[Bug 295788] graphics/drm-kmod: i915kms Hardware acceleration not working for Intel Braswell since >drm-510-kmod

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295788

--- Comment #60 from Roger Olofsson <[email protected]> ---
Tried a small hack. 

Changed crocus_create_hw_context from calling intel_gem_create_context to
calling intel_gem_create_context_ext and set flags to 0 in crocus_bufmgr.c.

Fired up lldb and singlestepped until it broke on intel_ioctl. 

It appears to me that for this specific graphics card there is no difference
when using intel_gem_create_context vs using intel_gem_create_context_ext?

Process 1714 stopped
* thread #1, name = 'Xorg', stop reason = instruction step into
    frame #0: 0x0000000840fb7a40 crocus_dri.so`intel_ioctl(fd=17,
request=3222299757, arg=0x0000000820abcfc8) at intel_gem.h:83:15
   80       int ret;
   81  
   82       do {
-> 83           ret = ioctl(fd, request, arg);
   84       } while (ret == -1 && (errno == EINTR || errno == EAGAIN));
   85       return ret;
   86   }
(lldb) si
Process 1714 stopped
* thread #1, name = 'Xorg', stop reason = instruction step into
    frame #0: 0x0000000841752e30 crocus_dri.so`ioctl
crocus_dri.so`ioctl:
->  0x841752e30 <+0>:  jmpq   *0x6d352(%rip)
    0x841752e36 <+6>:  pushq  $0x14
    0x841752e3b <+11>: jmp    0x841752ce0

crocus_dri.so`dup:
    0x841752e40 <+0>:  jmpq   *0x6d34a(%rip)
(lldb) si
Process 1714 stopped
* thread #1, name = 'Xorg', stop reason = instruction step into
    frame #0: 0x0000000829e25a60 libc.so.7`__sys_ioctl at ioctl.S:4

Roger

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