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/*
* Copyright (c) 2004 Topspin Communications. 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.
*
* $Id: mthca_mr.c 1349 2004-12-16 21:09:43Z roland $
*/
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/errno.h>
#include "mthca_dev.h"
#include "mthca_cmd.h"
#include "mthca_memfree.h"
/*
* Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
*/
struct mthca_mpt_entry {
u32 flags;
u32 page_size;
u32 key;
u32 pd;
u64 start;
u64 length;
u32 lkey;
u32 window_count;
u32 window_count_limit;
u64 mtt_seg;
u32 mtt_sz; /* Arbel only */
u32 reserved[2];
} __attribute__((packed));
#define MTHCA_MPT_FLAG_SW_OWNS (0xfUL << 28)
#define MTHCA_MPT_FLAG_MIO (1 << 17)
#define MTHCA_MPT_FLAG_BIND_ENABLE (1 << 15)
#define MTHCA_MPT_FLAG_PHYSICAL (1 << 9)
#define MTHCA_MPT_FLAG_REGION (1 << 8)
#define MTHCA_MTT_FLAG_PRESENT 1
/*
* Buddy allocator for MTT segments (currently not very efficient
* since it doesn't keep a free list and just searches linearly
* through the bitmaps)
*/
static u32 mthca_buddy_alloc(struct mthca_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 mthca_buddy_free(struct mthca_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 __devinit mthca_buddy_init(struct mthca_buddy *buddy, int max_order)
{
int i, s;
buddy->max_order = max_order;
spin_lock_init(&buddy->lock);
buddy->bits = kmalloc((buddy->max_order + 1) * sizeof (long *),
GFP_KERNEL);
if (!buddy->bits)
goto err_out;
memset(buddy->bits, 0, (buddy->max_order + 1) * sizeof (long *));
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 __devexit mthca_buddy_cleanup(struct mthca_buddy *buddy)
{
int i;
for (i = 0; i <= buddy->max_order; ++i)
kfree(buddy->bits[i]);
kfree(buddy->bits);
}
static u32 mthca_alloc_mtt(struct mthca_dev *dev, int order,
struct mthca_buddy *buddy)
{
u32 seg = mthca_buddy_alloc(buddy, order);
if (seg == -1)
return -1;
if (dev->hca_type == ARBEL_NATIVE)
if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
seg + (1 << order) - 1)) {
mthca_buddy_free(buddy, seg, order);
seg = -1;
}
return seg;
}
static void mthca_free_mtt(struct mthca_dev *dev, u32 seg, int order,
struct mthca_buddy* buddy)
{
mthca_buddy_free(buddy, seg, order);
if (dev->hca_type == ARBEL_NATIVE)
mthca_table_put_range(dev, dev->mr_table.mtt_table, seg,
seg + (1 << order) - 1);
}
static inline u32 tavor_hw_index_to_key(u32 ind)
{
return ind;
}
static inline u32 tavor_key_to_hw_index(u32 key)
{
return key;
}
static inline u32 arbel_hw_index_to_key(u32 ind)
{
return (ind >> 24) | (ind << 8);
}
static inline u32 arbel_key_to_hw_index(u32 key)
{
return (key << 24) | (key >> 8);
}
static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
{
if (dev->hca_type == ARBEL_NATIVE)
return arbel_hw_index_to_key(ind);
else
return tavor_hw_index_to_key(ind);
}
static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
{
if (dev->hca_type == ARBEL_NATIVE)
return arbel_key_to_hw_index(key);
else
return tavor_key_to_hw_index(key);
}
int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
u32 access, struct mthca_mr *mr)
{
void *mailbox = NULL;
struct mthca_mpt_entry *mpt_entry;
u32 key;
int err;
u8 status;
might_sleep();
mr->order = -1;
key = mthca_alloc(&dev->mr_table.mpt_alloc);
if (key == -1)
return -ENOMEM;
mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
if (dev->hca_type == ARBEL_NATIVE) {
err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
if (err)
goto err_out_mpt_free;
}
mailbox = kmalloc(sizeof *mpt_entry + MTHCA_CMD_MAILBOX_EXTRA,
GFP_KERNEL);
if (!mailbox) {
err = -ENOMEM;
goto err_out_table;
}
mpt_entry = MAILBOX_ALIGN(mailbox);
mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS |
MTHCA_MPT_FLAG_MIO |
MTHCA_MPT_FLAG_PHYSICAL |
MTHCA_MPT_FLAG_REGION |
access);
mpt_entry->page_size = 0;
mpt_entry->key = cpu_to_be32(key);
mpt_entry->pd = cpu_to_be32(pd);
mpt_entry->start = 0;
mpt_entry->length = ~0ULL;
memset(&mpt_entry->lkey, 0,
sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
err = mthca_SW2HW_MPT(dev, mpt_entry,
key & (dev->limits.num_mpts - 1),
&status);
if (err) {
mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
goto err_out_table;
} else if (status) {
mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
status);
err = -EINVAL;
goto err_out_table;
}
kfree(mailbox);
return err;
err_out_table:
if (dev->hca_type == ARBEL_NATIVE)
mthca_table_put(dev, dev->mr_table.mpt_table, key);
err_out_mpt_free:
mthca_free(&dev->mr_table.mpt_alloc, key);
kfree(mailbox);
return err;
}
int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
u64 *buffer_list, int buffer_size_shift,
int list_len, u64 iova, u64 total_size,
u32 access, struct mthca_mr *mr)
{
void *mailbox;
u64 *mtt_entry;
struct mthca_mpt_entry *mpt_entry;
u32 key;
int err = -ENOMEM;
u8 status;
int i;
might_sleep();
WARN_ON(buffer_size_shift >= 32);
key = mthca_alloc(&dev->mr_table.mpt_alloc);
if (key == -1)
return -ENOMEM;
mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
if (dev->hca_type == ARBEL_NATIVE) {
err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
if (err)
goto err_out_mpt_free;
}
for (i = MTHCA_MTT_SEG_SIZE / 8, mr->order = 0;
i < list_len;
i <<= 1, ++mr->order)
; /* nothing */
mr->first_seg = mthca_alloc_mtt(dev, mr->order,
&dev->mr_table.mtt_buddy);
if (mr->first_seg == -1)
goto err_out_table;
/*
* If list_len is odd, we add one more dummy entry for
* firmware efficiency.
*/
mailbox = kmalloc(max(sizeof *mpt_entry,
(size_t) 8 * (list_len + (list_len & 1) + 2)) +
MTHCA_CMD_MAILBOX_EXTRA,
GFP_KERNEL);
if (!mailbox)
goto err_out_free_mtt;
mtt_entry = MAILBOX_ALIGN(mailbox);
mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
mr->first_seg * MTHCA_MTT_SEG_SIZE);
mtt_entry[1] = 0;
for (i = 0; i < list_len; ++i)
mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
MTHCA_MTT_FLAG_PRESENT);
if (list_len & 1) {
mtt_entry[i + 2] = 0;
++list_len;
}
if (0) {
mthca_dbg(dev, "Dumping MPT entry\n");
for (i = 0; i < list_len + 2; ++i)
printk(KERN_ERR "[%2d] %016llx\n",
i, (unsigned long long) be64_to_cpu(mtt_entry[i]));
}
err = mthca_WRITE_MTT(dev, mtt_entry, list_len, &status);
if (err) {
mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
goto err_out_mailbox_free;
}
if (status) {
mthca_warn(dev, "WRITE_MTT returned status 0x%02x\n",
status);
err = -EINVAL;
goto err_out_mailbox_free;
}
mpt_entry = MAILBOX_ALIGN(mailbox);
mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS |
MTHCA_MPT_FLAG_MIO |
MTHCA_MPT_FLAG_REGION |
access);
mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
mpt_entry->key = cpu_to_be32(key);
mpt_entry->pd = cpu_to_be32(pd);
mpt_entry->start = cpu_to_be64(iova);
mpt_entry->length = cpu_to_be64(total_size);
memset(&mpt_entry->lkey, 0,
sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
mpt_entry->mtt_seg = cpu_to_be64(dev->mr_table.mtt_base +
mr->first_seg * MTHCA_MTT_SEG_SIZE);
if (0) {
mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
if (i % 4 == 0)
printk("[%02x] ", i * 4);
printk(" %08x", be32_to_cpu(((u32 *) mpt_entry)[i]));
if ((i + 1) % 4 == 0)
printk("\n");
}
}
err = mthca_SW2HW_MPT(dev, mpt_entry,
key & (dev->limits.num_mpts - 1),
&status);
if (err)
mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
else if (status) {
mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
status);
err = -EINVAL;
}
kfree(mailbox);
return err;
err_out_mailbox_free:
kfree(mailbox);
err_out_free_mtt:
mthca_free_mtt(dev, mr->first_seg, mr->order, &dev->mr_table.mtt_buddy);
err_out_table:
if (dev->hca_type == ARBEL_NATIVE)
mthca_table_put(dev, dev->mr_table.mpt_table, key);
err_out_mpt_free:
mthca_free(&dev->mr_table.mpt_alloc, key);
return err;
}
void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
{
int err;
u8 status;
might_sleep();
err = mthca_HW2SW_MPT(dev, NULL,
key_to_hw_index(dev, mr->ibmr.lkey) &
(dev->limits.num_mpts - 1),
&status);
if (err)
mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
else if (status)
mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
status);
if (mr->order >= 0)
mthca_free_mtt(dev, mr->first_seg, mr->order, &dev->mr_table.mtt_buddy);
if (dev->hca_type == ARBEL_NATIVE)
mthca_table_put(dev, dev->mr_table.mpt_table,
key_to_hw_index(dev, mr->ibmr.lkey));
mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, mr->ibmr.lkey));
}
int __devinit mthca_init_mr_table(struct mthca_dev *dev)
{
int err;
err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
dev->limits.num_mpts,
~0, dev->limits.reserved_mrws);
if (err)
return err;
err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
fls(dev->limits.num_mtt_segs - 1));
if (err)
goto err_mtt_buddy;
if (dev->limits.reserved_mtts) {
if (mthca_alloc_mtt(dev, fls(dev->limits.reserved_mtts - 1),
&dev->mr_table.mtt_buddy) == -1) {
mthca_warn(dev, "MTT table of order %d is too small.\n",
dev->mr_table.mtt_buddy.max_order);
err = -ENOMEM;
goto err_mtt_buddy;
}
}
return 0;
err_mtt_buddy:
mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
return err;
}
void __devexit mthca_cleanup_mr_table(struct mthca_dev *dev)
{
/* XXX check if any MRs are still allocated? */
mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);
mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
}
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