[PATCH 4/6] drm/msm: Map buffers on demand on the submit path

[Jordan Crouse]

From: Sushmita Susheelendra <ssusheel at codeaurora.org>

Map and pin buffers on demand on the submission path.
This ensures that we only map buffers whose iova are
actually needed for submission as opposed to all
buffers in the buffer list. For instance, the command
buffers, and the reloc buffers for processing relocs.
Also remove unused member valid from the struct
msm_gem_submit.

Signed-off-by: Sushmita Susheelendra <ssusheel at codeaurora.org>
Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
---
 drivers/gpu/drm/msm/msm_gem_submit.c | 58 +++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 2d2aa65..47a9e87 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -256,41 +256,38 @@ static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
 	return ret;
 }
 
-static int submit_pin_objects(struct msm_gem_submit *submit)
+static int submit_pin_object(struct msm_gem_submit *submit, int i)
 {
-	int i, ret = 0;
-
-	submit->valid = true;
-
-	for (i = 0; i < submit->nr_bos; i++) {
-		struct msm_gem_object *msm_obj = submit->bos[i].obj;
-		uint64_t iova;
+	struct msm_gem_object *msm_obj = submit->bos[i].obj;
+	uint64_t iova;
+	int ret;
 
-		/* if locking succeeded, pin bo: */
-		ret = msm_gem_get_iova(&msm_obj->base,
-				submit->gpu->aspace, &iova);
+	if (submit->bos[i].flags & BO_PINNED)
+		return 0;
 
-		if (ret)
-			break;
+	/* if locking succeeded, pin bo: */
+	ret = msm_gem_get_iova(&msm_obj->base, submit->gpu->aspace, &iova);
+	if (ret)
+		return ret;
 
-		submit->bos[i].flags |= BO_PINNED;
+	submit->bos[i].flags |= BO_PINNED;
 
-		if (iova == submit->bos[i].iova) {
-			submit->bos[i].flags |= BO_VALID;
-		} else {
-			submit->bos[i].iova = iova;
-			/* iova changed, so address in cmdstream is not valid: */
-			submit->bos[i].flags &= ~BO_VALID;
-			submit->valid = false;
-		}
+	if (iova == submit->bos[i].iova) {
+		submit->bos[i].flags |= BO_VALID;
+	} else {
+		submit->bos[i].iova = iova;
+		/* iova changed, so address in cmdstream is not valid: */
+		submit->bos[i].flags &= ~BO_VALID;
 	}
 
-	return ret;
+	return 0;
 }
 
 static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 		struct msm_gem_object **obj, uint64_t *iova, bool *valid)
 {
+	int ret;
+
 	if (idx >= submit->nr_bos) {
 		DRM_ERROR("invalid buffer index: %u (out of %u)\n",
 				idx, submit->nr_bos);
@@ -299,6 +296,14 @@ static int submit_bo(struct msm_gem_submit *submit, uint32_t idx,
 
 	if (obj)
 		*obj = submit->bos[idx].obj;
+
+	if (!iova && !valid)
+		return 0;
+
+	ret = submit_pin_object(submit, idx);
+	if (ret)
+		return ret;
+
 	if (iova)
 		*iova = submit->bos[idx].iova;
 	if (valid)
@@ -482,10 +487,6 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 	if (ret)
 		goto out;
 
-	ret = submit_pin_objects(submit);
-	if (ret)
-		goto out;
-
 	for (i = 0; i < args->nr_cmds; i++) {
 		struct drm_msm_gem_submit_cmd submit_cmd;
 		void __user *userptr =
@@ -536,9 +537,6 @@ int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
 		submit->cmd[i].iova = iova + submit_cmd.submit_offset;
 		submit->cmd[i].idx  = submit_cmd.submit_idx;
 
-		if (submit->valid)
-			continue;
-
 		ret = submit_reloc(submit, msm_obj, submit_cmd.submit_offset,
 				submit_cmd.nr_relocs, submit_cmd.relocs);
 		if (ret)
-- 
1.9.1