On Tue, Apr 28, 2015 at 08:48:03AM +0100, Chris Wilson wrote: > This is the wrong layer to apply an arbitrary restriction and the wrong > error code (object too large!). If we do want to prevent large offsets > being return to the user on 32bit systems (to hide bugs in userspace), > you want to restrict the drm_mm range manager instead. This first tells > userspace about the correct size of the GTT they can use (so they don't > try and overallocate object or batches), and fixes the eviction logic to > avoid the eventual and *guaranteed* error. > > Fixes regression in > commit d7b2633dba04ef0fd7385f02a7b552abc5f1062f > Author: Michel Thierry <michel.thie...@intel.com> > Date: Wed Apr 8 12:13:34 2015 +0100 > > drm/i915/gen8: Dynamic page table allocations > > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> > Cc: Michel Thierry <michel.thie...@intel.com> > Cc: Mika Kuoppala <mika.kuopp...@intel.com> > Cc: Daniel Vetter <daniel.vet...@ffwll.ch> > --- > drivers/gpu/drm/i915/i915_gem_gtt.c | 9 --------- > 1 file changed, 9 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c > b/drivers/gpu/drm/i915/i915_gem_gtt.c > index 968e8f9dc6dd..e96a694413a6 100644 > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c > @@ -844,15 +844,6 @@ static int gen8_alloc_va_range(struct i915_address_space > *vm, > uint32_t pdpe; > int ret; > > -#ifndef CONFIG_64BIT > - /* Disallow 64b address on 32b platforms. Nothing is wrong with doing > - * this in hardware, but a lot of the drm code is not prepared to handle > - * 64b offset on 32b platforms. > - * This will be addressed when 48b PPGTT is added */ > - if (start + length > 0x100000000ULL) > - return -E2BIG; > -#endif
Aggreed, we already limit the ggtt size appropriately. If this would slip through it'd be a bug in drm_mm. Queued for -next, thanks for the patch. -Daniel > - > /* Wrap is never okay since we can only represent 48b, and we don't > * actually use the other side of the canonical address space. > */ > -- > 2.1.4 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
