- 根目录:
- drivers
- scsi
- snic
- snic_main.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/module.h>
#include <linux/mempool.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include "snic.h"
#include "snic_fwint.h"
#define PCI_DEVICE_ID_CISCO_SNIC 0x0046
/* Supported devices by snic module */
static struct pci_device_id snic_id_table[] = {
{PCI_DEVICE(0x1137, PCI_DEVICE_ID_CISCO_SNIC) },
{ 0, } /* end of table */
};
unsigned int snic_log_level = 0x0;
module_param(snic_log_level, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(snic_log_level, "bitmask for snic logging levels");
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
unsigned int snic_trace_max_pages = 16;
module_param(snic_trace_max_pages, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(snic_trace_max_pages,
"Total allocated memory pages for snic trace buffer");
#endif
unsigned int snic_max_qdepth = SNIC_DFLT_QUEUE_DEPTH;
module_param(snic_max_qdepth, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(snic_max_qdepth, "Queue depth to report for each LUN");
/*
* snic_slave_alloc : callback function to SCSI Mid Layer, called on
* scsi device initialization.
*/
static int
snic_slave_alloc(struct scsi_device *sdev)
{
struct snic_tgt *tgt = starget_to_tgt(scsi_target(sdev));
if (!tgt || snic_tgt_chkready(tgt))
return -ENXIO;
return 0;
}
/*
* snic_slave_configure : callback function to SCSI Mid Layer, called on
* scsi device initialization.
*/
static int
snic_slave_configure(struct scsi_device *sdev)
{
struct snic *snic = shost_priv(sdev->host);
u32 qdepth = 0, max_ios = 0;
int tmo = SNIC_DFLT_CMD_TIMEOUT * HZ;
/* Set Queue Depth */
max_ios = snic_max_qdepth;
qdepth = min_t(u32, max_ios, SNIC_MAX_QUEUE_DEPTH);
scsi_change_queue_depth(sdev, qdepth);
if (snic->fwinfo.io_tmo > 1)
tmo = snic->fwinfo.io_tmo * HZ;
/* FW requires extended timeouts */
blk_queue_rq_timeout(sdev->request_queue, tmo);
return 0;
}
static int
snic_change_queue_depth(struct scsi_device *sdev, int qdepth)
{
int qsz = 0;
qsz = min_t(u32, qdepth, SNIC_MAX_QUEUE_DEPTH);
scsi_change_queue_depth(sdev, qsz);
SNIC_INFO("QDepth Changed to %d\n", sdev->queue_depth);
return sdev->queue_depth;
}
static struct scsi_host_template snic_host_template = {
.module = THIS_MODULE,
.name = SNIC_DRV_NAME,
.queuecommand = snic_queuecommand,
.eh_abort_handler = snic_abort_cmd,
.eh_device_reset_handler = snic_device_reset,
.eh_host_reset_handler = snic_host_reset,
.slave_alloc = snic_slave_alloc,
.slave_configure = snic_slave_configure,
.change_queue_depth = snic_change_queue_depth,
.this_id = -1,
.cmd_per_lun = SNIC_DFLT_QUEUE_DEPTH,
.can_queue = SNIC_MAX_IO_REQ,
.use_clustering = ENABLE_CLUSTERING,
.sg_tablesize = SNIC_MAX_SG_DESC_CNT,
.max_sectors = 0x800,
.shost_attrs = snic_attrs,
.track_queue_depth = 1,
.cmd_size = sizeof(struct snic_internal_io_state),
.proc_name = "snic_scsi",
};
/*
* snic_handle_link_event : Handles link events such as link up/down/error
*/
void
snic_handle_link_event(struct snic *snic)
{
unsigned long flags;
spin_lock_irqsave(&snic->snic_lock, flags);
if (snic->stop_link_events) {
spin_unlock_irqrestore(&snic->snic_lock, flags);
return;
}
spin_unlock_irqrestore(&snic->snic_lock, flags);
queue_work(snic_glob->event_q, &snic->link_work);
} /* end of snic_handle_link_event */
/*
* snic_notify_set : sets notification area
* This notification area is to receive events from fw
* Note: snic supports only MSIX interrupts, in which we can just call
* svnic_dev_notify_set directly
*/
static int
snic_notify_set(struct snic *snic)
{
int ret = 0;
enum vnic_dev_intr_mode intr_mode;
intr_mode = svnic_dev_get_intr_mode(snic->vdev);
if (intr_mode == VNIC_DEV_INTR_MODE_MSIX) {
ret = svnic_dev_notify_set(snic->vdev, SNIC_MSIX_ERR_NOTIFY);
} else {
SNIC_HOST_ERR(snic->shost,
"Interrupt mode should be setup before devcmd notify set %d\n",
intr_mode);
ret = -1;
}
return ret;
} /* end of snic_notify_set */
/*
* snic_dev_wait : polls vnic open status.
*/
static int
snic_dev_wait(struct vnic_dev *vdev,
int (*start)(struct vnic_dev *, int),
int (*finished)(struct vnic_dev *, int *),
int arg)
{
unsigned long time;
int ret, done;
int retry_cnt = 0;
ret = start(vdev, arg);
if (ret)
return ret;
/*
* Wait for func to complete...2 seconds max.
*
* Sometimes schedule_timeout_uninterruptible take long time
* to wakeup, which results skipping retry. The retry counter
* ensures to retry at least two times.
*/
time = jiffies + (HZ * 2);
do {
ret = finished(vdev, &done);
if (ret)
return ret;
if (done)
return 0;
schedule_timeout_uninterruptible(HZ/10);
++retry_cnt;
} while (time_after(time, jiffies) || (retry_cnt < 3));
return -ETIMEDOUT;
} /* end of snic_dev_wait */
/*
* snic_cleanup: called by snic_remove
* Stops the snic device, masks all interrupts, Completed CQ entries are
* drained. Posted WQ/RQ/Copy-WQ entries are cleanup
*/
static int
snic_cleanup(struct snic *snic)
{
unsigned int i;
int ret;
svnic_dev_disable(snic->vdev);
for (i = 0; i < snic->intr_count; i++)
svnic_intr_mask(&snic->intr[i]);
for (i = 0; i < snic->wq_count; i++) {
ret = svnic_wq_disable(&snic->wq[i]);
if (ret)
return ret;
}
/* Clean up completed IOs */
snic_fwcq_cmpl_handler(snic, -1);
snic_wq_cmpl_handler(snic, -1);
/* Clean up the IOs that have not completed */
for (i = 0; i < snic->wq_count; i++)
svnic_wq_clean(&snic->wq[i], snic_free_wq_buf);
for (i = 0; i < snic->cq_count; i++)
svnic_cq_clean(&snic->cq[i]);
for (i = 0; i < snic->intr_count; i++)
svnic_intr_clean(&snic->intr[i]);
/* Cleanup snic specific requests */
snic_free_all_untagged_reqs(snic);
/* Cleanup Pending SCSI commands */
snic_shutdown_scsi_cleanup(snic);
for (i = 0; i < SNIC_REQ_MAX_CACHES; i++)
mempool_destroy(snic->req_pool[i]);
return 0;
} /* end of snic_cleanup */
static void
snic_iounmap(struct snic *snic)
{
if (snic->bar0.vaddr)
iounmap(snic->bar0.vaddr);
}
/*
* snic_vdev_open_done : polls for svnic_dev_open cmd completion.
*/
static int
snic_vdev_open_done(struct vnic_dev *vdev, int *done)
{
struct snic *snic = svnic_dev_priv(vdev);
int ret;
int nretries = 5;
do {
ret = svnic_dev_open_done(vdev, done);
if (ret == 0)
break;
SNIC_HOST_INFO(snic->shost, "VNIC_DEV_OPEN Timedout.\n");
} while (nretries--);
return ret;
} /* end of snic_vdev_open_done */
/*
* snic_add_host : registers scsi host with ML
*/
static int
snic_add_host(struct Scsi_Host *shost, struct pci_dev *pdev)
{
int ret = 0;
ret = scsi_add_host(shost, &pdev->dev);
if (ret) {
SNIC_HOST_ERR(shost,
"snic: scsi_add_host failed. %d\n",
ret);
return ret;
}
SNIC_BUG_ON(shost->work_q != NULL);
snprintf(shost->work_q_name, sizeof(shost->work_q_name), "scsi_wq_%d",
shost->host_no);
shost->work_q = create_singlethread_workqueue(shost->work_q_name);
if (!shost->work_q) {
SNIC_HOST_ERR(shost, "Failed to Create ScsiHost wq.\n");
ret = -ENOMEM;
}
return ret;
} /* end of snic_add_host */
static void
snic_del_host(struct Scsi_Host *shost)
{
if (!shost->work_q)
return;
destroy_workqueue(shost->work_q);
shost->work_q = NULL;
scsi_remove_host(shost);
}
int
snic_get_state(struct snic *snic)
{
return atomic_read(&snic->state);
}
void
snic_set_state(struct snic *snic, enum snic_state state)
{
SNIC_HOST_INFO(snic->shost, "snic state change from %s to %s\n",
snic_state_to_str(snic_get_state(snic)),
snic_state_to_str(state));
atomic_set(&snic->state, state);
}
/*
* snic_probe : Initialize the snic interface.
*/
static int
snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct Scsi_Host *shost;
struct snic *snic;
mempool_t *pool;
unsigned long flags;
u32 max_ios = 0;
int ret, i;
/* Device Information */
SNIC_INFO("snic device %4x:%4x:%4x:%4x: ",
pdev->vendor, pdev->device, pdev->subsystem_vendor,
pdev->subsystem_device);
SNIC_INFO("snic device bus %x: slot %x: fn %x\n",
pdev->bus->number, PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
/*
* Allocate SCSI Host and setup association between host, and snic
*/
shost = scsi_host_alloc(&snic_host_template, sizeof(struct snic));
if (!shost) {
SNIC_ERR("Unable to alloc scsi_host\n");
ret = -ENOMEM;
goto prob_end;
}
snic = shost_priv(shost);
snic->shost = shost;
snprintf(snic->name, sizeof(snic->name) - 1, "%s%d", SNIC_DRV_NAME,
shost->host_no);
SNIC_HOST_INFO(shost,
"snic%d = %p shost = %p device bus %x: slot %x: fn %x\n",
shost->host_no, snic, shost, pdev->bus->number,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
/* Per snic debugfs init */
ret = snic_stats_debugfs_init(snic);
if (ret) {
SNIC_HOST_ERR(snic->shost,
"Failed to initialize debugfs stats\n");
snic_stats_debugfs_remove(snic);
}
#endif
/* Setup PCI Resources */
pci_set_drvdata(pdev, snic);
snic->pdev = pdev;
ret = pci_enable_device(pdev);
if (ret) {
SNIC_HOST_ERR(shost,
"Cannot enable PCI Resources, aborting : %d\n",
ret);
goto err_free_snic;
}
ret = pci_request_regions(pdev, SNIC_DRV_NAME);
if (ret) {
SNIC_HOST_ERR(shost,
"Cannot obtain PCI Resources, aborting : %d\n",
ret);
goto err_pci_disable;
}
pci_set_master(pdev);
/*
* Query PCI Controller on system for DMA addressing
* limitation for the device. Try 43-bit first, and
* fail to 32-bit.
*/
ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(43));
if (ret) {
ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (ret) {
SNIC_HOST_ERR(shost,
"No Usable DMA Configuration, aborting %d\n",
ret);
goto err_rel_regions;
}
ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (ret) {
SNIC_HOST_ERR(shost,
"Unable to obtain 32-bit DMA for consistent allocations, aborting: %d\n",
ret);
goto err_rel_regions;
}
} else {
ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(43));
if (ret) {
SNIC_HOST_ERR(shost,
"Unable to obtain 43-bit DMA for consistent allocations. aborting: %d\n",
ret);
goto err_rel_regions;
}
}
/* Map vNIC resources from BAR0 */
if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
SNIC_HOST_ERR(shost, "BAR0 not memory mappable aborting.\n");
ret = -ENODEV;
goto err_rel_regions;
}
snic->bar0.vaddr = pci_iomap(pdev, 0, 0);
if (!snic->bar0.vaddr) {
SNIC_HOST_ERR(shost,
"Cannot memory map BAR0 res hdr aborting.\n");
ret = -ENODEV;
goto err_rel_regions;
}
snic->bar0.bus_addr = pci_resource_start(pdev, 0);
snic->bar0.len = pci_resource_len(pdev, 0);
SNIC_BUG_ON(snic->bar0.bus_addr == 0);
/* Devcmd2 Resource Allocation and Initialization */
snic->vdev = svnic_dev_alloc_discover(NULL, snic, pdev, &snic->bar0, 1);
if (!snic->vdev) {
SNIC_HOST_ERR(shost, "vNIC Resource Discovery Failed.\n");
ret = -ENODEV;
goto err_iounmap;
}
ret = svnic_dev_cmd_init(snic->vdev, 0);
if (ret) {
SNIC_HOST_INFO(shost, "Devcmd2 Init Failed. err = %d\n", ret);
goto err_vnic_unreg;
}
ret = snic_dev_wait(snic->vdev, svnic_dev_open, snic_vdev_open_done, 0);
if (ret) {
SNIC_HOST_ERR(shost,
"vNIC dev open failed, aborting. %d\n",
ret);
goto err_vnic_unreg;
}
ret = svnic_dev_init(snic->vdev, 0);
if (ret) {
SNIC_HOST_ERR(shost,
"vNIC dev init failed. aborting. %d\n",
ret);
goto err_dev_close;
}
/* Get vNIC information */
ret = snic_get_vnic_config(snic);
if (ret) {
SNIC_HOST_ERR(shost,
"Get vNIC configuration failed, aborting. %d\n",
ret);
goto err_dev_close;
}
/* Configure Maximum Outstanding IO reqs */
max_ios = snic->config.io_throttle_count;
if (max_ios != SNIC_UCSM_DFLT_THROTTLE_CNT_BLD)
shost->can_queue = min_t(u32, SNIC_MAX_IO_REQ,
max_t(u32, SNIC_MIN_IO_REQ, max_ios));
snic->max_tag_id = shost->can_queue;
shost->max_lun = snic->config.luns_per_tgt;
shost->max_id = SNIC_MAX_TARGET;
shost->max_cmd_len = MAX_COMMAND_SIZE; /*defined in scsi_cmnd.h*/
snic_get_res_counts(snic);
/*
* Assumption: Only MSIx is supported
*/
ret = snic_set_intr_mode(snic);
if (ret) {
SNIC_HOST_ERR(shost,
"Failed to set intr mode aborting. %d\n",
ret);
goto err_dev_close;
}
ret = snic_alloc_vnic_res(snic);
if (ret) {
SNIC_HOST_ERR(shost,
"Failed to alloc vNIC resources aborting. %d\n",
ret);
goto err_clear_intr;
}
/* Initialize specific lists */
INIT_LIST_HEAD(&snic->list);
/*
* spl_cmd_list for maintaining snic specific cmds
* such as EXCH_VER_REQ, REPORT_TARGETS etc
*/
INIT_LIST_HEAD(&snic->spl_cmd_list);
spin_lock_init(&snic->spl_cmd_lock);
/* initialize all snic locks */
spin_lock_init(&snic->snic_lock);
for (i = 0; i < SNIC_WQ_MAX; i++)
spin_lock_init(&snic->wq_lock[i]);
for (i = 0; i < SNIC_IO_LOCKS; i++)
spin_lock_init(&snic->io_req_lock[i]);
pool = mempool_create_slab_pool(2,
snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
if (!pool) {
SNIC_HOST_ERR(shost, "dflt sgl pool creation failed\n");
goto err_free_res;
}
snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL] = pool;
pool = mempool_create_slab_pool(2,
snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
if (!pool) {
SNIC_HOST_ERR(shost, "max sgl pool creation failed\n");
goto err_free_dflt_sgl_pool;
}
snic->req_pool[SNIC_REQ_CACHE_MAX_SGL] = pool;
pool = mempool_create_slab_pool(2,
snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
if (!pool) {
SNIC_HOST_ERR(shost, "snic tmreq info pool creation failed.\n");
goto err_free_max_sgl_pool;
}
snic->req_pool[SNIC_REQ_TM_CACHE] = pool;
/* Initialize snic state */
atomic_set(&snic->state, SNIC_INIT);
atomic_set(&snic->ios_inflight, 0);
/* Setup notification buffer area */
ret = snic_notify_set(snic);
if (ret) {
SNIC_HOST_ERR(shost,
"Failed to alloc notify buffer aborting. %d\n",
ret);
goto err_free_tmreq_pool;
}
/*
* Initialization done with PCI system, hardware, firmware.
* Add shost to SCSI
*/
ret = snic_add_host(shost, pdev);
if (ret) {
SNIC_HOST_ERR(shost,
"Adding scsi host Failed ... exiting. %d\n",
ret);
goto err_notify_unset;
}
spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
list_add_tail(&snic->list, &snic_glob->snic_list);
spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);
snic_disc_init(&snic->disc);
INIT_WORK(&snic->tgt_work, snic_handle_tgt_disc);
INIT_WORK(&snic->disc_work, snic_handle_disc);
INIT_WORK(&snic->link_work, snic_handle_link);
/* Enable all queues */
for (i = 0; i < snic->wq_count; i++)
svnic_wq_enable(&snic->wq[i]);
ret = svnic_dev_enable_wait(snic->vdev);
if (ret) {
SNIC_HOST_ERR(shost,
"vNIC dev enable failed w/ error %d\n",
ret);
goto err_vdev_enable;
}
ret = snic_request_intr(snic);
if (ret) {
SNIC_HOST_ERR(shost, "Unable to request irq. %d\n", ret);
goto err_req_intr;
}
for (i = 0; i < snic->intr_count; i++)
svnic_intr_unmask(&snic->intr[i]);
snic_set_state(snic, SNIC_ONLINE);
/* Get snic params */
ret = snic_get_conf(snic);
if (ret) {
SNIC_HOST_ERR(shost,
"Failed to get snic io config from FW w err %d\n",
ret);
goto err_get_conf;
}
ret = snic_disc_start(snic);
if (ret) {
SNIC_HOST_ERR(shost, "snic_probe:Discovery Failed w err = %d\n",
ret);
goto err_get_conf;
}
SNIC_HOST_INFO(shost, "SNIC Device Probe Successful.\n");
return 0;
err_get_conf:
snic_free_all_untagged_reqs(snic);
for (i = 0; i < snic->intr_count; i++)
svnic_intr_mask(&snic->intr[i]);
snic_free_intr(snic);
err_req_intr:
svnic_dev_disable(snic->vdev);
err_vdev_enable:
for (i = 0; i < snic->wq_count; i++) {
int rc = 0;
rc = svnic_wq_disable(&snic->wq[i]);
if (rc) {
SNIC_HOST_ERR(shost,
"WQ Disable Failed w/ err = %d\n", rc);
break;
}
}
snic_del_host(snic->shost);
err_notify_unset:
svnic_dev_notify_unset(snic->vdev);
err_free_tmreq_pool:
mempool_destroy(snic->req_pool[SNIC_REQ_TM_CACHE]);
err_free_max_sgl_pool:
mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_MAX_SGL]);
err_free_dflt_sgl_pool:
mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL]);
err_free_res:
snic_free_vnic_res(snic);
err_clear_intr:
snic_clear_intr_mode(snic);
err_dev_close:
svnic_dev_close(snic->vdev);
err_vnic_unreg:
svnic_dev_unregister(snic->vdev);
err_iounmap:
snic_iounmap(snic);
err_rel_regions:
pci_release_regions(pdev);
err_pci_disable:
pci_disable_device(pdev);
err_free_snic:
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
snic_stats_debugfs_remove(snic);
#endif
scsi_host_put(shost);
pci_set_drvdata(pdev, NULL);
prob_end:
SNIC_INFO("sNIC device : bus %d: slot %d: fn %d Registration Failed.\n",
pdev->bus->number, PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
return ret;
} /* end of snic_probe */
/*
* snic_remove : invoked on unbinding the interface to cleanup the
* resources allocated in snic_probe on initialization.
*/
static void
snic_remove(struct pci_dev *pdev)
{
struct snic *snic = pci_get_drvdata(pdev);
unsigned long flags;
if (!snic) {
SNIC_INFO("sNIC dev: bus %d slot %d fn %d snic inst is null.\n",
pdev->bus->number, PCI_SLOT(pdev->devfn),
PCI_FUNC(pdev->devfn));
return;
}
/*
* Mark state so that the workqueue thread stops forwarding
* received frames and link events. ISR and other threads
* that can queue work items will also stop creating work
* items on the snic workqueue
*/
snic_set_state(snic, SNIC_OFFLINE);
spin_lock_irqsave(&snic->snic_lock, flags);
snic->stop_link_events = 1;
spin_unlock_irqrestore(&snic->snic_lock, flags);
flush_workqueue(snic_glob->event_q);
snic_disc_term(snic);
spin_lock_irqsave(&snic->snic_lock, flags);
snic->in_remove = 1;
spin_unlock_irqrestore(&snic->snic_lock, flags);
/*
* This stops the snic device, masks all interrupts, Completed
* CQ entries are drained. Posted WQ/RQ/Copy-WQ entries are
* cleanup
*/
snic_cleanup(snic);
spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
list_del(&snic->list);
spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);
snic_tgt_del_all(snic);
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
snic_stats_debugfs_remove(snic);
#endif
snic_del_host(snic->shost);
svnic_dev_notify_unset(snic->vdev);
snic_free_intr(snic);
snic_free_vnic_res(snic);
snic_clear_intr_mode(snic);
svnic_dev_close(snic->vdev);
svnic_dev_unregister(snic->vdev);
snic_iounmap(snic);
pci_release_regions(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
/* this frees Scsi_Host and snic memory (continuous chunk) */
scsi_host_put(snic->shost);
} /* end of snic_remove */
struct snic_global *snic_glob;
/*
* snic_global_data_init: Initialize SNIC Global Data
* Notes: All the global lists, variables should be part of global data
* this helps in debugging.
*/
static int
snic_global_data_init(void)
{
int ret = 0;
struct kmem_cache *cachep;
ssize_t len = 0;
snic_glob = kzalloc(sizeof(*snic_glob), GFP_KERNEL);
if (!snic_glob) {
SNIC_ERR("Failed to allocate Global Context.\n");
ret = -ENOMEM;
goto gdi_end;
}
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
/* Debugfs related Initialization */
/* Create debugfs entries for snic */
ret = snic_debugfs_init();
if (ret < 0) {
SNIC_ERR("Failed to create sysfs dir for tracing and stats.\n");
snic_debugfs_term();
/* continue even if it fails */
}
/* Trace related Initialization */
/* Allocate memory for trace buffer */
ret = snic_trc_init();
if (ret < 0) {
SNIC_ERR("Trace buffer init failed, SNIC tracing disabled\n");
snic_trc_free();
/* continue even if it fails */
}
#endif
INIT_LIST_HEAD(&snic_glob->snic_list);
spin_lock_init(&snic_glob->snic_list_lock);
/* Create a cache for allocation of snic_host_req+default size ESGLs */
len = sizeof(struct snic_req_info);
len += sizeof(struct snic_host_req) + sizeof(struct snic_dflt_sgl);
cachep = kmem_cache_create("snic_req_dfltsgl", len, SNIC_SG_DESC_ALIGN,
SLAB_HWCACHE_ALIGN, NULL);
if (!cachep) {
SNIC_ERR("Failed to create snic default sgl slab\n");
ret = -ENOMEM;
goto err_dflt_req_slab;
}
snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL] = cachep;
/* Create a cache for allocation of max size Extended SGLs */
len = sizeof(struct snic_req_info);
len += sizeof(struct snic_host_req) + sizeof(struct snic_max_sgl);
cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
SLAB_HWCACHE_ALIGN, NULL);
if (!cachep) {
SNIC_ERR("Failed to create snic max sgl slab\n");
ret = -ENOMEM;
goto err_max_req_slab;
}
snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL] = cachep;
len = sizeof(struct snic_host_req);
cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
SLAB_HWCACHE_ALIGN, NULL);
if (!cachep) {
SNIC_ERR("Failed to create snic tm req slab\n");
ret = -ENOMEM;
goto err_tmreq_slab;
}
snic_glob->req_cache[SNIC_REQ_TM_CACHE] = cachep;
/* snic_event queue */
snic_glob->event_q = create_singlethread_workqueue("snic_event_wq");
if (!snic_glob->event_q) {
SNIC_ERR("snic event queue create failed\n");
ret = -ENOMEM;
goto err_eventq;
}
return ret;
err_eventq:
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
err_tmreq_slab:
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
err_max_req_slab:
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
err_dflt_req_slab:
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
snic_trc_free();
snic_debugfs_term();
#endif
kfree(snic_glob);
snic_glob = NULL;
gdi_end:
return ret;
} /* end of snic_glob_init */
/*
* snic_global_data_cleanup : Frees SNIC Global Data
*/
static void
snic_global_data_cleanup(void)
{
SNIC_BUG_ON(snic_glob == NULL);
destroy_workqueue(snic_glob->event_q);
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
/* Freeing Trace Resources */
snic_trc_free();
/* Freeing Debugfs Resources */
snic_debugfs_term();
#endif
kfree(snic_glob);
snic_glob = NULL;
} /* end of snic_glob_cleanup */
static struct pci_driver snic_driver = {
.name = SNIC_DRV_NAME,
.id_table = snic_id_table,
.probe = snic_probe,
.remove = snic_remove,
};
static int __init
snic_init_module(void)
{
int ret = 0;
#ifndef __x86_64__
SNIC_INFO("SNIC Driver is supported only for x86_64 platforms!\n");
add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
#endif
SNIC_INFO("%s, ver %s\n", SNIC_DRV_DESCRIPTION, SNIC_DRV_VERSION);
ret = snic_global_data_init();
if (ret) {
SNIC_ERR("Failed to Initialize Global Data.\n");
return ret;
}
ret = pci_register_driver(&snic_driver);
if (ret < 0) {
SNIC_ERR("PCI driver register error\n");
goto err_pci_reg;
}
return ret;
err_pci_reg:
snic_global_data_cleanup();
return ret;
}
static void __exit
snic_cleanup_module(void)
{
pci_unregister_driver(&snic_driver);
snic_global_data_cleanup();
}
module_init(snic_init_module);
module_exit(snic_cleanup_module);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(SNIC_DRV_DESCRIPTION);
MODULE_VERSION(SNIC_DRV_VERSION);
MODULE_DEVICE_TABLE(pci, snic_id_table);
MODULE_AUTHOR("Narsimhulu Musini <nmusini@cisco.com>, "
"Sesidhar Baddela <sebaddel@cisco.com>");