int xc_tbuf_enable(xc_interface *xch, unsigned long pages, unsigned long *mfn,
unsigned long *size)
{
DECLARE_SYSCTL;
int rc;
/*
* Ignore errors (at least for now) as we get an error if size is already
* set (since trace buffers cannot be reallocated). If we really have no
* buffers at all then tbuf_enable() will fail, so this is safe.
*/
(void)xc_tbuf_set_size(xch, pages);
if ( tbuf_enable(xch, 1) != 0 )
return -1;
sysctl.cmd = XEN_SYSCTL_tbuf_op;
sysctl.interface_version = XEN_SYSCTL_INTERFACE_VERSION;
sysctl.u.tbuf_op.cmd = XEN_SYSCTL_TBUFOP_get_info;
rc = xc_sysctl(xch, &sysctl);
if ( rc == 0 )
{
*size = sysctl.u.tbuf_op.size;
*mfn = sysctl.u.tbuf_op.buffer_mfn;
}
return 0;
}
int xc_tbuf_disable(xc_interface *xch)
{
return tbuf_enable(xch, 0);
}
int xc_tbuf_disable(int xc_handle)
{
return tbuf_enable(xc_handle, 0);
}
