host: make system blob memory work on macOS - #182
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With system blobs, host visible memory is shared memory imported as a host pointer, and Metal cannot bind a tiled image to that. A device that reports one unified memory type, as kosmickrisp does, then has nowhere to put an image, and kk_image_plane_bind asserts on the first one. Add a guest only type in that case: device local, first in the list so that it is what an image is given, allocating from the same host type without host visible emulation. Memory requirements include it wherever the host type is allowed. MoltenVK reports a device local only type of its own, so nothing changes there.
System blob memory is named shared-memory-vk-N with a per process counter and opened without O_EXCL. A server that is killed leaves its objects behind, the next one reuses the names, and on macOS an object that already has a size cannot be resized: ftruncate fails with EINVAL and vkAllocateMemory fails. Put the pid in the name, and on Apple unlink the object as soon as it exists; the descriptor keeps it alive and is what the guest is handed.
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Two host fixes for running the guest Vulkan driver through kumquat on macOS.
Both only take effect with SystemBlob enabled.
vulkan: add a guest only device local memory type when the host reports a
single host visible unified type. Metal cannot bind a tiled image to an
imported host pointer; this gives images ordinary device memory. Unit test
added.
base: put the pid in the shared memory name and unlink it on creation, so a
killed server does not leave objects that make the next ftruncate fail.
Tested with bazel test //host/vulkan:gfxstream_emulatedphysicalmemory_tests,
and vulkaninfo, vkcube and a dEQP-VK smoke run on kosmickrisp and MoltenVK.