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{
  "commit": "7755c301e942b11ff869cfa6df86c6f438e2e757",
  "tree": "4e7cd0d6a4030b6120d1ef995c540403565cb0e7",
  "parents": [
    "53daa9513bbc9c0dbbc1300a9337f263d151a0cb"
  ],
  "author": {
    "name": "Ben Vanik",
    "email": "ben.vanik@gmail.com",
    "time": "Thu Aug 21 08:30:16 2025 -0700"
  },
  "committer": {
    "name": "GitHub",
    "email": "noreply@github.com",
    "time": "Thu Aug 21 15:30:16 2025 +0000"
  },
  "message": "Adding iree_hal_device_queue_host_call and emulation.  (#21653)\n\nThis allows for both blocking and non-blocking device-\u003ehost calls.\n\nEmulation is provided targets that aren\u0027t yet using their native\nfeatures (CUDA/HIP/Metal) or don\u0027t have them (Vulkan), but it should\nnever be used once we start relying on this for programs as the\nperformance is terrible. The CPU sync and task implementations are done\nhere as the emulation is incompatible with sync semantics and it\u0027s\npossible to implement it on the task system fairly easily.\n\nI split out the existing queue emulation utilities out of the device.c\nso high-fidelity backends can eventually not even link that code in. I\nadded the host call emulation in its own target so we can avoid\nintroducing threading dependencies into `iree::hal` for the emulation\n(and makes it clearer what\u0027s part of the API vs what\u0027s an implementation\ndetail).\n\nI suspect there may be some HIP flakes and we can disable the CTS\nthere/file issues if they pop up. I think there\u0027s a few cases in the HIP\nsemaphore that don\u0027t quite work but it\u0027d be better to improve the\nsemaphore tests first. HIP is using an emulated host call here and\nthat\u0027s pretty much just a thread and some semaphores and should be\npossible to test independent of the host call logic.\n\nFixes #21631.",
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