[Xen-devel] [PATCH v3 6/6] ARM: mach-virt: add SMP support using PSCI

[Will Deacon <will.deacon@xxxxxxx>]

This patch adds support for SMP to mach-virt using the PSCI
infrastructure.

Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
---
 arch/arm/mach-virt/Kconfig   |  1 +
 arch/arm/mach-virt/Makefile  |  1 +
 arch/arm/mach-virt/platsmp.c | 58 ++++++++++++++++++++++++++++++++++++++++++++
 arch/arm/mach-virt/virt.c    |  4 +++
 4 files changed, 64 insertions(+)
 create mode 100644 arch/arm/mach-virt/platsmp.c

diff --git a/arch/arm/mach-virt/Kconfig b/arch/arm/mach-virt/Kconfig
index a568a2a..8958f0d 100644
--- a/arch/arm/mach-virt/Kconfig
+++ b/arch/arm/mach-virt/Kconfig
@@ -3,6 +3,7 @@ config ARCH_VIRT
        select ARCH_WANT_OPTIONAL_GPIOLIB
        select ARM_GIC
        select ARM_ARCH_TIMER
+       select ARM_PSCI
        select HAVE_SMP
        select CPU_V7
        select SPARSE_IRQ
diff --git a/arch/arm/mach-virt/Makefile b/arch/arm/mach-virt/Makefile
index 7ddbfa6..042afc1 100644
--- a/arch/arm/mach-virt/Makefile
+++ b/arch/arm/mach-virt/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-y                                  := virt.o
+obj-$(CONFIG_SMP)                      += platsmp.o
diff --git a/arch/arm/mach-virt/platsmp.c b/arch/arm/mach-virt/platsmp.c
new file mode 100644
index 0000000..e358beb
--- /dev/null
+++ b/arch/arm/mach-virt/platsmp.c
@@ -0,0 +1,58 @@
+/*
+ * Dummy Virtual Machine - does what it says on the tin.
+ *
+ * Copyright (C) 2012 ARM Ltd
+ * Author: Will Deacon <will.deacon@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/of.h>
+
+#include <asm/psci.h>
+#include <asm/smp_plat.h>
+#include <asm/hardware/gic.h>
+
+extern void secondary_startup(void);
+
+static void __init virt_smp_init_cpus(void)
+{
+       set_smp_cross_call(gic_raise_softirq);
+}
+
+static void __init virt_smp_prepare_cpus(unsigned int max_cpus)
+{
+}
+
+static int __cpuinit virt_boot_secondary(unsigned int cpu,
+                                        struct task_struct *idle)
+{
+       if (psci_ops.cpu_on)
+               return psci_ops.cpu_on(cpu_logical_map(cpu),
+                                      __pa(secondary_startup));
+       return -ENODEV;
+}
+
+static void __cpuinit virt_secondary_init(unsigned int cpu)
+{
+       gic_secondary_init(0);
+}
+
+struct smp_operations __initdata virt_smp_ops = {
+       .smp_init_cpus          = virt_smp_init_cpus,
+       .smp_prepare_cpus       = virt_smp_prepare_cpus,
+       .smp_secondary_init     = virt_secondary_init,
+       .smp_boot_secondary     = virt_boot_secondary,
+};
diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
index 174b9da..1d0a85a 100644
--- a/arch/arm/mach-virt/virt.c
+++ b/arch/arm/mach-virt/virt.c
@@ -20,6 +20,7 @@
 
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/smp.h>
 
 #include <asm/arch_timer.h>
 #include <asm/hardware/gic.h>
@@ -56,10 +57,13 @@ static struct sys_timer virt_timer = {
        .init = virt_timer_init,
 };
 
+extern struct smp_operations virt_smp_ops;
+
 DT_MACHINE_START(VIRT, "Dummy Virtual Machine")
        .init_irq       = gic_init_irq,
        .handle_irq     = gic_handle_irq,
        .timer          = &virt_timer,
        .init_machine   = virt_init,
+       .smp            = smp_ops(virt_smp_ops),
        .dt_compat      = virt_dt_match,
 MACHINE_END
-- 
1.8.0


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