Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030392AbVIITlM (ORCPT ); Fri, 9 Sep 2005 15:41:12 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030385AbVIITkb (ORCPT ); Fri, 9 Sep 2005 15:40:31 -0400 Received: from magic.adaptec.com ([216.52.22.17]:59846 "EHLO magic.adaptec.com") by vger.kernel.org with ESMTP id S1030386AbVIITkV (ORCPT ); Fri, 9 Sep 2005 15:40:21 -0400 Message-ID: <4321E51F.8040906@adaptec.com> Date: Fri, 09 Sep 2005 15:40:15 -0400 From: Luben Tuikov User-Agent: Mozilla Thunderbird 1.0.6 (X11/20050716) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Linux Kernel Mailing List , SCSI Mailing List Subject: [PATCH 2.6.13 5/14] sas-class: sas_discover.c Discover process (end devices) Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 09 Sep 2005 19:40:20.0319 (UTC) FILETIME=[5004D6F0:01C5B576] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 43777 Lines: 1590 Signed-off-by: Luben Tuikov diff -X linux-2.6.13/Documentation/dontdiff -Naur linux-2.6.13-orig/drivers/scsi/sas-class/sas_discover.c linux-2.6.13/drivers/scsi/sas-class/sas_discover.c --- linux-2.6.13-orig/drivers/scsi/sas-class/sas_discover.c 1969-12-31 19:00:00.000000000 -0500 +++ linux-2.6.13/drivers/scsi/sas-class/sas_discover.c 2005-09-09 11:14:29.000000000 -0400 @@ -0,0 +1,1577 @@ +/* + * Serial Attached SCSI (SAS) Discover process + * + * Copyright (C) 2005 Adaptec, Inc. All rights reserved. + * Copyright (C) 2005 Luben Tuikov + * + * This file is licensed under GPLv2. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * $Id: //depot/sas-class/sas_discover.c#130 $ + */ + +#include +#include +#include +#include +#include "sas_internal.h" +#include +#include + +/* ---------- Domain device attributes ---------- */ + +ssize_t dev_show_type(struct domain_device *dev, char *page) +{ + static const char *dev_type[] = { + "no device", + "end device", + "edge expander", + "fanout expander", + "host adapter", + "sata device", + "sata port multiplier", + "sata port multiplier port", + }; + return sprintf(page, "%s\n", dev_type[dev->dev_type]); +} + +ssize_t dev_show_iproto(struct domain_device *dev, char *page) +{ + return sas_show_proto(dev->iproto, page); +} + +ssize_t dev_show_tproto(struct domain_device *dev, char *page) +{ + return sas_show_proto(dev->tproto, page); +} + +ssize_t dev_show_sas_addr(struct domain_device *dev, char *page) +{ + return sprintf(page, "%llx\n", SAS_ADDR(dev->sas_addr)); +} + +ssize_t dev_show_linkrate(struct domain_device *dev, char *page) +{ + return sas_show_linkrate(dev->linkrate, page); +} + +ssize_t dev_show_min_linkrate(struct domain_device *dev, char *page) +{ + return sas_show_linkrate(dev->min_linkrate, page); +} + +ssize_t dev_show_max_linkrate(struct domain_device *dev, char *page) +{ + return sas_show_linkrate(dev->max_linkrate, page); +} + +ssize_t dev_show_pathways(struct domain_device *dev, char *page) +{ + return sprintf(page, "%d\n", dev->pathways); +} + +/* ---------- SATA specific sysfs ---------- */ + +static ssize_t sata_show_command_set(struct domain_device *dev, char *page) +{ + static const char *cs[] = { + "ATA", + "ATAPI", + }; + return sprintf(page, "%s\n", cs[dev->sata_dev.command_set]); +} + +static ssize_t sata_show_rps_resp(struct domain_device *dev, char *page) +{ + char *buf = page; + if ((dev->tproto & SAS_PROTO_STP) && + dev->sata_dev.rps_resp.frame_type == SMP_RESPONSE && + dev->sata_dev.rps_resp.function == SMP_REPORT_PHY_SATA && + dev->sata_dev.rps_resp.result == SMP_RESP_FUNC_ACC) { + int i = 0; + u8 *p = (u8 *) &dev->sata_dev.rps_resp; + for (i = 0; i < sizeof(struct smp_resp); i+=4, p+=4) { + buf += sprintf(buf, "%02x %02x %02x %02x\n", + *(p+0), *(p+1), *(p+2), *(p+3)); + } + } + return buf-page; +} + +static inline int show_chars(__le16 *p, int start, int words, char *page) +{ + int i; + char *buf = page; + + for (i = start; i < start+words; i++) { + u16 s = le16_to_cpu(p[i]); + char a = (s&0xFF00)>>8; + char b = s&0x00FF; + + if (a == 0) + break; + buf += sprintf(buf, "%c", a); + if (b == 0) + break; + buf += sprintf(buf, "%c", b); + + } + return buf-page; +} + +static ssize_t sata_show_serial_number(struct domain_device *dev, char *page) +{ + char *buf = page; + __le16 *identify_x = NULL; + + if (dev->sata_dev.command_set == ATA_COMMAND_SET) + identify_x = dev->sata_dev.identify_device; + else + identify_x = dev->sata_dev.identify_packet_device; + + if (identify_x && + (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT)) { + buf += show_chars(identify_x, 10, 10, buf); + buf += sprintf(buf, "\n"); + } + return buf-page; +} + +static ssize_t sata_show_firmware_rev(struct domain_device *dev, char *page) +{ + char *buf = page; + __le16 *identify_x = NULL; + + if (dev->sata_dev.command_set == ATA_COMMAND_SET) + identify_x = dev->sata_dev.identify_device; + else + identify_x = dev->sata_dev.identify_packet_device; + + if (identify_x && + (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT)) { + buf += show_chars(identify_x, 23, 4, buf); + buf += sprintf(buf, "\n"); + } + return buf-page; +} + +static ssize_t sata_show_model_number(struct domain_device *dev, char *page) +{ + char *buf = page; + __le16 *identify_x = NULL; + + if (dev->sata_dev.command_set == ATA_COMMAND_SET) + identify_x = dev->sata_dev.identify_device; + else + identify_x = dev->sata_dev.identify_packet_device; + + if (identify_x && + (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT)) { + buf += show_chars(identify_x, 27, 20, buf); + buf += sprintf(buf, "\n"); + } + return buf-page; +} + +static ssize_t sata_show_identify_device(struct domain_device *dev, char *page) +{ + char *buf = page; + + if (dev->sata_dev.identify_device && + (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT)) { + __le16 *p = dev->sata_dev.identify_device; + int i; + + for (i = 0; i < 16; i++) { + int k; + for (k = 0; k < 16; k++) + buf += sprintf(buf, "%04x%s", + le16_to_cpu(p[i*16+k]), + k==15 ? "\n" : " "); + } + } + return buf-page; +} + +static ssize_t sata_show_identify_packet(struct domain_device *dev, char *page) +{ + char *buf = page; + + if (dev->sata_dev.identify_packet_device && + (dev->dev_type == SATA_DEV || dev->dev_type == SATA_PM_PORT)) { + __le16 *p = dev->sata_dev.identify_packet_device; + int i; + + for (i = 0; i < 16; i++) { + int k; + for (k = 0; k < 16; k++) + buf += sprintf(buf, "%04x%s", + le16_to_cpu(p[i*16+k]), + k==15 ? "\n" : " "); + } + } + + return buf-page; +} + +static ssize_t sata_show_port_no(struct domain_device *dev, char *page) +{ + int res = 0; + + if (dev->dev_type == SATA_PM || dev->dev_type == SATA_PM_PORT) + res = sprintf(page, "%02Xh\n", dev->sata_dev.port_no); + return res; +} + +/* ---------- SAS end device specific ---------- */ + +static ssize_t sas_show_rled_meaning(struct domain_device *dev, char *page) +{ + return sprintf(page, "%d\n", dev->end_dev.ready_led_meaning); +} + +static ssize_t sas_show_itnl_timeout(struct domain_device *dev, char *page) +{ + return sprintf(page, "0x%04x\n", dev->end_dev.itnl_timeout); +} + +static ssize_t sas_show_iresp_timeout(struct domain_device *dev, char *page) +{ + return sprintf(page, "0x%04x\n", dev->end_dev.iresp_timeout); +} + +static ssize_t sas_show_rl_wlun(struct domain_device *dev, char *page) +{ + return sprintf(page, "%d\n", dev->end_dev.rl_wlun); +} + +/* ---------- LU specific ---------- */ + +static ssize_t lu_show_lun(struct LU *lu, char *page) +{ + return sprintf(page, "%016llx\n", SAS_ADDR(lu->LUN)); +} + +static ssize_t lu_show_inq(struct LU *lu, char *_page) +{ + int i; + char *buf = _page; + if (lu->inquiry_valid_data_len <= 0) + return 0; + for (i = 0; i < lu->inquiry_valid_data_len; i += 4) { + buf += sprintf(buf, "%02x %02x %02x %02x\n", + lu->inquiry_data[i+0], lu->inquiry_data[i+1], + lu->inquiry_data[i+2], lu->inquiry_data[i+3]); + } + + return buf-_page; +} + +static ssize_t lu_show_tm_type(struct LU *lu, char *page) +{ + static const char *tm_type[] = { + "none", + "full", + "basic", + }; + return sprintf(page, "%s\n", tm_type[lu->tm_type]); +} + +static ssize_t lu_show_channel(struct LU *lu, char *page) +{ + if (lu->uldd_dev) + return sprintf(page, "%d\n", lu->map.channel); + return 0; +} + +static ssize_t lu_show_id(struct LU *lu, char *page) +{ + if (lu->uldd_dev) + return sprintf(page, "%d\n", lu->map.id); + return 0; +} + +/* ---------- Sysfs attribute implementation ---------- */ + +struct lu_dev_attribute { + struct attribute attr; + ssize_t (*show)(struct LU *lu, char *); + ssize_t (*store)(struct LU *lu, const char *, size_t); +}; + +static struct lu_dev_attribute lu_attrs[] = { + __ATTR(lun, 0444, lu_show_lun, NULL), + __ATTR(inquiry_data, 0444, lu_show_inq, NULL), + __ATTR(channel, 0444, lu_show_channel, NULL), + __ATTR(id, 0444, lu_show_id, NULL), + __ATTR(task_management, 0444, lu_show_tm_type, NULL), + __ATTR_NULL, +}; + +static struct domain_dev_attribute dev_attrs[] = { + __ATTR(dev_type, 0444, dev_show_type, NULL), + __ATTR(iproto, 0444, dev_show_iproto, NULL), + __ATTR(tproto, 0444, dev_show_tproto, NULL), + __ATTR(sas_addr, 0444, dev_show_sas_addr, NULL), + __ATTR(ready_led_meaning, 0444, sas_show_rled_meaning, NULL), + __ATTR(itnl_timeout, 0444, sas_show_itnl_timeout, NULL), + __ATTR(iresp_timeout, 0444, sas_show_iresp_timeout, NULL), + __ATTR(rl_wlun, 0444, sas_show_rl_wlun, NULL), + __ATTR(linkrate, 0444, dev_show_linkrate, NULL), + __ATTR(min_linkrate, 0444, dev_show_min_linkrate, NULL), + __ATTR(max_linkrate, 0444, dev_show_max_linkrate, NULL), + __ATTR(pathways, 0444, dev_show_pathways, NULL), + __ATTR_NULL, +}; + +static struct domain_dev_attribute sata_attrs[] = { + __ATTR(dev_type, 0444, dev_show_type, NULL), + __ATTR(iproto, 0444, dev_show_iproto, NULL), + __ATTR(tproto, 0444, dev_show_tproto, NULL), + __ATTR(sas_addr, 0444, dev_show_sas_addr, NULL), + __ATTR(linkrate, 0444, dev_show_linkrate, NULL), + __ATTR(min_linkrate, 0444, dev_show_min_linkrate, NULL), + __ATTR(max_linkrate, 0444, dev_show_max_linkrate, NULL), + __ATTR(command_set, 0444, sata_show_command_set, NULL), + __ATTR(report_phy_sata_resp, 0444, sata_show_rps_resp, NULL), + __ATTR(serial_number, 0444, sata_show_serial_number, NULL), + __ATTR(firmware_rev, 0444, sata_show_firmware_rev, NULL), + __ATTR(model_number, 0444, sata_show_model_number, NULL), + __ATTR(identify_device, 0444, sata_show_identify_device, NULL), + __ATTR(identify_packet_device, 0444, sata_show_identify_packet, NULL), + __ATTR(port_no, 0444, sata_show_port_no, NULL), + __ATTR_NULL, +}; + +static void end_dev_release(struct kobject *obj) +{ + struct domain_device *dev = to_dom_device(obj); + BUG_ON(!list_empty(&dev->end_dev.LU_list)); + SAS_DPRINTK("freeing dev %llx\n", SAS_ADDR(dev->sas_addr)); + kfree(dev); +} + +static void sata_dev_release(struct kobject *obj) +{ + struct domain_device *dev = to_dom_device(obj); + + SAS_DPRINTK("freeing SATA dev %llx\n", SAS_ADDR(dev->sas_addr)); + if (dev->sata_dev.identify_device) { + void *p = dev->sata_dev.identify_device; + mb(); + dev->sata_dev.identify_device = NULL; + kfree(p); + } + if (dev->sata_dev.identify_packet_device) { + void *p = dev->sata_dev.identify_packet_device; + mb(); + dev->sata_dev.identify_packet_device = NULL; + kfree(p); + } + kfree(dev); +} + +static void sas_lu_release(struct kobject *obj) +{ + struct LU *lu = to_lu_device(obj); + SAS_DPRINTK("freeing LUN %016llx\n", SAS_ADDR(lu->LUN)); + sas_release_scsi_id(lu->parent->port, lu->map.id); + kfree(lu); +} + +static ssize_t dev_show_attr(struct kobject *kobj, struct attribute *attr, + char *page) +{ + ssize_t ret = 0; + struct domain_device *dev = to_dom_device(kobj); + struct domain_dev_attribute *dev_attr = to_dev_attr(attr); + + if (dev_attr->show) + ret = dev_attr->show(dev, page); + return ret; +} + +static ssize_t lu_show_attr(struct kobject *obj, struct attribute *attr, + char *page) +{ + ssize_t ret = 0; + struct LU *lu = to_lu_device(obj); + struct lu_dev_attribute *lu_attr = to_lu_attr(attr); + + if (lu_attr->show) + ret = lu_attr->show(lu, page); + return ret; +} + +struct sysfs_ops dev_sysfs_ops = { + .show = dev_show_attr, +}; +static struct sysfs_ops lu_sysfs_ops = { + .show = lu_show_attr, +}; + +static struct attribute *end_dev_attrs[ARRAY_SIZE(dev_attrs)]; +static struct attribute *sata_dev_attrs[ARRAY_SIZE(sata_attrs)]; +static struct attribute *lu_dev_attrs[ARRAY_SIZE(lu_attrs)]; + +static struct kobj_type end_dev_ktype = { + .release = end_dev_release, + .sysfs_ops = &dev_sysfs_ops, + .default_attrs = end_dev_attrs, +}; +static struct kobj_type sata_dev_ktype = { + .release = sata_dev_release, + .sysfs_ops = &dev_sysfs_ops, + .default_attrs = sata_dev_attrs, +}; +static struct kobj_type lu_dev_ktype = { + .release = sas_lu_release, + .sysfs_ops = &lu_sysfs_ops, + .default_attrs = lu_dev_attrs, +}; + +struct kobj_type *dev_ktype[] = { + NULL, + &end_dev_ktype, + &ex_dev_ktype, + &ex_dev_ktype, + NULL, + &sata_dev_ktype, + NULL, + NULL, +}; + +/* ---------- Basic task processing for discovery purposes ---------- */ + +static void sas_task_timedout(unsigned long _task) +{ + struct sas_task *task = (void *) _task; + unsigned long flags; + + spin_lock_irqsave(&task->task_state_lock, flags); + if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) + task->task_state_flags |= SAS_TASK_STATE_ABORTED; + spin_unlock_irqrestore(&task->task_state_lock, flags); + + complete(&task->completion); +} + +static void sas_disc_task_done(struct sas_task *task) +{ + if (!del_timer(&task->timer)) + return; + complete(&task->completion); +} + +#define SAS_DEV_TIMEOUT 10 + +/** + * sas_execute_task -- Basic task processing for discovery + * @task: the task to be executed + * @buffer: pointer to buffer to do I/O + * @size: size of @buffer + * @pci_dma_dir: PCI_DMA_... + */ +static int sas_execute_task(struct sas_task *task, void *buffer, int size, + int pci_dma_dir) +{ + int res = 0; + struct scatterlist *scatter = NULL; + struct task_status_struct *ts = &task->task_status; + int num_scatter = 0; + int retries = 0; + + if (pci_dma_dir != PCI_DMA_NONE) { + scatter = kmalloc(sizeof(*scatter), GFP_KERNEL); + if (!scatter) + goto out; + memset(scatter, 0, sizeof(scatter)); + + sg_init_one(scatter, buffer, size); + num_scatter = 1; + } + + task->task_proto = task->dev->tproto; + task->scatter = scatter; + task->num_scatter = num_scatter; + task->total_xfer_len = size; + task->data_dir = pci_dma_dir; + task->task_done = sas_disc_task_done; + + for (retries = 0; retries < 5; retries++) { + task->task_state_flags = SAS_TASK_STATE_PENDING; + init_completion(&task->completion); + + task->timer.data = (unsigned long) task; + task->timer.function = sas_task_timedout; + task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ; + add_timer(&task->timer); + + res = task->dev->port->ha->lldd_execute_task(task, 1, + GFP_KERNEL); + if (res) { + del_timer(&task->timer); + SAS_DPRINTK("executing SAS discovery task failed:%d\n", + res); + goto ex_err; + } + wait_for_completion(&task->completion); + res = -ETASK; + if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { + int res2; + SAS_DPRINTK("task aborted, flags:0x%x\n", + task->task_state_flags); + res2 = task->dev->port->ha->lldd_abort_task(task); + SAS_DPRINTK("came back from abort task\n"); + if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) { + if (res2 == TMF_RESP_FUNC_COMPLETE) + continue; /* Retry the task */ + else + goto ex_err; + } + } + if (task->task_status.stat == SAM_BUSY || + task->task_status.stat == SAM_TASK_SET_FULL || + task->task_status.stat == SAS_QUEUE_FULL) { + SAS_DPRINTK("task: q busy, sleeping...\n"); + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(HZ); + } else if (task->task_status.stat == SAM_CHECK_COND) { + struct scsi_sense_hdr shdr; + + if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size, + &shdr)) { + SAS_DPRINTK("couldn't normalize sense\n"); + continue; + } + if ((shdr.sense_key == 6 && shdr.asc == 0x29) || + (shdr.sense_key == 2 && shdr.asc == 4 && + shdr.ascq == 1)) { + SAS_DPRINTK("device %016llx LUN: %016llx " + "powering up or not ready yet, " + "sleeping...\n", + SAS_ADDR(task->dev->sas_addr), + SAS_ADDR(task->ssp_task.LUN)); + + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(5*HZ); + } else if (shdr.sense_key == 1) { + res = 0; + break; + } else if (shdr.sense_key == 5) { + break; + } else { + SAS_DPRINTK("dev %016llx LUN: %016llx " + "sense key:0x%x ASC:0x%x ASCQ:0x%x" + "\n", + SAS_ADDR(task->dev->sas_addr), + SAS_ADDR(task->ssp_task.LUN), + shdr.sense_key, + shdr.asc, shdr.ascq); + } + } else if (task->task_status.resp != SAS_TASK_COMPLETE || + task->task_status.stat != SAM_GOOD) { + SAS_DPRINTK("task finished with resp:0x%x, " + "stat:0x%x\n", + task->task_status.resp, + task->task_status.stat); + goto ex_err; + } else { + res = 0; + break; + } + } +ex_err: + if (pci_dma_dir != PCI_DMA_NONE) + kfree(scatter); +out: + return res; +} + +/* ---------- Domain device discovery ---------- */ + +/** + * sas_get_port_device -- Discover devices which caused port creation + * @port: pointer to struct sas_port of interest + * + * Devices directly attached to a HA port, have no parent. This is + * how we know they are (domain) "root" devices. All other devices + * do, and should have their "parent" pointer set appropriately as + * soon as a child device is discovered. + */ +static int sas_get_port_device(struct sas_port *port) +{ + unsigned long flags; + struct sas_phy *phy; + struct domain_device *dev; + + dev = kmalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + memset(dev, 0, sizeof(*dev)); + + spin_lock_irqsave(&port->phy_list_lock, flags); + if (list_empty(&port->phy_list)) { + spin_unlock_irqrestore(&port->phy_list_lock, flags); + kfree(dev); + return -ENODEV; + } + phy = container_of(port->phy_list.next, struct sas_phy, port_phy_el); + spin_lock(&phy->frame_rcvd_lock); + memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd), + (size_t)phy->frame_rcvd_size)); + spin_unlock(&phy->frame_rcvd_lock); + spin_unlock_irqrestore(&port->phy_list_lock, flags); + + if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) { + struct dev_to_host_fis *fis = + (struct dev_to_host_fis *) dev->frame_rcvd; + if (fis->interrupt_reason == 1 && fis->lbal == 1 && + fis->byte_count_low==0x69 && fis->byte_count_high == 0x96 + && (fis->device & ~0x10) == 0) + dev->dev_type = SATA_PM; + else + dev->dev_type = SATA_DEV; + dev->tproto = SATA_PROTO; + } else { + struct sas_identify_frame *id = + (struct sas_identify_frame *) dev->frame_rcvd; + dev->dev_type = id->dev_type; + dev->iproto = id->initiator_bits; + dev->tproto = id->target_bits; + } + + sas_init_dev(dev); + + memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE); + sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); + port->port_dev = dev; + dev->port = port; + dev->linkrate = port->linkrate; + dev->min_linkrate = port->linkrate; + dev->max_linkrate = port->linkrate; + dev->pathways = port->num_phys; + memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE); + memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE); + memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE); + port->disc.max_level = 0; + + return 0; +} + +/* ---------- Discover and Revalidate ---------- */ + +/* ---------- SATA ---------- */ + +static inline void sas_get_ata_command_set(struct domain_device *dev) +{ + struct dev_to_host_fis *fis = + (struct dev_to_host_fis *) dev->frame_rcvd; + + if ((fis->sector_count == 1 && /* ATA */ + fis->lbal == 1 && + fis->lbam == 0 && + fis->lbah == 0 && + fis->device == 0)) + + dev->sata_dev.command_set = ATA_COMMAND_SET; + + else if ((fis->interrupt_reason == 1 && /* ATAPI */ + fis->lbal == 1 && + fis->byte_count_low == 0x14 && + fis->byte_count_high == 0xEB && + (fis->device & ~0x10) == 0)) + + dev->sata_dev.command_set = ATAPI_COMMAND_SET; + + else if ((fis->sector_count == 1 && /* SEMB */ + fis->lbal == 1 && + fis->lbam == 0x3C && + fis->lbah == 0xC3 && + fis->device == 0) + || + (fis->interrupt_reason == 1 && /* SATA PM */ + fis->lbal == 1 && + fis->byte_count_low == 0x69 && + fis->byte_count_high == 0x96 && + (fis->device & ~0x10) == 0)) + + dev->sata_dev.command_set = ATAPI_COMMAND_SET; +} + +/** + * sas_issue_ata_cmd -- Basic SATA command processing for discovery + * @dev: the device to send the command to + * @command: the command register + * @features: the features register + * @buffer: pointer to buffer to do I/O + * @size: size of @buffer + * @pci_dma_dir: PCI_DMA_... + */ +static int sas_issue_ata_cmd(struct domain_device *dev, u8 command, + u8 features, void *buffer, int size, + int pci_dma_dir) +{ + int res = 0; + struct sas_task *task; + struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *) + &dev->frame_rcvd[0]; + + res = -ENOMEM; + task = sas_alloc_task(GFP_KERNEL); + if (!task) + goto out; + + task->dev = dev; + + task->ata_task.fis.command = command; + task->ata_task.fis.features = features; + task->ata_task.fis.device = d2h_fis->device; + task->ata_task.retry_count = 1; + + res = sas_execute_task(task, buffer, size, pci_dma_dir); + + sas_free_task(task); +out: + return res; +} + +static void sas_sata_propagate_sas_addr(struct domain_device *dev) +{ + unsigned long flags; + struct sas_port *port = dev->port; + struct sas_phy *phy; + + BUG_ON(dev->parent); + + memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE); + spin_lock_irqsave(&port->phy_list_lock, flags); + list_for_each_entry(phy, &port->phy_list, port_phy_el) + memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE); + spin_unlock_irqrestore(&port->phy_list_lock, flags); +} + +#define ATA_IDENTIFY_DEV 0xEC +#define ATA_IDENTIFY_PACKET_DEV 0xA1 +#define ATA_SET_FEATURES 0xEF +#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07 + +/** + * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV) + * @dev: STP/SATA device of interest (ATA/ATAPI) + * + * The LLDD has already been notified of this device, so that we can + * send FISes to it. Here we try to get IDENTIFY DEVICE or IDENTIFY + * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its + * performance for this device. + */ +static int sas_discover_sata_dev(struct domain_device *dev) +{ + int res; + __le16 *identify_x; + u8 command; + + identify_x = kmalloc(512, GFP_KERNEL); + if (!identify_x) + return -ENOMEM; + memset(identify_x, 0, 512); + + if (dev->sata_dev.command_set == ATA_COMMAND_SET) { + dev->sata_dev.identify_device = identify_x; + command = ATA_IDENTIFY_DEV; + } else { + dev->sata_dev.identify_packet_device = identify_x; + command = ATA_IDENTIFY_PACKET_DEV; + } + + res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, + PCI_DMA_FROMDEVICE); + if (res) + goto out_err; + + /* lives on the media? */ + if (le16_to_cpu(identify_x[0]) & 4) { + /* incomplete response */ + SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to " + "dev %llx\n", SAS_ADDR(dev->sas_addr)); + if (!le16_to_cpu(identify_x[83] & (1<<6))) + goto cont1; + res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES, + ATA_FEATURE_PUP_STBY_SPIN_UP, + NULL, 0, PCI_DMA_NONE); + if (res) + goto cont1; + + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(5*HZ); /* More time? */ + res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512, + PCI_DMA_FROMDEVICE); + if (res) + goto out_err; + } +cont1: + /* Get WWN */ + if (dev->port->oob_mode != SATA_OOB_MODE) { + memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr, + SAS_ADDR_SIZE); + } else if (dev->sata_dev.command_set == ATA_COMMAND_SET && + (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000) + == 0x5000) { + int i; + + for (i = 0; i < 4; i++) { + dev->sas_addr[2*i] = + (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8; + dev->sas_addr[2*i+1] = + le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF; + } + } + sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); + if (!dev->parent) + sas_sata_propagate_sas_addr(dev); + + return 0; +out_err: + dev->sata_dev.identify_packet_device = NULL; + dev->sata_dev.identify_device = NULL; + kfree(identify_x); + return res; +} + +static int sas_discover_sata_pm(struct domain_device *dev) +{ + return -ENODEV; +} + +/* ---------- SAS end devices ---------- */ + +static int sas_get_itnl_timeout(struct domain_device *dev) +{ + static const u8 mode_sense_6[16] = { 0x1a, }; + static const u8 mode_sense_10[16] = { 0x5a, }; + + int res = -ENOMEM; + struct sas_task *task; + u8 *buffer, *__buf; + const int buffer_size = 12; + + task = sas_alloc_task(GFP_KERNEL); + if (!task) + return -ENOMEM; + buffer = kmalloc(buffer_size, GFP_KERNEL); + if (!buffer) + goto out; + __buf = buffer; + + task->dev = dev; + + task->ssp_task.retry_count = 1; + memcpy(task->ssp_task.cdb, mode_sense_6, 16); + task->ssp_task.cdb[1] |= (1 << 3); + task->ssp_task.cdb[2] = 0x19; + task->ssp_task.cdb[4] = buffer_size; + + res = sas_execute_task(task, buffer, buffer_size, PCI_DMA_FROMDEVICE); + if (res) { + SAS_DPRINTK("task to device %llx returned stat 0x%x for " + "MODE SENSE 6\n", + SAS_ADDR(dev->sas_addr), task->task_status.stat); + memcpy(task->ssp_task.cdb, mode_sense_10, 16); + task->ssp_task.cdb[1] |= (1 << 3); + task->ssp_task.cdb[2] = 0x19; + task->ssp_task.cdb[8] = buffer_size; + + res = sas_execute_task(task, buffer, buffer_size, + PCI_DMA_FROMDEVICE); + if (res) { + SAS_DPRINTK("task to device %llx returned stat 0x%x " + "for MODE SENSE 10\n", + SAS_ADDR(dev->sas_addr), + task->task_status.stat); + goto out_buf; + } + dev->end_dev.ms_10 = 1; + buffer += 4; + } + + buffer += 4; /* skip mode parameter header */ + + dev->end_dev.ready_led_meaning = (buffer[2] & (1<<4)) ? 1 : 0; + dev->end_dev.itnl_timeout = be16_to_cpu(*(__be16 *)(buffer+4)); + dev->end_dev.iresp_timeout= be16_to_cpu(*(__be16 *)(buffer+6)); + + res = 0; + +out_buf: + kfree(__buf); +out: + sas_free_task(task); + return res; +} + +static int sas_get_report_luns(struct domain_device *dev, u8 **buffer, + int *size) +{ + static const u8 report_luns[16] = { 0xA0, }; + static const u8 RL_WLUN[8] = { 0xC1, 0x01, }; + + int res = -ENOMEM; + struct sas_task *task; + u8 *buf; + int buffer_size = 16; + u32 len; + + *buffer = kmalloc(buffer_size, GFP_KERNEL); + if (!*buffer) + return -ENOMEM; + buf = *buffer; + + task = sas_alloc_task(GFP_KERNEL); + if (!task) + goto out_err; + + task->dev = dev; + task->ssp_task.retry_count = 1; + memcpy(task->ssp_task.cdb, report_luns, 16); + *(__be32 *)(&task->ssp_task.cdb[6]) = cpu_to_be32(buffer_size); + + res = sas_execute_task(task, buf, buffer_size, PCI_DMA_FROMDEVICE); + if (res) { + SAS_DPRINTK("REPORT LUNS to LUN0 failed for device %llx " + "with status:0x%x\n", + SAS_ADDR(dev->sas_addr), task->task_status.stat); + memcpy(task->ssp_task.LUN, RL_WLUN, 8); + res = sas_execute_task(task, buf, buffer_size, + PCI_DMA_FROMDEVICE); + if (res) { + SAS_DPRINTK("REPORT LUNS to REPORT LUNS W-LUN failed " + "for device %llx with status:0x%x\n", + SAS_ADDR(dev->sas_addr), + task->task_status.stat); + goto out_err_task; + } + dev->end_dev.rl_wlun = 1; + } + + len = be32_to_cpu(*(__be32 *)buf); + if (len + 8 > buffer_size) { + SAS_DPRINTK("need bigger buffer for REPORT LUNS\n"); + buffer_size = len + 8; + res = -ENOMEM; + buf = kmalloc(buffer_size, GFP_KERNEL); + if (!buf) + goto out_err_task; + kfree(*buffer); + *buffer = buf; + if (dev->end_dev.rl_wlun) + memcpy(task->ssp_task.LUN, RL_WLUN, 8); + else + memset(task->ssp_task.LUN, 0, 8); + res = sas_execute_task(task, buf, buffer_size, + PCI_DMA_FROMDEVICE); + if (res) { + SAS_DPRINTK("2nd REPORT LUNS to %s failed " + "for device %llx with status:0x%x\n", + dev->end_dev.rl_wlun ? "REPORT LUNS W-LUN" + : "LUN0", + SAS_ADDR(dev->sas_addr), + task->task_status.stat); + goto out_err_task; + } + } + + *size = len+8; + sas_free_task(task); + return 0; + +out_err_task: + sas_free_task(task); +out_err: + kfree(*buffer); + *buffer = NULL; + size = 0; + return res; +} + +static int sas_get_inquiry(struct LU *lu) +{ + static const u8 inquiry_cmd[16] = { 0x12, }; + struct sas_task *task; + int res; + + task = sas_alloc_task(GFP_KERNEL); + if (!task) + return -ENOMEM; + + task->dev = lu->parent; + task->ssp_task.retry_count = 1; + memcpy(task->ssp_task.LUN, lu->LUN, 8); + memcpy(task->ssp_task.cdb, inquiry_cmd, 16); + *(__be16 *)(task->ssp_task.cdb+3) = cpu_to_be16(SAS_INQUIRY_DATA_LEN); + + res = sas_execute_task(task, lu->inquiry_data, SAS_INQUIRY_DATA_LEN, + PCI_DMA_FROMDEVICE); + if (!res) + lu->inquiry_valid_data_len = min(SAS_INQUIRY_DATA_LEN, + lu->inquiry_data[4]+5); + sas_free_task(task); + return res; +} + +static struct LU *sas_alloc_lu(void) +{ + struct LU *lu = kmalloc(sizeof(*lu), GFP_KERNEL); + if (lu) { + memset(lu, 0, sizeof(*lu)); + INIT_LIST_HEAD(&lu->list); + } + return lu; +} + +static int sas_register_lu(struct domain_device *dev, u8 *buf, int size) +{ + int res; + + for (buf = buf+8, size -= 8; size > 0; size -= 8, buf += 8) { + struct LU *lu = sas_alloc_lu(); + + SAS_DPRINTK("%016llx probing LUN:%016llx\n", + SAS_ADDR(dev->sas_addr), + be64_to_cpu(*(__be64 *)buf)); + if (lu) { + lu->parent = dev; + memcpy(lu->LUN, buf, 8); + res = sas_get_inquiry(lu); + if (res) { + SAS_DPRINTK("dev %llx LUN %016llx didn't reply" + " to INQUIRY, forgotten\n", + SAS_ADDR(dev->sas_addr), + SAS_ADDR(lu->LUN)); + kfree(lu); + continue; + } + lu->lu_obj.kset = &dev->end_dev.LU_kset; + kobject_set_name(&lu->lu_obj, "%016llx", + SAS_ADDR(lu->LUN)); + lu->lu_obj.ktype = dev->end_dev.LU_kset.ktype; + memcpy(lu->LUN, buf, 8); + list_add_tail(&lu->list, &dev->end_dev.LU_list); + } + } + + return list_empty(&dev->end_dev.LU_list) ? -ENODEV : 0; +} + +/** + * sas_do_lu_discovery -- Discover LUs of a SCSI device + * @dev: pointer to a domain device of interest + * + * Discover logical units present in the SCSI device. I'd like this + * to be moved to SCSI Core, but SCSI Core has no concept of a "SCSI + * device with a SCSI Target port". A SCSI device with a SCSI Target + * port is a device which the _transport_ found, but other than that, + * the transport has little or _no_ knowledge about the device. + * Ideally, a LLDD would register a "SCSI device with a SCSI Target + * port" with SCSI Core and then SCSI Core would do LU discovery of + * that device. + * + * REPORT LUNS is mandatory. If a device doesn't support it, + * it is broken and you should return it. Nevertheless, we + * assume (optimistically) that the link hasn't been severed and + * that maybe we can get to the device anyhow. + */ +static int sas_do_lu_discovery(struct domain_device *dev) +{ + int res; + u8 *buffer; + int size; + + res = sas_get_report_luns(dev, &buffer, &size); + if (res) { + SAS_DPRINTK("dev %llx didn't reply to REPORT LUNS, trying " + "LUN 0 anyway\n", + SAS_ADDR(dev->sas_addr)); + size = 16; + buffer = kmalloc(size, GFP_KERNEL); + memset(buffer, 0, size); + } + + res = sas_register_lu(dev, buffer, size); + if (res) { + SAS_DPRINTK("dev %llx didn't report any LUs\n", + SAS_ADDR(dev->sas_addr)); + res = 0; + } + + kfree(buffer); + return res; +} + +/* ---------- Common/dispatchers ---------- */ + +void sas_kobj_set(struct domain_device *dev) +{ + if (!dev->parent) { + /* device directly attached to the host adapter */ + dev->dev_obj.kset = &dev->port->dev_kset; + } else { + /* parent is an expander */ + dev->dev_obj.parent = &dev->parent->dev_obj; + dev->port = dev->parent->port; + } + + list_add_tail(&dev->dev_list_node, &dev->port->dev_list); + kobject_set_name(&dev->dev_obj, "%016llx", SAS_ADDR(dev->sas_addr)); + dev->dev_obj.ktype = dev_ktype[dev->dev_type]; +} + +/** + * sas_discover_sata -- discover an STP/SATA domain device + * @dev: pointer to struct domain_device of interest + * + * First we notify the LLDD of this device, so we can send frames to + * it. Then depending on the type of device we call the appropriate + * discover functions. Once device discover is done, we notify the + * LLDD so that it can fine-tune its parameters for the device, by + * removing it and then adding it. That is, the second time around, + * the driver would have certain fields, that it is looking at, set. + * Finally we initialize the kobj so that the device can be added to + * the system at registration time. Devices directly attached to a HA + * port, have no parents. All other devices do, and should have their + * "parent" pointer set appropriately before calling this function. + */ +int sas_discover_sata(struct domain_device *dev) +{ + int res; + + sas_get_ata_command_set(dev); + + res = sas_notify_lldd_dev_found(dev); + if (res) + return res; + + switch (dev->dev_type) { + case SATA_DEV: + res = sas_discover_sata_dev(dev); + break; + case SATA_PM: + res = sas_discover_sata_pm(dev); + break; + default: + break; + } + + sas_notify_lldd_dev_gone(dev); + if (!res) { + sas_notify_lldd_dev_found(dev); + sas_kobj_set(dev); + } + return res; +} + +/** + * sas_discover_end_dev -- discover an end device (SSP, etc) + * @end: pointer to domain device of interest + * + * See comment in sas_discover_sata(). + * + * Get the ITNL timeout only for domain root devices. + * If we couldn't get it, either the link was severed or + * this is a device which doesn't support MODE SENSE. + */ +int sas_discover_end_dev(struct domain_device *dev) +{ + int res; + + res = sas_notify_lldd_dev_found(dev); + if (res) + return res; + + res = sas_get_itnl_timeout(dev); + if (!res) { + sas_notify_lldd_dev_gone(dev); + sas_notify_lldd_dev_found(dev); + } + + dev->end_dev.LU_kset.kobj.parent = &dev->dev_obj; + dev->end_dev.LU_kset.ktype = &lu_dev_ktype; + + res = sas_do_lu_discovery(dev); + if (res) + goto out_err; + + kobject_set_name(&dev->end_dev.LU_kset.kobj, "%s", "LUNS"); + + sas_kobj_set(dev); + return 0; + +out_err: + sas_notify_lldd_dev_gone(dev); + return res; +} + +/* ---------- Device registration and unregistration ---------- */ + +static inline void sas_unregister_common_dev(struct domain_device *dev) +{ + sas_notify_lldd_dev_gone(dev); + if (!dev->parent) + dev->port->port_dev = NULL; + else + list_del_init(&dev->siblings); + list_del_init(&dev->dev_list_node); + kobject_unregister(&dev->dev_obj); +} + +static int sas_register_end_dev(struct domain_device *dev) +{ + struct LU *lu; + + kobject_register(&dev->dev_obj); + kset_register(&dev->end_dev.LU_kset); + + list_for_each_entry(lu, &dev->end_dev.LU_list, list) { + kobject_register(&lu->lu_obj); + sas_register_with_scsi(lu); + } + + return 0; +} + +static void sas_unregister_end_dev(struct domain_device *dev) +{ + struct LU *lu, *n; + + list_for_each_entry_safe(lu, n, &dev->end_dev.LU_list, list) { + sas_unregister_with_scsi(lu); + list_del_init(&lu->list); + kobject_unregister(&lu->lu_obj); + } + kset_unregister(&dev->end_dev.LU_kset); + sas_unregister_common_dev(dev); +} + +static int sas_register_sata(struct domain_device *dev) +{ + kobject_register(&dev->dev_obj); + return 0; +} + +static void sas_unregister_sata(struct domain_device *dev) +{ + sas_unregister_common_dev(dev); +} + +/** + * sas_register_ex_dev -- Register this expander + * @ex: pointer to domain device + * + * It is imperative that this is done breadth-first. Other parts of + * the code rely on that. + */ +static int sas_register_ex_dev(struct domain_device *dev) +{ + kobject_register(&dev->dev_obj); + sysfs_create_bin_file(&dev->dev_obj, &dev->ex_dev.smp_bin_attr); + return 0; +} + +static void sas_unregister_ex_dev(struct domain_device *dev) +{ + BUG_ON(!list_empty(&dev->ex_dev.children)); + sysfs_remove_bin_file(&dev->dev_obj, &dev->ex_dev.smp_bin_attr); + sas_unregister_common_dev(dev); +} + +/** + * sas_register_domain_devs -- register the domain devices with sysfs + * @port: the port to the domain + * + * This function registers the domain devices with sysfs and with + * the SCSI subsystem. + */ +static int sas_register_domain_devs(struct sas_port *port) +{ + struct domain_device *dev; + + list_for_each_entry(dev, &port->dev_list, dev_list_node) { + if (dev->dev_obj.dentry) + continue; + switch (dev->dev_type) { + case SAS_END_DEV: + sas_register_end_dev(dev); + break; + case EDGE_DEV: + case FANOUT_DEV: + sas_register_ex_dev(dev); + break; + case SATA_DEV: + case SATA_PM: + sas_register_sata(dev); + break; + default: + SAS_DPRINTK("%s: unknown device type %d\n", + __FUNCTION__, dev->dev_type); + break; + } + } + + return 0; +} + +void sas_unregister_dev(struct domain_device *dev) +{ + switch (dev->dev_type) { + case SAS_END_DEV: + sas_unregister_end_dev(dev); + break; + case EDGE_DEV: + case FANOUT_DEV: + sas_unregister_ex_dev(dev); + break; + case SATA_DEV: + case SATA_PM: + sas_unregister_sata(dev); + break; + default: + SAS_DPRINTK("%s: unknown device type %d\n", + __FUNCTION__, dev->dev_type); + BUG_ON(dev); + break; + } +} + +static void sas_unregister_domain_devices(struct sas_port *port) +{ + struct domain_device *dev, *n; + + list_for_each_entry_reverse_safe(dev,n,&port->dev_list,dev_list_node) + sas_unregister_dev(dev); +} + +/* ---------- Discovery and Revalidation ---------- */ + +/** + * sas_discover_domain -- discover the domain + * @port: port to the domain of interest + * + * NOTE: this process _must_ quit (return) as soon as any connection + * errors are encountered. Connection recovery is done elsewhere. + * Discover process only interrogates devices in order to discover the + * domain. + */ +static int sas_discover_domain(struct sas_port *port) +{ + int error = 0; + + + if (port->port_dev) + return 0; + else { + error = sas_get_port_device(port); + if (error) + return error; + } + + SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id, + current->pid); + + switch (port->port_dev->dev_type) { + case SAS_END_DEV: + error = sas_discover_end_dev(port->port_dev); + break; + case EDGE_DEV: + case FANOUT_DEV: + error = sas_discover_root_expander(port->port_dev); + break; + case SATA_DEV: + case SATA_PM: + error = sas_discover_sata(port->port_dev); + break; + default: + SAS_DPRINTK("unhandled device %d\n", port->port_dev->dev_type); + break; + } + + if (error) { + kfree(port->port_dev); /* not kobject_register-ed yet */ + port->port_dev = NULL; + } else + sas_register_domain_devs(port); + + SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id, + current->pid, error); + + return error; +} + +static int sas_revalidate_domain(struct sas_port *port) +{ + int res = 0; + + SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id, + current->pid); + if (port->port_dev) { + res = sas_ex_revalidate_domain(port->port_dev); + if (!res) + sas_register_domain_devs(port); + } + SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n", + port->id, current->pid, res); + return res; +} + +/* ---------- Threads and events ---------- */ + +static DECLARE_COMPLETION(disc_comp_start); + +static int sas_discover_thread(void *_sas_port) +{ + struct sas_port *port = _sas_port; + struct sas_ha_struct *sas_ha = port->ha; + struct sas_discovery *disc = &port->disc; + + daemonize("sas_disc_h%dp%d", sas_ha->core.shost->host_no, port->id); + + spin_lock(&disc->disc_event_lock); + disc->disc_thread = current; + complete(&disc_comp_start); + while (!disc->disc_thread_quit && !list_empty(&disc->disc_event_list)){ + struct list_head *head = disc->disc_event_list.next; + enum discover_event disc_ev = container_of(head, + struct sas_event, + el)->event; + list_del_init(head); + spin_unlock(&disc->disc_event_lock); + + switch (disc_ev) { + case DISCE_DISCOVER_DOMAIN: + sas_discover_domain(port); + break; + case DISCE_REVALIDATE_DOMAIN: + sas_revalidate_domain(port); + break; + case DISCE_PORT_GONE: + sas_unregister_domain_devices(port); + complete(&port->port_gone_completion); + break; + } + spin_lock(&disc->disc_event_lock); + } + INIT_LIST_HEAD(&disc->disc_event_list); + disc->disc_thread = NULL; + spin_unlock(&disc->disc_event_lock); + up(&disc->disc_sema); + + return 0; +} + +static int sas_create_discover_thread(struct sas_port *port) +{ + int i; + + init_completion(&disc_comp_start); + i = kernel_thread(sas_discover_thread, port, 0); + if (i >= 0) + wait_for_completion(&disc_comp_start); + + return i < 0 ? i : 0; +} + +int sas_discover_event(struct sas_port *port, enum discover_event ev) +{ + int res; + struct sas_discovery *disc = &port->disc; + + spin_lock(&disc->disc_event_lock); + list_move_tail(&disc->disc_events[ev].el, + &disc->disc_event_list); + if (disc->disc_thread) { + spin_unlock(&disc->disc_event_lock); + return 0; + } + down_interruptible(&disc->disc_sema); + disc->disc_thread_quit = 0; + spin_unlock(&disc->disc_event_lock); + + /* The event thread (caller) is single threaded so this is safe. */ + res = sas_create_discover_thread(port); + if (res) { + SAS_DPRINTK("sas port%d: couldn't create discovery thread!\n", + port->id); + up(&disc->disc_sema); + } + return res; +} + +void sas_kill_disc_thread(struct sas_port *port) +{ + struct sas_discovery *disc = &port->disc; + + spin_lock(&disc->disc_event_lock); + disc->disc_thread_quit = 1; + if (disc->disc_thread) { + wake_up_process(disc->disc_thread); + spin_unlock(&disc->disc_event_lock); + down_interruptible(&disc->disc_sema); + return; + } + spin_unlock(&disc->disc_event_lock); +} + +/** + * sas_init_disc -- initialize the discovery struct in the port + * @port: pointer to struct port + * + * Called when the ports are being initialized. + */ +void sas_init_disc(struct sas_discovery *disc, struct sas_port *port) +{ + int i; + + if (!end_dev_attrs[0]) { + for (i = 0; i < ARRAY_SIZE(dev_attrs)-1; i++) + end_dev_attrs[i] = &dev_attrs[i].attr; + end_dev_attrs[i] = NULL; + sas_init_ex_attr(); + for (i = 0; i < ARRAY_SIZE(sata_attrs)-1; i++) + sata_dev_attrs[i] = &sata_attrs[i].attr; + sata_dev_attrs[i] = NULL; + for (i = 0; i < ARRAY_SIZE(lu_attrs)-1; i++) + lu_dev_attrs[i] = &lu_attrs[i].attr; + lu_dev_attrs[i] = NULL; + } + + spin_lock_init(&disc->disc_event_lock); + INIT_LIST_HEAD(&disc->disc_event_list); + init_MUTEX(&disc->disc_sema); + disc->disc_thread = NULL; + disc->disc_thread_quit = 0; + + for (i = 0; i < DISC_NUM_EVENTS; i++) { + struct sas_event *ev = &disc->disc_events[i]; + ev->event = i; + INIT_LIST_HEAD(&ev->el); + } +} + +void sas_unregister_devices(struct sas_ha_struct *sas_ha) +{ + int i; + + for (i = 0; i < sas_ha->num_phys; i++) + sas_unregister_domain_devices(sas_ha->sas_port[i]); +} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/