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/*
* SPU core dump code
*
* (C) Copyright 2006 IBM Corp.
*
* Author: Dwayne Grant McConnell <decimal@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/elf.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/syscalls.h>
#include <asm/uaccess.h>
#include "spufs.h"
static ssize_t do_coredump_read(int num, struct spu_context *ctx, void __user *buffer,
size_t size, loff_t *off)
{
u64 data;
int ret;
if (spufs_coredump_read[num].read)
return spufs_coredump_read[num].read(ctx, buffer, size, off);
data = spufs_coredump_read[num].get(ctx);
ret = copy_to_user(buffer, &data, 8);
return ret ? -EFAULT : 8;
}
/*
* These are the only things you should do on a core-file: use only these
* functions to write out all the necessary info.
*/
static int spufs_dump_write(struct file *file, const void *addr, int nr)
{
return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
}
static int spufs_dump_seek(struct file *file, loff_t off)
{
if (file->f_op->llseek) {
if (file->f_op->llseek(file, off, 0) != off)
return 0;
} else
file->f_pos = off;
return 1;
}
static u64 ctx_ls_size(struct spu_context *ctx)
{
return ctx->csa.priv2.spu_lslr_RW + 1;
}
static int spufs_ctx_note_size(struct spu_context *ctx, int dfd)
{
int i, sz, total = 0;
char *name;
char fullname[80];
for (i = 0; spufs_coredump_read[i].name; i++) {
name = spufs_coredump_read[i].name;
sz = spufs_coredump_read[i].size;
sprintf(fullname, "SPU/%d/%s", dfd, name);
total += sizeof(struct elf_note);
total += roundup(strlen(fullname) + 1, 4);
if (!strcmp(name, "mem"))
total += roundup(ctx_ls_size(ctx), 4);
else
total += roundup(sz, 4);
}
return total;
}
/*
* The additional architecture-specific notes for Cell are various
* context files in the spu context.
*
* This function iterates over all open file descriptors and sees
* if they are a directory in spufs. In that case we use spufs
* internal functionality to dump them without needing to actually
* open the files.
*/
static struct spu_context *coredump_next_context(int *fd)
{
struct fdtable *fdt = files_fdtable(current->files);
struct file *file;
struct spu_context *ctx = NULL;
for (; *fd < fdt->max_fds; (*fd)++) {
if (!FD_ISSET(*fd, fdt->open_fds))
continue;
file = fcheck(*fd);
if (!file || file->f_op != &spufs_context_fops)
continue;
ctx = SPUFS_I(file->f_dentry->d_inode)->i_ctx;
if (ctx->flags & SPU_CREATE_NOSCHED)
continue;
/* start searching the next fd next time we're called */
(*fd)++;
break;
}
return ctx;
}
static int spufs_arch_notes_size(void)
{
struct spu_context *ctx;
int size = 0, rc, fd;
fd = 0;
while ((ctx = coredump_next_context(&fd)) != NULL) {
spu_acquire_saved(ctx);
rc = spufs_ctx_note_size(ctx, fd);
spu_release_saved(ctx);
if (rc < 0)
break;
size += rc;
}
return size;
}
static void spufs_arch_write_note(struct spu_context *ctx, int i,
struct file *file, int dfd)
{
loff_t pos = 0;
int sz, rc, total = 0;
const int bufsz = PAGE_SIZE;
char *name;
char fullname[80], *buf;
struct elf_note en;
buf = (void *)get_zeroed_page(GFP_KERNEL);
if (!buf)
return;
name = spufs_coredump_read[i].name;
if (!strcmp(name, "mem"))
sz = ctx_ls_size(ctx);
else
sz = spufs_coredump_read[i].size;
sprintf(fullname, "SPU/%d/%s", dfd, name);
en.n_namesz = strlen(fullname) + 1;
en.n_descsz = sz;
en.n_type = NT_SPU;
if (!spufs_dump_write(file, &en, sizeof(en)))
goto out;
if (!spufs_dump_write(file, fullname, en.n_namesz))
goto out;
if (!spufs_dump_seek(file, roundup((unsigned long)file->f_pos, 4)))
goto out;
do {
rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
if (rc > 0) {
if (!spufs_dump_write(file, buf, rc))
goto out;
total += rc;
}
} while (rc == bufsz && total < sz);
spufs_dump_seek(file, roundup((unsigned long)file->f_pos
- total + sz, 4));
out:
free_page((unsigned long)buf);
}
static void spufs_arch_write_notes(struct file *file)
{
struct spu_context *ctx;
int fd, j;
fd = 0;
while ((ctx = coredump_next_context(&fd)) != NULL) {
spu_acquire_saved(ctx);
for (j = 0; j < spufs_coredump_num_notes; j++)
spufs_arch_write_note(ctx, j, file, fd);
spu_release_saved(ctx);
}
}
struct spu_coredump_calls spufs_coredump_calls = {
.arch_notes_size = spufs_arch_notes_size,
.arch_write_notes = spufs_arch_write_notes,
.owner = THIS_MODULE,
};
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