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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 02/15] xen/arm: basic PSCI support, implement cpu_on and cpu_off
Implement support for ARM Power State Coordination Interface, PSCI in
short. Support only HVC calls.
Changes in v6:
- do not trap SMC after all.
Changes in v5:
- remove duplicate is_initialised = 1 from arch_set_info_guest.
Changes in v3:
- move do_psci_* to psci.c;
- trap SMC;
- return PSCI error codes;
- remove Linux boot procotol from secondary cpus;
- implement cpu_off;
- use register_t as second parameter for arm_psci_fn_t;
- unconditionally reset the guest vcpu context on cpu_on.
Changes in v2:
- set is_initialised in arch_set_info_guest;
- zero vcpu_guest_context before using it.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
xen/arch/arm/Makefile | 1 +
xen/arch/arm/domain_build.c | 2 +-
xen/arch/arm/psci.c | 76 +++++++++++++++++++++++++++++++++++++++++
xen/arch/arm/traps.c | 45 ++++++++++++++++++++++++
xen/include/asm-arm/psci.h | 24 +++++++++++++
xen/include/public/arch-arm.h | 2 +
6 files changed, 149 insertions(+), 1 deletions(-)
create mode 100644 xen/arch/arm/psci.c
create mode 100644 xen/include/asm-arm/psci.h
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 2106a4f..8f75044 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -5,6 +5,7 @@ subdir-y += platforms
obj-y += early_printk.o
obj-y += cpu.o
obj-y += domain.o
+obj-y += psci.o
obj-y += domctl.o
obj-y += sysctl.o
obj-y += domain_build.o
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 17aadcf..1b2a4fa 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -419,7 +419,7 @@ int construct_dom0(struct domain *d)
regs->pc = (uint32_t)kinfo.entry;
- regs->cpsr = PSR_ABT_MASK|PSR_FIQ_MASK|PSR_IRQ_MASK|PSR_MODE_SVC;
+ regs->cpsr = PSR_GUEST_INIT;
#ifdef CONFIG_ARM_64
d->arch.type = kinfo.type;
diff --git a/xen/arch/arm/psci.c b/xen/arch/arm/psci.c
new file mode 100644
index 0000000..562ef0b
--- /dev/null
+++ b/xen/arch/arm/psci.c
@@ -0,0 +1,76 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <xen/errno.h>
+#include <xen/sched.h>
+#include <xen/types.h>
+
+#include <asm/current.h>
+#include <asm/psci.h>
+
+int do_psci_cpu_on(uint32_t vcpuid, register_t entry_point)
+{
+ struct vcpu *v;
+ struct domain *d = current->domain;
+ struct vcpu_guest_context *ctxt;
+ int rc;
+
+ if ( (vcpuid < 0) || (vcpuid >= MAX_VIRT_CPUS) )
+ return PSCI_EINVAL;
+
+ if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
+ return PSCI_EINVAL;
+
+ if ( (ctxt = alloc_vcpu_guest_context()) == NULL )
+ return PSCI_DENIED;
+
+ memset(ctxt, 0, sizeof(*ctxt));
+ ctxt->user_regs.pc64 = (u64) entry_point;
+ ctxt->sctlr = SCTLR_BASE;
+ ctxt->ttbr0 = 0;
+ ctxt->ttbr1 = 0;
+ ctxt->ttbcr = 0; /* Defined Reset Value */
+ ctxt->user_regs.cpsr = PSR_GUEST_INIT;
+ ctxt->flags = VGCF_online;
+
+ domain_lock(d);
+ rc = arch_set_info_guest(v, ctxt);
+ free_vcpu_guest_context(ctxt);
+
+ if ( rc < 0 )
+ {
+ domain_unlock(d);
+ return PSCI_DENIED;
+ }
+ domain_unlock(d);
+
+ vcpu_wake(v);
+
+ return PSCI_SUCCESS;
+}
+
+int do_psci_cpu_off(uint32_t power_state)
+{
+ struct vcpu *v = current;
+ if ( !test_and_set_bit(_VPF_down, &v->pause_flags) )
+ vcpu_sleep_nosync(v);
+ return PSCI_SUCCESS;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 55cbb90..c743f2c 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -34,6 +34,7 @@
#include <asm/event.h>
#include <asm/regs.h>
#include <asm/cpregs.h>
+#include <asm/psci.h>
#include "io.h"
#include "vtimer.h"
@@ -666,6 +667,29 @@ static arm_hypercall_t arm_hypercall_table[] = {
HYPERCALL(grant_table_op, 3),
};
+#define __PSCI_cpu_suspend 0
+#define __PSCI_cpu_off 1
+#define __PSCI_cpu_on 2
+#define __PSCI_migrate 3
+
+typedef int (*arm_psci_fn_t)(uint32_t, register_t);
+
+typedef struct {
+ arm_psci_fn_t fn;
+ int nr_args;
+} arm_psci_t;
+
+#define PSCI(_name, _nr_args) \
+ [ __PSCI_ ## _name ] = { \
+ .fn = (arm_psci_fn_t) &do_psci_ ## _name, \
+ .nr_args = _nr_args, \
+ }
+
+static arm_psci_t arm_psci_table[] = {
+ PSCI(cpu_off, 1),
+ PSCI(cpu_on, 2),
+};
+
static void do_debug_trap(struct cpu_user_regs *regs, unsigned int code)
{
register_t *r;
@@ -695,6 +719,25 @@ static void do_debug_trap(struct cpu_user_regs *regs,
unsigned int code)
}
}
+static void do_trap_psci(struct cpu_user_regs *regs)
+{
+ arm_psci_fn_t psci_call = NULL;
+
+ if ( regs->r0 >= ARRAY_SIZE(arm_psci_table) )
+ {
+ domain_crash_synchronous();
+ return;
+ }
+
+ psci_call = arm_psci_table[regs->r0].fn;
+ if ( psci_call == NULL )
+ {
+ domain_crash_synchronous();
+ return;
+ }
+ regs->r0 = psci_call(regs->r1, regs->r2);
+}
+
static void do_trap_hypercall(struct cpu_user_regs *regs, unsigned long iss)
{
arm_hypercall_fn_t call = NULL;
@@ -1013,6 +1056,8 @@ asmlinkage void do_trap_hypervisor(struct cpu_user_regs
*regs)
case HSR_EC_HVC:
if ( (hsr.iss & 0xff00) == 0xff00 )
return do_debug_trap(regs, hsr.iss & 0x00ff);
+ if ( hsr.iss == 0 )
+ return do_trap_psci(regs);
do_trap_hypercall(regs, hsr.iss);
break;
case HSR_EC_DATA_ABORT_GUEST:
diff --git a/xen/include/asm-arm/psci.h b/xen/include/asm-arm/psci.h
new file mode 100644
index 0000000..8511eb1
--- /dev/null
+++ b/xen/include/asm-arm/psci.h
@@ -0,0 +1,24 @@
+#ifndef __ASM_PSCI_H__
+#define __ASM_PSCI_H__
+
+#define PSCI_SUCCESS 0
+#define PSCI_ENOSYS -1
+#define PSCI_EINVAL -2
+#define PSCI_DENIED -3
+
+int do_psci_cpu_on(uint32_t vcpuid, uint32_t entry_point);
+int do_psci_cpu_off(uint32_t power_state);
+int do_psci_cpu_suspend(uint32_t power_state, uint32_t entry_point);
+int do_psci_migrate(uint32_t vcpuid);
+
+#endif /* __ASM_PSCI_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/public/arch-arm.h b/xen/include/public/arch-arm.h
index cea12b2..8aa62d3 100644
--- a/xen/include/public/arch-arm.h
+++ b/xen/include/public/arch-arm.h
@@ -237,6 +237,8 @@ typedef uint64_t xen_callback_t;
#define PSR_IT_MASK (0x0600fc00) /* Thumb If-Then Mask */
#define PSR_JAZELLE (1<<24) /* Jazelle Mode */
+#define PSR_GUEST_INIT (PSR_ABT_MASK|PSR_FIQ_MASK|PSR_IRQ_MASK|PSR_MODE_SVC)
+
#endif /* __XEN_PUBLIC_ARCH_ARM_H__ */
/*
--
1.7.2.5
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