[Bug 206711] Export linux_ioctl_{,un}register_handler from linux64 for x11/nvidia-driver

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206711

            Bug ID: 206711
           Summary: Export linux_ioctl_{,un}register_handler from linux64
                    for x11/nvidia-driver
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: Ultima1252 at gmail.com, danfe at FreeBSD.org,
                    dchagin at FreeBSD.org, ohartman at zedat.fu-berlin.de

Created attachment 166235
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=166235&action=edit
[workaround] nvidia linux_ioctl global handler (for both linux and linux64)

(In reply to ohartman from bug 201340 comment #17)
> on CURRENT amd64 I would at least expect linux64.ko

nvidia-driver requires kernel to provide linux_ioctl_{,un}register_handler to
allow linux userland access /dev/nvidia*. According to
/sys/modules/linux/Makefile the symbol is only exported for 32bit version.
Obviously, linux64 needs to export 64bit symbol. And its not possible to export
by building into kernel: option COMPAT_LINUX doesn't exist on amd64.

How to make 64bit OpenGL apps work with nvidia & linuxulator:
1. Switch to 64bit linux_base or populate manually (I've used CentOS 7)
2. Apply *attached* patch and rebuild kernel or just linux* modules
3. Disable linux_ioctl handler in nvidia-driver (i.e. rebuild with LINUX=off)
4. Install 64bit linux driver under /compat/linux
5. Remove sbin/nvidia-modprobe binary to enable userland fallback (as used by
FreeBSD driver)

CUDA 64bit may still not work e.g.,

  $ export PATH=/compat/linux/bin:/usr/local/cuda/bin:$PATH
  $ nvcc -o foo -m32 -lcuda a.c
  $ nvcc -o bar -lcuda a.c

  $ ./foo
  $ ./bar
  cuInit failed: 999

  $ cat a.c
  #include <cuda.h>
  #include <stdio.h>

  int main()
  {
      CUresult r = cuInit(0);
      if (r != CUDA_SUCCESS) {
          printf("cuInit failed: %d\n", r);
          return 1;
      }
      return 0;
  }

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