diff options
Diffstat (limited to 'drivers/scsi/snic/snic_main.c')
| -rw-r--r-- | drivers/scsi/snic/snic_main.c | 1012 |
1 files changed, 1012 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_main.c b/drivers/scsi/snic/snic_main.c new file mode 100644 index 000000000..14f4ce665 --- /dev/null +++ b/drivers/scsi/snic/snic_main.c @@ -0,0 +1,1012 @@ +/* + * 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) +{ + struct snic *snic = shost_priv(sdev->host); + int qsz = 0; + + qsz = min_t(u32, qdepth, SNIC_MAX_QUEUE_DEPTH); + if (qsz < sdev->queue_depth) + atomic64_inc(&snic->s_stats.misc.qsz_rampdown); + else if (qsz > sdev->queue_depth) + atomic64_inc(&snic->s_stats.misc.qsz_rampup); + + atomic64_set(&snic->s_stats.misc.last_qsz, sdev->queue_depth); + + scsi_change_queue_depth(sdev, qsz); + + 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, + .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 */ + snic_stats_debugfs_init(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 = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(43)); + if (ret) { + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (ret) { + SNIC_HOST_ERR(shost, + "No Usable DMA Configuration, 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"); + + ret = -ENOMEM; + 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"); + + ret = -ENOMEM; + 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"); + + ret = -ENOMEM; + 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; + } + + 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]); + + /* 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; + } + + /* + * 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_get_conf; + } + + snic_set_state(snic, SNIC_ONLINE); + + 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: + svnic_dev_notify_unset(snic->vdev); + + 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_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 */ + snic_debugfs_init(); + + /* 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>"); |