[all-commits] [llvm/llvm-project] 27d25d: [libc] Increase RPC opcode to 32-bit and use a cla...

[Joseph Huber via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 27d25d1c12a34d0cfd47416e77cd83b7b768f1e7
      https://github.com/llvm/llvm-project/commit/27d25d1c12a34d0cfd47416e77cd83b7b768f1e7
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2024-11-19 (Tue, 19 Nov 2024)

  Changed paths:
    M libc/docs/gpu/rpc.rst
    M libc/include/llvm-libc-types/rpc_opcodes_t.h
    M libc/src/__support/RPC/rpc.h
    M libc/src/stdio/gpu/file.h
    M libc/src/stdio/gpu/vfprintf_utils.h
    M libc/utils/gpu/server/llvmlibc_rpc_server.h
    M libc/utils/gpu/server/rpc_server.cpp

  Log Message:
  -----------
  [libc] Increase RPC opcode to 32-bit and use a class byte (#116905)

Summary:
Currently, the RPC interface uses a basic opcode to communicate with the
server. This currently is 16 bits. There's no reason for this to be 16
bits, because on the GPU a 32-bit write is the same as a 16-bit write
performance wise.

Additionally, I am now making all the `libc` based opcodes qualified
with the 'c' type, mimiciing how Linux handles `ioctls` all coming from
the same driver. This will make it easier to extend the interface when
it's exported directly.



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