tests: virtio-9p: rename PCI configuration test
[qemu.git] / block / qed-table.c
1 /*
2 * QEMU Enhanced Disk Format Table I/O
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
8 * Anthony Liguori <aliguori@us.ibm.com>
9 *
10 * This work is licensed under the terms of the GNU LGPL, version 2 or later.
11 * See the COPYING.LIB file in the top-level directory.
12 *
13 */
14
15 #include "qemu/osdep.h"
16 #include "trace.h"
17 #include "qemu/sockets.h" /* for EINPROGRESS on Windows */
18 #include "qed.h"
19 #include "qemu/bswap.h"
20
21 typedef struct {
22 GenericCB gencb;
23 BDRVQEDState *s;
24 QEDTable *table;
25
26 struct iovec iov;
27 QEMUIOVector qiov;
28 } QEDReadTableCB;
29
30 static void qed_read_table_cb(void *opaque, int ret)
31 {
32 QEDReadTableCB *read_table_cb = opaque;
33 QEDTable *table = read_table_cb->table;
34 int noffsets = read_table_cb->qiov.size / sizeof(uint64_t);
35 int i;
36
37 /* Handle I/O error */
38 if (ret) {
39 goto out;
40 }
41
42 /* Byteswap offsets */
43 for (i = 0; i < noffsets; i++) {
44 table->offsets[i] = le64_to_cpu(table->offsets[i]);
45 }
46
47 out:
48 /* Completion */
49 trace_qed_read_table_cb(read_table_cb->s, read_table_cb->table, ret);
50 gencb_complete(&read_table_cb->gencb, ret);
51 }
52
53 static void qed_read_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
54 BlockCompletionFunc *cb, void *opaque)
55 {
56 QEDReadTableCB *read_table_cb = gencb_alloc(sizeof(*read_table_cb),
57 cb, opaque);
58 QEMUIOVector *qiov = &read_table_cb->qiov;
59
60 trace_qed_read_table(s, offset, table);
61
62 read_table_cb->s = s;
63 read_table_cb->table = table;
64 read_table_cb->iov.iov_base = table->offsets,
65 read_table_cb->iov.iov_len = s->header.cluster_size * s->header.table_size,
66
67 qemu_iovec_init_external(qiov, &read_table_cb->iov, 1);
68 bdrv_aio_readv(s->bs->file, offset / BDRV_SECTOR_SIZE, qiov,
69 qiov->size / BDRV_SECTOR_SIZE,
70 qed_read_table_cb, read_table_cb);
71 }
72
73 typedef struct {
74 GenericCB gencb;
75 BDRVQEDState *s;
76 QEDTable *orig_table;
77 QEDTable *table;
78 bool flush; /* flush after write? */
79
80 struct iovec iov;
81 QEMUIOVector qiov;
82 } QEDWriteTableCB;
83
84 static void qed_write_table_cb(void *opaque, int ret)
85 {
86 QEDWriteTableCB *write_table_cb = opaque;
87
88 trace_qed_write_table_cb(write_table_cb->s,
89 write_table_cb->orig_table,
90 write_table_cb->flush,
91 ret);
92
93 if (ret) {
94 goto out;
95 }
96
97 if (write_table_cb->flush) {
98 /* We still need to flush first */
99 write_table_cb->flush = false;
100 bdrv_aio_flush(write_table_cb->s->bs, qed_write_table_cb,
101 write_table_cb);
102 return;
103 }
104
105 out:
106 qemu_vfree(write_table_cb->table);
107 gencb_complete(&write_table_cb->gencb, ret);
108 }
109
110 /**
111 * Write out an updated part or all of a table
112 *
113 * @s: QED state
114 * @offset: Offset of table in image file, in bytes
115 * @table: Table
116 * @index: Index of first element
117 * @n: Number of elements
118 * @flush: Whether or not to sync to disk
119 * @cb: Completion function
120 * @opaque: Argument for completion function
121 */
122 static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
123 unsigned int index, unsigned int n, bool flush,
124 BlockCompletionFunc *cb, void *opaque)
125 {
126 QEDWriteTableCB *write_table_cb;
127 unsigned int sector_mask = BDRV_SECTOR_SIZE / sizeof(uint64_t) - 1;
128 unsigned int start, end, i;
129 size_t len_bytes;
130
131 trace_qed_write_table(s, offset, table, index, n);
132
133 /* Calculate indices of the first and one after last elements */
134 start = index & ~sector_mask;
135 end = (index + n + sector_mask) & ~sector_mask;
136
137 len_bytes = (end - start) * sizeof(uint64_t);
138
139 write_table_cb = gencb_alloc(sizeof(*write_table_cb), cb, opaque);
140 write_table_cb->s = s;
141 write_table_cb->orig_table = table;
142 write_table_cb->flush = flush;
143 write_table_cb->table = qemu_blockalign(s->bs, len_bytes);
144 write_table_cb->iov.iov_base = write_table_cb->table->offsets;
145 write_table_cb->iov.iov_len = len_bytes;
146 qemu_iovec_init_external(&write_table_cb->qiov, &write_table_cb->iov, 1);
147
148 /* Byteswap table */
149 for (i = start; i < end; i++) {
150 uint64_t le_offset = cpu_to_le64(table->offsets[i]);
151 write_table_cb->table->offsets[i - start] = le_offset;
152 }
153
154 /* Adjust for offset into table */
155 offset += start * sizeof(uint64_t);
156
157 bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
158 &write_table_cb->qiov,
159 write_table_cb->qiov.size / BDRV_SECTOR_SIZE,
160 qed_write_table_cb, write_table_cb);
161 }
162
163 /**
164 * Propagate return value from async callback
165 */
166 static void qed_sync_cb(void *opaque, int ret)
167 {
168 *(int *)opaque = ret;
169 }
170
171 int qed_read_l1_table_sync(BDRVQEDState *s)
172 {
173 int ret = -EINPROGRESS;
174
175 qed_read_table(s, s->header.l1_table_offset,
176 s->l1_table, qed_sync_cb, &ret);
177 BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
178
179 return ret;
180 }
181
182 void qed_write_l1_table(BDRVQEDState *s, unsigned int index, unsigned int n,
183 BlockCompletionFunc *cb, void *opaque)
184 {
185 BLKDBG_EVENT(s->bs->file, BLKDBG_L1_UPDATE);
186 qed_write_table(s, s->header.l1_table_offset,
187 s->l1_table, index, n, false, cb, opaque);
188 }
189
190 int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index,
191 unsigned int n)
192 {
193 int ret = -EINPROGRESS;
194
195 qed_write_l1_table(s, index, n, qed_sync_cb, &ret);
196 BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
197
198 return ret;
199 }
200
201 typedef struct {
202 GenericCB gencb;
203 BDRVQEDState *s;
204 uint64_t l2_offset;
205 QEDRequest *request;
206 } QEDReadL2TableCB;
207
208 static void qed_read_l2_table_cb(void *opaque, int ret)
209 {
210 QEDReadL2TableCB *read_l2_table_cb = opaque;
211 QEDRequest *request = read_l2_table_cb->request;
212 BDRVQEDState *s = read_l2_table_cb->s;
213 CachedL2Table *l2_table = request->l2_table;
214 uint64_t l2_offset = read_l2_table_cb->l2_offset;
215
216 if (ret) {
217 /* can't trust loaded L2 table anymore */
218 qed_unref_l2_cache_entry(l2_table);
219 request->l2_table = NULL;
220 } else {
221 l2_table->offset = l2_offset;
222
223 qed_commit_l2_cache_entry(&s->l2_cache, l2_table);
224
225 /* This is guaranteed to succeed because we just committed the entry
226 * to the cache.
227 */
228 request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, l2_offset);
229 assert(request->l2_table != NULL);
230 }
231
232 gencb_complete(&read_l2_table_cb->gencb, ret);
233 }
234
235 void qed_read_l2_table(BDRVQEDState *s, QEDRequest *request, uint64_t offset,
236 BlockCompletionFunc *cb, void *opaque)
237 {
238 QEDReadL2TableCB *read_l2_table_cb;
239
240 qed_unref_l2_cache_entry(request->l2_table);
241
242 /* Check for cached L2 entry */
243 request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, offset);
244 if (request->l2_table) {
245 cb(opaque, 0);
246 return;
247 }
248
249 request->l2_table = qed_alloc_l2_cache_entry(&s->l2_cache);
250 request->l2_table->table = qed_alloc_table(s);
251
252 read_l2_table_cb = gencb_alloc(sizeof(*read_l2_table_cb), cb, opaque);
253 read_l2_table_cb->s = s;
254 read_l2_table_cb->l2_offset = offset;
255 read_l2_table_cb->request = request;
256
257 BLKDBG_EVENT(s->bs->file, BLKDBG_L2_LOAD);
258 qed_read_table(s, offset, request->l2_table->table,
259 qed_read_l2_table_cb, read_l2_table_cb);
260 }
261
262 int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset)
263 {
264 int ret = -EINPROGRESS;
265
266 qed_read_l2_table(s, request, offset, qed_sync_cb, &ret);
267 BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
268
269 return ret;
270 }
271
272 void qed_write_l2_table(BDRVQEDState *s, QEDRequest *request,
273 unsigned int index, unsigned int n, bool flush,
274 BlockCompletionFunc *cb, void *opaque)
275 {
276 BLKDBG_EVENT(s->bs->file, BLKDBG_L2_UPDATE);
277 qed_write_table(s, request->l2_table->offset,
278 request->l2_table->table, index, n, flush, cb, opaque);
279 }
280
281 int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request,
282 unsigned int index, unsigned int n, bool flush)
283 {
284 int ret = -EINPROGRESS;
285
286 qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret);
287 BDRV_POLL_WHILE(s->bs, ret == -EINPROGRESS);
288
289 return ret;
290 }