From patchwork Thu Sep 12 11:15:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13802012 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 DC4951B984C; Thu, 12 Sep 2024 11:16:57 +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=1726139818; cv=none; b=QaiYq78kqUjnxmFn3QX408STIsA6BVyxG6tsEsSqcz5HdE1wh3+ISD53zdrfcYgfY4lLhk4YgVKhZ7QMsUdBWrhaU5PdUDPBj35e8F1eru7IJbhI8nPjJNpfzS+2G07K8zlJZ6BCp6gMBRE7AdS7pkpBzFiqCcqt9DJshutiHXM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139818; c=relaxed/simple; bh=cC5WVFVLsV04Ng3PmoGLp8oMvNfM8af8nEIAZfXZFwM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LwSnHxmXmPhUsAo+qJZpIVGOLz1KROEx66MQ1xp4zFa8kdW9XYLdKTpGZfyxfHhYa06rVyynNV3vroobBGG262GOym6nmTJ0gdjQL3e5aYcNW2ZhoH3r18TT/zK+7Tpo/OFT89ujfRRfyrfvhiV1uUKlq5pZG9dCfPXIAfuSWbE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XgkpL9dA; 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="XgkpL9dA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC6DBC4CECC; Thu, 12 Sep 2024 11:16:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726139817; bh=cC5WVFVLsV04Ng3PmoGLp8oMvNfM8af8nEIAZfXZFwM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XgkpL9dAYw9R+tD+B3UEjGJFrVUvX1Xw+6lm2MrJQdQ2r7jtbxTWS059rlVncbbDM viAybphzEL6aZfdX67tx5qN60zahQm9sodxMVAdLuwJHQ4ZhAeHc+9lT0hho9L0Zt+ oBpgO08eoYR/nGGJg1qmcUPLU0/xHQhWvv8YK/+2OtKG7b/OMqTL43zYry+FPFQG+8 2tTdF4FeAPzQ2hPkC3ThKVPLEiaC0HCnSFhHkI1r8he/ZWRnHohIbxSBimVMY4w8VD xwP/4P1UVs4oknIzlIhf86d8YFOU8zNkaFWhwj+ZYMfzr8KOFF/pS3cyUpgyn6p2As QR+JcJ1RifusQ== 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 14/21] vfio/mlx5: Explicitly use number of pages instead of allocated length Date: Thu, 12 Sep 2024 14:15:49 +0300 Message-ID: <29dea17e8e4dbbd839f14d3b248f5f3d06d251fa.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 allocated_length is a multiple of page size and number of pages, so let's change the functions to accept number of pages. It opens us a venue to combine receive and send paths together with code readability improvement. Signed-off-by: Leon Romanovsky --- drivers/vfio/pci/mlx5/cmd.c | 32 ++++++++++----------- drivers/vfio/pci/mlx5/cmd.h | 10 +++---- drivers/vfio/pci/mlx5/main.c | 56 +++++++++++++++++++++++------------- 3 files changed, 57 insertions(+), 41 deletions(-) diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c index 41a4b0cf4297..fdc3e515741f 100644 --- a/drivers/vfio/pci/mlx5/cmd.c +++ b/drivers/vfio/pci/mlx5/cmd.c @@ -318,8 +318,7 @@ static int _create_mkey(struct mlx5_core_dev *mdev, u32 pdn, struct mlx5_vhca_recv_buf *recv_buf, u32 *mkey) { - size_t npages = buf ? DIV_ROUND_UP(buf->allocated_length, PAGE_SIZE) : - recv_buf->npages; + size_t npages = buf ? buf->npages : recv_buf->npages; int err = 0, inlen; __be64 *mtt; void *mkc; @@ -375,7 +374,7 @@ static int mlx5vf_dma_data_buffer(struct mlx5_vhca_data_buffer *buf) if (mvdev->mdev_detach) return -ENOTCONN; - if (buf->dmaed || !buf->allocated_length) + if (buf->dmaed || !buf->npages) return -EINVAL; ret = dma_map_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0); @@ -444,7 +443,7 @@ static int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, if (ret) goto err; - buf->allocated_length += filled * PAGE_SIZE; + buf->npages += filled; /* clean input for another bulk allocation */ memset(page_list, 0, filled * sizeof(*page_list)); to_fill = min_t(unsigned int, to_alloc, @@ -460,8 +459,7 @@ static int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf, } struct mlx5_vhca_data_buffer * -mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, - size_t length, +mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, enum dma_data_direction dma_dir) { struct mlx5_vhca_data_buffer *buf; @@ -473,9 +471,8 @@ mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, buf->dma_dir = dma_dir; buf->migf = migf; - if (length) { - ret = mlx5vf_add_migration_pages(buf, - DIV_ROUND_UP_ULL(length, PAGE_SIZE)); + if (npages) { + ret = mlx5vf_add_migration_pages(buf, npages); if (ret) goto end; @@ -501,8 +498,8 @@ void mlx5vf_put_data_buffer(struct mlx5_vhca_data_buffer *buf) } struct mlx5_vhca_data_buffer * -mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, - size_t length, enum dma_data_direction dma_dir) +mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, + enum dma_data_direction dma_dir) { struct mlx5_vhca_data_buffer *buf, *temp_buf; struct list_head free_list; @@ -517,7 +514,7 @@ mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, list_for_each_entry_safe(buf, temp_buf, &migf->avail_list, buf_elm) { if (buf->dma_dir == dma_dir) { list_del_init(&buf->buf_elm); - if (buf->allocated_length >= length) { + if (buf->npages >= npages) { spin_unlock_irq(&migf->list_lock); goto found; } @@ -531,7 +528,7 @@ mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, } } spin_unlock_irq(&migf->list_lock); - buf = mlx5vf_alloc_data_buffer(migf, length, dma_dir); + buf = mlx5vf_alloc_data_buffer(migf, npages, dma_dir); found: while ((temp_buf = list_first_entry_or_null(&free_list, @@ -712,7 +709,7 @@ int mlx5vf_cmd_save_vhca_state(struct mlx5vf_pci_core_device *mvdev, MLX5_SET(save_vhca_state_in, in, op_mod, 0); MLX5_SET(save_vhca_state_in, in, vhca_id, mvdev->vhca_id); MLX5_SET(save_vhca_state_in, in, mkey, buf->mkey); - MLX5_SET(save_vhca_state_in, in, size, buf->allocated_length); + MLX5_SET(save_vhca_state_in, in, size, buf->npages * PAGE_SIZE); MLX5_SET(save_vhca_state_in, in, incremental, inc); MLX5_SET(save_vhca_state_in, in, set_track, track); @@ -734,8 +731,11 @@ int mlx5vf_cmd_save_vhca_state(struct mlx5vf_pci_core_device *mvdev, } if (!header_buf) { - header_buf = mlx5vf_get_data_buffer(migf, - sizeof(struct mlx5_vf_migration_header), DMA_NONE); + header_buf = mlx5vf_get_data_buffer( + migf, + DIV_ROUND_UP(sizeof(struct mlx5_vf_migration_header), + PAGE_SIZE), + DMA_NONE); if (IS_ERR(header_buf)) { err = PTR_ERR(header_buf); goto err_free; diff --git a/drivers/vfio/pci/mlx5/cmd.h b/drivers/vfio/pci/mlx5/cmd.h index df421dc6de04..7d4a833b6900 100644 --- a/drivers/vfio/pci/mlx5/cmd.h +++ b/drivers/vfio/pci/mlx5/cmd.h @@ -56,7 +56,7 @@ struct mlx5_vhca_data_buffer { struct sg_append_table table; loff_t start_pos; u64 length; - u64 allocated_length; + u32 npages; u32 mkey; enum dma_data_direction dma_dir; u8 dmaed:1; @@ -217,12 +217,12 @@ int mlx5vf_cmd_alloc_pd(struct mlx5_vf_migration_file *migf); void mlx5vf_cmd_dealloc_pd(struct mlx5_vf_migration_file *migf); void mlx5fv_cmd_clean_migf_resources(struct mlx5_vf_migration_file *migf); struct mlx5_vhca_data_buffer * -mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, - size_t length, enum dma_data_direction dma_dir); +mlx5vf_alloc_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, + enum dma_data_direction dma_dir); void mlx5vf_free_data_buffer(struct mlx5_vhca_data_buffer *buf); struct mlx5_vhca_data_buffer * -mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, - size_t length, enum dma_data_direction dma_dir); +mlx5vf_get_data_buffer(struct mlx5_vf_migration_file *migf, u32 npages, + enum dma_data_direction dma_dir); void mlx5vf_put_data_buffer(struct mlx5_vhca_data_buffer *buf); struct page *mlx5vf_get_migration_page(struct mlx5_vhca_data_buffer *buf, unsigned long offset); diff --git a/drivers/vfio/pci/mlx5/main.c b/drivers/vfio/pci/mlx5/main.c index 61d9b0f9146d..d899cd499e27 100644 --- a/drivers/vfio/pci/mlx5/main.c +++ b/drivers/vfio/pci/mlx5/main.c @@ -308,6 +308,7 @@ static struct mlx5_vhca_data_buffer * mlx5vf_mig_file_get_stop_copy_buf(struct mlx5_vf_migration_file *migf, u8 index, size_t required_length) { + u32 npages = DIV_ROUND_UP(required_length, PAGE_SIZE); struct mlx5_vhca_data_buffer *buf = migf->buf[index]; u8 chunk_num; @@ -315,12 +316,11 @@ mlx5vf_mig_file_get_stop_copy_buf(struct mlx5_vf_migration_file *migf, chunk_num = buf->stop_copy_chunk_num; buf->migf->buf[index] = NULL; /* Checking whether the pre-allocated buffer can fit */ - if (buf->allocated_length >= required_length) + if (buf->npages >= npages) return buf; mlx5vf_put_data_buffer(buf); - buf = mlx5vf_get_data_buffer(buf->migf, required_length, - DMA_FROM_DEVICE); + buf = mlx5vf_get_data_buffer(buf->migf, npages, DMA_FROM_DEVICE); if (IS_ERR(buf)) return buf; @@ -373,7 +373,8 @@ static int mlx5vf_add_stop_copy_header(struct mlx5_vf_migration_file *migf, u8 *to_buff; int ret; - header_buf = mlx5vf_get_data_buffer(migf, size, DMA_NONE); + header_buf = mlx5vf_get_data_buffer(migf, DIV_ROUND_UP(size, PAGE_SIZE), + DMA_NONE); if (IS_ERR(header_buf)) return PTR_ERR(header_buf); @@ -388,7 +389,7 @@ static int mlx5vf_add_stop_copy_header(struct mlx5_vf_migration_file *migf, to_buff = kmap_local_page(page); memcpy(to_buff, &header, sizeof(header)); header_buf->length = sizeof(header); - data.stop_copy_size = cpu_to_le64(migf->buf[0]->allocated_length); + data.stop_copy_size = cpu_to_le64(migf->buf[0]->npages * PAGE_SIZE); memcpy(to_buff + sizeof(header), &data, sizeof(data)); header_buf->length += sizeof(data); kunmap_local(to_buff); @@ -437,15 +438,20 @@ static int mlx5vf_prep_stop_copy(struct mlx5vf_pci_core_device *mvdev, num_chunks = mvdev->chunk_mode ? MAX_NUM_CHUNKS : 1; for (i = 0; i < num_chunks; i++) { - buf = mlx5vf_get_data_buffer(migf, inc_state_size, DMA_FROM_DEVICE); + buf = mlx5vf_get_data_buffer( + migf, DIV_ROUND_UP(inc_state_size, PAGE_SIZE), + DMA_FROM_DEVICE); if (IS_ERR(buf)) { ret = PTR_ERR(buf); goto err; } migf->buf[i] = buf; - buf = mlx5vf_get_data_buffer(migf, - sizeof(struct mlx5_vf_migration_header), DMA_NONE); + buf = mlx5vf_get_data_buffer( + migf, + DIV_ROUND_UP(sizeof(struct mlx5_vf_migration_header), + PAGE_SIZE), + DMA_NONE); if (IS_ERR(buf)) { ret = PTR_ERR(buf); goto err; @@ -553,7 +559,8 @@ static long mlx5vf_precopy_ioctl(struct file *filp, unsigned int cmd, * We finished transferring the current state and the device has a * dirty state, save a new state to be ready for. */ - buf = mlx5vf_get_data_buffer(migf, inc_length, DMA_FROM_DEVICE); + buf = mlx5vf_get_data_buffer(migf, DIV_ROUND_UP(inc_length, PAGE_SIZE), + DMA_FROM_DEVICE); if (IS_ERR(buf)) { ret = PTR_ERR(buf); mlx5vf_mark_err(migf); @@ -674,8 +681,8 @@ mlx5vf_pci_save_device_data(struct mlx5vf_pci_core_device *mvdev, bool track) if (track) { /* leave the allocated buffer ready for the stop-copy phase */ - buf = mlx5vf_alloc_data_buffer(migf, - migf->buf[0]->allocated_length, DMA_FROM_DEVICE); + buf = mlx5vf_alloc_data_buffer(migf, migf->buf[0]->npages, + DMA_FROM_DEVICE); if (IS_ERR(buf)) { ret = PTR_ERR(buf); goto out_pd; @@ -918,11 +925,14 @@ static ssize_t mlx5vf_resume_write(struct file *filp, const char __user *buf, goto out_unlock; break; case MLX5_VF_LOAD_STATE_PREP_HEADER_DATA: - if (vhca_buf_header->allocated_length < migf->record_size) { + { + u32 npages = DIV_ROUND_UP(migf->record_size, PAGE_SIZE); + + if (vhca_buf_header->npages < npages) { mlx5vf_free_data_buffer(vhca_buf_header); - migf->buf_header[0] = mlx5vf_alloc_data_buffer(migf, - migf->record_size, DMA_NONE); + migf->buf_header[0] = mlx5vf_alloc_data_buffer( + migf, npages, DMA_NONE); if (IS_ERR(migf->buf_header[0])) { ret = PTR_ERR(migf->buf_header[0]); migf->buf_header[0] = NULL; @@ -935,6 +945,7 @@ static ssize_t mlx5vf_resume_write(struct file *filp, const char __user *buf, vhca_buf_header->start_pos = migf->max_pos; migf->load_state = MLX5_VF_LOAD_STATE_READ_HEADER_DATA; break; + } case MLX5_VF_LOAD_STATE_READ_HEADER_DATA: ret = mlx5vf_resume_read_header_data(migf, vhca_buf_header, &buf, &len, pos, &done); @@ -945,12 +956,13 @@ static ssize_t mlx5vf_resume_write(struct file *filp, const char __user *buf, { u64 size = max(migf->record_size, migf->stop_copy_prep_size); + u32 npages = DIV_ROUND_UP(size, PAGE_SIZE); - if (vhca_buf->allocated_length < size) { + if (vhca_buf->npages < npages) { mlx5vf_free_data_buffer(vhca_buf); - migf->buf[0] = mlx5vf_alloc_data_buffer(migf, - size, DMA_TO_DEVICE); + migf->buf[0] = mlx5vf_alloc_data_buffer( + migf, npages, DMA_TO_DEVICE); if (IS_ERR(migf->buf[0])) { ret = PTR_ERR(migf->buf[0]); migf->buf[0] = NULL; @@ -1033,8 +1045,11 @@ mlx5vf_pci_resume_device_data(struct mlx5vf_pci_core_device *mvdev) } migf->buf[0] = buf; - buf = mlx5vf_alloc_data_buffer(migf, - sizeof(struct mlx5_vf_migration_header), DMA_NONE); + buf = mlx5vf_alloc_data_buffer( + migf, + DIV_ROUND_UP(sizeof(struct mlx5_vf_migration_header), + PAGE_SIZE), + DMA_NONE); if (IS_ERR(buf)) { ret = PTR_ERR(buf); goto out_buf; @@ -1151,7 +1166,8 @@ mlx5vf_pci_step_device_state_locked(struct mlx5vf_pci_core_device *mvdev, MLX5VF_QUERY_INC | MLX5VF_QUERY_CLEANUP); if (ret) return ERR_PTR(ret); - buf = mlx5vf_get_data_buffer(migf, size, DMA_FROM_DEVICE); + buf = mlx5vf_get_data_buffer(migf, + DIV_ROUND_UP(size, PAGE_SIZE), DMA_FROM_DEVICE); if (IS_ERR(buf)) return ERR_CAST(buf); /* pre_copy cleanup */