--- /dev/null
+/*
+ * Serial Attached SCSI (SAS) Expander discovery and configuration
+ *
+ * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ *
+ * 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
+ *
+ */
+
+#include <linux/scatterlist.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+
+#include "sas_internal.h"
+
+#include <scsi/sas_ata.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+#include "../scsi_sas_internal.h"
+
+static int sas_discover_expander(struct domain_device *dev);
+static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
+static int sas_configure_phy(struct domain_device *dev, int phy_id,
+ u8 *sas_addr, int include);
+static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr);
+
+/* ---------- SMP task management ---------- */
+
+static void smp_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->slow_task->completion);
+}
+
+static void smp_task_done(struct sas_task *task)
+{
+ if (!del_timer(&task->slow_task->timer))
+ return;
+ complete(&task->slow_task->completion);
+}
+
+/* Give it some long enough timeout. In seconds. */
+#define SMP_TIMEOUT 10
+
+static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
+ void *resp, int resp_size)
+{
+ int res, retry;
+ struct sas_task *task = NULL;
+ struct sas_internal *i =
+ to_sas_internal(dev->port->ha->core.shost->transportt);
+
+ mutex_lock(&dev->ex_dev.cmd_mutex);
+ for (retry = 0; retry < 3; retry++) {
+ if (test_bit(SAS_DEV_GONE, &dev->state)) {
+ res = -ECOMM;
+ break;
+ }
+
+ task = sas_alloc_slow_task(GFP_KERNEL);
+ if (!task) {
+ res = -ENOMEM;
+ break;
+ }
+ task->dev = dev;
+ task->task_proto = dev->tproto;
+ sg_init_one(&task->smp_task.smp_req, req, req_size);
+ sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
+
+ task->task_done = smp_task_done;
+
+ task->slow_task->timer.data = (unsigned long) task;
+ task->slow_task->timer.function = smp_task_timedout;
+ task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
+ add_timer(&task->slow_task->timer);
+
+ res = i->dft->lldd_execute_task(task, GFP_KERNEL);
+
+ if (res) {
+ del_timer(&task->slow_task->timer);
+ SAS_DPRINTK("executing SMP task failed:%d\n", res);
+ break;
+ }
+
+ wait_for_completion(&task->slow_task->completion);
+ res = -ECOMM;
+ if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
+ SAS_DPRINTK("smp task timed out or aborted\n");
+ i->dft->lldd_abort_task(task);
+ if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
+ SAS_DPRINTK("SMP task aborted and not done\n");
+ break;
+ }
+ }
+ if (task->task_status.resp == SAS_TASK_COMPLETE &&
+ task->task_status.stat == SAM_STAT_GOOD) {
+ res = 0;
+ break;
+ }
+ if (task->task_status.resp == SAS_TASK_COMPLETE &&
+ task->task_status.stat == SAS_DATA_UNDERRUN) {
+ /* no error, but return the number of bytes of
+ * underrun */
+ res = task->task_status.residual;
+ break;
+ }
+ if (task->task_status.resp == SAS_TASK_COMPLETE &&
+ task->task_status.stat == SAS_DATA_OVERRUN) {
+ res = -EMSGSIZE;
+ break;
+ }
+ if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
+ task->task_status.stat == SAS_DEVICE_UNKNOWN)
+ break;
+ else {
+ SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
+ "status 0x%x\n", __func__,
+ SAS_ADDR(dev->sas_addr),
+ task->task_status.resp,
+ task->task_status.stat);
+ sas_free_task(task);
+ task = NULL;
+ }
+ }
+ mutex_unlock(&dev->ex_dev.cmd_mutex);
+
+ BUG_ON(retry == 3 && task != NULL);
+ sas_free_task(task);
+ return res;
+}
+
+/* ---------- Allocations ---------- */
+
+static inline void *alloc_smp_req(int size)
+{
+ u8 *p = kzalloc(size, GFP_KERNEL);
+ if (p)
+ p[0] = SMP_REQUEST;
+ return p;
+}
+
+static inline void *alloc_smp_resp(int size)
+{
+ return kzalloc(size, GFP_KERNEL);
+}
+
+static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)
+{
+ switch (phy->routing_attr) {
+ case TABLE_ROUTING:
+ if (dev->ex_dev.t2t_supp)
+ return 'U';
+ else
+ return 'T';
+ case DIRECT_ROUTING:
+ return 'D';
+ case SUBTRACTIVE_ROUTING:
+ return 'S';
+ default:
+ return '?';
+ }
+}
+
+static enum sas_device_type to_dev_type(struct discover_resp *dr)
+{
+ /* This is detecting a failure to transmit initial dev to host
+ * FIS as described in section J.5 of sas-2 r16
+ */
+ if (dr->attached_dev_type == SAS_PHY_UNUSED && dr->attached_sata_dev &&
+ dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)
+ return SAS_SATA_PENDING;
+ else
+ return dr->attached_dev_type;
+}
+
+static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
+{
+ enum sas_device_type dev_type;
+ enum sas_linkrate linkrate;
+ u8 sas_addr[SAS_ADDR_SIZE];
+ struct smp_resp *resp = rsp;
+ struct discover_resp *dr = &resp->disc;
+ struct sas_ha_struct *ha = dev->port->ha;
+ struct expander_device *ex = &dev->ex_dev;
+ struct ex_phy *phy = &ex->ex_phy[phy_id];
+ struct sas_rphy *rphy = dev->rphy;
+ bool new_phy = !phy->phy;
+ char *type;
+
+ if (new_phy) {
+ if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
+ return;
+ phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
+
+ /* FIXME: error_handling */
+ BUG_ON(!phy->phy);
+ }
+
+ switch (resp->result) {
+ case SMP_RESP_PHY_VACANT:
+ phy->phy_state = PHY_VACANT;
+ break;
+ default:
+ phy->phy_state = PHY_NOT_PRESENT;
+ break;
+ case SMP_RESP_FUNC_ACC:
+ phy->phy_state = PHY_EMPTY; /* do not know yet */
+ break;
+ }
+
+ /* check if anything important changed to squelch debug */
+ dev_type = phy->attached_dev_type;
+ linkrate = phy->linkrate;
+ memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
+
+ /* Handle vacant phy - rest of dr data is not valid so skip it */
+ if (phy->phy_state == PHY_VACANT) {
+ memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
+ phy->attached_dev_type = SAS_PHY_UNUSED;
+ if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
+ phy->phy_id = phy_id;
+ goto skip;
+ } else
+ goto out;
+ }
+
+ phy->attached_dev_type = to_dev_type(dr);
+ if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
+ goto out;
+ phy->phy_id = phy_id;
+ phy->linkrate = dr->linkrate;
+ phy->attached_sata_host = dr->attached_sata_host;
+ phy->attached_sata_dev = dr->attached_sata_dev;
+ phy->attached_sata_ps = dr->attached_sata_ps;
+ phy->attached_iproto = dr->iproto << 1;
+ phy->attached_tproto = dr->tproto << 1;
+ /* help some expanders that fail to zero sas_address in the 'no
+ * device' case
+ */
+ if (phy->attached_dev_type == SAS_PHY_UNUSED ||
+ phy->linkrate < SAS_LINK_RATE_1_5_GBPS)
+ memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
+ else
+ memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
+ phy->attached_phy_id = dr->attached_phy_id;
+ phy->phy_change_count = dr->change_count;
+ phy->routing_attr = dr->routing_attr;
+ phy->virtual = dr->virtual;
+ phy->last_da_index = -1;
+
+ phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
+ phy->phy->identify.device_type = dr->attached_dev_type;
+ phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
+ phy->phy->identify.target_port_protocols = phy->attached_tproto;
+ if (!phy->attached_tproto && dr->attached_sata_dev)
+ phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;
+ phy->phy->identify.phy_identifier = phy_id;
+ phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
+ phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
+ phy->phy->minimum_linkrate = dr->pmin_linkrate;
+ phy->phy->maximum_linkrate = dr->pmax_linkrate;
+ phy->phy->negotiated_linkrate = phy->linkrate;
+
+ skip:
+ if (new_phy)
+ if (sas_phy_add(phy->phy)) {
+ sas_phy_free(phy->phy);
+ return;
+ }
+
+ out:
+ switch (phy->attached_dev_type) {
+ case SAS_SATA_PENDING:
+ type = "stp pending";
+ break;
+ case SAS_PHY_UNUSED:
+ type = "no device";
+ break;
+ case SAS_END_DEVICE:
+ if (phy->attached_iproto) {
+ if (phy->attached_tproto)
+ type = "host+target";
+ else
+ type = "host";
+ } else {
+ if (dr->attached_sata_dev)
+ type = "stp";
+ else
+ type = "ssp";
+ }
+ break;
+ case SAS_EDGE_EXPANDER_DEVICE:
+ case SAS_FANOUT_EXPANDER_DEVICE:
+ type = "smp";
+ break;
+ default:
+ type = "unknown";
+ }
+
+ /* this routine is polled by libata error recovery so filter
+ * unimportant messages
+ */
+ if (new_phy || phy->attached_dev_type != dev_type ||
+ phy->linkrate != linkrate ||
+ SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
+ /* pass */;
+ else
+ return;
+
+ /* if the attached device type changed and ata_eh is active,
+ * make sure we run revalidation when eh completes (see:
+ * sas_enable_revalidation)
+ */
+ if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
+ set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);
+
+ SAS_DPRINTK("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
+ test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
+ SAS_ADDR(dev->sas_addr), phy->phy_id,
+ sas_route_char(dev, phy), phy->linkrate,
+ SAS_ADDR(phy->attached_sas_addr), type);
+}
+
+/* check if we have an existing attached ata device on this expander phy */
+struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
+{
+ struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
+ struct domain_device *dev;
+ struct sas_rphy *rphy;
+
+ if (!ex_phy->port)
+ return NULL;
+
+ rphy = ex_phy->port->rphy;
+ if (!rphy)
+ return NULL;
+
+ dev = sas_find_dev_by_rphy(rphy);
+
+ if (dev && dev_is_sata(dev))
+ return dev;
+
+ return NULL;
+}
+
+#define DISCOVER_REQ_SIZE 16
+#define DISCOVER_RESP_SIZE 56
+
+static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
+ u8 *disc_resp, int single)
+{
+ struct discover_resp *dr;
+ int res;
+
+ disc_req[9] = single;
+
+ res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
+ disc_resp, DISCOVER_RESP_SIZE);
+ if (res)
+ return res;
+ dr = &((struct smp_resp *)disc_resp)->disc;
+ if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
+ sas_printk("Found loopback topology, just ignore it!\n");
+ return 0;
+ }
+ sas_set_ex_phy(dev, single, disc_resp);
+ return 0;
+}
+
+int sas_ex_phy_discover(struct domain_device *dev, int single)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int res = 0;
+ u8 *disc_req;
+ u8 *disc_resp;
+
+ disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
+ if (!disc_req)
+ return -ENOMEM;
+
+ disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
+ if (!disc_resp) {
+ kfree(disc_req);
+ return -ENOMEM;
+ }
+
+ disc_req[1] = SMP_DISCOVER;
+
+ if (0 <= single && single < ex->num_phys) {
+ res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
+ } else {
+ int i;
+
+ for (i = 0; i < ex->num_phys; i++) {
+ res = sas_ex_phy_discover_helper(dev, disc_req,
+ disc_resp, i);
+ if (res)
+ goto out_err;
+ }
+ }
+out_err:
+ kfree(disc_resp);
+ kfree(disc_req);
+ return res;
+}
+
+static int sas_expander_discover(struct domain_device *dev)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int res = -ENOMEM;
+
+ ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
+ if (!ex->ex_phy)
+ return -ENOMEM;
+
+ res = sas_ex_phy_discover(dev, -1);
+ if (res)
+ goto out_err;
+
+ return 0;
+ out_err:
+ kfree(ex->ex_phy);
+ ex->ex_phy = NULL;
+ return res;
+}
+
+#define MAX_EXPANDER_PHYS 128
+
+static void ex_assign_report_general(struct domain_device *dev,
+ struct smp_resp *resp)
+{
+ struct report_general_resp *rg = &resp->rg;
+
+ dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
+ dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
+ dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
+ dev->ex_dev.t2t_supp = rg->t2t_supp;
+ dev->ex_dev.conf_route_table = rg->conf_route_table;
+ dev->ex_dev.configuring = rg->configuring;
+ memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
+}
+
+#define RG_REQ_SIZE 8
+#define RG_RESP_SIZE 32
+
+static int sas_ex_general(struct domain_device *dev)
+{
+ u8 *rg_req;
+ struct smp_resp *rg_resp;
+ int res;
+ int i;
+
+ rg_req = alloc_smp_req(RG_REQ_SIZE);
+ if (!rg_req)
+ return -ENOMEM;
+
+ rg_resp = alloc_smp_resp(RG_RESP_SIZE);
+ if (!rg_resp) {
+ kfree(rg_req);
+ return -ENOMEM;
+ }
+
+ rg_req[1] = SMP_REPORT_GENERAL;
+
+ for (i = 0; i < 5; i++) {
+ res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
+ RG_RESP_SIZE);
+
+ if (res) {
+ SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
+ SAS_ADDR(dev->sas_addr), res);
+ goto out;
+ } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
+ SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
+ SAS_ADDR(dev->sas_addr), rg_resp->result);
+ res = rg_resp->result;
+ goto out;
+ }
+
+ ex_assign_report_general(dev, rg_resp);
+
+ if (dev->ex_dev.configuring) {
+ SAS_DPRINTK("RG: ex %llx self-configuring...\n",
+ SAS_ADDR(dev->sas_addr));
+ schedule_timeout_interruptible(5*HZ);
+ } else
+ break;
+ }
+out:
+ kfree(rg_req);
+ kfree(rg_resp);
+ return res;
+}
+
+static void ex_assign_manuf_info(struct domain_device *dev, void
+ *_mi_resp)
+{
+ u8 *mi_resp = _mi_resp;
+ struct sas_rphy *rphy = dev->rphy;
+ struct sas_expander_device *edev = rphy_to_expander_device(rphy);
+
+ memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
+ memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
+ memcpy(edev->product_rev, mi_resp + 36,
+ SAS_EXPANDER_PRODUCT_REV_LEN);
+
+ if (mi_resp[8] & 1) {
+ memcpy(edev->component_vendor_id, mi_resp + 40,
+ SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
+ edev->component_id = mi_resp[48] << 8 | mi_resp[49];
+ edev->component_revision_id = mi_resp[50];
+ }
+}
+
+#define MI_REQ_SIZE 8
+#define MI_RESP_SIZE 64
+
+static int sas_ex_manuf_info(struct domain_device *dev)
+{
+ u8 *mi_req;
+ u8 *mi_resp;
+ int res;
+
+ mi_req = alloc_smp_req(MI_REQ_SIZE);
+ if (!mi_req)
+ return -ENOMEM;
+
+ mi_resp = alloc_smp_resp(MI_RESP_SIZE);
+ if (!mi_resp) {
+ kfree(mi_req);
+ return -ENOMEM;
+ }
+
+ mi_req[1] = SMP_REPORT_MANUF_INFO;
+
+ res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
+ if (res) {
+ SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
+ SAS_ADDR(dev->sas_addr), res);
+ goto out;
+ } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
+ SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
+ SAS_ADDR(dev->sas_addr), mi_resp[2]);
+ goto out;
+ }
+
+ ex_assign_manuf_info(dev, mi_resp);
+out:
+ kfree(mi_req);
+ kfree(mi_resp);
+ return res;
+}
+
+#define PC_REQ_SIZE 44
+#define PC_RESP_SIZE 8
+
+int sas_smp_phy_control(struct domain_device *dev, int phy_id,
+ enum phy_func phy_func,
+ struct sas_phy_linkrates *rates)
+{
+ u8 *pc_req;
+ u8 *pc_resp;
+ int res;
+
+ pc_req = alloc_smp_req(PC_REQ_SIZE);
+ if (!pc_req)
+ return -ENOMEM;
+
+ pc_resp = alloc_smp_resp(PC_RESP_SIZE);
+ if (!pc_resp) {
+ kfree(pc_req);
+ return -ENOMEM;
+ }
+
+ pc_req[1] = SMP_PHY_CONTROL;
+ pc_req[9] = phy_id;
+ pc_req[10]= phy_func;
+ if (rates) {
+ pc_req[32] = rates->minimum_linkrate << 4;
+ pc_req[33] = rates->maximum_linkrate << 4;
+ }
+
+ res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
+
+ kfree(pc_resp);
+ kfree(pc_req);
+ return res;
+}
+
+static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ struct ex_phy *phy = &ex->ex_phy[phy_id];
+
+ sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
+ phy->linkrate = SAS_PHY_DISABLED;
+}
+
+static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int i;
+
+ for (i = 0; i < ex->num_phys; i++) {
+ struct ex_phy *phy = &ex->ex_phy[i];
+
+ if (phy->phy_state == PHY_VACANT ||
+ phy->phy_state == PHY_NOT_PRESENT)
+ continue;
+
+ if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
+ sas_ex_disable_phy(dev, i);
+ }
+}
+
+static int sas_dev_present_in_domain(struct asd_sas_port *port,
+ u8 *sas_addr)
+{
+ struct domain_device *dev;
+
+ if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
+ return 1;
+ list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+ if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
+ return 1;
+ }
+ return 0;
+}
+
+#define RPEL_REQ_SIZE 16
+#define RPEL_RESP_SIZE 32
+int sas_smp_get_phy_events(struct sas_phy *phy)
+{
+ int res;
+ u8 *req;
+ u8 *resp;
+ struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
+ struct domain_device *dev = sas_find_dev_by_rphy(rphy);
+
+ req = alloc_smp_req(RPEL_REQ_SIZE);
+ if (!req)
+ return -ENOMEM;
+
+ resp = alloc_smp_resp(RPEL_RESP_SIZE);
+ if (!resp) {
+ kfree(req);
+ return -ENOMEM;
+ }
+
+ req[1] = SMP_REPORT_PHY_ERR_LOG;
+ req[9] = phy->number;
+
+ res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
+ resp, RPEL_RESP_SIZE);
+
+ if (!res)
+ goto out;
+
+ phy->invalid_dword_count = scsi_to_u32(&resp[12]);
+ phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
+ phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
+ phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
+
+ out:
+ kfree(resp);
+ return res;
+
+}
+
+#ifdef CONFIG_SCSI_SAS_ATA
+
+#define RPS_REQ_SIZE 16
+#define RPS_RESP_SIZE 60
+
+int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
+ struct smp_resp *rps_resp)
+{
+ int res;
+ u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
+ u8 *resp = (u8 *)rps_resp;
+
+ if (!rps_req)
+ return -ENOMEM;
+
+ rps_req[1] = SMP_REPORT_PHY_SATA;
+ rps_req[9] = phy_id;
+
+ res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
+ rps_resp, RPS_RESP_SIZE);
+
+ /* 0x34 is the FIS type for the D2H fis. There's a potential
+ * standards cockup here. sas-2 explicitly specifies the FIS
+ * should be encoded so that FIS type is in resp[24].
+ * However, some expanders endian reverse this. Undo the
+ * reversal here */
+ if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
+ int i;
+
+ for (i = 0; i < 5; i++) {
+ int j = 24 + (i*4);
+ u8 a, b;
+ a = resp[j + 0];
+ b = resp[j + 1];
+ resp[j + 0] = resp[j + 3];
+ resp[j + 1] = resp[j + 2];
+ resp[j + 2] = b;
+ resp[j + 3] = a;
+ }
+ }
+
+ kfree(rps_req);
+ return res;
+}
+#endif
+
+static void sas_ex_get_linkrate(struct domain_device *parent,
+ struct domain_device *child,
+ struct ex_phy *parent_phy)
+{
+ struct expander_device *parent_ex = &parent->ex_dev;
+ struct sas_port *port;
+ int i;
+
+ child->pathways = 0;
+
+ port = parent_phy->port;
+
+ for (i = 0; i < parent_ex->num_phys; i++) {
+ struct ex_phy *phy = &parent_ex->ex_phy[i];
+
+ if (phy->phy_state == PHY_VACANT ||
+ phy->phy_state == PHY_NOT_PRESENT)
+ continue;
+
+ if (SAS_ADDR(phy->attached_sas_addr) ==
+ SAS_ADDR(child->sas_addr)) {
+
+ child->min_linkrate = min(parent->min_linkrate,
+ phy->linkrate);
+ child->max_linkrate = max(parent->max_linkrate,
+ phy->linkrate);
+ child->pathways++;
+ sas_port_add_phy(port, phy->phy);
+ }
+ }
+ child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
+ child->pathways = min(child->pathways, parent->pathways);
+}
+
+static struct domain_device *sas_ex_discover_end_dev(
+ struct domain_device *parent, int phy_id)
+{
+ struct expander_device *parent_ex = &parent->ex_dev;
+ struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
+ struct domain_device *child = NULL;
+ struct sas_rphy *rphy;
+ int res;
+
+ if (phy->attached_sata_host || phy->attached_sata_ps)
+ return NULL;
+
+ child = sas_alloc_device();
+ if (!child)
+ return NULL;
+
+ kref_get(&parent->kref);
+ child->parent = parent;
+ child->port = parent->port;
+ child->iproto = phy->attached_iproto;
+ memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
+ sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
+ if (!phy->port) {
+ phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
+ if (unlikely(!phy->port))
+ goto out_err;
+ if (unlikely(sas_port_add(phy->port) != 0)) {
+ sas_port_free(phy->port);
+ goto out_err;
+ }
+ }
+ sas_ex_get_linkrate(parent, child, phy);
+ sas_device_set_phy(child, phy->port);
+
+#ifdef CONFIG_SCSI_SAS_ATA
+ if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
+ res = sas_get_ata_info(child, phy);
+ if (res)
+ goto out_free;
+
+ sas_init_dev(child);
+ res = sas_ata_init(child);
+ if (res)
+ goto out_free;
+ rphy = sas_end_device_alloc(phy->port);
+ if (!rphy)
+ goto out_free;
+
+ child->rphy = rphy;
+ get_device(&rphy->dev);
+
+ list_add_tail(&child->disco_list_node, &parent->port->disco_list);
+
+ res = sas_discover_sata(child);
+ if (res) {
+ SAS_DPRINTK("sas_discover_sata() for device %16llx at "
+ "%016llx:0x%x returned 0x%x\n",
+ SAS_ADDR(child->sas_addr),
+ SAS_ADDR(parent->sas_addr), phy_id, res);
+ goto out_list_del;
+ }
+ } else
+#endif
+ if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
+ child->dev_type = SAS_END_DEVICE;
+ rphy = sas_end_device_alloc(phy->port);
+ /* FIXME: error handling */
+ if (unlikely(!rphy))
+ goto out_free;
+ child->tproto = phy->attached_tproto;
+ sas_init_dev(child);
+
+ child->rphy = rphy;
+ get_device(&rphy->dev);
+ sas_fill_in_rphy(child, rphy);
+
+ list_add_tail(&child->disco_list_node, &parent->port->disco_list);
+
+ res = sas_discover_end_dev(child);
+ if (res) {
+ SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
+ "at %016llx:0x%x returned 0x%x\n",
+ SAS_ADDR(child->sas_addr),
+ SAS_ADDR(parent->sas_addr), phy_id, res);
+ goto out_list_del;
+ }
+ } else {
+ SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
+ phy->attached_tproto, SAS_ADDR(parent->sas_addr),
+ phy_id);
+ goto out_free;
+ }
+
+ list_add_tail(&child->siblings, &parent_ex->children);
+ return child;
+
+ out_list_del:
+ sas_rphy_free(child->rphy);
+ list_del(&child->disco_list_node);
+ spin_lock_irq(&parent->port->dev_list_lock);
+ list_del(&child->dev_list_node);
+ spin_unlock_irq(&parent->port->dev_list_lock);
+ out_free:
+ sas_port_delete(phy->port);
+ out_err:
+ phy->port = NULL;
+ sas_put_device(child);
+ return NULL;
+}
+
+/* See if this phy is part of a wide port */
+static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
+{
+ struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
+ int i;
+
+ for (i = 0; i < parent->ex_dev.num_phys; i++) {
+ struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
+
+ if (ephy == phy)
+ continue;
+
+ if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
+ SAS_ADDR_SIZE) && ephy->port) {
+ sas_port_add_phy(ephy->port, phy->phy);
+ phy->port = ephy->port;
+ phy->phy_state = PHY_DEVICE_DISCOVERED;
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static struct domain_device *sas_ex_discover_expander(
+ struct domain_device *parent, int phy_id)
+{
+ struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
+ struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
+ struct domain_device *child = NULL;
+ struct sas_rphy *rphy;
+ struct sas_expander_device *edev;
+ struct asd_sas_port *port;
+ int res;
+
+ if (phy->routing_attr == DIRECT_ROUTING) {
+ SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
+ "allowed\n",
+ SAS_ADDR(parent->sas_addr), phy_id,
+ SAS_ADDR(phy->attached_sas_addr),
+ phy->attached_phy_id);
+ return NULL;
+ }
+ child = sas_alloc_device();
+ if (!child)
+ return NULL;
+
+ phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
+ /* FIXME: better error handling */
+ BUG_ON(sas_port_add(phy->port) != 0);
+
+
+ switch (phy->attached_dev_type) {
+ case SAS_EDGE_EXPANDER_DEVICE:
+ rphy = sas_expander_alloc(phy->port,
+ SAS_EDGE_EXPANDER_DEVICE);
+ break;
+ case SAS_FANOUT_EXPANDER_DEVICE:
+ rphy = sas_expander_alloc(phy->port,
+ SAS_FANOUT_EXPANDER_DEVICE);
+ break;
+ default:
+ rphy = NULL; /* shut gcc up */
+ BUG();
+ }
+ port = parent->port;
+ child->rphy = rphy;
+ get_device(&rphy->dev);
+ edev = rphy_to_expander_device(rphy);
+ child->dev_type = phy->attached_dev_type;
+ kref_get(&parent->kref);
+ child->parent = parent;
+ child->port = port;
+ child->iproto = phy->attached_iproto;
+ child->tproto = phy->attached_tproto;
+ memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
+ sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
+ sas_ex_get_linkrate(parent, child, phy);
+ edev->level = parent_ex->level + 1;
+ parent->port->disc.max_level = max(parent->port->disc.max_level,
+ edev->level);
+ sas_init_dev(child);
+ sas_fill_in_rphy(child, rphy);
+ sas_rphy_add(rphy);
+
+ spin_lock_irq(&parent->port->dev_list_lock);
+ list_add_tail(&child->dev_list_node, &parent->port->dev_list);
+ spin_unlock_irq(&parent->port->dev_list_lock);
+
+ res = sas_discover_expander(child);
+ if (res) {
+ sas_rphy_delete(rphy);
+ spin_lock_irq(&parent->port->dev_list_lock);
+ list_del(&child->dev_list_node);
+ spin_unlock_irq(&parent->port->dev_list_lock);
+ sas_put_device(child);
+ return NULL;
+ }
+ list_add_tail(&child->siblings, &parent->ex_dev.children);
+ return child;
+}
+
+static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
+ struct domain_device *child = NULL;
+ int res = 0;
+
+ /* Phy state */
+ if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
+ if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
+ res = sas_ex_phy_discover(dev, phy_id);
+ if (res)
+ return res;
+ }
+
+ /* Parent and domain coherency */
+ if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
+ SAS_ADDR(dev->port->sas_addr))) {
+ sas_add_parent_port(dev, phy_id);
+ return 0;
+ }
+ if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
+ SAS_ADDR(dev->parent->sas_addr))) {
+ sas_add_parent_port(dev, phy_id);
+ if (ex_phy->routing_attr == TABLE_ROUTING)
+ sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
+ return 0;
+ }
+
+ if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
+ sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
+
+ if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {
+ if (ex_phy->routing_attr == DIRECT_ROUTING) {
+ memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
+ sas_configure_routing(dev, ex_phy->attached_sas_addr);
+ }
+ return 0;
+ } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
+ return 0;
+
+ if (ex_phy->attached_dev_type != SAS_END_DEVICE &&
+ ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&
+ ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&
+ ex_phy->attached_dev_type != SAS_SATA_PENDING) {
+ SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
+ "phy 0x%x\n", ex_phy->attached_dev_type,
+ SAS_ADDR(dev->sas_addr),
+ phy_id);
+ return 0;
+ }
+
+ res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
+ if (res) {
+ SAS_DPRINTK("configure routing for dev %016llx "
+ "reported 0x%x. Forgotten\n",
+ SAS_ADDR(ex_phy->attached_sas_addr), res);
+ sas_disable_routing(dev, ex_phy->attached_sas_addr);
+ return res;
+ }
+
+ if (sas_ex_join_wide_port(dev, phy_id)) {
+ SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
+ phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
+ return res;
+ }
+
+ switch (ex_phy->attached_dev_type) {
+ case SAS_END_DEVICE:
+ case SAS_SATA_PENDING:
+ child = sas_ex_discover_end_dev(dev, phy_id);
+ break;
+ case SAS_FANOUT_EXPANDER_DEVICE:
+ if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
+ SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
+ "attached to ex %016llx phy 0x%x\n",
+ SAS_ADDR(ex_phy->attached_sas_addr),
+ ex_phy->attached_phy_id,
+ SAS_ADDR(dev->sas_addr),
+ phy_id);
+ sas_ex_disable_phy(dev, phy_id);
+ break;
+ } else
+ memcpy(dev->port->disc.fanout_sas_addr,
+ ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
+ /* fallthrough */
+ case SAS_EDGE_EXPANDER_DEVICE:
+ child = sas_ex_discover_expander(dev, phy_id);
+ break;
+ default:
+ break;
+ }
+
+ if (child) {
+ int i;
+
+ for (i = 0; i < ex->num_phys; i++) {
+ if (ex->ex_phy[i].phy_state == PHY_VACANT ||
+ ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
+ continue;
+ /*
+ * Due to races, the phy might not get added to the
+ * wide port, so we add the phy to the wide port here.
+ */
+ if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
+ SAS_ADDR(child->sas_addr)) {
+ ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
+ if (sas_ex_join_wide_port(dev, i))
+ SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
+ i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
+
+ }
+ }
+ }
+
+ return res;
+}
+
+static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int i;
+
+ for (i = 0; i < ex->num_phys; i++) {
+ struct ex_phy *phy = &ex->ex_phy[i];
+
+ if (phy->phy_state == PHY_VACANT ||
+ phy->phy_state == PHY_NOT_PRESENT)
+ continue;
+
+ if ((phy->attached_dev_type == SAS_EDGE_EXPANDER_DEVICE ||
+ phy->attached_dev_type == SAS_FANOUT_EXPANDER_DEVICE) &&
+ phy->routing_attr == SUBTRACTIVE_ROUTING) {
+
+ memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
+
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int sas_check_level_subtractive_boundary(struct domain_device *dev)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ struct domain_device *child;
+ u8 sub_addr[8] = {0, };
+
+ list_for_each_entry(child, &ex->children, siblings) {
+ if (child->dev_type != SAS_EDGE_EXPANDER_DEVICE &&
+ child->dev_type != SAS_FANOUT_EXPANDER_DEVICE)
+ continue;
+ if (sub_addr[0] == 0) {
+ sas_find_sub_addr(child, sub_addr);
+ continue;
+ } else {
+ u8 s2[8];
+
+ if (sas_find_sub_addr(child, s2) &&
+ (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
+
+ SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
+ "diverges from subtractive "
+ "boundary %016llx\n",
+ SAS_ADDR(dev->sas_addr),
+ SAS_ADDR(child->sas_addr),
+ SAS_ADDR(s2),
+ SAS_ADDR(sub_addr));
+
+ sas_ex_disable_port(child, s2);
+ }
+ }
+ }
+ return 0;
+}
+/**
+ * sas_ex_discover_devices -- discover devices attached to this expander
+ * dev: pointer to the expander domain device
+ * single: if you want to do a single phy, else set to -1;
+ *
+ * Configure this expander for use with its devices and register the
+ * devices of this expander.
+ */
+static int sas_ex_discover_devices(struct domain_device *dev, int single)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int i = 0, end = ex->num_phys;
+ int res = 0;
+
+ if (0 <= single && single < end) {
+ i = single;
+ end = i+1;
+ }
+
+ for ( ; i < end; i++) {
+ struct ex_phy *ex_phy = &ex->ex_phy[i];
+
+ if (ex_phy->phy_state == PHY_VACANT ||
+ ex_phy->phy_state == PHY_NOT_PRESENT ||
+ ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
+ continue;
+
+ switch (ex_phy->linkrate) {
+ case SAS_PHY_DISABLED:
+ case SAS_PHY_RESET_PROBLEM:
+ case SAS_SATA_PORT_SELECTOR:
+ continue;
+ default:
+ res = sas_ex_discover_dev(dev, i);
+ if (res)
+ break;
+ continue;
+ }
+ }
+
+ if (!res)
+ sas_check_level_subtractive_boundary(dev);
+
+ return res;
+}
+
+static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int i;
+ u8 *sub_sas_addr = NULL;
+
+ if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)
+ return 0;
+
+ for (i = 0; i < ex->num_phys; i++) {
+ struct ex_phy *phy = &ex->ex_phy[i];
+
+ if (phy->phy_state == PHY_VACANT ||
+ phy->phy_state == PHY_NOT_PRESENT)
+ continue;
+
+ if ((phy->attached_dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
+ phy->attached_dev_type == SAS_EDGE_EXPANDER_DEVICE) &&
+ phy->routing_attr == SUBTRACTIVE_ROUTING) {
+
+ if (!sub_sas_addr)
+ sub_sas_addr = &phy->attached_sas_addr[0];
+ else if (SAS_ADDR(sub_sas_addr) !=
+ SAS_ADDR(phy->attached_sas_addr)) {
+
+ SAS_DPRINTK("ex %016llx phy 0x%x "
+ "diverges(%016llx) on subtractive "
+ "boundary(%016llx). Disabled\n",
+ SAS_ADDR(dev->sas_addr), i,
+ SAS_ADDR(phy->attached_sas_addr),
+ SAS_ADDR(sub_sas_addr));
+ sas_ex_disable_phy(dev, i);
+ }
+ }
+ }
+ return 0;
+}
+
+static void sas_print_parent_topology_bug(struct domain_device *child,
+ struct ex_phy *parent_phy,
+ struct ex_phy *child_phy)
+{
+ static const char *ex_type[] = {
+ [SAS_EDGE_EXPANDER_DEVICE] = "edge",
+ [SAS_FANOUT_EXPANDER_DEVICE] = "fanout",
+ };
+ struct domain_device *parent = child->parent;
+
+ sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx "
+ "phy 0x%x has %c:%c routing link!\n",
+
+ ex_type[parent->dev_type],
+ SAS_ADDR(parent->sas_addr),
+ parent_phy->phy_id,
+
+ ex_type[child->dev_type],
+ SAS_ADDR(child->sas_addr),
+ child_phy->phy_id,
+
+ sas_route_char(parent, parent_phy),
+ sas_route_char(child, child_phy));
+}
+
+static int sas_check_eeds(struct domain_device *child,
+ struct ex_phy *parent_phy,
+ struct ex_phy *child_phy)
+{
+ int res = 0;
+ struct domain_device *parent = child->parent;
+
+ if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
+ res = -ENODEV;
+ SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
+ "phy S:0x%x, while there is a fanout ex %016llx\n",
+ SAS_ADDR(parent->sas_addr),
+ parent_phy->phy_id,
+ SAS_ADDR(child->sas_addr),
+ child_phy->phy_id,
+ SAS_ADDR(parent->port->disc.fanout_sas_addr));
+ } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
+ memcpy(parent->port->disc.eeds_a, parent->sas_addr,
+ SAS_ADDR_SIZE);
+ memcpy(parent->port->disc.eeds_b, child->sas_addr,
+ SAS_ADDR_SIZE);
+ } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
+ SAS_ADDR(parent->sas_addr)) ||
+ (SAS_ADDR(parent->port->disc.eeds_a) ==
+ SAS_ADDR(child->sas_addr)))
+ &&
+ ((SAS_ADDR(parent->port->disc.eeds_b) ==
+ SAS_ADDR(parent->sas_addr)) ||
+ (SAS_ADDR(parent->port->disc.eeds_b) ==
+ SAS_ADDR(child->sas_addr))))
+ ;
+ else {
+ res = -ENODEV;
+ SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
+ "phy 0x%x link forms a third EEDS!\n",
+ SAS_ADDR(parent->sas_addr),
+ parent_phy->phy_id,
+ SAS_ADDR(child->sas_addr),
+ child_phy->phy_id);
+ }
+
+ return res;
+}
+
+/* Here we spill over 80 columns. It is intentional.
+ */
+static int sas_check_parent_topology(struct domain_device *child)
+{
+ struct expander_device *child_ex = &child->ex_dev;
+ struct expander_device *parent_ex;
+ int i;
+ int res = 0;
+
+ if (!child->parent)
+ return 0;
+
+ if (child->parent->dev_type != SAS_EDGE_EXPANDER_DEVICE &&
+ child->parent->dev_type != SAS_FANOUT_EXPANDER_DEVICE)
+ return 0;
+
+ parent_ex = &child->parent->ex_dev;
+
+ for (i = 0; i < parent_ex->num_phys; i++) {
+ struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
+ struct ex_phy *child_phy;
+
+ if (parent_phy->phy_state == PHY_VACANT ||
+ parent_phy->phy_state == PHY_NOT_PRESENT)
+ continue;
+
+ if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
+ continue;
+
+ child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
+
+ switch (child->parent->dev_type) {
+ case SAS_EDGE_EXPANDER_DEVICE:
+ if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
+ if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
+ child_phy->routing_attr != TABLE_ROUTING) {
+ sas_print_parent_topology_bug(child, parent_phy, child_phy);
+ res = -ENODEV;
+ }
+ } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
+ if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
+ res = sas_check_eeds(child, parent_phy, child_phy);
+ } else if (child_phy->routing_attr != TABLE_ROUTING) {
+ sas_print_parent_topology_bug(child, parent_phy, child_phy);
+ res = -ENODEV;
+ }
+ } else if (parent_phy->routing_attr == TABLE_ROUTING) {
+ if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
+ (child_phy->routing_attr == TABLE_ROUTING &&
+ child_ex->t2t_supp && parent_ex->t2t_supp)) {
+ /* All good */;
+ } else {
+ sas_print_parent_topology_bug(child, parent_phy, child_phy);
+ res = -ENODEV;
+ }
+ }
+ break;
+ case SAS_FANOUT_EXPANDER_DEVICE:
+ if (parent_phy->routing_attr != TABLE_ROUTING ||
+ child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
+ sas_print_parent_topology_bug(child, parent_phy, child_phy);
+ res = -ENODEV;
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ return res;
+}
+
+#define RRI_REQ_SIZE 16
+#define RRI_RESP_SIZE 44
+
+static int sas_configure_present(struct domain_device *dev, int phy_id,
+ u8 *sas_addr, int *index, int *present)
+{
+ int i, res = 0;
+ struct expander_device *ex = &dev->ex_dev;
+ struct ex_phy *phy = &ex->ex_phy[phy_id];
+ u8 *rri_req;
+ u8 *rri_resp;
+
+ *present = 0;
+ *index = 0;
+
+ rri_req = alloc_smp_req(RRI_REQ_SIZE);
+ if (!rri_req)
+ return -ENOMEM;
+
+ rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
+ if (!rri_resp) {
+ kfree(rri_req);
+ return -ENOMEM;
+ }
+
+ rri_req[1] = SMP_REPORT_ROUTE_INFO;
+ rri_req[9] = phy_id;
+
+ for (i = 0; i < ex->max_route_indexes ; i++) {
+ *(__be16 *)(rri_req+6) = cpu_to_be16(i);
+ res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
+ RRI_RESP_SIZE);
+ if (res)
+ goto out;
+ res = rri_resp[2];
+ if (res == SMP_RESP_NO_INDEX) {
+ SAS_DPRINTK("overflow of indexes: dev %016llx "
+ "phy 0x%x index 0x%x\n",
+ SAS_ADDR(dev->sas_addr), phy_id, i);
+ goto out;
+ } else if (res != SMP_RESP_FUNC_ACC) {
+ SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
+ "result 0x%x\n", __func__,
+ SAS_ADDR(dev->sas_addr), phy_id, i, res);
+ goto out;
+ }
+ if (SAS_ADDR(sas_addr) != 0) {
+ if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
+ *index = i;
+ if ((rri_resp[12] & 0x80) == 0x80)
+ *present = 0;
+ else
+ *present = 1;
+ goto out;
+ } else if (SAS_ADDR(rri_resp+16) == 0) {
+ *index = i;
+ *present = 0;
+ goto out;
+ }
+ } else if (SAS_ADDR(rri_resp+16) == 0 &&
+ phy->last_da_index < i) {
+ phy->last_da_index = i;
+ *index = i;
+ *present = 0;
+ goto out;
+ }
+ }
+ res = -1;
+out:
+ kfree(rri_req);
+ kfree(rri_resp);
+ return res;
+}
+
+#define CRI_REQ_SIZE 44
+#define CRI_RESP_SIZE 8
+
+static int sas_configure_set(struct domain_device *dev, int phy_id,
+ u8 *sas_addr, int index, int include)
+{
+ int res;
+ u8 *cri_req;
+ u8 *cri_resp;
+
+ cri_req = alloc_smp_req(CRI_REQ_SIZE);
+ if (!cri_req)
+ return -ENOMEM;
+
+ cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
+ if (!cri_resp) {
+ kfree(cri_req);
+ return -ENOMEM;
+ }
+
+ cri_req[1] = SMP_CONF_ROUTE_INFO;
+ *(__be16 *)(cri_req+6) = cpu_to_be16(index);
+ cri_req[9] = phy_id;
+ if (SAS_ADDR(sas_addr) == 0 || !include)
+ cri_req[12] |= 0x80;
+ memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
+
+ res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
+ CRI_RESP_SIZE);
+ if (res)
+ goto out;
+ res = cri_resp[2];
+ if (res == SMP_RESP_NO_INDEX) {
+ SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
+ "index 0x%x\n",
+ SAS_ADDR(dev->sas_addr), phy_id, index);
+ }
+out:
+ kfree(cri_req);
+ kfree(cri_resp);
+ return res;
+}
+
+static int sas_configure_phy(struct domain_device *dev, int phy_id,
+ u8 *sas_addr, int include)
+{
+ int index;
+ int present;
+ int res;
+
+ res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
+ if (res)
+ return res;
+ if (include ^ present)
+ return sas_configure_set(dev, phy_id, sas_addr, index,include);
+
+ return res;
+}
+
+/**
+ * sas_configure_parent -- configure routing table of parent
+ * parent: parent expander
+ * child: child expander
+ * sas_addr: SAS port identifier of device directly attached to child
+ */
+static int sas_configure_parent(struct domain_device *parent,
+ struct domain_device *child,
+ u8 *sas_addr, int include)
+{
+ struct expander_device *ex_parent = &parent->ex_dev;
+ int res = 0;
+ int i;
+
+ if (parent->parent) {
+ res = sas_configure_parent(parent->parent, parent, sas_addr,
+ include);
+ if (res)
+ return res;
+ }
+
+ if (ex_parent->conf_route_table == 0) {
+ SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
+ SAS_ADDR(parent->sas_addr));
+ return 0;
+ }
+
+ for (i = 0; i < ex_parent->num_phys; i++) {
+ struct ex_phy *phy = &ex_parent->ex_phy[i];
+
+ if ((phy->routing_attr == TABLE_ROUTING) &&
+ (SAS_ADDR(phy->attached_sas_addr) ==
+ SAS_ADDR(child->sas_addr))) {
+ res = sas_configure_phy(parent, i, sas_addr, include);
+ if (res)
+ return res;
+ }
+ }
+
+ return res;
+}
+
+/**
+ * sas_configure_routing -- configure routing
+ * dev: expander device
+ * sas_addr: port identifier of device directly attached to the expander device
+ */
+static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
+{
+ if (dev->parent)
+ return sas_configure_parent(dev->parent, dev, sas_addr, 1);
+ return 0;
+}
+
+static int sas_disable_routing(struct domain_device *dev, u8 *sas_addr)
+{
+ if (dev->parent)
+ return sas_configure_parent(dev->parent, dev, sas_addr, 0);
+ return 0;
+}
+
+/**
+ * sas_discover_expander -- expander discovery
+ * @ex: pointer to expander domain device
+ *
+ * See comment in sas_discover_sata().
+ */
+static int sas_discover_expander(struct domain_device *dev)
+{
+ int res;
+
+ res = sas_notify_lldd_dev_found(dev);
+ if (res)
+ return res;
+
+ res = sas_ex_general(dev);
+ if (res)
+ goto out_err;
+ res = sas_ex_manuf_info(dev);
+ if (res)
+ goto out_err;
+
+ res = sas_expander_discover(dev);
+ if (res) {
+ SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
+ SAS_ADDR(dev->sas_addr), res);
+ goto out_err;
+ }
+
+ sas_check_ex_subtractive_boundary(dev);
+ res = sas_check_parent_topology(dev);
+ if (res)
+ goto out_err;
+ return 0;
+out_err:
+ sas_notify_lldd_dev_gone(dev);
+ return res;
+}
+
+static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
+{
+ int res = 0;
+ struct domain_device *dev;
+
+ list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+ if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
+ dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
+ struct sas_expander_device *ex =
+ rphy_to_expander_device(dev->rphy);
+
+ if (level == ex->level)
+ res = sas_ex_discover_devices(dev, -1);
+ else if (level > 0)
+ res = sas_ex_discover_devices(port->port_dev, -1);
+
+ }
+ }
+
+ return res;
+}
+
+static int sas_ex_bfs_disc(struct asd_sas_port *port)
+{
+ int res;
+ int level;
+
+ do {
+ level = port->disc.max_level;
+ res = sas_ex_level_discovery(port, level);
+ mb();
+ } while (level < port->disc.max_level);
+
+ return res;
+}
+
+int sas_discover_root_expander(struct domain_device *dev)
+{
+ int res;
+ struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
+
+ res = sas_rphy_add(dev->rphy);
+ if (res)
+ goto out_err;
+
+ ex->level = dev->port->disc.max_level; /* 0 */
+ res = sas_discover_expander(dev);
+ if (res)
+ goto out_err2;
+
+ sas_ex_bfs_disc(dev->port);
+
+ return res;
+
+out_err2:
+ sas_rphy_remove(dev->rphy);
+out_err:
+ return res;
+}
+
+/* ---------- Domain revalidation ---------- */
+
+static int sas_get_phy_discover(struct domain_device *dev,
+ int phy_id, struct smp_resp *disc_resp)
+{
+ int res;
+ u8 *disc_req;
+
+ disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
+ if (!disc_req)
+ return -ENOMEM;
+
+ disc_req[1] = SMP_DISCOVER;
+ disc_req[9] = phy_id;
+
+ res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
+ disc_resp, DISCOVER_RESP_SIZE);
+ if (res)
+ goto out;
+ else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
+ res = disc_resp->result;
+ goto out;
+ }
+out:
+ kfree(disc_req);
+ return res;
+}
+
+static int sas_get_phy_change_count(struct domain_device *dev,
+ int phy_id, int *pcc)
+{
+ int res;
+ struct smp_resp *disc_resp;
+
+ disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
+ if (!disc_resp)
+ return -ENOMEM;
+
+ res = sas_get_phy_discover(dev, phy_id, disc_resp);
+ if (!res)
+ *pcc = disc_resp->disc.change_count;
+
+ kfree(disc_resp);
+ return res;
+}
+
+static int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
+ u8 *sas_addr, enum sas_device_type *type)
+{
+ int res;
+ struct smp_resp *disc_resp;
+ struct discover_resp *dr;
+
+ disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
+ if (!disc_resp)
+ return -ENOMEM;
+ dr = &disc_resp->disc;
+
+ res = sas_get_phy_discover(dev, phy_id, disc_resp);
+ if (res == 0) {
+ memcpy(sas_addr, disc_resp->disc.attached_sas_addr, 8);
+ *type = to_dev_type(dr);
+ if (*type == 0)
+ memset(sas_addr, 0, 8);
+ }
+ kfree(disc_resp);
+ return res;
+}
+
+static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
+ int from_phy, bool update)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int res = 0;
+ int i;
+
+ for (i = from_phy; i < ex->num_phys; i++) {
+ int phy_change_count = 0;
+
+ res = sas_get_phy_change_count(dev, i, &phy_change_count);
+ switch (res) {
+ case SMP_RESP_PHY_VACANT:
+ case SMP_RESP_NO_PHY:
+ continue;
+ case SMP_RESP_FUNC_ACC:
+ break;
+ default:
+ return res;
+ }
+
+ if (phy_change_count != ex->ex_phy[i].phy_change_count) {
+ if (update)
+ ex->ex_phy[i].phy_change_count =
+ phy_change_count;
+ *phy_id = i;
+ return 0;
+ }
+ }
+ return 0;
+}
+
+static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
+{
+ int res;
+ u8 *rg_req;
+ struct smp_resp *rg_resp;
+
+ rg_req = alloc_smp_req(RG_REQ_SIZE);
+ if (!rg_req)
+ return -ENOMEM;
+
+ rg_resp = alloc_smp_resp(RG_RESP_SIZE);
+ if (!rg_resp) {
+ kfree(rg_req);
+ return -ENOMEM;
+ }
+
+ rg_req[1] = SMP_REPORT_GENERAL;
+
+ res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
+ RG_RESP_SIZE);
+ if (res)
+ goto out;
+ if (rg_resp->result != SMP_RESP_FUNC_ACC) {
+ res = rg_resp->result;
+ goto out;
+ }
+
+ *ecc = be16_to_cpu(rg_resp->rg.change_count);
+out:
+ kfree(rg_resp);
+ kfree(rg_req);
+ return res;
+}
+/**
+ * sas_find_bcast_dev - find the device issue BROADCAST(CHANGE).
+ * @dev:domain device to be detect.
+ * @src_dev: the device which originated BROADCAST(CHANGE).
+ *
+ * Add self-configuration expander support. Suppose two expander cascading,
+ * when the first level expander is self-configuring, hotplug the disks in
+ * second level expander, BROADCAST(CHANGE) will not only be originated
+ * in the second level expander, but also be originated in the first level
+ * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
+ * expander changed count in two level expanders will all increment at least
+ * once, but the phy which chang count has changed is the source device which
+ * we concerned.
+ */
+
+static int sas_find_bcast_dev(struct domain_device *dev,
+ struct domain_device **src_dev)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ int ex_change_count = -1;
+ int phy_id = -1;
+ int res;
+ struct domain_device *ch;
+
+ res = sas_get_ex_change_count(dev, &ex_change_count);
+ if (res)
+ goto out;
+ if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
+ /* Just detect if this expander phys phy change count changed,
+ * in order to determine if this expander originate BROADCAST,
+ * and do not update phy change count field in our structure.
+ */
+ res = sas_find_bcast_phy(dev, &phy_id, 0, false);
+ if (phy_id != -1) {
+ *src_dev = dev;
+ ex->ex_change_count = ex_change_count;
+ SAS_DPRINTK("Expander phy change count has changed\n");
+ return res;
+ } else
+ SAS_DPRINTK("Expander phys DID NOT change\n");
+ }
+ list_for_each_entry(ch, &ex->children, siblings) {
+ if (ch->dev_type == SAS_EDGE_EXPANDER_DEVICE || ch->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
+ res = sas_find_bcast_dev(ch, src_dev);
+ if (*src_dev)
+ return res;
+ }
+ }
+out:
+ return res;
+}
+
+static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ struct domain_device *child, *n;
+
+ list_for_each_entry_safe(child, n, &ex->children, siblings) {
+ set_bit(SAS_DEV_GONE, &child->state);
+ if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
+ child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
+ sas_unregister_ex_tree(port, child);
+ else
+ sas_unregister_dev(port, child);
+ }
+ sas_unregister_dev(port, dev);
+}
+
+static void sas_unregister_devs_sas_addr(struct domain_device *parent,
+ int phy_id, bool last)
+{
+ struct expander_device *ex_dev = &parent->ex_dev;
+ struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
+ struct domain_device *child, *n, *found = NULL;
+ if (last) {
+ list_for_each_entry_safe(child, n,
+ &ex_dev->children, siblings) {
+ if (SAS_ADDR(child->sas_addr) ==
+ SAS_ADDR(phy->attached_sas_addr)) {
+ set_bit(SAS_DEV_GONE, &child->state);
+ if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
+ child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
+ sas_unregister_ex_tree(parent->port, child);
+ else
+ sas_unregister_dev(parent->port, child);
+ found = child;
+ break;
+ }
+ }
+ sas_disable_routing(parent, phy->attached_sas_addr);
+ }
+ memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
+ if (phy->port) {
+ sas_port_delete_phy(phy->port, phy->phy);
+ sas_device_set_phy(found, phy->port);
+ if (phy->port->num_phys == 0)
+ sas_port_delete(phy->port);
+ phy->port = NULL;
+ }
+}
+
+static int sas_discover_bfs_by_root_level(struct domain_device *root,
+ const int level)
+{
+ struct expander_device *ex_root = &root->ex_dev;
+ struct domain_device *child;
+ int res = 0;
+
+ list_for_each_entry(child, &ex_root->children, siblings) {
+ if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
+ child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
+ struct sas_expander_device *ex =
+ rphy_to_expander_device(child->rphy);
+
+ if (level > ex->level)
+ res = sas_discover_bfs_by_root_level(child,
+ level);
+ else if (level == ex->level)
+ res = sas_ex_discover_devices(child, -1);
+ }
+ }
+ return res;
+}
+
+static int sas_discover_bfs_by_root(struct domain_device *dev)
+{
+ int res;
+ struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
+ int level = ex->level+1;
+
+ res = sas_ex_discover_devices(dev, -1);
+ if (res)
+ goto out;
+ do {
+ res = sas_discover_bfs_by_root_level(dev, level);
+ mb();
+ level += 1;
+ } while (level <= dev->port->disc.max_level);
+out:
+ return res;
+}
+
+static int sas_discover_new(struct domain_device *dev, int phy_id)
+{
+ struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
+ struct domain_device *child;
+ int res;
+
+ SAS_DPRINTK("ex %016llx phy%d new device attached\n",
+ SAS_ADDR(dev->sas_addr), phy_id);
+ res = sas_ex_phy_discover(dev, phy_id);
+ if (res)
+ return res;
+
+ if (sas_ex_join_wide_port(dev, phy_id))
+ return 0;
+
+ res = sas_ex_discover_devices(dev, phy_id);
+ if (res)
+ return res;
+ list_for_each_entry(child, &dev->ex_dev.children, siblings) {
+ if (SAS_ADDR(child->sas_addr) ==
+ SAS_ADDR(ex_phy->attached_sas_addr)) {
+ if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
+ child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
+ res = sas_discover_bfs_by_root(child);
+ break;
+ }
+ }
+ return res;
+}
+
+static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)
+{
+ if (old == new)
+ return true;
+
+ /* treat device directed resets as flutter, if we went
+ * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery
+ */
+ if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||
+ (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))
+ return true;
+
+ return false;
+}
+
+static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ struct ex_phy *phy = &ex->ex_phy[phy_id];
+ enum sas_device_type type = SAS_PHY_UNUSED;
+ u8 sas_addr[8];
+ int res;
+
+ memset(sas_addr, 0, 8);
+ res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
+ switch (res) {
+ case SMP_RESP_NO_PHY:
+ phy->phy_state = PHY_NOT_PRESENT;
+ sas_unregister_devs_sas_addr(dev, phy_id, last);
+ return res;
+ case SMP_RESP_PHY_VACANT:
+ phy->phy_state = PHY_VACANT;
+ sas_unregister_devs_sas_addr(dev, phy_id, last);
+ return res;
+ case SMP_RESP_FUNC_ACC:
+ break;
+ case -ECOMM:
+ break;
+ default:
+ return res;
+ }
+
+ if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
+ phy->phy_state = PHY_EMPTY;
+ sas_unregister_devs_sas_addr(dev, phy_id, last);
+ return res;
+ } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
+ dev_type_flutter(type, phy->attached_dev_type)) {
+ struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
+ char *action = "";
+
+ sas_ex_phy_discover(dev, phy_id);
+
+ if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)
+ action = ", needs recovery";
+ SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter%s\n",
+ SAS_ADDR(dev->sas_addr), phy_id, action);
+ return res;
+ }
+
+ /* delete the old link */
+ if (SAS_ADDR(phy->attached_sas_addr) &&
+ SAS_ADDR(sas_addr) != SAS_ADDR(phy->attached_sas_addr)) {
+ SAS_DPRINTK("ex %016llx phy 0x%x replace %016llx\n",
+ SAS_ADDR(dev->sas_addr), phy_id,
+ SAS_ADDR(phy->attached_sas_addr));
+ sas_unregister_devs_sas_addr(dev, phy_id, last);
+ }
+
+ return sas_discover_new(dev, phy_id);
+}
+
+/**
+ * sas_rediscover - revalidate the domain.
+ * @dev:domain device to be detect.
+ * @phy_id: the phy id will be detected.
+ *
+ * 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.For plugging out, we un-register the device only when it is
+ * the last phy in the port, for other phys in this port, we just delete it
+ * from the port.For inserting, we do discovery when it is the
+ * first phy,for other phys in this port, we add it to the port to
+ * forming the wide-port.
+ */
+static int sas_rediscover(struct domain_device *dev, const int phy_id)
+{
+ struct expander_device *ex = &dev->ex_dev;
+ struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
+ int res = 0;
+ int i;
+ bool last = true; /* is this the last phy of the port */
+
+ SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
+ SAS_ADDR(dev->sas_addr), phy_id);
+
+ if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
+ for (i = 0; i < ex->num_phys; i++) {
+ struct ex_phy *phy = &ex->ex_phy[i];
+
+ if (i == phy_id)
+ continue;
+ if (SAS_ADDR(phy->attached_sas_addr) ==
+ SAS_ADDR(changed_phy->attached_sas_addr)) {
+ SAS_DPRINTK("phy%d part of wide port with "
+ "phy%d\n", phy_id, i);
+ last = false;
+ break;
+ }
+ }
+ res = sas_rediscover_dev(dev, phy_id, last);
+ } else
+ res = sas_discover_new(dev, phy_id);
+ return res;
+}
+
+/**
+ * sas_revalidate_domain -- revalidate 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.
+ */
+int sas_ex_revalidate_domain(struct domain_device *port_dev)
+{
+ int res;
+ struct domain_device *dev = NULL;
+
+ res = sas_find_bcast_dev(port_dev, &dev);
+ while (res == 0 && dev) {
+ struct expander_device *ex = &dev->ex_dev;
+ int i = 0, phy_id;
+
+ do {
+ phy_id = -1;
+ res = sas_find_bcast_phy(dev, &phy_id, i, true);
+ if (phy_id == -1)
+ break;
+ res = sas_rediscover(dev, phy_id);
+ i = phy_id + 1;
+ } while (i < ex->num_phys);
+
+ dev = NULL;
+ res = sas_find_bcast_dev(port_dev, &dev);
+ }
+ return res;
+}
+
+int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
+ struct request *req)
+{
+ struct domain_device *dev;
+ int ret, type;
+ struct request *rsp = req->next_rq;
+
+ if (!rsp) {
+ printk("%s: space for a smp response is missing\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ /* no rphy means no smp target support (ie aic94xx host) */
+ if (!rphy)
+ return sas_smp_host_handler(shost, req, rsp);
+
+ type = rphy->identify.device_type;
+
+ if (type != SAS_EDGE_EXPANDER_DEVICE &&
+ type != SAS_FANOUT_EXPANDER_DEVICE) {
+ printk("%s: can we send a smp request to a device?\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ dev = sas_find_dev_by_rphy(rphy);
+ if (!dev) {
+ printk("%s: fail to find a domain_device?\n", __func__);
+ return -EINVAL;
+ }
+
+ /* do we need to support multiple segments? */
+ if (bio_multiple_segments(req->bio) ||
+ bio_multiple_segments(rsp->bio)) {
+ printk("%s: multiple segments req %u, rsp %u\n",
+ __func__, blk_rq_bytes(req), blk_rq_bytes(rsp));
+ return -EINVAL;
+ }
+
+ ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
+ bio_data(rsp->bio), blk_rq_bytes(rsp));
+ if (ret > 0) {
+ /* positive number is the untransferred residual */
+ rsp->resid_len = ret;
+ req->resid_len = 0;
+ ret = 0;
+ } else if (ret == 0) {
+ rsp->resid_len = 0;
+ req->resid_len = 0;
+ }
+
+ return ret;
+}
Code Review / kvmfornfv.git / blobdiff