diff options
Diffstat (limited to 'drivers/gpu/drm/tegra/gem.c')
| -rw-r--r-- | drivers/gpu/drm/tegra/gem.c | 784 |
1 files changed, 784 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c new file mode 100644 index 000000000..81991090a --- /dev/null +++ b/drivers/gpu/drm/tegra/gem.c @@ -0,0 +1,784 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * NVIDIA Tegra DRM GEM helper functions + * + * Copyright (C) 2012 Sascha Hauer, Pengutronix + * Copyright (C) 2013-2015 NVIDIA CORPORATION, All rights reserved. + * + * Based on the GEM/CMA helpers + * + * Copyright (c) 2011 Samsung Electronics Co., Ltd. + */ + +#include <linux/dma-buf.h> +#include <linux/iommu.h> +#include <linux/module.h> + +#include <drm/drm_drv.h> +#include <drm/drm_prime.h> +#include <drm/tegra_drm.h> + +#include "drm.h" +#include "gem.h" + +MODULE_IMPORT_NS(DMA_BUF); + +static unsigned int sg_dma_count_chunks(struct scatterlist *sgl, unsigned int nents) +{ + dma_addr_t next = ~(dma_addr_t)0; + unsigned int count = 0, i; + struct scatterlist *s; + + for_each_sg(sgl, s, nents, i) { + /* sg_dma_address(s) is only valid for entries that have sg_dma_len(s) != 0. */ + if (!sg_dma_len(s)) + continue; + + if (sg_dma_address(s) != next) { + next = sg_dma_address(s) + sg_dma_len(s); + count++; + } + } + + return count; +} + +static inline unsigned int sgt_dma_count_chunks(struct sg_table *sgt) +{ + return sg_dma_count_chunks(sgt->sgl, sgt->nents); +} + +static void tegra_bo_put(struct host1x_bo *bo) +{ + struct tegra_bo *obj = host1x_to_tegra_bo(bo); + + drm_gem_object_put(&obj->gem); +} + +static struct host1x_bo_mapping *tegra_bo_pin(struct device *dev, struct host1x_bo *bo, + enum dma_data_direction direction) +{ + struct tegra_bo *obj = host1x_to_tegra_bo(bo); + struct drm_gem_object *gem = &obj->gem; + struct host1x_bo_mapping *map; + int err; + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return ERR_PTR(-ENOMEM); + + kref_init(&map->ref); + map->bo = host1x_bo_get(bo); + map->direction = direction; + map->dev = dev; + + /* + * 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); + map->sgt = NULL; + goto free; + } + + err = sgt_dma_count_chunks(map->sgt); + map->size = gem->size; + + goto out; + } + + /* + * 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. + */ + 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(map->sgt, obj->pages, obj->num_pages, 0, gem->size, + GFP_KERNEL); + if (err < 0) + goto free; + } else { + /* + * If the buffer object had no pages allocated and if it was + * not imported, it had to be allocated with the DMA API, so + * the DMA API helper can be used. + */ + err = dma_get_sgtable(dev, map->sgt, obj->vaddr, obj->iova, gem->size); + if (err < 0) + goto free; + } + + err = dma_map_sgtable(dev, map->sgt, direction, 0); + if (err) + goto free_sgt; + +out: + /* + * If we've manually mapped the buffer object through the IOMMU, make sure to return the + * existing IOVA address of our mapping. + */ + if (!obj->mm) { + map->phys = sg_dma_address(map->sgt->sgl); + map->chunks = err; + } else { + map->phys = obj->iova; + map->chunks = 1; + } + + map->size = gem->size; + + return map; + +free_sgt: + sg_free_table(map->sgt); +free: + kfree(map->sgt); + kfree(map); + return ERR_PTR(err); +} + +static void tegra_bo_unpin(struct host1x_bo_mapping *map) +{ + if (map->attach) { + dma_buf_unmap_attachment(map->attach, map->sgt, map->direction); + dma_buf_detach(map->attach->dmabuf, map->attach); + } else { + dma_unmap_sgtable(map->dev, map->sgt, map->direction, 0); + sg_free_table(map->sgt); + kfree(map->sgt); + } + + host1x_bo_put(map->bo); + kfree(map); +} + +static void *tegra_bo_mmap(struct host1x_bo *bo) +{ + struct tegra_bo *obj = host1x_to_tegra_bo(bo); + struct iosys_map map; + int ret; + + if (obj->vaddr) { + return obj->vaddr; + } else if (obj->gem.import_attach) { + ret = dma_buf_vmap(obj->gem.import_attach->dmabuf, &map); + return ret ? NULL : map.vaddr; + } else { + return vmap(obj->pages, obj->num_pages, VM_MAP, + pgprot_writecombine(PAGE_KERNEL)); + } +} + +static void tegra_bo_munmap(struct host1x_bo *bo, void *addr) +{ + struct tegra_bo *obj = host1x_to_tegra_bo(bo); + struct iosys_map map = IOSYS_MAP_INIT_VADDR(addr); + + if (obj->vaddr) + return; + else if (obj->gem.import_attach) + dma_buf_vunmap(obj->gem.import_attach->dmabuf, &map); + else + vunmap(addr); +} + +static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo) +{ + struct tegra_bo *obj = host1x_to_tegra_bo(bo); + + drm_gem_object_get(&obj->gem); + + 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, +}; + +static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo) +{ + int prot = IOMMU_READ | IOMMU_WRITE; + int err; + + if (bo->mm) + return -EBUSY; + + bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL); + if (!bo->mm) + return -ENOMEM; + + mutex_lock(&tegra->mm_lock); + + err = drm_mm_insert_node_generic(&tegra->mm, + bo->mm, bo->gem.size, PAGE_SIZE, 0, 0); + if (err < 0) { + dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n", + err); + goto unlock; + } + + bo->iova = bo->mm->start; + + bo->size = iommu_map_sgtable(tegra->domain, bo->iova, bo->sgt, prot); + if (!bo->size) { + dev_err(tegra->drm->dev, "failed to map buffer\n"); + err = -ENOMEM; + goto remove; + } + + mutex_unlock(&tegra->mm_lock); + + return 0; + +remove: + drm_mm_remove_node(bo->mm); +unlock: + mutex_unlock(&tegra->mm_lock); + kfree(bo->mm); + return err; +} + +static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo) +{ + if (!bo->mm) + return 0; + + mutex_lock(&tegra->mm_lock); + iommu_unmap(tegra->domain, bo->iova, bo->size); + drm_mm_remove_node(bo->mm); + mutex_unlock(&tegra->mm_lock); + + kfree(bo->mm); + + return 0; +} + +static const struct drm_gem_object_funcs tegra_gem_object_funcs = { + .free = tegra_bo_free_object, + .export = tegra_gem_prime_export, + .vm_ops = &tegra_bo_vm_ops, +}; + +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); + + bo->gem.funcs = &tegra_gem_object_funcs; + + 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) { + dma_unmap_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); + drm_gem_put_pages(&bo->gem, bo->pages, true, true); + sg_free_table(bo->sgt); + kfree(bo->sgt); + } else if (bo->vaddr) { + dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->iova); + } +} + +static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo) +{ + int err; + + 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->gem.dev, bo->pages, bo->num_pages); + if (IS_ERR(bo->sgt)) { + err = PTR_ERR(bo->sgt); + goto put_pages; + } + + err = dma_map_sgtable(drm->dev, bo->sgt, DMA_FROM_DEVICE, 0); + if (err) + goto free_sgt; + + return 0; + +free_sgt: + sg_free_table(bo->sgt); + kfree(bo->sgt); +put_pages: + drm_gem_put_pages(&bo->gem, bo->pages, false, false); + return err; +} + +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_wc(drm->dev, size, &bo->iova, + 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_put(&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 (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; + } + + 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 host1x_bo_mapping *mapping, *tmp; + struct tegra_bo *bo = to_tegra_bo(gem); + + /* remove all mappings of this buffer object from any caches */ + list_for_each_entry_safe(mapping, tmp, &bo->base.mappings, list) { + if (mapping->cache) + host1x_bo_unpin(mapping); + else + dev_err(gem->dev->dev, "mapping %p stale for device %s\n", mapping, + dev_name(mapping->dev)); + } + + 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; +} + +static vm_fault_t tegra_bo_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + struct drm_gem_object *gem = vma->vm_private_data; + struct tegra_bo *bo = to_tegra_bo(gem); + struct page *page; + pgoff_t offset; + + if (!bo->pages) + return VM_FAULT_SIGBUS; + + offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; + page = bo->pages[offset]; + + return vmf_insert_page(vma, vmf->address, page); +} + +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_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma) +{ + struct tegra_bo *bo = to_tegra_bo(gem); + + if (!bo->pages) { + unsigned long vm_pgoff = vma->vm_pgoff; + int err; + + /* + * Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), + * and set the vm_pgoff (used as a fake buffer offset by DRM) + * to 0 as we want to map the whole buffer. + */ + vma->vm_flags &= ~VM_PFNMAP; + vma->vm_pgoff = 0; + + err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova, + gem->size); + if (err < 0) { + drm_gem_vm_close(vma); + return err; + } + + 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; +} + +int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct drm_gem_object *gem; + int err; + + err = drm_gem_mmap(file, vma); + if (err < 0) + return err; + + gem = vma->vm_private_data; + + return __tegra_gem_mmap(gem, vma); +} + +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) { + if (sg_alloc_table_from_pages(sgt, bo->pages, bo->num_pages, + 0, gem->size, GFP_KERNEL) < 0) + goto free; + } else { + if (dma_get_sgtable(attach->dev, sgt, bo->vaddr, bo->iova, + gem->size) < 0) + goto free; + } + + if (dma_map_sgtable(attach->dev, sgt, dir, 0)) + goto free; + + 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_sgtable(attach->dev, sgt, dir, 0); + + sg_free_table(sgt); + kfree(sgt); +} + +static void tegra_gem_prime_release(struct dma_buf *buf) +{ + drm_gem_dmabuf_release(buf); +} + +static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf, + enum dma_data_direction direction) +{ + struct drm_gem_object *gem = buf->priv; + struct tegra_bo *bo = to_tegra_bo(gem); + struct drm_device *drm = gem->dev; + + if (bo->pages) + dma_sync_sgtable_for_cpu(drm->dev, bo->sgt, DMA_FROM_DEVICE); + + return 0; +} + +static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf, + enum dma_data_direction direction) +{ + struct drm_gem_object *gem = buf->priv; + struct tegra_bo *bo = to_tegra_bo(gem); + struct drm_device *drm = gem->dev; + + if (bo->pages) + dma_sync_sgtable_for_device(drm->dev, bo->sgt, DMA_TO_DEVICE); + + return 0; +} + +static int tegra_gem_prime_mmap(struct dma_buf *buf, struct vm_area_struct *vma) +{ + struct drm_gem_object *gem = buf->priv; + int err; + + err = drm_gem_mmap_obj(gem, gem->size, vma); + if (err < 0) + return err; + + return __tegra_gem_mmap(gem, vma); +} + +static int tegra_gem_prime_vmap(struct dma_buf *buf, struct iosys_map *map) +{ + struct drm_gem_object *gem = buf->priv; + struct tegra_bo *bo = to_tegra_bo(gem); + void *vaddr; + + vaddr = tegra_bo_mmap(&bo->base); + if (IS_ERR(vaddr)) + return PTR_ERR(vaddr); + + iosys_map_set_vaddr(map, vaddr); + + return 0; +} + +static void tegra_gem_prime_vunmap(struct dma_buf *buf, struct iosys_map *map) +{ + struct drm_gem_object *gem = buf->priv; + struct tegra_bo *bo = to_tegra_bo(gem); + + tegra_bo_munmap(&bo->base, map->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, + .begin_cpu_access = tegra_gem_prime_begin_cpu_access, + .end_cpu_access = tegra_gem_prime_end_cpu_access, + .mmap = tegra_gem_prime_mmap, + .vmap = tegra_gem_prime_vmap, + .vunmap = tegra_gem_prime_vunmap, +}; + +struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem, + int flags) +{ + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + + exp_info.exp_name = KBUILD_MODNAME; + exp_info.owner = gem->dev->driver->fops->owner; + exp_info.ops = &tegra_gem_prime_dmabuf_ops; + exp_info.size = gem->size; + exp_info.flags = flags; + exp_info.priv = gem; + + return drm_gem_dmabuf_export(gem->dev, &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_get(gem); + return gem; + } + } + + bo = tegra_bo_import(drm, buf); + if (IS_ERR(bo)) + return ERR_CAST(bo); + + return &bo->gem; +} + +struct host1x_bo *tegra_gem_lookup(struct drm_file *file, u32 handle) +{ + struct drm_gem_object *gem; + struct tegra_bo *bo; + + gem = drm_gem_object_lookup(file, handle); + if (!gem) + return NULL; + + bo = to_tegra_bo(gem); + return &bo->base; +} |