cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vnic_wq_copy.c (3199B)

      1/*
      2 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
      3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
      4 *
      5 * This program is free software; you may redistribute it and/or modify
      6 * it under the terms of the GNU General Public License as published by
      7 * the Free Software Foundation; version 2 of the License.
      8 *
      9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     16 * SOFTWARE.
     17 */
     18
     19#include <linux/errno.h>
     20#include <linux/types.h>
     21#include <linux/pci.h>
     22#include <linux/delay.h>
     23#include "vnic_wq_copy.h"
     24
     25void vnic_wq_copy_enable(struct vnic_wq_copy *wq)
     26{
     27	iowrite32(1, &wq->ctrl->enable);
     28}
     29
     30int vnic_wq_copy_disable(struct vnic_wq_copy *wq)
     31{
     32	unsigned int wait;
     33
     34	iowrite32(0, &wq->ctrl->enable);
     35
     36	/* Wait for HW to ACK disable request */
     37	for (wait = 0; wait < 100; wait++) {
     38		if (!(ioread32(&wq->ctrl->running)))
     39			return 0;
     40		udelay(1);
     41	}
     42
     43	printk(KERN_ERR "Failed to disable Copy WQ[%d],"
     44	       " fetch index=%d, posted_index=%d\n",
     45	       wq->index, ioread32(&wq->ctrl->fetch_index),
     46	       ioread32(&wq->ctrl->posted_index));
     47
     48	return -ENODEV;
     49}
     50
     51void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
     52	void (*q_clean)(struct vnic_wq_copy *wq,
     53	struct fcpio_host_req *wq_desc))
     54{
     55	BUG_ON(ioread32(&wq->ctrl->enable));
     56
     57	if (vnic_wq_copy_desc_in_use(wq))
     58		vnic_wq_copy_service(wq, -1, q_clean);
     59
     60	wq->to_use_index = wq->to_clean_index = 0;
     61
     62	iowrite32(0, &wq->ctrl->fetch_index);
     63	iowrite32(0, &wq->ctrl->posted_index);
     64	iowrite32(0, &wq->ctrl->error_status);
     65
     66	vnic_dev_clear_desc_ring(&wq->ring);
     67}
     68
     69void vnic_wq_copy_free(struct vnic_wq_copy *wq)
     70{
     71	struct vnic_dev *vdev;
     72
     73	vdev = wq->vdev;
     74	vnic_dev_free_desc_ring(vdev, &wq->ring);
     75	wq->ctrl = NULL;
     76}
     77
     78int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
     79		       unsigned int index, unsigned int desc_count,
     80		       unsigned int desc_size)
     81{
     82	wq->index = index;
     83	wq->vdev = vdev;
     84	wq->to_use_index = wq->to_clean_index = 0;
     85	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
     86	if (!wq->ctrl) {
     87		printk(KERN_ERR "Failed to hook COPY WQ[%d] resource\n", index);
     88		return -EINVAL;
     89	}
     90
     91	vnic_wq_copy_disable(wq);
     92
     93	return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
     94}
     95
     96void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
     97	unsigned int error_interrupt_enable,
     98	unsigned int error_interrupt_offset)
     99{
    100	u64 paddr;
    101
    102	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
    103	writeq(paddr, &wq->ctrl->ring_base);
    104	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
    105	iowrite32(0, &wq->ctrl->fetch_index);
    106	iowrite32(0, &wq->ctrl->posted_index);
    107	iowrite32(cq_index, &wq->ctrl->cq_index);
    108	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
    109	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
    110}
    111