diff options
author | 2016-04-11 10:41:07 +0300 | |
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committer | 2016-04-13 08:17:18 +0300 | |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/scsi/snic/snic_ctl.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/scsi/snic/snic_ctl.c')
-rw-r--r-- | kernel/drivers/scsi/snic/snic_ctl.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/snic/snic_ctl.c b/kernel/drivers/scsi/snic/snic_ctl.c new file mode 100644 index 000000000..aebe75320 --- /dev/null +++ b/kernel/drivers/scsi/snic/snic_ctl.c @@ -0,0 +1,279 @@ +/* + * 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 <linux/ctype.h> + +#include "snic_io.h" +#include "snic.h" +#include "cq_enet_desc.h" +#include "snic_fwint.h" + +/* + * snic_handle_link : Handles link flaps. + */ +void +snic_handle_link(struct work_struct *work) +{ + struct snic *snic = container_of(work, struct snic, link_work); + + if (snic->config.xpt_type != SNIC_DAS) { + SNIC_HOST_INFO(snic->shost, "Link Event Received.\n"); + SNIC_ASSERT_NOT_IMPL(1); + + return; + } + + snic->link_status = svnic_dev_link_status(snic->vdev); + snic->link_down_cnt = svnic_dev_link_down_cnt(snic->vdev); + SNIC_HOST_INFO(snic->shost, "Link Event: Link %s.\n", + ((snic->link_status) ? "Up" : "Down")); +} + + +/* + * snic_ver_enc : Encodes version str to int + * version string is similar to netmask string + */ +static int +snic_ver_enc(const char *s) +{ + int v[4] = {0}; + int i = 0, x = 0; + char c; + const char *p = s; + + /* validate version string */ + if ((strlen(s) > 15) || (strlen(s) < 7)) + goto end; + + while ((c = *p++)) { + if (c == '.') { + i++; + continue; + } + + if (i > 4 || !isdigit(c)) + goto end; + + v[i] = v[i] * 10 + (c - '0'); + } + + /* validate sub version numbers */ + for (i = 3; i >= 0; i--) + if (v[i] > 0xff) + goto end; + + x |= (v[0] << 24) | v[1] << 16 | v[2] << 8 | v[3]; + +end: + if (x == 0) { + SNIC_ERR("Invalid version string [%s].\n", s); + + return -1; + } + + return x; +} /* end of snic_ver_enc */ + +/* + * snic_qeueue_exch_ver_req : + * + * Queues Exchange Version Request, to communicate host information + * in return, it gets firmware version details + */ +int +snic_queue_exch_ver_req(struct snic *snic) +{ + struct snic_req_info *rqi = NULL; + struct snic_host_req *req = NULL; + u32 ver = 0; + int ret = 0; + + SNIC_HOST_INFO(snic->shost, "Exch Ver Req Preparing...\n"); + + rqi = snic_req_init(snic, 0); + if (!rqi) { + SNIC_HOST_ERR(snic->shost, + "Queuing Exch Ver Req failed, err = %d\n", + ret); + + ret = -ENOMEM; + goto error; + } + + req = rqi_to_req(rqi); + + /* Initialize snic_host_req */ + snic_io_hdr_enc(&req->hdr, SNIC_REQ_EXCH_VER, 0, SCSI_NO_TAG, + snic->config.hid, 0, (ulong)rqi); + ver = snic_ver_enc(SNIC_DRV_VERSION); + req->u.exch_ver.drvr_ver = cpu_to_le32(ver); + req->u.exch_ver.os_type = cpu_to_le32(SNIC_OS_LINUX); + + snic_handle_untagged_req(snic, rqi); + + ret = snic_queue_wq_desc(snic, req, sizeof(*req)); + if (ret) { + snic_release_untagged_req(snic, rqi); + SNIC_HOST_ERR(snic->shost, + "Queuing Exch Ver Req failed, err = %d\n", + ret); + goto error; + } + + SNIC_HOST_INFO(snic->shost, "Exch Ver Req is issued. ret = %d\n", ret); + +error: + return ret; +} /* end of snic_queue_exch_ver_req */ + +/* + * snic_io_exch_ver_cmpl_handler + */ +int +snic_io_exch_ver_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq) +{ + struct snic_req_info *rqi = NULL; + struct snic_exch_ver_rsp *exv_cmpl = &fwreq->u.exch_ver_cmpl; + u8 typ, hdr_stat; + u32 cmnd_id, hid, max_sgs; + ulong ctx = 0; + unsigned long flags; + int ret = 0; + + SNIC_HOST_INFO(snic->shost, "Exch Ver Compl Received.\n"); + snic_io_hdr_dec(&fwreq->hdr, &typ, &hdr_stat, &cmnd_id, &hid, &ctx); + SNIC_BUG_ON(snic->config.hid != hid); + rqi = (struct snic_req_info *) ctx; + + if (hdr_stat) { + SNIC_HOST_ERR(snic->shost, + "Exch Ver Completed w/ err status %d\n", + hdr_stat); + + goto exch_cmpl_end; + } + + spin_lock_irqsave(&snic->snic_lock, flags); + snic->fwinfo.fw_ver = le32_to_cpu(exv_cmpl->version); + snic->fwinfo.hid = le32_to_cpu(exv_cmpl->hid); + snic->fwinfo.max_concur_ios = le32_to_cpu(exv_cmpl->max_concur_ios); + snic->fwinfo.max_sgs_per_cmd = le32_to_cpu(exv_cmpl->max_sgs_per_cmd); + snic->fwinfo.max_io_sz = le32_to_cpu(exv_cmpl->max_io_sz); + snic->fwinfo.max_tgts = le32_to_cpu(exv_cmpl->max_tgts); + snic->fwinfo.io_tmo = le16_to_cpu(exv_cmpl->io_timeout); + + SNIC_HOST_INFO(snic->shost, + "vers %u hid %u max_concur_ios %u max_sgs_per_cmd %u max_io_sz %u max_tgts %u fw tmo %u\n", + snic->fwinfo.fw_ver, + snic->fwinfo.hid, + snic->fwinfo.max_concur_ios, + snic->fwinfo.max_sgs_per_cmd, + snic->fwinfo.max_io_sz, + snic->fwinfo.max_tgts, + snic->fwinfo.io_tmo); + + SNIC_HOST_INFO(snic->shost, + "HBA Capabilities = 0x%x\n", + le32_to_cpu(exv_cmpl->hba_cap)); + + /* Updating SGList size */ + max_sgs = snic->fwinfo.max_sgs_per_cmd; + if (max_sgs && max_sgs < SNIC_MAX_SG_DESC_CNT) { + snic->shost->sg_tablesize = max_sgs; + SNIC_HOST_INFO(snic->shost, "Max SGs set to %d\n", + snic->shost->sg_tablesize); + } else if (max_sgs > snic->shost->sg_tablesize) { + SNIC_HOST_INFO(snic->shost, + "Target type %d Supports Larger Max SGList %d than driver's Max SG List %d.\n", + snic->config.xpt_type, max_sgs, + snic->shost->sg_tablesize); + } + + if (snic->shost->can_queue > snic->fwinfo.max_concur_ios) + snic->shost->can_queue = snic->fwinfo.max_concur_ios; + + snic->shost->max_sectors = snic->fwinfo.max_io_sz >> 9; + if (snic->fwinfo.wait) + complete(snic->fwinfo.wait); + + spin_unlock_irqrestore(&snic->snic_lock, flags); + +exch_cmpl_end: + snic_release_untagged_req(snic, rqi); + + SNIC_HOST_INFO(snic->shost, "Exch_cmpl Done, hdr_stat %d.\n", hdr_stat); + + return ret; +} /* end of snic_io_exch_ver_cmpl_handler */ + +/* + * snic_get_conf + * + * Synchronous call, and Retrieves snic params. + */ +int +snic_get_conf(struct snic *snic) +{ + DECLARE_COMPLETION_ONSTACK(wait); + unsigned long flags; + int ret; + int nr_retries = 3; + + SNIC_HOST_INFO(snic->shost, "Retrieving snic params.\n"); + spin_lock_irqsave(&snic->snic_lock, flags); + memset(&snic->fwinfo, 0, sizeof(snic->fwinfo)); + snic->fwinfo.wait = &wait; + spin_unlock_irqrestore(&snic->snic_lock, flags); + + /* Additional delay to handle HW Resource initialization. */ + msleep(50); + + /* + * Exch ver req can be ignored by FW, if HW Resource initialization + * is in progress, Hence retry. + */ + do { + ret = snic_queue_exch_ver_req(snic); + if (ret) + return ret; + + wait_for_completion_timeout(&wait, msecs_to_jiffies(2000)); + spin_lock_irqsave(&snic->snic_lock, flags); + ret = (snic->fwinfo.fw_ver != 0) ? 0 : -ETIMEDOUT; + if (ret) + SNIC_HOST_ERR(snic->shost, + "Failed to retrieve snic params,\n"); + + /* Unset fwinfo.wait, on success or on last retry */ + if (ret == 0 || nr_retries == 1) + snic->fwinfo.wait = NULL; + + spin_unlock_irqrestore(&snic->snic_lock, flags); + } while (ret && --nr_retries); + + return ret; +} /* end of snic_get_info */ |