143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2014-2018 Etnaviv Project
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*/
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#include <drm/drm_prime.h>
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#include <linux/dma-buf.h>
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#include "etnaviv_drv.h"
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#include "etnaviv_gem.h"
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static struct lock_class_key etnaviv_prime_lock_class;
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struct sg_table *etnaviv_gem_prime_get_sg_table(struct drm_gem_object *obj)
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{
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struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
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int npages = obj->size >> PAGE_SHIFT;
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if (WARN_ON(!etnaviv_obj->pages)) /* should have already pinned! */
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return ERR_PTR(-EINVAL);
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return drm_prime_pages_to_sg(etnaviv_obj->pages, npages);
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}
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void *etnaviv_gem_prime_vmap(struct drm_gem_object *obj)
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{
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return etnaviv_gem_vmap(obj);
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}
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void etnaviv_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
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{
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/* TODO msm_gem_vunmap() */
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}
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int etnaviv_gem_prime_mmap(struct drm_gem_object *obj,
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struct vm_area_struct *vma)
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{
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struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
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int ret;
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ret = drm_gem_mmap_obj(obj, obj->size, vma);
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if (ret < 0)
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return ret;
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return etnaviv_obj->ops->mmap(etnaviv_obj, vma);
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}
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int etnaviv_gem_prime_pin(struct drm_gem_object *obj)
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{
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if (!obj->import_attach) {
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struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
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mutex_lock(&etnaviv_obj->lock);
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etnaviv_gem_get_pages(etnaviv_obj);
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mutex_unlock(&etnaviv_obj->lock);
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}
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return 0;
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}
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void etnaviv_gem_prime_unpin(struct drm_gem_object *obj)
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{
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if (!obj->import_attach) {
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struct etnaviv_gem_object *etnaviv_obj = to_etnaviv_bo(obj);
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mutex_lock(&etnaviv_obj->lock);
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etnaviv_gem_put_pages(to_etnaviv_bo(obj));
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mutex_unlock(&etnaviv_obj->lock);
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}
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}
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static void etnaviv_gem_prime_release(struct etnaviv_gem_object *etnaviv_obj)
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{
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if (etnaviv_obj->vaddr)
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dma_buf_vunmap(etnaviv_obj->base.import_attach->dmabuf,
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etnaviv_obj->vaddr);
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/* Don't drop the pages for imported dmabuf, as they are not
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* ours, just free the array we allocated:
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*/
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if (etnaviv_obj->pages)
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kvfree(etnaviv_obj->pages);
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drm_prime_gem_destroy(&etnaviv_obj->base, etnaviv_obj->sgt);
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}
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static void *etnaviv_gem_prime_vmap_impl(struct etnaviv_gem_object *etnaviv_obj)
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{
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lockdep_assert_held(&etnaviv_obj->lock);
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return dma_buf_vmap(etnaviv_obj->base.import_attach->dmabuf);
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}
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static int etnaviv_gem_prime_mmap_obj(struct etnaviv_gem_object *etnaviv_obj,
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struct vm_area_struct *vma)
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{
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return dma_buf_mmap(etnaviv_obj->base.dma_buf, vma, 0);
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}
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static const struct etnaviv_gem_ops etnaviv_gem_prime_ops = {
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/* .get_pages should never be called */
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.release = etnaviv_gem_prime_release,
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.vmap = etnaviv_gem_prime_vmap_impl,
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.mmap = etnaviv_gem_prime_mmap_obj,
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};
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struct drm_gem_object *etnaviv_gem_prime_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach, struct sg_table *sgt)
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{
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struct etnaviv_gem_object *etnaviv_obj;
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size_t size = PAGE_ALIGN(attach->dmabuf->size);
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int ret, npages;
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ret = etnaviv_gem_new_private(dev, size, ETNA_BO_WC,
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&etnaviv_gem_prime_ops, &etnaviv_obj);
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if (ret < 0)
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return ERR_PTR(ret);
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lockdep_set_class(&etnaviv_obj->lock, &etnaviv_prime_lock_class);
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npages = size / PAGE_SIZE;
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etnaviv_obj->sgt = sgt;
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etnaviv_obj->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
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if (!etnaviv_obj->pages) {
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ret = -ENOMEM;
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goto fail;
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}
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ret = drm_prime_sg_to_page_addr_arrays(sgt, etnaviv_obj->pages,
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NULL, npages);
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if (ret)
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goto fail;
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etnaviv_gem_obj_add(dev, &etnaviv_obj->base);
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return &etnaviv_obj->base;
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fail:
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drm_gem_object_put_unlocked(&etnaviv_obj->base);
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return ERR_PTR(ret);
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}
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