x86, intel_txt: clean up the impact on generic code, unbreak non-x86

Move tboot.h from asm to linux to fix the build errors of intel_txt
patch on non-X86 platforms. Remove the tboot code from generic code
init/main.c and kernel/cpu.c.

Signed-off-by: Shane Wang <shane.wang@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

4 files changed, 50 insertions, 16 deletions

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 9de01c5d9794..18ce5c04242a 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -3,6 +3,7 @@
 #include <linux/init.h>
 #include <linux/pm.h>
 #include <linux/efi.h>
+#include <linux/tboot.h>
 #include <acpi/reboot.h>
 #include <asm/io.h>
 #include <asm/apic.h>
@@ -24,8 +25,6 @@
 # include <asm/iommu.h>
 #endif
 
-#include <asm/tboot.h>
-
 /*
  * Power off function, if any
  */
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 80d6e9e32483..6ce0d6f38f7f 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -66,6 +66,7 @@
 
 #include <linux/percpu.h>
 #include <linux/crash_dump.h>
+#include <linux/tboot.h>
 
 #include <video/edid.h>
 
@@ -145,8 +146,6 @@ struct boot_params __initdata boot_params;
 struct boot_params boot_params;
 #endif
 
-#include <asm/tboot.h>
-
 /*
  * Machine setup..
  */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 61cc40887c48..7d9d8eea20a0 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -47,6 +47,7 @@
 #include <linux/bootmem.h>
 #include <linux/err.h>
 #include <linux/nmi.h>
+#include <linux/tboot.h>
 
 #include <asm/acpi.h>
 #include <asm/desc.h>
@@ -62,7 +63,6 @@
 #include <asm/vmi.h>
 #include <asm/apic.h>
 #include <asm/setup.h>
-#include <asm/tboot.h>
 #include <asm/uv/uv.h>
 #include <linux/mc146818rtc.h>
 
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index c2e760ca7b01..86c9f91b48ae 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)
  */