On Wed, Sep 09, 2015 at 11:29:52AM +0100, Michel Thierry wrote: > i915_gem_object_bind_to_vm returns -E2BIG when the user tries to bind an > object larger than the aperture, but i915_gem_fault does not handle this > return code: > > [501906.530985] gem_mmap_gtt: starting subtest big-bo-tiledX > [501906.541992] gem_mmap_gtt (22362): drop_caches: 3 > [501906.610774] WARNING: CPU: 2 PID: 22362 at > drivers/gpu/drm/i915/i915_gem.c:1880 i915_gem_fault+0x24f/0x470 [i915]() > [501906.623568] unhandled error in i915_gem_fault: -7 > [501906.825115] Call Trace: > [501906.830322] [<ffffffff8178ffcc>] dump_stack+0x45/0x57 > [501906.838589] [<ffffffff810759aa>] warn_slowpath_common+0x8a/0xc0 > [501906.847846] [<ffffffff81075a26>] warn_slowpath_fmt+0x46/0x50 > [501906.856776] [<ffffffffc079591f>] i915_gem_fault+0x24f/0x470 [i915] > [501906.866276] [<ffffffff8119e11d>] __do_fault+0x3d/0xa0 > [501906.874464] [<ffffffff81068cc0>] ? pte_alloc_one+0x30/0x50 > [501906.883169] [<ffffffff811a26a7>] handle_mm_fault+0xe27/0x1810 > [501906.892202] [<ffffffff81306e8a>] ? security_mmap_file+0xca/0xe0 > [501906.900389] [<ffffffff811fb6ad>] ? do_vfs_ioctl+0x2cd/0x4b0 > [501906.908143] [<ffffffff81063ada>] __do_page_fault+0x19a/0x430 > [501906.916024] [<ffffffff81063d92>] do_page_fault+0x22/0x30 > [501906.923532] [<ffffffff81799248>] page_fault+0x28/0x30 > > RFC about the error code that should be returned by i915_gem_fault. There are two fixes here, change E2BIG to ENOSPC. The differentiate is painful to all consumers (and missing in userspace). The second is that gem_fault was supposed to be fixed to handle it and sigbus is the legimate error for that case (not enomem/sigsegv). -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
