1 files changed, 178 insertions, 193 deletions

diff --git a/drivers/vfio/pci/mlx5/cmd.c b/drivers/vfio/pci/mlx5/cmd.c
index 11eda6b207f1..5b919a0b2524 100644
--- a/drivers/vfio/pci/mlx5/cmd.c
+++ b/drivers/vfio/pci/mlx5/cmd.c
@@ -313,40 +313,21 @@ err_exec:
 	return ret;
 }
 
-static int _create_mkey(struct mlx5_core_dev *mdev, u32 pdn,
-			struct mlx5_vhca_data_buffer *buf,
-			struct mlx5_vhca_recv_buf *recv_buf,
-			u32 *mkey)
+static u32 *alloc_mkey_in(u32 npages, u32 pdn)
 {
-	size_t npages = buf ? DIV_ROUND_UP(buf->allocated_length, PAGE_SIZE) :
-				recv_buf->npages;
-	int err = 0, inlen;
-	__be64 *mtt;
+	int inlen;
 	void *mkc;
 	u32 *in;
 
 	inlen = MLX5_ST_SZ_BYTES(create_mkey_in) +
-		sizeof(*mtt) * round_up(npages, 2);
+		sizeof(__be64) * round_up(npages, 2);
 
-	in = kvzalloc(inlen, GFP_KERNEL);
+	in = kvzalloc(inlen, GFP_KERNEL_ACCOUNT);
 	if (!in)
-		return -ENOMEM;
+		return NULL;
 
 	MLX5_SET(create_mkey_in, in, translations_octword_actual_size,
 		 DIV_ROUND_UP(npages, 2));
-	mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, in, klm_pas_mtt);
-
-	if (buf) {
-		struct sg_dma_page_iter dma_iter;
-
-		for_each_sgtable_dma_page(&buf->table.sgt, &dma_iter, 0)
-			*mtt++ = cpu_to_be64(sg_page_iter_dma_address(&dma_iter));
-	} else {
-		int i;
-
-		for (i = 0; i < npages; i++)
-			*mtt++ = cpu_to_be64(recv_buf->dma_addrs[i]);
-	}
 
 	mkc = MLX5_ADDR_OF(create_mkey_in, in, memory_key_mkey_entry);
 	MLX5_SET(mkc, mkc, access_mode_1_0, MLX5_MKC_ACCESS_MODE_MTT);
@@ -360,8 +341,81 @@ static int _create_mkey(struct mlx5_core_dev *mdev, u32 pdn,
 	MLX5_SET(mkc, mkc, log_page_size, PAGE_SHIFT);
 	MLX5_SET(mkc, mkc, translations_octword_size, DIV_ROUND_UP(npages, 2));
 	MLX5_SET64(mkc, mkc, len, npages * PAGE_SIZE);
-	err = mlx5_core_create_mkey(mdev, mkey, in, inlen);
-	kvfree(in);
+
+	return 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,
+				 enum dma_data_direction dir)
+{
+	dma_addr_t addr;
+	__be64 *mtt;
+	int i;
+
+	if (dma_use_iova(state)) {
+		dma_iova_destroy(mdev->device, state, npages * PAGE_SIZE, dir,
+				 0);
+	} 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(mdev->device, addr, PAGE_SIZE, dir);
+		}
+	}
+}
+
+static int register_dma_pages(struct mlx5_core_dev *mdev, u32 npages,
+			      struct page **page_list, u32 *mkey_in,
+			      struct dma_iova_state *state,
+			      enum dma_data_direction dir)
+{
+	dma_addr_t addr;
+	size_t mapped = 0;
+	__be64 *mtt;
+	int i, err;
+
+	mtt = (__be64 *)MLX5_ADDR_OF(create_mkey_in, mkey_in, klm_pas_mtt);
+
+	if (dma_iova_try_alloc(mdev->device, state, 0, npages * PAGE_SIZE)) {
+		addr = state->addr;
+		for (i = 0; i < npages; i++) {
+			err = dma_iova_link(mdev->device, state,
+					    page_to_phys(page_list[i]), mapped,
+					    PAGE_SIZE, dir, 0);
+			if (err)
+				goto error;
+			*mtt++ = cpu_to_be64(addr);
+			addr += PAGE_SIZE;
+			mapped += PAGE_SIZE;
+		}
+		err = dma_iova_sync(mdev->device, state, 0, mapped);
+		if (err)
+			goto error;
+	} else {
+		for (i = 0; i < npages; i++) {
+			addr = dma_map_page(mdev->device, page_list[i], 0,
+					    PAGE_SIZE, dir);
+			err = dma_mapping_error(mdev->device, addr);
+			if (err)
+				goto error;
+			*mtt++ = cpu_to_be64(addr);
+		}
+	}
+	return 0;
+
+error:
+	unregister_dma_pages(mdev, i, mkey_in, state, dir);
 	return err;
 }
 
@@ -375,97 +429,97 @@ 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->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)
+		return -ENOMEM;
 
-	ret = _create_mkey(mdev, buf->migf->pdn, buf, NULL, &buf->mkey);
+	ret = register_dma_pages(mdev, buf->npages, buf->page_list,
+				 buf->mkey_in, &buf->state, buf->dma_dir);
 	if (ret)
-		goto err;
+		goto err_register_dma;
 
-	buf->dmaed = true;
+	ret = create_mkey(mdev, buf->npages, buf->mkey_in, &buf->mkey);
+	if (ret)
+		goto err_create_mkey;
 
 	return 0;
-err:
-	dma_unmap_sgtable(mdev->device, &buf->table.sgt, buf->dma_dir, 0);
+
+err_create_mkey:
+	unregister_dma_pages(mdev, buf->npages, buf->mkey_in, &buf->state,
+			     buf->dma_dir);
+err_register_dma:
+	kvfree(buf->mkey_in);
+	buf->mkey_in = NULL;
 	return ret;
 }
 
+static void free_page_list(u32 npages, struct page **page_list)
+{
+	int i;
+
+	/* Undo alloc_pages_bulk() */
+	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);
-		dma_unmap_sgtable(migf->mvdev->mdev->device, &buf->table.sgt,
-				  buf->dma_dir, 0);
+	if (buf->mkey_in) {
+		mlx5_core_destroy_mkey(mdev, buf->mkey);
+		unregister_dma_pages(mdev, buf->npages, buf->mkey_in,
+				     &buf->state, buf->dma_dir);
+		kvfree(buf->mkey_in);
 	}
 
-	/* Undo alloc_pages_bulk() */
-	for_each_sgtable_page(&buf->table.sgt, &sg_iter, 0)
-		__free_page(sg_page_iter_page(&sg_iter));
-	sg_free_append_table(&buf->table);
+	free_page_list(buf->npages, buf->page_list);
 	kfree(buf);
 }
 
-static int mlx5vf_add_migration_pages(struct mlx5_vhca_data_buffer *buf,
-				      unsigned int npages)
+static int mlx5vf_add_pages(struct page ***page_list, unsigned int npages)
 {
-	unsigned int to_alloc = npages;
-	struct page **page_list;
-	unsigned long filled;
-	unsigned int to_fill;
-	int ret;
+	unsigned int filled, done = 0;
 	int i;
 
-	to_fill = min_t(unsigned int, npages, PAGE_SIZE / sizeof(*page_list));
-	page_list = kvzalloc(to_fill * sizeof(*page_list), GFP_KERNEL_ACCOUNT);
-	if (!page_list)
+	*page_list =
+		kvcalloc(npages, sizeof(struct page *), GFP_KERNEL_ACCOUNT);
+	if (!*page_list)
 		return -ENOMEM;
 
-	do {
-		filled = alloc_pages_bulk(GFP_KERNEL_ACCOUNT, to_fill,
-					  page_list);
-		if (!filled) {
-			ret = -ENOMEM;
+	for (;;) {
+		filled = alloc_pages_bulk(GFP_KERNEL_ACCOUNT, npages - done,
+					  *page_list + done);
+		if (!filled)
 			goto err;
-		}
-		to_alloc -= filled;
-		ret = sg_alloc_append_table_from_pages(
-			&buf->table, page_list, filled, 0,
-			filled << PAGE_SHIFT, UINT_MAX, SG_MAX_SINGLE_ALLOC,
-			GFP_KERNEL_ACCOUNT);
 
-		if (ret)
-			goto err_append;
-		buf->allocated_length += filled * PAGE_SIZE;
-		/* clean input for another bulk allocation */
-		memset(page_list, 0, filled * sizeof(*page_list));
-		to_fill = min_t(unsigned int, to_alloc,
-				PAGE_SIZE / sizeof(*page_list));
-	} while (to_alloc > 0);
+		done += filled;
+		if (done == npages)
+			break;
+	}
 
-	kvfree(page_list);
 	return 0;
 
-err_append:
-	for (i = filled - 1; i >= 0; i--)
-		__free_page(page_list[i]);
 err:
-	kvfree(page_list);
-	return ret;
+	for (i = 0; i < done; i++)
+		__free_page(*page_list[i]);
+
+	kvfree(*page_list);
+	*page_list = NULL;
+	return -ENOMEM;
 }
 
 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;
@@ -477,12 +531,13 @@ 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_pages(&buf->page_list, npages);
 		if (ret)
 			goto end;
 
+		buf->npages = npages;
+
 		if (dma_dir != DMA_NONE) {
 			ret = mlx5vf_dma_data_buffer(buf);
 			if (ret)
@@ -505,8 +560,8 @@ 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;
@@ -521,7 +576,7 @@ 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;
 			}
@@ -535,7 +590,7 @@ 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,
@@ -716,7 +771,7 @@ 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);
 
@@ -738,8 +793,11 @@ 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;
@@ -783,7 +841,7 @@ int mlx5vf_cmd_load_vhca_state(struct mlx5vf_pci_core_device *mvdev,
 	if (mvdev->mdev_detach)
 		return -ENOTCONN;
 
-	if (!buf->dmaed) {
+	if (!buf->mkey_in) {
 		err = mlx5vf_dma_data_buffer(buf);
 		if (err)
 			return err;
@@ -1338,103 +1396,16 @@ 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() */
-	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)
-{
-	unsigned int filled = 0, done = 0;
-	int i;
-
-	recv_buf->page_list = kvcalloc(npages, sizeof(*recv_buf->page_list),
-				       GFP_KERNEL_ACCOUNT);
-	if (!recv_buf->page_list)
-		return -ENOMEM;
-
-	for (;;) {
-		filled = alloc_pages_bulk(GFP_KERNEL_ACCOUNT,
-					  npages - done,
-					  recv_buf->page_list + done);
-		if (!filled)
-			goto err;
-
-		done += filled;
-		if (done == npages)
-			break;
-	}
-
-	recv_buf->npages = npages;
-	return 0;
-
-err:
-	for (i = 0; i < npages; i++) {
-		if (recv_buf->page_list[i])
-			__free_page(recv_buf->page_list[i]);
-	}
-
-	kvfree(recv_buf->page_list);
-	return -ENOMEM;
-}
-
-static int register_dma_recv_pages(struct mlx5_core_dev *mdev,
-				   struct mlx5_vhca_recv_buf *recv_buf)
-{
-	int i, j;
-
-	recv_buf->dma_addrs = kvcalloc(recv_buf->npages,
-				       sizeof(*recv_buf->dma_addrs),
-				       GFP_KERNEL_ACCOUNT);
-	if (!recv_buf->dma_addrs)
-		return -ENOMEM;
-
-	for (i = 0; i < recv_buf->npages; i++) {
-		recv_buf->dma_addrs[i] = dma_map_page(mdev->device,
-						      recv_buf->page_list[i],
-						      0, PAGE_SIZE,
-						      DMA_FROM_DEVICE);
-		if (dma_mapping_error(mdev->device, recv_buf->dma_addrs[i]))
-			goto error;
-	}
-	return 0;
-
-error:
-	for (j = 0; j < i; j++)
-		dma_unmap_single(mdev->device, recv_buf->dma_addrs[j],
-				 PAGE_SIZE, DMA_FROM_DEVICE);
-
-	kvfree(recv_buf->dma_addrs);
-	return -ENOMEM;
-}
-
-static void unregister_dma_recv_pages(struct mlx5_core_dev *mdev,
-				      struct mlx5_vhca_recv_buf *recv_buf)
-{
-	int i;
-
-	for (i = 0; i < recv_buf->npages; i++)
-		dma_unmap_single(mdev->device, recv_buf->dma_addrs[i],
-				 PAGE_SIZE, DMA_FROM_DEVICE);
-
-	kvfree(recv_buf->dma_addrs);
-}
-
 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_recv_pages(mdev, recv_buf);
-	free_recv_pages(&qp->recv_buf);
+	unregister_dma_pages(mdev, recv_buf->npages, recv_buf->mkey_in,
+			     &recv_buf->state, DMA_FROM_DEVICE);
+	kvfree(recv_buf->mkey_in);
+	free_page_list(recv_buf->npages, recv_buf->page_list);
 }
 
 static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev,
@@ -1445,24 +1416,38 @@ static int mlx5vf_alloc_qp_recv_resources(struct mlx5_core_dev *mdev,
 	struct mlx5_vhca_recv_buf *recv_buf = &qp->recv_buf;
 	int err;
 
-	err = alloc_recv_pages(recv_buf, npages);
-	if (err < 0)
+	err = mlx5vf_add_pages(&recv_buf->page_list, npages);
+	if (err)
 		return err;
 
-	err = register_dma_recv_pages(mdev, recv_buf);
-	if (err)
+	recv_buf->npages = npages;
+
+	recv_buf->mkey_in = alloc_mkey_in(npages, pdn);
+	if (!recv_buf->mkey_in) {
+		err = -ENOMEM;
 		goto end;
+	}
+
+	err = register_dma_pages(mdev, npages, recv_buf->page_list,
+				 recv_buf->mkey_in, &recv_buf->state,
+				 DMA_FROM_DEVICE);
+	if (err)
+		goto err_register_dma;
 
-	err = _create_mkey(mdev, pdn, NULL, recv_buf, &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_recv_pages(mdev, recv_buf);
+	unregister_dma_pages(mdev, npages, recv_buf->mkey_in, &recv_buf->state,
+			     DMA_FROM_DEVICE);
+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;
 }