Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 1 | /* |
| 2 | * SPU core dump code |
| 3 | * |
| 4 | * (C) Copyright 2006 IBM Corp. |
| 5 | * |
| 6 | * Author: Dwayne Grant McConnell <decimal@us.ibm.com> |
| 7 | * |
| 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) |
| 11 | * any later version. |
| 12 | * |
| 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. |
| 17 | * |
| 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. |
| 21 | */ |
| 22 | |
| 23 | #include <linux/elf.h> |
| 24 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 25 | #include <linux/fdtable.h> |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 26 | #include <linux/fs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/gfp.h> |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 28 | #include <linux/list.h> |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 29 | #include <linux/syscalls.h> |
Al Viro | cdc3d56 | 2013-10-05 22:24:29 -0400 | [diff] [blame] | 30 | #include <linux/coredump.h> |
| 31 | #include <linux/binfmts.h> |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 32 | |
| 33 | #include <asm/uaccess.h> |
| 34 | |
| 35 | #include "spufs.h" |
| 36 | |
Michael Ellerman | d464fb4 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 37 | static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer, |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 38 | size_t size, loff_t *off) |
| 39 | { |
| 40 | u64 data; |
| 41 | int ret; |
| 42 | |
| 43 | if (spufs_coredump_read[num].read) |
| 44 | return spufs_coredump_read[num].read(ctx, buffer, size, off); |
| 45 | |
| 46 | data = spufs_coredump_read[num].get(ctx); |
Stephen Rothwell | 9477e45 | 2009-01-06 14:27:38 +0000 | [diff] [blame] | 47 | ret = snprintf(buffer, size, "0x%.16llx", data); |
Michael Ellerman | d464fb4 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 48 | if (ret >= size) |
| 49 | return size; |
| 50 | return ++ret; /* count trailing NULL */ |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 51 | } |
| 52 | |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 53 | static int spufs_ctx_note_size(struct spu_context *ctx, int dfd) |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 54 | { |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 55 | int i, sz, total = 0; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 56 | char *name; |
| 57 | char fullname[80]; |
| 58 | |
Michael Ellerman | 936d5bf | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 59 | for (i = 0; spufs_coredump_read[i].name != NULL; i++) { |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 60 | name = spufs_coredump_read[i].name; |
| 61 | sz = spufs_coredump_read[i].size; |
| 62 | |
| 63 | sprintf(fullname, "SPU/%d/%s", dfd, name); |
| 64 | |
| 65 | total += sizeof(struct elf_note); |
| 66 | total += roundup(strlen(fullname) + 1, 4); |
Michael Ellerman | 59000b5 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 67 | total += roundup(sz, 4); |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 68 | } |
| 69 | |
| 70 | return total; |
| 71 | } |
| 72 | |
Al Viro | 2be7fd5 | 2012-08-21 22:50:49 -0400 | [diff] [blame] | 73 | static int match_context(const void *v, struct file *file, unsigned fd) |
| 74 | { |
| 75 | struct spu_context *ctx; |
| 76 | if (file->f_op != &spufs_context_fops) |
| 77 | return 0; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 78 | ctx = SPUFS_I(file_inode(file))->i_ctx; |
Al Viro | 2be7fd5 | 2012-08-21 22:50:49 -0400 | [diff] [blame] | 79 | if (ctx->flags & SPU_CREATE_NOSCHED) |
| 80 | return 0; |
| 81 | return fd + 1; |
| 82 | } |
| 83 | |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 84 | /* |
| 85 | * The additional architecture-specific notes for Cell are various |
| 86 | * context files in the spu context. |
| 87 | * |
| 88 | * This function iterates over all open file descriptors and sees |
| 89 | * if they are a directory in spufs. In that case we use spufs |
| 90 | * internal functionality to dump them without needing to actually |
| 91 | * open the files. |
| 92 | */ |
Al Viro | 2be7fd5 | 2012-08-21 22:50:49 -0400 | [diff] [blame] | 93 | /* |
| 94 | * descriptor table is not shared, so files can't change or go away. |
| 95 | */ |
Michael Ellerman | a595ed6 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 96 | static struct spu_context *coredump_next_context(int *fd) |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 97 | { |
Michael Ellerman | a595ed6 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 98 | struct file *file; |
Al Viro | 2be7fd5 | 2012-08-21 22:50:49 -0400 | [diff] [blame] | 99 | int n = iterate_fd(current->files, *fd, match_context, NULL); |
| 100 | if (!n) |
| 101 | return NULL; |
| 102 | *fd = n - 1; |
| 103 | file = fcheck(*fd); |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 104 | return SPUFS_I(file_inode(file))->i_ctx; |
Michael Ellerman | a595ed6 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 105 | } |
| 106 | |
Michael Ellerman | 48cad41 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 107 | int spufs_coredump_extra_notes_size(void) |
Michael Ellerman | a595ed6 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 108 | { |
| 109 | struct spu_context *ctx; |
| 110 | int size = 0, rc, fd; |
| 111 | |
| 112 | fd = 0; |
| 113 | while ((ctx = coredump_next_context(&fd)) != NULL) { |
Christoph Hellwig | c9101bd | 2007-12-20 16:39:59 +0900 | [diff] [blame] | 114 | rc = spu_acquire_saved(ctx); |
| 115 | if (rc) |
| 116 | break; |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 117 | rc = spufs_ctx_note_size(ctx, fd); |
Michael Ellerman | 9a5080f | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 118 | spu_release_saved(ctx); |
Michael Ellerman | a595ed6 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 119 | if (rc < 0) |
| 120 | break; |
| 121 | |
| 122 | size += rc; |
Gerhard Stenzel | ada397e | 2008-03-28 14:18:30 +1100 | [diff] [blame] | 123 | |
| 124 | /* start searching the next fd next time */ |
| 125 | fd++; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | return size; |
| 129 | } |
| 130 | |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 131 | static int spufs_arch_write_note(struct spu_context *ctx, int i, |
Al Viro | cdc3d56 | 2013-10-05 22:24:29 -0400 | [diff] [blame] | 132 | struct coredump_params *cprm, int dfd) |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 133 | { |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 134 | loff_t pos = 0; |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 135 | int sz, rc, total = 0; |
Arnd Bergmann | 6cf2179 | 2007-04-23 21:08:25 +0200 | [diff] [blame] | 136 | const int bufsz = PAGE_SIZE; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 137 | char *name; |
| 138 | char fullname[80], *buf; |
| 139 | struct elf_note en; |
| 140 | |
Arnd Bergmann | 6cf2179 | 2007-04-23 21:08:25 +0200 | [diff] [blame] | 141 | buf = (void *)get_zeroed_page(GFP_KERNEL); |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 142 | if (!buf) |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 143 | return -ENOMEM; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 144 | |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 145 | name = spufs_coredump_read[i].name; |
Michael Ellerman | 59000b5 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 146 | sz = spufs_coredump_read[i].size; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 147 | |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 148 | sprintf(fullname, "SPU/%d/%s", dfd, name); |
| 149 | en.n_namesz = strlen(fullname) + 1; |
| 150 | en.n_descsz = sz; |
| 151 | en.n_type = NT_SPU; |
| 152 | |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 153 | if (!dump_emit(cprm, &en, sizeof(en))) |
| 154 | goto Eio; |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 155 | |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 156 | if (!dump_emit(cprm, fullname, en.n_namesz)) |
| 157 | goto Eio; |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 158 | |
Al Viro | 22a8cb8 | 2013-10-08 11:05:01 -0400 | [diff] [blame] | 159 | if (!dump_align(cprm, 4)) |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 160 | goto Eio; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 161 | |
| 162 | do { |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 163 | rc = do_coredump_read(i, ctx, buf, bufsz, &pos); |
| 164 | if (rc > 0) { |
| 165 | if (!dump_emit(cprm, buf, rc)) |
| 166 | goto Eio; |
| 167 | total += rc; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 168 | } |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 169 | } while (rc == bufsz && total < sz); |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 170 | |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 171 | if (rc < 0) |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 172 | goto out; |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 173 | |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 174 | if (!dump_skip(cprm, |
| 175 | roundup(cprm->written - total + sz, 4) - cprm->written)) |
| 176 | goto Eio; |
Arnd Bergmann | 6cf2179 | 2007-04-23 21:08:25 +0200 | [diff] [blame] | 177 | out: |
| 178 | free_page((unsigned long)buf); |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 179 | return rc; |
Al Viro | 7b1f402 | 2013-10-08 09:44:29 -0400 | [diff] [blame] | 180 | Eio: |
| 181 | free_page((unsigned long)buf); |
| 182 | return -EIO; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 183 | } |
| 184 | |
Al Viro | cdc3d56 | 2013-10-05 22:24:29 -0400 | [diff] [blame] | 185 | int spufs_coredump_extra_notes_write(struct coredump_params *cprm) |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 186 | { |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 187 | struct spu_context *ctx; |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 188 | int fd, j, rc; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 189 | |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 190 | fd = 0; |
| 191 | while ((ctx = coredump_next_context(&fd)) != NULL) { |
Christoph Hellwig | c9101bd | 2007-12-20 16:39:59 +0900 | [diff] [blame] | 192 | rc = spu_acquire_saved(ctx); |
| 193 | if (rc) |
| 194 | return rc; |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 195 | |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 196 | for (j = 0; spufs_coredump_read[j].name != NULL; j++) { |
Al Viro | cdc3d56 | 2013-10-05 22:24:29 -0400 | [diff] [blame] | 197 | rc = spufs_arch_write_note(ctx, j, cprm, fd); |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 198 | if (rc) { |
| 199 | spu_release_saved(ctx); |
| 200 | return rc; |
| 201 | } |
| 202 | } |
Michael Ellerman | f9b7bbe | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 203 | |
| 204 | spu_release_saved(ctx); |
Gerhard Stenzel | ada397e | 2008-03-28 14:18:30 +1100 | [diff] [blame] | 205 | |
| 206 | /* start searching the next fd next time */ |
| 207 | fd++; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 208 | } |
Michael Ellerman | 7af1443 | 2007-09-19 14:38:12 +1000 | [diff] [blame] | 209 | |
| 210 | return 0; |
Dwayne Grant McConnell | bf1ab97 | 2006-11-23 00:46:37 +0100 | [diff] [blame] | 211 | } |