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OpenCloudOS-Kernel/drivers/net/mlx4/mr.c

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/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
* Copyright (c) 2006, 2007 Cisco Systems, Inc. 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/init.h>
#include <linux/errno.h>
#include <linux/mlx4/cmd.h>
#include "mlx4.h"
#include "icm.h"
/*
* Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
*/
struct mlx4_mpt_entry {
__be32 flags;
__be32 qpn;
__be32 key;
__be32 pd;
__be64 start;
__be64 length;
__be32 lkey;
__be32 win_cnt;
u8 reserved1[3];
u8 mtt_rep;
__be64 mtt_seg;
__be32 mtt_sz;
__be32 entity_size;
__be32 first_byte_offset;
} __attribute__((packed));
#define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
#define MLX4_MPT_FLAG_MIO (1 << 17)
#define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
#define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
#define MLX4_MPT_FLAG_REGION (1 << 8)
#define MLX4_MTT_FLAG_PRESENT 1
#define MLX4_MPT_STATUS_SW 0xF0
#define MLX4_MPT_STATUS_HW 0x00
static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
{
int o;
int m;
u32 seg;
spin_lock(&buddy->lock);
for (o = order; o <= buddy->max_order; ++o) {
m = 1 << (buddy->max_order - o);
seg = find_first_bit(buddy->bits[o], m);
if (seg < m)
goto found;
}
spin_unlock(&buddy->lock);
return -1;
found:
clear_bit(seg, buddy->bits[o]);
while (o > order) {
--o;
seg <<= 1;
set_bit(seg ^ 1, buddy->bits[o]);
}
spin_unlock(&buddy->lock);
seg <<= order;
return seg;
}
static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
{
seg >>= order;
spin_lock(&buddy->lock);
while (test_bit(seg ^ 1, buddy->bits[order])) {
clear_bit(seg ^ 1, buddy->bits[order]);
seg >>= 1;
++order;
}
set_bit(seg, buddy->bits[order]);
spin_unlock(&buddy->lock);
}
static int mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
{
int i, s;
buddy->max_order = max_order;
spin_lock_init(&buddy->lock);
buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
GFP_KERNEL);
if (!buddy->bits)
goto err_out;
for (i = 0; i <= buddy->max_order; ++i) {
s = BITS_TO_LONGS(1 << (buddy->max_order - i));
buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
if (!buddy->bits[i])
goto err_out_free;
bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
}
set_bit(0, buddy->bits[buddy->max_order]);
return 0;
err_out_free:
for (i = 0; i <= buddy->max_order; ++i)
kfree(buddy->bits[i]);
kfree(buddy->bits);
err_out:
return -ENOMEM;
}
static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
{
int i;
for (i = 0; i <= buddy->max_order; ++i)
kfree(buddy->bits[i]);
kfree(buddy->bits);
}
static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
{
struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
u32 seg;
seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
if (seg == -1)
return -1;
if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
seg + (1 << order) - 1)) {
mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
return -1;
}
return seg;
}
int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
struct mlx4_mtt *mtt)
{
int i;
if (!npages) {
mtt->order = -1;
mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
return 0;
} else
mtt->page_shift = page_shift;
for (mtt->order = 0, i = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
++mtt->order;
mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
if (mtt->first_seg == -1)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL_GPL(mlx4_mtt_init);
void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
{
struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
if (mtt->order < 0)
return;
mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
mtt->first_seg + (1 << mtt->order) - 1);
}
EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
{
return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
}
EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
static u32 hw_index_to_key(u32 ind)
{
return (ind >> 24) | (ind << 8);
}
static u32 key_to_hw_index(u32 key)
{
return (key << 24) | (key >> 8);
}
static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
int mpt_index)
{
return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
MLX4_CMD_TIME_CLASS_B);
}
static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
int mpt_index)
{
return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
!mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
}
int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
int npages, int page_shift, struct mlx4_mr *mr)
{
struct mlx4_priv *priv = mlx4_priv(dev);
u32 index;
int err;
index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
if (index == -1)
return -ENOMEM;
mr->iova = iova;
mr->size = size;
mr->pd = pd;
mr->access = access;
mr->enabled = 0;
mr->key = hw_index_to_key(index);
err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
if (err)
mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
struct mlx4_priv *priv = mlx4_priv(dev);
int err;
if (mr->enabled) {
err = mlx4_HW2SW_MPT(dev, NULL,
key_to_hw_index(mr->key) &
(dev->caps.num_mpts - 1));
if (err)
mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
}
mlx4_mtt_cleanup(dev, &mr->mtt);
mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
}
EXPORT_SYMBOL_GPL(mlx4_mr_free);
int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
{
struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
struct mlx4_cmd_mailbox *mailbox;
struct mlx4_mpt_entry *mpt_entry;
int err;
err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
if (err)
return err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox)) {
err = PTR_ERR(mailbox);
goto err_table;
}
mpt_entry = mailbox->buf;
memset(mpt_entry, 0, sizeof *mpt_entry);
mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS |
MLX4_MPT_FLAG_MIO |
MLX4_MPT_FLAG_REGION |
mr->access);
mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key));
mpt_entry->pd = cpu_to_be32(mr->pd);
mpt_entry->start = cpu_to_be64(mr->iova);
mpt_entry->length = cpu_to_be64(mr->size);
mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
if (mr->mtt.order < 0) {
mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
mpt_entry->mtt_seg = 0;
} else
mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
err = mlx4_SW2HW_MPT(dev, mailbox,
key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
if (err) {
mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
goto err_cmd;
}
mr->enabled = 1;
mlx4_free_cmd_mailbox(dev, mailbox);
return 0;
err_cmd:
mlx4_free_cmd_mailbox(dev, mailbox);
err_table:
mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
return err;
}
EXPORT_SYMBOL_GPL(mlx4_mr_enable);
static int mlx4_write_mtt_chunk(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
int start_index, int npages, u64 *page_list)
{
struct mlx4_priv *priv = mlx4_priv(dev);
__be64 *mtts;
dma_addr_t dma_handle;
int i;
int s = start_index * sizeof (u64);
/* All MTTs must fit in the same page */
if (start_index / (PAGE_SIZE / sizeof (u64)) !=
(start_index + npages - 1) / (PAGE_SIZE / sizeof (u64)))
return -EINVAL;
if (start_index & (MLX4_MTT_ENTRY_PER_SEG - 1))
return -EINVAL;
mtts = mlx4_table_find(&priv->mr_table.mtt_table, mtt->first_seg +
s / dev->caps.mtt_entry_sz, &dma_handle);
if (!mtts)
return -ENOMEM;
for (i = 0; i < npages; ++i)
mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
dma_sync_single(&dev->pdev->dev, dma_handle, npages * sizeof (u64), DMA_TO_DEVICE);
return 0;
}
int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
int start_index, int npages, u64 *page_list)
{
int chunk;
int err;
if (mtt->order < 0)
return -EINVAL;
while (npages > 0) {
chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages);
err = mlx4_write_mtt_chunk(dev, mtt, start_index, chunk, page_list);
if (err)
return err;
npages -= chunk;
start_index += chunk;
page_list += chunk;
}
return 0;
}
EXPORT_SYMBOL_GPL(mlx4_write_mtt);
int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
struct mlx4_buf *buf)
{
u64 *page_list;
int err;
int i;
page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
if (!page_list)
return -ENOMEM;
for (i = 0; i < buf->npages; ++i)
if (buf->nbufs == 1)
page_list[i] = buf->direct.map + (i << buf->page_shift);
else
page_list[i] = buf->page_list[i].map;
err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
kfree(page_list);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
int mlx4_init_mr_table(struct mlx4_dev *dev)
{
struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
int err;
err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
~0, dev->caps.reserved_mrws);
if (err)
return err;
err = mlx4_buddy_init(&mr_table->mtt_buddy,
ilog2(dev->caps.num_mtt_segs));
if (err)
goto err_buddy;
if (dev->caps.reserved_mtts) {
if (mlx4_alloc_mtt_range(dev, fls(dev->caps.reserved_mtts - 1)) == -1) {
mlx4_warn(dev, "MTT table of order %d is too small.\n",
mr_table->mtt_buddy.max_order);
err = -ENOMEM;
goto err_reserve_mtts;
}
}
return 0;
err_reserve_mtts:
mlx4_buddy_cleanup(&mr_table->mtt_buddy);
err_buddy:
mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
return err;
}
void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
{
struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
mlx4_buddy_cleanup(&mr_table->mtt_buddy);
mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
}
static inline int mlx4_check_fmr(struct mlx4_fmr *fmr, u64 *page_list,
int npages, u64 iova)
{
int i, page_mask;
if (npages > fmr->max_pages)
return -EINVAL;
page_mask = (1 << fmr->page_shift) - 1;
/* We are getting page lists, so va must be page aligned. */
if (iova & page_mask)
return -EINVAL;
/* Trust the user not to pass misaligned data in page_list */
if (0)
for (i = 0; i < npages; ++i) {
if (page_list[i] & ~page_mask)
return -EINVAL;
}
if (fmr->maps >= fmr->max_maps)
return -EINVAL;
return 0;
}
int mlx4_map_phys_fmr(struct mlx4_dev *dev, struct mlx4_fmr *fmr, u64 *page_list,
int npages, u64 iova, u32 *lkey, u32 *rkey)
{
u32 key;
int i, err;
err = mlx4_check_fmr(fmr, page_list, npages, iova);
if (err)
return err;
++fmr->maps;
key = key_to_hw_index(fmr->mr.key);
key += dev->caps.num_mpts;
*lkey = *rkey = fmr->mr.key = hw_index_to_key(key);
*(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
/* Make sure MPT status is visible before writing MTT entries */
wmb();
for (i = 0; i < npages; ++i)
fmr->mtts[i] = cpu_to_be64(page_list[i] | MLX4_MTT_FLAG_PRESENT);
dma_sync_single(&dev->pdev->dev, fmr->dma_handle,
npages * sizeof(u64), DMA_TO_DEVICE);
fmr->mpt->key = cpu_to_be32(key);
fmr->mpt->lkey = cpu_to_be32(key);
fmr->mpt->length = cpu_to_be64(npages * (1ull << fmr->page_shift));
fmr->mpt->start = cpu_to_be64(iova);
/* Make MTT entries are visible before setting MPT status */
wmb();
*(u8 *) fmr->mpt = MLX4_MPT_STATUS_HW;
/* Make sure MPT status is visible before consumer can use FMR */
wmb();
return 0;
}
EXPORT_SYMBOL_GPL(mlx4_map_phys_fmr);
int mlx4_fmr_alloc(struct mlx4_dev *dev, u32 pd, u32 access, int max_pages,
int max_maps, u8 page_shift, struct mlx4_fmr *fmr)
{
struct mlx4_priv *priv = mlx4_priv(dev);
u64 mtt_seg;
int err = -ENOMEM;
if (page_shift < (ffs(dev->caps.page_size_cap) - 1) || page_shift >= 32)
return -EINVAL;
/* All MTTs must fit in the same page */
if (max_pages * sizeof *fmr->mtts > PAGE_SIZE)
return -EINVAL;
fmr->page_shift = page_shift;
fmr->max_pages = max_pages;
fmr->max_maps = max_maps;
fmr->maps = 0;
err = mlx4_mr_alloc(dev, pd, 0, 0, access, max_pages,
page_shift, &fmr->mr);
if (err)
return err;
mtt_seg = fmr->mr.mtt.first_seg * dev->caps.mtt_entry_sz;
fmr->mtts = mlx4_table_find(&priv->mr_table.mtt_table,
fmr->mr.mtt.first_seg,
&fmr->dma_handle);
if (!fmr->mtts) {
err = -ENOMEM;
goto err_free;
}
return 0;
err_free:
mlx4_mr_free(dev, &fmr->mr);
return err;
}
EXPORT_SYMBOL_GPL(mlx4_fmr_alloc);
int mlx4_fmr_enable(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
{
struct mlx4_priv *priv = mlx4_priv(dev);
int err;
err = mlx4_mr_enable(dev, &fmr->mr);
if (err)
return err;
fmr->mpt = mlx4_table_find(&priv->mr_table.dmpt_table,
key_to_hw_index(fmr->mr.key), NULL);
if (!fmr->mpt)
return -ENOMEM;
return 0;
}
EXPORT_SYMBOL_GPL(mlx4_fmr_enable);
void mlx4_fmr_unmap(struct mlx4_dev *dev, struct mlx4_fmr *fmr,
u32 *lkey, u32 *rkey)
{
if (!fmr->maps)
return;
fmr->maps = 0;
*(u8 *) fmr->mpt = MLX4_MPT_STATUS_SW;
}
EXPORT_SYMBOL_GPL(mlx4_fmr_unmap);
int mlx4_fmr_free(struct mlx4_dev *dev, struct mlx4_fmr *fmr)
{
if (fmr->maps)
return -EBUSY;
fmr->mr.enabled = 0;
mlx4_mr_free(dev, &fmr->mr);
return 0;
}
EXPORT_SYMBOL_GPL(mlx4_fmr_free);
int mlx4_SYNC_TPT(struct mlx4_dev *dev)
{
return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_SYNC_TPT, 1000);
}
EXPORT_SYMBOL_GPL(mlx4_SYNC_TPT);
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