/*
* Round up number of slabs to the next power of 2. The last area is going
* be smaller than the rest if default_nslabs is not power of two.
+ * The number of slot in an area should be a multiple of IO_TLB_SEGSIZE,
+ * otherwise a segment may span two or more areas. It conflicts with free
+ * contiguous slots tracking: free slots are treated contiguous no matter
+ * whether they cross an area boundary.
*
* Return true if default_nslabs is rounded up.
*/
static bool round_up_default_nslabs(void)
{
- if (!default_nareas || is_power_of_2(default_nslabs))
+ if (!default_nareas)
+ return false;
+
+ if (default_nslabs < IO_TLB_SEGSIZE * default_nareas)
+ default_nslabs = IO_TLB_SEGSIZE * default_nareas;
+ else if (is_power_of_2(default_nslabs))
return false;
default_nslabs = roundup_pow_of_two(default_nslabs);
return true;