diff options
Diffstat (limited to 'lib/igt_gt.c')
| -rw-r--r-- | lib/igt_gt.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/lib/igt_gt.c b/lib/igt_gt.c index 95d74a0c..a3d6a731 100644 --- a/lib/igt_gt.c +++ b/lib/igt_gt.c @@ -181,16 +181,31 @@ igt_hang_ring_t igt_hang_ctx(int fd, exec.relocs_ptr = (uintptr_t)&reloc; memset(b, 0xc5, sizeof(b)); - b[0] = 0xffffffff; + + /* + * We emit invalid command to provoke a gpu hang. + * If that doesn't work, we do bb start loop. + * Note that the bb start aligment is illegal due this. + * But hey, we are here to hang the gpu so whatever works. + * We skip 0xfffffff on gen9 as it confuses hw in an such a way that + * it will skip over the bb start, causing runaway head and + * thus much slower hang detection. + */ len = 2; - if (intel_gen(intel_get_drm_devid(fd)) >= 8) + if (intel_gen(intel_get_drm_devid(fd)) >= 8) { + b[0] = MI_NOOP; len++; + } else { + b[0] = 0xffffffff; + } + b[1] = MI_BATCH_BUFFER_START | (len - 2); b[1+len] = MI_BATCH_BUFFER_END; b[2+len] = MI_NOOP; gem_write(fd, exec.handle, 0, b, sizeof(b)); reloc.offset = 8; + reloc.delta = 4; reloc.target_handle = exec.handle; reloc.read_domains = I915_GEM_DOMAIN_COMMAND; |