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>

12 files changed, 70 insertions, 74 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 738bdc6b0f8b..b66f2102c35d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -178,6 +178,10 @@ config ARCH_SUPPORTS_OPTIMIZED_INLINING
 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
         def_bool y
 
+config HAVE_INTEL_TXT
+        def_bool y
+        depends on EXPERIMENTAL && DMAR && ACPI
+
 # Use the generic interrupt handling code in kernel/irq/:
 config GENERIC_HARDIRQS
         bool
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)
  */
diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index 8c01dd3724e0..cc22f9a585b0 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -45,7 +45,7 @@
 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "actables.h"
-#include <asm/tboot.h>
+#include <linux/tboot.h>
 
 #define _COMPONENT          ACPI_HARDWARE
 ACPI_MODULE_NAME("hwsleep")
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 0cbc5fd26c3c..ab99783dccec 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -33,7 +33,7 @@
 #include <linux/timer.h>
 #include <linux/irq.h>
 #include <linux/interrupt.h>
-#include <asm/tboot.h>
+#include <linux/tboot.h>
 
 #undef PREFIX
 #define PREFIX "DMAR:"
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 2dc72a6d7412..833509b53527 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -37,8 +37,8 @@
 #include <linux/iommu.h>
 #include <linux/intel-iommu.h>
 #include <linux/sysdev.h>
+#include <linux/tboot.h>
 #include <asm/cacheflush.h>
-#include <asm/tboot.h>
 #include <asm/iommu.h>
 #include "pci.h"
 
diff --git a/arch/x86/include/asm/tboot.h b/include/linux/tboot.h
index b13929d4e5f4..bf2a0c748878 100644
--- a/arch/x86/include/asm/tboot.h
+++ b/include/linux/tboot.h
@@ -20,10 +20,8 @@
  *
  */
 
-#ifndef _ASM_TBOOT_H
-#define _ASM_TBOOT_H
-
-#include <acpi/acpi.h>
+#ifndef _LINUX_TBOOT_H
+#define _LINUX_TBOOT_H
 
 /* these must have the values from 0-5 in this order */
 enum {
@@ -36,7 +34,7 @@ enum {
 };
 
 #ifdef CONFIG_INTEL_TXT
-
+#include <acpi/acpi.h>
 /* used to communicate between tboot and the launched kernel */
 
 #define TB_KEY_SIZE             64   /* 512 bits */
@@ -144,54 +142,21 @@ static inline int tboot_enabled(void)
 }
 
 extern void tboot_probe(void);
-extern void tboot_create_trampoline(void);
 extern void tboot_shutdown(u32 shutdown_type);
 extern void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control);
-extern int tboot_wait_for_aps(int num_aps);
 extern struct acpi_table_header *tboot_get_dmar_table(
                                       struct acpi_table_header *dmar_tbl);
 extern int tboot_force_iommu(void);
 
-#else     /* CONFIG_INTEL_TXT */
-
-static inline int tboot_enabled(void)
-{
-        return 0;
-}
-
-static inline void tboot_probe(void)
-{
-}
-
-static inline void tboot_create_trampoline(void)
-{
-}
-
-static inline void tboot_shutdown(u32 shutdown_type)
-{
-}
-
-static inline void tboot_sleep(u8 sleep_state, u32 pm1a_control,
-                               u32 pm1b_control)
-{
-}
-
-static inline int tboot_wait_for_aps(int num_aps)
-{
-        return 0;
-}
+#else
 
-static inline struct acpi_table_header *tboot_get_dmar_table(
-                                        struct acpi_table_header *dmar_tbl)
-{
-        return dmar_tbl;
-}
-
-static inline int tboot_force_iommu(void)
-{
-        return 0;
-}
+#define tboot_probe()                   do { } while (0)
+#define tboot_shutdown(shutdown_type)   do { } while (0)
+#define tboot_sleep(sleep_state, pm1a_control, pm1b_control)    \
+                                        do { } while (0)
+#define tboot_get_dmar_table(dmar_tbl)  (dmar_tbl)
+#define tboot_force_iommu()             0
 
 #endif /* !CONFIG_INTEL_TXT */
 
-#endif /* _ASM_TBOOT_H */
+#endif /* _LINUX_TBOOT_H */
diff --git a/init/main.c b/init/main.c
index 56ada27c4f47..2c5ade79eb81 100644
--- a/init/main.c
+++ b/init/main.c
@@ -73,7 +73,6 @@
 #include <asm/io.h>
 #include <asm/bugs.h>
 #include <asm/setup.h>
-#include <asm/tboot.h>
 #include <asm/sections.h>
 #include <asm/cacheflush.h>
 
@@ -716,8 +715,6 @@ asmlinkage void __init start_kernel(void)
 
         ftrace_init();
 
-        tboot_create_trampoline();
-
         /* Do the rest non-__init'ed, we're now alive */
         rest_init();
 }
diff --git a/kernel/cpu.c b/kernel/cpu.c
index ff071e022a85..67a60076dd7e 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -14,7 +14,6 @@
 #include <linux/kthread.h>
 #include <linux/stop_machine.h>
 #include <linux/mutex.h>
-#include <asm/tboot.h>
 
 #ifdef CONFIG_SMP
 /* Serializes the updates to cpu_online_mask, cpu_present_mask */
@@ -377,7 +376,7 @@ static cpumask_var_t frozen_cpus;
 
 int disable_nonboot_cpus(void)
 {
-        int cpu, first_cpu, error, num_cpus = 0;
+        int cpu, first_cpu, error;
 
         error = stop_machine_create();
         if (error)
@@ -392,7 +391,6 @@ int disable_nonboot_cpus(void)
         for_each_online_cpu(cpu) {
                 if (cpu == first_cpu)
                         continue;
-                num_cpus++;
                 error = _cpu_down(cpu, 1);
                 if (!error) {
                         cpumask_set_cpu(cpu, frozen_cpus);
@@ -403,8 +401,6 @@ int disable_nonboot_cpus(void)
                         break;
                 }
         }
-        /* ensure all CPUs have gone into wait-for-SIPI */
-        error |= tboot_wait_for_aps(num_cpus);
 
         if (!error) {
                 BUG_ON(num_online_cpus() > 1);
diff --git a/security/Kconfig b/security/Kconfig
index 6631774672c1..5721847a7a62 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -115,7 +115,7 @@ config SECURITY_ROOTPLUG
 
 config INTEL_TXT
         bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
-        depends on EXPERIMENTAL && X86 && DMAR && ACPI
+        depends on HAVE_INTEL_TXT
         help
           This option enables support for booting the kernel with the
           Trusted Boot (tboot) module. This will utilize