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SPMD: lock the g_spmd_pm structure 

Add a lock and spin lock/unlock calls when accessing the fields of the
SPMD PM structure.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I9bab705564dc1ba003c29512b1f9be5f126fbb0d
This commit is contained in:
Olivier Deprez 2021-03-02 17:31:22 +01:00
parent cdb49d475e
commit 473ced5670
1 changed files with 18 additions and 3 deletions
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21
services/std_svc/spmd/spmd_pm.c
View File

@ -7,11 +7,13 @@
#include <assert.h>
#include <errno.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <lib/spinlock.h>
#include "spmd_private.h"
static struct {
bool secondary_ep_locked;
uintptr_t secondary_ep;
spinlock_t lock;
} g_spmd_pm;
/*******************************************************************************
@ -34,8 +36,12 @@ static void spmd_build_spmc_message(gp_regs_t *gpregs, unsigned long long messag
******************************************************************************/
int spmd_pm_secondary_ep_register(uintptr_t entry_point)
{
int ret = FFA_ERROR_INVALID_PARAMETER;
spin_lock(&g_spmd_pm.lock);
if (g_spmd_pm.secondary_ep_locked == true) {
return FFA_ERROR_INVALID_PARAMETER;
goto out;
}
/*
@ -45,7 +51,7 @@ int spmd_pm_secondary_ep_register(uintptr_t entry_point)
if (!spmd_check_address_in_binary_image(entry_point)) {
ERROR("%s entry point is not within image boundaries\n",
__func__);
return FFA_ERROR_INVALID_PARAMETER;
goto out;
}
g_spmd_pm.secondary_ep = entry_point;
@ -53,7 +59,12 @@ int spmd_pm_secondary_ep_register(uintptr_t entry_point)
VERBOSE("%s %lx\n", __func__, entry_point);
return 0;
ret = 0;
out:
spin_unlock(&g_spmd_pm.lock);
return ret;
}
/*******************************************************************************
@ -73,6 +84,8 @@ static void spmd_cpu_on_finish_handler(u_register_t unused)
assert(ctx->state != SPMC_STATE_ON);
assert(spmc_ep_info != NULL);
spin_lock(&g_spmd_pm.lock);
/*
* Leave the possibility that the SPMC does not call
* FFA_SECONDARY_EP_REGISTER in which case re-use the
@ -82,6 +95,8 @@ static void spmd_cpu_on_finish_handler(u_register_t unused)
spmc_ep_info->pc = g_spmd_pm.secondary_ep;
}
spin_unlock(&g_spmd_pm.lock);
cm_setup_context(&ctx->cpu_ctx, spmc_ep_info);
/* Mark CPU as initiating ON operation */