
+; CHECK-NEXT:       Align:           8
+; CHECK-NEXT:       ValueKind:       HiddenHostcallBuffer
+; CHECK-NEXT:       ValueType:       I8
+; CHECK-NEXT:       AddrSpaceQual:   Global
+; CHECK-NOT:        ValueKind:     HiddenDefaultQueue
+; CHECK-NOT:        ValueKind:     HiddenCompletionAction
+
+declare <2 x i64> @__ockl_hostcall_internal(i8* %0, i32 %1, i64 %2, i64 %3, i64 %4, i64 %5, i64 %6, i64 %7, i64 %8, i64 %9)
+
+define amdgpu_kernel void @test_kernel(i8 %a) #0
+    !kernel_arg_addr_space !1 !kernel_arg_access_qual !2 !kernel_arg_type !3
+    !kernel_arg_base_type !3 !kernel_arg_type_qual !4 {
+  ret void
+}
+
+attributes #0 = { "amdgpu-implicitarg-num-bytes"="48" }
+
+!1 = !{i32 0}
+!2 = !{!"none"}
+!3 = !{!"char"}
+!4 = !{!""}
+
+!opencl.ocl.version = !{!90}
+!90 = !{i32 2, i32 0}
+
+; PARSER: AMDGPU HSA Metadata Parser Test: PASS

llvm/test/CodeGen/AMDGPU/opencl-printf-no-hostcall.ll

+; RUN: not opt -S -mtriple=amdgcn-unknown-unknown -amdgpu-printf-runtime-binding < %s 2>&1 | FileCheck %s
+
+@.str = private unnamed_addr addrspace(2) constant [6 x i8] c"%s:%d\00", align 1
+
+define amdgpu_kernel void @test_kernel(i32 %n) {
+entry:
+  %str = alloca [9 x i8], align 1
+  %arraydecay = getelementptr inbounds [9 x i8], [9 x i8]* %str, i32 0, i32 0
+  %call1 = call i32 (i8 addrspace(2)*, ...) @printf(i8 addrspace(2)* getelementptr inbounds ([6 x i8], [6 x i8] addrspace(2)* @.str, i32 0, i32 0), i8* %arraydecay, i32 %n)
+  %call2 = call <2 x i64> (i8*, i32, i64, i64, i64, i64, i64, i64, i64, i64) @__ockl_hostcall_internal(i8* undef, i32 1, i64 2, i64 3, i64 4, i64 5, i64 6, i64 7, i64 8, i64 9)
+  ret void
+}
+
+declare i32 @printf(i8 addrspace(2)*, ...)
+
+declare <2 x i64> @__ockl_hostcall_internal(i8* %0, i32 %1, i64 %2, i64 %3, i64 %4, i64 %5, i64 %6, i64 %7, i64 %8, i64 %9)
+
+; CHECK: error: Cannot use both printf and hostcall in the same module