| 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 | } |