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c67e62790f
Mapping the imported pages of a DMA-buf into an userspace process doesn't work as expected. But we have reoccurring requests on this approach, so split the functions for this and document that dma_buf_mmap() needs to be used instead. v2: split it into two functions v3: rebased on latest changes v4: update commit message a bit Signed-off-by: Christian König <christian.koenig@amd.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/403838/
287 lines
6.7 KiB
C
287 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015 MediaTek Inc.
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*/
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#include <linux/dma-buf.h>
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#include <drm/drm.h>
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#include <drm/drm_device.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_prime.h>
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#include "mtk_drm_drv.h"
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#include "mtk_drm_gem.h"
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static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
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.free = mtk_drm_gem_free_object,
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.get_sg_table = mtk_gem_prime_get_sg_table,
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.vmap = mtk_drm_gem_prime_vmap,
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.vunmap = mtk_drm_gem_prime_vunmap,
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.vm_ops = &drm_gem_cma_vm_ops,
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};
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static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev,
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unsigned long size)
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{
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struct mtk_drm_gem_obj *mtk_gem_obj;
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int ret;
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size = round_up(size, PAGE_SIZE);
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mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);
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if (!mtk_gem_obj)
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return ERR_PTR(-ENOMEM);
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mtk_gem_obj->base.funcs = &mtk_drm_gem_object_funcs;
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ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);
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if (ret < 0) {
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DRM_ERROR("failed to initialize gem object\n");
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kfree(mtk_gem_obj);
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return ERR_PTR(ret);
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}
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return mtk_gem_obj;
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}
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struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev,
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size_t size, bool alloc_kmap)
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{
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struct mtk_drm_private *priv = dev->dev_private;
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struct mtk_drm_gem_obj *mtk_gem;
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struct drm_gem_object *obj;
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int ret;
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mtk_gem = mtk_drm_gem_init(dev, size);
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if (IS_ERR(mtk_gem))
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return ERR_CAST(mtk_gem);
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obj = &mtk_gem->base;
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mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;
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if (!alloc_kmap)
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mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
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mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,
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&mtk_gem->dma_addr, GFP_KERNEL,
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mtk_gem->dma_attrs);
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if (!mtk_gem->cookie) {
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DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);
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ret = -ENOMEM;
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goto err_gem_free;
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}
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if (alloc_kmap)
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mtk_gem->kvaddr = mtk_gem->cookie;
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DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",
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mtk_gem->cookie, &mtk_gem->dma_addr,
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size);
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return mtk_gem;
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err_gem_free:
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drm_gem_object_release(obj);
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kfree(mtk_gem);
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return ERR_PTR(ret);
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}
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void mtk_drm_gem_free_object(struct drm_gem_object *obj)
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{
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struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
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struct mtk_drm_private *priv = obj->dev->dev_private;
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if (mtk_gem->sg)
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drm_prime_gem_destroy(obj, mtk_gem->sg);
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else
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dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,
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mtk_gem->dma_addr, mtk_gem->dma_attrs);
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/* release file pointer to gem object. */
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drm_gem_object_release(obj);
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kfree(mtk_gem);
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}
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int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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struct mtk_drm_gem_obj *mtk_gem;
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int ret;
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args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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args->size = args->pitch * args->height;
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mtk_gem = mtk_drm_gem_create(dev, args->size, false);
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if (IS_ERR(mtk_gem))
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return PTR_ERR(mtk_gem);
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/*
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* allocate a id of idr table where the obj is registered
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* and handle has the id what user can see.
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*/
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ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);
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if (ret)
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goto err_handle_create;
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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_put(&mtk_gem->base);
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return 0;
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err_handle_create:
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mtk_drm_gem_free_object(&mtk_gem->base);
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return ret;
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}
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static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
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struct vm_area_struct *vma)
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{
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int ret;
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struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
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struct mtk_drm_private *priv = obj->dev->dev_private;
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/*
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* dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
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* VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
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*/
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vma->vm_flags &= ~VM_PFNMAP;
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ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
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mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
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if (ret)
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drm_gem_vm_close(vma);
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return ret;
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}
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int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
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{
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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)
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return ret;
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return mtk_drm_gem_object_mmap(obj, vma);
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}
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int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_gem_object *obj;
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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obj = vma->vm_private_data;
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/*
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* Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
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* whole buffer from the start.
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*/
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vma->vm_pgoff = 0;
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return mtk_drm_gem_object_mmap(obj, vma);
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}
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/*
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* Allocate a sg_table for this GEM object.
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* Note: Both the table's contents, and the sg_table itself must be freed by
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* the caller.
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* Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.
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*/
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struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)
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{
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struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
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struct mtk_drm_private *priv = obj->dev->dev_private;
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struct sg_table *sgt;
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int ret;
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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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ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,
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mtk_gem->dma_addr, obj->size,
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mtk_gem->dma_attrs);
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if (ret) {
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DRM_ERROR("failed to allocate sgt, %d\n", ret);
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kfree(sgt);
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return ERR_PTR(ret);
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}
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return sgt;
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}
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struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach, struct sg_table *sg)
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{
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struct mtk_drm_gem_obj *mtk_gem;
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/* check if the entries in the sg_table are contiguous */
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if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {
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DRM_ERROR("sg_table is not contiguous");
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return ERR_PTR(-EINVAL);
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}
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mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
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if (IS_ERR(mtk_gem))
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return ERR_CAST(mtk_gem);
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mtk_gem->dma_addr = sg_dma_address(sg->sgl);
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mtk_gem->sg = sg;
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return &mtk_gem->base;
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}
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int mtk_drm_gem_prime_vmap(struct drm_gem_object *obj, struct dma_buf_map *map)
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{
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struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
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struct sg_table *sgt = NULL;
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unsigned int npages;
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if (mtk_gem->kvaddr)
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goto out;
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sgt = mtk_gem_prime_get_sg_table(obj);
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if (IS_ERR(sgt))
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return PTR_ERR(sgt);
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npages = obj->size >> PAGE_SHIFT;
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mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);
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if (!mtk_gem->pages) {
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kfree(sgt);
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return -ENOMEM;
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}
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drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);
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mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,
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pgprot_writecombine(PAGE_KERNEL));
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out:
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kfree(sgt);
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dma_buf_map_set_vaddr(map, mtk_gem->kvaddr);
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return 0;
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}
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void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, struct dma_buf_map *map)
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{
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struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
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void *vaddr = map->vaddr;
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if (!mtk_gem->pages)
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return;
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vunmap(vaddr);
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mtk_gem->kvaddr = 0;
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kfree(mtk_gem->pages);
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}
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