isci: kill smp_discover_response

An lldd need never look at the contents of an smp_discover_response frame.
Kill the remaining locations where isci is looking at it:

1/ covering for expanders that do not set the stp_attached bit (already
   handled by sas_ex_discover_end_dev)
2/ an overkill method to notifiy the rest of the driver about remote_device
   sas addresses

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

4 files changed, 23 insertions, 337 deletions

diff --git a/drivers/scsi/isci/core/intel_sas.h b/drivers/scsi/isci/core/intel_sas.h
index d9c9f33a7af5..b57f39c2cfc2 100644
--- a/drivers/scsi/isci/core/intel_sas.h
+++ b/drivers/scsi/isci/core/intel_sas.h
@@ -628,202 +628,6 @@ struct smp_response_report_manufacturer_information {
 
 };
 
-#define SMP_RESPONSE_DISCOVER_FORMAT_1_1_SIZE 52
-#define SMP_RESPONSE_DISCOVER_FORMAT_2_SIZE   116
-
-/**
- * struct smp_discover_response_protocols - This structure depicts the discover
- *    response where the supported protocols by the remote phy are specified.
- *
- * For specific information on each of these individual fields please reference
- * the SAS specification Link layer section on address frames.
- */
-struct smp_discover_response_protocols {
-        union {
-                struct {
-                        u16 attached_sata_host:1;
-                        u16 attached_smp_initiator:1;
-                        u16 attached_stp_initiator:1;
-                        u16 attached_ssp_initiator:1;
-                        u16 reserved3:4;
-                        u16 attached_sata_device:1;
-                        u16 attached_smp_target:1;
-                        u16 attached_stp_target:1;
-                        u16 attached_ssp_target:1;
-                        u16 reserved4:3;
-                        u16 attached_sata_port_selector:1;
-                } bits;
-
-                u16 all;
-        } u;
-
-};
-
-/**
- * struct SMP_RESPONSE_DISCOVER_FORMAT - This structure defines the SMP phy
- *    discover response format. It handles both SAS1.1 and SAS 2 definitions.
- *    The unions indicate locations where the SAS specification versions differ
- *    from one another.
- *
- *
- */
-struct smp_response_discover {
-
-        union {
-                struct {
-                        u8 reserved[2];
-                } sas1_1;
-
-                struct {
-                        u16 expander_change_count;
-                } sas2;
-
-        } u1;
-
-        u8 reserved1[3];
-        u8 phy_identifier;
-        u8 reserved2[2];
-
-        union {
-                struct {
-                        u16 reserved1:4;
-                        u16 attached_device_type:3;
-                        u16 reserved2:1;
-                        u16 negotiated_physical_link_rate:4;
-                        u16 reserved3:4;
-                } sas1_1;
-
-                struct {
-                        u16 attached_reason:4;
-                        u16 attached_device_type:3;
-                        u16 reserved2:1;
-                        u16 negotiated_logical_link_rate:4;
-                        u16 reserved3:4;
-                } sas2;
-
-        } u2;
-
-        struct smp_discover_response_protocols protocols;
-        struct sci_sas_address sas_address;
-        struct sci_sas_address attached_sas_address;
-
-        u8 attached_phy_identifier;
-
-        union {
-                struct {
-                        u8 reserved;
-                } sas1_1;
-
-                struct {
-                        u8 attached_break_reply_capable:1;
-                        u8 attached_requested_inside_zpsds:1;
-                        u8 attached_inside_zpsds_persistent:1;
-                        u8 reserved1:5;
-                } sas2;
-
-        } u3;
-
-        u8 reserved_for_identify[6];
-
-        u32 hardware_min_physical_link_rate:4;
-        u32 programmed_min_physical_link_rate:4;
-        u32 hardware_max_physical_link_rate:4;
-        u32 programmed_max_physical_link_rate:4;
-        u32 phy_change_count:8;
-        u32 partial_pathway_timeout_value:4;
-        u32 reserved5:3;
-        u32 virtual_phy:1;
-
-        u32 routing_attribute:4;
-        u32 reserved6:4;
-        u32 connector_type:7;
-        u32 reserved7:1;
-        u32 connector_element_index:8;
-        u32 connector_physical_link:8;
-
-        u16 reserved8;
-        u16 vendor_specific;
-
-        union {
-                struct {
-                        /**
-                         * In the SAS 1.1 specification this structure ends after 52 bytes.
-                         * As a result, the contents of this field should never have a
-                         * real value.  It is undefined.
-                         */
-                        u8 undefined[SMP_RESPONSE_DISCOVER_FORMAT_2_SIZE
-                                     - SMP_RESPONSE_DISCOVER_FORMAT_1_1_SIZE];
-                } sas1_1;
-
-                struct {
-                        struct sci_sas_address attached_device_name;
-
-                        u32 zoning_enabled:1;
-                        u32 inside_zpsds:1;
-                        u32 zone_group_persistent:1;
-                        u32 reserved1:1;
-                        u32 requested_inside_zpsds:1;
-                        u32 inside_zpsds_persistent:1;
-                        u32 requested_inside_zpsds_changed_by_expander:1;
-                        u32 reserved2:1;
-                        u32 reserved_for_zoning_fields:16;
-                        u32 zone_group:8;
-
-                        u8 self_configuration_status;
-                        u8 self_configuration_levels_completed;
-                        u16 reserved_for_self_config_fields;
-
-                        struct sci_sas_address self_configuration_sas_address;
-
-                        u32 programmed_phy_capabilities;
-                        u32 current_phy_capabilities;
-                        u32 attached_phy_capabilities;
-
-                        u32 reserved3;
-
-                        u32 reserved4:16;
-                        u32 negotiated_physical_link_rate:4;
-                        u32 reason:4;
-                        u32 hardware_muxing_supported:1;
-                        u32 negotiated_ssc:1;
-                        u32 reserved5:6;
-
-                        u32 default_zoning_enabled:1;
-                        u32 reserved6:1;
-                        u32 default_zone_group_persistent:1;
-                        u32 reserved7:1;
-                        u32 default_requested_inside_zpsds:1;
-                        u32 default_inside_zpsds_persistent:1;
-                        u32 reserved8:2;
-                        u32 reserved9:16;
-                        u32 default_zone_group:8;
-
-                        u32 saved_zoning_enabled:1;
-                        u32 reserved10:1;
-                        u32 saved_zone_group_persistent:1;
-                        u32 reserved11:1;
-                        u32 saved_requested_inside_zpsds:1;
-                        u32 saved_inside_zpsds_persistent:1;
-                        u32 reserved12:18;
-                        u32 saved_zone_group:8;
-
-                        u32 reserved14:2;
-                        u32 shadow_zone_group_persistent:1;
-                        u32 reserved15:1;
-                        u32 shadow_requested_inside_zpsds:1;
-                        u32 shadow_inside_zpsds_persistent:1;
-                        u32 reserved16:18;
-                        u32 shadow_zone_group:8;
-
-                        u8 device_slot_number;
-                        u8 device_slot_group_number;
-                        u8 device_slot_group_output_connector[6];
-                } sas2;
-
-        } u4;
-
-};
-
 /**
  * struct smp_response_report_phy_sata - This structure depicts the contents of
  *    the SAS SMP REPORT PHY SATA frame.  For specific information on each of
@@ -857,7 +661,6 @@ struct smp_response_vendor_specific {
 union smp_response_body {
         struct smp_response_report_general report_general;
         struct smp_response_report_manufacturer_information report_manufacturer_information;
-        struct smp_response_discover discover;
         struct smp_response_report_phy_sata report_phy_sata;
         struct smp_response_vendor_specific vendor_specific_response;
 };
diff --git a/drivers/scsi/isci/core/scic_sds_smp_request.c b/drivers/scsi/isci/core/scic_sds_smp_request.c
index 1790f25758d1..d4009e57acaf 100644
--- a/drivers/scsi/isci/core/scic_sds_smp_request.c
+++ b/drivers/scsi/isci/core/scic_sds_smp_request.c
@@ -339,26 +339,6 @@ static enum sci_status scic_sds_smp_request_await_response_frame_handler(
                         smp_response_buffer,
                         sizeof(union smp_response_body) / sizeof(u32)
                         );
-                if (rsp_hdr->function == SMP_FUNCTION_DISCOVER) {
-                        struct smp_response *smp_resp;
-
-                        smp_resp = (struct smp_response *)user_smp_buffer;
-
-                        /*
-                         * Some expanders only report an attached SATA device, and
-                         * not an STP target.  Since the core depends on the STP
-                         * target attribute to correctly build I/O, set the bit now
-                         * if necessary. */
-                        if (smp_resp->response.discover.protocols.u.bits.attached_sata_device
-                            && !smp_resp->response.discover.protocols.u.bits.attached_stp_target) {
-                                smp_resp->response.discover.protocols.u.bits.attached_stp_target = 1;
-
-                                dev_dbg(scic_to_dev(sci_req->owning_controller),
-                                        "%s: scic_sds_smp_request_await_response_frame_handler(0x%p) Found SATA dev, setting STP bit.\n",
-                                        __func__, sci_req);
-                        }
-                }
-
                 /*
                  * Don't need to copy to user space. User instead will refer to
                  * core request's response buffer. */
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
index fc79a5b47f72..5ba3b5dca4d5 100644
--- a/drivers/scsi/isci/remote_device.c
+++ b/drivers/scsi/isci/remote_device.c
@@ -1533,21 +1533,8 @@ static enum sci_status scic_remote_device_da_construct(struct scic_sds_port *sci
         return SCI_SUCCESS;
 }
 
-static void scic_sds_remote_device_get_info_from_smp_discover_response(
-        struct scic_sds_remote_device *sci_dev,
-        struct smp_response_discover *discover_response)
-{
-        /* decode discover_response to set sas_address to sci_dev. */
-        sci_dev->device_address.high =
-                discover_response->attached_sas_address.high;
-
-        sci_dev->device_address.low =
-                discover_response->attached_sas_address.low;
-}
-
 /**
  * scic_remote_device_ea_construct() - construct expander attached device
- * @discover_response: data to build remote device
  *
  * Remote node context(s) is/are a global resource allocated by this
  * routine, freed by scic_remote_device_destruct().
@@ -1559,17 +1546,14 @@ static void scic_sds_remote_device_get_info_from_smp_discover_response(
  * SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
  */
 static enum sci_status scic_remote_device_ea_construct(struct scic_sds_port *sci_port,
-                                                       struct scic_sds_remote_device *sci_dev,
-                                                       struct smp_response_discover *discover_response)
+                                                       struct scic_sds_remote_device *sci_dev)
 {
         struct scic_sds_controller *scic = sci_port->owning_controller;
         struct domain_device *dev = sci_dev_to_domain(sci_dev);
         enum sci_status status;
 
         scic_remote_device_construct(sci_port, sci_dev);
-
-        scic_sds_remote_device_get_info_from_smp_discover_response(
-                sci_dev, discover_response);
+        memcpy(&sci_dev->device_address, dev->sas_addr, SAS_ADDR_SIZE);
 
         status = scic_sds_controller_allocate_remote_node_context(
                 scic, sci_dev, &sci_dev->rnc.remote_node_index);
@@ -1605,7 +1589,7 @@ static enum sci_status scic_remote_device_ea_construct(struct scic_sds_port *sci
          * physical.  Furthermore, the SAS-2 and SAS-1.1 fields overlay
          * one another, so this code works for both situations. */
         sci_dev->connection_rate = min_t(u16, scic_sds_port_get_max_allowed_speed(sci_port),
-                        discover_response->u2.sas1_1.negotiated_physical_link_rate);
+                                         dev->linkrate);
 
         /* / @todo Should I assign the port width by reading all of the phys on the port? */
         sci_dev->device_port_width = 1;
@@ -1632,117 +1616,35 @@ static enum sci_status scic_remote_device_start(struct scic_sds_remote_device *s
         return sci_dev->state_handlers->start_handler(sci_dev);
 }
 
-/**
- * isci_remote_device_construct() - This function calls the scic remote device
- *    construct and start functions, it waits on the remote device start
- *    completion.
- * @port: This parameter specifies the isci port with the remote device.
- * @isci_device: This parameter specifies the isci remote device
- *
- * status from the scic calls, the caller to this function should clean up
- * resources as appropriate.
- */
-static enum sci_status isci_remote_device_construct(
-        struct isci_port *port,
-        struct isci_remote_device *isci_device)
+static enum sci_status isci_remote_device_construct(struct isci_port *iport,
+                                                    struct isci_remote_device *idev)
 {
-        enum sci_status status = SCI_SUCCESS;
-
-        if (isci_device->domain_dev->parent &&
-            dev_is_expander(isci_device->domain_dev->parent)) {
-                int i;
-
-                /* struct smp_response_discover discover_response; */
-                struct discover_resp discover_response;
-                struct domain_device *parent =
-                        isci_device->domain_dev->parent;
-
-                struct expander_device *parent_ex = &parent->ex_dev;
-
-                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(isci_device->domain_dev->sas_addr)) {
-
-                                discover_response.attached_dev_type
-                                        = phy->attached_dev_type;
-                                discover_response.linkrate
-                                        = phy->linkrate;
-                                discover_response.attached_sata_host
-                                        = phy->attached_sata_host;
-                                discover_response.attached_sata_dev
-                                        = phy->attached_sata_dev;
-                                discover_response.attached_sata_ps
-                                        = phy->attached_sata_ps;
-                                discover_response.iproto
-                                        = phy->attached_iproto >> 1;
-                                discover_response.tproto
-                                        = phy->attached_tproto >> 1;
-                                memcpy(
-                                        discover_response.attached_sas_addr,
-                                        phy->attached_sas_addr,
-                                        SAS_ADDR_SIZE
-                                        );
-                                discover_response.attached_phy_id
-                                        = phy->attached_phy_id;
-                                discover_response.change_count
-                                        = phy->phy_change_count;
-                                discover_response.routing_attr
-                                        = phy->routing_attr;
-                                discover_response.hmin_linkrate
-                                        = phy->phy->minimum_linkrate_hw;
-                                discover_response.hmax_linkrate
-                                        = phy->phy->maximum_linkrate_hw;
-                                discover_response.pmin_linkrate
-                                        = phy->phy->minimum_linkrate;
-                                discover_response.pmax_linkrate
-                                        = phy->phy->maximum_linkrate;
-                        }
-                }
-
-
-                dev_dbg(&port->isci_host->pdev->dev,
-                        "%s: parent->dev_type = EDGE_DEV\n",
-                        __func__);
-
-                status = scic_remote_device_ea_construct(port->sci_port_handle,
-                                                         &isci_device->sci,
-                                (struct smp_response_discover *)&discover_response);
-
-        } else
-                status = scic_remote_device_da_construct(port->sci_port_handle,
-                                                         &isci_device->sci);
+        struct scic_sds_port *sci_port = iport->sci_port_handle;
+        struct isci_host *ihost = iport->isci_host;
+        struct domain_device *dev = idev->domain_dev;
+        enum sci_status status;
 
+        if (dev->parent && dev_is_expander(dev->parent))
+                status = scic_remote_device_ea_construct(sci_port, &idev->sci);
+        else
+                status = scic_remote_device_da_construct(sci_port, &idev->sci);
 
         if (status != SCI_SUCCESS) {
-                dev_dbg(&port->isci_host->pdev->dev,
-                        "%s: scic_remote_device_da_construct failed - "
-                        "isci_device = %p\n",
-                        __func__,
-                        isci_device);
+                dev_dbg(&ihost->pdev->dev, "%s: construct failed: %d\n",
+                        __func__, status);
 
                 return status;
         }
 
         /* XXX will be killed with sci_base_object removal */
-        sci_object_set_association(&isci_device->sci, isci_device);
+        sci_object_set_association(&idev->sci, idev);
 
         /* start the device. */
-        status = scic_remote_device_start(&isci_device->sci,
-                                          ISCI_REMOTE_DEVICE_START_TIMEOUT);
+        status = scic_remote_device_start(&idev->sci, ISCI_REMOTE_DEVICE_START_TIMEOUT);
 
-        if (status != SCI_SUCCESS) {
-                dev_warn(&port->isci_host->pdev->dev,
-                         "%s: scic_remote_device_start failed\n",
-                         __func__);
-                return status;
-        }
+        if (status != SCI_SUCCESS)
+                dev_warn(&ihost->pdev->dev, "remote device start failed: %d\n",
+                         status);
 
         return status;
 }
diff --git a/drivers/scsi/isci/remote_node_context.c b/drivers/scsi/isci/remote_node_context.c
index 285232fd5e63..59f878f11f33 100644
--- a/drivers/scsi/isci/remote_node_context.c
+++ b/drivers/scsi/isci/remote_node_context.c
@@ -124,8 +124,9 @@ static void scic_sds_remote_node_context_construct_buffer(
         rnc->ssp.logical_port_index =
                 scic_sds_remote_device_get_port_index(sci_dev);
 
-        rnc->ssp.remote_sas_address_hi = SCIC_SWAP_DWORD(sci_dev->device_address.high);
-        rnc->ssp.remote_sas_address_lo = SCIC_SWAP_DWORD(sci_dev->device_address.low);
+        /* address is always big endian, destination is always little */
+        rnc->ssp.remote_sas_address_hi = swab32(sci_dev->device_address.high);
+        rnc->ssp.remote_sas_address_lo = swab32(sci_dev->device_address.low);
 
         rnc->ssp.nexus_loss_timer_enable = true;
         rnc->ssp.check_bit               = false;