/*
* Copyright (c) 2009-2010 Chelsio, 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.
*/
/* Crude resource management */
#include <linux/kernel.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/kfifo.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/genalloc.h>
#include "iw_cxgb4.h"
#define RANDOM_SIZE 16
static int __c4iw_init_resource_fifo(struct kfifo *fifo,
spinlock_t *fifo_lock,
u32 nr, u32 skip_low,
u32 skip_high,
int random)
{
u32 i, j, entry = 0, idx;
u32 random_bytes;
u32 rarray[16];
spin_lock_init(fifo_lock);
if (kfifo_alloc(fifo, nr * sizeof(u32), GFP_KERNEL))
return -ENOMEM;
for (i = 0; i < skip_low + skip_high; i++)
kfifo_in(fifo, (unsigned char *) &entry, sizeof(u32));
if (random) {
j = 0;
random_bytes = random32();
for (i = 0; i < RANDOM_SIZE; i++)
rarray[i] = i + skip_low;
for (i = skip_low + RANDOM_SIZE; i < nr - skip_high; i++) {
if (j >= RANDOM_SIZE) {
j = 0;
random_bytes = random32();
}
idx = (random_bytes >> (j * 2)) & 0xF;
kfifo_in(fifo,
(unsigned char *) &rarray[idx],
sizeof(u32));
rarray[idx] = i;
j++;
}
for (i = 0; i < RANDOM_SIZE; i++)
kfifo_in(fifo,
(unsigned char *) &rarray[i],
sizeof(u32));
} else
for (i = skip_low; i < nr - skip_high; i++)
kfifo_in(fifo, (unsigned char *) &i, sizeof(u32));
for (i = 0; i < skip_low + skip_high; i++)
if (kfifo_out_locked(fifo, (unsigned char *) &entry,
sizeof(u32), fifo_lock))
break;
return 0;
}
static int c4iw_init_resource_fifo(struct kfifo *fifo, spinlock_t * fifo_lock,
u32 nr, u32 skip_low, u32 skip_high)
{
return __c4iw_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
skip_high, 0);
}
static int c4iw_init_resource_fifo_random(struct kfifo *fifo,
spinlock_t *fifo_lock,
u32 nr, u32 skip_low, u32 skip_high)
{
return __c4iw_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
skip_high, 1);
}
static int c4iw_init_qid_fifo(struct c4iw_rdev *rdev)
{
u32 i;
spin_lock_init(&rdev->resource.qid_fifo_lock);
if (kfifo_alloc(&rdev->resource.qid_fifo, T4_MAX_QIDS * sizeof(u32),
GFP_KERNEL))
return -ENOMEM;
for (i = T4_QID_BASE; i < T4_QID_BASE + T4_MAX_QIDS; i++)
if (!(i & rdev->qpmask))
kfifo_in(&rdev->resource.qid_fifo,
(unsigned char *) &i, sizeof(u32));
return 0;
}
/* nr_* must be power of 2 */
int c4iw_init_resource(struct c4iw_rdev *rdev, u32 nr_tpt, u32 nr_pdid)
{
int err = 0;
err = c4iw_init_resource_fifo_random(&rdev->resource.tpt_fifo,
&rdev->resource.tpt_fifo_lock,
nr_tpt, 1, 0);
if (err)
goto tpt_err;
err = c4iw_init_qid_fifo(rdev);
if (err)
goto qid_err;
err = c4iw_init_resource_fifo(&rdev->resource.pdid_fifo,
&rdev->resource.pdid_fifo_lock,
nr_pdid, 1, 0);
if (err)
goto pdid_err;
return 0;
pdid_err:
kfifo_free(&rdev->resource.qid_fifo);
qid_err:
kfifo_free(&rdev->resource.tpt_fifo);
tpt_err:
return -ENOMEM;
}
/*
* returns 0 if no resource available
*/
u32 c4iw_get_resource(struct kfifo *fifo, spinlock_t *lock)
{
u32 entry;
if (kfifo_out_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock))
return entry;
else
return 0;
}
void c4iw_put_resource(struct kfifo *fifo, u32 entry, spinlock_t *lock)
{
PDBG("%s entry 0x%x\n", __func__, entry);
kfifo_in_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock);
}
u32 c4iw_get_cqid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
{
struct c4iw_qid_list *entry;
u32 qid;
int i;
mutex_lock(&uctx->lock);
if (!list_empty(&uctx->cqids)) {
entry = list_entry(uctx->cqids.next, struct c4iw_qid_list,
entry);
list_del(&entry->entry);
qid = entry->qid;
kfree(entry);
} else {
qid = c4iw_get_resource(&rdev->resource.qid_fifo,
&rdev->resource.qid_fifo_lock);
if (!qid)
goto out;
for (i = qid+1; i & rdev->qpmask; i++) {
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
goto out;
entry->qid = i;
list_add_tail(&entry->entry, &uctx->cqids);
}
/*
* now put the same ids on the qp list since they all
* map to the same db/gts page.
*/
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
goto out;
entry->qid = qid;
list_add_tail(&entry->entry, &uctx->qpids);
for (i = qid+1; i & rdev->qpmask; i++) {
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
goto out;
entry->qid = i;
list_add_tail(&entry->entry, &uctx->qpids);
}
}
out:
mutex_unlock(&uctx->lock);
PDBG("%s qid 0x%x\n", __func__, qid);
return qid;
}
void c4iw_put_cqid(struct c4iw_rdev *rdev, u32 qid,
struct c4iw_dev_ucontext *uctx)
{
struct c4iw_qid_list *entry;
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
return;
PDBG("%s qid 0x%x\n", __func__, qid);
entry->qid = qid;
mutex_lock(&uctx->lock);
list_add_tail(&entry->entry, &uctx->cqids);
mutex_unlock(&uctx->lock);
}
u32 c4iw_get_qpid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
{
struct c4iw_qid_list *entry;
u32 qid;
int i;
mutex_lock(&uctx->lock);
if (!list_empty(&uctx->qpids)) {
entry = list_entry(uctx->qpids.next, struct c4iw_qid_list,
entry);
list_del(&entry->entry);
qid = entry->qid;
kfree(entry);
} else {
qid = c4iw_get_resource(&rdev->resource.qid_fifo,
&rdev->resource.qid_fifo_lock);
if (!qid)
goto out;
for (i = qid+1; i & rdev->qpmask; i++) {
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
goto out;
entry->qid = i;
list_add_tail(&entry->entry, &uctx->qpids);
}
/*
* now put the same ids on the cq list since they all
* map to the same db/gts page.
*/
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
goto out;
entry->qid = qid;
list_add_tail(&entry->entry, &uctx->cqids);
for (i = qid; i & rdev->qpmask; i++) {
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
goto out;
entry->qid = i;
list_add_tail(&entry->entry, &uctx->cqids);
}
}
out:
mutex_unlock(&uctx->lock);
PDBG("%s qid 0x%x\n", __func__, qid);
return qid;
}
void c4iw_put_qpid(struct c4iw_rdev *rdev, u32 qid,
struct c4iw_dev_ucontext *uctx)
{
struct c4iw_qid_list *entry;
entry = kmalloc(sizeof *entry, GFP_KERNEL);
if (!entry)
return;
PDBG("%s qid 0x%x\n", __func__, qid);
entry->qid = qid;
mutex_lock(&uctx->lock);
list_add_tail(&entry->entry, &uctx->qpids);
mutex_unlock(&uctx->lock);
}
void c4iw_destroy_resource(struct c4iw_resource *rscp)
{
kfifo_free(&rscp->tpt_fifo);
kfifo_free(&rscp->qid_fifo);
kfifo_free(&rscp->pdid_fifo);
}
/*
* PBL Memory Manager. Uses Linux generic allocator.
*/
#define MIN_PBL_SHIFT 8 /* 256B == min PBL size (32 entries) */
u32 c4iw_pblpool_alloc(struct c4iw_rdev *rdev, int size)
{
unsigned long addr = gen_pool_alloc(rdev->pbl_pool, size);
PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size);
return (u32)addr;
}
void c4iw_pblpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
PDBG("%s addr 0x%x size %d\n", __func__, addr, size);
gen_pool_free(rdev->pbl_pool, (unsigned long)addr, size);
}
int c4iw_pblpool_create(struct c4iw_rdev *rdev)
{
unsigned pbl_start, pbl_chunk, pbl_top;
rdev->pbl_pool = gen_pool_create(MIN_PBL_SHIFT, -1);
if (!rdev->pbl_pool)
return -ENOMEM;
pbl_start = rdev->lldi.vr->pbl.start;
pbl_chunk = rdev->lldi.vr->pbl.size;
pbl_top = pbl_start + pbl_chunk;
while (pbl_start < pbl_top) {
pbl_chunk = min(pbl_top - pbl_start + 1, pbl_chunk);
if (gen_pool_add(rdev->pbl_pool, pbl_start, pbl_chunk, -1)) {
PDBG("%s failed to add PBL chunk (%x/%x)\n",
__func__, pbl_start, pbl_chunk);
if (pbl_chunk <= 1024 << MIN_PBL_SHIFT) {
printk(KERN_WARNING MOD
"Failed to add all PBL chunks (%x/%x)\n",
pbl_start,
pbl_top - pbl_start);
return 0;
}
pbl_chunk >>= 1;
} else {
PDBG("%s added PBL chunk (%x/%x)\n",
__func__, pbl_start, pbl_chunk);
pbl_start += pbl_chunk;
}
}
return 0;
}
void c4iw_pblpool_destroy(struct c4iw_rdev *rdev)
{
gen_pool_destroy(rdev->pbl_pool);
}
/*
* RQT Memory Manager. Uses Linux generic allocator.
*/
#define MIN_RQT_SHIFT 10 /* 1KB == min RQT size (16 entries) */
u32 c4iw_rqtpool_alloc(struct c4iw_rdev *rdev, int size)
{
unsigned long addr = gen_pool_alloc(rdev->rqt_pool, size << 6);
PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size << 6);
return (u32)addr;
}
void c4iw_rqtpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
PDBG("%s addr 0x%x size %d\n", __func__, addr, size << 6);
gen_pool_free(rdev->rqt_pool, (unsigned long)addr, size << 6);
}
int c4iw_rqtpool_create(struct c4iw_rdev *rdev)
{
unsigned rqt_start, rqt_chunk, rqt_top;
rdev->rqt_pool = gen_pool_create(MIN_RQT_SHIFT, -1);
if (!rdev->rqt_pool)
return -ENOMEM;
rqt_start = rdev->lldi.vr->rq.start;
rqt_chunk = rdev->lldi.vr->rq.size;
rqt_top = rqt_start + rqt_chunk;
while (rqt_start < rqt_top) {
rqt_chunk = min(rqt_top - rqt_start + 1, rqt_chunk);
if (gen_pool_add(rdev->rqt_pool, rqt_start, rqt_chunk, -1)) {
PDBG("%s failed to add RQT chunk (%x/%x)\n",
__func__, rqt_start, rqt_chunk);
if (rqt_chunk <= 1024 << MIN_RQT_SHIFT) {
printk(KERN_WARNING MOD
"Failed to add all RQT chunks (%x/%x)\n",
rqt_start, rqt_top - rqt_start);
return 0;
}
rqt_chunk >>= 1;
} else {
PDBG("%s added RQT chunk (%x/%x)\n",
__func__, rqt_start, rqt_chunk);
rqt_start += rqt_chunk;
}
}
return 0;
}
void c4iw_rqtpool_destroy(struct c4iw_rdev *rdev)
{
gen_pool_destroy(rdev->rqt_pool);
}
