[PATCH] drm/msm: Separate locking of buffer resources from struct_mutex

* [PATCH] drm/msm: Separate locking of buffer resources from struct_mutex
@ 2017-06-13 22:52 Sushmita Susheelendra
       [not found] ` <1497394374-19982-1-git-send-email-ssusheel-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
                   ` (2 more replies)
  0 siblings, 3 replies; 13+ messages in thread
From: Sushmita Susheelendra @ 2017-06-13 22:52 UTC (permalink / raw)
  To: freedreno; +Cc: linux-arm-msm, dri-devel, Sushmita Susheelendra

Buffer object specific resources like pages, domains, sg list
need not be protected with struct_mutex. They can be protected
with a buffer object level lock. This simplifies locking and
makes it easier to avoid potential recursive locking scenarios
for SVM involving mmap_sem and struct_mutex. This also removes
unnecessary serialization when creating buffer objects, and also
between buffer object creation and GPU command submission.

Change-Id: I4fba9f8c38a6cd13f80f660639d1e74d4336e3fb
Signed-off-by: Sushmita Susheelendra <ssusheel@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c    |   2 -
 drivers/gpu/drm/msm/adreno/a5xx_power.c  |   2 -
 drivers/gpu/drm/msm/adreno/adreno_gpu.c  |   2 -
 drivers/gpu/drm/msm/dsi/dsi_host.c       |   5 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c |   2 +-
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c  |   2 -
 drivers/gpu/drm/msm/msm_drv.c            |   1 +
 drivers/gpu/drm/msm/msm_drv.h            |   7 +-
 drivers/gpu/drm/msm/msm_fbdev.c          |   6 +-
 drivers/gpu/drm/msm/msm_gem.c            | 190 +++++++++++++++----------------
 drivers/gpu/drm/msm/msm_gem.h            |   2 +
 drivers/gpu/drm/msm/msm_gem_submit.c     |   6 +-
 drivers/gpu/drm/msm/msm_gem_vma.c        |  10 +-
 drivers/gpu/drm/msm/msm_gpu.c            |   4 +-
 drivers/gpu/drm/msm/msm_rd.c             |   4 +-
 drivers/gpu/drm/msm/msm_ringbuffer.c     |   2 +-
 16 files changed, 120 insertions(+), 127 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 31a9bce..7893de1 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -235,9 +235,7 @@ static struct drm_gem_object *a5xx_ucode_load_bo(struct msm_gpu *gpu,
 	struct drm_gem_object *bo;
 	void *ptr;
 
-	mutex_lock(&drm->struct_mutex);
 	bo = msm_gem_new(drm, fw->size - 4, MSM_BO_UNCACHED);
-	mutex_unlock(&drm->struct_mutex);
 
 	if (IS_ERR(bo))
 		return bo;
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_power.c b/drivers/gpu/drm/msm/adreno/a5xx_power.c
index 72d52c7..eb88f44 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_power.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_power.c
@@ -294,9 +294,7 @@ void a5xx_gpmu_ucode_init(struct msm_gpu *gpu)
 	 */
 	bosize = (cmds_size + (cmds_size / TYPE4_MAX_PAYLOAD) + 1) << 2;
 
-	mutex_lock(&drm->struct_mutex);
 	a5xx_gpu->gpmu_bo = msm_gem_new(drm, bosize, MSM_BO_UNCACHED);
-	mutex_unlock(&drm->struct_mutex);
 
 	if (IS_ERR(a5xx_gpu->gpmu_bo))
 		goto err;
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 5b63fc6..1162c15 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -392,10 +392,8 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 			return ret;
 	}
 
-	mutex_lock(&drm->struct_mutex);
 	adreno_gpu->memptrs_bo = msm_gem_new(drm, sizeof(*adreno_gpu->memptrs),
 			MSM_BO_UNCACHED);
-	mutex_unlock(&drm->struct_mutex);
 	if (IS_ERR(adreno_gpu->memptrs_bo)) {
 		ret = PTR_ERR(adreno_gpu->memptrs_bo);
 		adreno_gpu->memptrs_bo = NULL;
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 4f79b10..6a1b0da 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -980,19 +980,16 @@ static int dsi_tx_buf_alloc(struct msm_dsi_host *msm_host, int size)
 	uint64_t iova;
 
 	if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) {
-		mutex_lock(&dev->struct_mutex);
 		msm_host->tx_gem_obj = msm_gem_new(dev, size, MSM_BO_UNCACHED);
 		if (IS_ERR(msm_host->tx_gem_obj)) {
 			ret = PTR_ERR(msm_host->tx_gem_obj);
 			pr_err("%s: failed to allocate gem, %d\n",
 				__func__, ret);
 			msm_host->tx_gem_obj = NULL;
-			mutex_unlock(&dev->struct_mutex);
 			return ret;
 		}
 
-		ret = msm_gem_get_iova_locked(msm_host->tx_gem_obj, 0, &iova);
-		mutex_unlock(&dev->struct_mutex);
+		ret = msm_gem_get_iova(msm_host->tx_gem_obj, 0, &iova);
 		if (ret) {
 			pr_err("%s: failed to get iova, %d\n", __func__, ret);
 			return ret;
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
index f29194a..15478f8 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c
@@ -372,7 +372,7 @@ 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_reference(next_bo);
-			msm_gem_get_iova_locked(next_bo, mdp4_kms->id, &iova);
+			msm_gem_get_iova(next_bo, mdp4_kms->id, &iova);
 
 			/* enable cursor: */
 			mdp4_write(mdp4_kms, REG_MDP4_DMA_CURSOR_SIZE(dma),
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
index 6295204..3a464b3 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
@@ -561,9 +561,7 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev)
 		goto fail;
 	}
 
-	mutex_lock(&dev->struct_mutex);
 	mdp4_kms->blank_cursor_bo = msm_gem_new(dev, SZ_16K, MSM_BO_WC);
-	mutex_unlock(&dev->struct_mutex);
 	if (IS_ERR(mdp4_kms->blank_cursor_bo)) {
 		ret = PTR_ERR(mdp4_kms->blank_cursor_bo);
 		dev_err(dev->dev, "could not allocate blank-cursor bo: %d\n", ret);
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 87b5695..bb1f3ee 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -349,6 +349,7 @@ static int msm_init_vram(struct drm_device *dev)
 		priv->vram.size = size;
 
 		drm_mm_init(&priv->vram.mm, 0, (size >> PAGE_SHIFT) - 1);
+		spin_lock_init(&priv->vram.lock);
 
 		attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
 		attrs |= DMA_ATTR_WRITE_COMBINE;
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 28b6f9b..567737d 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -157,6 +157,7 @@ struct msm_drm_private {
 		 * and position mm_node->start is in # of pages:
 		 */
 		struct drm_mm mm;
+		spinlock_t lock; /* Protects drm_mm node allocation/removal */
 	} vram;
 
 	struct notifier_block vmap_notifier;
@@ -209,8 +210,6 @@ int msm_gem_mmap_obj(struct drm_gem_object *obj,
 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 int msm_gem_fault(struct vm_fault *vmf);
 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
-int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
-		uint64_t *iova);
 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint64_t *iova);
 uint64_t msm_gem_iova(struct drm_gem_object *obj, int id);
 struct page **msm_gem_get_pages(struct drm_gem_object *obj);
@@ -228,9 +227,7 @@ struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
 		struct dma_buf_attachment *attach, struct sg_table *sg);
 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_locked(struct drm_gem_object *obj);
 void *msm_gem_get_vaddr(struct drm_gem_object *obj);
-void msm_gem_put_vaddr_locked(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);
 void msm_gem_purge(struct drm_gem_object *obj);
@@ -247,6 +244,8 @@ int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 		uint32_t size, uint32_t flags, uint32_t *handle);
 struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 		uint32_t size, uint32_t flags);
+struct drm_gem_object *msm_gem_new_locked(struct drm_device *dev,
+		uint32_t size, uint32_t flags);
 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 		struct dma_buf *dmabuf, struct sg_table *sgt);
 
diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
index 951e40f..785925e9 100644
--- a/drivers/gpu/drm/msm/msm_fbdev.c
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -95,10 +95,8 @@ static int msm_fbdev_create(struct drm_fb_helper *helper,
 	/* allocate backing bo */
 	size = mode_cmd.pitches[0] * mode_cmd.height;
 	DBG("allocating %d bytes for fb %d", size, dev->primary->index);
-	mutex_lock(&dev->struct_mutex);
 	fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
 			MSM_BO_WC | MSM_BO_STOLEN);
-	mutex_unlock(&dev->struct_mutex);
 	if (IS_ERR(fbdev->bo)) {
 		ret = PTR_ERR(fbdev->bo);
 		fbdev->bo = NULL;
@@ -124,7 +122,7 @@ 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_locked(fbdev->bo, 0, &paddr);
+	ret = msm_gem_get_iova(fbdev->bo, 0, &paddr);
 	if (ret) {
 		dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 		goto fail_unlock;
@@ -153,7 +151,7 @@ static int msm_fbdev_create(struct drm_fb_helper *helper,
 
 	dev->mode_config.fb_base = paddr;
 
-	fbi->screen_base = msm_gem_get_vaddr_locked(fbdev->bo);
+	fbi->screen_base = msm_gem_get_vaddr(fbdev->bo);
 	if (IS_ERR(fbi->screen_base)) {
 		ret = PTR_ERR(fbi->screen_base);
 		goto fail_unlock;
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 68e509b..1e803fb 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -41,8 +41,7 @@ static bool use_pages(struct drm_gem_object *obj)
 }
 
 /* allocate pages from VRAM carveout, used when no IOMMU: */
-static struct page **get_pages_vram(struct drm_gem_object *obj,
-		int npages)
+static struct page **get_pages_vram(struct drm_gem_object *obj, int npages)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	struct msm_drm_private *priv = obj->dev->dev_private;
@@ -54,7 +53,9 @@ static struct page **get_pages_vram(struct drm_gem_object *obj,
 	if (!p)
 		return ERR_PTR(-ENOMEM);
 
+	spin_lock(&priv->vram.lock);
 	ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node, npages);
+	spin_unlock(&priv->vram.lock);
 	if (ret) {
 		drm_free_large(p);
 		return ERR_PTR(ret);
@@ -69,7 +70,6 @@ static struct page **get_pages_vram(struct drm_gem_object *obj,
 	return p;
 }
 
-/* called with dev->struct_mutex held */
 static struct page **get_pages(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
@@ -109,6 +109,18 @@ static struct page **get_pages(struct drm_gem_object *obj)
 	return msm_obj->pages;
 }
 
+static void put_pages_vram(struct drm_gem_object *obj)
+{
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+	struct msm_drm_private *priv = obj->dev->dev_private;
+
+	spin_lock(&priv->vram.lock);
+	drm_mm_remove_node(msm_obj->vram_node);
+	spin_unlock(&priv->vram.lock);
+
+	drm_free_large(msm_obj->pages);
+}
+
 static void put_pages(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
@@ -125,10 +137,8 @@ static void put_pages(struct drm_gem_object *obj)
 
 		if (use_pages(obj))
 			drm_gem_put_pages(obj, msm_obj->pages, true, false);
-		else {
-			drm_mm_remove_node(msm_obj->vram_node);
-			drm_free_large(msm_obj->pages);
-		}
+		else
+			put_pages_vram(obj);
 
 		msm_obj->pages = NULL;
 	}
@@ -136,11 +146,12 @@ static void put_pages(struct drm_gem_object *obj)
 
 struct page **msm_gem_get_pages(struct drm_gem_object *obj)
 {
-	struct drm_device *dev = obj->dev;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	struct page **p;
-	mutex_lock(&dev->struct_mutex);
+
+	mutex_lock(&msm_obj->lock);
 	p = get_pages(obj);
-	mutex_unlock(&dev->struct_mutex);
+	mutex_unlock(&msm_obj->lock);
 	return p;
 }
 
@@ -195,25 +206,17 @@ int msm_gem_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct drm_gem_object *obj = vma->vm_private_data;
-	struct drm_device *dev = obj->dev;
-	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	struct page **pages;
 	unsigned long pfn;
 	pgoff_t pgoff;
 	int ret;
 
-	/* This should only happen if userspace tries to pass a mmap'd
-	 * but unfaulted gem bo vaddr into submit ioctl, triggering
-	 * a page fault while struct_mutex is already held.  This is
-	 * not a valid use-case so just bail.
+	/*
+	 * vm_ops.open/drm_gem_mmap_obj and close get and put
+	 * a reference on obj. So, we dont need to hold one here.
 	 */
-	if (priv->struct_mutex_task == current)
-		return VM_FAULT_SIGBUS;
-
-	/* Make sure we don't parallel update on a fault, nor move or remove
-	 * something from beneath our feet
-	 */
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	ret = mutex_lock_interruptible(&msm_obj->lock);
 	if (ret)
 		goto out;
 
@@ -235,7 +238,7 @@ int msm_gem_fault(struct vm_fault *vmf)
 	ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
 
 out_unlock:
-	mutex_unlock(&dev->struct_mutex);
+	mutex_unlock(&msm_obj->lock);
 out:
 	switch (ret) {
 	case -EAGAIN:
@@ -259,9 +262,10 @@ int msm_gem_fault(struct vm_fault *vmf)
 static uint64_t mmap_offset(struct drm_gem_object *obj)
 {
 	struct drm_device *dev = obj->dev;
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	int ret;
 
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+	WARN_ON(!mutex_is_locked(&msm_obj->lock));
 
 	/* Make it mmapable */
 	ret = drm_gem_create_mmap_offset(obj);
@@ -277,21 +281,23 @@ static uint64_t mmap_offset(struct drm_gem_object *obj)
 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
 {
 	uint64_t offset;
-	mutex_lock(&obj->dev->struct_mutex);
+	struct msm_gem_object *msm_obj = to_msm_bo(obj);
+
+	mutex_lock(&msm_obj->lock);
 	offset = mmap_offset(obj);
-	mutex_unlock(&obj->dev->struct_mutex);
+	mutex_unlock(&msm_obj->lock);
 	return offset;
 }
 
+/* Called with msm_obj->lock locked */
 static void
 put_iova(struct drm_gem_object *obj)
 {
-	struct drm_device *dev = obj->dev;
 	struct msm_drm_private *priv = obj->dev->dev_private;
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	int id;
 
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+	WARN_ON(!mutex_is_locked(&msm_obj->lock));
 
 	for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
 		if (!priv->aspace[id])
@@ -301,25 +307,23 @@ uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
 	}
 }
 
-/* should be called under struct_mutex.. although it can be called
- * from atomic context without struct_mutex to acquire an extra
- * iova ref if you know one is already held.
- *
- * That means when I do eventually need to add support for unpinning
- * the refcnt counter needs to be atomic_t.
- */
-int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
+/* A reference to obj must be held before calling this function. */
+int msm_gem_get_iova(struct drm_gem_object *obj, int id,
 		uint64_t *iova)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	int ret = 0;
 
+	mutex_lock(&msm_obj->lock);
+
 	if (!msm_obj->domain[id].iova) {
 		struct msm_drm_private *priv = obj->dev->dev_private;
 		struct page **pages = get_pages(obj);
 
-		if (IS_ERR(pages))
+		if (IS_ERR(pages)) {
+			mutex_unlock(&msm_obj->lock);
 			return PTR_ERR(pages);
+		}
 
 		if (iommu_present(&platform_bus_type)) {
 			ret = msm_gem_map_vma(priv->aspace[id], &msm_obj->domain[id],
@@ -332,26 +336,7 @@ int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
 	if (!ret)
 		*iova = msm_obj->domain[id].iova;
 
-	return ret;
-}
-
-/* get iova, taking a reference.  Should have a matching put */
-int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint64_t *iova)
-{
-	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	int ret;
-
-	/* this is safe right now because we don't unmap until the
-	 * bo is deleted:
-	 */
-	if (msm_obj->domain[id].iova) {
-		*iova = msm_obj->domain[id].iova;
-		return 0;
-	}
-
-	mutex_lock(&obj->dev->struct_mutex);
-	ret = msm_gem_get_iova_locked(obj, id, iova);
-	mutex_unlock(&obj->dev->struct_mutex);
+	mutex_unlock(&msm_obj->lock);
 	return ret;
 }
 
@@ -405,45 +390,37 @@ int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
 	return ret;
 }
 
-void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj)
+void *msm_gem_get_vaddr(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
+	mutex_lock(&msm_obj->lock);
 	if (!msm_obj->vaddr) {
 		struct page **pages = get_pages(obj);
-		if (IS_ERR(pages))
+		if (IS_ERR(pages)) {
+			mutex_unlock(&msm_obj->lock);
 			return ERR_CAST(pages);
+		}
 		msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
 				VM_MAP, pgprot_writecombine(PAGE_KERNEL));
-		if (msm_obj->vaddr == NULL)
+		if (msm_obj->vaddr == NULL) {
+			mutex_unlock(&msm_obj->lock);
 			return ERR_PTR(-ENOMEM);
+		}
 	}
 	msm_obj->vmap_count++;
+	mutex_unlock(&msm_obj->lock);
 	return msm_obj->vaddr;
 }
 
-void *msm_gem_get_vaddr(struct drm_gem_object *obj)
-{
-	void *ret;
-	mutex_lock(&obj->dev->struct_mutex);
-	ret = msm_gem_get_vaddr_locked(obj);
-	mutex_unlock(&obj->dev->struct_mutex);
-	return ret;
-}
-
-void msm_gem_put_vaddr_locked(struct drm_gem_object *obj)
+void msm_gem_put_vaddr(struct drm_gem_object *obj)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
-	WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
+
+	mutex_lock(&msm_obj->lock);
 	WARN_ON(msm_obj->vmap_count < 1);
 	msm_obj->vmap_count--;
-}
-
-void msm_gem_put_vaddr(struct drm_gem_object *obj)
-{
-	mutex_lock(&obj->dev->struct_mutex);
-	msm_gem_put_vaddr_locked(obj);
-	mutex_unlock(&obj->dev->struct_mutex);
+	mutex_unlock(&msm_obj->lock);
 }
 
 /* Update madvise status, returns true if not purged, else
@@ -697,6 +674,8 @@ void msm_gem_free_object(struct drm_gem_object *obj)
 
 	list_del(&msm_obj->mm_list);
 
+	mutex_lock(&msm_obj->lock);
+
 	put_iova(obj);
 
 	if (obj->import_attach) {
@@ -720,6 +699,7 @@ void msm_gem_free_object(struct drm_gem_object *obj)
 
 	drm_gem_object_release(obj);
 
+	mutex_unlock(&msm_obj->lock);
 	kfree(msm_obj);
 }
 
@@ -730,14 +710,8 @@ int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 	struct drm_gem_object *obj;
 	int ret;
 
-	ret = mutex_lock_interruptible(&dev->struct_mutex);
-	if (ret)
-		return ret;
-
 	obj = msm_gem_new(dev, size, flags);
 
-	mutex_unlock(&dev->struct_mutex);
-
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
 
@@ -752,7 +726,8 @@ int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 static int msm_gem_new_impl(struct drm_device *dev,
 		uint32_t size, uint32_t flags,
 		struct reservation_object *resv,
-		struct drm_gem_object **obj)
+		struct drm_gem_object **obj,
+		bool struct_mutex_locked)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_gem_object *msm_obj;
@@ -781,6 +756,8 @@ static int msm_gem_new_impl(struct drm_device *dev,
 	if (!msm_obj)
 		return -ENOMEM;
 
+	mutex_init(&msm_obj->lock);
+
 	if (use_vram)
 		msm_obj->vram_node = &msm_obj->domain[0].node;
 
@@ -795,21 +772,25 @@ static int msm_gem_new_impl(struct drm_device *dev,
 	}
 
 	INIT_LIST_HEAD(&msm_obj->submit_entry);
-	list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
+	if (struct_mutex_locked) {
+		list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
+	} else {
+		mutex_lock(&dev->struct_mutex);
+		list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
+		mutex_unlock(&dev->struct_mutex);
+	}
 
 	*obj = &msm_obj->base;
 
 	return 0;
 }
 
-struct drm_gem_object *msm_gem_new(struct drm_device *dev,
-		uint32_t size, uint32_t flags)
+static struct drm_gem_object *_msm_gem_new(struct drm_device *dev,
+		uint32_t size, uint32_t flags, bool struct_mutex_locked)
 {
 	struct drm_gem_object *obj = NULL;
 	int ret;
 
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
-
 	size = PAGE_ALIGN(size);
 
 	/* Disallow zero sized objects as they make the underlying
@@ -818,7 +799,7 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 	if (size == 0)
 		return ERR_PTR(-EINVAL);
 
-	ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
+	ret = msm_gem_new_impl(dev, size, flags, NULL, &obj, struct_mutex_locked);
 	if (ret)
 		goto fail;
 
@@ -833,10 +814,22 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 	return obj;
 
 fail:
-	drm_gem_object_unreference(obj);
+	drm_gem_object_unreference_unlocked(obj);
 	return ERR_PTR(ret);
 }
 
+struct drm_gem_object *msm_gem_new_locked(struct drm_device *dev,
+		uint32_t size, uint32_t flags)
+{
+	return _msm_gem_new(dev, size, flags, true);
+}
+
+struct drm_gem_object *msm_gem_new(struct drm_device *dev,
+		uint32_t size, uint32_t flags)
+{
+	return _msm_gem_new(dev, size, flags, false);
+}
+
 struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 		struct dma_buf *dmabuf, struct sg_table *sgt)
 {
@@ -853,7 +846,7 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 
 	size = PAGE_ALIGN(dmabuf->size);
 
-	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj);
+	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj, false);
 	if (ret)
 		goto fail;
 
@@ -862,17 +855,22 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 	npages = size / PAGE_SIZE;
 
 	msm_obj = to_msm_bo(obj);
+	mutex_lock(&msm_obj->lock);
 	msm_obj->sgt = sgt;
 	msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
 	if (!msm_obj->pages) {
+		mutex_unlock(&msm_obj->lock);
 		ret = -ENOMEM;
 		goto fail;
 	}
 
 	ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
-	if (ret)
+	if (ret) {
+		mutex_unlock(&msm_obj->lock);
 		goto fail;
+	}
 
+	mutex_unlock(&msm_obj->lock);
 	return obj;
 
 fail:
diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
index 1b4cf20..b1bfc10 100644
--- a/drivers/gpu/drm/msm/msm_gem.h
+++ b/drivers/gpu/drm/msm/msm_gem.h
@@ -31,6 +31,7 @@ struct msm_gem_address_space {
 	 * and position mm_node->start is in # of pages:
 	 */
 	struct drm_mm mm;
+	spinlock_t lock; /* Protects drm_mm node allocation/removal */
 	struct msm_mmu *mmu;
 	struct kref kref;
 };
@@ -87,6 +88,7 @@ struct msm_gem_object {
 	 * an IOMMU.  Also used for stolen/splashscreen buffer.
 	 */
 	struct drm_mm_node *vram_node;
+	struct mutex lock; /* Protects resources associated with bo */
 };
 #define to_msm_bo(x) container_of(x, struct msm_gem_object, base)
 
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 1c545eb..8420551 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -245,7 +245,7 @@ static int submit_pin_objects(struct msm_gem_submit *submit)
 		uint64_t iova;
 
 		/* if locking succeeded, pin bo: */
-		ret = msm_gem_get_iova_locked(&msm_obj->base,
+		ret = msm_gem_get_iova(&msm_obj->base,
 				submit->gpu->id, &iova);
 
 		if (ret)
@@ -301,7 +301,7 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
 	/* For now, just map the entire thing.  Eventually we probably
 	 * to do it page-by-page, w/ kmap() if not vmap()d..
 	 */
-	ptr = msm_gem_get_vaddr_locked(&obj->base);
+	ptr = msm_gem_get_vaddr(&obj->base);
 
 	if (IS_ERR(ptr)) {
 		ret = PTR_ERR(ptr);
@@ -359,7 +359,7 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
 	}
 
 out:
-	msm_gem_put_vaddr_locked(&obj->base);
+	msm_gem_put_vaddr(&obj->base);
 
 	return ret;
 }
diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
index f285d7e..c36321bc 100644
--- a/drivers/gpu/drm/msm/msm_gem_vma.c
+++ b/drivers/gpu/drm/msm/msm_gem_vma.c
@@ -50,7 +50,9 @@ void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
 		aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size);
 	}
 
+	spin_lock(&aspace->lock);
 	drm_mm_remove_node(&vma->node);
+	spin_unlock(&aspace->lock);
 
 	vma->iova = 0;
 
@@ -63,10 +65,15 @@ void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
 {
 	int ret;
 
-	if (WARN_ON(drm_mm_node_allocated(&vma->node)))
+	spin_lock(&aspace->lock);
+	if (WARN_ON(drm_mm_node_allocated(&vma->node))) {
+		spin_unlock(&aspace->lock);
 		return 0;
+	}
 
 	ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages);
+	spin_unlock(&aspace->lock);
+
 	if (ret)
 		return ret;
 
@@ -94,6 +101,7 @@ struct msm_gem_address_space *
 	if (!aspace)
 		return ERR_PTR(-ENOMEM);
 
+	spin_lock_init(&aspace->lock);
 	aspace->name = name;
 	aspace->mmu = msm_iommu_new(dev, domain);
 
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 97b9c38..d6e5cb2 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -495,7 +495,7 @@ 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_reference(&msm_obj->base);
-		msm_gem_get_iova_locked(&msm_obj->base,
+		msm_gem_get_iova(&msm_obj->base,
 				submit->gpu->id, &iova);
 
 		if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
@@ -662,9 +662,7 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 
 
 	/* Create ringbuffer: */
-	mutex_lock(&drm->struct_mutex);
 	gpu->rb = msm_ringbuffer_new(gpu, ringsz);
-	mutex_unlock(&drm->struct_mutex);
 	if (IS_ERR(gpu->rb)) {
 		ret = PTR_ERR(gpu->rb);
 		gpu->rb = NULL;
diff --git a/drivers/gpu/drm/msm/msm_rd.c b/drivers/gpu/drm/msm/msm_rd.c
index 0e81faa..0366b80 100644
--- a/drivers/gpu/drm/msm/msm_rd.c
+++ b/drivers/gpu/drm/msm/msm_rd.c
@@ -268,7 +268,7 @@ static void snapshot_buf(struct msm_rd_state *rd,
 	struct msm_gem_object *obj = submit->bos[idx].obj;
 	const char *buf;
 
-	buf = msm_gem_get_vaddr_locked(&obj->base);
+	buf = msm_gem_get_vaddr(&obj->base);
 	if (IS_ERR(buf))
 		return;
 
@@ -283,7 +283,7 @@ static void snapshot_buf(struct msm_rd_state *rd,
 			(uint32_t[3]){ iova, size, iova >> 32 }, 12);
 	rd_write_section(rd, RD_BUFFER_CONTENTS, buf, size);
 
-	msm_gem_put_vaddr_locked(&obj->base);
+	msm_gem_put_vaddr(&obj->base);
 }
 
 /* called under struct_mutex */
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
index 67b34e0..791bca3 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.c
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -40,7 +40,7 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
 		goto fail;
 	}
 
-	ring->start = msm_gem_get_vaddr_locked(ring->bo);
+	ring->start = msm_gem_get_vaddr(ring->bo);
 	if (IS_ERR(ring->start)) {
 		ret = PTR_ERR(ring->start);
 		goto fail;
-- 
1.9.1

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