pflash: Restore & fix lazy ROMD switching
[qemu.git] / block / qed-table.c
blobd38c673547e32368fa3a52615e98ba08f52967cc
1 /*
2 * QEMU Enhanced Disk Format Table I/O
4 * Copyright IBM, Corp. 2010
6 * Authors:
7 * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
8 * Anthony Liguori <aliguori@us.ibm.com>
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.
15 #include "trace.h"
16 #include "qemu_socket.h" /* for EINPROGRESS on Windows */
17 #include "qed.h"
19 typedef struct {
20 GenericCB gencb;
21 BDRVQEDState *s;
22 QEDTable *table;
24 struct iovec iov;
25 QEMUIOVector qiov;
26 } QEDReadTableCB;
28 static void qed_read_table_cb(void *opaque, int ret)
30 QEDReadTableCB *read_table_cb = opaque;
31 QEDTable *table = read_table_cb->table;
32 int noffsets = read_table_cb->iov.iov_len / sizeof(uint64_t);
33 int i;
35 /* Handle I/O error */
36 if (ret) {
37 goto out;
40 /* Byteswap offsets */
41 for (i = 0; i < noffsets; i++) {
42 table->offsets[i] = le64_to_cpu(table->offsets[i]);
45 out:
46 /* Completion */
47 trace_qed_read_table_cb(read_table_cb->s, read_table_cb->table, ret);
48 gencb_complete(&read_table_cb->gencb, ret);
51 static void qed_read_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
52 BlockDriverCompletionFunc *cb, void *opaque)
54 QEDReadTableCB *read_table_cb = gencb_alloc(sizeof(*read_table_cb),
55 cb, opaque);
56 QEMUIOVector *qiov = &read_table_cb->qiov;
57 BlockDriverAIOCB *aiocb;
59 trace_qed_read_table(s, offset, table);
61 read_table_cb->s = s;
62 read_table_cb->table = table;
63 read_table_cb->iov.iov_base = table->offsets,
64 read_table_cb->iov.iov_len = s->header.cluster_size * s->header.table_size,
66 qemu_iovec_init_external(qiov, &read_table_cb->iov, 1);
67 aiocb = bdrv_aio_readv(s->bs->file, offset / BDRV_SECTOR_SIZE, qiov,
68 read_table_cb->iov.iov_len / BDRV_SECTOR_SIZE,
69 qed_read_table_cb, read_table_cb);
70 if (!aiocb) {
71 qed_read_table_cb(read_table_cb, -EIO);
75 typedef struct {
76 GenericCB gencb;
77 BDRVQEDState *s;
78 QEDTable *orig_table;
79 QEDTable *table;
80 bool flush; /* flush after write? */
82 struct iovec iov;
83 QEMUIOVector qiov;
84 } QEDWriteTableCB;
86 static void qed_write_table_cb(void *opaque, int ret)
88 QEDWriteTableCB *write_table_cb = opaque;
90 trace_qed_write_table_cb(write_table_cb->s,
91 write_table_cb->orig_table,
92 write_table_cb->flush,
93 ret);
95 if (ret) {
96 goto out;
99 if (write_table_cb->flush) {
100 /* We still need to flush first */
101 write_table_cb->flush = false;
102 bdrv_aio_flush(write_table_cb->s->bs, qed_write_table_cb,
103 write_table_cb);
104 return;
107 out:
108 qemu_vfree(write_table_cb->table);
109 gencb_complete(&write_table_cb->gencb, ret);
110 return;
114 * Write out an updated part or all of a table
116 * @s: QED state
117 * @offset: Offset of table in image file, in bytes
118 * @table: Table
119 * @index: Index of first element
120 * @n: Number of elements
121 * @flush: Whether or not to sync to disk
122 * @cb: Completion function
123 * @opaque: Argument for completion function
125 static void qed_write_table(BDRVQEDState *s, uint64_t offset, QEDTable *table,
126 unsigned int index, unsigned int n, bool flush,
127 BlockDriverCompletionFunc *cb, void *opaque)
129 QEDWriteTableCB *write_table_cb;
130 BlockDriverAIOCB *aiocb;
131 unsigned int sector_mask = BDRV_SECTOR_SIZE / sizeof(uint64_t) - 1;
132 unsigned int start, end, i;
133 size_t len_bytes;
135 trace_qed_write_table(s, offset, table, index, n);
137 /* Calculate indices of the first and one after last elements */
138 start = index & ~sector_mask;
139 end = (index + n + sector_mask) & ~sector_mask;
141 len_bytes = (end - start) * sizeof(uint64_t);
143 write_table_cb = gencb_alloc(sizeof(*write_table_cb), cb, opaque);
144 write_table_cb->s = s;
145 write_table_cb->orig_table = table;
146 write_table_cb->flush = flush;
147 write_table_cb->table = qemu_blockalign(s->bs, len_bytes);
148 write_table_cb->iov.iov_base = write_table_cb->table->offsets;
149 write_table_cb->iov.iov_len = len_bytes;
150 qemu_iovec_init_external(&write_table_cb->qiov, &write_table_cb->iov, 1);
152 /* Byteswap table */
153 for (i = start; i < end; i++) {
154 uint64_t le_offset = cpu_to_le64(table->offsets[i]);
155 write_table_cb->table->offsets[i - start] = le_offset;
158 /* Adjust for offset into table */
159 offset += start * sizeof(uint64_t);
161 aiocb = bdrv_aio_writev(s->bs->file, offset / BDRV_SECTOR_SIZE,
162 &write_table_cb->qiov,
163 write_table_cb->iov.iov_len / BDRV_SECTOR_SIZE,
164 qed_write_table_cb, write_table_cb);
165 if (!aiocb) {
166 qed_write_table_cb(write_table_cb, -EIO);
171 * Propagate return value from async callback
173 static void qed_sync_cb(void *opaque, int ret)
175 *(int *)opaque = ret;
178 int qed_read_l1_table_sync(BDRVQEDState *s)
180 int ret = -EINPROGRESS;
182 async_context_push();
184 qed_read_table(s, s->header.l1_table_offset,
185 s->l1_table, qed_sync_cb, &ret);
186 while (ret == -EINPROGRESS) {
187 qemu_aio_wait();
190 async_context_pop();
192 return ret;
195 void qed_write_l1_table(BDRVQEDState *s, unsigned int index, unsigned int n,
196 BlockDriverCompletionFunc *cb, void *opaque)
198 BLKDBG_EVENT(s->bs->file, BLKDBG_L1_UPDATE);
199 qed_write_table(s, s->header.l1_table_offset,
200 s->l1_table, index, n, false, cb, opaque);
203 int qed_write_l1_table_sync(BDRVQEDState *s, unsigned int index,
204 unsigned int n)
206 int ret = -EINPROGRESS;
208 async_context_push();
210 qed_write_l1_table(s, index, n, qed_sync_cb, &ret);
211 while (ret == -EINPROGRESS) {
212 qemu_aio_wait();
215 async_context_pop();
217 return ret;
220 typedef struct {
221 GenericCB gencb;
222 BDRVQEDState *s;
223 uint64_t l2_offset;
224 QEDRequest *request;
225 } QEDReadL2TableCB;
227 static void qed_read_l2_table_cb(void *opaque, int ret)
229 QEDReadL2TableCB *read_l2_table_cb = opaque;
230 QEDRequest *request = read_l2_table_cb->request;
231 BDRVQEDState *s = read_l2_table_cb->s;
232 CachedL2Table *l2_table = request->l2_table;
234 if (ret) {
235 /* can't trust loaded L2 table anymore */
236 qed_unref_l2_cache_entry(l2_table);
237 request->l2_table = NULL;
238 } else {
239 l2_table->offset = read_l2_table_cb->l2_offset;
241 qed_commit_l2_cache_entry(&s->l2_cache, l2_table);
243 /* This is guaranteed to succeed because we just committed the entry
244 * to the cache.
246 request->l2_table = qed_find_l2_cache_entry(&s->l2_cache,
247 l2_table->offset);
248 assert(request->l2_table != NULL);
251 gencb_complete(&read_l2_table_cb->gencb, ret);
254 void qed_read_l2_table(BDRVQEDState *s, QEDRequest *request, uint64_t offset,
255 BlockDriverCompletionFunc *cb, void *opaque)
257 QEDReadL2TableCB *read_l2_table_cb;
259 qed_unref_l2_cache_entry(request->l2_table);
261 /* Check for cached L2 entry */
262 request->l2_table = qed_find_l2_cache_entry(&s->l2_cache, offset);
263 if (request->l2_table) {
264 cb(opaque, 0);
265 return;
268 request->l2_table = qed_alloc_l2_cache_entry(&s->l2_cache);
269 request->l2_table->table = qed_alloc_table(s);
271 read_l2_table_cb = gencb_alloc(sizeof(*read_l2_table_cb), cb, opaque);
272 read_l2_table_cb->s = s;
273 read_l2_table_cb->l2_offset = offset;
274 read_l2_table_cb->request = request;
276 BLKDBG_EVENT(s->bs->file, BLKDBG_L2_LOAD);
277 qed_read_table(s, offset, request->l2_table->table,
278 qed_read_l2_table_cb, read_l2_table_cb);
281 int qed_read_l2_table_sync(BDRVQEDState *s, QEDRequest *request, uint64_t offset)
283 int ret = -EINPROGRESS;
285 async_context_push();
287 qed_read_l2_table(s, request, offset, qed_sync_cb, &ret);
288 while (ret == -EINPROGRESS) {
289 qemu_aio_wait();
292 async_context_pop();
293 return ret;
296 void qed_write_l2_table(BDRVQEDState *s, QEDRequest *request,
297 unsigned int index, unsigned int n, bool flush,
298 BlockDriverCompletionFunc *cb, void *opaque)
300 BLKDBG_EVENT(s->bs->file, BLKDBG_L2_UPDATE);
301 qed_write_table(s, request->l2_table->offset,
302 request->l2_table->table, index, n, flush, cb, opaque);
305 int qed_write_l2_table_sync(BDRVQEDState *s, QEDRequest *request,
306 unsigned int index, unsigned int n, bool flush)
308 int ret = -EINPROGRESS;
310 async_context_push();
312 qed_write_l2_table(s, request, index, n, flush, qed_sync_cb, &ret);
313 while (ret == -EINPROGRESS) {
314 qemu_aio_wait();
317 async_context_pop();
318 return ret;