drivers/fmc/fmc-dump.c

   1 /*
   2  * Copyright (C) 2013 CERN (www.cern.ch)
   3  * Author: Alessandro Rubini <rubini@gnudd.com>
   4  *
   5  * Released according to the GNU GPL, version 2 or any later version.
   6  *
   7  * This work is part of the White Rabbit project, a research effort led
   8  * by CERN, the European Institute for Nuclear Research.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/moduleparam.h>
  12 #include <linux/device.h>
  13 #include <linux/fmc.h>
  14 #include <linux/fmc-sdb.h>
  15
  16 static int fmc_must_dump_eeprom;
  17 module_param_named(dump_eeprom, fmc_must_dump_eeprom, int, 0644);
  18 static int fmc_must_dump_sdb;
  19 module_param_named(dump_sdb, fmc_must_dump_sdb, int, 0644);
  20
  21 #define LINELEN 16
  22
  23 /* Dumping 8k takes oh so much: avoid duplicate lines */
  24 static const uint8_t *dump_line(int addr, const uint8_t *line,
  25                                 const uint8_t *prev)
  26 {
  27         int i;
  28
  29         if (!prev || memcmp(line, prev, LINELEN)) {
  30                 pr_info("%04x: ", addr);
  31                 for (i = 0; i < LINELEN; ) {
  32                         printk(KERN_CONT "%02x", line[i]);
  33                         i++;
  34                         printk(i & 3 ? " " : i & (LINELEN - 1) ? "  " : "\n");
  35                 }
  36                 return line;
  37         }
  38         /* repeated line */
  39         if (line == prev + LINELEN)
  40                 pr_info("[...]\n");
  41         return prev;
  42 }
  43
  44 void fmc_dump_eeprom(const struct fmc_device *fmc)
  45 {
  46         const uint8_t *line, *prev;
  47         int i;
  48
  49         if (!fmc_must_dump_eeprom)
  50                 return;
  51
  52         pr_info("FMC: %s (%s), slot %i, device %s\n", dev_name(fmc->hwdev),
  53                 fmc->carrier_name, fmc->slot_id, dev_name(&fmc->dev));
  54         pr_info("FMC: dumping eeprom 0x%x (%i) bytes\n", fmc->eeprom_len,
  55                fmc->eeprom_len);
  56
  57         line = fmc->eeprom;
  58         prev = NULL;
  59         for (i = 0; i < fmc->eeprom_len; i += LINELEN, line += LINELEN)
  60                 prev = dump_line(i, line, prev);
  61 }
  62
  63 void fmc_dump_sdb(const struct fmc_device *fmc)
  64 {
  65         const uint8_t *line, *prev;
  66         int i, len;
  67
  68         if (!fmc->sdb)
  69                 return;
  70         if (!fmc_must_dump_sdb)
  71                 return;
  72
  73         /* If the argument is not-zero, do simple dump (== show) */
  74         if (fmc_must_dump_sdb > 0)
  75                 fmc_show_sdb_tree(fmc);
  76
  77         if (fmc_must_dump_sdb == 1)
  78                 return;
  79
  80         /* If bigger than 1, dump it seriously, to help debugging */
  81
  82         /*
  83          * Here we should really use libsdbfs (which is designed to
  84          * work in kernel space as well) , but it doesn't support
  85          * directories yet, and it requires better intergration (it
  86          * should be used instead of fmc-specific code).
  87          *
  88          * So, lazily, just dump the top-level array
  89          */
  90         pr_info("FMC: %s (%s), slot %i, device %s\n", dev_name(fmc->hwdev),
  91                 fmc->carrier_name, fmc->slot_id, dev_name(&fmc->dev));
  92         pr_info("FMC: poor dump of sdb first level:\n");
  93
  94         len = fmc->sdb->len * sizeof(union sdb_record);
  95         line = (void *)fmc->sdb->record;
  96         prev = NULL;
  97         for (i = 0; i < len; i += LINELEN, line += LINELEN)
  98                 prev = dump_line(i, line, prev);
  99         return;
 100 }