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aliguori244ab902009-02-05 21:23:50 +00001/*
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
Markus Armbruster4be74632014-10-07 13:59:18 +020010#include "sysemu/block-backend.h"
Paolo Bonzini9c17d612012-12-17 18:20:04 +010011#include "sysemu/dma.h"
Kevin Wolfc57c4652011-11-24 06:15:28 -050012#include "trace.h"
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010013#include "qemu/range.h"
14#include "qemu/thread.h"
Alex Bligh6a1751b2013-08-21 16:02:47 +010015#include "qemu/main-loop.h"
aliguori244ab902009-02-05 21:23:50 +000016
David Gibsone5332e62012-06-27 14:50:43 +100017/* #define DEBUG_IOMMU */
18
Paolo Bonzinidf32fd12013-04-10 18:15:49 +020019int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len)
David Gibsond86a77f2012-06-27 14:50:38 +100020{
Paolo Bonzinidf32fd12013-04-10 18:15:49 +020021 dma_barrier(as, DMA_DIRECTION_FROM_DEVICE);
Paolo Bonzini24addbc2013-04-10 17:49:04 +020022
David Gibsond86a77f2012-06-27 14:50:38 +100023#define FILLBUF_SIZE 512
24 uint8_t fillbuf[FILLBUF_SIZE];
25 int l;
Paolo Bonzini24addbc2013-04-10 17:49:04 +020026 bool error = false;
David Gibsond86a77f2012-06-27 14:50:38 +100027
28 memset(fillbuf, c, FILLBUF_SIZE);
29 while (len > 0) {
30 l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE;
Paolo Bonzini24addbc2013-04-10 17:49:04 +020031 error |= address_space_rw(as, addr, fillbuf, l, true);
Benjamin Herrenschmidtbc9b78d2012-08-14 17:41:47 +100032 len -= l;
33 addr += l;
David Gibsond86a77f2012-06-27 14:50:38 +100034 }
David Gibsone5332e62012-06-27 14:50:43 +100035
Paolo Bonzini24addbc2013-04-10 17:49:04 +020036 return error;
David Gibsond86a77f2012-06-27 14:50:38 +100037}
38
Paolo Bonzinif487b672013-06-03 14:17:19 +020039void qemu_sglist_init(QEMUSGList *qsg, DeviceState *dev, int alloc_hint,
40 AddressSpace *as)
aliguori244ab902009-02-05 21:23:50 +000041{
Anthony Liguori7267c092011-08-20 22:09:37 -050042 qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
aliguori244ab902009-02-05 21:23:50 +000043 qsg->nsg = 0;
44 qsg->nalloc = alloc_hint;
45 qsg->size = 0;
Paolo Bonzinidf32fd12013-04-10 18:15:49 +020046 qsg->as = as;
Paolo Bonzinif487b672013-06-03 14:17:19 +020047 qsg->dev = dev;
48 object_ref(OBJECT(dev));
aliguori244ab902009-02-05 21:23:50 +000049}
50
David Gibsond3231182011-10-31 17:06:46 +110051void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len)
aliguori244ab902009-02-05 21:23:50 +000052{
53 if (qsg->nsg == qsg->nalloc) {
54 qsg->nalloc = 2 * qsg->nalloc + 1;
Anthony Liguori7267c092011-08-20 22:09:37 -050055 qsg->sg = g_realloc(qsg->sg, qsg->nalloc * sizeof(ScatterGatherEntry));
aliguori244ab902009-02-05 21:23:50 +000056 }
57 qsg->sg[qsg->nsg].base = base;
58 qsg->sg[qsg->nsg].len = len;
59 qsg->size += len;
60 ++qsg->nsg;
61}
62
63void qemu_sglist_destroy(QEMUSGList *qsg)
64{
Paolo Bonzinif487b672013-06-03 14:17:19 +020065 object_unref(OBJECT(qsg->dev));
Anthony Liguori7267c092011-08-20 22:09:37 -050066 g_free(qsg->sg);
Jason Baronea8d82a2012-08-03 15:57:10 -040067 memset(qsg, 0, sizeof(*qsg));
aliguori244ab902009-02-05 21:23:50 +000068}
69
aliguori59a703e2009-02-05 21:23:58 +000070typedef struct {
Markus Armbruster7c84b1b2014-10-07 13:59:14 +020071 BlockAIOCB common;
Markus Armbruster4be74632014-10-07 13:59:18 +020072 BlockBackend *blk;
Markus Armbruster7c84b1b2014-10-07 13:59:14 +020073 BlockAIOCB *acb;
aliguori59a703e2009-02-05 21:23:58 +000074 QEMUSGList *sg;
75 uint64_t sector_num;
David Gibson43cf8ae2012-03-27 13:42:23 +110076 DMADirection dir;
aliguori59a703e2009-02-05 21:23:58 +000077 int sg_cur_index;
David Gibsond3231182011-10-31 17:06:46 +110078 dma_addr_t sg_cur_byte;
aliguori59a703e2009-02-05 21:23:58 +000079 QEMUIOVector iov;
80 QEMUBH *bh;
Christoph Hellwigcb144cc2011-05-19 10:57:59 +020081 DMAIOFunc *io_func;
aliguori37b78422009-03-20 18:26:16 +000082} DMAAIOCB;
aliguori59a703e2009-02-05 21:23:58 +000083
Markus Armbruster4be74632014-10-07 13:59:18 +020084static void dma_blk_cb(void *opaque, int ret);
aliguori59a703e2009-02-05 21:23:58 +000085
86static void reschedule_dma(void *opaque)
87{
aliguori37b78422009-03-20 18:26:16 +000088 DMAAIOCB *dbs = (DMAAIOCB *)opaque;
aliguori59a703e2009-02-05 21:23:58 +000089
90 qemu_bh_delete(dbs->bh);
91 dbs->bh = NULL;
Markus Armbruster4be74632014-10-07 13:59:18 +020092 dma_blk_cb(dbs, 0);
aliguori59a703e2009-02-05 21:23:58 +000093}
94
95static void continue_after_map_failure(void *opaque)
96{
aliguori37b78422009-03-20 18:26:16 +000097 DMAAIOCB *dbs = (DMAAIOCB *)opaque;
aliguori59a703e2009-02-05 21:23:58 +000098
99 dbs->bh = qemu_bh_new(reschedule_dma, dbs);
100 qemu_bh_schedule(dbs->bh);
101}
102
Markus Armbruster4be74632014-10-07 13:59:18 +0200103static void dma_blk_unmap(DMAAIOCB *dbs)
aliguori59a703e2009-02-05 21:23:58 +0000104{
aliguori59a703e2009-02-05 21:23:58 +0000105 int i;
106
aliguori59a703e2009-02-05 21:23:58 +0000107 for (i = 0; i < dbs->iov.niov; ++i) {
Paolo Bonzinidf32fd12013-04-10 18:15:49 +0200108 dma_memory_unmap(dbs->sg->as, dbs->iov.iov[i].iov_base,
David Gibsonc65bcef2012-06-27 14:50:40 +1000109 dbs->iov.iov[i].iov_len, dbs->dir,
110 dbs->iov.iov[i].iov_len);
aliguori59a703e2009-02-05 21:23:58 +0000111 }
Paolo Bonzinic3adb5b2011-09-16 16:40:02 +0200112 qemu_iovec_reset(&dbs->iov);
113}
114
115static void dma_complete(DMAAIOCB *dbs, int ret)
116{
Kevin Wolfc57c4652011-11-24 06:15:28 -0500117 trace_dma_complete(dbs, ret, dbs->common.cb);
118
Markus Armbruster4be74632014-10-07 13:59:18 +0200119 dma_blk_unmap(dbs);
Paolo Bonzinic3adb5b2011-09-16 16:40:02 +0200120 if (dbs->common.cb) {
121 dbs->common.cb(dbs->common.opaque, ret);
122 }
123 qemu_iovec_destroy(&dbs->iov);
124 if (dbs->bh) {
125 qemu_bh_delete(dbs->bh);
126 dbs->bh = NULL;
127 }
Fam Zheng80074292014-09-11 13:41:28 +0800128 qemu_aio_unref(dbs);
aliguori7403b142009-03-28 16:11:25 +0000129}
130
Markus Armbruster4be74632014-10-07 13:59:18 +0200131static void dma_blk_cb(void *opaque, int ret)
aliguori7403b142009-03-28 16:11:25 +0000132{
133 DMAAIOCB *dbs = (DMAAIOCB *)opaque;
David Gibsonc65bcef2012-06-27 14:50:40 +1000134 dma_addr_t cur_addr, cur_len;
aliguori7403b142009-03-28 16:11:25 +0000135 void *mem;
136
Markus Armbruster4be74632014-10-07 13:59:18 +0200137 trace_dma_blk_cb(dbs, ret);
Kevin Wolfc57c4652011-11-24 06:15:28 -0500138
aliguori7403b142009-03-28 16:11:25 +0000139 dbs->acb = NULL;
140 dbs->sector_num += dbs->iov.size / 512;
aliguori59a703e2009-02-05 21:23:58 +0000141
142 if (dbs->sg_cur_index == dbs->sg->nsg || ret < 0) {
Paolo Bonzinic3adb5b2011-09-16 16:40:02 +0200143 dma_complete(dbs, ret);
aliguori59a703e2009-02-05 21:23:58 +0000144 return;
145 }
Markus Armbruster4be74632014-10-07 13:59:18 +0200146 dma_blk_unmap(dbs);
aliguori59a703e2009-02-05 21:23:58 +0000147
148 while (dbs->sg_cur_index < dbs->sg->nsg) {
149 cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte;
150 cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte;
Paolo Bonzinidf32fd12013-04-10 18:15:49 +0200151 mem = dma_memory_map(dbs->sg->as, cur_addr, &cur_len, dbs->dir);
aliguori59a703e2009-02-05 21:23:58 +0000152 if (!mem)
153 break;
154 qemu_iovec_add(&dbs->iov, mem, cur_len);
155 dbs->sg_cur_byte += cur_len;
156 if (dbs->sg_cur_byte == dbs->sg->sg[dbs->sg_cur_index].len) {
157 dbs->sg_cur_byte = 0;
158 ++dbs->sg_cur_index;
159 }
160 }
161
162 if (dbs->iov.size == 0) {
Kevin Wolfc57c4652011-11-24 06:15:28 -0500163 trace_dma_map_wait(dbs);
aliguori59a703e2009-02-05 21:23:58 +0000164 cpu_register_map_client(dbs, continue_after_map_failure);
165 return;
166 }
167
Kevin Wolf58f423f2014-07-09 19:17:30 +0200168 if (dbs->iov.size & ~BDRV_SECTOR_MASK) {
169 qemu_iovec_discard_back(&dbs->iov, dbs->iov.size & ~BDRV_SECTOR_MASK);
170 }
171
Markus Armbruster4be74632014-10-07 13:59:18 +0200172 dbs->acb = dbs->io_func(dbs->blk, dbs->sector_num, &dbs->iov,
173 dbs->iov.size / 512, dma_blk_cb, dbs);
Paolo Bonzini6bee44e2011-11-14 17:50:52 +0100174 assert(dbs->acb);
aliguori59a703e2009-02-05 21:23:58 +0000175}
176
Markus Armbruster7c84b1b2014-10-07 13:59:14 +0200177static void dma_aio_cancel(BlockAIOCB *acb)
Christoph Hellwigc16b5a22009-05-25 12:37:32 +0200178{
179 DMAAIOCB *dbs = container_of(acb, DMAAIOCB, common);
180
Kevin Wolfc57c4652011-11-24 06:15:28 -0500181 trace_dma_aio_cancel(dbs);
182
Christoph Hellwigc16b5a22009-05-25 12:37:32 +0200183 if (dbs->acb) {
Markus Armbruster4be74632014-10-07 13:59:18 +0200184 blk_aio_cancel_async(dbs->acb);
Christoph Hellwigc16b5a22009-05-25 12:37:32 +0200185 }
186}
187
Fam Zheng9bb9da42014-09-11 13:41:14 +0800188
Stefan Hajnoczid7331be2012-10-31 16:34:37 +0100189static const AIOCBInfo dma_aiocb_info = {
Christoph Hellwigc16b5a22009-05-25 12:37:32 +0200190 .aiocb_size = sizeof(DMAAIOCB),
Fam Zheng9bb9da42014-09-11 13:41:14 +0800191 .cancel_async = dma_aio_cancel,
Christoph Hellwigc16b5a22009-05-25 12:37:32 +0200192};
193
Markus Armbruster4be74632014-10-07 13:59:18 +0200194BlockAIOCB *dma_blk_io(
195 BlockBackend *blk, QEMUSGList *sg, uint64_t sector_num,
Markus Armbruster097310b2014-10-07 13:59:15 +0200196 DMAIOFunc *io_func, BlockCompletionFunc *cb,
David Gibson43cf8ae2012-03-27 13:42:23 +1100197 void *opaque, DMADirection dir)
aliguori59a703e2009-02-05 21:23:58 +0000198{
Markus Armbruster4be74632014-10-07 13:59:18 +0200199 DMAAIOCB *dbs = blk_aio_get(&dma_aiocb_info, blk, cb, opaque);
aliguori59a703e2009-02-05 21:23:58 +0000200
Markus Armbruster4be74632014-10-07 13:59:18 +0200201 trace_dma_blk_io(dbs, blk, sector_num, (dir == DMA_DIRECTION_TO_DEVICE));
Kevin Wolfc57c4652011-11-24 06:15:28 -0500202
aliguori37b78422009-03-20 18:26:16 +0000203 dbs->acb = NULL;
Markus Armbruster4be74632014-10-07 13:59:18 +0200204 dbs->blk = blk;
aliguori59a703e2009-02-05 21:23:58 +0000205 dbs->sg = sg;
206 dbs->sector_num = sector_num;
207 dbs->sg_cur_index = 0;
208 dbs->sg_cur_byte = 0;
David Gibson43cf8ae2012-03-27 13:42:23 +1100209 dbs->dir = dir;
Christoph Hellwigcb144cc2011-05-19 10:57:59 +0200210 dbs->io_func = io_func;
aliguori59a703e2009-02-05 21:23:58 +0000211 dbs->bh = NULL;
212 qemu_iovec_init(&dbs->iov, sg->nsg);
Markus Armbruster4be74632014-10-07 13:59:18 +0200213 dma_blk_cb(dbs, 0);
aliguori37b78422009-03-20 18:26:16 +0000214 return &dbs->common;
aliguori59a703e2009-02-05 21:23:58 +0000215}
216
217
Markus Armbruster4be74632014-10-07 13:59:18 +0200218BlockAIOCB *dma_blk_read(BlockBackend *blk,
219 QEMUSGList *sg, uint64_t sector,
220 void (*cb)(void *opaque, int ret), void *opaque)
221{
222 return dma_blk_io(blk, sg, sector, blk_aio_readv, cb, opaque,
223 DMA_DIRECTION_FROM_DEVICE);
224}
225
226BlockAIOCB *dma_blk_write(BlockBackend *blk,
Markus Armbruster7c84b1b2014-10-07 13:59:14 +0200227 QEMUSGList *sg, uint64_t sector,
228 void (*cb)(void *opaque, int ret), void *opaque)
aliguori59a703e2009-02-05 21:23:58 +0000229{
Markus Armbruster4be74632014-10-07 13:59:18 +0200230 return dma_blk_io(blk, sg, sector, blk_aio_writev, cb, opaque,
231 DMA_DIRECTION_TO_DEVICE);
aliguori59a703e2009-02-05 21:23:58 +0000232}
Paolo Bonzini8171ee32011-07-06 08:02:14 +0200233
234
David Gibsonc65bcef2012-06-27 14:50:40 +1000235static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg,
236 DMADirection dir)
Paolo Bonzini8171ee32011-07-06 08:02:14 +0200237{
238 uint64_t resid;
239 int sg_cur_index;
240
241 resid = sg->size;
242 sg_cur_index = 0;
243 len = MIN(len, resid);
244 while (len > 0) {
245 ScatterGatherEntry entry = sg->sg[sg_cur_index++];
246 int32_t xfer = MIN(len, entry.len);
Paolo Bonzinidf32fd12013-04-10 18:15:49 +0200247 dma_memory_rw(sg->as, entry.base, ptr, xfer, dir);
Paolo Bonzini8171ee32011-07-06 08:02:14 +0200248 ptr += xfer;
249 len -= xfer;
250 resid -= xfer;
251 }
252
253 return resid;
254}
255
256uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg)
257{
David Gibsonc65bcef2012-06-27 14:50:40 +1000258 return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE);
Paolo Bonzini8171ee32011-07-06 08:02:14 +0200259}
260
261uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg)
262{
David Gibsonc65bcef2012-06-27 14:50:40 +1000263 return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE);
Paolo Bonzini8171ee32011-07-06 08:02:14 +0200264}
Paolo Bonzini84a69352011-09-05 14:20:29 +0200265
Markus Armbruster4be74632014-10-07 13:59:18 +0200266void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie,
Paolo Bonzini84a69352011-09-05 14:20:29 +0200267 QEMUSGList *sg, enum BlockAcctType type)
268{
Markus Armbruster4be74632014-10-07 13:59:18 +0200269 block_acct_start(blk_get_stats(blk), cookie, sg->size, type);
Paolo Bonzini84a69352011-09-05 14:20:29 +0200270}