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![Christoph Hellwig](/assets/img/avatar_default.png)
Switch from the legacy PCI DMA API to the generic DMA API. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
569 lines
14 KiB
C
569 lines
14 KiB
C
/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/spinlock.h>
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#include <linux/mempool.h>
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#include <scsi/scsi_tcq.h>
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#include "snic_io.h"
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#include "snic.h"
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#include "cq_enet_desc.h"
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#include "snic_fwint.h"
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static void
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snic_wq_cmpl_frame_send(struct vnic_wq *wq,
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struct cq_desc *cq_desc,
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struct vnic_wq_buf *buf,
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void *opaque)
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{
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struct snic *snic = svnic_dev_priv(wq->vdev);
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SNIC_BUG_ON(buf->os_buf == NULL);
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if (snic_log_level & SNIC_DESC_LOGGING)
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SNIC_HOST_INFO(snic->shost,
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"Ack received for snic_host_req %p.\n",
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buf->os_buf);
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SNIC_TRC(snic->shost->host_no, 0, 0,
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((ulong)(buf->os_buf) - sizeof(struct snic_req_info)), 0, 0,
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0);
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buf->os_buf = NULL;
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}
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static int
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snic_wq_cmpl_handler_cont(struct vnic_dev *vdev,
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struct cq_desc *cq_desc,
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u8 type,
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u16 q_num,
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u16 cmpl_idx,
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void *opaque)
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{
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struct snic *snic = svnic_dev_priv(vdev);
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unsigned long flags;
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SNIC_BUG_ON(q_num != 0);
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spin_lock_irqsave(&snic->wq_lock[q_num], flags);
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svnic_wq_service(&snic->wq[q_num],
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cq_desc,
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cmpl_idx,
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snic_wq_cmpl_frame_send,
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NULL);
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spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
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return 0;
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} /* end of snic_cmpl_handler_cont */
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int
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snic_wq_cmpl_handler(struct snic *snic, int work_to_do)
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{
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unsigned int work_done = 0;
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unsigned int i;
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snic->s_stats.misc.last_ack_time = jiffies;
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for (i = 0; i < snic->wq_count; i++) {
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work_done += svnic_cq_service(&snic->cq[i],
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work_to_do,
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snic_wq_cmpl_handler_cont,
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NULL);
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}
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return work_done;
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} /* end of snic_wq_cmpl_handler */
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void
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snic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
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{
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struct snic_host_req *req = buf->os_buf;
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struct snic *snic = svnic_dev_priv(wq->vdev);
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struct snic_req_info *rqi = NULL;
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unsigned long flags;
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dma_unmap_single(&snic->pdev->dev, buf->dma_addr, buf->len,
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DMA_TO_DEVICE);
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rqi = req_to_rqi(req);
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spin_lock_irqsave(&snic->spl_cmd_lock, flags);
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if (list_empty(&rqi->list)) {
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spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
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goto end;
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}
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SNIC_BUG_ON(rqi->list.next == NULL); /* if not added to spl_cmd_list */
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list_del_init(&rqi->list);
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spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
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if (rqi->sge_va) {
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snic_pci_unmap_rsp_buf(snic, rqi);
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kfree((void *)rqi->sge_va);
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rqi->sge_va = 0;
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}
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snic_req_free(snic, rqi);
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SNIC_HOST_INFO(snic->shost, "snic_free_wq_buf .. freed.\n");
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end:
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return;
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}
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/* Criteria to select work queue in multi queue mode */
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static int
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snic_select_wq(struct snic *snic)
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{
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/* No multi queue support for now */
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BUILD_BUG_ON(SNIC_WQ_MAX > 1);
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return 0;
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}
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static int
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snic_wqdesc_avail(struct snic *snic, int q_num, int req_type)
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{
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int nr_wqdesc = snic->config.wq_enet_desc_count;
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if (q_num > 0) {
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/*
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* Multi Queue case, additional care is required.
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* Per WQ active requests need to be maintained.
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*/
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SNIC_HOST_INFO(snic->shost, "desc_avail: Multi Queue case.\n");
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SNIC_BUG_ON(q_num > 0);
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return -1;
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}
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nr_wqdesc -= atomic64_read(&snic->s_stats.fw.actv_reqs);
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return ((req_type == SNIC_REQ_HBA_RESET) ? nr_wqdesc : nr_wqdesc - 1);
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}
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int
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snic_queue_wq_desc(struct snic *snic, void *os_buf, u16 len)
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{
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dma_addr_t pa = 0;
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unsigned long flags;
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struct snic_fw_stats *fwstats = &snic->s_stats.fw;
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struct snic_host_req *req = (struct snic_host_req *) os_buf;
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long act_reqs;
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long desc_avail = 0;
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int q_num = 0;
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snic_print_desc(__func__, os_buf, len);
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/* Map request buffer */
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pa = dma_map_single(&snic->pdev->dev, os_buf, len, DMA_TO_DEVICE);
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if (dma_mapping_error(&snic->pdev->dev, pa)) {
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SNIC_HOST_ERR(snic->shost, "qdesc: PCI DMA Mapping Fail.\n");
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return -ENOMEM;
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}
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req->req_pa = (ulong)pa;
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q_num = snic_select_wq(snic);
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spin_lock_irqsave(&snic->wq_lock[q_num], flags);
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desc_avail = snic_wqdesc_avail(snic, q_num, req->hdr.type);
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if (desc_avail <= 0) {
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dma_unmap_single(&snic->pdev->dev, pa, len, DMA_TO_DEVICE);
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req->req_pa = 0;
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spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
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atomic64_inc(&snic->s_stats.misc.wq_alloc_fail);
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SNIC_DBG("host = %d, WQ is Full\n", snic->shost->host_no);
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return -ENOMEM;
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}
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snic_queue_wq_eth_desc(&snic->wq[q_num], os_buf, pa, len, 0, 0, 1);
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/*
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* Update stats
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* note: when multi queue enabled, fw actv_reqs should be per queue.
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*/
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act_reqs = atomic64_inc_return(&fwstats->actv_reqs);
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spin_unlock_irqrestore(&snic->wq_lock[q_num], flags);
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if (act_reqs > atomic64_read(&fwstats->max_actv_reqs))
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atomic64_set(&fwstats->max_actv_reqs, act_reqs);
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return 0;
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} /* end of snic_queue_wq_desc() */
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/*
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* snic_handle_untagged_req: Adds snic specific requests to spl_cmd_list.
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* Purpose : Used during driver unload to clean up the requests.
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*/
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void
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snic_handle_untagged_req(struct snic *snic, struct snic_req_info *rqi)
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{
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unsigned long flags;
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INIT_LIST_HEAD(&rqi->list);
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spin_lock_irqsave(&snic->spl_cmd_lock, flags);
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list_add_tail(&rqi->list, &snic->spl_cmd_list);
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spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
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}
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/*
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* snic_req_init:
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* Allocates snic_req_info + snic_host_req + sgl data, and initializes.
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*/
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struct snic_req_info *
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snic_req_init(struct snic *snic, int sg_cnt)
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{
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u8 typ;
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struct snic_req_info *rqi = NULL;
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typ = (sg_cnt <= SNIC_REQ_CACHE_DFLT_SGL) ?
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SNIC_REQ_CACHE_DFLT_SGL : SNIC_REQ_CACHE_MAX_SGL;
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rqi = mempool_alloc(snic->req_pool[typ], GFP_ATOMIC);
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if (!rqi) {
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atomic64_inc(&snic->s_stats.io.alloc_fail);
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SNIC_HOST_ERR(snic->shost,
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"Failed to allocate memory from snic req pool id = %d\n",
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typ);
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return rqi;
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}
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memset(rqi, 0, sizeof(*rqi));
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rqi->rq_pool_type = typ;
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rqi->start_time = jiffies;
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rqi->req = (struct snic_host_req *) (rqi + 1);
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rqi->req_len = sizeof(struct snic_host_req);
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rqi->snic = snic;
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rqi->req = (struct snic_host_req *)(rqi + 1);
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if (sg_cnt == 0)
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goto end;
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rqi->req_len += (sg_cnt * sizeof(struct snic_sg_desc));
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if (sg_cnt > atomic64_read(&snic->s_stats.io.max_sgl))
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atomic64_set(&snic->s_stats.io.max_sgl, sg_cnt);
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SNIC_BUG_ON(sg_cnt > SNIC_MAX_SG_DESC_CNT);
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atomic64_inc(&snic->s_stats.io.sgl_cnt[sg_cnt - 1]);
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end:
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memset(rqi->req, 0, rqi->req_len);
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/* pre initialization of init_ctx to support req_to_rqi */
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rqi->req->hdr.init_ctx = (ulong) rqi;
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SNIC_SCSI_DBG(snic->shost, "Req_alloc:rqi = %p allocatd.\n", rqi);
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return rqi;
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} /* end of snic_req_init */
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/*
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* snic_abort_req_init : Inits abort request.
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*/
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struct snic_host_req *
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snic_abort_req_init(struct snic *snic, struct snic_req_info *rqi)
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{
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struct snic_host_req *req = NULL;
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SNIC_BUG_ON(!rqi);
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/* If abort to be issued second time, then reuse */
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if (rqi->abort_req)
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return rqi->abort_req;
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req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
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if (!req) {
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SNIC_HOST_ERR(snic->shost, "abts:Failed to alloc tm req.\n");
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WARN_ON_ONCE(1);
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return NULL;
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}
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rqi->abort_req = req;
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memset(req, 0, sizeof(struct snic_host_req));
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/* pre initialization of init_ctx to support req_to_rqi */
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req->hdr.init_ctx = (ulong) rqi;
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return req;
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} /* end of snic_abort_req_init */
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/*
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* snic_dr_req_init : Inits device reset req
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*/
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struct snic_host_req *
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snic_dr_req_init(struct snic *snic, struct snic_req_info *rqi)
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{
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struct snic_host_req *req = NULL;
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SNIC_BUG_ON(!rqi);
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req = mempool_alloc(snic->req_pool[SNIC_REQ_TM_CACHE], GFP_ATOMIC);
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if (!req) {
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SNIC_HOST_ERR(snic->shost, "dr:Failed to alloc tm req.\n");
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WARN_ON_ONCE(1);
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return NULL;
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}
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SNIC_BUG_ON(rqi->dr_req != NULL);
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rqi->dr_req = req;
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memset(req, 0, sizeof(struct snic_host_req));
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/* pre initialization of init_ctx to support req_to_rqi */
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req->hdr.init_ctx = (ulong) rqi;
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return req;
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} /* end of snic_dr_req_init */
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/* frees snic_req_info and snic_host_req */
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void
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snic_req_free(struct snic *snic, struct snic_req_info *rqi)
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{
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SNIC_BUG_ON(rqi->req == rqi->abort_req);
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SNIC_BUG_ON(rqi->req == rqi->dr_req);
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SNIC_BUG_ON(rqi->sge_va != 0);
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SNIC_SCSI_DBG(snic->shost,
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"Req_free:rqi %p:ioreq %p:abt %p:dr %p\n",
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rqi, rqi->req, rqi->abort_req, rqi->dr_req);
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if (rqi->abort_req) {
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if (rqi->abort_req->req_pa)
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dma_unmap_single(&snic->pdev->dev,
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rqi->abort_req->req_pa,
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sizeof(struct snic_host_req),
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DMA_TO_DEVICE);
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mempool_free(rqi->abort_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
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}
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if (rqi->dr_req) {
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if (rqi->dr_req->req_pa)
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dma_unmap_single(&snic->pdev->dev,
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rqi->dr_req->req_pa,
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sizeof(struct snic_host_req),
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DMA_TO_DEVICE);
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mempool_free(rqi->dr_req, snic->req_pool[SNIC_REQ_TM_CACHE]);
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}
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if (rqi->req->req_pa)
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dma_unmap_single(&snic->pdev->dev,
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rqi->req->req_pa,
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rqi->req_len,
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DMA_TO_DEVICE);
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mempool_free(rqi, snic->req_pool[rqi->rq_pool_type]);
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}
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void
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snic_pci_unmap_rsp_buf(struct snic *snic, struct snic_req_info *rqi)
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{
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struct snic_sg_desc *sgd;
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sgd = req_to_sgl(rqi_to_req(rqi));
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SNIC_BUG_ON(sgd[0].addr == 0);
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dma_unmap_single(&snic->pdev->dev,
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le64_to_cpu(sgd[0].addr),
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le32_to_cpu(sgd[0].len),
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DMA_FROM_DEVICE);
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}
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|
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/*
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* snic_free_all_untagged_reqs: Walks through untagged reqs and frees them.
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*/
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void
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snic_free_all_untagged_reqs(struct snic *snic)
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{
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struct snic_req_info *rqi;
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struct list_head *cur, *nxt;
|
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unsigned long flags;
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|
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spin_lock_irqsave(&snic->spl_cmd_lock, flags);
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list_for_each_safe(cur, nxt, &snic->spl_cmd_list) {
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rqi = list_entry(cur, struct snic_req_info, list);
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list_del_init(&rqi->list);
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if (rqi->sge_va) {
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snic_pci_unmap_rsp_buf(snic, rqi);
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kfree((void *)rqi->sge_va);
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rqi->sge_va = 0;
|
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}
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|
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snic_req_free(snic, rqi);
|
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}
|
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spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
|
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}
|
|
|
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/*
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* snic_release_untagged_req : Unlinks the untagged req and frees it.
|
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*/
|
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void
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snic_release_untagged_req(struct snic *snic, struct snic_req_info *rqi)
|
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{
|
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unsigned long flags;
|
|
|
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spin_lock_irqsave(&snic->snic_lock, flags);
|
|
if (snic->in_remove) {
|
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spin_unlock_irqrestore(&snic->snic_lock, flags);
|
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goto end;
|
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}
|
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spin_unlock_irqrestore(&snic->snic_lock, flags);
|
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|
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spin_lock_irqsave(&snic->spl_cmd_lock, flags);
|
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if (list_empty(&rqi->list)) {
|
|
spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
|
|
goto end;
|
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}
|
|
list_del_init(&rqi->list);
|
|
spin_unlock_irqrestore(&snic->spl_cmd_lock, flags);
|
|
snic_req_free(snic, rqi);
|
|
|
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end:
|
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return;
|
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}
|
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|
|
/* dump buf in hex fmt */
|
|
void
|
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snic_hex_dump(char *pfx, char *data, int len)
|
|
{
|
|
SNIC_INFO("%s Dumping Data of Len = %d\n", pfx, len);
|
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print_hex_dump_bytes(pfx, DUMP_PREFIX_NONE, data, len);
|
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}
|
|
|
|
#define LINE_BUFSZ 128 /* for snic_print_desc fn */
|
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static void
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snic_dump_desc(const char *fn, char *os_buf, int len)
|
|
{
|
|
struct snic_host_req *req = (struct snic_host_req *) os_buf;
|
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struct snic_fw_req *fwreq = (struct snic_fw_req *) os_buf;
|
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struct snic_req_info *rqi = NULL;
|
|
char line[LINE_BUFSZ] = { '\0' };
|
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char *cmd_str = NULL;
|
|
|
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if (req->hdr.type >= SNIC_RSP_REPORT_TGTS_CMPL)
|
|
rqi = (struct snic_req_info *) fwreq->hdr.init_ctx;
|
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else
|
|
rqi = (struct snic_req_info *) req->hdr.init_ctx;
|
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|
|
SNIC_BUG_ON(rqi == NULL || rqi->req == NULL);
|
|
switch (req->hdr.type) {
|
|
case SNIC_REQ_REPORT_TGTS:
|
|
cmd_str = "report-tgt : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_REQ_REPORT_TGTS :");
|
|
break;
|
|
|
|
case SNIC_REQ_ICMND:
|
|
cmd_str = "icmnd : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_REQ_ICMND : 0x%x :",
|
|
req->u.icmnd.cdb[0]);
|
|
break;
|
|
|
|
case SNIC_REQ_ITMF:
|
|
cmd_str = "itmf : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_REQ_ITMF :");
|
|
break;
|
|
|
|
case SNIC_REQ_HBA_RESET:
|
|
cmd_str = "hba reset :";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_REQ_HBA_RESET :");
|
|
break;
|
|
|
|
case SNIC_REQ_EXCH_VER:
|
|
cmd_str = "exch ver : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_REQ_EXCH_VER :");
|
|
break;
|
|
|
|
case SNIC_REQ_TGT_INFO:
|
|
cmd_str = "tgt info : ";
|
|
break;
|
|
|
|
case SNIC_RSP_REPORT_TGTS_CMPL:
|
|
cmd_str = "report tgt cmpl : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_RSP_REPORT_TGTS_CMPL :");
|
|
break;
|
|
|
|
case SNIC_RSP_ICMND_CMPL:
|
|
cmd_str = "icmnd_cmpl : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_RSP_ICMND_CMPL : 0x%x :",
|
|
rqi->req->u.icmnd.cdb[0]);
|
|
break;
|
|
|
|
case SNIC_RSP_ITMF_CMPL:
|
|
cmd_str = "itmf_cmpl : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_RSP_ITMF_CMPL :");
|
|
break;
|
|
|
|
case SNIC_RSP_HBA_RESET_CMPL:
|
|
cmd_str = "hba_reset_cmpl : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_RSP_HBA_RESET_CMPL :");
|
|
break;
|
|
|
|
case SNIC_RSP_EXCH_VER_CMPL:
|
|
cmd_str = "exch_ver_cmpl : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_RSP_EXCH_VER_CMPL :");
|
|
break;
|
|
|
|
case SNIC_MSG_ACK:
|
|
cmd_str = "msg ack : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_MSG_ACK :");
|
|
break;
|
|
|
|
case SNIC_MSG_ASYNC_EVNOTIFY:
|
|
cmd_str = "async notify : ";
|
|
snprintf(line, LINE_BUFSZ, "SNIC_MSG_ASYNC_EVNOTIFY :");
|
|
break;
|
|
|
|
default:
|
|
cmd_str = "unknown : ";
|
|
SNIC_BUG_ON(1);
|
|
break;
|
|
}
|
|
|
|
SNIC_INFO("%s:%s >>cmndid=%x:sg_cnt = %x:status = %x:ctx = %lx.\n",
|
|
fn, line, req->hdr.cmnd_id, req->hdr.sg_cnt, req->hdr.status,
|
|
req->hdr.init_ctx);
|
|
|
|
/* Enable it, to dump byte stream */
|
|
if (snic_log_level & 0x20)
|
|
snic_hex_dump(cmd_str, os_buf, len);
|
|
} /* end of __snic_print_desc */
|
|
|
|
void
|
|
snic_print_desc(const char *fn, char *os_buf, int len)
|
|
{
|
|
if (snic_log_level & SNIC_DESC_LOGGING)
|
|
snic_dump_desc(fn, os_buf, len);
|
|
}
|
|
|
|
void
|
|
snic_calc_io_process_time(struct snic *snic, struct snic_req_info *rqi)
|
|
{
|
|
u64 duration;
|
|
|
|
duration = jiffies - rqi->start_time;
|
|
|
|
if (duration > atomic64_read(&snic->s_stats.io.max_time))
|
|
atomic64_set(&snic->s_stats.io.max_time, duration);
|
|
}
|