drm/msm: Add msm_gem_get_and_pin_iova()

Add a new function to get and pin the iova memory in one
step (basically renaming the old msm_gem_get_iova function)
and switch msm_gem_get_iova() to only allocate an iova but
not map it in the IOMMU. This is only currently used by
msm_ioctl_gem_info() since all other users of of the iova
expect that the memory be immediately available.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -209,7 +209,8 @@ int adreno_hw_init(struct msm_gpu *gpu)
 		if (!ring)
 			continue;
 
-		ret = msm_gem_get_iova(ring->bo, gpu->aspace, &ring->iova);
+		ret = msm_gem_get_and_pin_iova(ring->bo, gpu->aspace,
+			&ring->iova);
 		if (ret) {
 			ring->iova = 0;
 			DRM_DEV_ERROR(gpu->dev->dev,

drivers/gpu/drm/msm/disp/mdp4/mdp4_crtc.c

@@ -384,7 +384,7 @@ static void update_cursor(struct drm_crtc *crtc)
 		if (next_bo) {
 			/* take a obj ref + iova ref when we start scanning out: */
 			drm_gem_object_get(next_bo);
-			msm_gem_get_iova(next_bo, kms->aspace, &iova);
+			msm_gem_get_and_pin_iova(next_bo, kms->aspace, &iova);
 
 			/* enable cursor: */
 			mdp4_write(mdp4_kms, REG_MDP4_DMA_CURSOR_SIZE(dma),
@@ -442,7 +442,7 @@ static int mdp4_crtc_cursor_set(struct drm_crtc *crtc,
 	}
 
 	if (cursor_bo) {
-		ret = msm_gem_get_iova(cursor_bo, kms->aspace, &iova);
+		ret = msm_gem_get_and_pin_iova(cursor_bo, kms->aspace, &iova);
 		if (ret)
 			goto fail;
 	} else {

drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c

@@ -538,7 +538,7 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev)
 		goto fail;
 	}
 
-	ret = msm_gem_get_iova(mdp4_kms->blank_cursor_bo, kms->aspace,
+	ret = msm_gem_get_and_pin_iova(mdp4_kms->blank_cursor_bo, kms->aspace,
 			&mdp4_kms->blank_cursor_iova);
 	if (ret) {
 		DRM_DEV_ERROR(dev->dev, "could not pin blank-cursor bo: %d\n", ret);

drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c

@@ -903,7 +903,7 @@ static int mdp5_crtc_cursor_set(struct drm_crtc *crtc,
 	if (!cursor_bo)
 		return -ENOENT;
 
-	ret = msm_gem_get_iova(cursor_bo, kms->aspace,
+	ret = msm_gem_get_and_pin_iova(cursor_bo, kms->aspace,
 			&mdp5_crtc->cursor.iova);
 	if (ret)
 		return -EINVAL;

drivers/gpu/drm/msm/dsi/dsi_host.c

@@ -1248,7 +1248,7 @@ int dsi_dma_base_get_6g(struct msm_dsi_host *msm_host, uint64_t *dma_base)
 	if (!dma_base)
 		return -EINVAL;
 
-	return msm_gem_get_iova(msm_host->tx_gem_obj,
+	return msm_gem_get_and_pin_iova(msm_host->tx_gem_obj,
 				priv->kms->aspace, dma_base);
 }
 

drivers/gpu/drm/msm/msm_drv.c

@@ -868,6 +868,10 @@ static int msm_ioctl_gem_info_iova(struct drm_device *dev,
 	if (!priv->gpu)
 		return -EINVAL;
 
+	/*
+	 * Don't pin the memory here - just get an address so that userspace can
+	 * be productive
+	 */
 	return msm_gem_get_iova(obj, priv->gpu->aspace, iova);
 }
 

drivers/gpu/drm/msm/msm_drv.h

@@ -271,6 +271,8 @@ vm_fault_t msm_gem_fault(struct vm_fault *vmf);
 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
 int msm_gem_get_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova);
+int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova);
 uint64_t msm_gem_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace);
 struct page **msm_gem_get_pages(struct drm_gem_object *obj);

drivers/gpu/drm/msm/msm_fb.c

@@ -66,7 +66,7 @@ int msm_framebuffer_prepare(struct drm_framebuffer *fb,
 	uint64_t iova;
 
 	for (i = 0; i < n; i++) {
-		ret = msm_gem_get_iova(fb->obj[i], aspace, &iova);
+		ret = msm_gem_get_and_pin_iova(fb->obj[i], aspace, &iova);
 		DBG("FB[%u]: iova[%d]: %08llx (%d)", fb->base.id, i, iova, ret);
 		if (ret)
 			return ret;

drivers/gpu/drm/msm/msm_fbdev.c

@@ -104,7 +104,7 @@ static int msm_fbdev_create(struct drm_fb_helper *helper,
 	 * in panic (ie. lock-safe, etc) we could avoid pinning the
 	 * buffer now:
 	 */
-	ret = msm_gem_get_iova(bo, priv->kms->aspace, &paddr);
+	ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
 	if (ret) {
 		DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 		goto fail_unlock;

drivers/gpu/drm/msm/msm_gem.c

@@ -408,9 +408,8 @@ static int msm_gem_pin_iova(struct drm_gem_object *obj,
 			obj->size >> PAGE_SHIFT);
 }
 
-
-/* get iova, taking a reference.  Should have a matching put */
-int msm_gem_get_iova(struct drm_gem_object *obj,
+/* get iova and pin it. Should have a matching put */
+int msm_gem_get_and_pin_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace, uint64_t *iova)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
@@ -431,8 +430,23 @@ int msm_gem_get_iova(struct drm_gem_object *obj,
 	return ret;
 }
 
+/* Get an iova but don't pin the memory behind it */
+int msm_gem_get_iova(struct drm_gem_object *obj,
+		struct msm_gem_address_space *aspace, uint64_t *iova)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	int ret;
+
+	mutex_lock(&msm_obj->lock);
+	ret = msm_gem_get_iova_locked(obj, aspace, iova);
+	mutex_unlock(&msm_obj->lock);
+
+	return ret;
+}
+
+
 /* get iova without taking a reference, used in places where you have
- * already done a 'msm_gem_get_iova()'.
+ * already done a 'msm_gem_get_and_pin_iova' or 'msm_gem_get_iova'
  */
 uint64_t msm_gem_iova(struct drm_gem_object *obj,
 		struct msm_gem_address_space *aspace)
@@ -1072,7 +1086,7 @@ static void *_msm_gem_kernel_new(struct drm_device *dev, uint32_t size,
 		return ERR_CAST(obj);
 
 	if (iova) {
-		ret = msm_gem_get_iova(obj, aspace, iova);
+		ret = msm_gem_get_and_pin_iova(obj, aspace, iova);
 		if (ret)
 			goto err;
 	}

drivers/gpu/drm/msm/msm_gem_submit.c

@@ -270,7 +270,7 @@ static int submit_pin_objects(struct msm_gem_submit *submit)
 		uint64_t iova;
 
 		/* if locking succeeded, pin bo: */
-		ret = msm_gem_get_iova(&msm_obj->base,
+		ret = msm_gem_get_and_pin_iova(&msm_obj->base,
 				submit->gpu->aspace, &iova);
 
 		if (ret)

drivers/gpu/drm/msm/msm_gpu.c

@@ -773,7 +773,7 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 
 		/* submit takes a reference to the bo and iova until retired: */
 		drm_gem_object_get(&msm_obj->base);
-		msm_gem_get_iova(&msm_obj->base,
+		msm_gem_get_and_pin_iova(&msm_obj->base,
 				submit->gpu->aspace, &iova);
 
 		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)