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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v11] xen/arm : emulation of arm's PSCI v0.2 standard
Arm based virtual machines dom0/guest will request power related functionality
from xen through PSCI interface. This patch implements version 0.2 of
PSCI standard specified by arm for 64bit and 32 bit arm machines.
Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
---
Changelog v11
- fixed arm32 bit compilation error for psci
- corrected grammar in comments in psci_suspend
- Removed coding details about individual function/macro from commit text
Changelog v10
- added new comment in cpu_suspend to reflect
- that current implementation performs standby
Changelog v9
- removed context_id from cpu_suspend
Changelog v8
- fixed error in cpu_suspend
Changelog v7
- removed casting from functions in do_psci_trap
- modified cpu_suspend to return success in case the call returns
Changelog v6
- fixed indentation
- removed casting from error codes
- modified cpu_suspend to check power_state
- ignoring context_id in case of standby
- added comments for ignoring affinity
- added macro for checking power_state
Changelog v5
- removed PSCI_ARGS macro
- preload error value for calls that do not return
- added new macro for 32 bit arguments
- casting return calls to appropriate types
- added new function psci_mode_check
- added error checks for PSCI v0.2 function id's
Changelog v4
- added target_affinity_mask[] to local variable
- removed AFF3 masking for 64 bit cpu
- added do_common_cpu_on for PSCI v0.1 and v0.2
- moved cpu_on decision based on entry point
- removed vpsci_ver introduced in v3
- removed psci tables
- added new macro for selecting arguments
- do_trap_psci is now switch case based instead of tables
Changelog v3
- moved wfi helper to seperate patch
- replaced new wfi function in traps.c
- removed defining power_state variable using value directly
- added new line between declaration
- merged PSCI v0.1 and v0.2 cpu_on function to avoid duplication
- removed spurious change
- renamed PSCI return values to reflect v0.2 moved them to top
- removed PSCI v0.1 version declaration for now, will introduce it when needed
- removed hard tabs in the code lifted from linux
- removed PSCI_0_1_MAX
- did not retained copyright header from linux as most of functions are removed
- added two function tables for PSCI v0.1 and PSCI v0.2
- added compatibility string to libxl_arm to expose new functionality
- refactored affinity_info code
- added table for masking function
- removed definitions of unused PSCI v0.2 functions
- removed function id's of unused PSCI v0.2 functions
- renamed constant PSCI_0_2_TOS_MP ( multicore aware) as per spec
tools/libxl/libxl_arm.c | 2 +-
xen/arch/arm/domain_build.c | 5 +-
xen/arch/arm/traps.c | 127 ++++++++++++++++++++++++++++-----------
xen/arch/arm/vpsci.c | 130 ++++++++++++++++++++++++++++++++++++++--
xen/include/asm-arm/processor.h | 3 +
xen/include/asm-arm/psci.h | 83 ++++++++++++++++++++++---
6 files changed, 300 insertions(+), 50 deletions(-)
diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
index 4f0f0e2..e8bcd05 100644
--- a/tools/libxl/libxl_arm.c
+++ b/tools/libxl/libxl_arm.c
@@ -237,7 +237,7 @@ static int make_psci_node(libxl__gc *gc, void *fdt)
res = fdt_begin_node(fdt, "psci");
if (res) return res;
- res = fdt_property_compat(gc, fdt, 1, "arm,psci");
+ res = fdt_property_compat(gc, fdt, 2, "arm,psci-0.2","arm,psci");
if (res) return res;
res = fdt_property_string(fdt, "method", "hvc");
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index c424793..ebd4170 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -388,6 +388,9 @@ static int make_hypervisor_node(struct domain *d,
static int make_psci_node(void *fdt, const struct dt_device_node *parent)
{
int res;
+ const char compat[] =
+ "arm,psci-0.2""\0"
+ "arm,psci";
DPRINT("Create PSCI node\n");
@@ -396,7 +399,7 @@ static int make_psci_node(void *fdt, const struct
dt_device_node *parent)
if ( res )
return res;
- res = fdt_property_string(fdt, "compatible", "arm,psci");
+ res = fdt_property(fdt, "compatible", compat, sizeof(compat));
if ( res )
return res;
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 8102540..1b6c8b2 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1030,24 +1030,6 @@ static arm_hypercall_t arm_hypercall_table[] = {
HYPERCALL_ARM(vcpu_op, 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),
-};
-
#ifndef NDEBUG
static void do_debug_trap(struct cpu_user_regs *regs, unsigned int code)
{
@@ -1080,33 +1062,108 @@ static void do_debug_trap(struct cpu_user_regs *regs,
unsigned int code)
#endif
#ifdef CONFIG_ARM_64
-#define PSCI_OP_REG(r) (r)->x0
-#define PSCI_RESULT_REG(r) (r)->x0
-#define PSCI_ARGS(r) (r)->x1, (r)->x2
+#define PSCI_RESULT_REG(reg) (reg)->x0
+#define PSCI_ARG(reg,n) (reg)->x##n
+#define PSCI_ARG32(reg,n) (uint32_t)( (reg)->x##n & 0x00000000FFFFFFFF )
#else
-#define PSCI_OP_REG(r) (r)->r0
-#define PSCI_RESULT_REG(r) (r)->r0
-#define PSCI_ARGS(r) (r)->r1, (r)->r2
+#define PSCI_RESULT_REG(reg) (reg)->r0
+#define PSCI_ARG(reg,n) (reg)->r##n
+#define PSCI_ARG32(reg,n) PSCI_ARG(reg,n)
#endif
-static void do_trap_psci(struct cpu_user_regs *regs)
+/* helper function for checking arm mode 32/64 bit */
+static inline int psci_mode_check(struct domain *d, register_t fid)
{
- arm_psci_fn_t psci_call = NULL;
+ return !( is_64bit_domain(d)^( (fid & PSCI_0_2_64BIT) >> 30 ) );
+}
- if ( PSCI_OP_REG(regs) >= ARRAY_SIZE(arm_psci_table) )
- {
- domain_crash_synchronous();
- return;
- }
+static void do_trap_psci(struct cpu_user_regs *regs)
+{
+ register_t fid = PSCI_ARG(regs,0);
- psci_call = arm_psci_table[PSCI_OP_REG(regs)].fn;
- if ( psci_call == NULL )
+ /* preloading in case psci_mode_check fails */
+ PSCI_RESULT_REG(regs) = PSCI_INVALID_PARAMETERS;
+ switch( fid )
{
+ case PSCI_cpu_off:
+ {
+ uint32_t pstate = PSCI_ARG32(regs,1);
+ PSCI_RESULT_REG(regs) = do_psci_cpu_off(pstate);
+ }
+ break;
+ case PSCI_cpu_on:
+ {
+ uint32_t vcpuid = PSCI_ARG32(regs,1);
+ register_t epoint = PSCI_ARG(regs,2);
+ PSCI_RESULT_REG(regs) = do_psci_cpu_on(vcpuid, epoint);
+ }
+ break;
+ case PSCI_0_2_FN_PSCI_VERSION:
+ PSCI_RESULT_REG(regs) = do_psci_0_2_version();
+ break;
+ case PSCI_0_2_FN_CPU_OFF:
+ PSCI_RESULT_REG(regs) = do_psci_0_2_cpu_off();
+ break;
+ case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
+ PSCI_RESULT_REG(regs) = do_psci_0_2_migrate_info_type();
+ break;
+ case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
+ case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
+ if ( psci_mode_check(current->domain, fid) )
+ PSCI_RESULT_REG(regs) = do_psci_0_2_migrate_info_up_cpu();
+ break;
+ case PSCI_0_2_FN_SYSTEM_OFF:
+ do_psci_0_2_system_off();
+ PSCI_RESULT_REG(regs) = PSCI_INTERNAL_FAILURE;
+ break;
+ case PSCI_0_2_FN_SYSTEM_RESET:
+ do_psci_0_2_system_reset();
+ PSCI_RESULT_REG(regs) = PSCI_INTERNAL_FAILURE;
+ break;
+ case PSCI_0_2_FN_CPU_ON:
+ case PSCI_0_2_FN64_CPU_ON:
+ if ( psci_mode_check(current->domain, fid) )
+ {
+ register_t vcpuid = PSCI_ARG(regs,1);
+ register_t epoint = PSCI_ARG(regs,2);
+ register_t cid = PSCI_ARG(regs,3);
+ PSCI_RESULT_REG(regs) =
+ do_psci_0_2_cpu_on(vcpuid, epoint, cid);
+ }
+ break;
+ case PSCI_0_2_FN_CPU_SUSPEND:
+ case PSCI_0_2_FN64_CPU_SUSPEND:
+ if ( psci_mode_check(current->domain, fid) )
+ {
+ uint32_t pstate = PSCI_ARG32(regs,1);
+ register_t epoint = PSCI_ARG(regs,2);
+ register_t cid = PSCI_ARG(regs,3);
+ PSCI_RESULT_REG(regs) =
+ do_psci_0_2_cpu_suspend(pstate, epoint, cid);
+ }
+ break;
+ case PSCI_0_2_FN_AFFINITY_INFO:
+ case PSCI_0_2_FN64_AFFINITY_INFO:
+ if ( psci_mode_check(current->domain, fid) )
+ {
+ register_t taff = PSCI_ARG(regs,1);
+ uint32_t laff = PSCI_ARG32(regs,2);
+ PSCI_RESULT_REG(regs) =
+ do_psci_0_2_affinity_info(taff, laff);
+ }
+ break;
+ case PSCI_0_2_FN_MIGRATE:
+ case PSCI_0_2_FN64_MIGRATE:
+ if ( psci_mode_check(current->domain, fid) )
+ {
+ uint32_t tcpu = PSCI_ARG32(regs,1);
+ PSCI_RESULT_REG(regs) = do_psci_0_2_migrate(tcpu);
+ }
+ break;
+ default:
domain_crash_synchronous();
return;
}
-
- PSCI_RESULT_REG(regs) = psci_call(PSCI_ARGS(regs));
}
#ifdef CONFIG_ARM_64
diff --git a/xen/arch/arm/vpsci.c b/xen/arch/arm/vpsci.c
index 1ceb8cb..c3d2df9 100644
--- a/xen/arch/arm/vpsci.c
+++ b/xen/arch/arm/vpsci.c
@@ -17,24 +17,37 @@
#include <asm/current.h>
#include <asm/gic.h>
#include <asm/psci.h>
+#include <public/sched.h>
+#include <asm-arm/event.h>
-int do_psci_cpu_on(uint32_t vcpuid, register_t entry_point)
+static int do_common_cpu_on(register_t target_cpu, register_t entry_point,
+ register_t context_id,int ver)
{
struct vcpu *v;
struct domain *d = current->domain;
struct vcpu_guest_context *ctxt;
int rc;
int is_thumb = entry_point & 1;
+ register_t vcpuid;
+
+ if( ver == XEN_PSCI_V_0_2 )
+ vcpuid = (target_cpu & MPIDR_HWID_MASK);
+ else
+ vcpuid = target_cpu;
if ( (vcpuid < 0) || (vcpuid >= MAX_VIRT_CPUS) )
- return PSCI_EINVAL;
+ return PSCI_INVALID_PARAMETERS;
if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
- return PSCI_EINVAL;
+ return PSCI_INVALID_PARAMETERS;
/* THUMB set is not allowed with 64-bit domain */
if ( is_64bit_domain(d) && is_thumb )
- return PSCI_EINVAL;
+ return PSCI_INVALID_PARAMETERS;
+
+ if( ( ver == XEN_PSCI_V_0_2 ) &&
+ ( !test_bit(_VPF_down, &v->pause_flags) ) )
+ return PSCI_ALREADY_ON;
if ( (ctxt = alloc_vcpu_guest_context()) == NULL )
return PSCI_DENIED;
@@ -48,10 +61,18 @@ int do_psci_cpu_on(uint32_t vcpuid, register_t entry_point)
ctxt->ttbr1 = 0;
ctxt->ttbcr = 0; /* Defined Reset Value */
if ( is_32bit_domain(d) )
+ {
ctxt->user_regs.cpsr = PSR_GUEST32_INIT;
+ if( ver == XEN_PSCI_V_0_2 )
+ ctxt->user_regs.r0_usr = context_id;
+ }
#ifdef CONFIG_ARM_64
else
+ {
ctxt->user_regs.cpsr = PSR_GUEST64_INIT;
+ if( ver == XEN_PSCI_V_0_2 )
+ ctxt->user_regs.x0 = context_id;
+ }
#endif
/* Start the VCPU with THUMB set if it's requested by the kernel */
@@ -75,7 +96,12 @@ int do_psci_cpu_on(uint32_t vcpuid, register_t entry_point)
return PSCI_SUCCESS;
}
-int do_psci_cpu_off(uint32_t power_state)
+int32_t do_psci_cpu_on(uint32_t vcpuid, register_t entry_point)
+{
+ return do_common_cpu_on(vcpuid,entry_point,0,XEN_PSCI_V_0_1);
+}
+
+int32_t do_psci_cpu_off(uint32_t power_state)
{
struct vcpu *v = current;
if ( !test_and_set_bit(_VPF_down, &v->pause_flags) )
@@ -83,6 +109,100 @@ int do_psci_cpu_off(uint32_t power_state)
return PSCI_SUCCESS;
}
+uint32_t do_psci_0_2_version(void)
+{
+ return XEN_PSCI_V_0_2;
+}
+
+register_t do_psci_0_2_cpu_suspend(uint32_t power_state, register_t
entry_point,
+ register_t context_id)
+{
+ struct vcpu *v = current;
+
+ /*
+ * Power off requests are treated as performing standby
+ * as this simplifies Xen implementation.
+ */
+
+ vcpu_block_unless_event_pending(v);
+ return PSCI_SUCCESS;
+}
+
+int32_t do_psci_0_2_cpu_off(void)
+{
+ return do_psci_cpu_off(0);
+}
+
+int32_t do_psci_0_2_cpu_on(register_t target_cpu, register_t entry_point,
+ register_t context_id)
+{
+ return do_common_cpu_on(target_cpu,entry_point,context_id,XEN_PSCI_V_0_2);
+}
+
+static const unsigned long target_affinity_mask[] = {
+ ( MPIDR_HWID_MASK & AFFINITY_MASK( 0 ) ),
+ ( MPIDR_HWID_MASK & AFFINITY_MASK( 1 ) ),
+ ( MPIDR_HWID_MASK & AFFINITY_MASK( 2 ) )
+#ifdef CONFIG_ARM_64
+ ,( MPIDR_HWID_MASK & AFFINITY_MASK( 3 ) )
+#endif
+};
+
+int32_t do_psci_0_2_affinity_info(register_t target_affinity,
+ uint32_t lowest_affinity_level)
+{
+ struct domain *d = current->domain;
+ struct vcpu *v;
+ uint32_t vcpuid;
+ unsigned long tmask;
+
+ if ( lowest_affinity_level < ARRAY_SIZE(target_affinity_mask) )
+ {
+ tmask = target_affinity_mask[lowest_affinity_level];
+ target_affinity &= tmask;
+ }
+ else
+ return PSCI_INVALID_PARAMETERS;
+
+ for ( vcpuid = 0; vcpuid < d->max_vcpus; vcpuid++ )
+ {
+ v = d->vcpu[vcpuid];
+
+ if ( ( ( v->arch.vmpidr & tmask ) == target_affinity )
+ && ( !test_bit(_VPF_down, &v->pause_flags) ) )
+ return PSCI_0_2_AFFINITY_LEVEL_ON;
+ }
+
+ return PSCI_0_2_AFFINITY_LEVEL_OFF;
+}
+
+int32_t do_psci_0_2_migrate(uint32_t target_cpu)
+{
+ return PSCI_NOT_SUPPORTED;
+}
+
+uint32_t do_psci_0_2_migrate_info_type(void)
+{
+ return PSCI_0_2_TOS_MP_OR_NOT_PRESENT;
+}
+
+register_t do_psci_0_2_migrate_info_up_cpu(void)
+{
+ return PSCI_NOT_SUPPORTED;
+}
+
+void do_psci_0_2_system_off( void )
+{
+ struct domain *d = current->domain;
+ domain_shutdown(d,SHUTDOWN_poweroff);
+}
+
+void do_psci_0_2_system_reset(void)
+{
+ struct domain *d = current->domain;
+ domain_shutdown(d,SHUTDOWN_reboot);
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 9267c1b..8a237c4 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -16,6 +16,9 @@
#define MPIDR_AFF0_MASK (_AC(0xff,U) << MPIDR_AFF0_SHIFT)
#define MPIDR_HWID_MASK _AC(0xffffff,U)
#define MPIDR_INVALID (~MPIDR_HWID_MASK)
+#define MPIDR_LEVEL_BITS (8)
+#define AFFINITY_MASK(level) ~((_AC(0x1,U) << ((level) * MPIDR_LEVEL_BITS))
- 1)
+
/* TTBCR Translation Table Base Control Register */
#define TTBCR_EAE _AC(0x80000000,U)
diff --git a/xen/include/asm-arm/psci.h b/xen/include/asm-arm/psci.h
index 189964b..9777c03 100644
--- a/xen/include/asm-arm/psci.h
+++ b/xen/include/asm-arm/psci.h
@@ -1,10 +1,16 @@
#ifndef __ASM_PSCI_H__
#define __ASM_PSCI_H__
-#define PSCI_SUCCESS 0
-#define PSCI_ENOSYS -1
-#define PSCI_EINVAL -2
-#define PSCI_DENIED -3
+/* PSCI return values (inclusive of all PSCI versions) */
+#define PSCI_SUCCESS 0
+#define PSCI_NOT_SUPPORTED -1
+#define PSCI_INVALID_PARAMETERS -2
+#define PSCI_DENIED -3
+#define PSCI_ALREADY_ON -4
+#define PSCI_ON_PENDING -5
+#define PSCI_INTERNAL_FAILURE -6
+#define PSCI_NOT_PRESENT -7
+#define PSCI_DISABLED -8
/* availability of PSCI on the host for SMP bringup */
extern bool_t psci_available;
@@ -13,10 +19,71 @@ int psci_init(void);
int call_psci_cpu_on(int cpu);
/* functions to handle guest PSCI requests */
-int do_psci_cpu_on(uint32_t vcpuid, register_t entry_point);
-int do_psci_cpu_off(uint32_t power_state);
-int do_psci_cpu_suspend(uint32_t power_state, register_t entry_point);
-int do_psci_migrate(uint32_t vcpuid);
+int32_t do_psci_cpu_on(uint32_t vcpuid, register_t entry_point);
+int32_t do_psci_cpu_off(uint32_t power_state);
+int32_t do_psci_cpu_suspend(uint32_t power_state, register_t entry_point);
+int32_t do_psci_migrate(uint32_t vcpuid);
+
+/* PSCI 0.2 functions to handle guest PSCI requests */
+uint32_t do_psci_0_2_version(void);
+register_t do_psci_0_2_cpu_suspend(uint32_t power_state, register_t
entry_point,
+ register_t context_id);
+int32_t do_psci_0_2_cpu_off(void);
+int32_t do_psci_0_2_cpu_on(register_t target_cpu, register_t entry_point,
+ register_t context_id);
+int32_t do_psci_0_2_affinity_info(register_t target_affinity,
+ uint32_t lowest_affinity_level);
+int32_t do_psci_0_2_migrate(uint32_t target_cpu);
+uint32_t do_psci_0_2_migrate_info_type(void);
+register_t do_psci_0_2_migrate_info_up_cpu(void);
+void do_psci_0_2_system_off(void);
+void do_psci_0_2_system_reset(void);
+
+/* PSCI version */
+#define XEN_PSCI_V_0_1 1
+#define XEN_PSCI_V_0_2 2
+
+/* PSCI v0.2 interface */
+#define PSCI_0_2_FN_BASE 0x84000000
+#define PSCI_0_2_FN(n) (PSCI_0_2_FN_BASE + (n))
+#define PSCI_0_2_64BIT 0x40000000
+#define PSCI_0_2_FN64_BASE \
+ (PSCI_0_2_FN_BASE + PSCI_0_2_64BIT)
+#define PSCI_0_2_FN64(n) (PSCI_0_2_FN64_BASE + (n))
+
+#define PSCI_0_2_FN_PSCI_VERSION PSCI_0_2_FN(0)
+#define PSCI_0_2_FN_CPU_SUSPEND PSCI_0_2_FN(1)
+#define PSCI_0_2_FN_CPU_OFF PSCI_0_2_FN(2)
+#define PSCI_0_2_FN_CPU_ON PSCI_0_2_FN(3)
+#define PSCI_0_2_FN_AFFINITY_INFO PSCI_0_2_FN(4)
+#define PSCI_0_2_FN_MIGRATE PSCI_0_2_FN(5)
+#define PSCI_0_2_FN_MIGRATE_INFO_TYPE PSCI_0_2_FN(6)
+#define PSCI_0_2_FN_MIGRATE_INFO_UP_CPU PSCI_0_2_FN(7)
+#define PSCI_0_2_FN_SYSTEM_OFF PSCI_0_2_FN(8)
+#define PSCI_0_2_FN_SYSTEM_RESET PSCI_0_2_FN(9)
+
+#define PSCI_0_2_FN64_CPU_SUSPEND PSCI_0_2_FN64(1)
+#define PSCI_0_2_FN64_CPU_ON PSCI_0_2_FN64(3)
+#define PSCI_0_2_FN64_AFFINITY_INFO PSCI_0_2_FN64(4)
+#define PSCI_0_2_FN64_MIGRATE PSCI_0_2_FN64(5)
+#define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7)
+
+/* PSCI v0.2 affinity level state returned by AFFINITY_INFO */
+#define PSCI_0_2_AFFINITY_LEVEL_ON 0
+#define PSCI_0_2_AFFINITY_LEVEL_OFF 1
+#define PSCI_0_2_AFFINITY_LEVEL_ON_PENDING 2
+
+/* PSCI v0.2 multicore support in Trusted OS returned by MIGRATE_INFO_TYPE */
+#define PSCI_0_2_TOS_UP_MIGRATE_CAPABLE 0
+#define PSCI_0_2_TOS_UP_NOT_MIGRATE_CAPABLE 1
+#define PSCI_0_2_TOS_MP_OR_NOT_PRESENT 2
+
+/* PSCI v0.2 power state encoding for CPU_SUSPEND function */
+#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
+#define PSCI_0_2_POWER_STATE_ID_SHIFT 0
+#define PSCI_0_2_POWER_STATE_TYPE_SHIFT 16
+#define PSCI_0_2_POWER_STATE_TYPE_MASK \
+ (0x1 << PSCI_0_2_POWER_STATE_TYPE_SHIFT)
#endif /* __ASM_PSCI_H__ */
--
1.9.1
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