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Commit | Line | Data |
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244ab90e AL |
1 | /* |
2 | * DMA helper functions | |
3 | * | |
4 | * Copyright (c) 2009 Red Hat | |
5 | * | |
6 | * This work is licensed under the terms of the GNU General Public License | |
7 | * (GNU GPL), version 2 or later. | |
8 | */ | |
9 | ||
10 | #include "dma.h" | |
c57c4658 | 11 | #include "trace.h" |
244ab90e AL |
12 | |
13 | void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint) | |
14 | { | |
7267c094 | 15 | qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry)); |
244ab90e AL |
16 | qsg->nsg = 0; |
17 | qsg->nalloc = alloc_hint; | |
18 | qsg->size = 0; | |
19 | } | |
20 | ||
d3231181 | 21 | void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len) |
244ab90e AL |
22 | { |
23 | if (qsg->nsg == qsg->nalloc) { | |
24 | qsg->nalloc = 2 * qsg->nalloc + 1; | |
7267c094 | 25 | qsg->sg = g_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry)); |
244ab90e AL |
26 | } |
27 | qsg->sg[qsg->nsg].base = base; | |
28 | qsg->sg[qsg->nsg].len = len; | |
29 | qsg->size += len; | |
30 | ++qsg->nsg; | |
31 | } | |
32 | ||
33 | void qemu_sglist_destroy(QEMUSGList *qsg) | |
34 | { | |
7267c094 | 35 | g_free(qsg->sg); |
244ab90e AL |
36 | } |
37 | ||
59a703eb | 38 | typedef struct { |
37b7842c | 39 | BlockDriverAIOCB common; |
59a703eb AL |
40 | BlockDriverState *bs; |
41 | BlockDriverAIOCB *acb; | |
42 | QEMUSGList *sg; | |
43 | uint64_t sector_num; | |
bbca72c6 | 44 | bool to_dev; |
c3adb5b9 | 45 | bool in_cancel; |
59a703eb | 46 | int sg_cur_index; |
d3231181 | 47 | dma_addr_t sg_cur_byte; |
59a703eb AL |
48 | QEMUIOVector iov; |
49 | QEMUBH *bh; | |
cb144ccb | 50 | DMAIOFunc *io_func; |
37b7842c | 51 | } DMAAIOCB; |
59a703eb AL |
52 | |
53 | static void dma_bdrv_cb(void *opaque, int ret); | |
54 | ||
55 | static void reschedule_dma(void *opaque) | |
56 | { | |
37b7842c | 57 | DMAAIOCB *dbs = (DMAAIOCB *)opaque; |
59a703eb AL |
58 | |
59 | qemu_bh_delete(dbs->bh); | |
60 | dbs->bh = NULL; | |
c3adb5b9 | 61 | dma_bdrv_cb(dbs, 0); |
59a703eb AL |
62 | } |
63 | ||
64 | static void continue_after_map_failure(void *opaque) | |
65 | { | |
37b7842c | 66 | DMAAIOCB *dbs = (DMAAIOCB *)opaque; |
59a703eb AL |
67 | |
68 | dbs->bh = qemu_bh_new(reschedule_dma, dbs); | |
69 | qemu_bh_schedule(dbs->bh); | |
70 | } | |
71 | ||
7403b14e | 72 | static void dma_bdrv_unmap(DMAAIOCB *dbs) |
59a703eb | 73 | { |
59a703eb AL |
74 | int i; |
75 | ||
59a703eb AL |
76 | for (i = 0; i < dbs->iov.niov; ++i) { |
77 | cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base, | |
bbca72c6 | 78 | dbs->iov.iov[i].iov_len, !dbs->to_dev, |
59a703eb AL |
79 | dbs->iov.iov[i].iov_len); |
80 | } | |
c3adb5b9 PB |
81 | qemu_iovec_reset(&dbs->iov); |
82 | } | |
83 | ||
84 | static void dma_complete(DMAAIOCB *dbs, int ret) | |
85 | { | |
c57c4658 KW |
86 | trace_dma_complete(dbs, ret, dbs->common.cb); |
87 | ||
c3adb5b9 PB |
88 | dma_bdrv_unmap(dbs); |
89 | if (dbs->common.cb) { | |
90 | dbs->common.cb(dbs->common.opaque, ret); | |
91 | } | |
92 | qemu_iovec_destroy(&dbs->iov); | |
93 | if (dbs->bh) { | |
94 | qemu_bh_delete(dbs->bh); | |
95 | dbs->bh = NULL; | |
96 | } | |
97 | if (!dbs->in_cancel) { | |
98 | /* Requests may complete while dma_aio_cancel is in progress. In | |
99 | * this case, the AIOCB should not be released because it is still | |
100 | * referenced by dma_aio_cancel. */ | |
101 | qemu_aio_release(dbs); | |
102 | } | |
7403b14e AL |
103 | } |
104 | ||
856ae5c3 | 105 | static void dma_bdrv_cb(void *opaque, int ret) |
7403b14e AL |
106 | { |
107 | DMAAIOCB *dbs = (DMAAIOCB *)opaque; | |
c227f099 | 108 | target_phys_addr_t cur_addr, cur_len; |
7403b14e AL |
109 | void *mem; |
110 | ||
c57c4658 KW |
111 | trace_dma_bdrv_cb(dbs, ret); |
112 | ||
7403b14e AL |
113 | dbs->acb = NULL; |
114 | dbs->sector_num += dbs->iov.size / 512; | |
115 | dma_bdrv_unmap(dbs); | |
59a703eb AL |
116 | |
117 | if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) { | |
c3adb5b9 | 118 | dma_complete(dbs, ret); |
59a703eb AL |
119 | return; |
120 | } | |
121 | ||
122 | while (dbs->sg_cur_index < dbs->sg->nsg) { | |
123 | cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte; | |
124 | cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte; | |
bbca72c6 | 125 | mem = cpu_physical_memory_map(cur_addr, &cur_len, !dbs->to_dev); |
59a703eb AL |
126 | if (!mem) |
127 | break; | |
128 | qemu_iovec_add(&dbs->iov, mem, cur_len); | |
129 | dbs->sg_cur_byte += cur_len; | |
130 | if (dbs->sg_cur_byte == dbs->sg->sg[dbs->sg_cur_index].len) { | |
131 | dbs->sg_cur_byte = 0; | |
132 | ++dbs->sg_cur_index; | |
133 | } | |
134 | } | |
135 | ||
136 | if (dbs->iov.size == 0) { | |
c57c4658 | 137 | trace_dma_map_wait(dbs); |
59a703eb AL |
138 | cpu_register_map_client(dbs, continue_after_map_failure); |
139 | return; | |
140 | } | |
141 | ||
cb144ccb CH |
142 | dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov, |
143 | dbs->iov.size / 512, dma_bdrv_cb, dbs); | |
6bee44ea | 144 | assert(dbs->acb); |
59a703eb AL |
145 | } |
146 | ||
c16b5a2c CH |
147 | static void dma_aio_cancel(BlockDriverAIOCB *acb) |
148 | { | |
149 | DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common); | |
150 | ||
c57c4658 KW |
151 | trace_dma_aio_cancel(dbs); |
152 | ||
c16b5a2c | 153 | if (dbs->acb) { |
c3adb5b9 PB |
154 | BlockDriverAIOCB *acb = dbs->acb; |
155 | dbs->acb = NULL; | |
156 | dbs->in_cancel = true; | |
157 | bdrv_aio_cancel(acb); | |
158 | dbs->in_cancel = false; | |
c16b5a2c | 159 | } |
c3adb5b9 PB |
160 | dbs->common.cb = NULL; |
161 | dma_complete(dbs, 0); | |
c16b5a2c CH |
162 | } |
163 | ||
164 | static AIOPool dma_aio_pool = { | |
165 | .aiocb_size = sizeof(DMAAIOCB), | |
166 | .cancel = dma_aio_cancel, | |
167 | }; | |
168 | ||
cb144ccb | 169 | BlockDriverAIOCB *dma_bdrv_io( |
59a703eb | 170 | BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num, |
cb144ccb | 171 | DMAIOFunc *io_func, BlockDriverCompletionFunc *cb, |
bbca72c6 | 172 | void *opaque, bool to_dev) |
59a703eb | 173 | { |
cb144ccb | 174 | DMAAIOCB *dbs = qemu_aio_get(&dma_aio_pool, bs, cb, opaque); |
59a703eb | 175 | |
c57c4658 KW |
176 | trace_dma_bdrv_io(dbs, bs, sector_num, to_dev); |
177 | ||
37b7842c | 178 | dbs->acb = NULL; |
59a703eb | 179 | dbs->bs = bs; |
59a703eb AL |
180 | dbs->sg = sg; |
181 | dbs->sector_num = sector_num; | |
182 | dbs->sg_cur_index = 0; | |
183 | dbs->sg_cur_byte = 0; | |
bbca72c6 | 184 | dbs->to_dev = to_dev; |
cb144ccb | 185 | dbs->io_func = io_func; |
59a703eb AL |
186 | dbs->bh = NULL; |
187 | qemu_iovec_init(&dbs->iov, sg->nsg); | |
188 | dma_bdrv_cb(dbs, 0); | |
37b7842c | 189 | return &dbs->common; |
59a703eb AL |
190 | } |
191 | ||
192 | ||
193 | BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs, | |
194 | QEMUSGList *sg, uint64_t sector, | |
195 | void (*cb)(void *opaque, int ret), void *opaque) | |
196 | { | |
bbca72c6 | 197 | return dma_bdrv_io(bs, sg, sector, bdrv_aio_readv, cb, opaque, false); |
59a703eb AL |
198 | } |
199 | ||
200 | BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs, | |
201 | QEMUSGList *sg, uint64_t sector, | |
202 | void (*cb)(void *opaque, int ret), void *opaque) | |
203 | { | |
bbca72c6 | 204 | return dma_bdrv_io(bs, sg, sector, bdrv_aio_writev, cb, opaque, true); |
59a703eb | 205 | } |
8171ee35 PB |
206 | |
207 | ||
208 | static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_dev) | |
209 | { | |
210 | uint64_t resid; | |
211 | int sg_cur_index; | |
212 | ||
213 | resid = sg->size; | |
214 | sg_cur_index = 0; | |
215 | len = MIN(len, resid); | |
216 | while (len > 0) { | |
217 | ScatterGatherEntry entry = sg->sg[sg_cur_index++]; | |
218 | int32_t xfer = MIN(len, entry.len); | |
219 | cpu_physical_memory_rw(entry.base, ptr, xfer, !to_dev); | |
220 | ptr += xfer; | |
221 | len -= xfer; | |
222 | resid -= xfer; | |
223 | } | |
224 | ||
225 | return resid; | |
226 | } | |
227 | ||
228 | uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg) | |
229 | { | |
230 | return dma_buf_rw(ptr, len, sg, 0); | |
231 | } | |
232 | ||
233 | uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg) | |
234 | { | |
235 | return dma_buf_rw(ptr, len, sg, 1); | |
236 | } | |
84a69356 PB |
237 | |
238 | void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, | |
239 | QEMUSGList *sg, enum BlockAcctType type) | |
240 | { | |
241 | bdrv_acct_start(bs, cookie, sg->size, type); | |
242 | } |