1 files changed, 223 insertions, 234 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index d2545560664..47318077652 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -3,24 +3,10 @@
  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
  * Author: Inki Dae <inki.dae@samsung.com>
  *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
  */
 
 #include <drm/drmP.h>
@@ -83,157 +69,40 @@ static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
 
 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
 {
-	if (!IS_NONCONTIG_BUFFER(flags)) {
-		if (size >= SZ_1M)
-			return roundup(size, SECTION_SIZE);
-		else if (size >= SZ_64K)
-			return roundup(size, SZ_64K);
-		else
-			goto out;
-	}
-out:
-	return roundup(size, PAGE_SIZE);
-}
-
-struct page **exynos_gem_get_pages(struct drm_gem_object *obj,
-						gfp_t gfpmask)
-{
-	struct page *p, **pages;
-	int i, npages;
-
-	npages = obj->size >> PAGE_SHIFT;
-
-	pages = drm_malloc_ab(npages, sizeof(struct page *));
-	if (pages == NULL)
-		return ERR_PTR(-ENOMEM);
-
-	for (i = 0; i < npages; i++) {
-		p = alloc_page(gfpmask);
-		if (IS_ERR(p))
-			goto fail;
-		pages[i] = p;
-	}
-
-	return pages;
-
-fail:
-	while (--i)
-		__free_page(pages[i]);
-
-	drm_free_large(pages);
-	return ERR_CAST(p);
-}
-
-static void exynos_gem_put_pages(struct drm_gem_object *obj,
-					struct page **pages)
-{
-	int npages;
+	/* TODO */
 
-	npages = obj->size >> PAGE_SHIFT;
-
-	while (--npages >= 0)
-		__free_page(pages[npages]);
-
-	drm_free_large(pages);
+	return roundup(size, PAGE_SIZE);
 }
 
-static int exynos_drm_gem_map_pages(struct drm_gem_object *obj,
+static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
 					struct vm_area_struct *vma,
 					unsigned long f_vaddr,
 					pgoff_t page_offset)
 {
 	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
 	struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
+	struct scatterlist *sgl;
 	unsigned long pfn;
+	int i;
 
-	if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
-		if (!buf->pages)
-			return -EINTR;
-
-		pfn = page_to_pfn(buf->pages[page_offset++]);
-	} else
-		pfn = (buf->dma_addr >> PAGE_SHIFT) + page_offset;
-
-	return vm_insert_mixed(vma, f_vaddr, pfn);
-}
-
-static int exynos_drm_gem_get_pages(struct drm_gem_object *obj)
-{
-	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
-	struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
-	struct scatterlist *sgl;
-	struct page **pages;
-	unsigned int npages, i = 0;
-	int ret;
+	if (!buf->sgt)
+		return -EINTR;
 
-	if (buf->pages) {
-		DRM_DEBUG_KMS("already allocated.\n");
+	if (page_offset >= (buf->size >> PAGE_SHIFT)) {
+		DRM_ERROR("invalid page offset\n");
 		return -EINVAL;
 	}
 
-	pages = exynos_gem_get_pages(obj, GFP_HIGHUSER_MOVABLE);
-	if (IS_ERR(pages)) {
-		DRM_ERROR("failed to get pages.\n");
-		return PTR_ERR(pages);
-	}
-
-	npages = obj->size >> PAGE_SHIFT;
-	buf->page_size = PAGE_SIZE;
-
-	buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
-	if (!buf->sgt) {
-		DRM_ERROR("failed to allocate sg table.\n");
-		ret = -ENOMEM;
-		goto err;
-	}
-
-	ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
-	if (ret < 0) {
-		DRM_ERROR("failed to initialize sg table.\n");
-		ret = -EFAULT;
-		goto err1;
-	}
-
 	sgl = buf->sgt->sgl;
-
-	/* set all pages to sg list. */
-	while (i < npages) {
-		sg_set_page(sgl, pages[i], PAGE_SIZE, 0);
-		sg_dma_address(sgl) = page_to_phys(pages[i]);
-		i++;
-		sgl = sg_next(sgl);
+	for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
+		if (page_offset < (sgl->length >> PAGE_SHIFT))
+			break;
+		page_offset -=	(sgl->length >> PAGE_SHIFT);
 	}
 
-	/* add some codes for UNCACHED type here. TODO */
-
-	buf->pages = pages;
-	return ret;
-err1:
-	kfree(buf->sgt);
-	buf->sgt = NULL;
-err:
-	exynos_gem_put_pages(obj, pages);
-	return ret;
-
-}
-
-static void exynos_drm_gem_put_pages(struct drm_gem_object *obj)
-{
-	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
-	struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
-
-	/*
-	 * if buffer typs is EXYNOS_BO_NONCONTIG then release all pages
-	 * allocated at gem fault handler.
-	 */
-	sg_free_table(buf->sgt);
-	kfree(buf->sgt);
-	buf->sgt = NULL;
-
-	exynos_gem_put_pages(obj, buf->pages);
-	buf->pages = NULL;
+	pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
 
-	/* add some codes for UNCACHED type here. TODO */
+	return vm_insert_mixed(vma, f_vaddr, pfn);
 }
 
 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
@@ -270,9 +139,6 @@ void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
 
 	DRM_DEBUG_KMS("handle count = %d\n", atomic_read(&obj->handle_count));
 
-	if (!buf->pages)
-		return;
-
 	/*
 	 * do not release memory region from exporter.
 	 *
@@ -282,10 +148,7 @@ void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
 	if (obj->import_attach)
 		goto out;
 
-	if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG)
-		exynos_drm_gem_put_pages(obj);
-	else
-		exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
+	exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
 
 out:
 	exynos_drm_fini_buf(obj->dev, buf);
@@ -364,22 +227,10 @@ struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 	/* set memory type and cache attribute from user side. */
 	exynos_gem_obj->flags = flags;
 
-	/*
-	 * allocate all pages as desired size if user wants to allocate
-	 * physically non-continuous memory.
-	 */
-	if (flags & EXYNOS_BO_NONCONTIG) {
-		ret = exynos_drm_gem_get_pages(&exynos_gem_obj->base);
-		if (ret < 0) {
-			drm_gem_object_release(&exynos_gem_obj->base);
-			goto err_fini_buf;
-		}
-	} else {
-		ret = exynos_drm_alloc_buf(dev, buf, flags);
-		if (ret < 0) {
-			drm_gem_object_release(&exynos_gem_obj->base);
-			goto err_fini_buf;
-		}
+	ret = exynos_drm_alloc_buf(dev, buf, flags);
+	if (ret < 0) {
+		drm_gem_object_release(&exynos_gem_obj->base);
+		goto err_fini_buf;
 	}
 
 	return exynos_gem_obj;
@@ -412,14 +263,14 @@ int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
-void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
+dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 					unsigned int gem_handle,
-					struct drm_file *file_priv)
+					struct drm_file *filp)
 {
 	struct exynos_drm_gem_obj *exynos_gem_obj;
 	struct drm_gem_object *obj;
 
-	obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
+	obj = drm_gem_object_lookup(dev, filp, gem_handle);
 	if (!obj) {
 		DRM_ERROR("failed to lookup gem object.\n");
 		return ERR_PTR(-EINVAL);
@@ -427,25 +278,17 @@ void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 
 	exynos_gem_obj = to_exynos_gem_obj(obj);
 
-	if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
-		DRM_DEBUG_KMS("not support NONCONTIG type.\n");
-		drm_gem_object_unreference_unlocked(obj);
-
-		/* TODO */
-		return ERR_PTR(-EINVAL);
-	}
-
 	return &exynos_gem_obj->buffer->dma_addr;
 }
 
 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 					unsigned int gem_handle,
-					struct drm_file *file_priv)
+					struct drm_file *filp)
 {
 	struct exynos_drm_gem_obj *exynos_gem_obj;
 	struct drm_gem_object *obj;
 
-	obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
+	obj = drm_gem_object_lookup(dev, filp, gem_handle);
 	if (!obj) {
 		DRM_ERROR("failed to lookup gem object.\n");
 		return;
@@ -453,14 +296,6 @@ void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 
 	exynos_gem_obj = to_exynos_gem_obj(obj);
 
-	if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
-		DRM_DEBUG_KMS("not support NONCONTIG type.\n");
-		drm_gem_object_unreference_unlocked(obj);
-
-		/* TODO */
-		return;
-	}
-
 	drm_gem_object_unreference_unlocked(obj);
 
 	/*
@@ -489,22 +324,57 @@ int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
 			&args->offset);
 }
 
+static struct drm_file *exynos_drm_find_drm_file(struct drm_device *drm_dev,
+							struct file *filp)
+{
+	struct drm_file *file_priv;
+
+	mutex_lock(&drm_dev->struct_mutex);
+
+	/* find current process's drm_file from filelist. */
+	list_for_each_entry(file_priv, &drm_dev->filelist, lhead) {
+		if (file_priv->filp == filp) {
+			mutex_unlock(&drm_dev->struct_mutex);
+			return file_priv;
+		}
+	}
+
+	mutex_unlock(&drm_dev->struct_mutex);
+	WARN_ON(1);
+
+	return ERR_PTR(-EFAULT);
+}
+
 static int exynos_drm_gem_mmap_buffer(struct file *filp,
 				      struct vm_area_struct *vma)
 {
 	struct drm_gem_object *obj = filp->private_data;
 	struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
+	struct drm_device *drm_dev = obj->dev;
 	struct exynos_drm_gem_buf *buffer;
-	unsigned long pfn, vm_size, usize, uaddr = vma->vm_start;
+	struct drm_file *file_priv;
+	unsigned long vm_size;
 	int ret;
 
 	DRM_DEBUG_KMS("%s\n", __FILE__);
 
 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
+	vma->vm_private_data = obj;
+	vma->vm_ops = drm_dev->driver->gem_vm_ops;
+
+	/* restore it to driver's fops. */
+	filp->f_op = fops_get(drm_dev->driver->fops);
+
+	file_priv = exynos_drm_find_drm_file(drm_dev, filp);
+	if (IS_ERR(file_priv))
+		return PTR_ERR(file_priv);
+
+	/* restore it to drm_file. */
+	filp->private_data = file_priv;
 
 	update_vm_cache_attr(exynos_gem_obj, vma);
 
-	vm_size = usize = vma->vm_end - vma->vm_start;
+	vm_size = vma->vm_end - vma->vm_start;
 
 	/*
 	 * a buffer contains information to physically continuous memory
@@ -516,40 +386,23 @@ static int exynos_drm_gem_mmap_buffer(struct file *filp,
 	if (vm_size > buffer->size)
 		return -EINVAL;
 
-	if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
-		int i = 0;
-
-		if (!buffer->pages)
-			return -EINVAL;
-
-		vma->vm_flags |= VM_MIXEDMAP;
-
-		do {
-			ret = vm_insert_page(vma, uaddr, buffer->pages[i++]);
-			if (ret) {
-				DRM_ERROR("failed to remap user space.\n");
-				return ret;
-			}
-
-			uaddr += PAGE_SIZE;
-			usize -= PAGE_SIZE;
-		} while (usize > 0);
-	} else {
-		/*
-		 * get page frame number to physical memory to be mapped
-		 * to user space.
-		 */
-		pfn = ((unsigned long)exynos_gem_obj->buffer->dma_addr) >>
-								PAGE_SHIFT;
+	ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
+				buffer->dma_addr, buffer->size,
+				&buffer->dma_attrs);
+	if (ret < 0) {
+		DRM_ERROR("failed to mmap.\n");
+		return ret;
+	}
 
-		DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
+	/*
+	 * take a reference to this mapping of the object. And this reference
+	 * is unreferenced by the corresponding vm_close call.
+	 */
+	drm_gem_object_reference(obj);
 
-		if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
-					vma->vm_page_prot)) {
-			DRM_ERROR("failed to remap pfn range.\n");
-			return -EAGAIN;
-		}
-	}
+	mutex_lock(&drm_dev->struct_mutex);
+	drm_vm_open_locked(drm_dev, vma);
+	mutex_unlock(&drm_dev->struct_mutex);
 
 	return 0;
 }
@@ -578,16 +431,29 @@ int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
 		return -EINVAL;
 	}
 
-	obj->filp->f_op = &exynos_drm_gem_fops;
-	obj->filp->private_data = obj;
+	/*
+	 * Set specific mmper's fops. And it will be restored by
+	 * exynos_drm_gem_mmap_buffer to dev->driver->fops.
+	 * This is used to call specific mapper temporarily.
+	 */
+	file_priv->filp->f_op = &exynos_drm_gem_fops;
+
+	/*
+	 * Set gem object to private_data so that specific mmaper
+	 * can get the gem object. And it will be restored by
+	 * exynos_drm_gem_mmap_buffer to drm_file.
+	 */
+	file_priv->filp->private_data = obj;
 
-	addr = vm_mmap(obj->filp, 0, args->size,
+	addr = vm_mmap(file_priv->filp, 0, args->size,
 			PROT_READ | PROT_WRITE, MAP_SHARED, 0);
 
 	drm_gem_object_unreference_unlocked(obj);
 
-	if (IS_ERR((void *)addr))
+	if (IS_ERR((void *)addr)) {
+		file_priv->filp->private_data = file_priv;
 		return PTR_ERR((void *)addr);
+	}
 
 	args->mapped = addr;
 
@@ -622,6 +488,129 @@ int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
+struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
+{
+	struct vm_area_struct *vma_copy;
+
+	vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
+	if (!vma_copy)
+		return NULL;
+
+	if (vma->vm_ops && vma->vm_ops->open)
+		vma->vm_ops->open(vma);
+
+	if (vma->vm_file)
+		get_file(vma->vm_file);
+
+	memcpy(vma_copy, vma, sizeof(*vma));
+
+	vma_copy->vm_mm = NULL;
+	vma_copy->vm_next = NULL;
+	vma_copy->vm_prev = NULL;
+
+	return vma_copy;
+}
+
+void exynos_gem_put_vma(struct vm_area_struct *vma)
+{
+	if (!vma)
+		return;
+
+	if (vma->vm_ops && vma->vm_ops->close)
+		vma->vm_ops->close(vma);
+
+	if (vma->vm_file)
+		fput(vma->vm_file);
+
+	kfree(vma);
+}
+
+int exynos_gem_get_pages_from_userptr(unsigned long start,
+						unsigned int npages,
+						struct page **pages,
+						struct vm_area_struct *vma)
+{
+	int get_npages;
+
+	/* the memory region mmaped with VM_PFNMAP. */
+	if (vma_is_io(vma)) {
+		unsigned int i;
+
+		for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
+			unsigned long pfn;
+			int ret = follow_pfn(vma, start, &pfn);
+			if (ret)
+				return ret;
+
+			pages[i] = pfn_to_page(pfn);
+		}
+
+		if (i != npages) {
+			DRM_ERROR("failed to get user_pages.\n");
+			return -EINVAL;
+		}
+
+		return 0;
+	}
+
+	get_npages = get_user_pages(current, current->mm, start,
+					npages, 1, 1, pages, NULL);
+	get_npages = max(get_npages, 0);
+	if (get_npages != npages) {
+		DRM_ERROR("failed to get user_pages.\n");
+		while (get_npages)
+			put_page(pages[--get_npages]);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+void exynos_gem_put_pages_to_userptr(struct page **pages,
+					unsigned int npages,
+					struct vm_area_struct *vma)
+{
+	if (!vma_is_io(vma)) {
+		unsigned int i;
+
+		for (i = 0; i < npages; i++) {
+			set_page_dirty_lock(pages[i]);
+
+			/*
+			 * undo the reference we took when populating
+			 * the table.
+			 */
+			put_page(pages[i]);
+		}
+	}
+}
+
+int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
+				struct sg_table *sgt,
+				enum dma_data_direction dir)
+{
+	int nents;
+
+	mutex_lock(&drm_dev->struct_mutex);
+
+	nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
+	if (!nents) {
+		DRM_ERROR("failed to map sgl with dma.\n");
+		mutex_unlock(&drm_dev->struct_mutex);
+		return nents;
+	}
+
+	mutex_unlock(&drm_dev->struct_mutex);
+	return 0;
+}
+
+void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
+				struct sg_table *sgt,
+				enum dma_data_direction dir)
+{
+	dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
+}
+
 int exynos_drm_gem_init_object(struct drm_gem_object *obj)
 {
 	DRM_DEBUG_KMS("%s\n", __FILE__);
@@ -753,9 +742,9 @@ int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 
 	mutex_lock(&dev->struct_mutex);
 
-	ret = exynos_drm_gem_map_pages(obj, vma, f_vaddr, page_offset);
+	ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
 	if (ret < 0)
-		DRM_ERROR("failed to map pages.\n");
+		DRM_ERROR("failed to map a buffer with user.\n");
 
 	mutex_unlock(&dev->struct_mutex);