From patchwork Thu Sep 12 11:15:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13802015 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E04451BC9F8; Thu, 12 Sep 2024 11:17:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139830; cv=none; b=LdalVTTN/SkezhSAKz+AFCRw38bSB3y5wriN6r9hfZfmULvPUmJJT/xGFFVnPcAlxk7U2u5kzIpvHVJrimf6G0rEZTjQQQsuQTOH0PEd4xB8LIve8ZWeru9ub0sAp4QuXcz8Q2kOTljJuw2N45X3cu9cXw+DCvR8ZThPpIPDnBI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139830; c=relaxed/simple; bh=Dk4iS9NnVthuwT4fk3pwSykLGjgnL3XiLR0Yj7fW2pg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=J9TJMRWYcn/wOooOVn40h6rFwsAVANyXYcjnWcys362WMAQXXFqkLqN7/y6AAWUGUF7oF2Yhpxk9LiX+o03w7NB74Hm6RUzD09p0vIJUp2XbyF8d5oTQlt0ViafbhL/MTeL1Z9HGSKRx189D9f/BvlwJrK3LnPHXf21jdXL7Pkw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kjpRjm1h; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kjpRjm1h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE28CC4CEC3; Thu, 12 Sep 2024 11:17:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726139829; bh=Dk4iS9NnVthuwT4fk3pwSykLGjgnL3XiLR0Yj7fW2pg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kjpRjm1h2bUvRuIExn5ie51IkI7Jm6dqok5PQoPIBdaKTiScuVj9poh0E5VihqlwL JjaQ3GvVH6eIHFREycnTcfFnR8B5WdUisaTBpXd95amUmnXD6U/VBhBmxrOCXvWbD/ 6VZ+PGdVF+TBqen+57t389GmQ2RDNqfz8l3I/lRG44jgVUlAaTyuO2vAXzLUl++RsP IaiugOGUZp1xGgxLVQFtR+MfHUzhg/N4H6zHKemVyqeb6wLciiRIG9IIgIwv3tWa++ P5dgq3KrKQkx0UkFhXCgHL+QUWnncEyB/uwrBtULY/llel3bfOUIKmAh2lBllYM+3R 2ozmZrOHNHgmg== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , Christoph Hellwig , "Zeng, Oak" , Chaitanya Kulkarni Cc: Leon Romanovsky , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: [RFC v2 17/21] vfio/mlx5: Convert vfio to use DMA link API Date: Thu, 12 Sep 2024 14:15:52 +0300 Message-ID: <6369f834edd1e1144fbe11fd4b3aed3f63e33ade.1726138681.git.leon@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 | 211 ++++++++++++++++++----------------- drivers/vfio/pci/mlx5/cmd.h | 8 +- drivers/vfio/pci/mlx5/main.c | 33 +----- 3 files changed, 112 insertions(+), 140 deletions(-) diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c index 34ae3e299a9e..aa2f1ec326c0 100644 --- a/drivers/vfio/pci/mlx5/cmd.c +++ b/drivers/vfio/pci/mlx5/cmd.c @@ -345,25 +345,78 @@ 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_state *state) +{ + 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; + WARN_ON_ONCE(state->dir == DMA_NONE); - for_each_sgtable_dma_page(&buf->table.sgt, &dma_iter, 0) - *mtt++ = cpu_to_be64(sg_page_iter_dma_address(&dma_iter)); + if (state->use_iova) { + dma_unlink_range(state); + } else { + 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_page(state->dev, addr, PAGE_SIZE, state->dir); + } } + dma_free_iova(state); +} - inlen = MLX5_ST_SZ_BYTES(create_mkey_in) + - sizeof(__be64) * round_up(npages, 2); +static int register_dma_pages(struct mlx5_core_dev *mdev, u32 npages, + struct page **page_list, u32 *mkey_in, + struct dma_iova_state *state) +{ + dma_addr_t addr; + __be64 *mtt; + int i, err; - return mlx5_core_create_mkey(mdev, mkey, mkey_in, inlen); + WARN_ON_ONCE(state->dir == DMA_NONE); + + err = dma_alloc_iova(state, npages * PAGE_SIZE); + if (err) + return err; + + dma_set_iova_state(state, page_list[0], PAGE_SIZE); + + mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt); + err = dma_start_range(state); + if (err) { + dma_free_iova(state); + return err; + } + for (i = 0; i < npages; i++) { + if (state->use_iova) + addr = dma_link_range(state, page_to_phys(page_list[i]), + PAGE_SIZE); + else + addr = dma_map_page(mdev->device, page_list[i], 0, + PAGE_SIZE, state->dir); + err = dma_mapping_error(mdev->device, addr); + if (err) + goto error; + *mtt++ = cpu_to_be64(addr); + } + dma_end_range(state); + + return 0; + +error: + unregister_dma_pages(mdev, i, mkey_in, state); + return err; } static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) @@ -379,50 +432,56 @@ static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) if (buf->mkey_in || !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 = create_mkey(mdev, buf->npages, buf, buf->mkey_in, &buf->mkey); + ret = register_dma_pages(mdev, buf->npages, buf->page_list, + buf->mkey_in, &buf->state); + if (ret) + goto err_register_dma; + + ret = create_mkey(mdev, buf->npages, buf->mkey_in, &buf->mkey); if (ret) goto err_create_mkey; return 0; err_create_mkey: + unregister_dma_pages(mdev, buf->npages, buf->mkey_in, &buf->state); +err_register_dma: kvfree(buf->mkey_in); buf->mkey_in = NULL; -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->mkey_in) { - 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->state); 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); } @@ -433,7 +492,6 @@ static int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, 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)); page_list = kvzalloc(to_fill * sizeof(*buf->page_list), GFP_KERNEL_ACCOUNT); @@ -443,22 +501,13 @@ static 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, - buf->page_list + buf->npages); + 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; @@ -468,6 +517,7 @@ struct mlx5_vhca_data_buffer * mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, enum dma_data_direction dma_dir) { + struct mlx5_core_dev *mdev = migf->mvdev->mdev; struct mlx5_vhca_data_buffer *buf; int ret; @@ -475,7 +525,7 @@ mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, if (!buf) return ERR_PTR(-ENOMEM); - buf->dma_dir = dma_dir; + dma_init_iova_state(&buf->state, mdev->device, dma_dir); buf->migf = migf; if (npages) { ret = mlx5vf_add_migration_pages(buf, npages); @@ -518,7 +568,7 @@ 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->state.dir == dma_dir) { list_del_init(&buf->buf_elm); if (buf->npages >= npages) { spin_unlock_irq(&migf->list_lock); @@ -1340,17 +1390,6 @@ 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) { @@ -1386,45 +1425,6 @@ static int alloc_recv_pages(struct mlx5_vhca_recv_buf *recv_buf, kvfree(recv_buf->page_list); 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) @@ -1432,9 +1432,10 @@ static void mlx5vf_free_qp_recv_resources(struct mlx5_core_dev *mdev, 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->state); 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, @@ -1455,25 +1456,25 @@ static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev, goto end; } + recv_buf->state.dir = DMA_FROM_DEVICE; err = register_dma_pages(mdev, npages, recv_buf->page_list, - recv_buf->mkey_in); + recv_buf->mkey_in, &recv_buf->state); 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->state); err_register_dma: kvfree(recv_buf->mkey_in); recv_buf->mkey_in = NULL; 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 5b764199db53..8b0cd0ee11a0 100644 --- a/drivers/vfio/pci/mlx5/cmd.h +++ b/drivers/vfio/pci/mlx5/cmd.h @@ -54,20 +54,15 @@ struct mlx5_vf_migration_header { struct mlx5_vhca_data_buffer { struct page **page_list; - struct sg_append_table table; + struct dma_iova_state state; loff_t start_pos; u64 length; u32 npages; u32 mkey; u32 *mkey_in; - enum dma_data_direction dma_dir; 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 { @@ -134,6 +129,7 @@ struct mlx5_vhca_cq { struct mlx5_vhca_recv_buf { u32 npages; struct page **page_list; + struct dma_iova_state state; u32 next_rq_offset; u32 *mkey_in; u32 mkey; diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index d899cd499e27..f395b526e0ef 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]; } static void mlx5vf_disable_fd(struct mlx5_vf_migration_file *migf) @@ -121,7 +96,7 @@ 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->state.dir == DMA_NONE; u8 chunk_num = vhca_buf->stop_copy_chunk_num; size_t next_required_umem_size = 0;