drivers/scsi/bfa/bfa_sgpg_priv.h

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 /**
  19  *  hal_sgpg.h BFA SG page module
  20  */
  21
  22 #ifndef __BFA_SGPG_PRIV_H__
  23 #define __BFA_SGPG_PRIV_H__
  24
  25 #include <cs/bfa_q.h>
  26
  27 #define BFA_SGPG_MIN    (16)
  28
  29 /**
  30  * Alignment macro for SG page allocation
  31  */
  32 #define BFA_SGPG_ROUNDUP(_l) (((_l) + (sizeof(struct bfi_sgpg_s) - 1)) \
  33                         & ~(sizeof(struct bfi_sgpg_s) - 1))
  34
  35 struct bfa_sgpg_wqe_s {
  36         struct list_head qe;    /*  queue sg page element       */
  37         int     nsgpg;          /*  pages to be allocated       */
  38         int     nsgpg_total;    /*  total pages required        */
  39         void    (*cbfn) (void *cbarg);
  40                                 /*  callback function           */
  41         void    *cbarg;         /*  callback arg                */
  42         struct list_head sgpg_q;        /*  queue of alloced sgpgs      */
  43 };
  44
  45 struct bfa_sgpg_s {
  46         struct list_head        qe;     /*  queue sg page element       */
  47         struct bfi_sgpg_s *sgpg; /*  va of SG page              */
  48         union bfi_addr_u sgpg_pa;/*  pa of SG page              */
  49 };
  50
  51 /**
  52  * Given number of SG elements, BFA_SGPG_NPAGE() returns the number of
  53  * SG pages required.
  54  */
  55 #define BFA_SGPG_NPAGE(_nsges)  (((_nsges) / BFI_SGPG_DATA_SGES) + 1)
  56
  57 struct bfa_sgpg_mod_s {
  58         struct bfa_s *bfa;
  59         int             num_sgpgs;      /*  number of SG pages          */
  60         int             free_sgpgs;     /*  number of free SG pages     */
  61         struct bfa_sgpg_s *hsgpg_arr;   /*  BFA SG page array   */
  62         struct bfi_sgpg_s *sgpg_arr;    /*  actual SG page array        */
  63         u64     sgpg_arr_pa;    /*  SG page array DMA addr      */
  64         struct list_head sgpg_q;        /*  queue of free SG pages      */
  65         struct list_head sgpg_wait_q; /*  wait queue for SG pages       */
  66 };
  67 #define BFA_SGPG_MOD(__bfa)     (&(__bfa)->modules.sgpg_mod)
  68
  69 bfa_status_t    bfa_sgpg_malloc(struct bfa_s *bfa, struct list_head *sgpg_q,
  70                                                                 int nsgpgs);
  71 void            bfa_sgpg_mfree(struct bfa_s *bfa, struct list_head *sgpg_q,
  72                                                                 int nsgpgs);
  73 void            bfa_sgpg_winit(struct bfa_sgpg_wqe_s *wqe,
  74                                    void (*cbfn) (void *cbarg), void *cbarg);
  75 void            bfa_sgpg_wait(struct bfa_s *bfa, struct bfa_sgpg_wqe_s *wqe,
  76                                                                 int nsgpgs);
  77 void            bfa_sgpg_wcancel(struct bfa_s *bfa, struct bfa_sgpg_wqe_s *wqe);
  78
  79 #endif /* __BFA_SGPG_PRIV_H__ */