From: Rob Clark <robdclark@gmail.com>
Date: Fri, 15 Sep 2017 08:38:20 -0400
Subject: drm/msm: add special _get_vaddr_active() for cmdstream dumps
Git-commit: fad33f4b1073a423a9ecd2a335de05e7a3ec1f37
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/msm/msm_drv.h |    1 +
 drivers/gpu/drm/msm/msm_gem.c |   22 ++++++++++++++++++++--
 drivers/gpu/drm/msm/msm_rd.c  |    2 +-
 3 files changed, 22 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -213,6 +213,7 @@ struct drm_gem_object *msm_gem_prime_imp
 int msm_gem_prime_pin(struct drm_gem_object *obj);
 void msm_gem_prime_unpin(struct drm_gem_object *obj);
 void *msm_gem_get_vaddr(struct drm_gem_object *obj);
+void *msm_gem_get_vaddr_active(struct drm_gem_object *obj);
 void msm_gem_put_vaddr(struct drm_gem_object *obj);
 int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv);
 int msm_gem_sync_object(struct drm_gem_object *obj,
--- 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);
--- a/drivers/gpu/drm/msm/msm_rd.c
+++ b/drivers/gpu/drm/msm/msm_rd.c
@@ -294,7 +294,7 @@ static void snapshot_buf(struct msm_rd_s
 	if (!(submit->bos[idx].flags & MSM_SUBMIT_BO_READ))
 		return;
 
-	buf = msm_gem_get_vaddr(&obj->base);
+	buf = msm_gem_get_vaddr_active(&obj->base);
 	if (IS_ERR(buf))
 		return;