linux/arch/blackfin/kernel/cplbinfo.c
Mike Frysinger 48dee09325 Blackfin: cplbinfo: drop d_path() hacks
The cplbinfo was using d_path() to figure out which cpu/cplb was being
parsed.  As Al pointed out, this isn't exactly reliable as it assumes the
static VFS path to be unchanged, and it's just poor form.  So use the
proc_create_data() to properly (and internally) pass the exact cpu/cplb
requested to the parser function.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-10-07 04:48:04 -04:00

178 lines
3.8 KiB
C

/*
* arch/blackfin/kernel/cplbinfo.c - display CPLB status
*
* Copyright 2004-2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <asm/cplbinit.h>
#include <asm/blackfin.h>
static char const page_strtbl[][3] = { "1K", "4K", "1M", "4M" };
#define page(flags) (((flags) & 0x30000) >> 16)
#define strpage(flags) page_strtbl[page(flags)]
struct cplbinfo_data {
loff_t pos;
char cplb_type;
u32 mem_control;
struct cplb_entry *tbl;
int switched;
};
static void cplbinfo_print_header(struct seq_file *m)
{
seq_printf(m, "Index\tAddress\t\tData\tSize\tU/RD\tU/WR\tS/WR\tSwitch\n");
}
static int cplbinfo_nomore(struct cplbinfo_data *cdata)
{
return cdata->pos >= MAX_CPLBS;
}
static int cplbinfo_show(struct seq_file *m, void *p)
{
struct cplbinfo_data *cdata;
unsigned long data, addr;
loff_t pos;
cdata = p;
pos = cdata->pos;
addr = cdata->tbl[pos].addr;
data = cdata->tbl[pos].data;
seq_printf(m,
"%d\t0x%08lx\t%05lx\t%s\t%c\t%c\t%c\t%c\n",
(int)pos, addr, data, strpage(data),
(data & CPLB_USER_RD) ? 'Y' : 'N',
(data & CPLB_USER_WR) ? 'Y' : 'N',
(data & CPLB_SUPV_WR) ? 'Y' : 'N',
pos < cdata->switched ? 'N' : 'Y');
return 0;
}
static void cplbinfo_seq_init(struct cplbinfo_data *cdata, unsigned int cpu)
{
if (cdata->cplb_type == 'I') {
cdata->mem_control = bfin_read_IMEM_CONTROL();
cdata->tbl = icplb_tbl[cpu];
cdata->switched = first_switched_icplb;
} else {
cdata->mem_control = bfin_read_DMEM_CONTROL();
cdata->tbl = dcplb_tbl[cpu];
cdata->switched = first_switched_dcplb;
}
}
static void *cplbinfo_start(struct seq_file *m, loff_t *pos)
{
struct cplbinfo_data *cdata = m->private;
if (!*pos) {
seq_printf(m, "%cCPLBs are %sabled: 0x%x\n", cdata->cplb_type,
(cdata->mem_control & ENDCPLB ? "en" : "dis"),
cdata->mem_control);
cplbinfo_print_header(m);
} else if (cplbinfo_nomore(cdata))
return NULL;
get_cpu();
return cdata;
}
static void *cplbinfo_next(struct seq_file *m, void *p, loff_t *pos)
{
struct cplbinfo_data *cdata = p;
cdata->pos = ++(*pos);
if (cplbinfo_nomore(cdata))
return NULL;
else
return cdata;
}
static void cplbinfo_stop(struct seq_file *m, void *p)
{
put_cpu();
}
static const struct seq_operations cplbinfo_sops = {
.start = cplbinfo_start,
.next = cplbinfo_next,
.stop = cplbinfo_stop,
.show = cplbinfo_show,
};
#define CPLBINFO_DCPLB_FLAG 0x80000000
static int cplbinfo_open(struct inode *inode, struct file *file)
{
struct proc_dir_entry *pde = PDE(file->f_path.dentry->d_inode);
char cplb_type;
unsigned int cpu;
int ret;
struct seq_file *m;
struct cplbinfo_data *cdata;
cpu = (unsigned int)pde->data;
cplb_type = cpu & CPLBINFO_DCPLB_FLAG ? 'D' : 'I';
cpu &= ~CPLBINFO_DCPLB_FLAG;
if (!cpu_online(cpu))
return -ENODEV;
ret = seq_open_private(file, &cplbinfo_sops, sizeof(*cdata));
if (ret)
return ret;
m = file->private_data;
cdata = m->private;
cdata->pos = 0;
cdata->cplb_type = cplb_type;
cplbinfo_seq_init(cdata, cpu);
return 0;
}
static const struct file_operations cplbinfo_fops = {
.open = cplbinfo_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
static int __init cplbinfo_init(void)
{
struct proc_dir_entry *cplb_dir, *cpu_dir;
char buf[10];
unsigned int cpu;
cplb_dir = proc_mkdir("cplbinfo", NULL);
if (!cplb_dir)
return -ENOMEM;
for_each_possible_cpu(cpu) {
sprintf(buf, "cpu%i", cpu);
cpu_dir = proc_mkdir(buf, cplb_dir);
if (!cpu_dir)
return -ENOMEM;
proc_create_data("icplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
(void *)cpu);
proc_create_data("dcplb", S_IRUGO, cpu_dir, &cplbinfo_fops,
(void *)(cpu | CPLBINFO_DCPLB_FLAG));
}
return 0;
}
late_initcall(cplbinfo_init);