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/*
* Copyright (c) 2013-2015, 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/kernel.h>
#include <linux/module.h>
#include <linux/io-mapping.h>
#include <linux/mlx5/driver.h>
#include <linux/mlx5/cmd.h>
#include "mlx5_core.h"
int mlx5_cmd_alloc_uar(struct mlx5_core_dev *dev, u32 *uarn)
{
u32 out[MLX5_ST_SZ_DW(alloc_uar_out)] = {0};
u32 in[MLX5_ST_SZ_DW(alloc_uar_in)] = {0};
int err;
MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR);
err = mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
if (!err)
*uarn = MLX5_GET(alloc_uar_out, out, uar);
return err;
}
EXPORT_SYMBOL(mlx5_cmd_alloc_uar);
int mlx5_cmd_free_uar(struct mlx5_core_dev *dev, u32 uarn)
{
u32 out[MLX5_ST_SZ_DW(dealloc_uar_out)] = {0};
u32 in[MLX5_ST_SZ_DW(dealloc_uar_in)] = {0};
MLX5_SET(dealloc_uar_in, in, opcode, MLX5_CMD_OP_DEALLOC_UAR);
MLX5_SET(dealloc_uar_in, in, uar, uarn);
return mlx5_cmd_exec(dev, in, sizeof(in), out, sizeof(out));
}
EXPORT_SYMBOL(mlx5_cmd_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);
iounmap(up->map);
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);
}
struct mlx5_uars_page *mlx5_get_uars_page(struct mlx5_core_dev *mdev)
{
struct mlx5_uars_page *ret;
mutex_lock(&mdev->priv.bfregs.reg_head.lock);
if (!list_empty(&mdev->priv.bfregs.reg_head.list)) {
ret = list_first_entry(&mdev->priv.bfregs.reg_head.list,
struct mlx5_uars_page, list);
kref_get(&ret->ref_count);
goto out;
}
ret = alloc_uars_page(mdev, false);
if (IS_ERR(ret))
goto out;
list_add(&ret->list, &mdev->priv.bfregs.reg_head.list);
out:
mutex_unlock(&mdev->priv.bfregs.reg_head.lock);
return ret;
}
EXPORT_SYMBOL(mlx5_get_uars_page);
void mlx5_put_uars_page(struct mlx5_core_dev *mdev, struct mlx5_uars_page *up)
{
mutex_lock(&mdev->priv.bfregs.reg_head.lock);
kref_put(&up->ref_count, up_rel_func);
mutex_unlock(&mdev->priv.bfregs.reg_head.lock);
}
EXPORT_SYMBOL(mlx5_put_uars_page);
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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