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Index: sys/dev/iommu/iommu_gas.c
===================================================================
--- sys/dev/iommu/iommu_gas.c
+++ sys/dev/iommu/iommu_gas.c
@@ -35,6 +35,7 @@
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/counter.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <sys/interrupt.h>
@@ -206,6 +207,11 @@
}
#endif
+static COUNTER_U64_DEFINE_EARLY(gas_total);
+SYSCTL_COUNTER_U64(_hw_iommu, OID_AUTO, gas_total, CTLFLAG_RD,
+ &gas_total,
+ "Sum of gas tree sizes");
+
static void
iommu_gas_rb_remove(struct iommu_domain *domain, struct iommu_map_entry *entry)
{
@@ -304,6 +310,11 @@
struct iommu_map_entry *entry;
};
+static COUNTER_U64_DEFINE_EARLY(gas_lookup);
+SYSCTL_COUNTER_U64(_hw_iommu, OID_AUTO, gas_lookup, CTLFLAG_RD,
+ &gas_lookup,
+ "Number of gas node accesses");
+
/*
* The interval [beg, end) is a free interval between two iommu_map_entries.
* Addresses can be allocated only in the range [lbound, ubound). Try to
@@ -369,6 +380,7 @@
entry->start = start;
entry->end = start + roundup2(size + offset, IOMMU_PAGE_SIZE);
entry->flags = IOMMU_MAP_ENTRY_MAP;
+ counter_u64_add(gas_total, a->domain->entries_cnt);
return (true);
}
@@ -381,15 +393,19 @@
if ((next = RB_RIGHT(curr, rb_entry)) != NULL &&
next->free_down >= min_free) {
/* Find next entry in right subtree. */
- do
+ do {
+ counter_u64_add(gas_lookup, 1);
curr = next;
- while ((next = RB_LEFT(curr, rb_entry)) != NULL &&
+ } while ((next = RB_LEFT(curr, rb_entry)) != NULL &&
next->free_down >= min_free);
} else {
/* Find next entry in a left-parent ancestor. */
while ((next = RB_PARENT(curr, rb_entry)) != NULL &&
- curr == RB_RIGHT(next, rb_entry))
+ curr == RB_RIGHT(next, rb_entry)) {
+ counter_u64_add(gas_lookup, 1);
curr = next;
+ }
+ counter_u64_add(gas_lookup, 1);
curr = next;
}
return (curr);
@@ -421,6 +437,7 @@
curr = RB_ROOT(&domain->rb_root);
first = NULL;
while (curr != NULL && curr->free_down >= min_free) {
+ counter_u64_add(gas_lookup, 1);
first = curr;
curr = RB_LEFT(curr, rb_entry);
}
@@ -458,10 +475,13 @@
* before highaddr that could abut a big-enough range.
*/
addr = a->common->highaddr;
- while (curr != NULL && curr->last < addr)
+ while (curr != NULL && curr->last < addr) {
+ counter_u64_add(gas_lookup, 1);
curr = RB_PARENT(curr, rb_entry);
+ }
first = NULL;
while (curr != NULL && curr->free_down >= min_free) {
+ counter_u64_add(gas_lookup, 1);
if (addr < curr->end)
curr = RB_LEFT(curr, rb_entry);
else {

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