[PATCH 3/3] drm/tegra: Implement correct DMA-BUF semantics

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From: Thierry Reding <treding@xxxxxxxxxx>

DMA-BUF requires that each device that accesses a DMA-BUF attaches to it
separately. To do so the host1x_bo_pin() and host1x_bo_unpin() functions
need to be reimplemented so that they can return a mapping, which either
represents an attachment or a map of the driver's own GEM object.

Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
 drivers/gpu/drm/tegra/gem.c   | 131 +++++++++++++++++++++-------------
 drivers/gpu/drm/tegra/plane.c |  47 ++++--------
 drivers/gpu/drm/tegra/plane.h |   2 +-
 drivers/gpu/host1x/job.c      | 127 ++++++++++++--------------------
 drivers/gpu/host1x/job.h      |   6 +-
 include/linux/host1x.h        |  32 ++++++---
 6 files changed, 162 insertions(+), 183 deletions(-)

diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 1237df157e05..c085499067ed 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -27,71 +27,77 @@ static void tegra_bo_put(struct host1x_bo *bo)
 	drm_gem_object_put_unlocked(&obj->gem);
 }
 
-/* XXX move this into lib/scatterlist.c? */
-static int sg_alloc_table_from_sg(struct sg_table *sgt, struct scatterlist *sg,
-				  unsigned int nents, gfp_t gfp_mask)
+static struct host1x_bo_mapping *
+tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
+	     enum dma_data_direction direction)
 {
-	struct scatterlist *dst;
-	unsigned int i;
+	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
+	struct drm_gem_object *gem = &obj->gem;
+	struct host1x_bo_mapping *map;
 	int err;
 
-	err = sg_alloc_table(sgt, nents, gfp_mask);
-	if (err < 0)
-		return err;
-
-	dst = sgt->sgl;
+	map = kzalloc(sizeof(*map), GFP_KERNEL);
+	if (!map)
+		return ERR_PTR(-ENOMEM);
 
-	for (i = 0; i < nents; i++) {
-		sg_set_page(dst, sg_page(sg), sg->length, 0);
-		dst = sg_next(dst);
-		sg = sg_next(sg);
-	}
-
-	return 0;
-}
-
-static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
-				     dma_addr_t *phys)
-{
-	struct tegra_bo *obj = host1x_to_tegra_bo(bo);
-	struct sg_table *sgt;
-	int err;
+	map->direction = direction;
+	map->dev = dev;
+	map->bo = bo;
 
 	/*
 	 * If we've manually mapped the buffer object through the IOMMU, make
 	 * sure to return the IOVA address of our mapping.
 	 */
-	if (phys && obj->mm) {
-		*phys = obj->iova;
-		return NULL;
+	if (obj->mm) {
+		map->phys = obj->iova;
+		return map;
+	}
+
+	/*
+	 * Imported buffers need special treatment to satisfy the semantics of
+	 * DMA-BUF.
+	 */
+	if (gem->import_attach) {
+		struct dma_buf *buf = gem->import_attach->dmabuf;
+
+		map->attach = dma_buf_attach(buf, dev);
+		if (IS_ERR(map->attach)) {
+			err = PTR_ERR(map->attach);
+			goto free;
+		}
+
+		map->sgt = dma_buf_map_attachment(map->attach, direction);
+		if (IS_ERR(map->sgt)) {
+			dma_buf_detach(buf, map->attach);
+			err = PTR_ERR(map->sgt);
+			goto free;
+		}
+
+		map->chunks = sgt_dma_count_chunks(map->sgt);
+		map->phys = sg_dma_address(map->sgt->sgl);
+		map->size = gem->size;
+
+		return map;
 	}
 
 	/*
 	 * If we don't have a mapping for this buffer yet, return an SG table
 	 * so that host1x can do the mapping for us via the DMA API.
 	 */
-	sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
-	if (!sgt)
-		return ERR_PTR(-ENOMEM);
+	map->sgt = kzalloc(sizeof(*map->sgt), GFP_KERNEL);
+	if (!map->sgt) {
+		err = -ENOMEM;
+		goto free;
+	}
 
 	if (obj->pages) {
 		/*
 		 * If the buffer object was allocated from the explicit IOMMU
 		 * API code paths, construct an SG table from the pages.
 		 */
-		err = sg_alloc_table_from_pages(sgt, obj->pages, obj->num_pages,
-						0, obj->gem.size, GFP_KERNEL);
-		if (err < 0)
-			goto free;
-	} else if (obj->sgt) {
-		/*
-		 * If the buffer object already has an SG table but no pages
-		 * were allocated for it, it means the buffer was imported and
-		 * the SG table needs to be copied to avoid overwriting any
-		 * other potential users of the original SG table.
-		 */
-		err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, obj->sgt->nents,
-					     GFP_KERNEL);
+		err = sg_alloc_table_from_pages(map->sgt, obj->pages,
+						obj->num_pages, 0,
+						obj->gem.size, GFP_KERNEL);
 		if (err < 0)
 			goto free;
 	} else {
@@ -100,25 +106,48 @@ static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
 		 * not imported, it had to be allocated with the DMA API, so
 		 * the DMA API helper can be used.
 		 */
-		err = dma_get_sgtable(dev, sgt, obj->vaddr, obj->iova,
+		err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova,
 				      obj->gem.size);
 		if (err < 0)
 			goto free;
 	}
 
-	return sgt;
+	err = dma_map_sg(dev, map->sgt->sgl, map->sgt->nents, direction);
+	if (!err) {
+		err = -ENOMEM;
+		goto free_sgt;
+	}
+
+	map->phys = sg_dma_address(map->sgt->sgl);
+	map->size = gem->size;
+	map->chunks = err;
+
+	return map;
 
+free_sgt:
+	sg_free_table(map->sgt);
 free:
-	kfree(sgt);
+	kfree(map->sgt);
+	kfree(map);
 	return ERR_PTR(err);
 }
 
-static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
+static void tegra_bo_unpin(struct host1x_bo_mapping *map)
 {
-	if (sgt) {
-		sg_free_table(sgt);
-		kfree(sgt);
+	if (!map)
+		return;
+
+	if (map->attach) {
+		dma_buf_unmap_attachment(map->attach, map->sgt, map->direction);
+		dma_buf_detach(map->attach->dmabuf, map->attach);
+	} else {
+		dma_unmap_sg(map->dev, map->sgt->sgl, map->sgt->nents,
+			     map->direction);
+		sg_free_table(map->sgt);
+		kfree(map->sgt);
 	}
+
+	kfree(map);
 }
 
 static void *tegra_bo_mmap(struct host1x_bo *bo)
diff --git a/drivers/gpu/drm/tegra/plane.c b/drivers/gpu/drm/tegra/plane.c
index cadcdd9ea427..28cf668026da 100644
--- a/drivers/gpu/drm/tegra/plane.c
+++ b/drivers/gpu/drm/tegra/plane.c
@@ -67,7 +67,7 @@ tegra_plane_atomic_duplicate_state(struct drm_plane *plane)
 
 	for (i = 0; i < 3; i++) {
 		copy->iova[i] = DMA_MAPPING_ERROR;
-		copy->sgt[i] = NULL;
+		copy->map[i] = NULL;
 	}
 
 	return &copy->base;
@@ -114,18 +114,11 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
 		struct tegra_bo *bo = tegra_fb_get_plane(state->base.fb, i);
 
 		if (!dc->client.group) {
-			struct sg_table *sgt;
+			struct host1x_bo_mapping *map;
 
-			sgt = host1x_bo_pin(dc->dev, &bo->base, NULL);
-			if (IS_ERR(sgt)) {
-				err = PTR_ERR(sgt);
-				goto unpin;
-			}
-
-			err = dma_map_sg(dc->dev, sgt->sgl, sgt->nents,
-					 DMA_TO_DEVICE);
-			if (err == 0) {
-				err = -ENOMEM;
+			map = host1x_bo_pin(dc->dev, &bo->base, DMA_TO_DEVICE);
+			if (IS_ERR(map)) {
+				err = PTR_ERR(map);
 				goto unpin;
 			}
 
@@ -135,13 +128,13 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
 			 * map its SG table to a single contiguous chunk of
 			 * I/O virtual memory.
 			 */
-			if (err > 1) {
+			if (map->chunks > 1) {
 				err = -EINVAL;
 				goto unpin;
 			}
 
-			state->iova[i] = sg_dma_address(sgt->sgl);
-			state->sgt[i] = sgt;
+			state->iova[i] = map->phys;
+			state->map[i] = map;
 		} else {
 			state->iova[i] = bo->iova;
 		}
@@ -153,14 +146,9 @@ static int tegra_dc_pin(struct tegra_dc *dc, struct tegra_plane_state *state)
 	dev_err(dc->dev, "failed to map plane %u: %d\n", i, err);
 
 	while (i--) {
-		struct tegra_bo *bo = tegra_fb_get_plane(state->base.fb, i);
-		struct sg_table *sgt = state->sgt[i];
-
-		dma_unmap_sg(dc->dev, sgt->sgl, sgt->nents, DMA_TO_DEVICE);
-		host1x_bo_unpin(dc->dev, &bo->base, sgt);
-
+		host1x_bo_unpin(state->map[i]);
 		state->iova[i] = DMA_MAPPING_ERROR;
-		state->sgt[i] = NULL;
+		state->map[i] = NULL;
 	}
 
 	return err;
@@ -171,20 +159,11 @@ static void tegra_dc_unpin(struct tegra_dc *dc, struct tegra_plane_state *state)
 	unsigned int i;
 
 	for (i = 0; i < state->base.fb->format->num_planes; i++) {
-		struct tegra_bo *bo = tegra_fb_get_plane(state->base.fb, i);
-
-		if (!dc->client.group) {
-			struct sg_table *sgt = state->sgt[i];
-
-			if (sgt) {
-				dma_unmap_sg(dc->dev, sgt->sgl, sgt->nents,
-					     DMA_TO_DEVICE);
-				host1x_bo_unpin(dc->dev, &bo->base, sgt);
-			}
-		}
+		if (!dc->client.group)
+			host1x_bo_unpin(state->map[i]);
 
 		state->iova[i] = DMA_MAPPING_ERROR;
-		state->sgt[i] = NULL;
+		state->map[i] = NULL;
 	}
 }
 
diff --git a/drivers/gpu/drm/tegra/plane.h b/drivers/gpu/drm/tegra/plane.h
index a158a915109a..08df1ba1f567 100644
--- a/drivers/gpu/drm/tegra/plane.h
+++ b/drivers/gpu/drm/tegra/plane.h
@@ -39,7 +39,7 @@ struct tegra_plane_legacy_blending_state {
 struct tegra_plane_state {
 	struct drm_plane_state base;
 
-	struct sg_table *sgt[3];
+	struct host1x_bo_mapping *map[3];
 	dma_addr_t iova[3];
 
 	struct tegra_bo_tiling tiling;
diff --git a/drivers/gpu/host1x/job.c b/drivers/gpu/host1x/job.c
index 60b2fedd0061..88e445553df3 100644
--- a/drivers/gpu/host1x/job.c
+++ b/drivers/gpu/host1x/job.c
@@ -99,6 +99,7 @@ EXPORT_SYMBOL(host1x_job_add_gather);
 
 static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 {
+	unsigned long mask = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
 	struct host1x_client *client = job->client;
 	struct device *dev = client->dev;
 	unsigned int i;
@@ -108,8 +109,8 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 
 	for (i = 0; i < job->num_relocs; i++) {
 		struct host1x_reloc *reloc = &job->relocs[i];
-		dma_addr_t phys_addr, *phys;
-		struct sg_table *sgt;
+		enum dma_data_direction direction;
+		struct host1x_bo_mapping *map;
 
 		reloc->target.bo = host1x_bo_get(reloc->target.bo);
 		if (!reloc->target.bo) {
@@ -117,63 +118,40 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 			goto unpin;
 		}
 
-		if (client->group)
-			phys = &phys_addr;
-		else
-			phys = NULL;
-
-		sgt = host1x_bo_pin(dev, reloc->target.bo, phys);
-		if (IS_ERR(sgt)) {
-			err = PTR_ERR(sgt);
-			goto unpin;
-		}
-
-		if (sgt) {
-			unsigned long mask = HOST1X_RELOC_READ |
-					     HOST1X_RELOC_WRITE;
-			enum dma_data_direction dir;
-
-			switch (reloc->flags & mask) {
-			case HOST1X_RELOC_READ:
-				dir = DMA_TO_DEVICE;
-				break;
-
-			case HOST1X_RELOC_WRITE:
-				dir = DMA_FROM_DEVICE;
-				break;
+		switch (reloc->flags & mask) {
+		case HOST1X_RELOC_READ:
+			direction = DMA_TO_DEVICE;
+			break;
 
-			case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
-				dir = DMA_BIDIRECTIONAL;
-				break;
+		case HOST1X_RELOC_WRITE:
+			direction = DMA_FROM_DEVICE;
+			break;
 
-			default:
-				err = -EINVAL;
-				goto unpin;
-			}
+		case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
+			direction = DMA_BIDIRECTIONAL;
+			break;
 
-			err = dma_map_sg(dev, sgt->sgl, sgt->nents, dir);
-			if (!err) {
-				err = -ENOMEM;
-				goto unpin;
-			}
+		default:
+			err = -EINVAL;
+			goto unpin;
+		}
 
-			job->unpins[job->num_unpins].dev = dev;
-			job->unpins[job->num_unpins].dir = dir;
-			phys_addr = sg_dma_address(sgt->sgl);
+		map = host1x_bo_pin(dev, reloc->target.bo, direction);
+		if (IS_ERR(map)) {
+			err = PTR_ERR(map);
+			goto unpin;
 		}
 
-		job->addr_phys[job->num_unpins] = phys_addr;
-		job->unpins[job->num_unpins].bo = reloc->target.bo;
-		job->unpins[job->num_unpins].sgt = sgt;
+		job->addr_phys[job->num_unpins] = map->phys;
+		job->unpins[job->num_unpins].map = map;
 		job->num_unpins++;
 	}
 
 	for (i = 0; i < job->num_gathers; i++) {
 		struct host1x_job_gather *g = &job->gathers[i];
+		struct host1x_bo_mapping *map;
 		size_t gather_size = 0;
 		struct scatterlist *sg;
-		struct sg_table *sgt;
-		dma_addr_t phys_addr;
 		unsigned long shift;
 		struct iova *alloc;
 		unsigned int j;
@@ -184,15 +162,16 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 			goto unpin;
 		}
 
-		sgt = host1x_bo_pin(host->dev, g->bo, NULL);
-		if (IS_ERR(sgt)) {
-			err = PTR_ERR(sgt);
+		map = host1x_bo_pin(host->dev, g->bo, DMA_TO_DEVICE);
+		if (IS_ERR(map)) {
+			err = PTR_ERR(map);
 			goto unpin;
 		}
 
 		if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) && host->domain) {
-			for_each_sg(sgt->sgl, sg, sgt->nents, j)
+			for_each_sg(map->sgt->sgl, sg, map->sgt->nents, j)
 				gather_size += sg->length;
+
 			gather_size = iova_align(&host->iova, gather_size);
 
 			shift = iova_shift(&host->iova);
@@ -204,35 +183,24 @@ static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 			}
 
 			err = iommu_map_sg(host->domain,
-					iova_dma_addr(&host->iova, alloc),
-					sgt->sgl, sgt->nents, IOMMU_READ);
+					   iova_dma_addr(&host->iova, alloc),
+					   map->sgt->sgl, map->sgt->nents,
+					   IOMMU_READ);
 			if (err == 0) {
 				__free_iova(&host->iova, alloc);
 				err = -EINVAL;
 				goto unpin;
 			}
 
-			job->unpins[job->num_unpins].size = gather_size;
-			phys_addr = iova_dma_addr(&host->iova, alloc);
-		} else {
-			err = dma_map_sg(host->dev, sgt->sgl, sgt->nents,
-					 DMA_TO_DEVICE);
-			if (!err) {
-				err = -ENOMEM;
-				goto unpin;
-			}
-
-			job->unpins[job->num_unpins].dev = host->dev;
-			phys_addr = sg_dma_address(sgt->sgl);
+			map->phys = iova_dma_addr(&host->iova, alloc);
+			map->size = gather_size;
 		}
 
-		job->addr_phys[job->num_unpins] = phys_addr;
-		job->gather_addr_phys[i] = phys_addr;
-
-		job->unpins[job->num_unpins].dir = DMA_TO_DEVICE;
-		job->unpins[job->num_unpins].bo = g->bo;
-		job->unpins[job->num_unpins].sgt = sgt;
+		job->addr_phys[job->num_unpins] = map->phys;
+		job->unpins[job->num_unpins].map = map;
 		job->num_unpins++;
+
+		job->gather_addr_phys[i] = map->phys;
 	}
 
 	return 0;
@@ -608,24 +576,19 @@ void host1x_job_unpin(struct host1x_job *job)
 	unsigned int i;
 
 	for (i = 0; i < job->num_unpins; i++) {
-		struct host1x_job_unpin_data *unpin = &job->unpins[i];
-		struct device *dev = unpin->dev ?: host->dev;
-		struct sg_table *sgt = unpin->sgt;
+		struct host1x_bo_mapping *map = job->unpins[i].map;
+		struct host1x_bo *bo = map->bo;
 
 		if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) &&
-		    unpin->size && host->domain) {
+		    map->size && host->domain) {
 			iommu_unmap(host->domain, job->addr_phys[i],
-				    unpin->size);
+				    map->size);
 			free_iova(&host->iova,
-				iova_pfn(&host->iova, job->addr_phys[i]));
+				  iova_pfn(&host->iova, job->addr_phys[i]));
 		}
 
-		if (unpin->dev && sgt)
-			dma_unmap_sg(unpin->dev, sgt->sgl, sgt->nents,
-				     unpin->dir);
-
-		host1x_bo_unpin(dev, unpin->bo, sgt);
-		host1x_bo_put(unpin->bo);
+		host1x_bo_unpin(map);
+		host1x_bo_put(bo);
 	}
 
 	job->num_unpins = 0;
diff --git a/drivers/gpu/host1x/job.h b/drivers/gpu/host1x/job.h
index 94bc2e4ae241..c28eebb8ce14 100644
--- a/drivers/gpu/host1x/job.h
+++ b/drivers/gpu/host1x/job.h
@@ -19,11 +19,7 @@ struct host1x_job_gather {
 };
 
 struct host1x_job_unpin_data {
-	struct host1x_bo *bo;
-	struct sg_table *sgt;
-	struct device *dev;
-	size_t size;
-	enum dma_data_direction dir;
+	struct host1x_bo_mapping *map;
 };
 
 /*
diff --git a/include/linux/host1x.h b/include/linux/host1x.h
index 0254ebcdc0a7..f1e6fad19289 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h
@@ -7,6 +7,7 @@
 #define __LINUX_HOST1X_H
 
 #include <linux/device.h>
+#include <linux/dma-direction.h>
 #include <linux/types.h>
 
 enum host1x_class {
@@ -72,12 +73,24 @@ struct host1x_client {
 struct host1x_bo;
 struct sg_table;
 
+struct host1x_bo_mapping {
+	struct dma_buf_attachment *attach;
+	enum dma_data_direction direction;
+	struct host1x_bo *bo;
+	struct sg_table *sgt;
+	unsigned int chunks;
+	struct device *dev;
+	dma_addr_t phys;
+	size_t size;
+};
+
 struct host1x_bo_ops {
 	struct host1x_bo *(*get)(struct host1x_bo *bo);
 	void (*put)(struct host1x_bo *bo);
-	struct sg_table *(*pin)(struct device *dev, struct host1x_bo *bo,
-				dma_addr_t *phys);
-	void (*unpin)(struct device *dev, struct sg_table *sgt);
+	struct host1x_bo_mapping *(*pin)(struct device *dev,
+					 struct host1x_bo *bo,
+					 enum dma_data_direction dir);
+	void (*unpin)(struct host1x_bo_mapping *map);
 	void *(*mmap)(struct host1x_bo *bo);
 	void (*munmap)(struct host1x_bo *bo, void *addr);
 };
@@ -102,17 +115,16 @@ static inline void host1x_bo_put(struct host1x_bo *bo)
 	bo->ops->put(bo);
 }
 
-static inline struct sg_table *host1x_bo_pin(struct device *dev,
-					     struct host1x_bo *bo,
-					     dma_addr_t *phys)
+static inline struct host1x_bo_mapping *
+host1x_bo_pin(struct device *dev, struct host1x_bo *bo,
+	      enum dma_data_direction dir)
 {
-	return bo->ops->pin(dev, bo, phys);
+	return bo->ops->pin(dev, bo, dir);
 }
 
-static inline void host1x_bo_unpin(struct device *dev, struct host1x_bo *bo,
-				   struct sg_table *sgt)
+static inline void host1x_bo_unpin(struct host1x_bo_mapping *map)
 {
-	bo->ops->unpin(dev, sgt);
+	map->bo->ops->unpin(map);
 }
 
 static inline void *host1x_bo_mmap(struct host1x_bo *bo)
-- 
2.23.0

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