[SYCL] List unsupported platforms in sycl-ls verbose mode (#15166)

The runtime is able to recognised [banned
platforms](https://intel.github.io/llvm-docs/doxygen/namespacesycl_1_1__V1_1_1detail.html#af47bb6df075ff6aa60fc6855d59f6fe6),
this patch provides a way to list them using `sycl-ls`' `verbose`
switch.

sycl/include/sycl/platform.hpp

@@ -194,6 +194,11 @@ class __SYCL_EXPORT platform : public detail::OwnerLessBase<platform> {
   /// \return a vector of all available SYCL platforms.
   static std::vector<platform> get_platforms();
 
+  /// Returns all unsupported (non-SYCL) platforms in the system.
+  ///
+  /// \return a vector of all unsupported non-SYCL platforms.
+  static std::vector<platform> get_unsupported_platforms();
+
   /// Returns the backend associated with this platform.
   ///
   /// \return the backend associated with this platform

sycl/source/detail/platform_impl.cpp

@@ -96,40 +96,69 @@ static bool IsBannedPlatform(platform Platform) {
          IsMatchingOpenCL(Platform, "AMD Accelerated Parallel Processing");
 }
 
-// This routine has the side effect of registering each platform's last device
-// id into each plugin, which is used for device counting.
-std::vector<platform> platform_impl::get_platforms() {
+// Get the vector of platforms supported by a given UR plugin
+// replace uses of this with a helper in plugin object, the plugin
+// objects will own the ur adapter handles and they'll need to pass them to
+// urPlatformsGet - so urPlatformsGet will need to be wrapped with a helper
+std::vector<platform> platform_impl::getPluginPlatforms(PluginPtr &Plugin,
+                                                        bool Supported) {
+  std::vector<platform> Platforms;
 
-  // Get the vector of platforms supported by a given UR plugin
-  // replace uses of this with with a helper in plugin object, the plugin
-  // objects will own the ur adapter handles and they'll need to pass them to
-  // urPlatformsGet - so urPlatformsGet will need to be wrapped with a helper
-  auto getPluginPlatforms = [](PluginPtr &Plugin) {
-    std::vector<platform> Platforms;
+  auto UrPlatforms = Plugin->getUrPlatforms();
 
-    auto UrPlatforms = Plugin->getUrPlatforms();
+  if (UrPlatforms.empty()) {
+    return Platforms;
+  }
 
-    if (UrPlatforms.empty()) {
-      return Platforms;
-    }
+  for (const auto &UrPlatform : UrPlatforms) {
+    platform Platform = detail::createSyclObjFromImpl<platform>(
+        getOrMakePlatformImpl(UrPlatform, Plugin));
+    const bool IsBanned = IsBannedPlatform(Platform);
+    const bool HasAnyDevices =
+        !Platform.get_devices(info::device_type::all).empty();
 
-    for (const auto &UrPlatform : UrPlatforms) {
-      platform Platform = detail::createSyclObjFromImpl<platform>(
-          getOrMakePlatformImpl(UrPlatform, Plugin));
-      if (IsBannedPlatform(Platform)) {
+    if (!Supported) {
+      if (IsBanned || !HasAnyDevices) {
+        Platforms.push_back(Platform);
+      }
+    } else {
+      if (IsBanned) {
         continue; // bail as early as possible, otherwise banned platforms may
                   // mess up device counting
       }
 
       // The SYCL spec says that a platform has one or more devices. ( SYCL
       // 2020 4.6.2 ) If we have an empty platform, we don't report it back
       // from platform::get_platforms().
-      if (!Platform.get_devices(info::device_type::all).empty()) {
+      if (HasAnyDevices) {
         Platforms.push_back(Platform);
       }
     }
-    return Platforms;
-  };
+  }
+  return Platforms;
+}
+
+std::vector<platform> platform_impl::get_unsupported_platforms() {
+  std::vector<platform> UnsupportedPlatforms;
+
+  std::vector<PluginPtr> &Plugins = sycl::detail::ur::initializeUr();
+  // Ignore UR as it has to be supported.
+  for (auto &Plugin : Plugins) {
+    if (Plugin->hasBackend(backend::all)) {
+      continue; // skip UR
+    }
+    std::vector<platform> PluginPlatforms =
+        getPluginPlatforms(Plugin, /*Supported=*/false);
+    std::copy(PluginPlatforms.begin(), PluginPlatforms.end(),
+              std::back_inserter(UnsupportedPlatforms));
+  }
+
+  return UnsupportedPlatforms;
+}
+
+// This routine has the side effect of registering each platform's last device
+// id into each plugin, which is used for device counting.
+std::vector<platform> platform_impl::get_platforms() {
 
   // See which platform we want to be served by which plugin.
   // There should be just one plugin serving each backend.

sycl/source/detail/platform_impl.hpp

@@ -122,6 +122,11 @@ class platform_impl {
   /// \return a vector of all available SYCL platforms.
   static std::vector<platform> get_platforms();
 
+  /// Returns all unsupported (non-SYCL) platforms in the system.
+  ///
+  /// \return a vector of all unsupported (non-SYCL) platforms.
+  static std::vector<platform> get_unsupported_platforms();
+
   // \return the Plugin associated with this platform.
   const PluginPtr &getPlugin() const { return MPlugin; }
 
@@ -200,6 +205,10 @@ class platform_impl {
 private:
   std::shared_ptr<device_impl> getDeviceImplHelper(ur_device_handle_t UrDevice);
 
+  // Helper to get the vector of platforms supported by a given UR plugin
+  static std::vector<platform> getPluginPlatforms(PluginPtr &Plugin,
+                                                  bool Supported = true);
+
   // Helper to filter reportable devices in the platform
   template <typename ListT, typename FilterT>
   std::vector<int>

sycl/source/platform.cpp

@@ -52,6 +52,10 @@ std::vector<platform> platform::get_platforms() {
   return detail::platform_impl::get_platforms();
 }
 
+std::vector<platform> platform::get_unsupported_platforms() {
+  return detail::platform_impl::get_unsupported_platforms();
+}
+
 backend platform::get_backend() const noexcept { return impl->getBackend(); }
 
 template <typename Param>

sycl/test-e2e/Plugin/sycl-ls-banned.cpp

@@ -0,0 +1,16 @@
+// REQUIRES: cuda
+
+// RUN: sycl-ls --verbose >%t.cuda.out
+// RUN: FileCheck %s --input-file %t.cuda.out
+
+//==---- sycl-ls-banned.cpp - Check sycl-ls output of banned platforms. --==//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// CHECK: Unsupported Platforms:
+// CHECK-NEXT: Platform [#1]:
+// CHECK-NEXT: Version  : OpenCL

sycl/test/abi/sycl_symbols_linux.dump

@@ -3544,6 +3544,7 @@ _ZN4sycl3_V17samplerC1EP11_cl_samplerRKNS0_7contextE
 _ZN4sycl3_V17samplerC2ENS0_29coordinate_normalization_modeENS0_15addressing_modeENS0_14filtering_modeERKNS0_13property_listE
 _ZN4sycl3_V17samplerC2EP11_cl_samplerRKNS0_7contextE
 _ZN4sycl3_V18platform13get_platformsEv
+_ZN4sycl3_V18platform25get_unsupported_platformsEv
 _ZN4sycl3_V18platformC1EP15_cl_platform_id
 _ZN4sycl3_V18platformC1ERKNS0_15device_selectorE
 _ZN4sycl3_V18platformC1ERKNS0_6deviceE

sycl/test/abi/sycl_symbols_windows.dump

@@ -4032,6 +4032,7 @@
 ?get_platform@context@_V1@sycl@@QEBA?AVplatform@23@XZ
 ?get_platform@device@_V1@sycl@@QEBA?AVplatform@23@XZ
 ?get_platforms@platform@_V1@sycl@@SA?AV?$vector@Vplatform@_V1@sycl@@V?$allocator@Vplatform@_V1@sycl@@@std@@@std@@XZ
+?get_unsupported_platforms@platform@_V1@sycl@@SA?AV?$vector@Vplatform@_V1@sycl@@V?$allocator@Vplatform@_V1@sycl@@@std@@@std@@XZ
 ?get_pointer_device@_V1@sycl@@YA?AVdevice@12@PEBXAEBVcontext@12@@Z
 ?get_pointer_type@_V1@sycl@@YA?AW4alloc@usm@12@PEBXAEBVcontext@12@@Z
 ?get_precision@stream@_V1@sycl@@QEBA_KXZ

sycl/tools/sycl-ls/sycl-ls.cpp

@@ -14,7 +14,9 @@
 //   verbose (enabled with --verbose).
 //
 // In verbose mode it also prints, which devices would be chosen by various SYCL
-// device selectors.
+// device selectors. If the system has unsupported platforms (for instance
+// CUDA's OpenCL) those will also be listed in verbose mode, under "Unsupported
+// Platforms".
 //
 #include <sycl/sycl.hpp>
 
@@ -122,7 +124,8 @@ std::array<int, 2> GetNumberOfSubAndSubSubDevices(const device &Device) {
 }
 
 static void printDeviceInfo(const device &Device, bool Verbose,
-                            const std::string &Prepend) {
+                            const std::string &Prepend,
+                            bool IsUnsupported = false) {
   auto DeviceVersion = Device.get_info<info::device::version>();
   auto DeviceName = Device.get_info<info::device::name>();
   auto DeviceVendor = Device.get_info<info::device::vendor>();
@@ -157,19 +160,23 @@ static void printDeviceInfo(const device &Device, bool Verbose,
                 << std::endl;
     }
 
-    std::cout << Prepend << "Aspects           :";
+    // We don't expect to find info on aspects, device's sub-group size or
+    // architecture on non supported devices.
+    if (!IsUnsupported) {
+      std::cout << Prepend << "Aspects           :";
 #define __SYCL_ASPECT(ASPECT, ID)                                              \
   if (Device.has(aspect::ASPECT))                                              \
     std::cout << " " << #ASPECT;
 #include <sycl/info/aspects.def>
-    std::cout << std::endl;
-    auto sg_sizes = Device.get_info<info::device::sub_group_sizes>();
-    std::cout << Prepend << "info::device::sub_group_sizes:";
-    for (auto size : sg_sizes)
-      std::cout << " " << size;
-    std::cout << std::endl;
-    std::cout << Prepend << "Architecture: " << getArchName(Device)
-              << std::endl;
+      std::cout << std::endl;
+      auto sg_sizes = Device.get_info<info::device::sub_group_sizes>();
+      std::cout << Prepend << "info::device::sub_group_sizes:";
+      for (auto size : sg_sizes)
+        std::cout << " " << size;
+      std::cout << std::endl;
+      std::cout << Prepend << "Architecture: " << getArchName(Device)
+                << std::endl;
+    }
   } else {
     std::cout << Prepend << ", " << DeviceName << " " << DeviceVersion << " ["
               << DeviceDriverVersion << "]" << std::endl;
@@ -201,8 +208,11 @@ static int printUsageAndExit() {
             << std::endl;
   std::cout << "\n Options:" << std::endl;
   std::cout
-      << "\t --verbose " << "\t Verbosely prints all the discovered platforms. "
-      << "It also lists the device chosen by various SYCL device selectors."
+      << "\t --verbose "
+      << "\t Verbosely prints all the discovered platforms. "
+      << "It also lists the device chosen by various SYCL device "
+         "selectors. If the system contains unsupported platforms, those will "
+         "also be listed in verbose mode, under \"Unsupported Platforms\"."
       << std::endl;
   std::cout
       << "\t --ignore-device-selectors "
@@ -317,6 +327,38 @@ static int unsetFilterEnvVarsAndFork() {
 }
 #endif
 
+// NOTE: This function can update DeviceNums.
+static void printVerbosePlatformInfo(const std::vector<platform> &Platforms,
+                                     std::map<backend, size_t> &DeviceNums,
+                                     const bool SuppressNumberPrinting,
+                                     bool IsUnsupported = false) {
+  uint32_t PlatformNum = 0;
+  if (!SuppressNumberPrinting)
+    DeviceNums.clear();
+  for (const auto &Platform : Platforms) {
+    backend Backend = Platform.get_backend();
+    ++PlatformNum;
+    auto PlatformVersion = Platform.get_info<info::platform::version>();
+    auto PlatformName = Platform.get_info<info::platform::name>();
+    auto PlatformVendor = Platform.get_info<info::platform::vendor>();
+    std::cout << "Platform [#" << PlatformNum << "]:" << std::endl;
+    std::cout << "    Version  : " << PlatformVersion << std::endl;
+    std::cout << "    Name     : " << PlatformName << std::endl;
+    std::cout << "    Vendor   : " << PlatformVendor << std::endl;
+
+    const auto &Devices = Platform.get_devices();
+    std::cout << "    Devices  : " << Devices.size() << std::endl;
+    for (const auto &Device : Devices) {
+      if (!SuppressNumberPrinting) {
+        std::cout << "        Device [#" << DeviceNums[Backend]
+                  << "]:" << std::endl;
+        ++DeviceNums[Backend];
+      }
+      printDeviceInfo(Device, true, "        ", IsUnsupported);
+    }
+  }
+}
+
 int main(int argc, char **argv) {
 
   if (argc == 1) {
@@ -386,31 +428,14 @@ int main(int argc, char **argv) {
 
     if (verbose) {
       std::cout << "\nPlatforms: " << Platforms.size() << std::endl;
-      uint32_t PlatformNum = 0;
-      if (!SuppressNumberPrinting)
-        DeviceNums.clear();
-      for (const auto &Platform : Platforms) {
-        backend Backend = Platform.get_backend();
-        ++PlatformNum;
-        auto PlatformVersion = Platform.get_info<info::platform::version>();
-        auto PlatformName = Platform.get_info<info::platform::name>();
-        auto PlatformVendor = Platform.get_info<info::platform::vendor>();
-        std::cout << "Platform [#" << PlatformNum << "]:" << std::endl;
-        std::cout << "    Version  : " << PlatformVersion << std::endl;
-        std::cout << "    Name     : " << PlatformName << std::endl;
-        std::cout << "    Vendor   : " << PlatformVendor << std::endl;
-
-        const auto &Devices = Platform.get_devices();
-        std::cout << "    Devices  : " << Devices.size() << std::endl;
-        for (const auto &Device : Devices) {
-          if (!SuppressNumberPrinting) {
-            std::cout << "        Device [#" << DeviceNums[Backend]
-                      << "]:" << std::endl;
-            ++DeviceNums[Backend];
-          }
-          printDeviceInfo(Device, true, "        ");
-        }
-      }
+      printVerbosePlatformInfo(Platforms, DeviceNums, SuppressNumberPrinting);
+
+      const auto &UnsupportedPlatforms = platform::get_unsupported_platforms();
+      std::cout << "\nUnsupported Platforms: " << UnsupportedPlatforms.size()
+                << std::endl;
+      printVerbosePlatformInfo(UnsupportedPlatforms, DeviceNums,
+                               SuppressNumberPrinting, true);
+      std::cout << std::endl;
     } else {
       return EXIT_SUCCESS;
     }