169 lines
4.1 KiB
C
169 lines
4.1 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "msm_drv.h"
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#include "msm_gem.h"
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#include <linux/dma-buf.h>
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#include <linux/ion.h>
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struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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int npages = obj->size >> PAGE_SHIFT;
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if (WARN_ON(!msm_obj->pages)) /* should have already pinned! */
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return NULL;
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return drm_prime_pages_to_sg(msm_obj->pages, npages);
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}
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void *msm_gem_prime_vmap(struct drm_gem_object *obj)
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{
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return msm_gem_get_vaddr(obj);
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}
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void msm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
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{
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msm_gem_put_vaddr(obj);
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}
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int msm_gem_prime_mmap(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 < 0)
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return ret;
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return msm_gem_mmap_obj(vma->vm_private_data, vma);
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}
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struct drm_gem_object *msm_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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return msm_gem_import(dev, attach->dmabuf, sg);
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}
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int msm_gem_prime_pin(struct drm_gem_object *obj)
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{
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if (!obj->import_attach)
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msm_gem_get_pages(obj);
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return 0;
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}
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void msm_gem_prime_unpin(struct drm_gem_object *obj)
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{
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if (!obj->import_attach)
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msm_gem_put_pages(obj);
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}
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struct reservation_object *msm_gem_prime_res_obj(struct drm_gem_object *obj)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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return msm_obj->resv;
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}
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struct drm_gem_object *msm_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf)
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{
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struct dma_buf_attachment *attach;
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struct sg_table *sgt = NULL;
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struct drm_gem_object *obj;
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struct device *attach_dev;
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unsigned long flags = 0;
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int ret;
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if (!dma_buf)
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return ERR_PTR(-EINVAL);
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if (dma_buf->priv && !dma_buf->ops->begin_cpu_access) {
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obj = dma_buf->priv;
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if (obj->dev == dev) {
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/*
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* Importing dmabuf exported from out own gem increases
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* refcount on gem itself instead of f_count of dmabuf.
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*/
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drm_gem_object_get(obj);
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return obj;
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}
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}
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if (!dev->driver->gem_prime_import_sg_table) {
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DRM_ERROR("NULL gem_prime_import_sg_table\n");
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return ERR_PTR(-EINVAL);
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}
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attach_dev = dev->dev;
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attach = dma_buf_attach(dma_buf, attach_dev);
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if (IS_ERR(attach)) {
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DRM_ERROR("dma_buf_attach failure, err=%ld\n", PTR_ERR(attach));
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return ERR_CAST(attach);
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}
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get_dma_buf(dma_buf);
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/*
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* For cached buffers where CPU access is required, dma_map_attachment
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* must be called now to allow user-space to perform cpu sync begin/end
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* otherwise do delayed mapping during the commit.
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*/
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ret = dma_buf_get_flags(dma_buf, &flags);
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if (ret) {
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DRM_ERROR("dma_buf_get_flags failure, err=%d\n", ret);
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goto fail_put;
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} else if (flags & ION_FLAG_CACHED) {
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attach->dma_map_attrs |= DMA_ATTR_DELAYED_UNMAP;
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sgt = dma_buf_map_attachment(
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attach, DMA_BIDIRECTIONAL);
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if (IS_ERR(sgt)) {
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ret = PTR_ERR(sgt);
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DRM_ERROR(
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"dma_buf_map_attachment failure, err=%d\n",
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ret);
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goto fail_detach;
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}
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}
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/*
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* If importing a NULL sg table (i.e. for uncached buffers),
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* create a drm gem object with only the dma buf attachment.
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*/
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obj = dev->driver->gem_prime_import_sg_table(dev, attach, sgt);
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if (IS_ERR(obj)) {
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ret = PTR_ERR(obj);
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DRM_ERROR("gem_prime_import_sg_table failure, err=%d\n", ret);
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goto fail_unmap;
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}
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obj->import_attach = attach;
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return obj;
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fail_unmap:
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if (sgt)
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dma_buf_unmap_attachment(attach, sgt, DMA_BIDIRECTIONAL);
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fail_detach:
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dma_buf_detach(dma_buf, attach);
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fail_put:
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dma_buf_put(dma_buf);
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return ERR_PTR(ret);
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}
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