* [PATCH v2] x86, tboot: provide debugfs interfaces to access TXT log
@ 2013-06-24 5:55 Qiaowei Ren
2013-06-28 16:09 ` [tip:x86/debug] x86/tboot: Provide " tip-bot for Qiaowei Ren
0 siblings, 1 reply; 2+ messages in thread
From: Qiaowei Ren @ 2013-06-24 5:55 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, H. Peter Anvin, x86
Cc: linux-kernel, Gang Wei, Qiaowei Ren
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>
---
arch/x86/kernel/tboot.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index f84fe00..2dec186 100644
--- 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 +339,72 @@ static struct notifier_block tboot_cpu_notifier __cpuinitdata =
.notifier_call = tboot_cpu_callback,
};
+#if defined(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 +415,11 @@ static __init int tboot_late_init(void)
atomic_set(&ap_wfs_count, 0);
register_hotcpu_notifier(&tboot_cpu_notifier);
+#if defined(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;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [tip:x86/debug] x86/tboot: Provide debugfs interfaces to access TXT log
2013-06-24 5:55 [PATCH v2] x86, tboot: provide debugfs interfaces to access TXT log Qiaowei Ren
@ 2013-06-28 16:09 ` tip-bot for Qiaowei Ren
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Qiaowei Ren @ 2013-06-28 16:09 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, qiaowei.ren, hpa, mingo, gang.wei, tglx
Commit-ID: 13bfd47a0ef68fc8b21e67873dbdf269c7db6b59
Gitweb: http://git.kernel.org/tip/13bfd47a0ef68fc8b21e67873dbdf269c7db6b59
Author: Qiaowei Ren <qiaowei.ren@intel.com>
AuthorDate: Mon, 24 Jun 2013 13:55:33 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 28 Jun 2013 11:05:16 +0200
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>
---
arch/x86/kernel/tboot.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 73 insertions(+)
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index f84fe00..3ff42d2 100644
--- 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;
}
^ permalink raw reply related [flat|nested] 2+ messages in thread
end of thread, other threads:[~2013-06-28 16:12 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
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2013-06-24 5:55 [PATCH v2] x86, tboot: provide debugfs interfaces to access TXT log Qiaowei Ren
2013-06-28 16:09 ` [tip:x86/debug] x86/tboot: Provide " tip-bot for Qiaowei Ren
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