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Send power management events to the Trusted OS (TLK)
This patch adds PM handlers to TLKD for the system suspend/resume and system poweroff/reset cases. TLK expects all SMCs through a single handler, which then fork out into multiple handlers depending on the SMC. We tap into the same single entrypoint by restoring the S-EL1 context before passing the PM event via register 'x0'. On completion of the PM event, TLK sends a completion SMC and TLKD then moves on with the PM process. Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
This commit is contained in:
Varun Wadekar
parent
a6ef882c0e
commit
cb790c5e48
3 changed files with 135 additions and 2 deletions
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@ -43,6 +43,9 @@
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#define TLK_REGISTER_LOGBUF TLK_TOS_STD_FID(0x1)
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#define TLK_REGISTER_REQBUF TLK_TOS_STD_FID(0x2)
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#define TLK_RESUME_FID TLK_TOS_STD_FID(0x100)
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#define TLK_SYSTEM_SUSPEND TLK_TOS_STD_FID(0xE001)
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#define TLK_SYSTEM_RESUME TLK_TOS_STD_FID(0xE002)
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#define TLK_SYSTEM_OFF TLK_TOS_STD_FID(0xE003)
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/*
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* SMC function IDs that TLK uses to signal various forms of completions
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@ -52,6 +55,9 @@
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#define TLK_PREEMPTED (0x32000002 | (1 << 31))
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#define TLK_ENTRY_DONE (0x32000003 | (1 << 31))
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#define TLK_VA_TRANSLATE (0x32000004 | (1 << 31))
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#define TLK_SUSPEND_DONE (0x32000005 | (1 << 31))
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#define TLK_RESUME_DONE (0x32000006 | (1 << 31))
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#define TLK_SYSTEM_OFF_DONE (0x32000007 | (1 << 31))
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/*
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* Trusted Application specific function IDs
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@ -54,9 +54,9 @@
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extern const spd_pm_ops_t tlkd_pm_ops;
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/*******************************************************************************
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* Array to keep track of per-cpu Secure Payload state
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* Per-cpu Secure Payload state
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******************************************************************************/
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static tlk_context_t tlk_ctx;
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tlk_context_t tlk_ctx;
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/* TLK UID: RFC-4122 compliant UUID (version-5, sha-1) */
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DEFINE_SVC_UUID(tlk_uuid,
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@ -386,6 +386,31 @@ uint64_t tlkd_smc_handler(uint32_t smc_fid,
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*/
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tlkd_synchronous_sp_exit(&tlk_ctx, x1);
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/*
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* These function IDs are used only by TLK to indicate it has
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* finished:
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* 1. suspending itself after an earlier psci cpu_suspend
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* request.
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* 2. resuming itself after an earlier psci cpu_suspend
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* request.
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* 3. powering down after an earlier psci system_off/system_reset
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* request.
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*/
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case TLK_SUSPEND_DONE:
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case TLK_RESUME_DONE:
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case TLK_SYSTEM_OFF_DONE:
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if (ns)
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SMC_RET1(handle, SMC_UNK);
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/*
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* TLK reports completion. TLKD must have initiated the
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* original request through a synchronous entry into the SP.
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* Jump back to the original C runtime context, and pass x1 as
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* return value to the caller
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*/
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tlkd_synchronous_sp_exit(&tlk_ctx, x1);
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/*
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* Return the number of service function IDs implemented to
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* provide service to non-secure
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@ -28,7 +28,17 @@
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <arch_helpers.h>
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#include <assert.h>
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#include <bl_common.h>
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#include <context_mgmt.h>
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#include <debug.h>
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#include <psci.h>
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#include <tlk.h>
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#include "tlkd_private.h"
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extern tlk_context_t tlk_ctx;
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#define MPIDR_CPU0 0x80000000
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@ -45,10 +55,102 @@ static int32_t cpu_migrate_info(uint64_t *resident_cpu)
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return PSCI_TOS_NOT_UP_MIG_CAP;
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}
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/*******************************************************************************
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* This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so
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* that it can pass this information to its Trusted Apps.
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******************************************************************************/
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static void cpu_suspend_handler(uint64_t suspend_level)
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{
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gp_regs_t *gp_regs;
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int cpu = read_mpidr() & MPIDR_CPU_MASK;
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int32_t rc = 0;
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/*
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* TLK runs only on CPU0 and suspends its Trusted Apps during
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* SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND.
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*/
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if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
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return;
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/* pass system suspend event to TLK */
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gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
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write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND);
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/* Program the entry point and enter TLK */
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rc = tlkd_synchronous_sp_entry(&tlk_ctx);
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/*
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* Read the response from TLK. A non-zero return means that
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* something went wrong while communicating with it.
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*/
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if (rc != 0)
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panic();
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}
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/*******************************************************************************
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* This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so
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* that it can pass this information to its Trusted Apps.
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******************************************************************************/
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static void cpu_resume_handler(uint64_t suspend_level)
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{
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gp_regs_t *gp_regs;
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int cpu = read_mpidr() & MPIDR_CPU_MASK;
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int32_t rc = 0;
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/*
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* TLK runs only on CPU0 and resumes its Trusted Apps during
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* SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND
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* exit.
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*/
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if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
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return;
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/* pass system resume event to TLK */
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gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
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write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME);
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/* Program the entry point and enter TLK */
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rc = tlkd_synchronous_sp_entry(&tlk_ctx);
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/*
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* Read the response from TLK. A non-zero return means that
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* something went wrong while communicating with it.
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*/
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if (rc != 0)
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panic();
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}
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/*******************************************************************************
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* System is about to be reset. Inform the SP to allow any book-keeping
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******************************************************************************/
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static void system_off_handler(void)
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{
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int cpu = read_mpidr() & MPIDR_CPU_MASK;
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gp_regs_t *gp_regs;
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/* TLK runs only on CPU0 */
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if (cpu != 0)
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return;
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/* pass system off/reset events to TLK */
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gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
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write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_OFF);
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/*
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* Enter the SP. We do not care about the return value because we
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* must continue with the shutdown anyway.
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*/
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(void)tlkd_synchronous_sp_entry(&tlk_ctx);
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}
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/*******************************************************************************
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* Structure populated by the Dispatcher to be given a chance to perform any
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* bookkeeping before PSCI executes a power mgmt. operation.
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******************************************************************************/
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const spd_pm_ops_t tlkd_pm_ops = {
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.svc_migrate_info = cpu_migrate_info,
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.svc_suspend = cpu_suspend_handler,
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.svc_suspend_finish = cpu_resume_handler,
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.svc_system_off = system_off_handler,
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.svc_system_reset = system_off_handler
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};
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