x86/tboot: Provide debugfs interfaces to access TXT log

These logs come from tboot (Trusted Boot, an open source,
pre-kernel/VMM module that uses Intel TXT to perform a
measured and verified launch of an OS kernel/VMM.).

Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Gang Wei <gang.wei@intel.com>
Link: http://lkml.kernel.org/r/1372053333-21788-1-git-send-email-qiaowei.ren@intel.com
[ Beautified the code a bit. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index f84fe00..3ff42d2 100644 (file)
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -31,6 +31,7 @@
 #include <linux/pfn.h>
 #include <linux/mm.h>
 #include <linux/tboot.h>
+#include <linux/debugfs.h>
 
 #include <asm/realmode.h>
 #include <asm/processor.h>
@@ -338,6 +339,73 @@ static struct notifier_block tboot_cpu_notifier __cpuinitdata =
        .notifier_call = tboot_cpu_callback,
 };
 
+#ifdef CONFIG_DEBUG_FS
+
+#define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \
+                         0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 }
+
+#define TBOOT_SERIAL_LOG_ADDR  0x60000
+#define TBOOT_SERIAL_LOG_SIZE  0x08000
+#define LOG_MAX_SIZE_OFF       16
+#define LOG_BUF_OFF            24
+
+static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID;
+
+static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos)
+{
+       void __iomem *log_base;
+       u8 log_uuid[16];
+       u32 max_size;
+       void *kbuf;
+       int ret = -EFAULT;
+
+       log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
+       if (!log_base)
+               return ret;
+
+       memcpy_fromio(log_uuid, log_base, sizeof(log_uuid));
+       if (memcmp(&tboot_log_uuid, log_uuid, sizeof(log_uuid)))
+               goto err_iounmap;
+
+       max_size = readl(log_base + LOG_MAX_SIZE_OFF);
+       if (*ppos >= max_size) {
+               ret = 0;
+               goto err_iounmap;
+       }
+
+       if (*ppos + count > max_size)
+               count = max_size - *ppos;
+
+       kbuf = kmalloc(count, GFP_KERNEL);
+       if (!kbuf) {
+               ret = -ENOMEM;
+               goto err_iounmap;
+       }
+
+       memcpy_fromio(kbuf, log_base + LOG_BUF_OFF + *ppos, count);
+       if (copy_to_user(user_buf, kbuf, count))
+               goto err_kfree;
+
+       *ppos += count;
+
+       ret = count;
+
+err_kfree:
+       kfree(kbuf);
+
+err_iounmap:
+       iounmap(log_base);
+
+       return ret;
+}
+
+static const struct file_operations tboot_log_fops = {
+       .read   = tboot_log_read,
+       .llseek = default_llseek,
+};
+
+#endif /* CONFIG_DEBUG_FS */
+
 static __init int tboot_late_init(void)
 {
        if (!tboot_enabled())
@@ -348,6 +416,11 @@ static __init int tboot_late_init(void)
        atomic_set(&ap_wfs_count, 0);
        register_hotcpu_notifier(&tboot_cpu_notifier);
 
+#ifdef CONFIG_DEBUG_FS
+       debugfs_create_file("tboot_log", S_IRUSR,
+                       arch_debugfs_dir, NULL, &tboot_log_fops);
+#endif
+
        acpi_os_set_prepare_sleep(&tboot_sleep);
        return 0;
 }