1*3d4a8bf0SPaolo Bonzini #include "qemu/osdep.h"
2*3d4a8bf0SPaolo Bonzini #include "qemu/units.h"
3*3d4a8bf0SPaolo Bonzini #include "qemu/bswap.h"
4*3d4a8bf0SPaolo Bonzini #include "hw/scsi/emulation.h"
5*3d4a8bf0SPaolo Bonzini
scsi_emulate_block_limits(uint8_t * outbuf,const SCSIBlockLimits * bl)6*3d4a8bf0SPaolo Bonzini int scsi_emulate_block_limits(uint8_t *outbuf, const SCSIBlockLimits *bl)
7*3d4a8bf0SPaolo Bonzini {
8*3d4a8bf0SPaolo Bonzini /* required VPD size with unmap support */
9*3d4a8bf0SPaolo Bonzini memset(outbuf, 0, 0x3c);
10*3d4a8bf0SPaolo Bonzini
11*3d4a8bf0SPaolo Bonzini outbuf[0] = bl->wsnz; /* wsnz */
12*3d4a8bf0SPaolo Bonzini
13*3d4a8bf0SPaolo Bonzini if (bl->max_io_sectors) {
14*3d4a8bf0SPaolo Bonzini /* optimal transfer length granularity. This field and the optimal
15*3d4a8bf0SPaolo Bonzini * transfer length can't be greater than maximum transfer length.
16*3d4a8bf0SPaolo Bonzini */
17*3d4a8bf0SPaolo Bonzini stw_be_p(outbuf + 2, MIN(bl->min_io_size, bl->max_io_sectors));
18*3d4a8bf0SPaolo Bonzini
19*3d4a8bf0SPaolo Bonzini /* maximum transfer length */
20*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 4, bl->max_io_sectors);
21*3d4a8bf0SPaolo Bonzini
22*3d4a8bf0SPaolo Bonzini /* optimal transfer length */
23*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 8, MIN(bl->opt_io_size, bl->max_io_sectors));
24*3d4a8bf0SPaolo Bonzini } else {
25*3d4a8bf0SPaolo Bonzini stw_be_p(outbuf + 2, bl->min_io_size);
26*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 8, bl->opt_io_size);
27*3d4a8bf0SPaolo Bonzini }
28*3d4a8bf0SPaolo Bonzini
29*3d4a8bf0SPaolo Bonzini /* max unmap LBA count */
30*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 16, bl->max_unmap_sectors);
31*3d4a8bf0SPaolo Bonzini
32*3d4a8bf0SPaolo Bonzini /* max unmap descriptors */
33*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 20, bl->max_unmap_descr);
34*3d4a8bf0SPaolo Bonzini
35*3d4a8bf0SPaolo Bonzini /* optimal unmap granularity; alignment is zero */
36*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 24, bl->unmap_sectors);
37*3d4a8bf0SPaolo Bonzini
38*3d4a8bf0SPaolo Bonzini /* max write same size, make it the same as maximum transfer length */
39*3d4a8bf0SPaolo Bonzini stl_be_p(outbuf + 36, bl->max_io_sectors);
40*3d4a8bf0SPaolo Bonzini
41*3d4a8bf0SPaolo Bonzini return 0x3c;
42*3d4a8bf0SPaolo Bonzini }
43