/*
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* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/io-mapping.h>
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#include <linux/mlx5/driver.h>
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#include "mlx5_core.h"
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int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn)
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{
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u32 out[MLX5_ST_SZ_DW(alloc_uar_out)] = {};
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u32 in[MLX5_ST_SZ_DW(alloc_uar_in)] = {};
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int err;
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MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR);
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err = mlx5_cmd_exec_inout(dev, alloc_uar, in, out);
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if (!err)
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*uarn = MLX5_GET(alloc_uar_out, out, uar);
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return err;
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}
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EXPORT_SYMBOL(mlx5_cmd_alloc_uar);
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int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn)
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{
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u32 in[MLX5_ST_SZ_DW(dealloc_uar_in)] = {};
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MLX5_SET(dealloc_uar_in, in, opcode, MLX5_CMD_OP_DEALLOC_UAR);
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MLX5_SET(dealloc_uar_in, in, uar, uarn);
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return mlx5_cmd_exec_in(dev, dealloc_uar, in);
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}
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EXPORT_SYMBOL(mlx5_cmd_free_uar);
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static int uars_per_sys_page(struct mlx5_core_dev *mdev)
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{
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if (MLX5_CAP_GEN(mdev, uar_4k))
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return MLX5_CAP_GEN(mdev, num_of_uars_per_page);
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return 1;
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}
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static u64 uar2pfn(struct mlx5_core_dev *mdev, u32 index)
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{
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u32 system_page_index;
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if (MLX5_CAP_GEN(mdev, uar_4k))
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system_page_index = index >> (PAGE_SHIFT - MLX5_ADAPTER_PAGE_SHIFT);
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else
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system_page_index = index;
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return (mdev->bar_addr >> PAGE_SHIFT) + system_page_index;
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}
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static void up_rel_func(struct kref *kref)
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{
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struct mlx5_uars_page *up = container_of(kref, struct mlx5_uars_page, ref_count);
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list_del(&up->list);
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iounmap(up->map);
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if (mlx5_cmd_free_uar(up->mdev, up->index))
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mlx5_core_warn(up->mdev, "failed to free uar index %d\n", up->index);
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bitmap_free(up->reg_bitmap);
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bitmap_free(up->fp_bitmap);
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kfree(up);
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}
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static struct mlx5_uars_page *alloc_uars_page(struct mlx5_core_dev *mdev,
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bool map_wc)
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{
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struct mlx5_uars_page *up;
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int err = -ENOMEM;
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phys_addr_t pfn;
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int bfregs;
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int i;
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bfregs = uars_per_sys_page(mdev) * MLX5_BFREGS_PER_UAR;
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up = kzalloc(sizeof(*up), GFP_KERNEL);
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if (!up)
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return ERR_PTR(err);
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up->mdev = mdev;
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up->reg_bitmap = bitmap_zalloc(bfregs, GFP_KERNEL);
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if (!up->reg_bitmap)
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goto error1;
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up->fp_bitmap = bitmap_zalloc(bfregs, GFP_KERNEL);
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if (!up->fp_bitmap)
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goto error1;
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for (i = 0; i < bfregs; i++)
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if ((i % MLX5_BFREGS_PER_UAR) < MLX5_NON_FP_BFREGS_PER_UAR)
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set_bit(i, up->reg_bitmap);
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else
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set_bit(i, up->fp_bitmap);
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up->bfregs = bfregs;
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up->fp_avail = bfregs * MLX5_FP_BFREGS_PER_UAR / MLX5_BFREGS_PER_UAR;
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up->reg_avail = bfregs * MLX5_NON_FP_BFREGS_PER_UAR / MLX5_BFREGS_PER_UAR;
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err = mlx5_cmd_alloc_uar(mdev, &up->index);
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if (err) {
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mlx5_core_warn(mdev, "mlx5_cmd_alloc_uar() failed, %d\n", err);
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goto error1;
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}
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pfn = uar2pfn(mdev, up->index);
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if (map_wc) {
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up->map = ioremap_wc(pfn << PAGE_SHIFT, PAGE_SIZE);
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if (!up->map) {
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err = -EAGAIN;
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goto error2;
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}
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} else {
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up->map = ioremap(pfn << PAGE_SHIFT, PAGE_SIZE);
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if (!up->map) {
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err = -ENOMEM;
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goto error2;
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}
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}
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kref_init(&up->ref_count);
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mlx5_core_dbg(mdev, "allocated UAR page: index %d, total bfregs %d\n",
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up->index, up->bfregs);
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return up;
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error2:
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if (mlx5_cmd_free_uar(mdev, up->index))
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mlx5_core_warn(mdev, "failed to free uar index %d\n", up->index);
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error1:
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bitmap_free(up->fp_bitmap);
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bitmap_free(up->reg_bitmap);
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kfree(up);
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return ERR_PTR(err);
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}
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struct mlx5_uars_page *mlx5_get_uars_page(struct mlx5_core_dev *mdev)
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{
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struct mlx5_uars_page *ret;
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mutex_lock(&mdev->priv.bfregs.reg_head.lock);
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if (!list_empty(&mdev->priv.bfregs.reg_head.list)) {
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ret = list_first_entry(&mdev->priv.bfregs.reg_head.list,
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struct mlx5_uars_page, list);
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kref_get(&ret->ref_count);
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goto out;
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}
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ret = alloc_uars_page(mdev, false);
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if (IS_ERR(ret))
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goto out;
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list_add(&ret->list, &mdev->priv.bfregs.reg_head.list);
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out:
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mutex_unlock(&mdev->priv.bfregs.reg_head.lock);
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return ret;
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}
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EXPORT_SYMBOL(mlx5_get_uars_page);
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void mlx5_put_uars_page(struct mlx5_core_dev *mdev, struct mlx5_uars_page *up)
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{
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mutex_lock(&mdev->priv.bfregs.reg_head.lock);
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kref_put(&up->ref_count, up_rel_func);
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mutex_unlock(&mdev->priv.bfregs.reg_head.lock);
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}
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EXPORT_SYMBOL(mlx5_put_uars_page);
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static unsigned long map_offset(struct mlx5_core_dev *mdev, int dbi)
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{
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/* return the offset in bytes from the start of the page to the
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* blue flame area of the UAR
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*/
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return dbi / MLX5_BFREGS_PER_UAR * MLX5_ADAPTER_PAGE_SIZE +
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(dbi % MLX5_BFREGS_PER_UAR) *
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(1 << MLX5_CAP_GEN(mdev, log_bf_reg_size)) + MLX5_BF_OFFSET;
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}
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static int alloc_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg,
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bool map_wc, bool fast_path)
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{
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struct mlx5_bfreg_data *bfregs;
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struct mlx5_uars_page *up;
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struct list_head *head;
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unsigned long *bitmap;
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unsigned int *avail;
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struct mutex *lock; /* pointer to right mutex */
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int dbi;
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bfregs = &mdev->priv.bfregs;
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if (map_wc) {
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head = &bfregs->wc_head.list;
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lock = &bfregs->wc_head.lock;
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} else {
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head = &bfregs->reg_head.list;
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lock = &bfregs->reg_head.lock;
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}
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mutex_lock(lock);
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if (list_empty(head)) {
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up = alloc_uars_page(mdev, map_wc);
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if (IS_ERR(up)) {
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mutex_unlock(lock);
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return PTR_ERR(up);
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}
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list_add(&up->list, head);
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} else {
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up = list_entry(head->next, struct mlx5_uars_page, list);
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kref_get(&up->ref_count);
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}
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if (fast_path) {
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bitmap = up->fp_bitmap;
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avail = &up->fp_avail;
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} else {
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bitmap = up->reg_bitmap;
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avail = &up->reg_avail;
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}
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dbi = find_first_bit(bitmap, up->bfregs);
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clear_bit(dbi, bitmap);
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(*avail)--;
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if (!(*avail))
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list_del(&up->list);
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bfreg->map = up->map + map_offset(mdev, dbi);
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bfreg->up = up;
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bfreg->wc = map_wc;
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bfreg->index = up->index + dbi / MLX5_BFREGS_PER_UAR;
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mutex_unlock(lock);
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return 0;
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}
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int mlx5_alloc_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg,
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bool map_wc, bool fast_path)
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{
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int err;
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err = alloc_bfreg(mdev, bfreg, map_wc, fast_path);
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if (!err)
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return 0;
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if (err == -EAGAIN && map_wc)
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return alloc_bfreg(mdev, bfreg, false, fast_path);
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return err;
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}
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EXPORT_SYMBOL(mlx5_alloc_bfreg);
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static unsigned int addr_to_dbi_in_syspage(struct mlx5_core_dev *dev,
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struct mlx5_uars_page *up,
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struct mlx5_sq_bfreg *bfreg)
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{
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unsigned int uar_idx;
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unsigned int bfreg_idx;
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unsigned int bf_reg_size;
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bf_reg_size = 1 << MLX5_CAP_GEN(dev, log_bf_reg_size);
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uar_idx = (bfreg->map - up->map) >> MLX5_ADAPTER_PAGE_SHIFT;
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bfreg_idx = (((uintptr_t)bfreg->map % MLX5_ADAPTER_PAGE_SIZE) - MLX5_BF_OFFSET) / bf_reg_size;
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return uar_idx * MLX5_BFREGS_PER_UAR + bfreg_idx;
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}
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void mlx5_free_bfreg(struct mlx5_core_dev *mdev, struct mlx5_sq_bfreg *bfreg)
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{
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struct mlx5_bfreg_data *bfregs;
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struct mlx5_uars_page *up;
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struct mutex *lock; /* pointer to right mutex */
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unsigned int dbi;
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bool fp;
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unsigned int *avail;
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unsigned long *bitmap;
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struct list_head *head;
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bfregs = &mdev->priv.bfregs;
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if (bfreg->wc) {
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head = &bfregs->wc_head.list;
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lock = &bfregs->wc_head.lock;
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} else {
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head = &bfregs->reg_head.list;
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lock = &bfregs->reg_head.lock;
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}
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up = bfreg->up;
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dbi = addr_to_dbi_in_syspage(mdev, up, bfreg);
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fp = (dbi % MLX5_BFREGS_PER_UAR) >= MLX5_NON_FP_BFREGS_PER_UAR;
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if (fp) {
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avail = &up->fp_avail;
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bitmap = up->fp_bitmap;
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} else {
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avail = &up->reg_avail;
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bitmap = up->reg_bitmap;
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}
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mutex_lock(lock);
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(*avail)++;
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set_bit(dbi, bitmap);
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if (*avail == 1)
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list_add_tail(&up->list, head);
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kref_put(&up->ref_count, up_rel_func);
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mutex_unlock(lock);
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}
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EXPORT_SYMBOL(mlx5_free_bfreg);
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