| /* |
| * NVIDIA Tegra DRM GEM helper functions |
| * |
| * Copyright (C) 2012 Sascha Hauer, Pengutronix |
| * Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved. |
| * |
| * Based on the GEM/CMA helpers |
| * |
| * Copyright (c) 2011 Samsung Electronics Co., Ltd. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/dma-buf.h> |
| #include <linux/iommu.h> |
| #include <drm/tegra_drm.h> |
| |
| #include "drm.h" |
| #include "gem.h" |
| |
| static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo) |
| { |
| return container_of(bo, struct tegra_bo, base); |
| } |
| |
| static void tegra_bo_put(struct host1x_bo *bo) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| struct drm_device *drm = obj->gem.dev; |
| |
| mutex_lock(&drm->struct_mutex); |
| drm_gem_object_unreference(&obj->gem); |
| mutex_unlock(&drm->struct_mutex); |
| } |
| |
| static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| |
| return obj->paddr; |
| } |
| |
| static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt) |
| { |
| } |
| |
| static void *tegra_bo_mmap(struct host1x_bo *bo) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| |
| return obj->vaddr; |
| } |
| |
| static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) |
| { |
| } |
| |
| static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| |
| return obj->vaddr + page * PAGE_SIZE; |
| } |
| |
| static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page, |
| void *addr) |
| { |
| } |
| |
| static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) |
| { |
| struct tegra_bo *obj = host1x_to_tegra_bo(bo); |
| struct drm_device *drm = obj->gem.dev; |
| |
| mutex_lock(&drm->struct_mutex); |
| drm_gem_object_reference(&obj->gem); |
| mutex_unlock(&drm->struct_mutex); |
| |
| return bo; |
| } |
| |
| static const struct host1x_bo_ops tegra_bo_ops = { |
| .get = tegra_bo_get, |
| .put = tegra_bo_put, |
| .pin = tegra_bo_pin, |
| .unpin = tegra_bo_unpin, |
| .mmap = tegra_bo_mmap, |
| .munmap = tegra_bo_munmap, |
| .kmap = tegra_bo_kmap, |
| .kunmap = tegra_bo_kunmap, |
| }; |
| |
| 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; |
| |
| bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
| if (!bo) |
| return ERR_PTR(-ENOMEM); |
| |
| host1x_bo_init(&bo->base, &tegra_bo_ops); |
| size = round_up(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; |
| |
| 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) |
| { |
| struct scatterlist *s; |
| unsigned int i; |
| |
| bo->pages = drm_gem_get_pages(&bo->gem); |
| if (IS_ERR(bo->pages)) |
| return PTR_ERR(bo->pages); |
| |
| bo->num_pages = bo->gem.size >> PAGE_SHIFT; |
| |
| bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages); |
| if (IS_ERR(bo->sgt)) |
| goto put_pages; |
| |
| /* |
| * Fake up the SG table so that dma_sync_sg_for_device() can be used |
| * to flush the pages associated with it. |
| * |
| * TODO: Replace this by drm_clflash_sg() once it can be implemented |
| * without relying on symbols that are not exported. |
| */ |
| for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i) |
| sg_dma_address(s) = sg_phys(s); |
| |
| dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents, |
| DMA_TO_DEVICE); |
| |
| return 0; |
| |
| put_pages: |
| drm_gem_put_pages(&bo->gem, bo->pages, false, false); |
| return PTR_ERR(bo->sgt); |
| } |
| |
| static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo) |
| { |
| struct tegra_drm *tegra = drm->dev_private; |
| int err; |
| |
| if (tegra->domain) { |
| err = tegra_bo_get_pages(drm, bo); |
| if (err < 0) |
| return err; |
| |
| err = tegra_bo_iommu_map(tegra, bo); |
| if (err < 0) { |
| tegra_bo_free(drm, bo); |
| return err; |
| } |
| } else { |
| size_t size = bo->gem.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 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); |
| if (err < 0) |
| goto release; |
| |
| if (flags & DRM_TEGRA_GEM_CREATE_TILED) |
| bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED; |
| |
| if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP) |
| bo->flags |= TEGRA_BO_BOTTOM_UP; |
| |
| return bo; |
| |
| release: |
| drm_gem_object_release(&bo->gem); |
| kfree(bo); |
| return ERR_PTR(err); |
| } |
| |
| struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file, |
| struct drm_device *drm, |
| size_t size, |
| unsigned long flags, |
| u32 *handle) |
| { |
| struct tegra_bo *bo; |
| int err; |
| |
| bo = tegra_bo_create(drm, size, flags); |
| if (IS_ERR(bo)) |
| return bo; |
| |
| 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; |
| } |
| |
| 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; |
| int err; |
| |
| 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; |
| } |
| |
| get_dma_buf(buf); |
| |
| bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE); |
| if (!bo->sgt) { |
| err = -ENOMEM; |
| goto detach; |
| } |
| |
| if (IS_ERR(bo->sgt)) { |
| err = PTR_ERR(bo->sgt); |
| 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->gem.import_attach = attach; |
| |
| return bo; |
| |
| detach: |
| if (!IS_ERR_OR_NULL(bo->sgt)) |
| dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE); |
| |
| dma_buf_detach(buf, attach); |
| dma_buf_put(buf); |
| 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_free(gem->dev, bo); |
| } |
| |
| 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) |
| { |
| unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); |
| struct tegra_drm *tegra = drm->dev_private; |
| struct tegra_bo *bo; |
| |
| 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); |
| if (IS_ERR(bo)) |
| return PTR_ERR(bo); |
| |
| return 0; |
| } |
| |
| int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm, |
| u32 handle, u64 *offset) |
| { |
| struct drm_gem_object *gem; |
| struct tegra_bo *bo; |
| |
| gem = drm_gem_object_lookup(drm, file, handle); |
| if (!gem) { |
| dev_err(drm->dev, "failed to lookup GEM object\n"); |
| return -EINVAL; |
| } |
| |
| bo = to_tegra_bo(gem); |
| |
| *offset = drm_vma_node_offset_addr(&bo->gem.vma_node); |
| |
| drm_gem_object_unreference_unlocked(gem); |
| |
| 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, |
| }; |
| |
| int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| struct drm_gem_object *gem; |
| struct tegra_bo *bo; |
| int ret; |
| |
| ret = drm_gem_mmap(file, vma); |
| if (ret) |
| return ret; |
| |
| gem = vma->vm_private_data; |
| bo = to_tegra_bo(gem); |
| |
| 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; |
| |
| vma->vm_page_prot = pgprot_writecombine(prot); |
| } |
| |
| return 0; |
| } |
| |
| static struct sg_table * |
| tegra_gem_prime_map_dma_buf(struct dma_buf_attachment *attach, |
| enum dma_data_direction dir) |
| { |
| struct drm_gem_object *gem = attach->dmabuf->priv; |
| struct tegra_bo *bo = to_tegra_bo(gem); |
| struct sg_table *sgt; |
| |
| sgt = kmalloc(sizeof(*sgt), GFP_KERNEL); |
| if (!sgt) |
| return NULL; |
| |
| if (bo->pages) { |
| struct scatterlist *sg; |
| unsigned int i; |
| |
| 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); |
| } |
| |
| static void tegra_gem_prime_release(struct dma_buf *buf) |
| { |
| drm_gem_dmabuf_release(buf); |
| } |
| |
| static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf, |
| unsigned long page) |
| { |
| return NULL; |
| } |
| |
| static void tegra_gem_prime_kunmap_atomic(struct dma_buf *buf, |
| unsigned long page, |
| void *addr) |
| { |
| } |
| |
| static void *tegra_gem_prime_kmap(struct dma_buf *buf, unsigned long page) |
| { |
| return NULL; |
| } |
| |
| static void tegra_gem_prime_kunmap(struct dma_buf *buf, unsigned long page, |
| void *addr) |
| { |
| } |
| |
| static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) |
| { |
| return -EINVAL; |
| } |
| |
| static void *tegra_gem_prime_vmap(struct dma_buf *buf) |
| { |
| struct drm_gem_object *gem = buf->priv; |
| struct tegra_bo *bo = to_tegra_bo(gem); |
| |
| return bo->vaddr; |
| } |
| |
| static void tegra_gem_prime_vunmap(struct dma_buf *buf, void *vaddr) |
| { |
| } |
| |
| static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = { |
| .map_dma_buf = tegra_gem_prime_map_dma_buf, |
| .unmap_dma_buf = tegra_gem_prime_unmap_dma_buf, |
| .release = tegra_gem_prime_release, |
| .kmap_atomic = tegra_gem_prime_kmap_atomic, |
| .kunmap_atomic = tegra_gem_prime_kunmap_atomic, |
| .kmap = tegra_gem_prime_kmap, |
| .kunmap = tegra_gem_prime_kunmap, |
| .mmap = tegra_gem_prime_mmap, |
| .vmap = tegra_gem_prime_vmap, |
| .vunmap = tegra_gem_prime_vunmap, |
| }; |
| |
| struct dma_buf *tegra_gem_prime_export(struct drm_device *drm, |
| struct drm_gem_object *gem, |
| int flags) |
| { |
| DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
| |
| exp_info.ops = &tegra_gem_prime_dmabuf_ops; |
| exp_info.size = gem->size; |
| exp_info.flags = flags; |
| exp_info.priv = gem; |
| |
| return dma_buf_export(&exp_info); |
| } |
| |
| struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm, |
| struct dma_buf *buf) |
| { |
| struct tegra_bo *bo; |
| |
| if (buf->ops == &tegra_gem_prime_dmabuf_ops) { |
| struct drm_gem_object *gem = buf->priv; |
| |
| if (gem->dev == drm) { |
| drm_gem_object_reference(gem); |
| return gem; |
| } |
| } |
| |
| bo = tegra_bo_import(drm, buf); |
| if (IS_ERR(bo)) |
| return ERR_CAST(bo); |
| |
| return &bo->gem; |
| } |