Commit 5918be3e authored by Weibo Zhao's avatar Weibo Zhao Committed by JiangShui
Browse files

hns3 udma: feature of record doorbell 

driver inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I85R2F


CVE: NA

--------------------------------------------------------------

This patch is the code for record doorbell. Record doorbell is
a 8B memory which saves value of jfr pi and jfc ci. It works
as doorbell but not real-time. When hardware need to update
jfr-pi for example, hardware would read jfr record doorbell to
update latest jfr pi value.

Signed-off-by: default avatarWeibo Zhao <zhaoweibo3@huawei.com>
parent 6060aa7b

drivers/ub/hw/hns3/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ ccflags-y += -I$(srctree)/drivers/net/ethernet/hisilicon/hns3/ \ 
		-I$(srctree)/drivers/ub/urma/



$(MODULE_NAME)-objs := hns3_udma_hw.o hns3_udma_main.o hns3_udma_cmd.o \

			hns3_udma_hem.o hns3_udma_qp.o hns3_udma_eq.o

			hns3_udma_hem.o hns3_udma_qp.o hns3_udma_eq.o \

			hns3_udma_db.o



obj-$(CONFIG_UB_UDMA_HNS3) := hns3_udma.o

drivers/ub/hw/hns3/hns3_udma_db.c

0 → 100644
+83 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Huawei UDMA Linux driver

 * Copyright (c) 2023-2023 Hisilicon Limited.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License

 * for more details.

 *

 */



#include <linux/scatterlist.h>

#include <linux/slab.h>

#include "urma/ubcore_api.h"

#include "hns3_udma_device.h"

#include "hns3_udma_db.h"



int udma_db_map_user(struct udma_dev *udma_dev, uint64_t virt,

		     struct udma_db *db)

{

	uint64_t page_addr = virt & PAGE_MASK;

	union ubcore_umem_flag access = {};

	struct udma_user_db_page *db_page;

	uint32_t offset;

	int ret = 0;



	mutex_lock(&udma_dev->pgdir_mutex);



	list_for_each_entry(db_page, &udma_dev->pgdir_list, list) {

		if (db_page->user_virt == page_addr)

			goto found;

	}



	db_page = kmalloc(sizeof(*db_page), GFP_KERNEL);

	if (!db_page) {

		ret = -ENOMEM;

		goto out;

	}



	refcount_set(&db_page->refcount, 1);

	db_page->user_virt = page_addr;

	access.bs.non_pin = 0;

	access.bs.writable = 1;

	db_page->umem = ubcore_umem_get(&udma_dev->ub_dev, page_addr,

					PAGE_SIZE, access);

	if (IS_ERR(db_page->umem)) {

		ret = PTR_ERR(db_page->umem);

		kfree(db_page);

		goto out;

	}



	list_add(&db_page->list, &udma_dev->pgdir_list);



found:

	offset = virt - page_addr;

	db->dma = sg_dma_address(db_page->umem->sg_head.sgl) + offset;

	db->virt_addr = (char *)sg_virt(db_page->umem->sg_head.sgl) + offset;

	db->user_page = db_page;

	refcount_inc(&db_page->refcount);



out:

	mutex_unlock(&udma_dev->pgdir_mutex);



	return ret;

}



void udma_db_unmap_user(struct udma_dev *udma_dev, struct udma_db *db)

{

	mutex_lock(&udma_dev->pgdir_mutex);



	refcount_dec(&db->user_page->refcount);

	if (refcount_dec_if_one(&db->user_page->refcount)) {

		list_del(&db->user_page->list);

		ubcore_umem_release(db->user_page->umem);

		kfree(db->user_page);

	}



	mutex_unlock(&udma_dev->pgdir_mutex);

}

drivers/ub/hw/hns3/hns3_udma_db.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/* Huawei UDMA Linux driver

 * Copyright (c) 2023-2023 Hisilicon Limited.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License

 * for more details.

 *

 */



#ifndef _UDMA_DB_H

#define _UDMA_DB_H



#include "hns3_udma_device.h"



int udma_db_map_user(struct udma_dev *udma_dev, uint64_t virt,

		     struct udma_db *db);



void udma_db_unmap_user(struct udma_dev *udma_dev, struct udma_db *db);



#endif /* _UDMA_DB_H */

drivers/ub/hw/hns3/hns3_udma_device.h

+15 −0
Original line number Diff line number Diff line
@@ -215,6 +215,13 @@ struct udma_mtr { 
	struct udma_hem_cfg	hem_cfg; /* config for hardware addressing */

};



struct udma_user_db_page {

	struct list_head	list;

	struct ubcore_umem	*umem;

	uint64_t		user_virt;

	refcount_t		refcount;

};



struct udma_ceqe {

	uint32_t	comp;

	uint32_t	rsv[15];
@@ -251,6 +258,14 @@ struct udma_work { 
};



struct udma_dev;



struct udma_db {

	uint32_t	*db_record;

	struct udma_user_db_page *user_page;

	dma_addr_t	dma;

	void		*virt_addr;

};



struct udma_ucontext {

	struct ubcore_ucontext		uctx;

	struct udma_uar			uar;