Brian King | 32d8ad4 | 2010-07-07 12:31:02 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 Brian King IBM Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/suspend.h> |
| 21 | #include <asm/firmware.h> |
| 22 | #include <asm/hvcall.h> |
| 23 | #include <asm/machdep.h> |
| 24 | #include <asm/mmu.h> |
| 25 | #include <asm/rtas.h> |
| 26 | |
| 27 | static u64 stream_id; |
| 28 | static struct sys_device suspend_sysdev; |
| 29 | static DECLARE_COMPLETION(suspend_work); |
| 30 | static struct rtas_suspend_me_data suspend_data; |
| 31 | static atomic_t suspending; |
| 32 | |
| 33 | /** |
| 34 | * pseries_suspend_begin - First phase of hibernation |
| 35 | * |
| 36 | * Check to ensure we are in a valid state to hibernate |
| 37 | * |
| 38 | * Return value: |
| 39 | * 0 on success / other on failure |
| 40 | **/ |
| 41 | static int pseries_suspend_begin(suspend_state_t state) |
| 42 | { |
| 43 | long vasi_state, rc; |
| 44 | unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; |
| 45 | |
| 46 | /* Make sure the state is valid */ |
| 47 | rc = plpar_hcall(H_VASI_STATE, retbuf, stream_id); |
| 48 | |
| 49 | vasi_state = retbuf[0]; |
| 50 | |
| 51 | if (rc) { |
| 52 | pr_err("pseries_suspend_begin: vasi_state returned %ld\n",rc); |
| 53 | return rc; |
| 54 | } else if (vasi_state == H_VASI_ENABLED) { |
| 55 | return -EAGAIN; |
| 56 | } else if (vasi_state != H_VASI_SUSPENDING) { |
| 57 | pr_err("pseries_suspend_begin: vasi_state returned state %ld\n", |
| 58 | vasi_state); |
| 59 | return -EIO; |
| 60 | } |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * pseries_suspend_cpu - Suspend a single CPU |
| 67 | * |
| 68 | * Makes the H_JOIN call to suspend the CPU |
| 69 | * |
| 70 | **/ |
| 71 | static int pseries_suspend_cpu(void) |
| 72 | { |
| 73 | if (atomic_read(&suspending)) |
| 74 | return rtas_suspend_cpu(&suspend_data); |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | /** |
| 79 | * pseries_suspend_enter - Final phase of hibernation |
| 80 | * |
| 81 | * Return value: |
| 82 | * 0 on success / other on failure |
| 83 | **/ |
| 84 | static int pseries_suspend_enter(suspend_state_t state) |
| 85 | { |
| 86 | int rc = rtas_suspend_last_cpu(&suspend_data); |
| 87 | |
| 88 | atomic_set(&suspending, 0); |
| 89 | atomic_set(&suspend_data.done, 1); |
| 90 | return rc; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * pseries_prepare_late - Prepare to suspend all other CPUs |
| 95 | * |
| 96 | * Return value: |
| 97 | * 0 on success / other on failure |
| 98 | **/ |
| 99 | static int pseries_prepare_late(void) |
| 100 | { |
| 101 | atomic_set(&suspending, 1); |
| 102 | atomic_set(&suspend_data.working, 0); |
| 103 | atomic_set(&suspend_data.done, 0); |
| 104 | atomic_set(&suspend_data.error, 0); |
| 105 | suspend_data.complete = &suspend_work; |
| 106 | INIT_COMPLETION(suspend_work); |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * store_hibernate - Initiate partition hibernation |
| 112 | * @classdev: sysdev class struct |
| 113 | * @attr: class device attribute struct |
| 114 | * @buf: buffer |
| 115 | * @count: buffer size |
| 116 | * |
| 117 | * Write the stream ID received from the HMC to this file |
| 118 | * to trigger hibernating the partition |
| 119 | * |
| 120 | * Return value: |
| 121 | * number of bytes printed to buffer / other on failure |
| 122 | **/ |
| 123 | static ssize_t store_hibernate(struct sysdev_class *classdev, |
| 124 | struct sysdev_class_attribute *attr, |
| 125 | const char *buf, size_t count) |
| 126 | { |
| 127 | int rc; |
| 128 | |
| 129 | if (!capable(CAP_SYS_ADMIN)) |
| 130 | return -EPERM; |
| 131 | |
| 132 | stream_id = simple_strtoul(buf, NULL, 16); |
| 133 | |
| 134 | do { |
| 135 | rc = pseries_suspend_begin(PM_SUSPEND_MEM); |
| 136 | if (rc == -EAGAIN) |
| 137 | ssleep(1); |
| 138 | } while (rc == -EAGAIN); |
| 139 | |
| 140 | if (!rc) |
| 141 | rc = pm_suspend(PM_SUSPEND_MEM); |
| 142 | |
| 143 | stream_id = 0; |
| 144 | |
| 145 | if (!rc) |
| 146 | rc = count; |
| 147 | return rc; |
| 148 | } |
| 149 | |
| 150 | static SYSDEV_CLASS_ATTR(hibernate, S_IWUSR, NULL, store_hibernate); |
| 151 | |
| 152 | static struct sysdev_class suspend_sysdev_class = { |
| 153 | .name = "power", |
| 154 | }; |
| 155 | |
| 156 | static struct platform_suspend_ops pseries_suspend_ops = { |
| 157 | .valid = suspend_valid_only_mem, |
| 158 | .begin = pseries_suspend_begin, |
| 159 | .prepare_late = pseries_prepare_late, |
| 160 | .enter = pseries_suspend_enter, |
| 161 | }; |
| 162 | |
| 163 | /** |
| 164 | * pseries_suspend_sysfs_register - Register with sysfs |
| 165 | * |
| 166 | * Return value: |
| 167 | * 0 on success / other on failure |
| 168 | **/ |
| 169 | static int pseries_suspend_sysfs_register(struct sys_device *sysdev) |
| 170 | { |
| 171 | int rc; |
| 172 | |
| 173 | if ((rc = sysdev_class_register(&suspend_sysdev_class))) |
| 174 | return rc; |
| 175 | |
| 176 | sysdev->id = 0; |
| 177 | sysdev->cls = &suspend_sysdev_class; |
| 178 | |
| 179 | if ((rc = sysdev_class_create_file(&suspend_sysdev_class, &attr_hibernate))) |
| 180 | goto class_unregister; |
| 181 | |
| 182 | return 0; |
| 183 | |
| 184 | class_unregister: |
| 185 | sysdev_class_unregister(&suspend_sysdev_class); |
| 186 | return rc; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * pseries_suspend_init - initcall for pSeries suspend |
| 191 | * |
| 192 | * Return value: |
| 193 | * 0 on success / other on failure |
| 194 | **/ |
| 195 | static int __init pseries_suspend_init(void) |
| 196 | { |
| 197 | int rc; |
| 198 | |
| 199 | if (!machine_is(pseries) || !firmware_has_feature(FW_FEATURE_LPAR)) |
| 200 | return 0; |
| 201 | |
| 202 | suspend_data.token = rtas_token("ibm,suspend-me"); |
| 203 | if (suspend_data.token == RTAS_UNKNOWN_SERVICE) |
| 204 | return 0; |
| 205 | |
| 206 | if ((rc = pseries_suspend_sysfs_register(&suspend_sysdev))) |
| 207 | return rc; |
| 208 | |
| 209 | ppc_md.suspend_disable_cpu = pseries_suspend_cpu; |
| 210 | suspend_set_ops(&pseries_suspend_ops); |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | __initcall(pseries_suspend_init); |