arch/powerpc/include/asm/vas.h

   1 /*
   2  * Copyright 2016-17 IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #ifndef _ASM_POWERPC_VAS_H
  11 #define _ASM_POWERPC_VAS_H
  12
  13 /*
  14  * Min and max FIFO sizes are based on Version 1.05 Section 3.1.4.25
  15  * (Local FIFO Size Register) of the VAS workbook.
  16  */
  17 #define VAS_RX_FIFO_SIZE_MIN    (1 << 10)       /* 1KB */
  18 #define VAS_RX_FIFO_SIZE_MAX    (8 << 20)       /* 8MB */
  19
  20 /*
  21  * Threshold Control Mode: Have paste operation fail if the number of
  22  * requests in receive FIFO exceeds a threshold.
  23  *
  24  * NOTE: No special error code yet if paste is rejected because of these
  25  *       limits. So users can't distinguish between this and other errors.
  26  */
  27 #define VAS_THRESH_DISABLED             0
  28 #define VAS_THRESH_FIFO_GT_HALF_FULL    1
  29 #define VAS_THRESH_FIFO_GT_QTR_FULL     2
  30 #define VAS_THRESH_FIFO_GT_EIGHTH_FULL  3
  31
  32 /*
  33  * Get/Set bit fields
  34  */
  35 #define GET_FIELD(m, v)                (((v) & (m)) >> MASK_LSH(m))
  36 #define MASK_LSH(m)            (__builtin_ffsl(m) - 1)
  37 #define SET_FIELD(m, v, val)   \
  38                 (((v) & ~(m)) | ((((typeof(v))(val)) << MASK_LSH(m)) & (m)))
  39
  40 /*
  41  * Co-processor Engine type.
  42  */
  43 enum vas_cop_type {
  44         VAS_COP_TYPE_FAULT,
  45         VAS_COP_TYPE_842,
  46         VAS_COP_TYPE_842_HIPRI,
  47         VAS_COP_TYPE_GZIP,
  48         VAS_COP_TYPE_GZIP_HIPRI,
  49         VAS_COP_TYPE_FTW,
  50         VAS_COP_TYPE_MAX,
  51 };
  52
  53 /*
  54  * Receive window attributes specified by the (in-kernel) owner of window.
  55  */
  56 struct vas_rx_win_attr {
  57         void *rx_fifo;
  58         int rx_fifo_size;
  59         int wcreds_max;
  60
  61         bool pin_win;
  62         bool rej_no_credit;
  63         bool tx_wcred_mode;
  64         bool rx_wcred_mode;
  65         bool tx_win_ord_mode;
  66         bool rx_win_ord_mode;
  67         bool data_stamp;
  68         bool nx_win;
  69         bool fault_win;
  70         bool user_win;
  71         bool notify_disable;
  72         bool intr_disable;
  73         bool notify_early;
  74
  75         int lnotify_lpid;
  76         int lnotify_pid;
  77         int lnotify_tid;
  78         u32 pswid;
  79
  80         int tc_mode;
  81 };
  82
  83 /*
  84  * Window attributes specified by the in-kernel owner of a send window.
  85  */
  86 struct vas_tx_win_attr {
  87         enum vas_cop_type cop;
  88         int wcreds_max;
  89         int lpid;
  90         int pidr;               /* hardware PID (from SPRN_PID) */
  91         int pid;                /* linux process id */
  92         int pswid;
  93         int rsvd_txbuf_count;
  94         int tc_mode;
  95
  96         bool user_win;
  97         bool pin_win;
  98         bool rej_no_credit;
  99         bool rsvd_txbuf_enable;
 100         bool tx_wcred_mode;
 101         bool rx_wcred_mode;
 102         bool tx_win_ord_mode;
 103         bool rx_win_ord_mode;
 104 };
 105
 106 /*
 107  * Helper to map a chip id to VAS id.
 108  * For POWER9, this is a 1:1 mapping. In the future this maybe a 1:N
 109  * mapping in which case, we will need to update this helper.
 110  *
 111  * Return the VAS id or -1 if no matching vasid is found.
 112  */
 113 int chip_to_vas_id(int chipid);
 114
 115 /*
 116  * Helper to initialize receive window attributes to defaults for an
 117  * NX window.
 118  */
 119 void vas_init_rx_win_attr(struct vas_rx_win_attr *rxattr, enum vas_cop_type cop);
 120
 121 /*
 122  * Open a VAS receive window for the instance of VAS identified by @vasid
 123  * Use @attr to initialize the attributes of the window.
 124  *
 125  * Return a handle to the window or ERR_PTR() on error.
 126  */
 127 struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
 128                                    struct vas_rx_win_attr *attr);
 129
 130 /*
 131  * Helper to initialize send window attributes to defaults for an NX window.
 132  */
 133 extern void vas_init_tx_win_attr(struct vas_tx_win_attr *txattr,
 134                         enum vas_cop_type cop);
 135
 136 /*
 137  * Open a VAS send window for the instance of VAS identified by @vasid
 138  * and the co-processor type @cop. Use @attr to initialize attributes
 139  * of the window.
 140  *
 141  * Note: The instance of VAS must already have an open receive window for
 142  * the coprocessor type @cop.
 143  *
 144  * Return a handle to the send window or ERR_PTR() on error.
 145  */
 146 struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
 147                         struct vas_tx_win_attr *attr);
 148
 149 /*
 150  * Close the send or receive window identified by @win. For receive windows
 151  * return -EAGAIN if there are active send windows attached to this receive
 152  * window.
 153  */
 154 int vas_win_close(struct vas_window *win);
 155
 156 /*
 157  * Copy the co-processor request block (CRB) @crb into the local L2 cache.
 158  */
 159 int vas_copy_crb(void *crb, int offset);
 160
 161 /*
 162  * Paste a previously copied CRB (see vas_copy_crb()) from the L2 cache to
 163  * the hardware address associated with the window @win. @re is expected/
 164  * assumed to be true for NX windows.
 165  */
 166 int vas_paste_crb(struct vas_window *win, int offset, bool re);
 167
 168 #endif /* __ASM_POWERPC_VAS_H */