| /* |
| * 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" |
| |
| struct spufs_ctx_info { |
| struct list_head list; |
| int dfd; |
| int memsize; /* in bytes */ |
| struct spu_context *ctx; |
| }; |
| |
| static LIST_HEAD(ctx_info_list); |
| |
| 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 void spufs_fill_memsize(struct spufs_ctx_info *ctx_info) |
| { |
| struct spu_context *ctx; |
| unsigned long long lslr; |
| |
| ctx = ctx_info->ctx; |
| lslr = ctx->csa.priv2.spu_lslr_RW; |
| ctx_info->memsize = lslr + 1; |
| } |
| |
| static int spufs_ctx_note_size(struct spufs_ctx_info *ctx_info) |
| { |
| int dfd, memsize, i, sz, total = 0; |
| char *name; |
| char fullname[80]; |
| |
| dfd = ctx_info->dfd; |
| memsize = ctx_info->memsize; |
| |
| 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(memsize, 4); |
| else |
| total += roundup(sz, 4); |
| } |
| |
| return total; |
| } |
| |
| static int spufs_add_one_context(struct file *file, int dfd) |
| { |
| struct spu_context *ctx; |
| struct spufs_ctx_info *ctx_info; |
| int size; |
| |
| ctx = SPUFS_I(file->f_dentry->d_inode)->i_ctx; |
| if (ctx->flags & SPU_CREATE_NOSCHED) |
| return 0; |
| |
| ctx_info = kzalloc(sizeof(*ctx_info), GFP_KERNEL); |
| if (unlikely(!ctx_info)) |
| return -ENOMEM; |
| |
| ctx_info->dfd = dfd; |
| ctx_info->ctx = ctx; |
| |
| spufs_fill_memsize(ctx_info); |
| |
| size = spufs_ctx_note_size(ctx_info); |
| list_add(&ctx_info->list, &ctx_info_list); |
| return size; |
| } |
| |
| /* |
| * 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 int spufs_arch_notes_size(void) |
| { |
| struct fdtable *fdt = files_fdtable(current->files); |
| int size = 0, fd; |
| |
| for (fd = 0; fd < fdt->max_fds; fd++) { |
| if (FD_ISSET(fd, fdt->open_fds)) { |
| struct file *file = fcheck(fd); |
| |
| if (file && file->f_op == &spufs_context_fops) { |
| int rval = spufs_add_one_context(file, fd); |
| if (rval < 0) |
| break; |
| size += rval; |
| } |
| } |
| } |
| |
| return size; |
| } |
| |
| static void spufs_arch_write_note(struct spufs_ctx_info *ctx_info, int i, |
| struct file *file) |
| { |
| struct spu_context *ctx; |
| loff_t pos = 0; |
| int sz, dfd, 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; |
| |
| dfd = ctx_info->dfd; |
| name = spufs_coredump_read[i].name; |
| |
| if (!strcmp(name, "mem")) |
| sz = ctx_info->memsize; |
| else |
| sz = spufs_coredump_read[i].size; |
| |
| ctx = ctx_info->ctx; |
| if (!ctx) |
| goto out; |
| |
| 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) |
| { |
| int j; |
| struct spufs_ctx_info *ctx_info, *next; |
| |
| list_for_each_entry_safe(ctx_info, next, &ctx_info_list, list) { |
| spu_acquire_saved(ctx_info->ctx); |
| for (j = 0; j < spufs_coredump_num_notes; j++) |
| spufs_arch_write_note(ctx_info, j, file); |
| spu_release(ctx_info->ctx); |
| list_del(&ctx_info->list); |
| kfree(ctx_info); |
| } |
| } |
| |
| struct spu_coredump_calls spufs_coredump_calls = { |
| .arch_notes_size = spufs_arch_notes_size, |
| .arch_write_notes = spufs_arch_write_notes, |
| .owner = THIS_MODULE, |
| }; |