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Petersen" , "daniel@iogearbox.net" , Dan Williams , "jack@suse.com" , Zhu Yanjun Subject: [RFC 14/16] vfio/mlx5: Convert vfio to use DMA link API Date: Tue, 5 Mar 2024 12:22:15 +0200 Message-ID: X-Mailer: git-send-email 2.44.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: F1C31A000F X-Rspam-User: X-Stat-Signature: oiu4ynq1ucsa58tt5xk9a796xpowyobi X-Rspamd-Server: rspam01 X-HE-Tag: 1709634205-129725 X-HE-Meta: U2FsdGVkX1+Etq99/fryFO6Bl/aHEYOpJ+bbzNu7k3qhuASR74v4m8jKEE3KFqsRIWxyFjg/rnyRPkEqKI0T+mTRx+87aR2wwU4XOsFLoYhxJK8TAEpSVn/nydAHQDBbp82F/irPmUL+Tv8fSbGPY8UxF9QaEmu42zq85SyK3cRWOikZvYZI3yDS4ucpQhRJ8K0Pfe/wR1d+ikXAFEX/QiJx/fIu2fnK5qyHq7Q35+70s6QqKq1OszXOP7mgdhNnEkpu/SVlMxcWrK6pWyglawfiv8MUDKS8AT6lH/PZHW2txQK3Lve3yoU7NlEr+Ispo3XTN4JPnMZd03Da+4+hFsW5OcwKAg9WhwvNeJ8Q6abpiO3ne0urvuMqc4y+n7Ix91nSj0sODGtB3Wp7y04PccFpg9m8fRKYcdTfYbX6vmKyjS9SoihDVwNcQfbb2VdX/1aii9A5iVvsM+8jFysh85xq6GAKn4CoJK5lU1LlDY1amjTv9vcqahCsNrH8EKCc8Jr1B0xlFrMgC80V0rDdTJ/098JCgvdikuxPKydwI8ul5j7oN3aqbG3X4sbhN6UkK6FVFZ5T91SJaKfJS7X1DjzYIgsBLcK295owVHCKbJG5y4YWqNwicQSbRO53RqtWrdtGg0cOxj3u9y0VctGPITlbEUEiTh/HvglJuZqv2zHYVsV1sPh6d3VmA+dMyL0R2zFRgLRJZ8fBHpCROoAFoPMPgaAIarypfaY+tuO3yPT2/H/XcD+3+1jE791dkmL7DUwg0ErpvDSWxVrPlVCNwuyyc7pnG5qZgWXN5HGXfcZzYUvPMLUTEOwve4yXjjIhAN0mTqv0dAtNyTK5Tc6SKGBKidfMZM3vrKCYZt1a/LSbUr6cNjY9GJBdssGYWqoRlfNRy9UeIAqNUiQTj7LaBfDZOow8qpf8g7Eaezs2PkZT2ktSSCbQkuxBJZ076FY1dq8BtT/M341ti9rdCPC +Gg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Message-ID: <20240305102215.Z0s8xBgshP43dMWiP-ICmmT0_sa7PXBFgb9tZYL4k9Y@z> From: Leon Romanovsky Remove intermediate scatter-gather table as it is not needed if DMA link API is used. This conversion reduces drastically the memory used to manage that table. Signed-off-by: Leon Romanovsky --- drivers/vfio/pci/mlx5/cmd.c | 177 ++++++++++++++++------------------- drivers/vfio/pci/mlx5/cmd.h | 8 +- drivers/vfio/pci/mlx5/main.c | 50 ++-------- 3 files changed, 91 insertions(+), 144 deletions(-) diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c index 5e2103042d9b..cfae03f7b7da 100644 --- a/drivers/vfio/pci/mlx5/cmd.c +++ b/drivers/vfio/pci/mlx5/cmd.c @@ -332,26 +332,60 @@ static u32 *alloc_mkey_in(u32 npages, u32 pdn) return in; } -static int create_mkey(struct mlx5_core_dev *mdev, u32 npages, - struct mlx5_vhca_data_buffer *buf, u32 *mkey_in, +static int create_mkey(struct mlx5_core_dev *mdev, u32 npages, u32 *mkey_in, u32 *mkey) { + int inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + + sizeof(__be64) * round_up(npages, 2); + + return mlx5_core_create_mkey(mdev, mkey, mkey_in, inlen); +} + +static void unregister_dma_pages(struct mlx5_core_dev *mdev, u32 npages, + u32 *mkey_in, struct dma_iova_attrs *iova) +{ + dma_addr_t addr; __be64 *mtt; - int inlen; + int i; mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); - if (buf) { - struct sg_dma_page_iter dma_iter; + for (i = npages - 1; i >= 0; i--) { + addr = be64_to_cpu(mtt[i]); + dma_unlink_range(iova, addr); + } + dma_free_iova(iova); +} + +static int register_dma_pages(struct mlx5_core_dev *mdev, u32 npages, + struct page **page_list, u32 *mkey_in, + struct dma_iova_attrs *iova) +{ + dma_addr_t addr; + __be64 *mtt; + int i, err; + + iova->dev = mdev->device; + iova->size = npages * PAGE_SIZE; + err = dma_alloc_iova(iova); + if (err) + return err; + + mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); + + for (i = 0; i < npages; i++) { + addr = dma_link_range(page_list[i], 0, iova, i * PAGE_SIZE); + if (dma_mapping_error(mdev->device, addr)) + goto error; - for_each_sgtable_dma_page(&buf->table.sgt, &dma_iter, 0) - *mtt++ = cpu_to_be64(sg_page_iter_dma_address(&dma_iter)); + *mtt++ = cpu_to_be64(addr); } - inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + - sizeof(__be64) * round_up(npages, 2); + return 0; - return mlx5_core_create_mkey(mdev, mkey, mkey_in, inlen); +error: + unregister_dma_pages(mdev, i, mkey_in, iova); + return -ENOMEM; } static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) @@ -367,17 +401,16 @@ static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) if (buf->dmaed || !buf->npages) return -EINVAL; - ret = dma_map_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0); - if (ret) - return ret; - buf->mkey_in = alloc_mkey_in(buf->npages, buf->migf->pdn); - if (!buf->mkey_in) { - ret = -ENOMEM; - goto err; - } + if (!buf->mkey_in) + return -ENOMEM; + + ret = register_dma_pages(mdev, buf->npages, buf->page_list, + buf->mkey_in, &buf->iova); + if (ret) + goto err_register_dma; - ret = create_mkey(mdev, buf->npages, buf, buf->mkey_in, &buf->mkey); + ret = create_mkey(mdev, buf->npages, buf->mkey_in, &buf->mkey); if (ret) goto err_create_mkey; @@ -386,32 +419,39 @@ static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) return 0; err_create_mkey: + unregister_dma_pages(mdev, buf->npages, buf->mkey_in, &buf->iova); +err_register_dma: kvfree(buf->mkey_in); -err: - dma_unmap_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0); return ret; } +static void free_page_list(u32 npages, struct page **page_list) +{ + int i; + + /* Undo alloc_pages_bulk_array() */ + for (i = npages - 1; i >= 0; i--) + __free_page(page_list[i]); + + kvfree(page_list); +} + void mlx5vf_free_data_buffer(struct mlx5_vhca_data_buffer *buf) { - struct mlx5_vf_migration_file *migf = buf->migf; - struct sg_page_iter sg_iter; + struct mlx5vf_pci_core_device *mvdev = buf->migf->mvdev; + struct mlx5_core_dev *mdev = mvdev->mdev; - lockdep_assert_held(&migf->mvdev->state_mutex); - WARN_ON(migf->mvdev->mdev_detach); + lockdep_assert_held(&mvdev->state_mutex); + WARN_ON(mvdev->mdev_detach); if (buf->dmaed) { - mlx5_core_destroy_mkey(migf->mvdev->mdev, buf->mkey); + mlx5_core_destroy_mkey(mdev, buf->mkey); + unregister_dma_pages(mdev, buf->npages, buf->mkey_in, + &buf->iova); kvfree(buf->mkey_in); - dma_unmap_sgtable(migf->mvdev->mdev->device, &buf->table.sgt, - buf->dma_dir, 0); } - /* Undo alloc_pages_bulk_array() */ - for_each_sgtable_page(&buf->table.sgt, &sg_iter, 0) - __free_page(sg_page_iter_page(&sg_iter)); - sg_free_append_table(&buf->table); - kvfree(buf->page_list); + free_page_list(buf->npages, buf->page_list); kfree(buf); } @@ -426,7 +466,7 @@ mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, if (!buf) return ERR_PTR(-ENOMEM); - buf->dma_dir = dma_dir; + buf->iova.dir = dma_dir; buf->migf = migf; if (npages) { ret = mlx5vf_add_migration_pages(buf, npages); @@ -469,7 +509,7 @@ mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, spin_lock_irq(&migf->list_lock); list_for_each_entry_safe(buf, temp_buf, &migf->avail_list, buf_elm) { - if (buf->dma_dir == dma_dir) { + if (buf->iova.dir == dma_dir) { list_del_init(&buf->buf_elm); if (buf->npages >= npages) { spin_unlock_irq(&migf->list_lock); @@ -1253,17 +1293,6 @@ static void mlx5vf_destroy_qp(struct mlx5_core_dev *mdev, kfree(qp); } -static void free_recv_pages(struct mlx5_vhca_recv_buf *recv_buf) -{ - int i; - - /* Undo alloc_pages_bulk_array() */ - for (i = 0; i < recv_buf->npages; i++) - __free_page(recv_buf->page_list[i]); - - kvfree(recv_buf->page_list); -} - static int alloc_recv_pages(struct mlx5_vhca_recv_buf *recv_buf, unsigned int npages) { @@ -1300,56 +1329,16 @@ static int alloc_recv_pages(struct mlx5_vhca_recv_buf *recv_buf, return -ENOMEM; } -static void unregister_dma_pages(struct mlx5_core_dev *mdev, u32 npages, - u32 *mkey_in) -{ - dma_addr_t addr; - __be64 *mtt; - int i; - - mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); - - for (i = npages - 1; i >= 0; i--) { - addr = be64_to_cpu(mtt[i]); - dma_unmap_single(mdev->device, addr, PAGE_SIZE, - DMA_FROM_DEVICE); - } -} - -static int register_dma_pages(struct mlx5_core_dev *mdev, u32 npages, - struct page **page_list, u32 *mkey_in) -{ - dma_addr_t addr; - __be64 *mtt; - int i; - - mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); - - for (i = 0; i < npages; i++) { - addr = dma_map_page(mdev->device, page_list[i], 0, PAGE_SIZE, - DMA_FROM_DEVICE); - if (dma_mapping_error(mdev->device, addr)) - goto error; - - *mtt++ = cpu_to_be64(addr); - } - - return 0; - -error: - unregister_dma_pages(mdev, i, mkey_in); - return -ENOMEM; -} - static void mlx5vf_free_qp_recv_resources(struct mlx5_core_dev *mdev, struct mlx5_vhca_qp *qp) { struct mlx5_vhca_recv_buf *recv_buf = &qp->recv_buf; mlx5_core_destroy_mkey(mdev, recv_buf->mkey); - unregister_dma_pages(mdev, recv_buf->npages, recv_buf->mkey_in); + unregister_dma_pages(mdev, recv_buf->npages, recv_buf->mkey_in, + &recv_buf->iova); kvfree(recv_buf->mkey_in); - free_recv_pages(&qp->recv_buf); + free_page_list(recv_buf->npages, recv_buf->page_list); } static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev, @@ -1370,24 +1359,24 @@ static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev, goto end; } + recv_buf->iova.dir = DMA_FROM_DEVICE; err = register_dma_pages(mdev, npages, recv_buf->page_list, - recv_buf->mkey_in); + recv_buf->mkey_in, &recv_buf->iova); if (err) goto err_register_dma; - err = create_mkey(mdev, npages, NULL, recv_buf->mkey_in, - &recv_buf->mkey); + err = create_mkey(mdev, npages, recv_buf->mkey_in, &recv_buf->mkey); if (err) goto err_create_mkey; return 0; err_create_mkey: - unregister_dma_pages(mdev, npages, recv_buf->mkey_in); + unregister_dma_pages(mdev, npages, recv_buf->mkey_in, &recv_buf->iova); err_register_dma: kvfree(recv_buf->mkey_in); end: - free_recv_pages(recv_buf); + free_page_list(npages, recv_buf->page_list); return err; } diff --git a/drivers/vfio/pci/mlx5/cmd.h b/drivers/vfio/pci/mlx5/cmd.h index 815fcb54494d..3a046166d9f2 100644 --- a/drivers/vfio/pci/mlx5/cmd.h +++ b/drivers/vfio/pci/mlx5/cmd.h @@ -57,22 +57,17 @@ struct mlx5_vf_migration_header { }; struct mlx5_vhca_data_buffer { + struct dma_iova_attrs iova; struct page **page_list; - struct sg_append_table table; loff_t start_pos; u64 length; u32 npages; u32 mkey; u32 *mkey_in; - enum dma_data_direction dma_dir; u8 dmaed:1; u8 stop_copy_chunk_num; struct list_head buf_elm; struct mlx5_vf_migration_file *migf; - /* Optimize mlx5vf_get_migration_page() for sequential access */ - struct scatterlist *last_offset_sg; - unsigned int sg_last_entry; - unsigned long last_offset; }; struct mlx5vf_async_data { @@ -137,6 +132,7 @@ struct mlx5_vhca_cq { }; struct mlx5_vhca_recv_buf { + struct dma_iova_attrs iova; u32 npages; struct page **page_list; u32 next_rq_offset; diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index 7ffe24693a55..668c28bc429c 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -34,35 +34,10 @@ static struct mlx5vf_pci_core_device *mlx5vf_drvdata(struct pci_dev *pdev) core_device); } -struct page * -mlx5vf_get_migration_page(struct mlx5_vhca_data_buffer *buf, - unsigned long offset) +struct page *mlx5vf_get_migration_page(struct mlx5_vhca_data_buffer *buf, + unsigned long offset) { - unsigned long cur_offset = 0; - struct scatterlist *sg; - unsigned int i; - - /* All accesses are sequential */ - if (offset < buf->last_offset || !buf->last_offset_sg) { - buf->last_offset = 0; - buf->last_offset_sg = buf->table.sgt.sgl; - buf->sg_last_entry = 0; - } - - cur_offset = buf->last_offset; - - for_each_sg(buf->last_offset_sg, sg, - buf->table.sgt.orig_nents - buf->sg_last_entry, i) { - if (offset < sg->length + cur_offset) { - buf->last_offset_sg = sg; - buf->sg_last_entry += i; - buf->last_offset = cur_offset; - return nth_page(sg_page(sg), - (offset - cur_offset) / PAGE_SIZE); - } - cur_offset += sg->length; - } - return NULL; + return buf->page_list[offset / PAGE_SIZE]; } int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, @@ -72,13 +47,9 @@ int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, size_t old_size, new_size; struct page **page_list; unsigned long filled; - unsigned int to_fill; - int ret; - to_fill = min_t(unsigned int, npages, - PAGE_SIZE / sizeof(*buf->page_list)); old_size = buf->npages * sizeof(*buf->page_list); - new_size = old_size + to_fill * sizeof(*buf->page_list); + new_size = old_size + to_alloc * sizeof(*buf->page_list); page_list = kvrealloc(buf->page_list, old_size, new_size, GFP_KERNEL_ACCOUNT | __GFP_ZERO); if (!page_list) @@ -87,22 +58,13 @@ int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, buf->page_list = page_list; do { - filled = alloc_pages_bulk_array(GFP_KERNEL_ACCOUNT, to_fill, + filled = alloc_pages_bulk_array(GFP_KERNEL_ACCOUNT, to_alloc, buf->page_list + buf->npages); if (!filled) return -ENOMEM; to_alloc -= filled; - ret = sg_alloc_append_table_from_pages( - &buf->table, buf->page_list + buf->npages, filled, 0, - filled << PAGE_SHIFT, UINT_MAX, SG_MAX_SINGLE_ALLOC, - GFP_KERNEL_ACCOUNT); - if (ret) - return ret; - buf->npages += filled; - to_fill = min_t(unsigned int, to_alloc, - PAGE_SIZE / sizeof(*buf->page_list)); } while (to_alloc > 0); return 0; @@ -164,7 +126,7 @@ static void mlx5vf_buf_read_done(struct mlx5_vhca_data_buffer *vhca_buf) struct mlx5_vf_migration_file *migf = vhca_buf->migf; if (vhca_buf->stop_copy_chunk_num) { - bool is_header = vhca_buf->dma_dir == DMA_NONE; + bool is_header = vhca_buf->iova.dir == DMA_NONE; u8 chunk_num = vhca_buf->stop_copy_chunk_num; size_t next_required_umem_size = 0; -- 2.44.0