1 files changed, 287 insertions, 79 deletions

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index ce023fa..da32086 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -14,6 +14,7 @@
  */
 
 #include <linux/dma-buf.h>
+#include <linux/iommu.h>
 #include <drm/tegra_drm.h>
 
 #include "drm.h"
@@ -91,13 +92,90 @@ static const struct host1x_bo_ops tegra_bo_ops = {
 	.kunmap = tegra_bo_kunmap,
 };
 
-static void tegra_bo_destroy(struct drm_device *drm, struct tegra_bo *bo)
+/*
+ * A generic iommu_map_sg() function is being reviewed and will hopefully be
+ * merged soon. At that point this function can be dropped in favour of the
+ * one provided by the IOMMU API.
+ */
+static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
+			      struct scatterlist *sg, unsigned int nents,
+			      int prot)
 {
-	dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
+	struct scatterlist *s;
+	size_t offset = 0;
+	unsigned int i;
+	int err;
+
+	for_each_sg(sg, s, nents, i) {
+		phys_addr_t phys = page_to_phys(sg_page(s));
+		size_t length = s->offset + s->length;
+
+		err = iommu_map(domain, iova + offset, phys, length, prot);
+		if (err < 0) {
+			iommu_unmap(domain, iova, offset);
+			return err;
+		}
+
+		offset += length;
+	}
+
+	return offset;
 }
 
-struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
-				 unsigned long flags)
+static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
+{
+	int prot = IOMMU_READ | IOMMU_WRITE;
+	ssize_t err;
+
+	if (bo->mm)
+		return -EBUSY;
+
+	bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
+	if (!bo->mm)
+		return -ENOMEM;
+
+	err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
+					 PAGE_SIZE, 0, 0, 0);
+	if (err < 0) {
+		dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
+			err);
+		goto free;
+	}
+
+	bo->paddr = bo->mm->start;
+
+	err = __iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
+			     bo->sgt->nents, prot);
+	if (err < 0) {
+		dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
+		goto remove;
+	}
+
+	bo->size = err;
+
+	return 0;
+
+remove:
+	drm_mm_remove_node(bo->mm);
+free:
+	kfree(bo->mm);
+	return err;
+}
+
+static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
+{
+	if (!bo->mm)
+		return 0;
+
+	iommu_unmap(tegra->domain, bo->paddr, bo->size);
+	drm_mm_remove_node(bo->mm);
+	kfree(bo->mm);
+
+	return 0;
+}
+
+static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
+					      size_t size)
 {
 	struct tegra_bo *bo;
 	int err;
@@ -109,22 +187,96 @@ struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
 	host1x_bo_init(&bo->base, &tegra_bo_ops);
 	size = round_up(size, PAGE_SIZE);
 
-	bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
-					   GFP_KERNEL | __GFP_NOWARN);
-	if (!bo->vaddr) {
-		dev_err(drm->dev, "failed to allocate buffer with size %u\n",
-			size);
-		err = -ENOMEM;
-		goto err_dma;
-	}
-
 	err = drm_gem_object_init(drm, &bo->gem, size);
-	if (err)
-		goto err_init;
+	if (err < 0)
+		goto free;
 
 	err = drm_gem_create_mmap_offset(&bo->gem);
-	if (err)
-		goto err_mmap;
+	if (err < 0)
+		goto release;
+
+	return bo;
+
+release:
+	drm_gem_object_release(&bo->gem);
+free:
+	kfree(bo);
+	return ERR_PTR(err);
+}
+
+static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
+{
+	if (bo->pages) {
+		drm_gem_put_pages(&bo->gem, bo->pages, true, true);
+		sg_free_table(bo->sgt);
+		kfree(bo->sgt);
+	} else if (bo->vaddr) {
+		dma_free_writecombine(drm->dev, bo->gem.size, bo->vaddr,
+				      bo->paddr);
+	}
+}
+
+static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo,
+			      size_t size)
+{
+	bo->pages = drm_gem_get_pages(&bo->gem);
+	if (IS_ERR(bo->pages))
+		return PTR_ERR(bo->pages);
+
+	bo->num_pages = size >> PAGE_SHIFT;
+
+	bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
+	if (IS_ERR(bo->sgt)) {
+		drm_gem_put_pages(&bo->gem, bo->pages, false, false);
+		return PTR_ERR(bo->sgt);
+	}
+
+	return 0;
+}
+
+static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo,
+			  size_t size)
+{
+	struct tegra_drm *tegra = drm->dev_private;
+	int err;
+
+	if (tegra->domain) {
+		err = tegra_bo_get_pages(drm, bo, size);
+		if (err < 0)
+			return err;
+
+		err = tegra_bo_iommu_map(tegra, bo);
+		if (err < 0) {
+			tegra_bo_free(drm, bo);
+			return err;
+		}
+	} else {
+		bo->vaddr = dma_alloc_writecombine(drm->dev, size, &bo->paddr,
+						   GFP_KERNEL | __GFP_NOWARN);
+		if (!bo->vaddr) {
+			dev_err(drm->dev,
+				"failed to allocate buffer of size %zu\n",
+				size);
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
+
+struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
+				 unsigned long flags)
+{
+	struct tegra_bo *bo;
+	int err;
+
+	bo = tegra_bo_alloc_object(drm, size);
+	if (IS_ERR(bo))
+		return bo;
+
+	err = tegra_bo_alloc(drm, bo, size);
+	if (err < 0)
+		goto release;
 
 	if (flags & DRM_TEGRA_GEM_CREATE_TILED)
 		bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
@@ -134,69 +286,52 @@ struct tegra_bo *tegra_bo_create(struct drm_device *drm, unsigned int size,
 
 	return bo;
 
-err_mmap:
+release:
 	drm_gem_object_release(&bo->gem);
-err_init:
-	tegra_bo_destroy(drm, bo);
-err_dma:
 	kfree(bo);
-
 	return ERR_PTR(err);
 }
 
 struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
 					     struct drm_device *drm,
-					     unsigned int size,
+					     size_t size,
 					     unsigned long flags,
-					     unsigned int *handle)
+					     u32 *handle)
 {
 	struct tegra_bo *bo;
-	int ret;
+	int err;
 
 	bo = tegra_bo_create(drm, size, flags);
 	if (IS_ERR(bo))
 		return bo;
 
-	ret = drm_gem_handle_create(file, &bo->gem, handle);
-	if (ret)
-		goto err;
+	err = drm_gem_handle_create(file, &bo->gem, handle);
+	if (err) {
+		tegra_bo_free_object(&bo->gem);
+		return ERR_PTR(err);
+	}
 
 	drm_gem_object_unreference_unlocked(&bo->gem);
 
 	return bo;
-
-err:
-	tegra_bo_free_object(&bo->gem);
-	return ERR_PTR(ret);
 }
 
 static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 					struct dma_buf *buf)
 {
+	struct tegra_drm *tegra = drm->dev_private;
 	struct dma_buf_attachment *attach;
 	struct tegra_bo *bo;
-	ssize_t size;
 	int err;
 
-	bo = kzalloc(sizeof(*bo), GFP_KERNEL);
-	if (!bo)
-		return ERR_PTR(-ENOMEM);
-
-	host1x_bo_init(&bo->base, &tegra_bo_ops);
-	size = round_up(buf->size, PAGE_SIZE);
-
-	err = drm_gem_object_init(drm, &bo->gem, size);
-	if (err < 0)
-		goto free;
-
-	err = drm_gem_create_mmap_offset(&bo->gem);
-	if (err < 0)
-		goto release;
+	bo = tegra_bo_alloc_object(drm, buf->size);
+	if (IS_ERR(bo))
+		return bo;
 
 	attach = dma_buf_attach(buf, drm->dev);
 	if (IS_ERR(attach)) {
 		err = PTR_ERR(attach);
-		goto free_mmap;
+		goto free;
 	}
 
 	get_dma_buf(buf);
@@ -212,12 +347,19 @@ static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
 		goto detach;
 	}
 
-	if (bo->sgt->nents > 1) {
-		err = -EINVAL;
-		goto detach;
+	if (tegra->domain) {
+		err = tegra_bo_iommu_map(tegra, bo);
+		if (err < 0)
+			goto detach;
+	} else {
+		if (bo->sgt->nents > 1) {
+			err = -EINVAL;
+			goto detach;
+		}
+
+		bo->paddr = sg_dma_address(bo->sgt->sgl);
 	}
 
-	bo->paddr = sg_dma_address(bo->sgt->sgl);
 	bo->gem.import_attach = attach;
 
 	return bo;
@@ -228,47 +370,41 @@ detach:
 
 	dma_buf_detach(buf, attach);
 	dma_buf_put(buf);
-free_mmap:
-	drm_gem_free_mmap_offset(&bo->gem);
-release:
-	drm_gem_object_release(&bo->gem);
 free:
+	drm_gem_object_release(&bo->gem);
 	kfree(bo);
-
 	return ERR_PTR(err);
 }
 
 void tegra_bo_free_object(struct drm_gem_object *gem)
 {
+	struct tegra_drm *tegra = gem->dev->dev_private;
 	struct tegra_bo *bo = to_tegra_bo(gem);
 
+	if (tegra->domain)
+		tegra_bo_iommu_unmap(tegra, bo);
+
 	if (gem->import_attach) {
 		dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
 					 DMA_TO_DEVICE);
 		drm_prime_gem_destroy(gem, NULL);
 	} else {
-		tegra_bo_destroy(gem->dev, bo);
+		tegra_bo_free(gem->dev, bo);
 	}
 
-	drm_gem_free_mmap_offset(gem);
 	drm_gem_object_release(gem);
-
 	kfree(bo);
 }
 
 int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 			 struct drm_mode_create_dumb *args)
 {
-	int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+	unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 	struct tegra_drm *tegra = drm->dev_private;
 	struct tegra_bo *bo;
 
-	min_pitch = round_up(min_pitch, tegra->pitch_align);
-	if (args->pitch < min_pitch)
-		args->pitch = min_pitch;
-
-	if (args->size < args->pitch * args->height)
-		args->size = args->pitch * args->height;
+	args->pitch = round_up(min_pitch, tegra->pitch_align);
+	args->size = args->pitch * args->height;
 
 	bo = tegra_bo_create_with_handle(file, drm, args->size, 0,
 					 &args->handle);
@@ -279,7 +415,7 @@ int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
 }
 
 int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
-			     uint32_t handle, uint64_t *offset)
+			     u32 handle, u64 *offset)
 {
 	struct drm_gem_object *gem;
 	struct tegra_bo *bo;
@@ -304,7 +440,38 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
 	return 0;
 }
 
+static int tegra_bo_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+	struct drm_gem_object *gem = vma->vm_private_data;
+	struct tegra_bo *bo = to_tegra_bo(gem);
+	struct page *page;
+	pgoff_t offset;
+	int err;
+
+	if (!bo->pages)
+		return VM_FAULT_SIGBUS;
+
+	offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >> PAGE_SHIFT;
+	page = bo->pages[offset];
+
+	err = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
+	switch (err) {
+	case -EAGAIN:
+	case 0:
+	case -ERESTARTSYS:
+	case -EINTR:
+	case -EBUSY:
+		return VM_FAULT_NOPAGE;
+
+	case -ENOMEM:
+		return VM_FAULT_OOM;
+	}
+
+	return VM_FAULT_SIGBUS;
+}
+
 const struct vm_operations_struct tegra_bo_vm_ops = {
+	.fault = tegra_bo_fault,
 	.open = drm_gem_vm_open,
 	.close = drm_gem_vm_close,
 };
@@ -322,12 +489,30 @@ int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
 	gem = vma->vm_private_data;
 	bo = to_tegra_bo(gem);
 
-	ret = remap_pfn_range(vma, vma->vm_start, bo->paddr >> PAGE_SHIFT,
-			      vma->vm_end - vma->vm_start, vma->vm_page_prot);
-	if (ret)
-		drm_gem_vm_close(vma);
+	if (!bo->pages) {
+		unsigned long vm_pgoff = vma->vm_pgoff;
+
+		vma->vm_flags &= ~VM_PFNMAP;
+		vma->vm_pgoff = 0;
+
+		ret = dma_mmap_writecombine(gem->dev->dev, vma, bo->vaddr,
+					    bo->paddr, gem->size);
+		if (ret) {
+			drm_gem_vm_close(vma);
+			return ret;
+		}
+
+		vma->vm_pgoff = vm_pgoff;
+	} else {
+		pgprot_t prot = vm_get_page_prot(vma->vm_flags);
+
+		vma->vm_flags |= VM_MIXEDMAP;
+		vma->vm_flags &= ~VM_PFNMAP;
 
-	return ret;
+		vma->vm_page_prot = pgprot_writecombine(prot);
+	}
+
+	return 0;
 }
 
 static struct sg_table *
@@ -342,21 +527,44 @@ tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
 	if (!sgt)
 		return NULL;
 
-	if (sg_alloc_table(sgt, 1, GFP_KERNEL)) {
-		kfree(sgt);
-		return NULL;
-	}
+	if (bo->pages) {
+		struct scatterlist *sg;
+		unsigned int i;
 
-	sg_dma_address(sgt->sgl) = bo->paddr;
-	sg_dma_len(sgt->sgl) = gem->size;
+		if (sg_alloc_table(sgt, bo->num_pages, GFP_KERNEL))
+			goto free;
+
+		for_each_sg(sgt->sgl, sg, bo->num_pages, i)
+			sg_set_page(sg, bo->pages[i], PAGE_SIZE, 0);
+
+		if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
+			goto free;
+	} else {
+		if (sg_alloc_table(sgt, 1, GFP_KERNEL))
+			goto free;
+
+		sg_dma_address(sgt->sgl) = bo->paddr;
+		sg_dma_len(sgt->sgl) = gem->size;
+	}
 
 	return sgt;
+
+free:
+	sg_free_table(sgt);
+	kfree(sgt);
+	return NULL;
 }
 
 static void tegra_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
 					  struct sg_table *sgt,
 					  enum dma_data_direction dir)
 {
+	struct drm_gem_object *gem = attach->dmabuf->priv;
+	struct tegra_bo *bo = to_tegra_bo(gem);
+
+	if (bo->pages)
+		dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
+
 	sg_free_table(sgt);
 	kfree(sgt);
 }