fmc-debug.c
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/*
* Copyright (C) 2015 CERN (www.cern.ch)
* Author: Federico Vaga <federico.vaga@cern.ch>
*
* Released according to the GNU GPL, version 2 or any later version.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/byteorder.h>
#include <linux/fmc.h>
#include <linux/sdb.h>
#include <linux/fmc-sdb.h>
#define FMC_DBG_SDB_DUMP "dump_sdb"
static char *__strip_trailing_space(char *buf, char *str, int len)
{
int i = len - 1;
memcpy(buf, str, len);
buf[len] = '\0';
while (i >= 0 && buf[i] == ' ')
buf[i--] = '\0';
return buf;
}
#define __sdb_string(buf, field) ({ \
BUILD_BUG_ON(sizeof(buf) < sizeof(field)); \
__strip_trailing_space(buf, (void *)(field), sizeof(field)); \
})
/**
* We do not check seq_printf() errors because we want to see things in any case
*/
static void fmc_sdb_dump_recursive(struct fmc_device *fmc, struct seq_file *s,
const struct sdb_array *arr)
{
unsigned long base = arr->baseaddr;
int i, j, n = arr->len, level = arr->level;
char tmp[64];
for (i = 0; i < n; i++) {
union sdb_record *r;
struct sdb_product *p;
struct sdb_component *c;
r = &arr->record[i];
c = &r->dev.sdb_component;
p = &c->product;
for (j = 0; j < level; j++)
seq_printf(s, " ");
switch (r->empty.record_type) {
case sdb_type_interconnect:
seq_printf(s, "%08llx:%08x %.19s\n",
__be64_to_cpu(p->vendor_id),
__be32_to_cpu(p->device_id),
p->name);
break;
case sdb_type_device:
seq_printf(s, "%08llx:%08x %.19s (%08llx-%08llx)\n",
__be64_to_cpu(p->vendor_id),
__be32_to_cpu(p->device_id),
p->name,
__be64_to_cpu(c->addr_first) + base,
__be64_to_cpu(c->addr_last) + base);
break;
case sdb_type_bridge:
seq_printf(s, "%08llx:%08x %.19s (bridge: %08llx)\n",
__be64_to_cpu(p->vendor_id),
__be32_to_cpu(p->device_id),
p->name,
__be64_to_cpu(c->addr_first) + base);
if (IS_ERR(arr->subtree[i])) {
seq_printf(s, "SDB: (bridge error %li)\n",
PTR_ERR(arr->subtree[i]));
break;
}
fmc_sdb_dump_recursive(fmc, s, arr->subtree[i]);
break;
case sdb_type_integration:
seq_printf(s, "integration\n");
break;
case sdb_type_repo_url:
seq_printf(s, "Synthesis repository: %s\n",
__sdb_string(tmp, r->repo_url.repo_url));
break;
case sdb_type_synthesis:
seq_printf(s, "Bitstream '%s' ",
__sdb_string(tmp, r->synthesis.syn_name));
seq_printf(s, "synthesized %08x by %s ",
__be32_to_cpu(r->synthesis.date),
__sdb_string(tmp, r->synthesis.user_name));
seq_printf(s, "(%s version %x), ",
__sdb_string(tmp, r->synthesis.tool_name),
__be32_to_cpu(r->synthesis.tool_version));
seq_printf(s, "commit %pm\n",
r->synthesis.commit_id);
break;
case sdb_type_empty:
seq_printf(s, "empty\n");
break;
default:
seq_printf(s, "UNKNOWN TYPE 0x%02x\n",
r->empty.record_type);
break;
}
}
}
static int fmc_sdb_dump(struct seq_file *s, void *offset)
{
struct fmc_device *fmc = s->private;
if (!fmc->sdb) {
seq_printf(s, "no SDB information\n");
return 0;
}
seq_printf(s, "FMC: %s (%s), slot %i, device %s\n", dev_name(fmc->hwdev),
fmc->carrier_name, fmc->slot_id, dev_name(&fmc->dev));
/* Dump SDB information */
fmc_sdb_dump_recursive(fmc, s, fmc->sdb);
return 0;
}
static int fmc_sdb_dump_open(struct inode *inode, struct file *file)
{
struct fmc_device *fmc = inode->i_private;
return single_open(file, fmc_sdb_dump, fmc);
}
const struct file_operations fmc_dbgfs_sdb_dump = {
.owner = THIS_MODULE,
.open = fmc_sdb_dump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
int fmc_debug_init(struct fmc_device *fmc)
{
fmc->dbg_dir = debugfs_create_dir(dev_name(&fmc->dev), NULL);
if (IS_ERR_OR_NULL(fmc->dbg_dir)) {
pr_err("FMC: Cannot create debugfs\n");
return PTR_ERR(fmc->dbg_dir);
}
fmc->dbg_sdb_dump = debugfs_create_file(FMC_DBG_SDB_DUMP, 0444,
fmc->dbg_dir, fmc,
&fmc_dbgfs_sdb_dump);
if (IS_ERR_OR_NULL(fmc->dbg_sdb_dump))
pr_err("FMC: Cannot create debugfs file %s\n",
FMC_DBG_SDB_DUMP);
return 0;
}
void fmc_debug_exit(struct fmc_device *fmc)
{
if (fmc->dbg_dir)
debugfs_remove_recursive(fmc->dbg_dir);
}