mm/tmem-xen.c

   1 /*
   2  * Xen implementation for transcendent memory (tmem)
   3  *
   4  * Dan Magenheimer <dan.magenheimer@oracle.com> 2009
   5  */
   6
   7 #include <linux/types.h>
   8 #include <xen/interface/xen.h>
   9 #include <asm/hypervisor.h>
  10 #include "tmem.h"
  11
  12 int xen_tmem_op(u32 tmem_cmd, u32 tmem_pool, struct tmem_oid oid, u32 index,
  13         unsigned long gmfn, u32 tmem_offset, u32 pfn_offset, u32 len)
  14 {
  15         struct tmem_op op;
  16         int rc = 0;
  17
  18         op.cmd = tmem_cmd;
  19         op.pool_id = tmem_pool;
  20         BUILD_BUG_ON(sizeof(op.u.gen.oid) != sizeof(oid.oid));
  21         memcpy(op.u.gen.oid, oid.oid, sizeof(op.u.gen.oid));
  22         op.u.gen.index = index;
  23         op.u.gen.tmem_offset = tmem_offset;
  24         op.u.gen.pfn_offset = pfn_offset;
  25         op.u.gen.len = len;
  26         op.u.gen.cmfn = gmfn;
  27         rc = HYPERVISOR_tmem_op(&op);
  28         return rc;
  29 }
  30
  31 int xen_tmem_new_pool(uint32_t tmem_cmd, struct tmem_pool_uuid uuid,
  32         uint32_t flags)
  33 {
  34         struct tmem_op op;
  35         int rc = 0;
  36
  37         op.cmd = tmem_cmd;
  38         op.u.creat.uuid[0] = uuid.lo;
  39         op.u.creat.uuid[1] = uuid.hi;
  40 #ifdef TMEM_SPEC_VERSION
  41         switch (flags >> TMEM_POOL_VERSION_SHIFT) {
  42         case 0:
  43                 flags |= TMEM_SPEC_VERSION << TMEM_POOL_VERSION_SHIFT;
  44                 break;
  45         case TMEM_SPEC_VERSION:
  46                 break;
  47         default:
  48                 WARN(1, "TMEM: Bogus version %u, expecting %u\n",
  49                      flags >> TMEM_POOL_VERSION_SHIFT, TMEM_SPEC_VERSION);
  50                 return -ENOSYS;
  51         }
  52 #endif
  53         op.u.creat.flags = flags;
  54         rc = HYPERVISOR_tmem_op(&op);
  55         return rc;
  56 }