Merge tag 'pull-request-2022-09-28' of https://gitlab.com/thuth/qemu into staging
[qemu.git] / hw / usb / libhw.c
1 /*
2 * QEMU USB emulation, libhw bits.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 * THE SOFTWARE.
21 */
22 #include "qemu/osdep.h"
23 #include "hw/usb.h"
24 #include "sysemu/dma.h"
25
26 int usb_packet_map(USBPacket *p, QEMUSGList *sgl)
27 {
28 DMADirection dir = (p->pid == USB_TOKEN_IN) ?
29 DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
30 void *mem;
31 int i;
32
33 for (i = 0; i < sgl->nsg; i++) {
34 dma_addr_t base = sgl->sg[i].base;
35 dma_addr_t len = sgl->sg[i].len;
36
37 while (len) {
38 dma_addr_t xlen = len;
39 mem = dma_memory_map(sgl->as, base, &xlen, dir,
40 MEMTXATTRS_UNSPECIFIED);
41 if (!mem) {
42 goto err;
43 }
44 if (xlen > len) {
45 xlen = len;
46 }
47 qemu_iovec_add(&p->iov, mem, xlen);
48 len -= xlen;
49 base += xlen;
50 }
51 }
52 return 0;
53
54 err:
55 usb_packet_unmap(p, sgl);
56 return -1;
57 }
58
59 void usb_packet_unmap(USBPacket *p, QEMUSGList *sgl)
60 {
61 DMADirection dir = (p->pid == USB_TOKEN_IN) ?
62 DMA_DIRECTION_FROM_DEVICE : DMA_DIRECTION_TO_DEVICE;
63 int i;
64
65 for (i = 0; i < p->iov.niov; i++) {
66 dma_memory_unmap(sgl->as, p->iov.iov[i].iov_base,
67 p->iov.iov[i].iov_len, dir,
68 p->iov.iov[i].iov_len);
69 }
70 }