diff options
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx5/core/uar.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx5/core/uar.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/uar.c b/drivers/net/ethernet/mellanox/mlx5/core/uar.c index ce7fcebb81a3..6a081a8787a7 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/uar.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/uar.c @@ -231,3 +231,238 @@ void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar) mlx5_cmd_free_uar(mdev, uar->index); } EXPORT_SYMBOL(mlx5_unmap_free_uar); + +static int uars_per_sys_page(struct mlx5_core_dev *mdev) +{ + if (MLX5_CAP_GEN(mdev, uar_4k)) + return MLX5_CAP_GEN(mdev, num_of_uars_per_page); + + return 1; +} + +static u64 uar2pfn(struct mlx5_core_dev *mdev, u32 index) +{ + u32 system_page_index; + + if (MLX5_CAP_GEN(mdev, uar_4k)) + system_page_index = index >> (PAGE_SHIFT - MLX5_ADAPTER_PAGE_SHIFT); + else + system_page_index = index; + + return (pci_resource_start(mdev->pdev, 0) >> PAGE_SHIFT) + system_page_index; +} + +static void up_rel_func(struct kref *kref) +{ + struct mlx5_uars_page *up = container_of(kref, struct mlx5_uars_page, ref_count); + + list_del(&up->list); + if (mlx5_cmd_free_uar(up->mdev, up->index)) + mlx5_core_warn(up->mdev, "failed to free uar index %d\n", up->index); + kfree(up->reg_bitmap); + kfree(up->fp_bitmap); + kfree(up); +} + +static struct mlx5_uars_page *alloc_uars_page(struct mlx5_core_dev *mdev, + bool map_wc) +{ + struct mlx5_uars_page *up; + int err = -ENOMEM; + phys_addr_t pfn; + int bfregs; + int i; + + bfregs = uars_per_sys_page(mdev) * MLX5_BFREGS_PER_UAR; + up = kzalloc(sizeof(*up), GFP_KERNEL); + if (!up) + return ERR_PTR(err); + + up->mdev = mdev; + up->reg_bitmap = kcalloc(BITS_TO_LONGS(bfregs), sizeof(unsigned long), GFP_KERNEL); + if (!up->reg_bitmap) + goto error1; + + up->fp_bitmap = kcalloc(BITS_TO_LONGS(bfregs), sizeof(unsigned long), GFP_KERNEL); + if (!up->fp_bitmap) + goto error1; + + for (i = 0; i < bfregs; i++) + if ((i % MLX5_BFREGS_PER_UAR) < MLX5_NON_FP_BFREGS_PER_UAR) + set_bit(i, up->reg_bitmap); + else + set_bit(i, up->fp_bitmap); + + up->bfregs = bfregs; + up->fp_avail = bfregs * MLX5_FP_BFREGS_PER_UAR / MLX5_BFREGS_PER_UAR; + up->reg_avail = bfregs * MLX5_NON_FP_BFREGS_PER_UAR / MLX5_BFREGS_PER_UAR; + + err = mlx5_cmd_alloc_uar(mdev, &up->index); + if (err) { + mlx5_core_warn(mdev, "mlx5_cmd_alloc_uar() failed, %d\n", err); + goto error1; + } + + pfn = uar2pfn(mdev, up->index); + if (map_wc) { + up->map = ioremap_wc(pfn << PAGE_SHIFT, PAGE_SIZE); + if (!up->map) { + err = -EAGAIN; + goto error2; + } + } else { + up->map = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE); + if (!up->map) { + err = -ENOMEM; + goto error2; + } + } + kref_init(&up->ref_count); + mlx5_core_dbg(mdev, "allocated UAR page: index %d, total bfregs %d\n", + up->index, up->bfregs); + return up; + +error2: + if (mlx5_cmd_free_uar(mdev, up->index)) + mlx5_core_warn(mdev, "failed to free uar index %d\n", up->index); +error1: + kfree(up->fp_bitmap); + kfree(up->reg_bitmap); + kfree(up); + return ERR_PTR(err); +} + +static unsigned long map_offset(struct mlx5_core_dev *mdev, int dbi) +{ + /* return the offset in bytes from the start of the page to the + * blue flame area of the UAR + */ + return dbi / MLX5_BFREGS_PER_UAR * MLX5_ADAPTER_PAGE_SIZE + + (dbi % MLX5_BFREGS_PER_UAR) * + (1 << MLX5_CAP_GEN(mdev, log_bf_reg_size)) + MLX5_BF_OFFSET; +} + +static int alloc_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg, + bool map_wc, bool fast_path) +{ + struct mlx5_bfreg_data *bfregs; + struct mlx5_uars_page *up; + struct list_head *head; + unsigned long *bitmap; + unsigned int *avail; + struct mutex *lock; /* pointer to right mutex */ + int dbi; + + bfregs = &mdev->priv.bfregs; + if (map_wc) { + head = &bfregs->wc_head.list; + lock = &bfregs->wc_head.lock; + } else { + head = &bfregs->reg_head.list; + lock = &bfregs->reg_head.lock; + } + mutex_lock(lock); + if (list_empty(head)) { + up = alloc_uars_page(mdev, map_wc); + if (IS_ERR(up)) { + mutex_unlock(lock); + return PTR_ERR(up); + } + list_add(&up->list, head); + } else { + up = list_entry(head->next, struct mlx5_uars_page, list); + kref_get(&up->ref_count); + } + if (fast_path) { + bitmap = up->fp_bitmap; + avail = &up->fp_avail; + } else { + bitmap = up->reg_bitmap; + avail = &up->reg_avail; + } + dbi = find_first_bit(bitmap, up->bfregs); + clear_bit(dbi, bitmap); + (*avail)--; + if (!(*avail)) + list_del(&up->list); + + bfreg->map = up->map + map_offset(mdev, dbi); + bfreg->up = up; + bfreg->wc = map_wc; + bfreg->index = up->index + dbi / MLX5_BFREGS_PER_UAR; + mutex_unlock(lock); + + return 0; +} + +int mlx5_alloc_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg, + bool map_wc, bool fast_path) +{ + int err; + + err = alloc_bfreg(mdev, bfreg, map_wc, fast_path); + if (!err) + return 0; + + if (err == -EAGAIN && map_wc) + return alloc_bfreg(mdev, bfreg, false, fast_path); + + return err; +} +EXPORT_SYMBOL(mlx5_alloc_bfreg); + +static unsigned int addr_to_dbi_in_syspage(struct mlx5_core_dev *dev, + struct mlx5_uars_page *up, + struct mlx5_sq_bfreg *bfreg) +{ + unsigned int uar_idx; + unsigned int bfreg_idx; + unsigned int bf_reg_size; + + bf_reg_size = 1 << MLX5_CAP_GEN(dev, log_bf_reg_size); + + uar_idx = (bfreg->map - up->map) >> MLX5_ADAPTER_PAGE_SHIFT; + bfreg_idx = (((uintptr_t)bfreg->map % MLX5_ADAPTER_PAGE_SIZE) - MLX5_BF_OFFSET) / bf_reg_size; + + return uar_idx * MLX5_BFREGS_PER_UAR + bfreg_idx; +} + +void mlx5_free_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg) +{ + struct mlx5_bfreg_data *bfregs; + struct mlx5_uars_page *up; + struct mutex *lock; /* pointer to right mutex */ + unsigned int dbi; + bool fp; + unsigned int *avail; + unsigned long *bitmap; + struct list_head *head; + + bfregs = &mdev->priv.bfregs; + if (bfreg->wc) { + head = &bfregs->wc_head.list; + lock = &bfregs->wc_head.lock; + } else { + head = &bfregs->reg_head.list; + lock = &bfregs->reg_head.lock; + } + up = bfreg->up; + dbi = addr_to_dbi_in_syspage(mdev, up, bfreg); + fp = (dbi % MLX5_BFREGS_PER_UAR) >= MLX5_NON_FP_BFREGS_PER_UAR; + if (fp) { + avail = &up->fp_avail; + bitmap = up->fp_bitmap; + } else { + avail = &up->reg_avail; + bitmap = up->reg_bitmap; + } + mutex_lock(lock); + (*avail)++; + set_bit(dbi, bitmap); + if (*avail == 1) + list_add_tail(&up->list, head); + + kref_put(&up->ref_count, up_rel_func); + mutex_unlock(lock); +} +EXPORT_SYMBOL(mlx5_free_bfreg); 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