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path: root/drivers/scsi/esas2r/esas2r_disc.c
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Diffstat (limited to 'drivers/scsi/esas2r/esas2r_disc.c')
-rw-r--r--drivers/scsi/esas2r/esas2r_disc.c1184
1 files changed, 1184 insertions, 0 deletions
diff --git a/drivers/scsi/esas2r/esas2r_disc.c b/drivers/scsi/esas2r/esas2r_disc.c
new file mode 100644
index 000000000..1c079f430
--- /dev/null
+++ b/drivers/scsi/esas2r/esas2r_disc.c
@@ -0,0 +1,1184 @@
+/*
+ * linux/drivers/scsi/esas2r/esas2r_disc.c
+ * esas2r device discovery routines
+ *
+ * Copyright (c) 2001-2013 ATTO Technology, Inc.
+ * (mailto:linuxdrivers@attotech.com)
+ */
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+/*
+ * 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; version 2 of the License.
+ *
+ * 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.
+ *
+ * NO WARRANTY
+ * THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
+ * CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
+ * LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
+ * solely responsible for determining the appropriateness of using and
+ * distributing the Program and assumes all risks associated with its
+ * exercise of rights under this Agreement, including but not limited to
+ * the risks and costs of program errors, damage to or loss of data,
+ * programs or equipment, and unavailability or interruption of operations.
+ *
+ * DISCLAIMER OF LIABILITY
+ * NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
+ * HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
+
+#include "esas2r.h"
+
+/* Miscellaneous internal discovery routines */
+static void esas2r_disc_abort(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_continue(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static void esas2r_disc_fix_curr_requests(struct esas2r_adapter *a);
+static u32 esas2r_disc_get_phys_addr(struct esas2r_sg_context *sgc, u64 *addr);
+static bool esas2r_disc_start_request(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+
+/* Internal discovery routines that process the states */
+static bool esas2r_disc_block_dev_scan(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static void esas2r_disc_block_dev_scan_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_dev_add(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_dev_remove(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_part_info(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static void esas2r_disc_part_info_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_passthru_dev_info(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static void esas2r_disc_passthru_dev_info_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_passthru_dev_addr(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static void esas2r_disc_passthru_dev_addr_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static bool esas2r_disc_raid_grp_info(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+static void esas2r_disc_raid_grp_info_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq);
+
+void esas2r_disc_initialize(struct esas2r_adapter *a)
+{
+ struct esas2r_sas_nvram *nvr = a->nvram;
+
+ esas2r_trace_enter();
+
+ clear_bit(AF_DISC_IN_PROG, &a->flags);
+ clear_bit(AF2_DEV_SCAN, &a->flags2);
+ clear_bit(AF2_DEV_CNT_OK, &a->flags2);
+
+ a->disc_start_time = jiffies_to_msecs(jiffies);
+ a->disc_wait_time = nvr->dev_wait_time * 1000;
+ a->disc_wait_cnt = nvr->dev_wait_count;
+
+ if (a->disc_wait_cnt > ESAS2R_MAX_TARGETS)
+ a->disc_wait_cnt = ESAS2R_MAX_TARGETS;
+
+ /*
+ * If we are doing chip reset or power management processing, always
+ * wait for devices. use the NVRAM device count if it is greater than
+ * previously discovered devices.
+ */
+
+ esas2r_hdebug("starting discovery...");
+
+ a->general_req.interrupt_cx = NULL;
+
+ if (test_bit(AF_CHPRST_DETECTED, &a->flags) ||
+ test_bit(AF_POWER_MGT, &a->flags)) {
+ if (a->prev_dev_cnt == 0) {
+ /* Don't bother waiting if there is nothing to wait
+ * for.
+ */
+ a->disc_wait_time = 0;
+ } else {
+ /*
+ * Set the device wait count to what was previously
+ * found. We don't care if the user only configured
+ * a time because we know the exact count to wait for.
+ * There is no need to honor the user's wishes to
+ * always wait the full time.
+ */
+ a->disc_wait_cnt = a->prev_dev_cnt;
+
+ /*
+ * bump the minimum wait time to 15 seconds since the
+ * default is 3 (system boot or the boot driver usually
+ * buys us more time).
+ */
+ if (a->disc_wait_time < 15000)
+ a->disc_wait_time = 15000;
+ }
+ }
+
+ esas2r_trace("disc wait count: %d", a->disc_wait_cnt);
+ esas2r_trace("disc wait time: %d", a->disc_wait_time);
+
+ if (a->disc_wait_time == 0)
+ esas2r_disc_check_complete(a);
+
+ esas2r_trace_exit();
+}
+
+void esas2r_disc_start_waiting(struct esas2r_adapter *a)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&a->mem_lock, flags);
+
+ if (a->disc_ctx.disc_evt)
+ esas2r_disc_start_port(a);
+
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+}
+
+void esas2r_disc_check_for_work(struct esas2r_adapter *a)
+{
+ struct esas2r_request *rq = &a->general_req;
+
+ /* service any pending interrupts first */
+
+ esas2r_polled_interrupt(a);
+
+ /*
+ * now, interrupt processing may have queued up a discovery event. go
+ * see if we have one to start. we couldn't start it in the ISR since
+ * polled discovery would cause a deadlock.
+ */
+
+ esas2r_disc_start_waiting(a);
+
+ if (rq->interrupt_cx == NULL)
+ return;
+
+ if (rq->req_stat == RS_STARTED
+ && rq->timeout <= RQ_MAX_TIMEOUT) {
+ /* wait for the current discovery request to complete. */
+ esas2r_wait_request(a, rq);
+
+ if (rq->req_stat == RS_TIMEOUT) {
+ esas2r_disc_abort(a, rq);
+ esas2r_local_reset_adapter(a);
+ return;
+ }
+ }
+
+ if (rq->req_stat == RS_PENDING
+ || rq->req_stat == RS_STARTED)
+ return;
+
+ esas2r_disc_continue(a, rq);
+}
+
+void esas2r_disc_check_complete(struct esas2r_adapter *a)
+{
+ unsigned long flags;
+
+ esas2r_trace_enter();
+
+ /* check to see if we should be waiting for devices */
+ if (a->disc_wait_time) {
+ u32 currtime = jiffies_to_msecs(jiffies);
+ u32 time = currtime - a->disc_start_time;
+
+ /*
+ * Wait until the device wait time is exhausted or the device
+ * wait count is satisfied.
+ */
+ if (time < a->disc_wait_time
+ && (esas2r_targ_db_get_tgt_cnt(a) < a->disc_wait_cnt
+ || a->disc_wait_cnt == 0)) {
+ /* After three seconds of waiting, schedule a scan. */
+ if (time >= 3000
+ && !test_and_set_bit(AF2_DEV_SCAN, &a->flags2)) {
+ spin_lock_irqsave(&a->mem_lock, flags);
+ esas2r_disc_queue_event(a, DCDE_DEV_SCAN);
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+ }
+
+ esas2r_trace_exit();
+ return;
+ }
+
+ /*
+ * We are done waiting...we think. Adjust the wait time to
+ * consume events after the count is met.
+ */
+ if (!test_and_set_bit(AF2_DEV_CNT_OK, &a->flags2))
+ a->disc_wait_time = time + 3000;
+
+ /* If we haven't done a full scan yet, do it now. */
+ if (!test_and_set_bit(AF2_DEV_SCAN, &a->flags2)) {
+ spin_lock_irqsave(&a->mem_lock, flags);
+ esas2r_disc_queue_event(a, DCDE_DEV_SCAN);
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+ esas2r_trace_exit();
+ return;
+ }
+
+ /*
+ * Now, if there is still time left to consume events, continue
+ * waiting.
+ */
+ if (time < a->disc_wait_time) {
+ esas2r_trace_exit();
+ return;
+ }
+ } else {
+ if (!test_and_set_bit(AF2_DEV_SCAN, &a->flags2)) {
+ spin_lock_irqsave(&a->mem_lock, flags);
+ esas2r_disc_queue_event(a, DCDE_DEV_SCAN);
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+ }
+ }
+
+ /* We want to stop waiting for devices. */
+ a->disc_wait_time = 0;
+
+ if (test_bit(AF_DISC_POLLED, &a->flags) &&
+ test_bit(AF_DISC_IN_PROG, &a->flags)) {
+ /*
+ * Polled discovery is still pending so continue the active
+ * discovery until it is done. At that point, we will stop
+ * polled discovery and transition to interrupt driven
+ * discovery.
+ */
+ } else {
+ /*
+ * Done waiting for devices. Note that we get here immediately
+ * after deferred waiting completes because that is interrupt
+ * driven; i.e. There is no transition.
+ */
+ esas2r_disc_fix_curr_requests(a);
+ clear_bit(AF_DISC_PENDING, &a->flags);
+
+ /*
+ * We have deferred target state changes until now because we
+ * don't want to report any removals (due to the first arrival)
+ * until the device wait time expires.
+ */
+ set_bit(AF_PORT_CHANGE, &a->flags);
+ }
+
+ esas2r_trace_exit();
+}
+
+void esas2r_disc_queue_event(struct esas2r_adapter *a, u8 disc_evt)
+{
+ struct esas2r_disc_context *dc = &a->disc_ctx;
+
+ esas2r_trace_enter();
+
+ esas2r_trace("disc_event: %d", disc_evt);
+
+ /* Initialize the discovery context */
+ dc->disc_evt |= disc_evt;
+
+ /*
+ * Don't start discovery before or during polled discovery. if we did,
+ * we would have a deadlock if we are in the ISR already.
+ */
+ if (!test_bit(AF_CHPRST_PENDING, &a->flags) &&
+ !test_bit(AF_DISC_POLLED, &a->flags))
+ esas2r_disc_start_port(a);
+
+ esas2r_trace_exit();
+}
+
+bool esas2r_disc_start_port(struct esas2r_adapter *a)
+{
+ struct esas2r_request *rq = &a->general_req;
+ struct esas2r_disc_context *dc = &a->disc_ctx;
+ bool ret;
+
+ esas2r_trace_enter();
+
+ if (test_bit(AF_DISC_IN_PROG, &a->flags)) {
+ esas2r_trace_exit();
+
+ return false;
+ }
+
+ /* If there is a discovery waiting, process it. */
+ if (dc->disc_evt) {
+ if (test_bit(AF_DISC_POLLED, &a->flags)
+ && a->disc_wait_time == 0) {
+ /*
+ * We are doing polled discovery, but we no longer want
+ * to wait for devices. Stop polled discovery and
+ * transition to interrupt driven discovery.
+ */
+
+ esas2r_trace_exit();
+
+ return false;
+ }
+ } else {
+ /* Discovery is complete. */
+
+ esas2r_hdebug("disc done");
+
+ set_bit(AF_PORT_CHANGE, &a->flags);
+
+ esas2r_trace_exit();
+
+ return false;
+ }
+
+ /* Handle the discovery context */
+ esas2r_trace("disc_evt: %d", dc->disc_evt);
+ set_bit(AF_DISC_IN_PROG, &a->flags);
+ dc->flags = 0;
+
+ if (test_bit(AF_DISC_POLLED, &a->flags))
+ dc->flags |= DCF_POLLED;
+
+ rq->interrupt_cx = dc;
+ rq->req_stat = RS_SUCCESS;
+
+ /* Decode the event code */
+ if (dc->disc_evt & DCDE_DEV_SCAN) {
+ dc->disc_evt &= ~DCDE_DEV_SCAN;
+
+ dc->flags |= DCF_DEV_SCAN;
+ dc->state = DCS_BLOCK_DEV_SCAN;
+ } else if (dc->disc_evt & DCDE_DEV_CHANGE) {
+ dc->disc_evt &= ~DCDE_DEV_CHANGE;
+
+ dc->flags |= DCF_DEV_CHANGE;
+ dc->state = DCS_DEV_RMV;
+ }
+
+ /* Continue interrupt driven discovery */
+ if (!test_bit(AF_DISC_POLLED, &a->flags))
+ ret = esas2r_disc_continue(a, rq);
+ else
+ ret = true;
+
+ esas2r_trace_exit();
+
+ return ret;
+}
+
+static bool esas2r_disc_continue(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ bool rslt;
+
+ /* Device discovery/removal */
+ while (dc->flags & (DCF_DEV_CHANGE | DCF_DEV_SCAN)) {
+ rslt = false;
+
+ switch (dc->state) {
+ case DCS_DEV_RMV:
+
+ rslt = esas2r_disc_dev_remove(a, rq);
+ break;
+
+ case DCS_DEV_ADD:
+
+ rslt = esas2r_disc_dev_add(a, rq);
+ break;
+
+ case DCS_BLOCK_DEV_SCAN:
+
+ rslt = esas2r_disc_block_dev_scan(a, rq);
+ break;
+
+ case DCS_RAID_GRP_INFO:
+
+ rslt = esas2r_disc_raid_grp_info(a, rq);
+ break;
+
+ case DCS_PART_INFO:
+
+ rslt = esas2r_disc_part_info(a, rq);
+ break;
+
+ case DCS_PT_DEV_INFO:
+
+ rslt = esas2r_disc_passthru_dev_info(a, rq);
+ break;
+ case DCS_PT_DEV_ADDR:
+
+ rslt = esas2r_disc_passthru_dev_addr(a, rq);
+ break;
+ case DCS_DISC_DONE:
+
+ dc->flags &= ~(DCF_DEV_CHANGE | DCF_DEV_SCAN);
+ break;
+
+ default:
+
+ esas2r_bugon();
+ dc->state = DCS_DISC_DONE;
+ break;
+ }
+
+ if (rslt)
+ return true;
+ }
+
+ /* Discovery is done...for now. */
+ rq->interrupt_cx = NULL;
+
+ if (!test_bit(AF_DISC_PENDING, &a->flags))
+ esas2r_disc_fix_curr_requests(a);
+
+ clear_bit(AF_DISC_IN_PROG, &a->flags);
+
+ /* Start the next discovery. */
+ return esas2r_disc_start_port(a);
+}
+
+static bool esas2r_disc_start_request(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ unsigned long flags;
+
+ /* Set the timeout to a minimum value. */
+ if (rq->timeout < ESAS2R_DEFAULT_TMO)
+ rq->timeout = ESAS2R_DEFAULT_TMO;
+
+ /*
+ * Override the request type to distinguish discovery requests. If we
+ * end up deferring the request, esas2r_disc_local_start_request()
+ * will be called to restart it.
+ */
+ rq->req_type = RT_DISC_REQ;
+
+ spin_lock_irqsave(&a->queue_lock, flags);
+
+ if (!test_bit(AF_CHPRST_PENDING, &a->flags) &&
+ !test_bit(AF_FLASHING, &a->flags))
+ esas2r_disc_local_start_request(a, rq);
+ else
+ list_add_tail(&rq->req_list, &a->defer_list);
+
+ spin_unlock_irqrestore(&a->queue_lock, flags);
+
+ return true;
+}
+
+void esas2r_disc_local_start_request(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ esas2r_trace_enter();
+
+ list_add_tail(&rq->req_list, &a->active_list);
+
+ esas2r_start_vda_request(a, rq);
+
+ esas2r_trace_exit();
+
+ return;
+}
+
+static void esas2r_disc_abort(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+
+ esas2r_trace_enter();
+
+ /* abort the current discovery */
+
+ dc->state = DCS_DISC_DONE;
+
+ esas2r_trace_exit();
+}
+
+static bool esas2r_disc_block_dev_scan(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ bool rslt;
+
+ esas2r_trace_enter();
+
+ esas2r_rq_init_request(rq, a);
+
+ esas2r_build_mgt_req(a,
+ rq,
+ VDAMGT_DEV_SCAN,
+ 0,
+ 0,
+ 0,
+ NULL);
+
+ rq->comp_cb = esas2r_disc_block_dev_scan_cb;
+
+ rq->timeout = 30000;
+ rq->interrupt_cx = dc;
+
+ rslt = esas2r_disc_start_request(a, rq);
+
+ esas2r_trace_exit();
+
+ return rslt;
+}
+
+static void esas2r_disc_block_dev_scan_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ unsigned long flags;
+
+ esas2r_trace_enter();
+
+ spin_lock_irqsave(&a->mem_lock, flags);
+
+ if (rq->req_stat == RS_SUCCESS)
+ dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation;
+
+ dc->state = DCS_RAID_GRP_INFO;
+ dc->raid_grp_ix = 0;
+
+ esas2r_rq_destroy_request(rq, a);
+
+ /* continue discovery if it's interrupt driven */
+
+ if (!(dc->flags & DCF_POLLED))
+ esas2r_disc_continue(a, rq);
+
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+
+ esas2r_trace_exit();
+}
+
+static bool esas2r_disc_raid_grp_info(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ bool rslt;
+ struct atto_vda_grp_info *grpinfo;
+
+ esas2r_trace_enter();
+
+ esas2r_trace("raid_group_idx: %d", dc->raid_grp_ix);
+
+ if (dc->raid_grp_ix >= VDA_MAX_RAID_GROUPS) {
+ dc->state = DCS_DISC_DONE;
+
+ esas2r_trace_exit();
+
+ return false;
+ }
+
+ esas2r_rq_init_request(rq, a);
+
+ grpinfo = &rq->vda_rsp_data->mgt_data.data.grp_info;
+
+ memset(grpinfo, 0, sizeof(struct atto_vda_grp_info));
+
+ esas2r_build_mgt_req(a,
+ rq,
+ VDAMGT_GRP_INFO,
+ dc->scan_gen,
+ 0,
+ sizeof(struct atto_vda_grp_info),
+ NULL);
+
+ grpinfo->grp_index = dc->raid_grp_ix;
+
+ rq->comp_cb = esas2r_disc_raid_grp_info_cb;
+
+ rq->interrupt_cx = dc;
+
+ rslt = esas2r_disc_start_request(a, rq);
+
+ esas2r_trace_exit();
+
+ return rslt;
+}
+
+static void esas2r_disc_raid_grp_info_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ unsigned long flags;
+ struct atto_vda_grp_info *grpinfo;
+
+ esas2r_trace_enter();
+
+ spin_lock_irqsave(&a->mem_lock, flags);
+
+ if (rq->req_stat == RS_SCAN_GEN) {
+ dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation;
+ dc->raid_grp_ix = 0;
+ goto done;
+ }
+
+ if (rq->req_stat == RS_SUCCESS) {
+ grpinfo = &rq->vda_rsp_data->mgt_data.data.grp_info;
+
+ if (grpinfo->status != VDA_GRP_STAT_ONLINE
+ && grpinfo->status != VDA_GRP_STAT_DEGRADED) {
+ /* go to the next group. */
+
+ dc->raid_grp_ix++;
+ } else {
+ memcpy(&dc->raid_grp_name[0],
+ &grpinfo->grp_name[0],
+ sizeof(grpinfo->grp_name));
+
+ dc->interleave = le32_to_cpu(grpinfo->interleave);
+ dc->block_size = le32_to_cpu(grpinfo->block_size);
+
+ dc->state = DCS_PART_INFO;
+ dc->part_num = 0;
+ }
+ } else {
+ if (!(rq->req_stat == RS_GRP_INVALID)) {
+ esas2r_log(ESAS2R_LOG_WARN,
+ "A request for RAID group info failed - "
+ "returned with %x",
+ rq->req_stat);
+ }
+
+ dc->dev_ix = 0;
+ dc->state = DCS_PT_DEV_INFO;
+ }
+
+done:
+
+ esas2r_rq_destroy_request(rq, a);
+
+ /* continue discovery if it's interrupt driven */
+
+ if (!(dc->flags & DCF_POLLED))
+ esas2r_disc_continue(a, rq);
+
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+
+ esas2r_trace_exit();
+}
+
+static bool esas2r_disc_part_info(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ bool rslt;
+ struct atto_vdapart_info *partinfo;
+
+ esas2r_trace_enter();
+
+ esas2r_trace("part_num: %d", dc->part_num);
+
+ if (dc->part_num >= VDA_MAX_PARTITIONS) {
+ dc->state = DCS_RAID_GRP_INFO;
+ dc->raid_grp_ix++;
+
+ esas2r_trace_exit();
+
+ return false;
+ }
+
+ esas2r_rq_init_request(rq, a);
+
+ partinfo = &rq->vda_rsp_data->mgt_data.data.part_info;
+
+ memset(partinfo, 0, sizeof(struct atto_vdapart_info));
+
+ esas2r_build_mgt_req(a,
+ rq,
+ VDAMGT_PART_INFO,
+ dc->scan_gen,
+ 0,
+ sizeof(struct atto_vdapart_info),
+ NULL);
+
+ partinfo->part_no = dc->part_num;
+
+ memcpy(&partinfo->grp_name[0],
+ &dc->raid_grp_name[0],
+ sizeof(partinfo->grp_name));
+
+ rq->comp_cb = esas2r_disc_part_info_cb;
+
+ rq->interrupt_cx = dc;
+
+ rslt = esas2r_disc_start_request(a, rq);
+
+ esas2r_trace_exit();
+
+ return rslt;
+}
+
+static void esas2r_disc_part_info_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ unsigned long flags;
+ struct atto_vdapart_info *partinfo;
+
+ esas2r_trace_enter();
+
+ spin_lock_irqsave(&a->mem_lock, flags);
+
+ if (rq->req_stat == RS_SCAN_GEN) {
+ dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation;
+ dc->raid_grp_ix = 0;
+ dc->state = DCS_RAID_GRP_INFO;
+ } else if (rq->req_stat == RS_SUCCESS) {
+ partinfo = &rq->vda_rsp_data->mgt_data.data.part_info;
+
+ dc->part_num = partinfo->part_no;
+
+ dc->curr_virt_id = le16_to_cpu(partinfo->target_id);
+
+ esas2r_targ_db_add_raid(a, dc);
+
+ dc->part_num++;
+ } else {
+ if (!(rq->req_stat == RS_PART_LAST)) {
+ esas2r_log(ESAS2R_LOG_WARN,
+ "A request for RAID group partition info "
+ "failed - status:%d", rq->req_stat);
+ }
+
+ dc->state = DCS_RAID_GRP_INFO;
+ dc->raid_grp_ix++;
+ }
+
+ esas2r_rq_destroy_request(rq, a);
+
+ /* continue discovery if it's interrupt driven */
+
+ if (!(dc->flags & DCF_POLLED))
+ esas2r_disc_continue(a, rq);
+
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+
+ esas2r_trace_exit();
+}
+
+static bool esas2r_disc_passthru_dev_info(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ bool rslt;
+ struct atto_vda_devinfo *devinfo;
+
+ esas2r_trace_enter();
+
+ esas2r_trace("dev_ix: %d", dc->dev_ix);
+
+ esas2r_rq_init_request(rq, a);
+
+ devinfo = &rq->vda_rsp_data->mgt_data.data.dev_info;
+
+ memset(devinfo, 0, sizeof(struct atto_vda_devinfo));
+
+ esas2r_build_mgt_req(a,
+ rq,
+ VDAMGT_DEV_PT_INFO,
+ dc->scan_gen,
+ dc->dev_ix,
+ sizeof(struct atto_vda_devinfo),
+ NULL);
+
+ rq->comp_cb = esas2r_disc_passthru_dev_info_cb;
+
+ rq->interrupt_cx = dc;
+
+ rslt = esas2r_disc_start_request(a, rq);
+
+ esas2r_trace_exit();
+
+ return rslt;
+}
+
+static void esas2r_disc_passthru_dev_info_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ unsigned long flags;
+ struct atto_vda_devinfo *devinfo;
+
+ esas2r_trace_enter();
+
+ spin_lock_irqsave(&a->mem_lock, flags);
+
+ if (rq->req_stat == RS_SCAN_GEN) {
+ dc->scan_gen = rq->func_rsp.mgt_rsp.scan_generation;
+ dc->dev_ix = 0;
+ dc->state = DCS_PT_DEV_INFO;
+ } else if (rq->req_stat == RS_SUCCESS) {
+ devinfo = &rq->vda_rsp_data->mgt_data.data.dev_info;
+
+ dc->dev_ix = le16_to_cpu(rq->func_rsp.mgt_rsp.dev_index);
+
+ dc->curr_virt_id = le16_to_cpu(devinfo->target_id);
+
+ if (le16_to_cpu(devinfo->features) & VDADEVFEAT_PHYS_ID) {
+ dc->curr_phys_id =
+ le16_to_cpu(devinfo->phys_target_id);
+ dc->dev_addr_type = ATTO_GDA_AT_PORT;
+ dc->state = DCS_PT_DEV_ADDR;
+
+ esas2r_trace("curr_virt_id: %d", dc->curr_virt_id);
+ esas2r_trace("curr_phys_id: %d", dc->curr_phys_id);
+ } else {
+ dc->dev_ix++;
+ }
+ } else {
+ if (!(rq->req_stat == RS_DEV_INVALID)) {
+ esas2r_log(ESAS2R_LOG_WARN,
+ "A request for device information failed - "
+ "status:%d", rq->req_stat);
+ }
+
+ dc->state = DCS_DISC_DONE;
+ }
+
+ esas2r_rq_destroy_request(rq, a);
+
+ /* continue discovery if it's interrupt driven */
+
+ if (!(dc->flags & DCF_POLLED))
+ esas2r_disc_continue(a, rq);
+
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+
+ esas2r_trace_exit();
+}
+
+static bool esas2r_disc_passthru_dev_addr(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ bool rslt;
+ struct atto_ioctl *hi;
+ struct esas2r_sg_context sgc;
+
+ esas2r_trace_enter();
+
+ esas2r_rq_init_request(rq, a);
+
+ /* format the request. */
+
+ sgc.cur_offset = NULL;
+ sgc.get_phys_addr = (PGETPHYSADDR)esas2r_disc_get_phys_addr;
+ sgc.length = offsetof(struct atto_ioctl, data)
+ + sizeof(struct atto_hba_get_device_address);
+
+ esas2r_sgc_init(&sgc, a, rq, rq->vrq->ioctl.sge);
+
+ esas2r_build_ioctl_req(a, rq, sgc.length, VDA_IOCTL_HBA);
+
+ if (!esas2r_build_sg_list(a, rq, &sgc)) {
+ esas2r_rq_destroy_request(rq, a);
+
+ esas2r_trace_exit();
+
+ return false;
+ }
+
+ rq->comp_cb = esas2r_disc_passthru_dev_addr_cb;
+
+ rq->interrupt_cx = dc;
+
+ /* format the IOCTL data. */
+
+ hi = (struct atto_ioctl *)a->disc_buffer;
+
+ memset(a->disc_buffer, 0, ESAS2R_DISC_BUF_LEN);
+
+ hi->version = ATTO_VER_GET_DEV_ADDR0;
+ hi->function = ATTO_FUNC_GET_DEV_ADDR;
+ hi->flags = HBAF_TUNNEL;
+
+ hi->data.get_dev_addr.target_id = le32_to_cpu(dc->curr_phys_id);
+ hi->data.get_dev_addr.addr_type = dc->dev_addr_type;
+
+ /* start it up. */
+
+ rslt = esas2r_disc_start_request(a, rq);
+
+ esas2r_trace_exit();
+
+ return rslt;
+}
+
+static void esas2r_disc_passthru_dev_addr_cb(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ struct esas2r_target *t = NULL;
+ unsigned long flags;
+ struct atto_ioctl *hi;
+ u16 addrlen;
+
+ esas2r_trace_enter();
+
+ spin_lock_irqsave(&a->mem_lock, flags);
+
+ hi = (struct atto_ioctl *)a->disc_buffer;
+
+ if (rq->req_stat == RS_SUCCESS
+ && hi->status == ATTO_STS_SUCCESS) {
+ addrlen = le16_to_cpu(hi->data.get_dev_addr.addr_len);
+
+ if (dc->dev_addr_type == ATTO_GDA_AT_PORT) {
+ if (addrlen == sizeof(u64))
+ memcpy(&dc->sas_addr,
+ &hi->data.get_dev_addr.address[0],
+ addrlen);
+ else
+ memset(&dc->sas_addr, 0, sizeof(dc->sas_addr));
+
+ /* Get the unique identifier. */
+ dc->dev_addr_type = ATTO_GDA_AT_UNIQUE;
+
+ goto next_dev_addr;
+ } else {
+ /* Add the pass through target. */
+ if (HIBYTE(addrlen) == 0) {
+ t = esas2r_targ_db_add_pthru(a,
+ dc,
+ &hi->data.
+ get_dev_addr.
+ address[0],
+ (u8)hi->data.
+ get_dev_addr.
+ addr_len);
+
+ if (t)
+ memcpy(&t->sas_addr, &dc->sas_addr,
+ sizeof(t->sas_addr));
+ } else {
+ /* getting the back end data failed */
+
+ esas2r_log(ESAS2R_LOG_WARN,
+ "an error occurred retrieving the "
+ "back end data (%s:%d)",
+ __func__,
+ __LINE__);
+ }
+ }
+ } else {
+ /* getting the back end data failed */
+
+ esas2r_log(ESAS2R_LOG_WARN,
+ "an error occurred retrieving the back end data - "
+ "rq->req_stat:%d hi->status:%d",
+ rq->req_stat, hi->status);
+ }
+
+ /* proceed to the next device. */
+
+ if (dc->flags & DCF_DEV_SCAN) {
+ dc->dev_ix++;
+ dc->state = DCS_PT_DEV_INFO;
+ } else if (dc->flags & DCF_DEV_CHANGE) {
+ dc->curr_targ++;
+ dc->state = DCS_DEV_ADD;
+ } else {
+ esas2r_bugon();
+ }
+
+next_dev_addr:
+ esas2r_rq_destroy_request(rq, a);
+
+ /* continue discovery if it's interrupt driven */
+
+ if (!(dc->flags & DCF_POLLED))
+ esas2r_disc_continue(a, rq);
+
+ spin_unlock_irqrestore(&a->mem_lock, flags);
+
+ esas2r_trace_exit();
+}
+
+static u32 esas2r_disc_get_phys_addr(struct esas2r_sg_context *sgc, u64 *addr)
+{
+ struct esas2r_adapter *a = sgc->adapter;
+
+ if (sgc->length > ESAS2R_DISC_BUF_LEN)
+ esas2r_bugon();
+
+ *addr = a->uncached_phys
+ + (u64)((u8 *)a->disc_buffer - a->uncached);
+
+ return sgc->length;
+}
+
+static bool esas2r_disc_dev_remove(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ struct esas2r_target *t;
+ struct esas2r_target *t2;
+
+ esas2r_trace_enter();
+
+ /* process removals. */
+
+ for (t = a->targetdb; t < a->targetdb_end; t++) {
+ if (t->new_target_state != TS_NOT_PRESENT)
+ continue;
+
+ t->new_target_state = TS_INVALID;
+
+ /* remove the right target! */
+
+ t2 =
+ esas2r_targ_db_find_by_virt_id(a,
+ esas2r_targ_get_id(t,
+ a));
+
+ if (t2)
+ esas2r_targ_db_remove(a, t2);
+ }
+
+ /* removals complete. process arrivals. */
+
+ dc->state = DCS_DEV_ADD;
+ dc->curr_targ = a->targetdb;
+
+ esas2r_trace_exit();
+
+ return false;
+}
+
+static bool esas2r_disc_dev_add(struct esas2r_adapter *a,
+ struct esas2r_request *rq)
+{
+ struct esas2r_disc_context *dc =
+ (struct esas2r_disc_context *)rq->interrupt_cx;
+ struct esas2r_target *t = dc->curr_targ;
+
+ if (t >= a->targetdb_end) {
+ /* done processing state changes. */
+
+ dc->state = DCS_DISC_DONE;
+ } else if (t->new_target_state == TS_PRESENT) {
+ struct atto_vda_ae_lu *luevt = &t->lu_event;
+
+ esas2r_trace_enter();
+
+ /* clear this now in case more events come in. */
+
+ t->new_target_state = TS_INVALID;
+
+ /* setup the discovery context for adding this device. */
+
+ dc->curr_virt_id = esas2r_targ_get_id(t, a);
+
+ if ((luevt->hdr.bylength >= offsetof(struct atto_vda_ae_lu, id)
+ + sizeof(struct atto_vda_ae_lu_tgt_lun_raid))
+ && !(luevt->dwevent & VDAAE_LU_PASSTHROUGH)) {
+ dc->block_size = luevt->id.tgtlun_raid.dwblock_size;
+ dc->interleave = luevt->id.tgtlun_raid.dwinterleave;
+ } else {
+ dc->block_size = 0;
+ dc->interleave = 0;
+ }
+
+ /* determine the device type being added. */
+
+ if (luevt->dwevent & VDAAE_LU_PASSTHROUGH) {
+ if (luevt->dwevent & VDAAE_LU_PHYS_ID) {
+ dc->state = DCS_PT_DEV_ADDR;
+ dc->dev_addr_type = ATTO_GDA_AT_PORT;
+ dc->curr_phys_id = luevt->wphys_target_id;
+ } else {
+ esas2r_log(ESAS2R_LOG_WARN,
+ "luevt->dwevent does not have the "
+ "VDAAE_LU_PHYS_ID bit set (%s:%d)",
+ __func__, __LINE__);
+ }
+ } else {
+ dc->raid_grp_name[0] = 0;
+
+ esas2r_targ_db_add_raid(a, dc);
+ }
+
+ esas2r_trace("curr_virt_id: %d", dc->curr_virt_id);
+ esas2r_trace("curr_phys_id: %d", dc->curr_phys_id);
+ esas2r_trace("dwevent: %d", luevt->dwevent);
+
+ esas2r_trace_exit();
+ }
+
+ if (dc->state == DCS_DEV_ADD) {
+ /* go to the next device. */
+
+ dc->curr_targ++;
+ }
+
+ return false;
+}
+
+/*
+ * When discovery is done, find all requests on defer queue and
+ * test if they need to be modified. If a target is no longer present
+ * then complete the request with RS_SEL. Otherwise, update the
+ * target_id since after a hibernate it can be a different value.
+ * VDA does not make passthrough target IDs persistent.
+ */
+static void esas2r_disc_fix_curr_requests(struct esas2r_adapter *a)
+{
+ unsigned long flags;
+ struct esas2r_target *t;
+ struct esas2r_request *rq;
+ struct list_head *element;
+
+ /* update virt_targ_id in any outstanding esas2r_requests */
+
+ spin_lock_irqsave(&a->queue_lock, flags);
+
+ list_for_each(element, &a->defer_list) {
+ rq = list_entry(element, struct esas2r_request, req_list);
+ if (rq->vrq->scsi.function == VDA_FUNC_SCSI) {
+ t = a->targetdb + rq->target_id;
+
+ if (t->target_state == TS_PRESENT)
+ rq->vrq->scsi.target_id = le16_to_cpu(
+ t->virt_targ_id);
+ else
+ rq->req_stat = RS_SEL;
+ }
+
+ }
+
+ spin_unlock_irqrestore(&a->queue_lock, flags);
+}