drm/msm: prime support

Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: David Brown <davidb@codeaurora.org>

1 files changed, 97 insertions, 23 deletions

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 2bae46c66a30..ea2c96f9459b 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -17,6 +17,7 @@
 
 #include <linux/spinlock.h>
 #include <linux/shmem_fs.h>
+#include <linux/dma-buf.h>
 
 #include "msm_drv.h"
 #include "msm_gem.h"
@@ -77,6 +78,21 @@ 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 page **p;
+	mutex_lock(&dev->struct_mutex);
+	p = get_pages(obj);
+	mutex_unlock(&dev->struct_mutex);
+	return p;
+}
+
+void msm_gem_put_pages(struct drm_gem_object *obj)
+{
+	/* when we start tracking the pin count, then do something here */
+}
+
 int msm_gem_mmap_obj(struct drm_gem_object *obj,
 		struct vm_area_struct *vma)
 {
@@ -510,10 +526,21 @@ void msm_gem_free_object(struct drm_gem_object *obj)
 
 	drm_gem_free_mmap_offset(obj);
 
-	if (msm_obj->vaddr)
-		vunmap(msm_obj->vaddr);
+	if (obj->import_attach) {
+		if (msm_obj->vaddr)
+			dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
+
+		/* Don't drop the pages for imported dmabuf, as they are not
+		 * ours, just free the array we allocated:
+		 */
+		if (msm_obj->pages)
+			drm_free_large(msm_obj->pages);
 
-	put_pages(obj);
+	} else {
+		if (msm_obj->vaddr)
+			vunmap(msm_obj->vaddr);
+		put_pages(obj);
+	}
 
 	if (msm_obj->resv == &msm_obj->_resv)
 		reservation_object_fini(msm_obj->resv);
@@ -549,17 +576,12 @@ int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
 	return ret;
 }
 
-struct drm_gem_object *msm_gem_new(struct drm_device *dev,
-		uint32_t size, uint32_t flags)
+static int msm_gem_new_impl(struct drm_device *dev,
+		uint32_t size, uint32_t flags,
+		struct drm_gem_object **obj)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct msm_gem_object *msm_obj;
-	struct drm_gem_object *obj = NULL;
-	int ret;
-
-	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
-
-	size = PAGE_ALIGN(size);
 
 	switch (flags & MSM_BO_CACHE_MASK) {
 	case MSM_BO_UNCACHED:
@@ -569,21 +591,12 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 	default:
 		dev_err(dev->dev, "invalid cache flag: %x\n",
 				(flags & MSM_BO_CACHE_MASK));
-		ret = -EINVAL;
-		goto fail;
+		return -EINVAL;
 	}
 
 	msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL);
-	if (!msm_obj) {
-		ret = -ENOMEM;
-		goto fail;
-	}
-
-	obj = &msm_obj->base;
-
-	ret = drm_gem_object_init(dev, obj, size);
-	if (ret)
-		goto fail;
+	if (!msm_obj)
+		return -ENOMEM;
 
 	msm_obj->flags = flags;
 
@@ -594,6 +607,67 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
 	INIT_LIST_HEAD(&msm_obj->inactive_work);
 	list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
 
+	*obj = &msm_obj->base;
+
+	return 0;
+}
+
+struct drm_gem_object *msm_gem_new(struct drm_device *dev,
+		uint32_t size, uint32_t flags)
+{
+	struct drm_gem_object *obj;
+	int ret;
+
+	WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
+	size = PAGE_ALIGN(size);
+
+	ret = msm_gem_new_impl(dev, size, flags, &obj);
+	if (ret)
+		goto fail;
+
+	ret = drm_gem_object_init(dev, obj, size);
+	if (ret)
+		goto fail;
+
+	return obj;
+
+fail:
+	if (obj)
+		drm_gem_object_unreference_unlocked(obj);
+
+	return ERR_PTR(ret);
+}
+
+struct drm_gem_object *msm_gem_import(struct drm_device *dev,
+		uint32_t size, struct sg_table *sgt)
+{
+	struct msm_gem_object *msm_obj;
+	struct drm_gem_object *obj;
+	int ret, npages;
+
+	size = PAGE_ALIGN(size);
+
+	ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
+	if (ret)
+		goto fail;
+
+	drm_gem_private_object_init(dev, obj, size);
+
+	npages = size / PAGE_SIZE;
+
+	msm_obj = to_msm_bo(obj);
+	msm_obj->sgt = sgt;
+	msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
+	if (!msm_obj->pages) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
+	if (ret)
+		goto fail;
+
 	return obj;
 
 fail: