LXR qemu/hw/scsi/emulation.c

   1#include "qemu/osdep.h"
   2#include "qemu/units.h"
   3#include "qemu/bswap.h"
   4#include "hw/scsi/emulation.h"
   5
   6int 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