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79fbd3e124
This allows using the normal sg_table APIs and makes all the code cleaner. Remove sgt, nents and nmapd from ib_umem. Link: https://lore.kernel.org/r/20210824142531.3877007-4-maorg@nvidia.com Signed-off-by: Maor Gottlieb <maorg@nvidia.com> Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
178 lines
4.3 KiB
C
178 lines
4.3 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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/*
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* Copyright (c) 2020 Intel Corporation. All rights reserved.
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*/
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#include <linux/dma-buf.h>
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#include <linux/dma-resv.h>
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#include <linux/dma-mapping.h>
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#include "uverbs.h"
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int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
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{
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struct sg_table *sgt;
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struct scatterlist *sg;
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struct dma_fence *fence;
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unsigned long start, end, cur = 0;
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unsigned int nmap = 0;
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int i;
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dma_resv_assert_held(umem_dmabuf->attach->dmabuf->resv);
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if (umem_dmabuf->sgt)
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goto wait_fence;
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sgt = dma_buf_map_attachment(umem_dmabuf->attach, DMA_BIDIRECTIONAL);
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if (IS_ERR(sgt))
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return PTR_ERR(sgt);
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/* modify the sg list in-place to match umem address and length */
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start = ALIGN_DOWN(umem_dmabuf->umem.address, PAGE_SIZE);
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end = ALIGN(umem_dmabuf->umem.address + umem_dmabuf->umem.length,
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PAGE_SIZE);
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for_each_sgtable_dma_sg(sgt, sg, i) {
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if (start < cur + sg_dma_len(sg) && cur < end)
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nmap++;
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if (cur <= start && start < cur + sg_dma_len(sg)) {
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unsigned long offset = start - cur;
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umem_dmabuf->first_sg = sg;
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umem_dmabuf->first_sg_offset = offset;
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sg_dma_address(sg) += offset;
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sg_dma_len(sg) -= offset;
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cur += offset;
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}
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if (cur < end && end <= cur + sg_dma_len(sg)) {
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unsigned long trim = cur + sg_dma_len(sg) - end;
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umem_dmabuf->last_sg = sg;
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umem_dmabuf->last_sg_trim = trim;
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sg_dma_len(sg) -= trim;
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break;
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}
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cur += sg_dma_len(sg);
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}
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umem_dmabuf->umem.sgt_append.sgt.sgl = umem_dmabuf->first_sg;
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umem_dmabuf->umem.sgt_append.sgt.nents = nmap;
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umem_dmabuf->sgt = sgt;
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wait_fence:
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/*
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* Although the sg list is valid now, the content of the pages
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* may be not up-to-date. Wait for the exporter to finish
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* the migration.
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*/
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fence = dma_resv_excl_fence(umem_dmabuf->attach->dmabuf->resv);
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if (fence)
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return dma_fence_wait(fence, false);
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return 0;
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}
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EXPORT_SYMBOL(ib_umem_dmabuf_map_pages);
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void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf)
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{
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dma_resv_assert_held(umem_dmabuf->attach->dmabuf->resv);
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if (!umem_dmabuf->sgt)
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return;
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/* retore the original sg list */
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if (umem_dmabuf->first_sg) {
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sg_dma_address(umem_dmabuf->first_sg) -=
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umem_dmabuf->first_sg_offset;
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sg_dma_len(umem_dmabuf->first_sg) +=
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umem_dmabuf->first_sg_offset;
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umem_dmabuf->first_sg = NULL;
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umem_dmabuf->first_sg_offset = 0;
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}
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if (umem_dmabuf->last_sg) {
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sg_dma_len(umem_dmabuf->last_sg) +=
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umem_dmabuf->last_sg_trim;
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umem_dmabuf->last_sg = NULL;
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umem_dmabuf->last_sg_trim = 0;
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}
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dma_buf_unmap_attachment(umem_dmabuf->attach, umem_dmabuf->sgt,
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DMA_BIDIRECTIONAL);
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umem_dmabuf->sgt = NULL;
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}
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EXPORT_SYMBOL(ib_umem_dmabuf_unmap_pages);
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struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
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unsigned long offset, size_t size,
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int fd, int access,
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const struct dma_buf_attach_ops *ops)
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{
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struct dma_buf *dmabuf;
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struct ib_umem_dmabuf *umem_dmabuf;
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struct ib_umem *umem;
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unsigned long end;
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struct ib_umem_dmabuf *ret = ERR_PTR(-EINVAL);
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if (check_add_overflow(offset, (unsigned long)size, &end))
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return ret;
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if (unlikely(!ops || !ops->move_notify))
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return ret;
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dmabuf = dma_buf_get(fd);
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if (IS_ERR(dmabuf))
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return ERR_CAST(dmabuf);
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if (dmabuf->size < end)
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goto out_release_dmabuf;
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umem_dmabuf = kzalloc(sizeof(*umem_dmabuf), GFP_KERNEL);
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if (!umem_dmabuf) {
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ret = ERR_PTR(-ENOMEM);
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goto out_release_dmabuf;
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}
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umem = &umem_dmabuf->umem;
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umem->ibdev = device;
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umem->length = size;
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umem->address = offset;
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umem->writable = ib_access_writable(access);
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umem->is_dmabuf = 1;
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if (!ib_umem_num_pages(umem))
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goto out_free_umem;
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umem_dmabuf->attach = dma_buf_dynamic_attach(
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dmabuf,
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device->dma_device,
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ops,
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umem_dmabuf);
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if (IS_ERR(umem_dmabuf->attach)) {
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ret = ERR_CAST(umem_dmabuf->attach);
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goto out_free_umem;
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}
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return umem_dmabuf;
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out_free_umem:
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kfree(umem_dmabuf);
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out_release_dmabuf:
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dma_buf_put(dmabuf);
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return ret;
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}
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EXPORT_SYMBOL(ib_umem_dmabuf_get);
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void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf)
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{
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struct dma_buf *dmabuf = umem_dmabuf->attach->dmabuf;
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dma_resv_lock(dmabuf->resv, NULL);
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ib_umem_dmabuf_unmap_pages(umem_dmabuf);
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dma_resv_unlock(dmabuf->resv);
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dma_buf_detach(dmabuf, umem_dmabuf->attach);
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dma_buf_put(dmabuf);
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kfree(umem_dmabuf);
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}
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