/*
 * 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/spinlock.h>
#include <linux/genalloc.h>
#include <linux/ratelimit.h>
#include "iw_cxgb4.h"

static int c4iw_init_qid_table(struct c4iw_rdev *rdev)
{
        u32 i;

        if (c4iw_id_table_alloc(&rdev->resource.qid_table,
                                rdev->lldi.vr->qp.start,
                                rdev->lldi.vr->qp.size,
                                rdev->lldi.vr->qp.size, 0))
                return -ENOMEM;

        for (i = rdev->lldi.vr->qp.start;
                i < rdev->lldi.vr->qp.start + rdev->lldi.vr->qp.size; i++)
                if (!(i & rdev->qpmask))
                        c4iw_id_free(&rdev->resource.qid_table, i);
        return 0;
}

/* nr_* must be power of 2 */
int c4iw_init_resource(struct c4iw_rdev *rdev, u32 nr_tpt,
                       u32 nr_pdid, u32 nr_srqt)
{
        int err = 0;
        err = c4iw_id_table_alloc(&rdev->resource.tpt_table, 0, nr_tpt, 1,
                                        C4IW_ID_TABLE_F_RANDOM);
        if (err)
                goto tpt_err;
        err = c4iw_init_qid_table(rdev);
        if (err)
                goto qid_err;
        err = c4iw_id_table_alloc(&rdev->resource.pdid_table, 0,
                                        nr_pdid, 1, 0);
        if (err)
                goto pdid_err;
        if (!nr_srqt)
                err = c4iw_id_table_alloc(&rdev->resource.srq_table, 0,
                                          1, 1, 0);
        else
                err = c4iw_id_table_alloc(&rdev->resource.srq_table, 0,
                                          nr_srqt, 0, 0);
        if (err)
                goto srq_err;
        return 0;
 srq_err:
        c4iw_id_table_free(&rdev->resource.pdid_table);
 pdid_err:
        c4iw_id_table_free(&rdev->resource.qid_table);
 qid_err:
        c4iw_id_table_free(&rdev->resource.tpt_table);
 tpt_err:
        return -ENOMEM;
}

/*
 * returns 0 if no resource available
 */
u32 c4iw_get_resource(struct c4iw_id_table *id_table)
{
        u32 entry;
        entry = c4iw_id_alloc(id_table);
        if (entry == (u32)(-1))
                return 0;
        return entry;
}

void c4iw_put_resource(struct c4iw_id_table *id_table, u32 entry)
{
        pr_debug("entry 0x%x\n", entry);
        c4iw_id_free(id_table, entry);
}

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_table);
                if (!qid)
                        goto out;
                mutex_lock(&rdev->stats.lock);
                rdev->stats.qid.cur += rdev->qpmask + 1;
                mutex_unlock(&rdev->stats.lock);
                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);
        pr_debug("qid 0x%x\n", qid);
        mutex_lock(&rdev->stats.lock);
        if (rdev->stats.qid.cur > rdev->stats.qid.max)
                rdev->stats.qid.max = rdev->stats.qid.cur;
        mutex_unlock(&rdev->stats.lock);
        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;
        pr_debug("qid 0x%x\n", 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_table);
                if (!qid) {
                        mutex_lock(&rdev->stats.lock);
                        rdev->stats.qid.fail++;
                        mutex_unlock(&rdev->stats.lock);
                        goto out;
                }
                mutex_lock(&rdev->stats.lock);
                rdev->stats.qid.cur += rdev->qpmask + 1;
                mutex_unlock(&rdev->stats.lock);
                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);
        pr_debug("qid 0x%x\n", qid);
        mutex_lock(&rdev->stats.lock);
        if (rdev->stats.qid.cur > rdev->stats.qid.max)
                rdev->stats.qid.max = rdev->stats.qid.cur;
        mutex_unlock(&rdev->stats.lock);
        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;
        pr_debug("qid 0x%x\n", 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)
{
        c4iw_id_table_free(&rscp->tpt_table);
        c4iw_id_table_free(&rscp->qid_table);
        c4iw_id_table_free(&rscp->pdid_table);
}

/*
 * 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);
        pr_debug("addr 0x%x size %d\n", (u32)addr, size);
        mutex_lock(&rdev->stats.lock);
        if (addr) {
                rdev->stats.pbl.cur += roundup(size, 1 << MIN_PBL_SHIFT);
                if (rdev->stats.pbl.cur > rdev->stats.pbl.max)
                        rdev->stats.pbl.max = rdev->stats.pbl.cur;
                kref_get(&rdev->pbl_kref);
        } else
                rdev->stats.pbl.fail++;
        mutex_unlock(&rdev->stats.lock);
        return (u32)addr;
}

static void destroy_pblpool(struct kref *kref)
{
        struct c4iw_rdev *rdev;

        rdev = container_of(kref, struct c4iw_rdev, pbl_kref);
        gen_pool_destroy(rdev->pbl_pool);
        complete(&rdev->pbl_compl);
}

void c4iw_pblpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
        pr_debug("addr 0x%x size %d\n", addr, size);
        mutex_lock(&rdev->stats.lock);
        rdev->stats.pbl.cur -= roundup(size, 1 << MIN_PBL_SHIFT);
        mutex_unlock(&rdev->stats.lock);
        gen_pool_free(rdev->pbl_pool, (unsigned long)addr, size);
        kref_put(&rdev->pbl_kref, destroy_pblpool);
}

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)) {
                        pr_debug("failed to add PBL chunk (%x/%x)\n",
                                 pbl_start, pbl_chunk);
                        if (pbl_chunk <= 1024 << MIN_PBL_SHIFT) {
                                pr_warn("Failed to add all PBL chunks (%x/%x)\n",
                                        pbl_start, pbl_top - pbl_start);
                                return 0;
                        }
                        pbl_chunk >>= 1;
                } else {
                        pr_debug("added PBL chunk (%x/%x)\n",
                                 pbl_start, pbl_chunk);
                        pbl_start += pbl_chunk;
                }
        }

        return 0;
}

void c4iw_pblpool_destroy(struct c4iw_rdev *rdev)
{
        kref_put(&rdev->pbl_kref, destroy_pblpool);
}

/*
 * 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);
        pr_debug("addr 0x%x size %d\n", (u32)addr, size << 6);
        if (!addr)
                pr_warn_ratelimited("%s: Out of RQT memory\n",
                                    pci_name(rdev->lldi.pdev));
        mutex_lock(&rdev->stats.lock);
        if (addr) {
                rdev->stats.rqt.cur += roundup(size << 6, 1 << MIN_RQT_SHIFT);
                if (rdev->stats.rqt.cur > rdev->stats.rqt.max)
                        rdev->stats.rqt.max = rdev->stats.rqt.cur;
                kref_get(&rdev->rqt_kref);
        } else
                rdev->stats.rqt.fail++;
        mutex_unlock(&rdev->stats.lock);
        return (u32)addr;
}

static void destroy_rqtpool(struct kref *kref)
{
        struct c4iw_rdev *rdev;

        rdev = container_of(kref, struct c4iw_rdev, rqt_kref);
        gen_pool_destroy(rdev->rqt_pool);
        complete(&rdev->rqt_compl);
}

void c4iw_rqtpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
        pr_debug("addr 0x%x size %d\n", addr, size << 6);
        mutex_lock(&rdev->stats.lock);
        rdev->stats.rqt.cur -= roundup(size << 6, 1 << MIN_RQT_SHIFT);
        mutex_unlock(&rdev->stats.lock);
        gen_pool_free(rdev->rqt_pool, (unsigned long)addr, size << 6);
        kref_put(&rdev->rqt_kref, destroy_rqtpool);
}

int c4iw_rqtpool_create(struct c4iw_rdev *rdev)
{
        unsigned rqt_start, rqt_chunk, rqt_top;
        int skip = 0;

        rdev->rqt_pool = gen_pool_create(MIN_RQT_SHIFT, -1);
        if (!rdev->rqt_pool)
                return -ENOMEM;

        /*
         * If SRQs are supported, then never use the first RQE from
         * the RQT region. This is because HW uses RQT index 0 as NULL.
         */
        if (rdev->lldi.vr->srq.size)
                skip = T4_RQT_ENTRY_SIZE;

        rqt_start = rdev->lldi.vr->rq.start + skip;
        rqt_chunk = rdev->lldi.vr->rq.size - skip;
        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)) {
                        pr_debug("failed to add RQT chunk (%x/%x)\n",
                                 rqt_start, rqt_chunk);
                        if (rqt_chunk <= 1024 << MIN_RQT_SHIFT) {
                                pr_warn("Failed to add all RQT chunks (%x/%x)\n",
                                        rqt_start, rqt_top - rqt_start);
                                return 0;
                        }
                        rqt_chunk >>= 1;
                } else {
                        pr_debug("added RQT chunk (%x/%x)\n",
                                 rqt_start, rqt_chunk);
                        rqt_start += rqt_chunk;
                }
        }
        return 0;
}

void c4iw_rqtpool_destroy(struct c4iw_rdev *rdev)
{
        kref_put(&rdev->rqt_kref, destroy_rqtpool);
}

int c4iw_alloc_srq_idx(struct c4iw_rdev *rdev)
{
        int idx;

        idx = c4iw_id_alloc(&rdev->resource.srq_table);
        mutex_lock(&rdev->stats.lock);
        if (idx == -1) {
                rdev->stats.srqt.fail++;
                mutex_unlock(&rdev->stats.lock);
                return -ENOMEM;
        }
        rdev->stats.srqt.cur++;
        if (rdev->stats.srqt.cur > rdev->stats.srqt.max)
                rdev->stats.srqt.max = rdev->stats.srqt.cur;
        mutex_unlock(&rdev->stats.lock);
        return idx;
}

void c4iw_free_srq_idx(struct c4iw_rdev *rdev, int idx)
{
        c4iw_id_free(&rdev->resource.srq_table, idx);
        mutex_lock(&rdev->stats.lock);
        rdev->stats.srqt.cur--;
        mutex_unlock(&rdev->stats.lock);
}

/*
 * On-Chip QP Memory.
 */
#define MIN_OCQP_SHIFT 12       /* 4KB == min ocqp size */

u32 c4iw_ocqp_pool_alloc(struct c4iw_rdev *rdev, int size)
{
        unsigned long addr = gen_pool_alloc(rdev->ocqp_pool, size);
        pr_debug("addr 0x%x size %d\n", (u32)addr, size);
        if (addr) {
                mutex_lock(&rdev->stats.lock);
                rdev->stats.ocqp.cur += roundup(size, 1 << MIN_OCQP_SHIFT);
                if (rdev->stats.ocqp.cur > rdev->stats.ocqp.max)
                        rdev->stats.ocqp.max = rdev->stats.ocqp.cur;
                mutex_unlock(&rdev->stats.lock);
        }
        return (u32)addr;
}

void c4iw_ocqp_pool_free(struct c4iw_rdev *rdev, u32 addr, int size)
{
        pr_debug("addr 0x%x size %d\n", addr, size);
        mutex_lock(&rdev->stats.lock);
        rdev->stats.ocqp.cur -= roundup(size, 1 << MIN_OCQP_SHIFT);
        mutex_unlock(&rdev->stats.lock);
        gen_pool_free(rdev->ocqp_pool, (unsigned long)addr, size);
}

int c4iw_ocqp_pool_create(struct c4iw_rdev *rdev)
{
        unsigned start, chunk, top;

        rdev->ocqp_pool = gen_pool_create(MIN_OCQP_SHIFT, -1);
        if (!rdev->ocqp_pool)
                return -ENOMEM;

        start = rdev->lldi.vr->ocq.start;
        chunk = rdev->lldi.vr->ocq.size;
        top = start + chunk;

        while (start < top) {
                chunk = min(top - start + 1, chunk);
                if (gen_pool_add(rdev->ocqp_pool, start, chunk, -1)) {
                        pr_debug("failed to add OCQP chunk (%x/%x)\n",
                                 start, chunk);
                        if (chunk <= 1024 << MIN_OCQP_SHIFT) {
                                pr_warn("Failed to add all OCQP chunks (%x/%x)\n",
                                        start, top - start);
                                return 0;
                        }
                        chunk >>= 1;
                } else {
                        pr_debug("added OCQP chunk (%x/%x)\n",
                                 start, chunk);
                        start += chunk;
                }
        }
        return 0;
}

void c4iw_ocqp_pool_destroy(struct c4iw_rdev *rdev)
{
        gen_pool_destroy(rdev->ocqp_pool);
}