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/explicit_copy.cpp

@@ -0,0 +1,58 @@
+// 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 "example_utils.hpp"
+
+#include <hip/hip_runtime.h>
+
+#include <cstddef>
+#include <cstdlib>
+#include <iostream>
+
+int main()
+{
+    // [sphinx-start]
+    std::size_t elements = 1 << 20;
+    std::size_t size_bytes = elements * sizeof(int);
+
+    // allocate host and device memory
+    int *host_pointer = new int[elements];
+    int *device_input, *device_result;
+    HIP_CHECK(hipMalloc(&device_input, size_bytes));
+    HIP_CHECK(hipMalloc(&device_result, size_bytes));
+
+    // copy from host to the device
+    HIP_CHECK(hipMemcpy(device_input, host_pointer, size_bytes, hipMemcpyHostToDevice));
+
+    // Use memory on the device, i.e. execute kernels
+
+    // copy from device to host, to e.g. get results from the kernel
+    HIP_CHECK(hipMemcpy(host_pointer, device_result, size_bytes, hipMemcpyDeviceToHost));
+
+    // free memory when not needed any more
+    HIP_CHECK(hipFree(device_result));
+    HIP_CHECK(hipFree(device_input));
+    delete[] host_pointer;
+    // [sphinx-end]
+
+    return EXIT_SUCCESS;
+}