drm/msm: add special _get_vaddr_active() for cmdstream dumps

Prep work for adding a debugfs file that dumps just submits which
trigger hangs/faults.  In this case the bo may already be in the
MADV_DONTNEED state, but will be still on the active list (since
the submit hasn't completed yet).  So the normal check that the
bo is in the WILLNEED state does not apply.  (But of course the bo
should definitely not be in the PURGED state!)

Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index a0ab604..0776160 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -470,14 +470,16 @@ fail:
 	return ret;
 }
 
-void *msm_gem_get_vaddr(struct drm_gem_object *obj)
+static void *get_vaddr(struct drm_gem_object *obj, unsigned madv)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	int ret = 0;
 
 	mutex_lock(&msm_obj->lock);
 
-	if (WARN_ON(msm_obj->madv != MSM_MADV_WILLNEED)) {
+	if (WARN_ON(msm_obj->madv > madv)) {
+		dev_err(obj->dev->dev, "Invalid madv state: %u vs %u\n",
+			msm_obj->madv, madv);
 		mutex_unlock(&msm_obj->lock);
 		return ERR_PTR(-EBUSY);
 	}
@@ -513,6 +515,22 @@ fail:
 	return ERR_PTR(ret);
 }
 
+void *msm_gem_get_vaddr(struct drm_gem_object *obj)
+{
+	return get_vaddr(obj, MSM_MADV_WILLNEED);
+}
+
+/*
+ * Don't use this!  It is for the very special case of dumping
+ * submits from GPU hangs or faults, were the bo may already
+ * be MSM_MADV_DONTNEED, but we know the buffer is still on the
+ * active list.
+ */
+void *msm_gem_get_vaddr_active(struct drm_gem_object *obj)
+{
+	return get_vaddr(obj, __MSM_MADV_PURGED);
+}
+
 void msm_gem_put_vaddr(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);