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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] arm/acpi: Parse MADT to map logical cpu to MPIDR and get cpu_possible_map
commit b9db1e867375f4c2e2084784164760c36a7da85f
Author: Parth Dixit <parth.dixit@xxxxxxxxxx>
AuthorDate: Wed Mar 2 08:35:00 2016 +0100
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 3 09:05:12 2016 +0100
arm/acpi: Parse MADT to map logical cpu to MPIDR and get cpu_possible_map
MADT contains the information for MPIDR which is essential for SMP
initialization, parse the GIC cpu interface structures to get the MPIDR
value and map it to cpu_logical_map(), and add enabled cpu with valid
MPIDR into cpu_possible_map.
Move BAD_MADT_ENTRY to common place, parenthesize its parameters and
drop the pointer cast.
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
Signed-off-by: Naresh Bhat <naresh.bhat@xxxxxxxxxx>
Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/arm/acpi/boot.c | 121 +++++++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/acpi/boot.c | 4 --
xen/include/asm-arm/acpi.h | 1 +
xen/include/xen/acpi.h | 4 ++
4 files changed, 126 insertions(+), 4 deletions(-)
diff --git a/xen/arch/arm/acpi/boot.c b/xen/arch/arm/acpi/boot.c
index 6b33fbe..e9321c6 100644
--- a/xen/arch/arm/acpi/boot.c
+++ b/xen/arch/arm/acpi/boot.c
@@ -32,6 +32,127 @@
#include <xen/mm.h>
#include <asm/acpi.h>
+#include <asm/smp.h>
+
+/* Processors with enabled flag and sane MPIDR */
+static unsigned int enabled_cpus;
+
+/* total number of cpus in this system */
+static unsigned int __initdata total_cpus;
+
+/*
+ * acpi_map_gic_cpu_interface - generates a logical cpu number
+ * and map to MPIDR represented by GICC structure
+ */
+static void __init
+acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
+{
+ int i;
+ u64 mpidr = processor->arm_mpidr & MPIDR_HWID_MASK;
+ bool_t enabled = !!(processor->flags & ACPI_MADT_ENABLED);
+
+ if ( mpidr == MPIDR_INVALID )
+ {
+ printk("Skip MADT cpu entry with invalid MPIDR\n");
+ return;
+ }
+
+ total_cpus++;
+ if ( !enabled )
+ return;
+
+ if ( enabled_cpus >= NR_CPUS )
+ {
+ printk("NR_CPUS limit of %d reached, Processor %d/0x%"PRIx64"
ignored.\n",
+ NR_CPUS, total_cpus, mpidr);
+ return;
+ }
+
+ /* Check if GICC structure of boot CPU is available in the MADT */
+ if ( (enabled_cpus == 0) && (cpu_logical_map(0) != mpidr) )
+ {
+ printk("Firmware bug, invalid CPU MPIDR for cpu0: 0x%"PRIx64" in
MADT\n",
+ mpidr);
+ return;
+ }
+
+ /*
+ * Duplicate MPIDRs are a recipe for disaster. Scan
+ * all initialized entries and check for
+ * duplicates. If any is found just ignore the CPU.
+ */
+ for ( i = 0; i < enabled_cpus; i++ )
+ {
+ if ( cpu_logical_map(i) == mpidr )
+ {
+ printk("Firmware bug, duplicate CPU MPIDR: 0x%"PRIx64" in MADT\n",
+ mpidr);
+ return;
+ }
+ }
+
+ if ( !acpi_psci_present() )
+ return;
+
+ /* CPU 0 was already initialized */
+ if ( enabled_cpus )
+ {
+ if ( arch_cpu_init(enabled_cpus, NULL) < 0 )
+ return;
+
+ /* map the logical cpu id to cpu MPIDR */
+ cpu_logical_map(enabled_cpus) = mpidr;
+ }
+
+ enabled_cpus++;
+}
+
+static int __init
+acpi_parse_gic_cpu_interface(struct acpi_subtable_header *header,
+ const unsigned long end)
+{
+ struct acpi_madt_generic_interrupt *processor =
+ container_of(header, struct acpi_madt_generic_interrupt,
header);
+
+ if ( BAD_MADT_ENTRY(processor, end) )
+ return -EINVAL;
+
+ acpi_table_print_madt_entry(header);
+ acpi_map_gic_cpu_interface(processor);
+ return 0;
+}
+
+/* Parse GIC cpu interface entries in MADT for SMP init */
+void __init acpi_smp_init_cpus(void)
+{
+ int count, i;
+
+ /*
+ * do a partial walk of MADT to determine how many CPUs
+ * we have including disabled CPUs, and get information
+ * we need for SMP init
+ */
+ count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
+ acpi_parse_gic_cpu_interface, 0);
+
+ if ( count <= 0 )
+ {
+ printk("Error parsing GIC CPU interface entry\n");
+ return;
+ }
+
+ if ( enabled_cpus > 1 )
+ {
+ printk("MADT missing boot CPU MPIDR, not enabling secondaries\n");
+ return;
+ }
+
+ for ( i = 0; i < enabled_cpus; i++ )
+ cpumask_set_cpu(i, &cpu_possible_map);
+
+ /* Make boot-up look pretty */
+ printk("%d CPUs enabled, %d CPUs total\n", enabled_cpus, total_cpus);
+}
static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
diff --git a/xen/arch/x86/acpi/boot.c b/xen/arch/x86/acpi/boot.c
index fac36c6..385c0be 100644
--- a/xen/arch/x86/acpi/boot.c
+++ b/xen/arch/x86/acpi/boot.c
@@ -43,10 +43,6 @@
#include <mach_apic.h>
#include <mach_mpparse.h>
-#define BAD_MADT_ENTRY(entry, end) ( \
- (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
- ((struct acpi_subtable_header *)entry)->length !=
sizeof(*entry))
-
#define PREFIX "ACPI: "
bool_t __initdata acpi_noirq; /* skip ACPI IRQ initialization */
diff --git a/xen/include/asm-arm/acpi.h b/xen/include/asm-arm/acpi.h
index 48d8556..7f59761 100644
--- a/xen/include/asm-arm/acpi.h
+++ b/xen/include/asm-arm/acpi.h
@@ -44,6 +44,7 @@ typedef enum {
bool_t __init acpi_psci_present(void);
bool_t __init acpi_psci_hvc_present(void);
+void __init acpi_smp_init_cpus(void);
#ifdef CONFIG_ACPI
extern bool_t acpi_disabled;
diff --git a/xen/include/xen/acpi.h b/xen/include/xen/acpi.h
index 6633414..31a6918 100644
--- a/xen/include/xen/acpi.h
+++ b/xen/include/xen/acpi.h
@@ -45,6 +45,10 @@
*/
#define NUM_FIXMAP_ACPI_PAGES 4
+#define BAD_MADT_ENTRY(entry, end) ( \
+ (!(entry)) || (unsigned long)(entry) + sizeof(*(entry)) >
(end) || \
+ (entry)->header.length < sizeof(*(entry)))
+
#ifdef CONFIG_ACPI_BOOT
enum acpi_interrupt_id {
--
generated by git-patchbot for /home/xen/git/xen.git#master
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