Sync HIP documentation 2025-10-20 (#1258)

* Add examples to tools folder
* Correct P2P memory access section
* Sync poriting guide
* Add HIP Graph tutorial
* Add hint about using amdgpu-dkms for IPC API
* Add a few more env variables

projects/hip/docs/tools/example_codes/timer.hip

@@ -0,0 +1,66 @@
+// MIT License
+//
+// Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include <hip/hip_runtime.h>
+
+#include <cstdlib>
+#include <iostream>
+
+#define HIP_CHECK(expression)                \
+{                                            \
+    const hipError_t status = expression;    \
+    if(status != hipSuccess)                 \
+    {                                        \
+            std::cerr << "HIP error "        \
+                << status << ": "            \
+                << hipGetErrorString(status) \
+                << " at " << __FILE__ << ":" \
+                << __LINE__ << std::endl;    \
+    }                                        \
+}
+
+// [sphinx-kernel-start]
+__global__ void kernel()
+{
+  long long int start = clock64();
+  // kernel code
+  long long int stop = clock64();
+  long long int cycles = stop - start;
+}
+// [sphinx-kernel-end]
+
+int main()
+{
+    int deviceId = 0;
+
+    // [sphinx-query-start]
+    int wallClkRate = 0; //in kilohertz
+    HIP_CHECK(hipDeviceGetAttribute(&wallClkRate, hipDeviceAttributeWallClockRate, deviceId));
+    // [sphinx-query-end]
+
+    kernel<<<dim3{1, 1, 1}, dim3{32,1,1}>>>();
+    HIP_CHECK(hipDeviceSynchronize());
+
+    std::cout << "Device's wall clock rate is " << wallClkRate << " kHz." << std::endl;
+
+    return EXIT_SUCCESS;
+}