[SCSI] fusion - exposing raid components in mptsas

Suppport for exposing hidden raid components
for sg interface. The sdev->no_uld_attach flag
will set set accordingly.

The sas module supports adding/removing raid
volumes using online storage management application
interface.

This patch rely's on patch's provided to me
by Christoph Hellwig, that exports device_reprobe.
I will post those patch's on behalf of Christoph.

Signed-off-by: Eric Moore <Eric.Moore@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 86 insertions, 26 deletions

diff --git a/drivers/message/fusion/mptsas.c b/drivers/message/fusion/mptsas.c
index b6a6f27082b6..289fcdbe89ba 100644
--- a/drivers/message/fusion/mptsas.c
+++ b/drivers/message/fusion/mptsas.c
@@ -104,6 +104,8 @@ struct mptsas_hotplug_event {
         u16                     handle;
         u16                     parent_handle;
         u8                      phy_id;
+        u8                      phys_disk_num;
+        u8                      phys_disk_num_valid;
 };
 
 /*
@@ -139,6 +141,7 @@ struct mptsas_phyinfo {
         struct mptsas_devinfo attached; /* point to attached device info */
         struct sas_phy *phy;
         struct sas_rphy *rphy;
+        struct scsi_target *starget;
 };
 
 struct mptsas_portinfo {
@@ -388,6 +391,17 @@ mptsas_slave_alloc(struct scsi_device *sdev)
                                 target_id = p->phy_info[i].attached.id;
                                 vtarget->bus_id = p->phy_info[i].attached.channel;
                                 vdev->lun = sdev->lun;
+                                p->phy_info[i].starget = sdev->sdev_target;
+                                /*
+                                 * Exposing hidden disk (RAID)
+                                 */
+                                if (mptscsih_is_phys_disk(hd->ioc, target_id)) {
+                                        target_id = mptscsih_raid_id_to_num(hd,
+                                                        target_id);
+                                        vdev->vtarget->tflags |=
+                                            MPT_TARGET_FLAGS_RAID_COMPONENT;
+                                        sdev->no_uld_attach = 1;
+                                }
                                 mutex_unlock(&hd->ioc->sas_topology_mutex);
                                 goto out;
                         }
@@ -1378,10 +1392,24 @@ mptsas_scan_sas_topology(MPT_ADAPTER *ioc)
 {
         u32 handle = 0xFFFF;
         int index = 0;
+        int i;
 
         mptsas_probe_hba_phys(ioc, &index);
         while (!mptsas_probe_expander_phys(ioc, &handle, &index))
                 ;
+        /*
+          Reporting RAID volumes.
+        */
+        if (!ioc->raid_data.pIocPg2)
+                goto out;
+        if (!ioc->raid_data.pIocPg2->NumActiveVolumes)
+                goto out;
+        for (i=0; i<ioc->raid_data.pIocPg2->NumActiveVolumes; i++) {
+                scsi_add_device(ioc->sh, ioc->num_ports,
+                    ioc->raid_data.pIocPg2->RaidVolume[i].VolumeID, 0);
+        }
+ out:
+        return;
 }
 
 static struct mptsas_phyinfo *
@@ -1461,6 +1489,20 @@ mptscsih_sas_persist_clear_table(void * arg)
 }
 
 static void
+mptsas_reprobe_lun(struct scsi_device *sdev, void *data)
+{
+        sdev->no_uld_attach = data ? 1 : 0;
+        scsi_device_reprobe(sdev);
+}
+
+static void
+mptsas_reprobe_target(struct scsi_target *starget, int uld_attach)
+{
+        starget_for_each_device(starget, uld_attach ? (void *)1 : NULL,
+                        mptsas_reprobe_lun);
+}
+
+static void
 mptsas_hotplug_work(void *arg)
 {
         struct mptsas_hotplug_event *ev = arg;
@@ -1470,14 +1512,33 @@ mptsas_hotplug_work(void *arg)
         struct scsi_device *sdev;
         char *ds = NULL;
         struct mptsas_devinfo sas_device;
+        VirtTarget *vtarget;
 
         switch (ev->event_type) {
         case MPTSAS_DEL_DEVICE:
 
                 phy_info = mptsas_find_phyinfo_by_target(ioc, ev->id);
-                if (!phy_info) {
-                        printk("mptsas: remove event for non-existant PHY.\n");
+                /*
+                 * Sanity checks, for non-existing phys and remote rphys.
+                 */
+                if (!phy_info)
                         break;
+                if (!phy_info->rphy)
+                        break;
+                if (phy_info->starget) {
+                        vtarget = phy_info->starget->hostdata;
+
+                        if (!vtarget)
+                                break;
+                        /*
+                         * Handling  RAID components
+                         */
+                        if (ev->phys_disk_num_valid) {
+                                vtarget->target_id = ev->phys_disk_num;
+                                vtarget->tflags |= MPT_TARGET_FLAGS_RAID_COMPONENT;
+                                mptsas_reprobe_target(vtarget->starget, 1);
+                                break;
+                        }
                 }
 
                 if (phy_info->attached.device_info & MPI_SAS_DEVICE_INFO_SSP_TARGET)
@@ -1491,11 +1552,10 @@ mptsas_hotplug_work(void *arg)
                        "removing %s device, channel %d, id %d, phy %d\n",
                        ioc->name, ds, ev->channel, ev->id, phy_info->phy_id);
 
-                if (phy_info->rphy) {
-                        sas_rphy_delete(phy_info->rphy);
-                        memset(&phy_info->attached, 0, sizeof(struct mptsas_devinfo));
-                        phy_info->rphy = NULL;
-                }
+                sas_rphy_delete(phy_info->rphy);
+                memset(&phy_info->attached, 0, sizeof(struct mptsas_devinfo));
+                phy_info->rphy = NULL;
+                phy_info->starget = NULL;
                 break;
         case MPTSAS_ADD_DEVICE:
 
@@ -1509,16 +1569,27 @@ mptsas_hotplug_work(void *arg)
 
                 phy_info = mptsas_find_phyinfo_by_parent(ioc,
                                 sas_device.handle_parent, sas_device.phy_id);
-                if (!phy_info) {
-                        printk("mptsas: add event for non-existant PHY.\n");
+                if (!phy_info)
                         break;
-                }
+                if (phy_info->starget) {
+                        vtarget = phy_info->starget->hostdata;
 
-                if (phy_info->rphy) {
-                        printk("mptsas: trying to add existing device.\n");
+                        if (!vtarget)
+                                break;
+                        /*
+                         * Handling  RAID components
+                         */
+                        if (vtarget->tflags & MPT_TARGET_FLAGS_RAID_COMPONENT) {
+                                vtarget->tflags &= ~MPT_TARGET_FLAGS_RAID_COMPONENT;
+                                vtarget->target_id = ev->id;
+                                mptsas_reprobe_target(phy_info->starget, 0);
+                        }
                         break;
                 }
 
+                if (phy_info->rphy)
+                        break;
+
                 memcpy(&phy_info->attached, &sas_device,
                     sizeof(struct mptsas_devinfo));
 
@@ -1672,6 +1743,9 @@ mptscsih_send_raid_event(MPT_ADAPTER *ioc,
                 ev->event_type = MPTSAS_ADD_DEVICE;
                 break;
         case MPI_EVENT_RAID_RC_PHYSDISK_CREATED:
+                ioc->raid_data.isRaid = 1;
+                ev->phys_disk_num_valid = 1;
+                ev->phys_disk_num = raid_event_data->PhysDiskNum;
                 ev->event_type = MPTSAS_DEL_DEVICE;
                 break;
         case MPI_EVENT_RAID_RC_VOLUME_DELETED:
@@ -1932,20 +2006,6 @@ mptsas_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
         mptsas_scan_sas_topology(ioc);
 
-        /*
-          Reporting RAID volumes.
-        */
-        if (!ioc->raid_data.pIocPg2)
-                return 0;
-        if (!ioc->raid_data.pIocPg2->NumActiveVolumes)
-                return 0;
-        for (ii=0;ii<ioc->raid_data.pIocPg2->NumActiveVolumes;ii++) {
-                scsi_add_device(sh,
-                        ioc->num_ports,
-                        ioc->raid_data.pIocPg2->RaidVolume[ii].VolumeID,
-                        0);
-        }
-
         return 0;
 
 out_mptsas_probe: