untrusted comment: verify with openbsd-68-base.pub
RWQZj25CSG5R2mhu6ysq+2q42V7hPMLeKUV6DmxLM+8u8Gn701REbmm9juhggMukzTzqGUu+HB7wbJTUz3v4UjgDA6Rj5Loi1Ak=

OpenBSD 6.8 errata 024, June 8, 2021:

Disable PPGTT on Intel machines with cherryview/braswell graphics
to avoid memory corruption.

Apply by doing:
   signify -Vep /etc/signify/openbsd-68-base.pub -x 024_inteldrm.patch.sig \
       -m - | (cd /usr/src && patch -p0)

And then rebuild and install a new kernel:
   KK=`sysctl -n kern.osversion | cut -d# -f1`
   cd /usr/src/sys/arch/`machine`/compile/$KK
   make obj
   make config
   make
   make install

Index: sys/dev/pci/drm/i915/i915_pci.c
===================================================================
RCS file: /cvs/src/sys/dev/pci/drm/i915/i915_pci.c,v
diff -u -p -r1.4 i915_pci.c
--- sys/dev/pci/drm/i915/i915_pci.c     1 Jul 2020 02:08:14 -0000       1.4
+++ sys/dev/pci/drm/i915/i915_pci.c     4 Jun 2021 03:44:03 -0000
@@ -598,7 +598,15 @@ static const struct intel_device_info ch
       .has_logical_ring_contexts = 0,
#endif
       .display.has_gmch = 1,
+#ifdef __linux__
       .ppgtt_type = INTEL_PPGTT_ALIASING,
+#else
+       /*
+        * Enabling aliasing ppgtt results in struct gen6_ppgtt
+        * being overwritten.
+        */
+       .ppgtt_type = INTEL_PPGTT_NONE,
+#endif
       .ppgtt_size = 32,
       .has_reset_engine = 1,
       .has_snoop = true,

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.