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/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) */
/*
* Copyright (c) 2017 Hisilicon Limited.
* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
*/
#include <linux/platform_device.h>
#include <rdma/ib_umem.h>
#include "hns_roce_device.h"
int hns_roce_db_map_user(struct hns_roce_ucontext *context, unsigned long virt,
struct hns_roce_db *db)
{
struct hns_roce_user_db_page *page;
int ret = 0;
mutex_lock(&context->page_mutex);
list_for_each_entry(page, &context->page_list, list)
if (page->user_virt == (virt & PAGE_MASK))
goto found;
page = kmalloc(sizeof(*page), GFP_KERNEL);
if (!page) {
ret = -ENOMEM;
goto out;
}
refcount_set(&page->refcount, 1);
page->user_virt = (virt & PAGE_MASK);
page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK,
PAGE_SIZE, 0, 0);
if (IS_ERR(page->umem)) {
ret = PTR_ERR(page->umem);
kfree(page);
goto out;
}
list_add(&page->list, &context->page_list);
found:
db->dma = sg_dma_address(page->umem->sg_head.sgl) +
(virt & ~PAGE_MASK);
db->u.user_page = page;
refcount_inc(&page->refcount);
out:
mutex_unlock(&context->page_mutex);
return ret;
}
EXPORT_SYMBOL(hns_roce_db_map_user);
void hns_roce_db_unmap_user(struct hns_roce_ucontext *context,
struct hns_roce_db *db)
{
mutex_lock(&context->page_mutex);
refcount_dec(&db->u.user_page->refcount);
if (refcount_dec_if_one(&db->u.user_page->refcount)) {
list_del(&db->u.user_page->list);
ib_umem_release(db->u.user_page->umem);
kfree(db->u.user_page);
}
mutex_unlock(&context->page_mutex);
}
EXPORT_SYMBOL(hns_roce_db_unmap_user);
static struct hns_roce_db_pgdir *hns_roce_alloc_db_pgdir(
struct device *dma_device)
{
struct hns_roce_db_pgdir *pgdir;
pgdir = kzalloc(sizeof(*pgdir), GFP_KERNEL);
if (!pgdir)
return NULL;
bitmap_fill(pgdir->order1, HNS_ROCE_DB_PER_PAGE / 2);
pgdir->bits[0] = pgdir->order0;
pgdir->bits[1] = pgdir->order1;
pgdir->page = dma_alloc_coherent(dma_device, PAGE_SIZE,
&pgdir->db_dma, GFP_KERNEL);
if (!pgdir->page) {
kfree(pgdir);
return NULL;
}
return pgdir;
}
static int hns_roce_alloc_db_from_pgdir(struct hns_roce_db_pgdir *pgdir,
struct hns_roce_db *db, int order)
{
int o;
int i;
for (o = order; o <= 1; ++o) {
i = find_first_bit(pgdir->bits[o], HNS_ROCE_DB_PER_PAGE >> o);
if (i < HNS_ROCE_DB_PER_PAGE >> o)
goto found;
}
return -ENOMEM;
found:
clear_bit(i, pgdir->bits[o]);
i <<= o;
if (o > order)
set_bit(i ^ 1, pgdir->bits[order]);
db->u.pgdir = pgdir;
db->index = i;
db->db_record = pgdir->page + db->index;
db->dma = pgdir->db_dma + db->index * 4;
db->order = order;
return 0;
}
int hns_roce_alloc_db(struct hns_roce_dev *hr_dev, struct hns_roce_db *db,
int order)
{
struct hns_roce_db_pgdir *pgdir;
int ret = 0;
mutex_lock(&hr_dev->pgdir_mutex);
list_for_each_entry(pgdir, &hr_dev->pgdir_list, list)
if (!hns_roce_alloc_db_from_pgdir(pgdir, db, order))
goto out;
pgdir = hns_roce_alloc_db_pgdir(hr_dev->dev);
if (!pgdir) {
ret = -ENOMEM;
goto out;
}
list_add(&pgdir->list, &hr_dev->pgdir_list);
/* This should never fail -- we just allocated an empty page: */
WARN_ON(hns_roce_alloc_db_from_pgdir(pgdir, db, order));
out:
mutex_unlock(&hr_dev->pgdir_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(hns_roce_alloc_db);
void hns_roce_free_db(struct hns_roce_dev *hr_dev, struct hns_roce_db *db)
{
int o;
int i;
mutex_lock(&hr_dev->pgdir_mutex);
o = db->order;
i = db->index;
if (db->order == 0 && test_bit(i ^ 1, db->u.pgdir->order0)) {
clear_bit(i ^ 1, db->u.pgdir->order0);
++o;
}
i >>= o;
set_bit(i, db->u.pgdir->bits[o]);
if (bitmap_full(db->u.pgdir->order1, HNS_ROCE_DB_PER_PAGE / 2)) {
dma_free_coherent(hr_dev->dev, PAGE_SIZE, db->u.pgdir->page,
db->u.pgdir->db_dma);
list_del(&db->u.pgdir->list);
kfree(db->u.pgdir);
}
mutex_unlock(&hr_dev->pgdir_mutex);
}
EXPORT_SYMBOL_GPL(hns_roce_free_db);
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