Add a parser for the ACPI SRAT table for amd64 and i386. It sets

PCPU(domain) for each CPU and populates a mem_affinity array suitable
for the NUMA support in the physical memory allocator.

Reviewed by:	alc

1 files changed, 329 insertions, 0 deletions

diff --git a/sys/x86/acpica/srat.c b/sys/x86/acpica/srat.c
new file mode 100644
index 0000000..df15062
--- /dev/null
+++ b/sys/x86/acpica/srat.c
@@ -0,0 +1,329 @@
+/*-
+ * Copyright (c) 2010 Advanced Computing Technologies LLC
+ * Written by: John H. Baldwin <jhb@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/smp.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_param.h>
+#include <vm/vm_phys.h>
+
+#include <contrib/dev/acpica/include/acpi.h>
+#include <contrib/dev/acpica/include/actables.h>
+
+#include <machine/intr_machdep.h>
+#include <machine/apicvar.h>
+
+#include <dev/acpica/acpivar.h>
+
+struct cpu_info {
+	int enabled:1;
+	int has_memory:1;
+	int domain;
+} cpus[MAX_APIC_ID + 1];
+
+struct mem_affinity mem_info[VM_PHYSSEG_MAX + 1];
+int num_mem;
+
+static ACPI_TABLE_SRAT *srat;
+static vm_paddr_t srat_physaddr;
+
+static void	srat_walk_table(acpi_subtable_handler *handler, void *arg);
+
+static void
+srat_parse_entry(ACPI_SUBTABLE_HEADER *entry, void *arg)
+{
+	ACPI_SRAT_CPU_AFFINITY *cpu;
+	ACPI_SRAT_X2APIC_CPU_AFFINITY *x2apic;
+	ACPI_SRAT_MEM_AFFINITY *mem;
+	int domain, i, slot;
+
+	switch (entry->Type) {
+	case ACPI_SRAT_TYPE_CPU_AFFINITY:
+		cpu = (ACPI_SRAT_CPU_AFFINITY *)entry;
+		domain = cpu->ProximityDomainLo |
+		    cpu->ProximityDomainHi[0] << 8 |
+		    cpu->ProximityDomainHi[1] << 16 |
+		    cpu->ProximityDomainHi[2] << 24;
+		if (bootverbose)
+			printf("SRAT: Found CPU APIC ID %u domain %d: %s\n",
+			    cpu->ApicId, domain,
+			    (cpu->Flags & ACPI_SRAT_CPU_ENABLED) ?
+			    "enabled" : "disabled");
+		if (!(cpu->Flags & ACPI_SRAT_CPU_ENABLED))
+			break;
+		KASSERT(!cpus[cpu->ApicId].enabled,
+		    ("Duplicate local APIC ID %u", cpu->ApicId));
+		cpus[cpu->ApicId].domain = domain;
+		cpus[cpu->ApicId].enabled = 1;
+		break;
+	case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
+		x2apic = (ACPI_SRAT_X2APIC_CPU_AFFINITY *)entry;
+		if (bootverbose)
+			printf("SRAT: Found CPU APIC ID %u domain %d: %s\n",
+			    x2apic->ApicId, x2apic->ProximityDomain,
+			    (x2apic->Flags & ACPI_SRAT_CPU_ENABLED) ?
+			    "enabled" : "disabled");
+		if (!(x2apic->Flags & ACPI_SRAT_CPU_ENABLED))
+			break;
+		KASSERT(!cpus[x2apic->ApicId].enabled,
+		    ("Duplicate local APIC ID %u", x2apic->ApicId));
+		cpus[x2apic->ApicId].domain = x2apic->ProximityDomain;
+		cpus[x2apic->ApicId].enabled = 1;
+		break;
+	case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
+		mem = (ACPI_SRAT_MEM_AFFINITY *)entry;
+		if (bootverbose)
+			printf(
+		    "SRAT: Found memory domain %d addr %jx len %jx: %s\n",
+			    mem->ProximityDomain, (uintmax_t)mem->BaseAddress,
+			    (uintmax_t)mem->Length,
+			    (mem->Flags & ACPI_SRAT_MEM_ENABLED) ?
+			    "enabled" : "disabled");
+		if (!(mem->Flags & ACPI_SRAT_MEM_ENABLED))
+			break;
+		if (num_mem == VM_PHYSSEG_MAX) {
+			printf("SRAT: Too many memory regions\n");
+			*(int *)arg = ENXIO;
+			break;
+		}
+		slot = num_mem;
+		for (i = 0; i < num_mem; i++) {
+			if (mem_info[i].end <= mem->BaseAddress)
+				continue;
+			if (mem_info[i].start <
+			    (mem->BaseAddress + mem->Length)) {
+				printf("SRAT: Overlapping memory entries\n");
+				*(int *)arg = ENXIO;
+				return;
+			}
+			slot = i;
+		}
+		for (i = num_mem; i > slot; i--)
+			mem_info[i] = mem_info[i - 1];
+		mem_info[slot].start = mem->BaseAddress;
+		mem_info[slot].end = mem->BaseAddress + mem->Length;
+		mem_info[slot].domain = mem->ProximityDomain;
+		num_mem++;
+		break;
+	}
+}
+
+/*
+ * Ensure each memory domain has at least one CPU and that each CPU
+ * has at least one memory domain.
+ */
+static int
+check_domains(void)
+{
+	int found, i, j;
+
+	for (i = 0; i < num_mem; i++) {
+		found = 0;
+		for (j = 0; j <= MAX_APIC_ID; j++)
+			if (cpus[j].domain == mem_info[i].domain) {
+				cpus[j].has_memory = 1;
+				found++;
+			}
+		if (!found) {
+			printf("SRAT: No CPU found for memory domain %d\n",
+			    mem_info[i].domain);
+			return (ENXIO);
+		}
+	}
+	for (i = 0; i <= MAX_APIC_ID; i++)
+		if (cpus[i].enabled && !cpus[i].has_memory) {
+			printf("SRAT: No memory found for CPU %d\n", i);
+			return (ENXIO);
+		}
+	return (0);
+}
+
+/*
+ * Check that the SRAT memory regions cover all of the regions in
+ * phys_avail[].
+ */
+static int
+check_phys_avail(void)
+{
+	vm_paddr_t address;
+	int i, j;
+
+	/* j is the current offset into phys_avail[]. */
+	address = phys_avail[0];
+	j = 0;
+	for (i = 0; i < num_mem; i++) {
+		/*
+		 * Consume as many phys_avail[] entries as fit in this
+		 * region.
+		 */
+		while (address >= mem_info[i].start &&
+		    address <= mem_info[i].end) {
+			/*
+			 * If we cover the rest of this phys_avail[] entry,
+			 * advance to the next entry.
+			 */
+			if (phys_avail[j + 1] <= mem_info[i].end) {
+				j += 2;
+				if (phys_avail[j] == 0 &&
+				    phys_avail[j + 1] == 0) {
+					return (0);
+				}
+				address = phys_avail[j];
+			} else
+				address = mem_info[i].end + 1;
+		}
+	}
+	printf("SRAT: No memory region found for %jx - %jx\n",
+	    (uintmax_t)phys_avail[j], (uintmax_t)phys_avail[j + 1]);
+	return (ENXIO);
+}
+
+/*
+ * Renumber the memory domains to be compact and zero-based if not
+ * already.
+ */
+static void
+renumber_domains(void)
+{
+	int domains[VM_PHYSSEG_MAX];
+	int ndomain, i, j, slot;
+
+	/* Enumerate all the domains. */
+	ndomain = 0;
+	for (i = 0; i < num_mem; i++) {
+		/* See if this domain is already known. */
+		for (j = 0; j < ndomain; j++) {
+			if (domains[j] >= mem_info[i].domain)
+				break;
+		}
+		if (j < ndomain && domains[j] == mem_info[i].domain)
+			continue;
+
+		/* Insert the new domain at slot 'j'. */
+		slot = j;
+		for (j = ndomain; j > slot; j--)
+			domains[j] = domains[j - 1];
+		domains[slot] = mem_info[i].domain;
+	}
+
+	/* Renumber each domain to its index in the sorted 'domains' list. */
+	for (i = 0; i < ndomain; i++) {
+		/*
+		 * If the domain is already the right value, no need
+		 * to renumber.
+		 */
+		if (domains[i] == i)
+			continue;
+
+		/* Walk the cpu[] and mem_info[] arrays to renumber. */
+		for (j = 0; j < num_mem; j++)
+			if (mem_info[j].domain == domains[i])
+				mem_info[j].domain = i;
+		for (j = 0; j <= MAX_APIC_ID; j++)
+			if (cpus[j].enabled && cpus[j].domain == domains[i])
+				cpus[j].domain = i;
+	}
+}
+
+/*
+ * Look for an ACPI System Resource Affinity Table ("SRAT")
+ */
+static void
+parse_srat(void *dummy)
+{
+	int error;
+
+	if (resource_disabled("srat", 0))
+		return;
+
+	srat_physaddr = acpi_find_table(ACPI_SIG_SRAT);
+	if (srat_physaddr == 0)
+		return;
+
+	/*
+	 * Make a pass over the table to populate the cpus[] and
+	 * mem_info[] tables.
+	 */
+	srat = acpi_map_table(srat_physaddr, ACPI_SIG_SRAT);
+	error = 0;
+	srat_walk_table(srat_parse_entry, &error);
+	acpi_unmap_table(srat);
+	srat = NULL;
+	if (error || check_domains() != 0 || check_phys_avail() != 0) {
+		srat_physaddr = 0;
+		return;
+	}
+
+	renumber_domains();
+
+	/* Point vm_phys at our memory affinity table. */
+	mem_affinity = mem_info;
+}
+SYSINIT(parse_srat, SI_SUB_VM - 1, SI_ORDER_FIRST, parse_srat, NULL);
+
+static void
+srat_walk_table(acpi_subtable_handler *handler, void *arg)
+{
+
+	acpi_walk_subtables(srat + 1, (char *)srat + srat->Header.Length,
+	    handler, arg);
+}
+
+/*
+ * Setup per-CPU ACPI IDs.
+ */
+static void
+srat_set_cpus(void *dummy)
+{
+	struct cpu_info *cpu;
+	struct pcpu *pc;
+	u_int i;
+
+	if (srat_physaddr == 0)
+		return;
+	for (i = 0; i < MAXCPU; i++) {
+		if (CPU_ABSENT(i))
+			continue;
+		pc = pcpu_find(i);
+		KASSERT(pc != NULL, ("no pcpu data for CPU %u", i));
+		cpu = &cpus[pc->pc_apic_id];
+		if (!cpu->enabled)
+			panic("SRAT: CPU with APIC ID %u is not known",
+			    pc->pc_apic_id);
+		pc->pc_domain = cpu->domain;
+		if (bootverbose)
+			printf("SRAT: CPU %u has memory domain %d\n", i,
+			    cpu->domain);
+	}
+}
+SYSINIT(srat_set_cpus, SI_SUB_CPU, SI_ORDER_ANY, srat_set_cpus, NULL);