Create some global domainsets and refactor NUMA registration.

Pre-defined policies are useful when integrating the domainset(9)
policy machinery into various kernel memory allocators.

The refactoring will make it easier to add NUMA support for other
architectures.

No functional change intended.

Reviewed by:	alc, gallatin, jeff, kib
Tested by:	pho (part of a larger patch)
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17416

share/man/man9/domainset.9

@@ -24,14 +24,11 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd March 24, 2018
+.Dd October 20, 2018
 .Dt DOMAINSET 9
 .Os
 .Sh NAME
 .Nm domainset(9)
-\(em
-.Nm domainset_create ,
-.Nm sysctl_handle_domainset .
 .Nd domainset functions and operation
 .Sh SYNOPSIS
 .In sys/_domainset.h
@@ -46,6 +43,8 @@ struct domainset {
 };
 .Ed
 .Pp
+.Fn DOMAINSET_RR
+.Fn DOMAINSET_PREF domain
 .Ft struct domainset *
 .Fn domainset_create "const struct domainset *key"
 .Ft int
@@ -99,6 +98,12 @@ efficiency higher and is preferential to round-robin for general use.
 .El
 .Pp
 The
+.Fn DOMAINSET_RR
+and
+.Fn DOMAINSET_PREF
+provide pointers to global pre-defined policies for use when the
+desired policy is known at compile time.
+The
 .Fn domainset_create
 function takes a partially filled in domainset as a key and returns a
 valid domainset or NULL.

sys/kern/kern_cpuset.c

@@ -119,6 +119,8 @@ __FBSDID("$FreeBSD$");
  */
 
 LIST_HEAD(domainlist, domainset);
+struct domainset __read_mostly domainset_prefer[MAXMEMDOM];
+struct domainset __read_mostly domainset_roundrobin;
 
 static uma_zone_t cpuset_zone;
 static uma_zone_t domainset_zone;
@@ -1368,6 +1370,31 @@ cpuset_setithread(lwpid_t id, int cpu)
 	return _cpuset_setthread(id, &mask, NULL);
 }
 
+/*
+ * Initialize static domainsets after NUMA information is available.  This is
+ * called very early during boot.
+ */
+void
+domainset_init(void)
+{
+	struct domainset *dset;
+	int i;
+
+	dset = &domainset_roundrobin;
+	DOMAINSET_COPY(&all_domains, &dset->ds_mask);
+	dset->ds_policy = DOMAINSET_POLICY_ROUNDROBIN;
+	dset->ds_prefer = -1;
+	_domainset_create(dset, NULL);
+
+	for (i = 0; i < vm_ndomains; i++) {
+		dset = &domainset_prefer[i];
+		DOMAINSET_COPY(&all_domains, &dset->ds_mask);
+		dset->ds_policy = DOMAINSET_POLICY_PREFER;
+		dset->ds_prefer = i;
+		_domainset_create(dset, NULL);
+	}
+}
+
 /*
  * Create the domainset for cpuset 0, 1 and cpuset 2.
  */
@@ -1375,22 +1402,22 @@ void
 domainset_zero(void)
 {
 	struct domainset *dset;
-	int i;
 
 	mtx_init(&cpuset_lock, "cpuset", NULL, MTX_SPIN | MTX_RECURSE);
 
 	dset = &domainset0;
-	DOMAINSET_ZERO(&dset->ds_mask);
-	for (i = 0; i < vm_ndomains; i++)
-		DOMAINSET_SET(i, &dset->ds_mask);
+	DOMAINSET_COPY(&all_domains, &dset->ds_mask);
 	dset->ds_policy = DOMAINSET_POLICY_FIRSTTOUCH;
 	dset->ds_prefer = -1;
-	(void)domainset_empty_vm(dset);
 	curthread->td_domain.dr_policy = _domainset_create(dset, NULL);
 
 	domainset_copy(dset, &domainset2);
 	domainset2.ds_policy = DOMAINSET_POLICY_INTERLEAVE;
 	kernel_object->domain.dr_policy = _domainset_create(&domainset2, NULL);
+
+	/* Remove empty domains from the global policies. */
+	LIST_FOREACH(dset, &cpuset_domains, ds_link)
+		(void)domainset_empty_vm(dset);
 }
 
 /*

sys/sys/domainset.h

@@ -32,8 +32,8 @@
 #define	_SYS_DOMAINSET_H_
 
 #include <sys/_domainset.h>
-
 #include <sys/bitset.h>
+#include <sys/queue.h>
 
 #define	_NDOMAINSETBITS			_BITSET_BITS
 #define	_NDOMAINSETWORDS		__bitset_words(DOMAINSET_SETSIZE)
@@ -96,6 +96,12 @@ struct domainset {
 	domainid_t	ds_order[MAXMEMDOM];  /* nth domain table. */
 };
 
+extern struct domainset domainset_prefer[MAXMEMDOM];
+#define	DOMAINSET_PREF(domain)	(&domainset_prefer[(domain)])
+extern struct domainset domainset_roundrobin;
+#define	DOMAINSET_RR()		(&domainset_roundrobin)
+
+void domainset_init(void);
 void domainset_zero(void);
 
 /*

sys/vm/vm_phys.c

@@ -46,6 +46,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/domainset.h>
 #include <sys/lock.h>
 #include <sys/kernel.h>
 #include <sys/malloc.h>
@@ -586,6 +587,33 @@ vm_phys_init(void)
 	rw_init(&vm_phys_fictitious_reg_lock, "vmfctr");
 }
 
+/*
+ * Register info about the NUMA topology of the system.
+ *
+ * Invoked by platform-dependent code prior to vm_phys_init().
+ */
+void
+vm_phys_register_domains(int ndomains, struct mem_affinity *affinity,
+    int *locality)
+{
+#ifdef NUMA
+	int i;
+
+	vm_ndomains = ndomains;
+	mem_affinity = affinity;
+	mem_locality = locality;
+
+	for (i = 0; i < vm_ndomains; i++)
+		DOMAINSET_SET(i, &all_domains);
+
+	domainset_init();
+#else
+	(void)ndomains;
+	(void)affinity;
+	(void)locality;
+#endif
+}
+
 /*
  * Split a contiguous, power of two-sized set of physical pages.
  *

sys/vm/vm_phys.h

@@ -88,6 +88,8 @@ void vm_phys_free_contig(vm_page_t m, u_long npages);
 void vm_phys_free_pages(vm_page_t m, int order);
 void vm_phys_init(void);
 vm_page_t vm_phys_paddr_to_vm_page(vm_paddr_t pa);
+void vm_phys_register_domains(int ndomains, struct mem_affinity *affinity,
+    int *locality);
 vm_page_t vm_phys_scan_contig(int domain, u_long npages, vm_paddr_t low,
     vm_paddr_t high, u_long alignment, vm_paddr_t boundary, int options);
 void vm_phys_set_pool(int pool, vm_page_t m, int order);

sys/x86/acpica/srat.c

@@ -153,10 +153,6 @@ parse_slit(void)
 	acpi_unmap_table(slit);
 	slit = NULL;
 
-#ifdef NUMA
-	/* Tell the VM about it! */
-	mem_locality = vm_locality_table;
-#endif
 	return (0);
 }
 
@@ -481,13 +477,6 @@ parse_srat(void)
 		return (-1);
 	}
 
-#ifdef NUMA
-	vm_ndomains = ndomain;
-	for (int i = 0; i < vm_ndomains; i++)
-		DOMAINSET_SET(i, &all_domains);
-	mem_affinity = mem_info;
-#endif
-
 	return (0);
 }
 
@@ -512,6 +501,7 @@ parse_acpi_tables(void *dummy)
 		return;
 	init_mem_locality();
 	(void)parse_slit();
+	vm_phys_register_domains(ndomain, mem_info, vm_locality_table);
 }
 SYSINIT(parse_acpi_tables, SI_SUB_VM - 1, SI_ORDER_FIRST, parse_acpi_tables,
     NULL);