linux-stable/drivers/scsi/snic/snic_io.c
Christoph Hellwig cecfed31fd scsi: snic: switch to generic DMA API
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>
2018-10-17 21:58:53 -04:00

569 lines
14 KiB
C

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