639 lines
13 KiB
C
639 lines
13 KiB
C
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/*
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* NVIDIA Tegra DRM GEM helper functions
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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* Copyright (C) 2013 NVIDIA CORPORATION, All rights reserved.
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*
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* Based on the GEM/CMA helpers
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/dma-buf.h>
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#include <linux/iommu.h>
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#include <drm/tegra_drm.h>
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#include "drm.h"
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#include "gem.h"
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static inline struct tegra_bo *host1x_to_tegra_bo(struct host1x_bo *bo)
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{
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return container_of(bo, struct tegra_bo, base);
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}
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static void tegra_bo_put(struct host1x_bo *bo)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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drm_gem_object_unreference_unlocked(&obj->gem);
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}
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static dma_addr_t tegra_bo_pin(struct host1x_bo *bo, struct sg_table **sgt)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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return obj->paddr;
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}
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static void tegra_bo_unpin(struct host1x_bo *bo, struct sg_table *sgt)
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{
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}
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static void *tegra_bo_mmap(struct host1x_bo *bo)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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return obj->vaddr;
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}
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static void tegra_bo_munmap(struct host1x_bo *bo, void *addr)
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{
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}
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static void *tegra_bo_kmap(struct host1x_bo *bo, unsigned int page)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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return obj->vaddr + page * PAGE_SIZE;
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}
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static void tegra_bo_kunmap(struct host1x_bo *bo, unsigned int page,
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void *addr)
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{
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}
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static struct host1x_bo *tegra_bo_get(struct host1x_bo *bo)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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drm_gem_object_reference(&obj->gem);
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return bo;
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}
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static const struct host1x_bo_ops tegra_bo_ops = {
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.get = tegra_bo_get,
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.put = tegra_bo_put,
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.pin = tegra_bo_pin,
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.unpin = tegra_bo_unpin,
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.mmap = tegra_bo_mmap,
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.munmap = tegra_bo_munmap,
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.kmap = tegra_bo_kmap,
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.kunmap = tegra_bo_kunmap,
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};
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static int tegra_bo_iommu_map(struct tegra_drm *tegra, struct tegra_bo *bo)
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{
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int prot = IOMMU_READ | IOMMU_WRITE;
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ssize_t err;
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if (bo->mm)
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return -EBUSY;
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bo->mm = kzalloc(sizeof(*bo->mm), GFP_KERNEL);
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if (!bo->mm)
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return -ENOMEM;
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err = drm_mm_insert_node_generic(&tegra->mm, bo->mm, bo->gem.size,
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PAGE_SIZE, 0, 0, 0);
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if (err < 0) {
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dev_err(tegra->drm->dev, "out of I/O virtual memory: %zd\n",
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err);
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goto free;
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}
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bo->paddr = bo->mm->start;
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err = iommu_map_sg(tegra->domain, bo->paddr, bo->sgt->sgl,
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bo->sgt->nents, prot);
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if (err < 0) {
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dev_err(tegra->drm->dev, "failed to map buffer: %zd\n", err);
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goto remove;
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}
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bo->size = err;
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return 0;
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remove:
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drm_mm_remove_node(bo->mm);
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free:
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kfree(bo->mm);
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return err;
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}
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static int tegra_bo_iommu_unmap(struct tegra_drm *tegra, struct tegra_bo *bo)
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{
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if (!bo->mm)
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return 0;
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iommu_unmap(tegra->domain, bo->paddr, bo->size);
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drm_mm_remove_node(bo->mm);
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kfree(bo->mm);
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return 0;
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}
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static struct tegra_bo *tegra_bo_alloc_object(struct drm_device *drm,
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size_t size)
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{
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struct tegra_bo *bo;
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int err;
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bo = kzalloc(sizeof(*bo), GFP_KERNEL);
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if (!bo)
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return ERR_PTR(-ENOMEM);
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host1x_bo_init(&bo->base, &tegra_bo_ops);
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size = round_up(size, PAGE_SIZE);
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err = drm_gem_object_init(drm, &bo->gem, size);
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if (err < 0)
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goto free;
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err = drm_gem_create_mmap_offset(&bo->gem);
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if (err < 0)
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goto release;
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return bo;
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release:
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drm_gem_object_release(&bo->gem);
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free:
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kfree(bo);
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return ERR_PTR(err);
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}
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static void tegra_bo_free(struct drm_device *drm, struct tegra_bo *bo)
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{
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if (bo->pages) {
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drm_gem_put_pages(&bo->gem, bo->pages, true, true);
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sg_free_table(bo->sgt);
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kfree(bo->sgt);
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} else if (bo->vaddr) {
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dma_free_wc(drm->dev, bo->gem.size, bo->vaddr, bo->paddr);
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}
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}
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static int tegra_bo_get_pages(struct drm_device *drm, struct tegra_bo *bo)
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{
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struct scatterlist *s;
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unsigned int i;
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bo->pages = drm_gem_get_pages(&bo->gem);
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if (IS_ERR(bo->pages))
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return PTR_ERR(bo->pages);
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bo->num_pages = bo->gem.size >> PAGE_SHIFT;
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bo->sgt = drm_prime_pages_to_sg(bo->pages, bo->num_pages);
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if (IS_ERR(bo->sgt))
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goto put_pages;
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/*
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* Fake up the SG table so that dma_sync_sg_for_device() can be used
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* to flush the pages associated with it.
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*
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* TODO: Replace this by drm_clflash_sg() once it can be implemented
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* without relying on symbols that are not exported.
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*/
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for_each_sg(bo->sgt->sgl, s, bo->sgt->nents, i)
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sg_dma_address(s) = sg_phys(s);
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dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
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DMA_TO_DEVICE);
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return 0;
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put_pages:
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drm_gem_put_pages(&bo->gem, bo->pages, false, false);
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return PTR_ERR(bo->sgt);
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}
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static int tegra_bo_alloc(struct drm_device *drm, struct tegra_bo *bo)
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{
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struct tegra_drm *tegra = drm->dev_private;
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int err;
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if (tegra->domain) {
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err = tegra_bo_get_pages(drm, bo);
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if (err < 0)
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return err;
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err = tegra_bo_iommu_map(tegra, bo);
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if (err < 0) {
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tegra_bo_free(drm, bo);
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return err;
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}
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} else {
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size_t size = bo->gem.size;
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bo->vaddr = dma_alloc_wc(drm->dev, size, &bo->paddr,
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GFP_KERNEL | __GFP_NOWARN);
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if (!bo->vaddr) {
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dev_err(drm->dev,
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"failed to allocate buffer of size %zu\n",
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size);
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return -ENOMEM;
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}
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}
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return 0;
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}
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struct tegra_bo *tegra_bo_create(struct drm_device *drm, size_t size,
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unsigned long flags)
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{
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struct tegra_bo *bo;
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int err;
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bo = tegra_bo_alloc_object(drm, size);
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if (IS_ERR(bo))
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return bo;
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err = tegra_bo_alloc(drm, bo);
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if (err < 0)
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goto release;
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if (flags & DRM_TEGRA_GEM_CREATE_TILED)
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bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
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if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
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bo->flags |= TEGRA_BO_BOTTOM_UP;
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return bo;
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release:
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drm_gem_object_release(&bo->gem);
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kfree(bo);
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return ERR_PTR(err);
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}
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struct tegra_bo *tegra_bo_create_with_handle(struct drm_file *file,
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struct drm_device *drm,
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size_t size,
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unsigned long flags,
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u32 *handle)
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{
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struct tegra_bo *bo;
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int err;
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bo = tegra_bo_create(drm, size, flags);
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if (IS_ERR(bo))
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return bo;
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err = drm_gem_handle_create(file, &bo->gem, handle);
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if (err) {
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tegra_bo_free_object(&bo->gem);
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return ERR_PTR(err);
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}
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drm_gem_object_unreference_unlocked(&bo->gem);
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return bo;
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}
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static struct tegra_bo *tegra_bo_import(struct drm_device *drm,
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struct dma_buf *buf)
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{
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struct tegra_drm *tegra = drm->dev_private;
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struct dma_buf_attachment *attach;
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struct tegra_bo *bo;
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int err;
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bo = tegra_bo_alloc_object(drm, buf->size);
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if (IS_ERR(bo))
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return bo;
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attach = dma_buf_attach(buf, drm->dev);
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if (IS_ERR(attach)) {
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err = PTR_ERR(attach);
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goto free;
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}
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get_dma_buf(buf);
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bo->sgt = dma_buf_map_attachment(attach, DMA_TO_DEVICE);
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if (!bo->sgt) {
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err = -ENOMEM;
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goto detach;
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}
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if (IS_ERR(bo->sgt)) {
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err = PTR_ERR(bo->sgt);
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goto detach;
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}
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if (tegra->domain) {
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err = tegra_bo_iommu_map(tegra, bo);
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if (err < 0)
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goto detach;
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} else {
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if (bo->sgt->nents > 1) {
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err = -EINVAL;
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goto detach;
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}
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bo->paddr = sg_dma_address(bo->sgt->sgl);
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}
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bo->gem.import_attach = attach;
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return bo;
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detach:
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if (!IS_ERR_OR_NULL(bo->sgt))
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dma_buf_unmap_attachment(attach, bo->sgt, DMA_TO_DEVICE);
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dma_buf_detach(buf, attach);
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dma_buf_put(buf);
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free:
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drm_gem_object_release(&bo->gem);
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kfree(bo);
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return ERR_PTR(err);
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}
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void tegra_bo_free_object(struct drm_gem_object *gem)
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{
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struct tegra_drm *tegra = gem->dev->dev_private;
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struct tegra_bo *bo = to_tegra_bo(gem);
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if (tegra->domain)
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tegra_bo_iommu_unmap(tegra, bo);
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if (gem->import_attach) {
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dma_buf_unmap_attachment(gem->import_attach, bo->sgt,
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DMA_TO_DEVICE);
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drm_prime_gem_destroy(gem, NULL);
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} else {
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tegra_bo_free(gem->dev, bo);
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}
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drm_gem_object_release(gem);
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kfree(bo);
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}
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int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm,
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struct drm_mode_create_dumb *args)
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{
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unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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struct tegra_drm *tegra = drm->dev_private;
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struct tegra_bo *bo;
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args->pitch = round_up(min_pitch, tegra->pitch_align);
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args->size = args->pitch * args->height;
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|
|
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(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_wc(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 drm_gem_dmabuf_export(drm, &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;
|
||
|
|
}
|