diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/pd.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/pd.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/pd.c b/drivers/net/ethernet/mellanox/mlx4/pd.c new file mode 100644 index 00000000000..1286b886dce --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx4/pd.c @@ -0,0 +1,210 @@ +/* + * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2005 Mellanox Technologies. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/errno.h> +#include <linux/io-mapping.h> + +#include <asm/page.h> + +#include "mlx4.h" +#include "icm.h" + +enum { + MLX4_NUM_RESERVED_UARS = 8 +}; + +int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + + *pdn = mlx4_bitmap_alloc(&priv->pd_bitmap); + if (*pdn == -1) + return -ENOMEM; + + return 0; +} +EXPORT_SYMBOL_GPL(mlx4_pd_alloc); + +void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn) +{ + mlx4_bitmap_free(&mlx4_priv(dev)->pd_bitmap, pdn); +} +EXPORT_SYMBOL_GPL(mlx4_pd_free); + +int mlx4_init_pd_table(struct mlx4_dev *dev) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + + return mlx4_bitmap_init(&priv->pd_bitmap, dev->caps.num_pds, + (1 << 24) - 1, dev->caps.reserved_pds, 0); +} + +void mlx4_cleanup_pd_table(struct mlx4_dev *dev) +{ + mlx4_bitmap_cleanup(&mlx4_priv(dev)->pd_bitmap); +} + + +int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar) +{ + uar->index = mlx4_bitmap_alloc(&mlx4_priv(dev)->uar_table.bitmap); + if (uar->index == -1) + return -ENOMEM; + + uar->pfn = (pci_resource_start(dev->pdev, 2) >> PAGE_SHIFT) + uar->index; + uar->map = NULL; + + return 0; +} +EXPORT_SYMBOL_GPL(mlx4_uar_alloc); + +void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar) +{ + mlx4_bitmap_free(&mlx4_priv(dev)->uar_table.bitmap, uar->index); +} +EXPORT_SYMBOL_GPL(mlx4_uar_free); + +int mlx4_bf_alloc(struct mlx4_dev *dev, struct mlx4_bf *bf) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + struct mlx4_uar *uar; + int err = 0; + int idx; + + if (!priv->bf_mapping) + return -ENOMEM; + + mutex_lock(&priv->bf_mutex); + if (!list_empty(&priv->bf_list)) + uar = list_entry(priv->bf_list.next, struct mlx4_uar, bf_list); + else { + if (mlx4_bitmap_avail(&priv->uar_table.bitmap) < MLX4_NUM_RESERVED_UARS) { + err = -ENOMEM; + goto out; + } + uar = kmalloc(sizeof *uar, GFP_KERNEL); + if (!uar) { + err = -ENOMEM; + goto out; + } + err = mlx4_uar_alloc(dev, uar); + if (err) + goto free_kmalloc; + + uar->map = ioremap(uar->pfn << PAGE_SHIFT, PAGE_SIZE); + if (!uar->map) { + err = -ENOMEM; + goto free_uar; + } + + uar->bf_map = io_mapping_map_wc(priv->bf_mapping, uar->index << PAGE_SHIFT); + if (!uar->bf_map) { + err = -ENOMEM; + goto unamp_uar; + } + uar->free_bf_bmap = 0; + list_add(&uar->bf_list, &priv->bf_list); + } + + bf->uar = uar; + idx = ffz(uar->free_bf_bmap); + uar->free_bf_bmap |= 1 << idx; + bf->uar = uar; + bf->offset = 0; + bf->buf_size = dev->caps.bf_reg_size / 2; + bf->reg = uar->bf_map + idx * dev->caps.bf_reg_size; + if (uar->free_bf_bmap == (1 << dev->caps.bf_regs_per_page) - 1) + list_del_init(&uar->bf_list); + + goto out; + +unamp_uar: + bf->uar = NULL; + iounmap(uar->map); + +free_uar: + mlx4_uar_free(dev, uar); + +free_kmalloc: + kfree(uar); + +out: + mutex_unlock(&priv->bf_mutex); + return err; +} +EXPORT_SYMBOL_GPL(mlx4_bf_alloc); + +void mlx4_bf_free(struct mlx4_dev *dev, struct mlx4_bf *bf) +{ + struct mlx4_priv *priv = mlx4_priv(dev); + int idx; + + if (!bf->uar || !bf->uar->bf_map) + return; + + mutex_lock(&priv->bf_mutex); + idx = (bf->reg - bf->uar->bf_map) / dev->caps.bf_reg_size; + bf->uar->free_bf_bmap &= ~(1 << idx); + if (!bf->uar->free_bf_bmap) { + if (!list_empty(&bf->uar->bf_list)) + list_del(&bf->uar->bf_list); + + io_mapping_unmap(bf->uar->bf_map); + iounmap(bf->uar->map); + mlx4_uar_free(dev, bf->uar); + kfree(bf->uar); + } else if (list_empty(&bf->uar->bf_list)) + list_add(&bf->uar->bf_list, &priv->bf_list); + + mutex_unlock(&priv->bf_mutex); +} +EXPORT_SYMBOL_GPL(mlx4_bf_free); + +int mlx4_init_uar_table(struct mlx4_dev *dev) +{ + if (dev->caps.num_uars <= 128) { + mlx4_err(dev, "Only %d UAR pages (need more than 128)\n", + dev->caps.num_uars); + mlx4_err(dev, "Increase firmware log2_uar_bar_megabytes?\n"); + return -ENODEV; + } + + return mlx4_bitmap_init(&mlx4_priv(dev)->uar_table.bitmap, + dev->caps.num_uars, dev->caps.num_uars - 1, + max(128, dev->caps.reserved_uars), 0); +} + +void mlx4_cleanup_uar_table(struct mlx4_dev *dev) +{ + mlx4_bitmap_cleanup(&mlx4_priv(dev)->uar_table.bitmap); +} |