[mips] [vm] restore translation of freelist to flind for page allocation

Commit r326346 moved domain iterators from physical layer to vm_page one,
but it also removed translation of freelist to flind for
vm_page_alloc_freelist() call. Before it expects VM_FREELIST_ parameter,
but after it expect freelist index.

On small WiFi boxes with few megabytes of RAM, there is only one freelist
VM_FREELIST_LOWMEM (1) and there is no VM_FREELIST_DEFAULT(0) (see file
sys/mips/include/vmparam.h). It results in freelist 1 with flind 0.

At first, this commit renames flind to freelist in vm_page_alloc_freelist
to avoid misunderstanding about input parameters. Then on physical layer it
restores translation for correct handling of freelist parameter.

Reported by:	landonf
Reviewed by:	jeff
Differential Revision:	https://reviews.freebsd.org/D13351

2 files changed, 15 insertions, 10 deletions

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index 4711af9d16de..0397dfef4575 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -2043,7 +2043,7 @@ vm_page_alloc_check(vm_page_t m)
  *	VM_ALLOC_ZERO		prefer a zeroed page
  */
 vm_page_t
-vm_page_alloc_freelist(int flind, int req)
+vm_page_alloc_freelist(int freelist, int req)
 {
 	struct vm_domain_iterator vi;
 	vm_page_t m;
@@ -2056,7 +2056,7 @@ vm_page_alloc_freelist(int flind, int req)
 	while (vm_domain_iterator_run(&vi, &domain) == 0) {
 		if (vm_domain_iterator_isdone(&vi))
 			req |= wait;
-		m = vm_page_alloc_freelist_domain(domain, flind, req);
+		m = vm_page_alloc_freelist_domain(domain, freelist, req);
 		if (m != NULL)
 			break;
 	}
@@ -2066,7 +2066,7 @@ vm_page_alloc_freelist(int flind, int req)
 }
 
 vm_page_t
-vm_page_alloc_freelist_domain(int domain, int flind, int req)
+vm_page_alloc_freelist_domain(int domain, int freelist, int req)
 {
 	vm_page_t m;
 	u_int flags, free_count;
@@ -2090,7 +2090,7 @@ again:
 	    vm_cnt.v_free_count > vm_cnt.v_interrupt_free_min) ||
 	    (req_class == VM_ALLOC_INTERRUPT &&
 	    vm_cnt.v_free_count > 0))
-		m = vm_phys_alloc_freelist_pages(domain, flind,
+		m = vm_phys_alloc_freelist_pages(domain, freelist,
 		    VM_FREEPOOL_DIRECT, 0);
 	if (m == NULL) {
 		if (vm_page_alloc_fail(NULL, req))
diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
index 2bfaf92f0234..4f115153d5eb 100644
--- a/sys/vm/vm_phys.c
+++ b/sys/vm/vm_phys.c
@@ -603,10 +603,10 @@ vm_page_t
 vm_phys_alloc_pages(int domain, int pool, int order)
 {
 	vm_page_t m;
-	int flind;
+	int freelist;
 
-	for (flind = 0; flind < vm_nfreelists; flind++) {
-		m = vm_phys_alloc_freelist_pages(domain, flind, pool, order);
+	for (freelist = 0; freelist < VM_NFREELIST; freelist++) {
+		m = vm_phys_alloc_freelist_pages(domain, freelist, pool, order);
 		if (m != NULL)
 			return (m);
 	}
@@ -621,16 +621,16 @@ vm_phys_alloc_pages(int domain, int pool, int order)
  * The free page queues must be locked.
  */
 vm_page_t
-vm_phys_alloc_freelist_pages(int domain, int flind, int pool, int order)
+vm_phys_alloc_freelist_pages(int domain, int freelist, int pool, int order)
 {
 	struct vm_freelist *alt, *fl;
 	vm_page_t m;
-	int oind, pind;
+	int oind, pind, flind;
 
 	KASSERT(domain >= 0 && domain < vm_ndomains,
 	    ("vm_phys_alloc_freelist_pages: domain %d is out of range",
 	    domain));
-	KASSERT(flind < VM_NFREELIST,
+	KASSERT(freelist < VM_NFREELIST,
 	    ("vm_phys_alloc_freelist_pages: freelist %d is out of range",
 	    flind));
 	KASSERT(pool < VM_NFREEPOOL,
@@ -638,6 +638,11 @@ vm_phys_alloc_freelist_pages(int domain, int flind, int pool, int order)
 	KASSERT(order < VM_NFREEORDER,
 	    ("vm_phys_alloc_freelist_pages: order %d is out of range", order));
 
+	flind = vm_freelist_to_flind[freelist];
+	/* Check if freelist is present */
+	if (flind < 0)
+		return (NULL);
+
 	mtx_assert(&vm_page_queue_free_mtx, MA_OWNED);
 	fl = &vm_phys_free_queues[domain][flind][pool][0];
 	for (oind = order; oind < VM_NFREEORDER; oind++) {