702 lines
15 KiB
C
702 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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) 2013-2015 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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#include <linux/dma-buf.h>
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#include <linux/iommu.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_prime.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 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_put(&obj->gem);
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}
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/* XXX move this into lib/scatterlist.c? */
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static int sg_alloc_table_from_sg(struct sg_table *sgt, struct scatterlist *sg,
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unsigned int nents, gfp_t gfp_mask)
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{
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struct scatterlist *dst;
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unsigned int i;
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int err;
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err = sg_alloc_table(sgt, nents, gfp_mask);
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if (err < 0)
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return err;
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dst = sgt->sgl;
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for (i = 0; i < nents; i++) {
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sg_set_page(dst, sg_page(sg), sg->length, 0);
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dst = sg_next(dst);
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sg = sg_next(sg);
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}
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return 0;
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}
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static struct sg_table *tegra_bo_pin(struct device *dev, struct host1x_bo *bo,
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dma_addr_t *phys)
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{
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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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struct sg_table *sgt;
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int err;
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/*
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* If we've manually mapped the buffer object through the IOMMU, make
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* sure to return the IOVA address of our mapping.
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*
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* Similarly, for buffers that have been allocated by the DMA API the
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* physical address can be used for devices that are not attached to
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* an IOMMU. For these devices, callers must pass a valid pointer via
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* the @phys argument.
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*
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* Imported buffers were also already mapped at import time, so the
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* existing mapping can be reused.
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*/
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if (phys) {
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*phys = obj->iova;
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return NULL;
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}
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/*
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* If we don't have a mapping for this buffer yet, return an SG table
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* so that host1x can do the mapping for us via the DMA API.
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*/
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sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return ERR_PTR(-ENOMEM);
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if (obj->pages) {
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/*
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* If the buffer object was allocated from the explicit IOMMU
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* API code paths, construct an SG table from the pages.
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*/
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err = sg_alloc_table_from_pages(sgt, obj->pages, obj->num_pages,
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0, obj->gem.size, GFP_KERNEL);
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if (err < 0)
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goto free;
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} else if (obj->sgt) {
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/*
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* If the buffer object already has an SG table but no pages
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* were allocated for it, it means the buffer was imported and
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* the SG table needs to be copied to avoid overwriting any
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* other potential users of the original SG table.
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*/
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err = sg_alloc_table_from_sg(sgt, obj->sgt->sgl, obj->sgt->nents,
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GFP_KERNEL);
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if (err < 0)
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goto free;
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} else {
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/*
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* If the buffer object had no pages allocated and if it was
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* not imported, it had to be allocated with the DMA API, so
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* the DMA API helper can be used.
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*/
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err = dma_get_sgtable(dev, sgt, obj->vaddr, obj->iova,
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obj->gem.size);
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if (err < 0)
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goto free;
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}
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return sgt;
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free:
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kfree(sgt);
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return ERR_PTR(err);
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}
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static void tegra_bo_unpin(struct device *dev, struct sg_table *sgt)
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{
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if (sgt) {
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sg_free_table(sgt);
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kfree(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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if (obj->vaddr)
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return obj->vaddr;
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else if (obj->gem.import_attach)
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return dma_buf_vmap(obj->gem.import_attach->dmabuf);
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else
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return vmap(obj->pages, obj->num_pages, VM_MAP,
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pgprot_writecombine(PAGE_KERNEL));
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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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struct tegra_bo *obj = host1x_to_tegra_bo(bo);
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if (obj->vaddr)
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return;
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else if (obj->gem.import_attach)
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dma_buf_vunmap(obj->gem.import_attach->dmabuf, addr);
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else
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vunmap(addr);
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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_get(&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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};
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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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int 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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mutex_lock(&tegra->mm_lock);
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err = drm_mm_insert_node_generic(&tegra->mm,
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bo->mm, bo->gem.size, PAGE_SIZE, 0, 0);
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if (err < 0) {
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dev_err(tegra->drm->dev, "out of I/O virtual memory: %d\n",
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err);
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goto unlock;
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}
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bo->iova = bo->mm->start;
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bo->size = iommu_map_sg(tegra->domain, bo->iova, bo->sgt->sgl,
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bo->sgt->nents, prot);
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if (!bo->size) {
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dev_err(tegra->drm->dev, "failed to map buffer\n");
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err = -ENOMEM;
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goto remove;
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}
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mutex_unlock(&tegra->mm_lock);
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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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unlock:
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mutex_unlock(&tegra->mm_lock);
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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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mutex_lock(&tegra->mm_lock);
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iommu_unmap(tegra->domain, bo->iova, bo->size);
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drm_mm_remove_node(bo->mm);
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mutex_unlock(&tegra->mm_lock);
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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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dma_unmap_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
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DMA_FROM_DEVICE);
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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->iova);
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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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int err;
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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->gem.dev, bo->pages, bo->num_pages);
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if (IS_ERR(bo->sgt)) {
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err = PTR_ERR(bo->sgt);
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goto put_pages;
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}
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err = dma_map_sg(drm->dev, bo->sgt->sgl, bo->sgt->nents,
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DMA_FROM_DEVICE);
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if (err == 0) {
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err = -EFAULT;
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goto free_sgt;
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}
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return 0;
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free_sgt:
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sg_free_table(bo->sgt);
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kfree(bo->sgt);
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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 err;
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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->iova,
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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_put(&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 (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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}
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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,
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&args->handle);
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if (IS_ERR(bo))
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return PTR_ERR(bo);
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return 0;
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}
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static vm_fault_t tegra_bo_fault(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct drm_gem_object *gem = vma->vm_private_data;
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struct tegra_bo *bo = to_tegra_bo(gem);
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struct page *page;
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pgoff_t offset;
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if (!bo->pages)
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return VM_FAULT_SIGBUS;
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offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
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page = bo->pages[offset];
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return vmf_insert_page(vma, vmf->address, page);
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}
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const struct vm_operations_struct tegra_bo_vm_ops = {
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.fault = tegra_bo_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma)
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{
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struct tegra_bo *bo = to_tegra_bo(gem);
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if (!bo->pages) {
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unsigned long vm_pgoff = vma->vm_pgoff;
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int err;
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/*
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* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(),
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* and set the vm_pgoff (used as a fake buffer offset by DRM)
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* to 0 as we want to map the whole buffer.
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*/
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_pgoff = 0;
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err = dma_mmap_wc(gem->dev->dev, vma, bo->vaddr, bo->iova,
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gem->size);
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if (err < 0) {
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drm_gem_vm_close(vma);
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return err;
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}
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vma->vm_pgoff = vm_pgoff;
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} else {
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pgprot_t prot = vm_get_page_prot(vma->vm_flags);
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vma->vm_flags |= VM_MIXEDMAP;
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_page_prot = pgprot_writecombine(prot);
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}
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return 0;
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}
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int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct drm_gem_object *gem;
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int err;
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|
|
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_sg(attach->dev, sgt->sgl, sgt->nents, 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_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 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_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
|
|
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_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
|
|
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 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,
|
|
.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;
|
|
}
|