[Intel-gfx] [PATCH v2] drm/i915: Reinstate the mmap ioctl for some platforms

[Daniel Vetter]

On Fri, Jun 25, 2021 at 9:48 AM Maarten Lankhorst
<maarten.lankhorst at linux.intel.com> wrote:
>
> Op 24-06-2021 om 14:04 schreef Daniel Vetter:
> > On Thu, Jun 24, 2021 at 1:29 PM Thomas Hellström
> > <thomas.hellstrom at linux.intel.com> wrote:
> >> Reinstate the mmap ioctl for all current integrated platforms.
> >> The intention was really to have it disabled for discrete graphics
> >> where we enforce a single mmap mode.
> >>
> >> Fixes: 35cbd91eb541 ("drm/i915: Disable mmap ioctl for gen12+")
> >> Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> >> Reviewed-by: Matthew Auld <matthew.auld at intel.com>
> > Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> >
> >> ---
> >> v2:
> >> - Added a R-B.
> >> - Fixed up the code comment a bit.
> >> ---
> >>  drivers/gpu/drm/i915/gem/i915_gem_mman.c | 7 ++++---
> >>  1 file changed, 4 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
> >> index 2fd155742bd2..4f50a508c7a0 100644
> >> --- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
> >> +++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
> >> @@ -62,10 +62,11 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
> >>         struct drm_i915_gem_object *obj;
> >>         unsigned long addr;
> >>
> >> -       /* mmap ioctl is disallowed for all platforms after TGL-LP.  This also
> >> -        * covers all platforms with local memory.
> >> +       /*
> >> +        * mmap ioctl is disallowed for all discrete platforms,
> >> +        * and for all platforms with GRAPHICS_VER > 12.
> >>          */
> >> -       if (GRAPHICS_VER(i915) >= 12 && !IS_TIGERLAKE(i915))
> >> +       if (IS_DGFX(i915) || GRAPHICS_VER(i915) > 12)
> >>                 return -EOPNOTSUPP;
> >>
> >>         if (args->flags & ~(I915_MMAP_WC))
> >> --
> >> 2.31.1
> >>
> >
> Would keeping this change unapplied break any currently shipping platforms? If not, could we leave it as-is?

It breaks media on rkl/adl afaik. Which should be part of the commit message.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch