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reset2: Add PSCI system_reset2 function

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This patch implements PSCI_SYSTEM_RESET2 API as defined in PSCI
v1.1 specification. The specification allows architectural and
vendor-specific resets via this API. In the current specification,
there is only one architectural reset, the warm reset. This reset is
intended to provide a fast reboot path that guarantees not to reset
system main memory.

Change-Id: I057bb81a60cd0fe56465dbb5791d8e1cca025bd3
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
This commit is contained in:
Roberto Vargas 2017-07-26 09:23:09 +01:00
parent 4d415c11c4
commit 36a8f8fd47
5 changed files with 54 additions and 1 deletions
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12
include/lib/psci/psci.h
View file

@ -65,6 +65,8 @@
#define PSCI_STAT_RESIDENCY_AARCH64 U(0xc4000010)
#define PSCI_STAT_COUNT_AARCH32 U(0x84000011)
#define PSCI_STAT_COUNT_AARCH64 U(0xc4000011)
#define PSCI_SYSTEM_RESET2_AARCH32 U(0x84000012)
#define PSCI_SYSTEM_RESET2_AARCH64 U(0xc4000012)
#define PSCI_MEM_PROTECT U(0x84000013)
#define PSCI_MEM_CHK_RANGE_AARCH32 U(0x84000014)
#define PSCI_MEM_CHK_RANGE_AARCH64 U(0xc4000014)
@ -167,6 +169,14 @@
#define PSCI_INVALID_MPIDR ~((u_register_t)0)
/*
* SYSTEM_RESET2 macros
*/
#define PSCI_RESET2_TYPE_VENDOR_SHIFT 31
#define PSCI_RESET2_TYPE_VENDOR (1U << PSCI_RESET2_TYPE_VENDOR_SHIFT)
#define PSCI_RESET2_TYPE_ARCH (0U << PSCI_RESET2_TYPE_VENDOR_SHIFT)
#define PSCI_RESET2_SYSTEM_WARM_RESET (PSCI_RESET2_TYPE_ARCH | 0)
#ifndef __ASSEMBLY__
#include <stdint.h>
@ -294,6 +304,8 @@ typedef struct plat_psci_ops {
int (*mem_protect_chk)(uintptr_t base, u_register_t length);
int (*read_mem_protect)(int *val);
int (*write_mem_protect)(int val);
int (*system_reset2)(int is_vendor,
int reset_type, u_register_t cookie);
} plat_psci_ops_t;
/*******************************************************************************

7
lib/psci/psci_main.c
View file

@ -414,6 +414,10 @@ u_register_t psci_smc_handler(uint32_t smc_fid,
case PSCI_MEM_CHK_RANGE_AARCH32:
return psci_mem_chk_range(x1, x2);
case PSCI_SYSTEM_RESET2_AARCH32:
/* We should never return from psci_system_reset2() */
return psci_system_reset2(x1, x2);
default:
break;
}
@ -453,6 +457,9 @@ u_register_t psci_smc_handler(uint32_t smc_fid,
case PSCI_MEM_CHK_RANGE_AARCH64:
return psci_mem_chk_range(x1, x2);
case PSCI_SYSTEM_RESET2_AARCH64:
/* We should never return from psci_system_reset2() */
return psci_system_reset2(x1, x2);
default:
break;

4
lib/psci/psci_private.h
View file

@ -89,7 +89,8 @@
define_psci_cap(PSCI_NODE_HW_STATE_AARCH64) | \
define_psci_cap(PSCI_SYSTEM_SUSPEND_AARCH64) | \
define_psci_cap(PSCI_STAT_RESIDENCY_AARCH64) | \
define_psci_cap(PSCI_STAT_COUNT_AARCH64))
define_psci_cap(PSCI_STAT_COUNT_AARCH64) | \
define_psci_cap(PSCI_SYSTEM_RESET2_AARCH64))
/*
* Helper macros to get/set the fields of PSCI per-cpu data.
@ -258,6 +259,7 @@ void psci_do_pwrup_cache_maintenance(void);
/* Private exported functions from psci_system_off.c */
void __dead2 psci_system_off(void);
void __dead2 psci_system_reset(void);
int psci_system_reset2(uint32_t reset_type, u_register_t cookie);
/* Private exported functions from psci_stat.c */
void psci_stats_update_pwr_down(unsigned int end_pwrlvl,

2
lib/psci/psci_setup.c
View file

@ -248,6 +248,8 @@ int psci_setup(const psci_lib_args_t *lib_args)
psci_caps |= define_psci_cap(PSCI_MEM_PROTECT);
if (psci_plat_pm_ops->mem_protect_chk)
psci_caps |= define_psci_cap(PSCI_MEM_CHK_RANGE_AARCH64);
if (psci_plat_pm_ops->system_reset2)
psci_caps |= define_psci_cap(PSCI_SYSTEM_RESET2_AARCH64);
#if ENABLE_PSCI_STAT
psci_caps |= define_psci_cap(PSCI_STAT_RESIDENCY_AARCH64);

30
lib/psci/psci_system_off.c
View file

@ -49,3 +49,33 @@ void __dead2 psci_system_reset(void)
/* This function does not return. We should never get here */
}
int psci_system_reset2(uint32_t reset_type, u_register_t cookie)
{
int is_vendor;
psci_print_power_domain_map();
assert(psci_plat_pm_ops->system_reset2);
is_vendor = (reset_type >> PSCI_RESET2_TYPE_VENDOR_SHIFT) & 1;
if (!is_vendor) {
/*
* Only WARM_RESET is allowed for architectural type resets.
*/
if (reset_type != PSCI_RESET2_SYSTEM_WARM_RESET)
return PSCI_E_INVALID_PARAMS;
if (psci_plat_pm_ops->write_mem_protect &&
psci_plat_pm_ops->write_mem_protect(0) < 0) {
return PSCI_E_NOT_SUPPORTED;
}
}
/* Notify the Secure Payload Dispatcher */
if (psci_spd_pm && psci_spd_pm->svc_system_reset) {
psci_spd_pm->svc_system_reset();
}
console_flush();
return psci_plat_pm_ops->system_reset2(is_vendor, reset_type, cookie);
}