hw: convert virtio-input-hid device to keycodemapdb
[qemu/ar7.git] / block / throttle.c
blob833175ac77e0bed77efe96a0b06e60fa3be87264
1 /*
2 * QEMU block throttling filter driver infrastructure
4 * Copyright (c) 2017 Manos Pitsidianakis
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 or
9 * (at your option) version 3 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
20 #include "qemu/osdep.h"
21 #include "block/throttle-groups.h"
22 #include "qemu/throttle-options.h"
23 #include "qapi/error.h"
25 static QemuOptsList throttle_opts = {
26 .name = "throttle",
27 .head = QTAILQ_HEAD_INITIALIZER(throttle_opts.head),
28 .desc = {
30 .name = QEMU_OPT_THROTTLE_GROUP_NAME,
31 .type = QEMU_OPT_STRING,
32 .help = "Name of the throttle group",
34 { /* end of list */ }
38 static int throttle_configure_tgm(BlockDriverState *bs,
39 ThrottleGroupMember *tgm,
40 QDict *options, Error **errp)
42 int ret;
43 const char *group_name;
44 Error *local_err = NULL;
45 QemuOpts *opts = qemu_opts_create(&throttle_opts, NULL, 0, &error_abort);
47 qemu_opts_absorb_qdict(opts, options, &local_err);
48 if (local_err) {
49 error_propagate(errp, local_err);
50 ret = -EINVAL;
51 goto fin;
54 group_name = qemu_opt_get(opts, QEMU_OPT_THROTTLE_GROUP_NAME);
55 if (!group_name) {
56 error_setg(errp, "Please specify a throttle group");
57 ret = -EINVAL;
58 goto fin;
59 } else if (!throttle_group_exists(group_name)) {
60 error_setg(errp, "Throttle group '%s' does not exist", group_name);
61 ret = -EINVAL;
62 goto fin;
65 /* Register membership to group with name group_name */
66 throttle_group_register_tgm(tgm, group_name, bdrv_get_aio_context(bs));
67 ret = 0;
68 fin:
69 qemu_opts_del(opts);
70 return ret;
73 static int throttle_open(BlockDriverState *bs, QDict *options,
74 int flags, Error **errp)
76 ThrottleGroupMember *tgm = bs->opaque;
78 bs->file = bdrv_open_child(NULL, options, "file", bs,
79 &child_file, false, errp);
80 if (!bs->file) {
81 return -EINVAL;
83 bs->supported_write_flags = bs->file->bs->supported_write_flags;
84 bs->supported_zero_flags = bs->file->bs->supported_zero_flags;
86 return throttle_configure_tgm(bs, tgm, options, errp);
89 static void throttle_close(BlockDriverState *bs)
91 ThrottleGroupMember *tgm = bs->opaque;
92 throttle_group_unregister_tgm(tgm);
96 static int64_t throttle_getlength(BlockDriverState *bs)
98 return bdrv_getlength(bs->file->bs);
101 static int coroutine_fn throttle_co_preadv(BlockDriverState *bs,
102 uint64_t offset, uint64_t bytes,
103 QEMUIOVector *qiov, int flags)
106 ThrottleGroupMember *tgm = bs->opaque;
107 throttle_group_co_io_limits_intercept(tgm, bytes, false);
109 return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
112 static int coroutine_fn throttle_co_pwritev(BlockDriverState *bs,
113 uint64_t offset, uint64_t bytes,
114 QEMUIOVector *qiov, int flags)
116 ThrottleGroupMember *tgm = bs->opaque;
117 throttle_group_co_io_limits_intercept(tgm, bytes, true);
119 return bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags);
122 static int coroutine_fn throttle_co_pwrite_zeroes(BlockDriverState *bs,
123 int64_t offset, int bytes,
124 BdrvRequestFlags flags)
126 ThrottleGroupMember *tgm = bs->opaque;
127 throttle_group_co_io_limits_intercept(tgm, bytes, true);
129 return bdrv_co_pwrite_zeroes(bs->file, offset, bytes, flags);
132 static int coroutine_fn throttle_co_pdiscard(BlockDriverState *bs,
133 int64_t offset, int bytes)
135 ThrottleGroupMember *tgm = bs->opaque;
136 throttle_group_co_io_limits_intercept(tgm, bytes, true);
138 return bdrv_co_pdiscard(bs->file->bs, offset, bytes);
141 static int throttle_co_flush(BlockDriverState *bs)
143 return bdrv_co_flush(bs->file->bs);
146 static void throttle_detach_aio_context(BlockDriverState *bs)
148 ThrottleGroupMember *tgm = bs->opaque;
149 throttle_group_detach_aio_context(tgm);
152 static void throttle_attach_aio_context(BlockDriverState *bs,
153 AioContext *new_context)
155 ThrottleGroupMember *tgm = bs->opaque;
156 throttle_group_attach_aio_context(tgm, new_context);
159 static int throttle_reopen_prepare(BDRVReopenState *reopen_state,
160 BlockReopenQueue *queue, Error **errp)
162 ThrottleGroupMember *tgm;
164 assert(reopen_state != NULL);
165 assert(reopen_state->bs != NULL);
167 reopen_state->opaque = g_new0(ThrottleGroupMember, 1);
168 tgm = reopen_state->opaque;
170 return throttle_configure_tgm(reopen_state->bs, tgm, reopen_state->options,
171 errp);
174 static void throttle_reopen_commit(BDRVReopenState *reopen_state)
176 ThrottleGroupMember *old_tgm = reopen_state->bs->opaque;
177 ThrottleGroupMember *new_tgm = reopen_state->opaque;
179 throttle_group_unregister_tgm(old_tgm);
180 g_free(old_tgm);
181 reopen_state->bs->opaque = new_tgm;
182 reopen_state->opaque = NULL;
185 static void throttle_reopen_abort(BDRVReopenState *reopen_state)
187 ThrottleGroupMember *tgm = reopen_state->opaque;
189 throttle_group_unregister_tgm(tgm);
190 g_free(tgm);
191 reopen_state->opaque = NULL;
194 static bool throttle_recurse_is_first_non_filter(BlockDriverState *bs,
195 BlockDriverState *candidate)
197 return bdrv_recurse_is_first_non_filter(bs->file->bs, candidate);
200 static void coroutine_fn throttle_co_drain_begin(BlockDriverState *bs)
202 ThrottleGroupMember *tgm = bs->opaque;
203 if (atomic_fetch_inc(&tgm->io_limits_disabled) == 0) {
204 throttle_group_restart_tgm(tgm);
208 static void coroutine_fn throttle_co_drain_end(BlockDriverState *bs)
210 ThrottleGroupMember *tgm = bs->opaque;
211 assert(tgm->io_limits_disabled);
212 atomic_dec(&tgm->io_limits_disabled);
215 static BlockDriver bdrv_throttle = {
216 .format_name = "throttle",
217 .protocol_name = "throttle",
218 .instance_size = sizeof(ThrottleGroupMember),
220 .bdrv_file_open = throttle_open,
221 .bdrv_close = throttle_close,
222 .bdrv_co_flush = throttle_co_flush,
224 .bdrv_child_perm = bdrv_filter_default_perms,
226 .bdrv_getlength = throttle_getlength,
228 .bdrv_co_preadv = throttle_co_preadv,
229 .bdrv_co_pwritev = throttle_co_pwritev,
231 .bdrv_co_pwrite_zeroes = throttle_co_pwrite_zeroes,
232 .bdrv_co_pdiscard = throttle_co_pdiscard,
234 .bdrv_recurse_is_first_non_filter = throttle_recurse_is_first_non_filter,
236 .bdrv_attach_aio_context = throttle_attach_aio_context,
237 .bdrv_detach_aio_context = throttle_detach_aio_context,
239 .bdrv_reopen_prepare = throttle_reopen_prepare,
240 .bdrv_reopen_commit = throttle_reopen_commit,
241 .bdrv_reopen_abort = throttle_reopen_abort,
242 .bdrv_co_get_block_status = bdrv_co_get_block_status_from_file,
244 .bdrv_co_drain_begin = throttle_co_drain_begin,
245 .bdrv_co_drain_end = throttle_co_drain_end,
247 .is_filter = true,
250 static void bdrv_throttle_init(void)
252 bdrv_register(&bdrv_throttle);
255 block_init(bdrv_throttle_init);