drivers/crypto/cavium/zip/zip_deflate.c

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  45
  46 #include <linux/delay.h>
  47 #include <linux/sched.h>
  48
  49 #include "common.h"
  50 #include "zip_deflate.h"
  51
  52 /* Prepares the deflate zip command */
  53 static int prepare_zip_command(struct zip_operation *zip_ops,
  54                                struct zip_state *s, union zip_inst_s *zip_cmd)
  55 {
  56         union zip_zres_s *result_ptr = &s->result;
  57
  58         memset(zip_cmd, 0, sizeof(s->zip_cmd));
  59         memset(result_ptr, 0, sizeof(s->result));
  60
  61         /* IWORD #0 */
  62         /* History gather */
  63         zip_cmd->s.hg = 0;
  64         /* compression enable = 1 for deflate */
  65         zip_cmd->s.ce = 1;
  66         /* sf (sync flush) */
  67         zip_cmd->s.sf = 1;
  68         /* ef (end of file) */
  69         if (zip_ops->flush == ZIP_FLUSH_FINISH) {
  70                 zip_cmd->s.ef = 1;
  71                 zip_cmd->s.sf = 0;
  72         }
  73
  74         zip_cmd->s.cc = zip_ops->ccode;
  75         /* ss (compression speed/storage) */
  76         zip_cmd->s.ss = zip_ops->speed;
  77
  78         /* IWORD #1 */
  79         /* adler checksum */
  80         zip_cmd->s.adlercrc32 = zip_ops->csum;
  81         zip_cmd->s.historylength = zip_ops->history_len;
  82         zip_cmd->s.dg = 0;
  83
  84         /* IWORD # 6 and 7 - compression input/history pointer */
  85         zip_cmd->s.inp_ptr_addr.s.addr  = __pa(zip_ops->input);
  86         zip_cmd->s.inp_ptr_ctl.s.length = (zip_ops->input_len +
  87                                            zip_ops->history_len);
  88         zip_cmd->s.ds = 0;
  89
  90         /* IWORD # 8 and 9 - Output pointer */
  91         zip_cmd->s.out_ptr_addr.s.addr  = __pa(zip_ops->output);
  92         zip_cmd->s.out_ptr_ctl.s.length = zip_ops->output_len;
  93         /* maximum number of output-stream bytes that can be written */
  94         zip_cmd->s.totaloutputlength    = zip_ops->output_len;
  95
  96         /* IWORD # 10 and 11 - Result pointer */
  97         zip_cmd->s.res_ptr_addr.s.addr = __pa(result_ptr);
  98         /* Clearing completion code */
  99         result_ptr->s.compcode = 0;
 100
 101         return 0;
 102 }
 103
 104 /**
 105  * zip_deflate - API to offload deflate operation to hardware
 106  * @zip_ops: Pointer to zip operation structure
 107  * @s:       Pointer to the structure representing zip state
 108  * @zip_dev: Pointer to zip device structure
 109  *
 110  * This function prepares the zip deflate command and submits it to the zip
 111  * engine for processing.
 112  *
 113  * Return: 0 if successful or error code
 114  */
 115 int zip_deflate(struct zip_operation *zip_ops, struct zip_state *s,
 116                 struct zip_device *zip_dev)
 117 {
 118         union zip_inst_s *zip_cmd = &s->zip_cmd;
 119         union zip_zres_s *result_ptr = &s->result;
 120         u32 queue;
 121
 122         /* Prepares zip command based on the input parameters */
 123         prepare_zip_command(zip_ops, s, zip_cmd);
 124
 125         atomic64_add(zip_ops->input_len, &zip_dev->stats.comp_in_bytes);
 126         /* Loads zip command into command queues and rings door bell */
 127         queue = zip_load_instr(zip_cmd, zip_dev);
 128
 129         /* Stats update for compression requests submitted */
 130         atomic64_inc(&zip_dev->stats.comp_req_submit);
 131
 132         /* Wait for completion or error */
 133         zip_poll_result(result_ptr);
 134
 135         /* Stats update for compression requests completed */
 136         atomic64_inc(&zip_dev->stats.comp_req_complete);
 137
 138         zip_ops->compcode = result_ptr->s.compcode;
 139         switch (zip_ops->compcode) {
 140         case ZIP_CMD_NOTDONE:
 141                 zip_dbg("Zip instruction not yet completed");
 142                 return ZIP_ERROR;
 143
 144         case ZIP_CMD_SUCCESS:
 145                 zip_dbg("Zip instruction completed successfully");
 146                 zip_update_cmd_bufs(zip_dev, queue);
 147                 break;
 148
 149         case ZIP_CMD_DTRUNC:
 150                 zip_dbg("Output Truncate error");
 151                 /* Returning ZIP_ERROR to avoid copy to user */
 152                 return ZIP_ERROR;
 153
 154         default:
 155                 zip_err("Zip instruction failed. Code:%d", zip_ops->compcode);
 156                 return ZIP_ERROR;
 157         }
 158
 159         /* Update the CRC depending on the format */
 160         switch (zip_ops->format) {
 161         case RAW_FORMAT:
 162                 zip_dbg("RAW Format: %d ", zip_ops->format);
 163                 /* Get checksum from engine, need to feed it again */
 164                 zip_ops->csum = result_ptr->s.adler32;
 165                 break;
 166
 167         case ZLIB_FORMAT:
 168                 zip_dbg("ZLIB Format: %d ", zip_ops->format);
 169                 zip_ops->csum = result_ptr->s.adler32;
 170                 break;
 171
 172         case GZIP_FORMAT:
 173                 zip_dbg("GZIP Format: %d ", zip_ops->format);
 174                 zip_ops->csum = result_ptr->s.crc32;
 175                 break;
 176
 177         case LZS_FORMAT:
 178                 zip_dbg("LZS Format: %d ", zip_ops->format);
 179                 break;
 180
 181         default:
 182                 zip_err("Unknown Format:%d\n", zip_ops->format);
 183         }
 184
 185         atomic64_add(result_ptr->s.totalbyteswritten,
 186                      &zip_dev->stats.comp_out_bytes);
 187
 188         /* Update output_len */
 189         if (zip_ops->output_len < result_ptr->s.totalbyteswritten) {
 190                 /* Dynamic stop && strm->output_len < zipconstants[onfsize] */
 191                 zip_err("output_len (%d) < total bytes written(%d)\n",
 192                         zip_ops->output_len, result_ptr->s.totalbyteswritten);
 193                 zip_ops->output_len = 0;
 194
 195         } else {
 196                 zip_ops->output_len = result_ptr->s.totalbyteswritten;
 197         }
 198
 199         return 0;
 200 }