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Diffstat (limited to 'arch/x86/kernel/tboot.c')
-rw-r--r--arch/x86/kernel/tboot.c58
1 files changed, 47 insertions, 11 deletions
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index c2e760ca7b0..86c9f91b48a 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -22,11 +22,14 @@
#include <linux/dma_remapping.h>
#include <linux/init_task.h>
#include <linux/spinlock.h>
+#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/dmar.h>
+#include <linux/cpu.h>
#include <linux/pfn.h>
#include <linux/mm.h>
+#include <linux/tboot.h>
#include <asm/trampoline.h>
#include <asm/processor.h>
@@ -36,7 +39,6 @@
#include <asm/fixmap.h>
#include <asm/proto.h>
#include <asm/setup.h>
-#include <asm/tboot.h>
#include <asm/e820.h>
#include <asm/io.h>
@@ -154,13 +156,10 @@ static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
return 0;
}
-void tboot_create_trampoline(void)
+static void tboot_create_trampoline(void)
{
u32 map_base, map_size;
- if (!tboot_enabled())
- return;
-
/* Create identity map for tboot shutdown code. */
map_base = PFN_DOWN(tboot->tboot_base);
map_size = PFN_UP(tboot->tboot_size);
@@ -295,21 +294,58 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
tboot_shutdown(acpi_shutdown_map[sleep_state]);
}
-int tboot_wait_for_aps(int num_aps)
+static atomic_t ap_wfs_count;
+
+static int tboot_wait_for_aps(int num_aps)
{
unsigned long timeout;
+ timeout = AP_WAIT_TIMEOUT*HZ;
+ while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
+ timeout) {
+ mdelay(1);
+ timeout--;
+ }
+
+ if (timeout)
+ pr_warning("tboot wait for APs timeout\n");
+
+ return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
+}
+
+static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case CPU_DYING:
+ atomic_inc(&ap_wfs_count);
+ if (num_online_cpus() == 1)
+ if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
+ return NOTIFY_BAD;
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block tboot_cpu_notifier __cpuinitdata =
+{
+ .notifier_call = tboot_cpu_callback,
+};
+
+static __init int tboot_late_init(void)
+{
if (!tboot_enabled())
return 0;
- timeout = jiffies + AP_WAIT_TIMEOUT*HZ;
- while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
- time_before(jiffies, timeout))
- cpu_relax();
+ tboot_create_trampoline();
- return time_before(jiffies, timeout) ? 0 : 1;
+ atomic_set(&ap_wfs_count, 0);
+ register_hotcpu_notifier(&tboot_cpu_notifier);
+ return 0;
}
+late_initcall(tboot_late_init);
+
/*
* TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
*/