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um_idi.c

/* $Id: um_idi.c,v 1.14 2004/03/21 17:54:37 armin Exp $ */

#include "platform.h"
#include "di_defs.h"
#include "pc.h"
#include "dqueue.h"
#include "adapter.h"
#include "entity.h"
#include "um_xdi.h"
#include "um_idi.h"
#include "debuglib.h"
#include "divasync.h"

#define DIVAS_MAX_XDI_ADAPTERS      64

/* --------------------------------------------------------------------------
            IMPORTS
   -------------------------------------------------------------------------- */
extern void diva_os_wakeup_read(void *os_context);
extern void diva_os_wakeup_close(void *os_context);
/* --------------------------------------------------------------------------
            LOCALS
   -------------------------------------------------------------------------- */
static LIST_HEAD(adapter_q);
static diva_os_spin_lock_t adapter_lock;

static diva_um_idi_adapter_t *diva_um_idi_find_adapter(dword nr);
static void cleanup_adapter(diva_um_idi_adapter_t * a);
static void cleanup_entity(divas_um_idi_entity_t * e);
static int diva_user_mode_idi_adapter_features(diva_um_idi_adapter_t * a,
                                     diva_um_idi_adapter_features_t
                                     * features);
static int process_idi_request(divas_um_idi_entity_t * e,
                         const diva_um_idi_req_hdr_t * req);
static int process_idi_rc(divas_um_idi_entity_t * e, byte rc);
static int process_idi_ind(divas_um_idi_entity_t * e, byte ind);
static int write_return_code(divas_um_idi_entity_t * e, byte rc);

/* --------------------------------------------------------------------------
            MAIN
   -------------------------------------------------------------------------- */
int diva_user_mode_idi_init(void)
{
      diva_os_initialize_spin_lock(&adapter_lock, "adapter");
      return (0);
}

/* --------------------------------------------------------------------------
            Copy adapter features to user supplied buffer
   -------------------------------------------------------------------------- */
static int
diva_user_mode_idi_adapter_features(diva_um_idi_adapter_t * a,
                            diva_um_idi_adapter_features_t *
                            features)
{
      IDI_SYNC_REQ sync_req;

      if ((a) && (a->d.request)) {
            features->type = a->d.type;
            features->features = a->d.features;
            features->channels = a->d.channels;
            memset(features->name, 0, sizeof(features->name));

            sync_req.GetName.Req = 0;
            sync_req.GetName.Rc = IDI_SYNC_REQ_GET_NAME;
            (*(a->d.request)) ((ENTITY *) & sync_req);
            strlcpy(features->name, sync_req.GetName.name,
                  sizeof(features->name));

            sync_req.GetSerial.Req = 0;
            sync_req.GetSerial.Rc = IDI_SYNC_REQ_GET_SERIAL;
            sync_req.GetSerial.serial = 0;
            (*(a->d.request)) ((ENTITY *) & sync_req);
            features->serial_number = sync_req.GetSerial.serial;
      }

      return ((a) ? 0 : -1);
}

/* --------------------------------------------------------------------------
            REMOVE ADAPTER
   -------------------------------------------------------------------------- */
void diva_user_mode_idi_remove_adapter(int adapter_nr)
{
      struct list_head *tmp;
      diva_um_idi_adapter_t *a;

      list_for_each(tmp, &adapter_q) {
            a = list_entry(tmp, diva_um_idi_adapter_t, link);
            if (a->adapter_nr == adapter_nr) {
                  list_del(tmp);
                  cleanup_adapter(a);
                  DBG_LOG(("DIDD: del adapter(%d)", a->adapter_nr));
                  diva_os_free(0, a);
                  break;
            }
      }
}

/* --------------------------------------------------------------------------
            CALLED ON DRIVER EXIT (UNLOAD)
   -------------------------------------------------------------------------- */
void diva_user_mode_idi_finit(void)
{
      struct list_head *tmp, *safe;
      diva_um_idi_adapter_t *a;

      list_for_each_safe(tmp, safe, &adapter_q) {
            a = list_entry(tmp, diva_um_idi_adapter_t, link);
            list_del(tmp);
            cleanup_adapter(a);
            DBG_LOG(("DIDD: del adapter(%d)", a->adapter_nr));
            diva_os_free(0, a);
      }
      diva_os_destroy_spin_lock(&adapter_lock, "adapter");
}

/* -------------------------------------------------------------------------
            CREATE AND INIT IDI ADAPTER
       ------------------------------------------------------------------------- */
int diva_user_mode_idi_create_adapter(const DESCRIPTOR * d, int adapter_nr)
{
      diva_os_spin_lock_magic_t old_irql;
      diva_um_idi_adapter_t *a =
          (diva_um_idi_adapter_t *) diva_os_malloc(0,
                                         sizeof
                                         (diva_um_idi_adapter_t));

      if (!a) {
            return (-1);
      }
      memset(a, 0x00, sizeof(*a));
      INIT_LIST_HEAD(&a->entity_q);

      a->d = *d;
      a->adapter_nr = adapter_nr;

      DBG_LOG(("DIDD_ADD A(%d), type:%02x, features:%04x, channels:%d",
             adapter_nr, a->d.type, a->d.features, a->d.channels));

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "create_adapter");
      list_add_tail(&a->link, &adapter_q);
      diva_os_leave_spin_lock(&adapter_lock, &old_irql, "create_adapter");
      return (0);
}

/* ------------------------------------------------------------------------
                  Find adapter by Adapter number
   ------------------------------------------------------------------------ */
static diva_um_idi_adapter_t *diva_um_idi_find_adapter(dword nr)
{
      diva_um_idi_adapter_t *a = NULL;
      struct list_head *tmp;

      list_for_each(tmp, &adapter_q) {
            a = list_entry(tmp, diva_um_idi_adapter_t, link);
            DBG_TRC(("find_adapter: (%d)-(%d)", nr, a->adapter_nr));
            if (a->adapter_nr == (int)nr)
                  break;
            a = NULL;
      }
      return(a);
}

/* ------------------------------------------------------------------------
            Cleanup this adapter and cleanup/delete all entities assigned
            to this adapter
   ------------------------------------------------------------------------ */
static void cleanup_adapter(diva_um_idi_adapter_t * a)
{
      struct list_head *tmp, *safe;
      divas_um_idi_entity_t *e;

      list_for_each_safe(tmp, safe, &a->entity_q) {
            e = list_entry(tmp, divas_um_idi_entity_t, link);
            list_del(tmp);
            cleanup_entity(e);
            if (e->os_context) {
                  diva_os_wakeup_read(e->os_context);
                  diva_os_wakeup_close(e->os_context);
            }
      }
      memset(&a->d, 0x00, sizeof(DESCRIPTOR));
}

/* ------------------------------------------------------------------------
            Cleanup, but NOT delete this entity
   ------------------------------------------------------------------------ */
static void cleanup_entity(divas_um_idi_entity_t * e)
{
      e->os_ref = NULL;
      e->status = 0;
      e->adapter = NULL;
      e->e.Id = 0;
      e->rc_count = 0;

      e->status |= DIVA_UM_IDI_REMOVED;
      e->status |= DIVA_UM_IDI_REMOVE_PENDING;

      diva_data_q_finit(&e->data);
      diva_data_q_finit(&e->rc);
}


/* ------------------------------------------------------------------------
            Create ENTITY, link it to the adapter and remove pointer to entity
   ------------------------------------------------------------------------ */
void *divas_um_idi_create_entity(dword adapter_nr, void *file)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      diva_os_spin_lock_magic_t old_irql;

      if ((e = (divas_um_idi_entity_t *) diva_os_malloc(0, sizeof(*e)))) {
            memset(e, 0x00, sizeof(*e));
            if (!
                (e->os_context =
                 diva_os_malloc(0, diva_os_get_context_size()))) {
                  DBG_LOG(("E(%08x) no memory for os context", e));
                  diva_os_free(0, e);
                  return NULL;
            }
            memset(e->os_context, 0x00, diva_os_get_context_size());

            if ((diva_data_q_init(&e->data, 2048 + 512, 16))) {
                  diva_os_free(0, e->os_context);
                  diva_os_free(0, e);
                  return NULL;
            }
            if ((diva_data_q_init(&e->rc, sizeof(diva_um_idi_ind_hdr_t), 2))) {
                  diva_data_q_finit(&e->data);
                  diva_os_free(0, e->os_context);
                  diva_os_free(0, e);
                  return NULL;
            }

            diva_os_enter_spin_lock(&adapter_lock, &old_irql, "create_entity");
            /*
               Look for Adapter requested
             */
            if (!(a = diva_um_idi_find_adapter(adapter_nr))) {
                  /*
                     No adapter was found, or this adapter was removed
                   */
                  diva_os_leave_spin_lock(&adapter_lock, &old_irql, "create_entity");

                  DBG_LOG(("A: no adapter(%ld)", adapter_nr));

                  cleanup_entity(e);
                  diva_os_free(0, e->os_context);
                  diva_os_free(0, e);

                  return NULL;
            }

            e->os_ref = file; /* link to os handle */
            e->adapter = a;   /* link to adapter   */

            list_add_tail(&e->link, &a->entity_q);    /* link from adapter */

            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "create_entity");

            DBG_LOG(("A(%ld), create E(%08x)", adapter_nr, e));
      }

      return (e);
}

/* ------------------------------------------------------------------------
            Unlink entity and free memory 
   ------------------------------------------------------------------------ */
int divas_um_idi_delete_entity(int adapter_nr, void *entity)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      diva_os_spin_lock_magic_t old_irql;

      if (!(e = (divas_um_idi_entity_t *) entity))
            return (-1);

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "delete_entity");
      if ((a = e->adapter)) {
            list_del(&e->link);
      }
      diva_os_leave_spin_lock(&adapter_lock, &old_irql, "delete_entity");

      diva_um_idi_stop_wdog(entity);
      cleanup_entity(e);
      diva_os_free(0, e->os_context);
      memset(e, 0x00, sizeof(*e));
      diva_os_free(0, e);

      DBG_LOG(("A(%d) remove E:%08x", adapter_nr, e));

      return (0);
}

/* --------------------------------------------------------------------------
            Called by application to read data from IDI
       -------------------------------------------------------------------------- */
int diva_um_idi_read(void *entity,
                 void *os_handle,
                 void *dst,
                 int max_length, divas_um_idi_copy_to_user_fn_t cp_fn)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      const void *data;
      int length, ret = 0;
      diva_um_idi_data_queue_t *q;
      diva_os_spin_lock_magic_t old_irql;

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "read");

      e = (divas_um_idi_entity_t *) entity;
      if (!e || (!(a = e->adapter)) ||
          (e->status & DIVA_UM_IDI_REMOVE_PENDING) ||
          (e->status & DIVA_UM_IDI_REMOVED) ||
          (a->status & DIVA_UM_IDI_ADAPTER_REMOVED)) {
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "read");
            DBG_ERR(("E(%08x) read failed - adapter removed", e))
            return (-1);
      }

      DBG_TRC(("A(%d) E(%08x) read(%d)", a->adapter_nr, e, max_length));

      /*
         Try to read return code first
       */
      data = diva_data_q_get_segment4read(&e->rc);
      q = &e->rc;

      /*
         No return codes available, read indications now
       */
      if (!data) {
            if (!(e->status & DIVA_UM_IDI_RC_PENDING)) {
                  DBG_TRC(("A(%d) E(%08x) read data", a->adapter_nr, e));
                  data = diva_data_q_get_segment4read(&e->data);
                  q = &e->data;
            }
      } else {
            e->status &= ~DIVA_UM_IDI_RC_PENDING;
            DBG_TRC(("A(%d) E(%08x) read rc", a->adapter_nr, e));
      }

      if (data) {
            if ((length = diva_data_q_get_segment_length(q)) >
                max_length) {
                  /*
                     Not enough space to read message
                   */
                  DBG_ERR(("A: A(%d) E(%08x) read small buffer",
                         a->adapter_nr, e, ret));
                  diva_os_leave_spin_lock(&adapter_lock, &old_irql,
                                    "read");
                  return (-2);
            }
            /*
               Copy it to user, this function does access ONLY locked an verified
               memory, also we can access it witch spin lock held
             */

            if ((ret = (*cp_fn) (os_handle, dst, data, length)) >= 0) {
                  /*
                     Acknowledge only if read was successfull
                   */
                  diva_data_q_ack_segment4read(q);
            }
      }


      DBG_TRC(("A(%d) E(%08x) read=%d", a->adapter_nr, e, ret));

      diva_os_leave_spin_lock(&adapter_lock, &old_irql, "read");

      return (ret);
}


int diva_um_idi_write(void *entity,
                  void *os_handle,
                  const void *src,
                  int length, divas_um_idi_copy_from_user_fn_t cp_fn)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      diva_um_idi_req_hdr_t *req;
      void *data;
      int ret = 0;
      diva_os_spin_lock_magic_t old_irql;

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "write");

      e = (divas_um_idi_entity_t *) entity;
      if (!e || (!(a = e->adapter)) ||
          (e->status & DIVA_UM_IDI_REMOVE_PENDING) ||
          (e->status & DIVA_UM_IDI_REMOVED) ||
          (a->status & DIVA_UM_IDI_ADAPTER_REMOVED)) {
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
            DBG_ERR(("E(%08x) write failed - adapter removed", e))
            return (-1);
      }

      DBG_TRC(("A(%d) E(%08x) write(%d)", a->adapter_nr, e, length));

      if ((length < sizeof(*req)) || (length > sizeof(e->buffer))) {
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
            return (-2);
      }

      if (e->status & DIVA_UM_IDI_RC_PENDING) {
            DBG_ERR(("A: A(%d) E(%08x) rc pending", a->adapter_nr, e));
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
            return (-1);      /* should wait for RC code first */
      }

      /*
         Copy function does access only locked verified memory,
         also it can be called with spin lock held
       */
      if ((ret = (*cp_fn) (os_handle, e->buffer, src, length)) < 0) {
            DBG_TRC(("A: A(%d) E(%08x) write error=%d", a->adapter_nr,
                   e, ret));
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
            return (ret);
      }

      req = (diva_um_idi_req_hdr_t *) & e->buffer[0];

      switch (req->type) {
      case DIVA_UM_IDI_GET_FEATURES:{
                  DBG_LOG(("A(%d) get_features", a->adapter_nr));
                  if (!(data =
                       diva_data_q_get_segment4write(&e->data))) {
                        DBG_ERR(("A(%d) get_features, no free buffer",
                               a->adapter_nr));
                        diva_os_leave_spin_lock(&adapter_lock,
                                          &old_irql,
                                          "write");
                        return (0);
                  }
                  diva_user_mode_idi_adapter_features(a, &(((diva_um_idi_ind_hdr_t
                                                *) data)->hdr.features));
                  ((diva_um_idi_ind_hdr_t *) data)->type =
                      DIVA_UM_IDI_IND_FEATURES;
                  ((diva_um_idi_ind_hdr_t *) data)->data_length = 0;
                  diva_data_q_ack_segment4write(&e->data,
                                          sizeof(diva_um_idi_ind_hdr_t));

                  diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");

                  diva_os_wakeup_read(e->os_context);
            }
            break;

      case DIVA_UM_IDI_REQ:
      case DIVA_UM_IDI_REQ_MAN:
      case DIVA_UM_IDI_REQ_SIG:
      case DIVA_UM_IDI_REQ_NET:
            DBG_TRC(("A(%d) REQ(%02d)-(%02d)-(%08x)", a->adapter_nr,
                   req->Req, req->ReqCh,
                   req->type & DIVA_UM_IDI_REQ_TYPE_MASK));
            switch (process_idi_request(e, req)) {
            case -1:
                  diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
                  return (-1);
            case -2:
                  diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
                  diva_os_wakeup_read(e->os_context);
                  break;
            default:
                  diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
                  break;
            }
            break;

      default:
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "write");
            return (-1);
      }

      DBG_TRC(("A(%d) E(%08x) write=%d", a->adapter_nr, e, ret));

      return (ret);
}

/* --------------------------------------------------------------------------
                  CALLBACK FROM XDI
       -------------------------------------------------------------------------- */
static void diva_um_idi_xdi_callback(ENTITY * entity)
{
      divas_um_idi_entity_t *e = DIVAS_CONTAINING_RECORD(entity,
                                             divas_um_idi_entity_t,
                                             e);
      diva_os_spin_lock_magic_t old_irql;
      int call_wakeup = 0;

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "xdi_callback");

      if (e->e.complete == 255) {
            if (!(e->status & DIVA_UM_IDI_REMOVE_PENDING)) {
                  diva_um_idi_stop_wdog(e);
            }
            if ((call_wakeup = process_idi_rc(e, e->e.Rc))) {
                  if (e->rc_count) {
                        e->rc_count--;
                  }
            }
            e->e.Rc = 0;
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "xdi_callback");

            if (call_wakeup) {
                  diva_os_wakeup_read(e->os_context);
                  diva_os_wakeup_close(e->os_context);
            }
      } else {
            if (e->status & DIVA_UM_IDI_REMOVE_PENDING) {
                  e->e.RNum = 0;
                  e->e.RNR = 2;
            } else {
                  call_wakeup = process_idi_ind(e, e->e.Ind);
            }
            e->e.Ind = 0;
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "xdi_callback");
            if (call_wakeup) {
                  diva_os_wakeup_read(e->os_context);
            }
      }
}

static int process_idi_request(divas_um_idi_entity_t * e,
                         const diva_um_idi_req_hdr_t * req)
{
      int assign = 0;
      byte Req = (byte) req->Req;
      dword type = req->type & DIVA_UM_IDI_REQ_TYPE_MASK;

      if (!e->e.Id || !e->e.callback) {   /* not assigned */
            if (Req != ASSIGN) {
                  DBG_ERR(("A: A(%d) E(%08x) not assigned",
                         e->adapter->adapter_nr, e));
                  return (-1);      /* NOT ASSIGNED */
            } else {
                  switch (type) {
                  case DIVA_UM_IDI_REQ_TYPE_MAN:
                        e->e.Id = MAN_ID;
                        DBG_TRC(("A(%d) E(%08x) assign MAN",
                               e->adapter->adapter_nr, e));
                        break;

                  case DIVA_UM_IDI_REQ_TYPE_SIG:
                        e->e.Id = DSIG_ID;
                        DBG_TRC(("A(%d) E(%08x) assign SIG",
                               e->adapter->adapter_nr, e));
                        break;

                  case DIVA_UM_IDI_REQ_TYPE_NET:
                        e->e.Id = NL_ID;
                        DBG_TRC(("A(%d) E(%08x) assign NET",
                               e->adapter->adapter_nr, e));
                        break;

                  default:
                        DBG_ERR(("A: A(%d) E(%08x) unknown type=%08x",
                               e->adapter->adapter_nr, e,
                               type));
                        return (-1);
                  }
            }
            e->e.XNum = 1;
            e->e.RNum = 1;
            e->e.callback = diva_um_idi_xdi_callback;
            e->e.X = &e->XData;
            e->e.R = &e->RData;
            assign = 1;
      }
      e->status |= DIVA_UM_IDI_RC_PENDING;
      e->e.Req = Req;
      e->e.ReqCh = (byte) req->ReqCh;
      e->e.X->PLength = (word) req->data_length;
      e->e.X->P = (byte *) & req[1];      /* Our buffer is safe */

      DBG_TRC(("A(%d) E(%08x) request(%02x-%02x-%02x (%d))",
             e->adapter->adapter_nr, e, e->e.Id, e->e.Req,
             e->e.ReqCh, e->e.X->PLength));

      e->rc_count++;

      if (e->adapter && e->adapter->d.request) {
            diva_um_idi_start_wdog(e);
            (*(e->adapter->d.request)) (&e->e);
      }

      if (assign) {
            if (e->e.Rc == OUT_OF_RESOURCES) {
                  /*
                     XDI has no entities more, call was not forwarded to the card,
                     no callback will be scheduled
                   */
                  DBG_ERR(("A: A(%d) E(%08x) XDI out of entities",
                         e->adapter->adapter_nr, e));

                  e->e.Id = 0;
                  e->e.ReqCh = 0;
                  e->e.RcCh = 0;
                  e->e.Ind = 0;
                  e->e.IndCh = 0;
                  e->e.XNum = 0;
                  e->e.RNum = 0;
                  e->e.callback = NULL;
                  e->e.X = NULL;
                  e->e.R = NULL;
                  write_return_code(e, ASSIGN_RC | OUT_OF_RESOURCES);
                  return (-2);
            } else {
                  e->status |= DIVA_UM_IDI_ASSIGN_PENDING;
            }
      }

      return (0);
}

static int process_idi_rc(divas_um_idi_entity_t * e, byte rc)
{
      DBG_TRC(("A(%d) E(%08x) rc(%02x-%02x-%02x)",
             e->adapter->adapter_nr, e, e->e.Id, rc, e->e.RcCh));

      if (e->status & DIVA_UM_IDI_ASSIGN_PENDING) {
            e->status &= ~DIVA_UM_IDI_ASSIGN_PENDING;
            if (rc != ASSIGN_OK) {
                  DBG_ERR(("A: A(%d) E(%08x) ASSIGN failed",
                         e->adapter->adapter_nr, e));
                  e->e.callback = NULL;
                  e->e.Id = 0;
                  e->e.Req = 0;
                  e->e.ReqCh = 0;
                  e->e.Rc = 0;
                  e->e.RcCh = 0;
                  e->e.Ind = 0;
                  e->e.IndCh = 0;
                  e->e.X = NULL;
                  e->e.R = NULL;
                  e->e.XNum = 0;
                  e->e.RNum = 0;
            }
      }
      if ((e->e.Req == REMOVE) && e->e.Id && (rc == 0xff)) {
            DBG_ERR(("A: A(%d) E(%08x)  discard OK in REMOVE",
                   e->adapter->adapter_nr, e));
            return (0); /* let us do it in the driver */
      }
      if ((e->e.Req == REMOVE) && (!e->e.Id)) { /* REMOVE COMPLETE */
            e->e.callback = NULL;
            e->e.Id = 0;
            e->e.Req = 0;
            e->e.ReqCh = 0;
            e->e.Rc = 0;
            e->e.RcCh = 0;
            e->e.Ind = 0;
            e->e.IndCh = 0;
            e->e.X = NULL;
            e->e.R = NULL;
            e->e.XNum = 0;
            e->e.RNum = 0;
            e->rc_count = 0;
      }
      if ((e->e.Req == REMOVE) && (rc != 0xff)) {     /* REMOVE FAILED */
            DBG_ERR(("A: A(%d) E(%08x)  REMOVE FAILED",
                   e->adapter->adapter_nr, e));
      }
      write_return_code(e, rc);

      return (1);
}

static int process_idi_ind(divas_um_idi_entity_t * e, byte ind)
{
      int do_wakeup = 0;

      if (e->e.complete != 0x02) {
            diva_um_idi_ind_hdr_t *pind =
                (diva_um_idi_ind_hdr_t *)
                diva_data_q_get_segment4write(&e->data);
            if (pind) {
                  e->e.RNum = 1;
                  e->e.R->P = (byte *) & pind[1];
                  e->e.R->PLength =
                      (word) (diva_data_q_get_max_length(&e->data) -
                            sizeof(*pind));
                  DBG_TRC(("A(%d) E(%08x) ind_1(%02x-%02x-%02x)-[%d-%d]",
                         e->adapter->adapter_nr, e, e->e.Id, ind,
                         e->e.IndCh, e->e.RLength,
                         e->e.R->PLength));

            } else {
                  DBG_TRC(("A(%d) E(%08x) ind(%02x-%02x-%02x)-RNR",
                         e->adapter->adapter_nr, e, e->e.Id, ind,
                         e->e.IndCh));
                  e->e.RNum = 0;
                  e->e.RNR = 1;
                  do_wakeup = 1;
            }
      } else {
            diva_um_idi_ind_hdr_t *pind =
                (diva_um_idi_ind_hdr_t *) (e->e.R->P);

            DBG_TRC(("A(%d) E(%08x) ind(%02x-%02x-%02x)-[%d]",
                   e->adapter->adapter_nr, e, e->e.Id, ind,
                   e->e.IndCh, e->e.R->PLength));

            pind--;
            pind->type = DIVA_UM_IDI_IND;
            pind->hdr.ind.Ind = ind;
            pind->hdr.ind.IndCh = e->e.IndCh;
            pind->data_length = e->e.R->PLength;
            diva_data_q_ack_segment4write(&e->data,
                                    (int) (sizeof(*pind) +
                                         e->e.R->PLength));
            do_wakeup = 1;
      }

      if ((e->status & DIVA_UM_IDI_RC_PENDING) && !e->rc.count) {
            do_wakeup = 0;
      }

      return (do_wakeup);
}

/* --------------------------------------------------------------------------
            Write return code to the return code queue of entity
       -------------------------------------------------------------------------- */
static int write_return_code(divas_um_idi_entity_t * e, byte rc)
{
      diva_um_idi_ind_hdr_t *prc;

      if (!(prc =
           (diva_um_idi_ind_hdr_t *) diva_data_q_get_segment4write(&e->rc)))
      {
            DBG_ERR(("A: A(%d) E(%08x) rc(%02x) lost",
                   e->adapter->adapter_nr, e, rc));
            e->status &= ~DIVA_UM_IDI_RC_PENDING;
            return (-1);
      }

      prc->type = DIVA_UM_IDI_IND_RC;
      prc->hdr.rc.Rc = rc;
      prc->hdr.rc.RcCh = e->e.RcCh;
      prc->data_length = 0;
      diva_data_q_ack_segment4write(&e->rc, sizeof(*prc));

      return (0);
}

/* --------------------------------------------------------------------------
            Return amount of entries that can be bead from this entity or
            -1 if adapter was removed
       -------------------------------------------------------------------------- */
int diva_user_mode_idi_ind_ready(void *entity, void *os_handle)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      diva_os_spin_lock_magic_t old_irql;
      int ret;

      if (!entity)
            return (-1);
      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "ind_ready");
      e = (divas_um_idi_entity_t *) entity;
      a = e->adapter;

      if ((!a) || (a->status & DIVA_UM_IDI_ADAPTER_REMOVED)) {
            /*
               Adapter was unloaded
             */
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "ind_ready");
            return (-1);      /* adapter was removed */
      }
      if (e->status & DIVA_UM_IDI_REMOVED) {
            /*
               entity was removed as result of adapter removal
               user should assign this entity again
             */
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "ind_ready");
            return (-1);
      }

      ret = e->rc.count + e->data.count;

      if ((e->status & DIVA_UM_IDI_RC_PENDING) && !e->rc.count) {
            ret = 0;
      }

      diva_os_leave_spin_lock(&adapter_lock, &old_irql, "ind_ready");

      return (ret);
}

void *diva_um_id_get_os_context(void *entity)
{
      return (((divas_um_idi_entity_t *) entity)->os_context);
}

int divas_um_idi_entity_assigned(void *entity)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      int ret;
      diva_os_spin_lock_magic_t old_irql;

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "assigned?");


      e = (divas_um_idi_entity_t *) entity;
      if (!e || (!(a = e->adapter)) ||
          (e->status & DIVA_UM_IDI_REMOVED) ||
          (a->status & DIVA_UM_IDI_ADAPTER_REMOVED)) {
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "assigned?");
            return (0);
      }

      e->status |= DIVA_UM_IDI_REMOVE_PENDING;

      ret = (e->e.Id || e->rc_count
             || (e->status & DIVA_UM_IDI_ASSIGN_PENDING));

      DBG_TRC(("Id:%02x, rc_count:%d, status:%08x", e->e.Id, e->rc_count,
             e->status))

      diva_os_leave_spin_lock(&adapter_lock, &old_irql, "assigned?");

      return (ret);
}

int divas_um_idi_entity_start_remove(void *entity)
{
      divas_um_idi_entity_t *e;
      diva_um_idi_adapter_t *a;
      diva_os_spin_lock_magic_t old_irql;

      diva_os_enter_spin_lock(&adapter_lock, &old_irql, "start_remove");

      e = (divas_um_idi_entity_t *) entity;
      if (!e || (!(a = e->adapter)) ||
          (e->status & DIVA_UM_IDI_REMOVED) ||
          (a->status & DIVA_UM_IDI_ADAPTER_REMOVED)) {
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "start_remove");
            return (0);
      }

      if (e->rc_count) {
            /*
               Entity BUSY
             */
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "start_remove");
            return (1);
      }

      if (!e->e.Id) {
            /*
               Remove request was already pending, and arrived now
             */
            diva_os_leave_spin_lock(&adapter_lock, &old_irql, "start_remove");
            return (0); /* REMOVE was pending */
      }

      /*
         Now send remove request
       */
      e->e.Req = REMOVE;
      e->e.ReqCh = 0;

      e->rc_count++;

      DBG_TRC(("A(%d) E(%08x) request(%02x-%02x-%02x (%d))",
             e->adapter->adapter_nr, e, e->e.Id, e->e.Req,
             e->e.ReqCh, e->e.X->PLength));

      if (a->d.request)
            (*(a->d.request)) (&e->e);

      diva_os_leave_spin_lock(&adapter_lock, &old_irql, "start_remove");

      return (0);
}

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