1 | #include "qemu/osdep.h" |
2 | #include "qemu/units.h" |
3 | #include "qemu/bswap.h" |
4 | #include "hw/scsi/emulation.h" |
5 | |
6 | int scsi_emulate_block_limits(uint8_t *outbuf, const SCSIBlockLimits *bl) |
7 | { |
8 | /* required VPD size with unmap support */ |
9 | memset(outbuf, 0, 0x3c); |
10 | |
11 | outbuf[0] = bl->wsnz; /* wsnz */ |
12 | |
13 | if (bl->max_io_sectors) { |
14 | /* optimal transfer length granularity. This field and the optimal |
15 | * transfer length can't be greater than maximum transfer length. |
16 | */ |
17 | stw_be_p(outbuf + 2, MIN(bl->min_io_size, bl->max_io_sectors)); |
18 | |
19 | /* maximum transfer length */ |
20 | stl_be_p(outbuf + 4, bl->max_io_sectors); |
21 | |
22 | /* optimal transfer length */ |
23 | stl_be_p(outbuf + 8, MIN(bl->opt_io_size, bl->max_io_sectors)); |
24 | } else { |
25 | stw_be_p(outbuf + 2, bl->min_io_size); |
26 | stl_be_p(outbuf + 8, bl->opt_io_size); |
27 | } |
28 | |
29 | /* max unmap LBA count */ |
30 | stl_be_p(outbuf + 16, bl->max_unmap_sectors); |
31 | |
32 | /* max unmap descriptors */ |
33 | stl_be_p(outbuf + 20, bl->max_unmap_descr); |
34 | |
35 | /* optimal unmap granularity; alignment is zero */ |
36 | stl_be_p(outbuf + 24, bl->unmap_sectors); |
37 | |
38 | /* max write same size, make it the same as maximum transfer length */ |
39 | stl_be_p(outbuf + 36, bl->max_io_sectors); |
40 | |
41 | return 0x3c; |
42 | } |
43 | |