scsi: mpt3sas: Handle vSES vphy object during HBA reset

During HBA reset the Port ID of vSES device may change. As a result, it is
necessary to refresh virtual_phy objects after reset.

Each Port's vphy_list table needs to be updated after updating the
HBA port table. The algorithm is as follows:

 - Loop over each port entry from HBA port table
   * Loop over each virtual phy entry from port's vphys_list table
     - Mark virtual phy entry as dirty by setting dirty bit in virtual phy
       entry's flags field
 - Read SASIOUnitPage0 page
 - Loop over each HBA Phy's Phy data from SASIOUnitPage0
    * If phy's remote attached device is not SES device then continue with
      processing next HBA Phy's Phy data;
    * Read SASPhyPage0 data for this Phy number and determine whether
      current phy is a virtual phy or not. If it is not a virtual phy then
      continue with next Phy data;
    * Get the current phy's remote attached vSES device's SAS Address;
    * Loop over each port entry from HBA port table
      - If Port's vphys_mask field is zero then continue with
        next Port entry,
      - Loop over each virtual phy entry from Port's vphy_list table
      - If the current phy's remote SAS Address is different from
        virtual phy entry's SAS Address then continue with next
        virtual phy entry,
      - Set bit corresponding to current phy number in virtual phy
        entry's phy_mask field,
      - Get the HBA port table's Port entry corresponding to
        Phy data's 'Port' value,
        * If there is no Port entry corresponding to Phy data's
	 'Port' value in HBA port table then create a new port entry
	 and add it to HBA port table.
      - If this retrieved Port entry is the same as the current Port
        entry then don't do anything, just clear the dirty bit from
        virtual phy entry's flag field and continue with processing
        next HBA Phy's Phy data.
      - If this retrieved Port entry is different from the current Port
        entry then move the current virtual phy entry from current Port's
        vphys_list to retrieved Port entry's vphys_list.
        * Clear current phy bit in current Port entry's vphys_mask and
          set the current phy bit in the retrieved Port entry's
          vphys_mask field.
        * Clear the dirty bit from virtual phy entry's flag field and
          continue with next HBA Phy's Phy data.
 - Delete the 'virtual phy' entries and HBA's 'Port table' entries which
   are still marked as 'dirty'.

Link: https://lore.kernel.org/r/20201027130847.9962-13-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 233 insertions, 0 deletions

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index a35c5f33666c..e5188f469d6a 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -5848,6 +5848,204 @@ _scsih_io_done(struct MPT3SAS_ADAPTER *ioc, u16 smid, u8 msix_index, u32 reply)
 }
 
 /**
+ * _scsih_update_vphys_after_reset - update the Port's
+ *			vphys_list after reset
+ * @ioc: per adapter object
+ *
+ * Returns nothing.
+ */
+static void
+_scsih_update_vphys_after_reset(struct MPT3SAS_ADAPTER *ioc)
+{
+	u16 sz, ioc_status;
+	int i;
+	Mpi2ConfigReply_t mpi_reply;
+	Mpi2SasIOUnitPage0_t *sas_iounit_pg0 = NULL;
+	u16 attached_handle;
+	u64 attached_sas_addr;
+	u8 found = 0, port_id;
+	Mpi2SasPhyPage0_t phy_pg0;
+	struct hba_port *port, *port_next, *mport;
+	struct virtual_phy *vphy, *vphy_next;
+	struct _sas_device *sas_device;
+
+	/*
+	 * Mark all the vphys objects as dirty.
+	 */
+	list_for_each_entry_safe(port, port_next,
+	    &ioc->port_table_list, list) {
+		if (!port->vphys_mask)
+			continue;
+		list_for_each_entry_safe(vphy, vphy_next,
+		    &port->vphys_list, list) {
+			vphy->flags |= MPT_VPHY_FLAG_DIRTY_PHY;
+		}
+	}
+
+	/*
+	 * Read SASIOUnitPage0 to get each HBA Phy's data.
+	 */
+	sz = offsetof(Mpi2SasIOUnitPage0_t, PhyData) +
+	    (ioc->sas_hba.num_phys * sizeof(Mpi2SasIOUnit0PhyData_t));
+	sas_iounit_pg0 = kzalloc(sz, GFP_KERNEL);
+	if (!sas_iounit_pg0) {
+		ioc_err(ioc, "failure at %s:%d/%s()!\n",
+		    __FILE__, __LINE__, __func__);
+		return;
+	}
+	if ((mpt3sas_config_get_sas_iounit_pg0(ioc, &mpi_reply,
+	    sas_iounit_pg0, sz)) != 0)
+		goto out;
+	ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
+	if (ioc_status != MPI2_IOCSTATUS_SUCCESS)
+		goto out;
+	/*
+	 * Loop over each HBA Phy.
+	 */
+	for (i = 0; i < ioc->sas_hba.num_phys; i++) {
+		/*
+		 * Check whether Phy's Negotiation Link Rate is > 1.5G or not.
+		 */
+		if ((sas_iounit_pg0->PhyData[i].NegotiatedLinkRate >> 4) <
+		    MPI2_SAS_NEG_LINK_RATE_1_5)
+			continue;
+		/*
+		 * Check whether Phy is connected to SEP device or not,
+		 * if it is SEP device then read the Phy's SASPHYPage0 data to
+		 * determine whether Phy is a virtual Phy or not. if it is
+		 * virtual phy then it is conformed that the attached remote
+		 * device is a HBA's vSES device.
+		 */
+		if (!(le32_to_cpu(
+		    sas_iounit_pg0->PhyData[i].ControllerPhyDeviceInfo) &
+		    MPI2_SAS_DEVICE_INFO_SEP))
+			continue;
+
+		if ((mpt3sas_config_get_phy_pg0(ioc, &mpi_reply, &phy_pg0,
+		    i))) {
+			ioc_err(ioc, "failure at %s:%d/%s()!\n",
+			    __FILE__, __LINE__, __func__);
+			continue;
+		}
+
+		if (!(le32_to_cpu(phy_pg0.PhyInfo) &
+		    MPI2_SAS_PHYINFO_VIRTUAL_PHY))
+			continue;
+		/*
+		 * Get the vSES device's SAS Address.
+		 */
+		attached_handle = le16_to_cpu(
+		    sas_iounit_pg0->PhyData[i].AttachedDevHandle);
+		if (_scsih_get_sas_address(ioc, attached_handle,
+		    &attached_sas_addr) != 0) {
+			ioc_err(ioc, "failure at %s:%d/%s()!\n",
+			    __FILE__, __LINE__, __func__);
+			continue;
+		}
+
+		found = 0;
+		port = port_next = NULL;
+		/*
+		 * Loop over each virtual_phy object from
+		 * each port's vphys_list.
+		 */
+		list_for_each_entry_safe(port,
+		    port_next, &ioc->port_table_list, list) {
+			if (!port->vphys_mask)
+				continue;
+			list_for_each_entry_safe(vphy, vphy_next,
+			    &port->vphys_list, list) {
+				/*
+				 * Continue with next virtual_phy object
+				 * if the object is not marked as dirty.
+				 */
+				if (!(vphy->flags & MPT_VPHY_FLAG_DIRTY_PHY))
+					continue;
+
+				/*
+				 * Continue with next virtual_phy object
+				 * if the object's SAS Address is not equals
+				 * to current Phy's vSES device SAS Address.
+				 */
+				if (vphy->sas_address != attached_sas_addr)
+					continue;
+				/*
+				 * Enable current Phy number bit in object's
+				 * phy_mask field.
+				 */
+				if (!(vphy->phy_mask & (1 << i)))
+					vphy->phy_mask = (1 << i);
+				/*
+				 * Get hba_port object from hba_port table
+				 * corresponding to current phy's Port ID.
+				 * if there is no hba_port object corresponding
+				 * to Phy's Port ID then create a new hba_port
+				 * object & add to hba_port table.
+				 */
+				port_id = sas_iounit_pg0->PhyData[i].Port;
+				mport = mpt3sas_get_port_by_id(ioc, port_id, 1);
+				if (!mport) {
+					mport = kzalloc(
+					    sizeof(struct hba_port), GFP_KERNEL);
+					if (!mport)
+						break;
+					mport->port_id = port_id;
+					ioc_info(ioc,
+					    "%s: hba_port entry: %p, port: %d is added to hba_port list\n",
+					    __func__, mport, mport->port_id);
+					list_add_tail(&mport->list,
+						&ioc->port_table_list);
+				}
+				/*
+				 * If mport & port pointers are not pointing to
+				 * same hba_port object then it means that vSES
+				 * device's Port ID got changed after reset and
+				 * hence move current virtual_phy object from
+				 * port's vphys_list to mport's vphys_list.
+				 */
+				if (port != mport) {
+					if (!mport->vphys_mask)
+						INIT_LIST_HEAD(
+						    &mport->vphys_list);
+					mport->vphys_mask |= (1 << i);
+					port->vphys_mask &= ~(1 << i);
+					list_move(&vphy->list,
+					    &mport->vphys_list);
+					sas_device = mpt3sas_get_sdev_by_addr(
+					    ioc, attached_sas_addr, port);
+					if (sas_device)
+						sas_device->port = mport;
+				}
+				/*
+				 * Earlier while updating the hba_port table,
+				 * it is determined that there is no other
+				 * direct attached device with mport's Port ID,
+				 * Hence mport was marked as dirty. Only vSES
+				 * device has this Port ID, so unmark the mport
+				 * as dirt.
+				 */
+				if (mport->flags & HBA_PORT_FLAG_DIRTY_PORT) {
+					mport->sas_address = 0;
+					mport->phy_mask = 0;
+					mport->flags &=
+					    ~HBA_PORT_FLAG_DIRTY_PORT;
+				}
+				/*
+				 * Unmark current virtual_phy object as dirty.
+				 */
+				vphy->flags &= ~MPT_VPHY_FLAG_DIRTY_PHY;
+				found = 1;
+				break;
+			}
+			if (found)
+				break;
+		}
+	}
+out:
+	kfree(sas_iounit_pg0);
+}
+
+/**
  * _scsih_get_port_table_after_reset - Construct temporary port table
  * @ioc: per adapter object
  * @port_table: address where port table needs to be constructed
@@ -6068,6 +6266,39 @@ _scsih_add_or_del_phys_from_existing_port(struct MPT3SAS_ADAPTER *ioc,
 }
 
 /**
+ * _scsih_del_dirty_vphy - delete virtual_phy objects marked as dirty.
+ * @ioc: per adapter object
+ *
+ * Returns nothing.
+ */
+static void
+_scsih_del_dirty_vphy(struct MPT3SAS_ADAPTER *ioc)
+{
+	struct hba_port *port, *port_next;
+	struct virtual_phy *vphy, *vphy_next;
+
+	list_for_each_entry_safe(port, port_next,
+	    &ioc->port_table_list, list) {
+		if (!port->vphys_mask)
+			continue;
+		list_for_each_entry_safe(vphy, vphy_next,
+		    &port->vphys_list, list) {
+			if (vphy->flags & MPT_VPHY_FLAG_DIRTY_PHY) {
+				drsprintk(ioc, ioc_info(ioc,
+				    "Deleting vphy %p entry from port id: %d\t, Phy_mask 0x%08x\n",
+				    vphy, port->port_id,
+				    vphy->phy_mask));
+				port->vphys_mask &= ~vphy->phy_mask;
+				list_del(&vphy->list);
+				kfree(vphy);
+			}
+		}
+		if (!port->vphys_mask && !port->sas_address)
+			port->flags |= HBA_PORT_FLAG_DIRTY_PORT;
+	}
+}
+
+/**
  * _scsih_del_dirty_port_entries - delete dirty port entries from port list
  *					after host reset
  *@ioc: per adapter object
@@ -10247,6 +10478,7 @@ mpt3sas_scsih_reset_done_handler(struct MPT3SAS_ADAPTER *ioc)
 	if ((!ioc->is_driver_loading) && !(disable_discovery > 0 &&
 					   !ioc->sas_hba.num_phys)) {
 		_scsih_sas_port_refresh(ioc);
+		_scsih_update_vphys_after_reset(ioc);
 		_scsih_prep_device_scan(ioc);
 		_scsih_create_enclosure_list_after_reset(ioc);
 		_scsih_search_responding_sas_devices(ioc);
@@ -10294,6 +10526,7 @@ _mpt3sas_fw_work(struct MPT3SAS_ADAPTER *ioc, struct fw_event_work *fw_event)
 			ssleep(1);
 		}
 		_scsih_remove_unresponding_devices(ioc);
+		_scsih_del_dirty_vphy(ioc);
 		_scsih_del_dirty_port_entries(ioc);
 		_scsih_scan_for_devices_after_reset(ioc);
 		_scsih_set_nvme_max_shutdown_latency(ioc);