root / dma-helpers.c @ d3231181
History | View | Annotate | Download (5.1 kB)
1 | 244ab90e | aliguori | /*
|
---|---|---|---|
2 | 244ab90e | aliguori | * DMA helper functions
|
3 | 244ab90e | aliguori | *
|
4 | 244ab90e | aliguori | * Copyright (c) 2009 Red Hat
|
5 | 244ab90e | aliguori | *
|
6 | 244ab90e | aliguori | * This work is licensed under the terms of the GNU General Public License
|
7 | 244ab90e | aliguori | * (GNU GPL), version 2 or later.
|
8 | 244ab90e | aliguori | */
|
9 | 244ab90e | aliguori | |
10 | 244ab90e | aliguori | #include "dma.h" |
11 | 59a703eb | aliguori | #include "block_int.h" |
12 | 244ab90e | aliguori | |
13 | 244ab90e | aliguori | void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint) |
14 | 244ab90e | aliguori | { |
15 | 7267c094 | Anthony Liguori | qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
|
16 | 244ab90e | aliguori | qsg->nsg = 0;
|
17 | 244ab90e | aliguori | qsg->nalloc = alloc_hint; |
18 | 244ab90e | aliguori | qsg->size = 0;
|
19 | 244ab90e | aliguori | } |
20 | 244ab90e | aliguori | |
21 | d3231181 | David Gibson | void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len)
|
22 | 244ab90e | aliguori | { |
23 | 244ab90e | aliguori | if (qsg->nsg == qsg->nalloc) {
|
24 | 244ab90e | aliguori | qsg->nalloc = 2 * qsg->nalloc + 1; |
25 | 7267c094 | Anthony Liguori | qsg->sg = g_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
|
26 | 244ab90e | aliguori | } |
27 | 244ab90e | aliguori | qsg->sg[qsg->nsg].base = base; |
28 | 244ab90e | aliguori | qsg->sg[qsg->nsg].len = len; |
29 | 244ab90e | aliguori | qsg->size += len; |
30 | 244ab90e | aliguori | ++qsg->nsg; |
31 | 244ab90e | aliguori | } |
32 | 244ab90e | aliguori | |
33 | 244ab90e | aliguori | void qemu_sglist_destroy(QEMUSGList *qsg)
|
34 | 244ab90e | aliguori | { |
35 | 7267c094 | Anthony Liguori | g_free(qsg->sg); |
36 | 244ab90e | aliguori | } |
37 | 244ab90e | aliguori | |
38 | 59a703eb | aliguori | typedef struct { |
39 | 37b7842c | aliguori | BlockDriverAIOCB common; |
40 | 59a703eb | aliguori | BlockDriverState *bs; |
41 | 59a703eb | aliguori | BlockDriverAIOCB *acb; |
42 | 59a703eb | aliguori | QEMUSGList *sg; |
43 | 59a703eb | aliguori | uint64_t sector_num; |
44 | bbca72c6 | Paolo Bonzini | bool to_dev;
|
45 | c3adb5b9 | Paolo Bonzini | bool in_cancel;
|
46 | 59a703eb | aliguori | int sg_cur_index;
|
47 | d3231181 | David Gibson | dma_addr_t sg_cur_byte; |
48 | 59a703eb | aliguori | QEMUIOVector iov; |
49 | 59a703eb | aliguori | QEMUBH *bh; |
50 | cb144ccb | Christoph Hellwig | DMAIOFunc *io_func; |
51 | 37b7842c | aliguori | } DMAAIOCB; |
52 | 59a703eb | aliguori | |
53 | 59a703eb | aliguori | static void dma_bdrv_cb(void *opaque, int ret); |
54 | 59a703eb | aliguori | |
55 | 59a703eb | aliguori | static void reschedule_dma(void *opaque) |
56 | 59a703eb | aliguori | { |
57 | 37b7842c | aliguori | DMAAIOCB *dbs = (DMAAIOCB *)opaque; |
58 | 59a703eb | aliguori | |
59 | 59a703eb | aliguori | qemu_bh_delete(dbs->bh); |
60 | 59a703eb | aliguori | dbs->bh = NULL;
|
61 | c3adb5b9 | Paolo Bonzini | dma_bdrv_cb(dbs, 0);
|
62 | 59a703eb | aliguori | } |
63 | 59a703eb | aliguori | |
64 | 59a703eb | aliguori | static void continue_after_map_failure(void *opaque) |
65 | 59a703eb | aliguori | { |
66 | 37b7842c | aliguori | DMAAIOCB *dbs = (DMAAIOCB *)opaque; |
67 | 59a703eb | aliguori | |
68 | 59a703eb | aliguori | dbs->bh = qemu_bh_new(reschedule_dma, dbs); |
69 | 59a703eb | aliguori | qemu_bh_schedule(dbs->bh); |
70 | 59a703eb | aliguori | } |
71 | 59a703eb | aliguori | |
72 | 7403b14e | aliguori | static void dma_bdrv_unmap(DMAAIOCB *dbs) |
73 | 59a703eb | aliguori | { |
74 | 59a703eb | aliguori | int i;
|
75 | 59a703eb | aliguori | |
76 | 59a703eb | aliguori | for (i = 0; i < dbs->iov.niov; ++i) { |
77 | 59a703eb | aliguori | cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base, |
78 | bbca72c6 | Paolo Bonzini | dbs->iov.iov[i].iov_len, !dbs->to_dev, |
79 | 59a703eb | aliguori | dbs->iov.iov[i].iov_len); |
80 | 59a703eb | aliguori | } |
81 | c3adb5b9 | Paolo Bonzini | qemu_iovec_reset(&dbs->iov); |
82 | c3adb5b9 | Paolo Bonzini | } |
83 | c3adb5b9 | Paolo Bonzini | |
84 | c3adb5b9 | Paolo Bonzini | static void dma_complete(DMAAIOCB *dbs, int ret) |
85 | c3adb5b9 | Paolo Bonzini | { |
86 | c3adb5b9 | Paolo Bonzini | dma_bdrv_unmap(dbs); |
87 | c3adb5b9 | Paolo Bonzini | if (dbs->common.cb) {
|
88 | c3adb5b9 | Paolo Bonzini | dbs->common.cb(dbs->common.opaque, ret); |
89 | c3adb5b9 | Paolo Bonzini | } |
90 | c3adb5b9 | Paolo Bonzini | qemu_iovec_destroy(&dbs->iov); |
91 | c3adb5b9 | Paolo Bonzini | if (dbs->bh) {
|
92 | c3adb5b9 | Paolo Bonzini | qemu_bh_delete(dbs->bh); |
93 | c3adb5b9 | Paolo Bonzini | dbs->bh = NULL;
|
94 | c3adb5b9 | Paolo Bonzini | } |
95 | c3adb5b9 | Paolo Bonzini | if (!dbs->in_cancel) {
|
96 | c3adb5b9 | Paolo Bonzini | /* Requests may complete while dma_aio_cancel is in progress. In
|
97 | c3adb5b9 | Paolo Bonzini | * this case, the AIOCB should not be released because it is still
|
98 | c3adb5b9 | Paolo Bonzini | * referenced by dma_aio_cancel. */
|
99 | c3adb5b9 | Paolo Bonzini | qemu_aio_release(dbs); |
100 | c3adb5b9 | Paolo Bonzini | } |
101 | 7403b14e | aliguori | } |
102 | 7403b14e | aliguori | |
103 | 856ae5c3 | blueswir1 | static void dma_bdrv_cb(void *opaque, int ret) |
104 | 7403b14e | aliguori | { |
105 | 7403b14e | aliguori | DMAAIOCB *dbs = (DMAAIOCB *)opaque; |
106 | c227f099 | Anthony Liguori | target_phys_addr_t cur_addr, cur_len; |
107 | 7403b14e | aliguori | void *mem;
|
108 | 7403b14e | aliguori | |
109 | 7403b14e | aliguori | dbs->acb = NULL;
|
110 | 7403b14e | aliguori | dbs->sector_num += dbs->iov.size / 512;
|
111 | 7403b14e | aliguori | dma_bdrv_unmap(dbs); |
112 | 59a703eb | aliguori | |
113 | 59a703eb | aliguori | if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) { |
114 | c3adb5b9 | Paolo Bonzini | dma_complete(dbs, ret); |
115 | 59a703eb | aliguori | return;
|
116 | 59a703eb | aliguori | } |
117 | 59a703eb | aliguori | |
118 | 59a703eb | aliguori | while (dbs->sg_cur_index < dbs->sg->nsg) {
|
119 | 59a703eb | aliguori | cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte; |
120 | 59a703eb | aliguori | cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte; |
121 | bbca72c6 | Paolo Bonzini | mem = cpu_physical_memory_map(cur_addr, &cur_len, !dbs->to_dev); |
122 | 59a703eb | aliguori | if (!mem)
|
123 | 59a703eb | aliguori | break;
|
124 | 59a703eb | aliguori | qemu_iovec_add(&dbs->iov, mem, cur_len); |
125 | 59a703eb | aliguori | dbs->sg_cur_byte += cur_len; |
126 | 59a703eb | aliguori | if (dbs->sg_cur_byte == dbs->sg->sg[dbs->sg_cur_index].len) {
|
127 | 59a703eb | aliguori | dbs->sg_cur_byte = 0;
|
128 | 59a703eb | aliguori | ++dbs->sg_cur_index; |
129 | 59a703eb | aliguori | } |
130 | 59a703eb | aliguori | } |
131 | 59a703eb | aliguori | |
132 | 59a703eb | aliguori | if (dbs->iov.size == 0) { |
133 | 59a703eb | aliguori | cpu_register_map_client(dbs, continue_after_map_failure); |
134 | 59a703eb | aliguori | return;
|
135 | 59a703eb | aliguori | } |
136 | 59a703eb | aliguori | |
137 | cb144ccb | Christoph Hellwig | dbs->acb = dbs->io_func(dbs->bs, dbs->sector_num, &dbs->iov, |
138 | cb144ccb | Christoph Hellwig | dbs->iov.size / 512, dma_bdrv_cb, dbs);
|
139 | 7403b14e | aliguori | if (!dbs->acb) {
|
140 | c3adb5b9 | Paolo Bonzini | dma_complete(dbs, -EIO); |
141 | 7403b14e | aliguori | } |
142 | 59a703eb | aliguori | } |
143 | 59a703eb | aliguori | |
144 | c16b5a2c | Christoph Hellwig | static void dma_aio_cancel(BlockDriverAIOCB *acb) |
145 | c16b5a2c | Christoph Hellwig | { |
146 | c16b5a2c | Christoph Hellwig | DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common); |
147 | c16b5a2c | Christoph Hellwig | |
148 | c16b5a2c | Christoph Hellwig | if (dbs->acb) {
|
149 | c3adb5b9 | Paolo Bonzini | BlockDriverAIOCB *acb = dbs->acb; |
150 | c3adb5b9 | Paolo Bonzini | dbs->acb = NULL;
|
151 | c3adb5b9 | Paolo Bonzini | dbs->in_cancel = true;
|
152 | c3adb5b9 | Paolo Bonzini | bdrv_aio_cancel(acb); |
153 | c3adb5b9 | Paolo Bonzini | dbs->in_cancel = false;
|
154 | c16b5a2c | Christoph Hellwig | } |
155 | c3adb5b9 | Paolo Bonzini | dbs->common.cb = NULL;
|
156 | c3adb5b9 | Paolo Bonzini | dma_complete(dbs, 0);
|
157 | c16b5a2c | Christoph Hellwig | } |
158 | c16b5a2c | Christoph Hellwig | |
159 | c16b5a2c | Christoph Hellwig | static AIOPool dma_aio_pool = {
|
160 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(DMAAIOCB),
|
161 | c16b5a2c | Christoph Hellwig | .cancel = dma_aio_cancel, |
162 | c16b5a2c | Christoph Hellwig | }; |
163 | c16b5a2c | Christoph Hellwig | |
164 | cb144ccb | Christoph Hellwig | BlockDriverAIOCB *dma_bdrv_io( |
165 | 59a703eb | aliguori | BlockDriverState *bs, QEMUSGList *sg, uint64_t sector_num, |
166 | cb144ccb | Christoph Hellwig | DMAIOFunc *io_func, BlockDriverCompletionFunc *cb, |
167 | bbca72c6 | Paolo Bonzini | void *opaque, bool to_dev) |
168 | 59a703eb | aliguori | { |
169 | cb144ccb | Christoph Hellwig | DMAAIOCB *dbs = qemu_aio_get(&dma_aio_pool, bs, cb, opaque); |
170 | 59a703eb | aliguori | |
171 | 37b7842c | aliguori | dbs->acb = NULL;
|
172 | 59a703eb | aliguori | dbs->bs = bs; |
173 | 59a703eb | aliguori | dbs->sg = sg; |
174 | 59a703eb | aliguori | dbs->sector_num = sector_num; |
175 | 59a703eb | aliguori | dbs->sg_cur_index = 0;
|
176 | 59a703eb | aliguori | dbs->sg_cur_byte = 0;
|
177 | bbca72c6 | Paolo Bonzini | dbs->to_dev = to_dev; |
178 | cb144ccb | Christoph Hellwig | dbs->io_func = io_func; |
179 | 59a703eb | aliguori | dbs->bh = NULL;
|
180 | 59a703eb | aliguori | qemu_iovec_init(&dbs->iov, sg->nsg); |
181 | 59a703eb | aliguori | dma_bdrv_cb(dbs, 0);
|
182 | 37b7842c | aliguori | return &dbs->common;
|
183 | 59a703eb | aliguori | } |
184 | 59a703eb | aliguori | |
185 | 59a703eb | aliguori | |
186 | 59a703eb | aliguori | BlockDriverAIOCB *dma_bdrv_read(BlockDriverState *bs, |
187 | 59a703eb | aliguori | QEMUSGList *sg, uint64_t sector, |
188 | 59a703eb | aliguori | void (*cb)(void *opaque, int ret), void *opaque) |
189 | 59a703eb | aliguori | { |
190 | bbca72c6 | Paolo Bonzini | return dma_bdrv_io(bs, sg, sector, bdrv_aio_readv, cb, opaque, false); |
191 | 59a703eb | aliguori | } |
192 | 59a703eb | aliguori | |
193 | 59a703eb | aliguori | BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs, |
194 | 59a703eb | aliguori | QEMUSGList *sg, uint64_t sector, |
195 | 59a703eb | aliguori | void (*cb)(void *opaque, int ret), void *opaque) |
196 | 59a703eb | aliguori | { |
197 | bbca72c6 | Paolo Bonzini | return dma_bdrv_io(bs, sg, sector, bdrv_aio_writev, cb, opaque, true); |
198 | 59a703eb | aliguori | } |