4 * (C) Copyright 2006 IBM Corp.
6 * Author: Dwayne Grant McConnell <decimal@us.ibm.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include <linux/elf.h>
24 #include <linux/file.h>
26 #include <linux/list.h>
27 #include <linux/module.h>
28 #include <linux/syscalls.h>
30 #include <asm/uaccess.h>
34 struct spufs_ctx_info {
35 struct list_head list;
37 int memsize; /* in bytes */
38 struct spu_context *ctx;
41 static LIST_HEAD(ctx_info_list);
43 static ssize_t do_coredump_read(int num, struct spu_context *ctx, void __user *buffer,
44 size_t size, loff_t *off)
49 if (spufs_coredump_read[num].read)
50 return spufs_coredump_read[num].read(ctx, buffer, size, off);
52 data = spufs_coredump_read[num].get(ctx);
53 ret = copy_to_user(buffer, &data, 8);
54 return ret ? -EFAULT : 8;
58 * These are the only things you should do on a core-file: use only these
59 * functions to write out all the necessary info.
61 static int spufs_dump_write(struct file *file, const void *addr, int nr)
63 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
66 static int spufs_dump_seek(struct file *file, loff_t off)
68 if (file->f_op->llseek) {
69 if (file->f_op->llseek(file, off, 0) != off)
76 static void spufs_fill_memsize(struct spufs_ctx_info *ctx_info)
78 struct spu_context *ctx;
79 unsigned long long lslr;
82 lslr = ctx->csa.priv2.spu_lslr_RW;
83 ctx_info->memsize = lslr + 1;
86 static int spufs_ctx_note_size(struct spufs_ctx_info *ctx_info)
88 int dfd, memsize, i, sz, total = 0;
93 memsize = ctx_info->memsize;
95 for (i = 0; spufs_coredump_read[i].name; i++) {
96 name = spufs_coredump_read[i].name;
97 sz = spufs_coredump_read[i].size;
99 sprintf(fullname, "SPU/%d/%s", dfd, name);
101 total += sizeof(struct elf_note);
102 total += roundup(strlen(fullname) + 1, 4);
103 if (!strcmp(name, "mem"))
104 total += roundup(memsize, 4);
106 total += roundup(sz, 4);
112 static int spufs_add_one_context(struct spu_context *ctx, int dfd)
114 struct spufs_ctx_info *ctx_info;
117 ctx_info = kzalloc(sizeof(*ctx_info), GFP_KERNEL);
118 if (unlikely(!ctx_info))
124 spufs_fill_memsize(ctx_info);
126 size = spufs_ctx_note_size(ctx_info);
127 list_add(&ctx_info->list, &ctx_info_list);
132 * The additional architecture-specific notes for Cell are various
133 * context files in the spu context.
135 * This function iterates over all open file descriptors and sees
136 * if they are a directory in spufs. In that case we use spufs
137 * internal functionality to dump them without needing to actually
140 static struct spu_context *coredump_next_context(int *fd)
142 struct fdtable *fdt = files_fdtable(current->files);
144 struct spu_context *ctx = NULL;
146 for (; *fd < fdt->max_fds; (*fd)++) {
147 if (!FD_ISSET(*fd, fdt->open_fds))
152 if (!file || file->f_op != &spufs_context_fops)
155 ctx = SPUFS_I(file->f_dentry->d_inode)->i_ctx;
156 if (ctx->flags & SPU_CREATE_NOSCHED)
159 /* start searching the next fd next time we're called */
167 static int spufs_arch_notes_size(void)
169 struct spu_context *ctx;
170 int size = 0, rc, fd;
173 while ((ctx = coredump_next_context(&fd)) != NULL) {
174 rc = spufs_add_one_context(ctx, fd);
184 static void spufs_arch_write_note(struct spufs_ctx_info *ctx_info, int i,
187 struct spu_context *ctx;
189 int sz, dfd, rc, total = 0;
190 const int bufsz = PAGE_SIZE;
192 char fullname[80], *buf;
195 buf = (void *)get_zeroed_page(GFP_KERNEL);
200 name = spufs_coredump_read[i].name;
202 if (!strcmp(name, "mem"))
203 sz = ctx_info->memsize;
205 sz = spufs_coredump_read[i].size;
211 sprintf(fullname, "SPU/%d/%s", dfd, name);
212 en.n_namesz = strlen(fullname) + 1;
216 if (!spufs_dump_write(file, &en, sizeof(en)))
218 if (!spufs_dump_write(file, fullname, en.n_namesz))
220 if (!spufs_dump_seek(file, roundup((unsigned long)file->f_pos, 4)))
224 rc = do_coredump_read(i, ctx, buf, bufsz, &pos);
226 if (!spufs_dump_write(file, buf, rc))
230 } while (rc == bufsz && total < sz);
232 spufs_dump_seek(file, roundup((unsigned long)file->f_pos
235 free_page((unsigned long)buf);
238 static void spufs_arch_write_notes(struct file *file)
241 struct spufs_ctx_info *ctx_info, *next;
243 list_for_each_entry_safe(ctx_info, next, &ctx_info_list, list) {
244 spu_acquire_saved(ctx_info->ctx);
245 for (j = 0; j < spufs_coredump_num_notes; j++)
246 spufs_arch_write_note(ctx_info, j, file);
247 spu_release_saved(ctx_info->ctx);
248 list_del(&ctx_info->list);
253 struct spu_coredump_calls spufs_coredump_calls = {
254 .arch_notes_size = spufs_arch_notes_size,
255 .arch_write_notes = spufs_arch_write_notes,
256 .owner = THIS_MODULE,