[Mesa-dev] [PATCH] intel_stub: Claim to support I915_PARAM_HAS_CONTEXT_ISOLATION.

Kenneth Graunke kenneth at whitecape.org
Thu Jul 26 23:13:40 UTC 2018

Modern kernels support I915_PARAM_HAS_CONTEXT_ISOLATION, which allows
us to whack certain context registers with impunity.  One of those is
INSTPM/CS_DEBUG_MODE2, which controls whether Constant Buffer 0 is
relative to dynamic state base address, or a general GPU address.
If it's relative (the default), we can only push 3 ranges of UBOs.
If it's absolute, we can push 4.  So this affects our shader output.

Follow the behavior of modern kernels and allow us to push all 4 ranges.
 intel_stub.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/intel_stub.c b/intel_stub.c
index a3316b1..8b8db64 100644
--- a/intel_stub.c
+++ b/intel_stub.c
@@ -262,6 +262,7 @@ ioctl(int fd, unsigned long request, ...)
                         case I915_PARAM_HAS_RELAXED_DELTA:
                         case I915_PARAM_HAS_WAIT_TIMEOUT:
                         case I915_PARAM_HAS_EXEC_NO_RELOC:
+                        case I915_PARAM_HAS_CONTEXT_ISOLATION:
                                 *getparam->value = 1;
                         case I915_PARAM_CHIPSET_ID:

More information about the mesa-dev mailing list