[Intel-gfx] [PATCH v4 37/38] drm/i915: Add support for retro-actively banning batch buffers

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

If a given context submits too many hanging batch buffers then it will
be banned and no further batch buffers will be accepted for it.
However, it is possible that a large number of buffers may already
have been accepted and are sat in the scheduler waiting to be
executed. This patch adds a late ban check to ensure that these will
also be discarded.

v4: New patch in series.

For: VIZ-1587
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 6 ++++++
 drivers/gpu/drm/i915/intel_lrc.c           | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 069a0a4..cb076e1 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1244,6 +1244,12 @@ int i915_gem_ringbuffer_submission_final(struct i915_execbuffer_params *params)
 	/* The mutex must be acquired before calling this function */
 	WARN_ON(!mutex_is_locked(&params->dev->struct_mutex));
 
+	/* Check the context wasn't banned between submission and execution: */
+	if (params->ctx->hang_stats.banned) {
+		DRM_DEBUG("Trying to execute for banned context!\n");
+		return -ENOENT;
+	}
+
 	/* Make sure the request's seqno is the latest and greatest: */
 	if (req->reserved_seqno != dev_priv->last_seqno) {
 		ret = i915_gem_get_seqno(ring->dev, &req->reserved_seqno);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ae5dd0a..b2861aa 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -958,6 +958,12 @@ int intel_execlists_submission_final(struct i915_execbuffer_params *params)
 	/* The mutex must be acquired before calling this function */
 	WARN_ON(!mutex_is_locked(&params->dev->struct_mutex));
 
+	/* Check the context wasn't banned between submission and execution: */
+	if (params->ctx->hang_stats.banned) {
+		DRM_DEBUG("Trying to execute for banned context!\n");
+		return -ENOENT;
+	}
+
 	/* Make sure the request's seqno is the latest and greatest: */
 	if (req->reserved_seqno != dev_priv->last_seqno) {
 		ret = i915_gem_get_seqno(ring->dev, &req->reserved_seqno);
-- 
1.9.1