cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

vnic_cq.h (3176B)

      1/*
      2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
      3 *
      4 * This program is free software; you may redistribute it and/or modify
      5 * it under the terms of the GNU General Public License as published by
      6 * the Free Software Foundation; version 2 of the License.
      7 *
      8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
      9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     15 * SOFTWARE.
     16 */
     17
     18#ifndef _VNIC_CQ_H_
     19#define _VNIC_CQ_H_
     20
     21#include "cq_desc.h"
     22#include "vnic_dev.h"
     23
     24/* Completion queue control */
     25struct vnic_cq_ctrl {
     26	u64 ring_base;			/* 0x00 */
     27	u32 ring_size;			/* 0x08 */
     28	u32 pad0;
     29	u32 flow_control_enable;	/* 0x10 */
     30	u32 pad1;
     31	u32 color_enable;		/* 0x18 */
     32	u32 pad2;
     33	u32 cq_head;			/* 0x20 */
     34	u32 pad3;
     35	u32 cq_tail;			/* 0x28 */
     36	u32 pad4;
     37	u32 cq_tail_color;		/* 0x30 */
     38	u32 pad5;
     39	u32 interrupt_enable;		/* 0x38 */
     40	u32 pad6;
     41	u32 cq_entry_enable;		/* 0x40 */
     42	u32 pad7;
     43	u32 cq_message_enable;		/* 0x48 */
     44	u32 pad8;
     45	u32 interrupt_offset;		/* 0x50 */
     46	u32 pad9;
     47	u64 cq_message_addr;		/* 0x58 */
     48	u32 pad10;
     49};
     50
     51struct vnic_cq {
     52	unsigned int index;
     53	struct vnic_dev *vdev;
     54	struct vnic_cq_ctrl __iomem *ctrl;	/* memory-mapped */
     55	struct vnic_dev_ring ring;
     56	unsigned int to_clean;
     57	unsigned int last_color;
     58};
     59
     60static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
     61	unsigned int work_to_do,
     62	int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
     63	u8 type, u16 q_number, u16 completed_index, void *opaque),
     64	void *opaque)
     65{
     66	struct cq_desc *cq_desc;
     67	unsigned int work_done = 0;
     68	u16 q_number, completed_index;
     69	u8 type, color;
     70
     71	cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
     72		cq->ring.desc_size * cq->to_clean);
     73	cq_desc_dec(cq_desc, &type, &color,
     74		&q_number, &completed_index);
     75
     76	while (color != cq->last_color) {
     77
     78		if ((*q_service)(cq->vdev, cq_desc, type,
     79			q_number, completed_index, opaque))
     80			break;
     81
     82		cq->to_clean++;
     83		if (cq->to_clean == cq->ring.desc_count) {
     84			cq->to_clean = 0;
     85			cq->last_color = cq->last_color ? 0 : 1;
     86		}
     87
     88		cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
     89			cq->ring.desc_size * cq->to_clean);
     90		cq_desc_dec(cq_desc, &type, &color,
     91			&q_number, &completed_index);
     92
     93		work_done++;
     94		if (work_done >= work_to_do)
     95			break;
     96	}
     97
     98	return work_done;
     99}
    100
    101void svnic_cq_free(struct vnic_cq *cq);
    102int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
    103	unsigned int index, unsigned int desc_count, unsigned int desc_size);
    104void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
    105	unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
    106	unsigned int cq_tail_color, unsigned int interrupt_enable,
    107	unsigned int cq_entry_enable, unsigned int message_enable,
    108	unsigned int interrupt_offset, u64 message_addr);
    109void svnic_cq_clean(struct vnic_cq *cq);
    110#endif /* _VNIC_CQ_H_ */