/*
* 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"
#include "fw.h"
/*
* We allocate in as big chunks as we can, up to a maximum of 256 KB
* per chunk.
*/
enum {
MLX4_ICM_ALLOC_SIZE = 1 << 18,
MLX4_TABLE_CHUNK_SIZE = 1 << 18
};
void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm)
{
struct mlx4_icm_chunk *chunk, *tmp;
int i;
list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
if (chunk->nsg > 0)
pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
PCI_DMA_BIDIRECTIONAL);
for (i = 0; i < chunk->npages; ++i)
__free_pages(chunk->mem[i].page,
get_order(chunk->mem[i].length));
kfree(chunk);
}
kfree(icm);
}
struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
gfp_t gfp_mask)
{
struct mlx4_icm *icm;
struct mlx4_icm_chunk *chunk = NULL;
int cur_order;
icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
if (!icm)
return icm;
icm->refcount = 0;
INIT_LIST_HEAD(&icm->chunk_list);
cur_order = get_order(MLX4_ICM_ALLOC_SIZE);
while (npages > 0) {
if (!chunk) {
chunk = kmalloc(sizeof *chunk,
gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
if (!chunk)
goto fail;
chunk->npages = 0;
chunk->nsg = 0;
list_add_tail(&chunk->list, &icm->chunk_list);
}
while (1 << cur_order > npages)
--cur_order;
chunk->mem[chunk->npages].page = alloc_pages(gfp_mask, cur_order);
if (chunk->mem[chunk->npages].page) {
chunk->mem[chunk->npages].length = PAGE_SIZE << cur_order;
chunk->mem[chunk->npages].offset = 0;
if (++chunk->npages == MLX4_ICM_CHUNK_LEN) {
chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
chunk->npages,
PCI_DMA_BIDIRECTIONAL);
if (chunk->nsg <= 0)
goto fail;
chunk = NULL;
}
npages -= 1 << cur_order;
} else {
--cur_order;
if (cur_order < 0)
goto fail;
}
}
if (chunk) {
chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
chunk->npages,
PCI_DMA_BIDIRECTIONAL);
if (chunk->nsg <= 0)
goto fail;
}
return icm;
fail:
mlx4_free_icm(dev, icm);
return NULL;
}
static int mlx4_MAP_ICM(struct mlx4_dev *dev, struct mlx4_icm *icm, u64 virt)
{
return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM, icm, virt);
}
int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count)
{
return mlx4_cmd(dev, virt, page_count, 0, MLX4_CMD_UNMAP_ICM,
MLX4_CMD_TIME_CLASS_B);
}
int mlx4_MAP_ICM_page(struct mlx4_dev *dev, u64 dma_addr, u64 virt)
{
struct mlx4_cmd_mailbox *mailbox;
__be64 *inbox;
int err;
mailbox = mlx4_alloc_cmd_mailbox(dev);
if (IS_ERR(mailbox))
return PTR_ERR(mailbox);
inbox = mailbox->buf;
inbox[0] = cpu_to_be64(virt);
inbox[1] = cpu_to_be64(dma_addr);
err = mlx4_cmd(dev, mailbox->dma, 1, 0, MLX4_CMD_MAP_ICM,
MLX4_CMD_TIME_CLASS_B);
mlx4_free_cmd_mailbox(dev, mailbox);
if (!err)
mlx4_dbg(dev, "Mapped page at %llx to %llx for ICM.\n",
(unsigned long long) dma_addr, (unsigned long long) virt);
return err;
}
int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm)
{
return mlx4_map_cmd(dev, MLX4_CMD_MAP_ICM_AUX, icm, -1);
}
int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev)
{
return mlx4_cmd(dev, 0, 0, 0, MLX4_CMD_UNMAP_ICM_AUX, MLX4_CMD_TIME_CLASS_B);
}
int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
{
int i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
int ret = 0;
mutex_lock(&table->mutex);
if (table->icm[i]) {
++table->icm[i]->refcount;
goto out;
}
table->icm[i] = mlx4_alloc_icm(dev, MLX4_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
(table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
__GFP_NOWARN);
if (!table->icm[i]) {
ret = -ENOMEM;
goto out;
}
if (mlx4_MAP_ICM(dev, table->icm[i], table->virt +
(u64) i * MLX4_TABLE_CHUNK_SIZE)) {
mlx4_free_icm(dev, table->icm[i]);
table->icm[i] = NULL;
ret = -ENOMEM;
goto out;
}
++table->icm[i]->refcount;
out:
mutex_unlock(&table->mutex);
return ret;
}
void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj)
{
int i;
i = (obj & (table->num_obj - 1)) / (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
mutex_lock(&table->mutex);
if (--table->icm[i]->refcount == 0) {
mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
mlx4_free_icm(dev, table->icm[i]);
table->icm[i] = NULL;
}
mutex_unlock(&table->mutex);
}
void *mlx4_table_find(struct mlx4_icm_table *table, int obj)
{
int idx, offset, i;
struct mlx4_icm_chunk *chunk;
struct mlx4_icm *icm;
struct page *page = NULL;
if (!table->lowmem)
return NULL;
mutex_lock(&table->mutex);
idx = obj & (table->num_obj - 1);
icm = table->icm[idx / (MLX4_TABLE_CHUNK_SIZE / table->obj_size)];
offset = idx % (MLX4_TABLE_CHUNK_SIZE / table->obj_size);
if (!icm)
goto out;
list_for_each_entry(chunk, &icm->chunk_list, list) {
for (i = 0; i < chunk->npages; ++i) {
if (chunk->mem[i].length > offset) {
page = chunk->mem[i].page;
goto out;
}
offset -= chunk->mem[i].length;
}
}
out:
mutex_unlock(&table->mutex);
return page ? lowmem_page_address(page) + offset : NULL;
}
int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
int start, int end)
{
int inc = MLX4_TABLE_CHUNK_SIZE / table->obj_size;
int i, err;
for (i = start; i <= end; i += inc) {
err = mlx4_table_get(dev, table, i);
if (err)
goto fail;
}
return 0;
fail:
while (i > start) {
i -= inc;
mlx4_table_put(dev, table, i);
}
return err;
}
void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
int start, int end)
{
int i;
for (i = start; i <= end; i += MLX4_TABLE_CHUNK_SIZE / table->obj_size)
mlx4_table_put(dev, table, i);
}
int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
u64 virt, int obj_size, int nobj, int reserved,
int use_lowmem)
{
int obj_per_chunk;
int num_icm;
unsigned chunk_size;
int i;
obj_per_chunk = MLX4_TABLE_CHUNK_SIZE / obj_size;
num_icm = (nobj + obj_per_chunk - 1) / obj_per_chunk;
table->icm = kcalloc(num_icm, sizeof *table->icm, GFP_KERNEL);
if (!table->icm)
return -ENOMEM;
table->virt = virt;
table->num_icm = num_icm;
table->num_obj = nobj;
table->obj_size = obj_size;
table->lowmem = use_lowmem;
mutex_init(&table->mutex);
for (i = 0; i * MLX4_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
chunk_size = MLX4_TABLE_CHUNK_SIZE;
if ((i + 1) * MLX4_TABLE_CHUNK_SIZE > nobj * obj_size)
chunk_size = PAGE_ALIGN(nobj * obj_size - i * MLX4_TABLE_CHUNK_SIZE);
table->icm[i] = mlx4_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
(use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
__GFP_NOWARN);
if (!table->icm[i])
goto err;
if (mlx4_MAP_ICM(dev, table->icm[i], virt + i * MLX4_TABLE_CHUNK_SIZE)) {
mlx4_free_icm(dev, table->icm[i]);
table->icm[i] = NULL;
goto err;
}
/*
* Add a reference to this ICM chunk so that it never
* gets freed (since it contains reserved firmware objects).
*/
++table->icm[i]->refcount;
}
return 0;
err:
for (i = 0; i < num_icm; ++i)
if (table->icm[i]) {
mlx4_UNMAP_ICM(dev, virt + i * MLX4_TABLE_CHUNK_SIZE,
MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
mlx4_free_icm(dev, table->icm[i]);
}
return -ENOMEM;
}
void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table)
{
int i;
for (i = 0; i < table->num_icm; ++i)
if (table->icm[i]) {
mlx4_UNMAP_ICM(dev, table->virt + i * MLX4_TABLE_CHUNK_SIZE,
MLX4_TABLE_CHUNK_SIZE / MLX4_ICM_PAGE_SIZE);
mlx4_free_icm(dev, table->icm[i]);
}
kfree(table->icm);
}
