drm/mm: Split up long running selftests with cond_resched()

Scatter a few cond_resched() in between phases of the drm_mm selftests
to try and prevent us incurring the wrath of the NMI watchdog.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170329091053.13837-1-chris@chris-wilson.co.uk

drivers/gpu/drm/selftests/test-drm_mm.c

@@ -514,6 +514,8 @@ static int igt_reserve(void *ignored)
 		ret = __igt_reserve(count, size + 1);
 		if (ret)
 			return ret;
+
+		cond_resched();
 	}
 
 	return 0;
@@ -712,6 +714,10 @@ static int igt_insert(void *ignored)
 			return ret;
 
 		ret = __igt_insert(count, size + 1, false);
+		if (ret)
+			return ret;
+
+		cond_resched();
 	}
 
 	return 0;
@@ -741,6 +747,10 @@ static int igt_replace(void *ignored)
 			return ret;
 
 		ret = __igt_insert(count, size + 1, true);
+		if (ret)
+			return ret;
+
+		cond_resched();
 	}
 
 	return 0;
@@ -1011,6 +1021,8 @@ static int igt_insert_range(void *ignored)
 		ret = __igt_insert_range(count, size, max/4+1, 3*max/4-1);
 		if (ret)
 			return ret;
+
+		cond_resched();
 	}
 
 	return 0;
@@ -1056,6 +1068,7 @@ static int igt_align(void *ignored)
 		drm_mm_for_each_node_safe(node, next, &mm)
 			drm_mm_remove_node(node);
 		DRM_MM_BUG_ON(!drm_mm_clean(&mm));
+		cond_resched();
 	}
 
 	ret = 0;
@@ -1097,6 +1110,8 @@ static int igt_align_pot(int max)
 			       align, bit);
 			goto out;
 		}
+
+		cond_resched();
 	}
 
 	ret = 0;
@@ -1471,6 +1486,8 @@ static int igt_evict(void *ignored)
 				goto out;
 			}
 		}
+
+		cond_resched();
 	}
 
 	ret = 0;
@@ -1566,6 +1583,8 @@ static int igt_evict_range(void *ignored)
 				goto out;
 			}
 		}
+
+		cond_resched();
 	}
 
 	ret = 0;
@@ -1683,6 +1702,7 @@ static int igt_topdown(void *ignored)
 		drm_mm_for_each_node_safe(node, next, &mm)
 			drm_mm_remove_node(node);
 		DRM_MM_BUG_ON(!drm_mm_clean(&mm));
+		cond_resched();
 	}
 
 	ret = 0;
@@ -1783,6 +1803,7 @@ static int igt_bottomup(void *ignored)
 		drm_mm_for_each_node_safe(node, next, &mm)
 			drm_mm_remove_node(node);
 		DRM_MM_BUG_ON(!drm_mm_clean(&mm));
+		cond_resched();
 	}
 
 	ret = 0;
@@ -1970,6 +1991,8 @@ static int igt_color(void *ignored)
 			drm_mm_remove_node(node);
 			kfree(node);
 		}
+
+		cond_resched();
 	}
 
 	ret = 0;
@@ -2047,6 +2070,7 @@ static int evict_color(struct drm_mm *mm,
 		}
 	}
 
+	cond_resched();
 	return 0;
 }
 
@@ -2132,6 +2156,8 @@ static int igt_color_evict(void *ignored)
 				goto out;
 			}
 		}
+
+		cond_resched();
 	}
 
 	ret = 0;
@@ -2231,6 +2257,8 @@ static int igt_color_evict_range(void *ignored)
 				goto out;
 			}
 		}
+
+		cond_resched();
 	}
 
 	ret = 0;