Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753763Ab3D0HGc (ORCPT ); Sat, 27 Apr 2013 03:06:32 -0400 Received: from mga02.intel.com ([134.134.136.20]:4157 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752410Ab3D0HFo (ORCPT ); Sat, 27 Apr 2013 03:05:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,562,1363158000"; d="scan'208";a="303853872" From: Qiaowei Ren To: Arnd Bergmann , Greg Kroah-Hartman Cc: Richard L Maliszewski , Shane Wang , Gang Wei , linux-kernel@vger.kernel.org, Qiaowei Ren , Xiaoyan Zhang Subject: [PATCH 3/5] driver: provide sysfs interfaces to access TXT log Date: Sat, 27 Apr 2013 22:56:18 +0800 Message-Id: <1367074580-16530-4-git-send-email-qiaowei.ren@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1367074580-16530-1-git-send-email-qiaowei.ren@intel.com> References: <1367074580-16530-1-git-send-email-qiaowei.ren@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5648 Lines: 234 These interfaces are located in /sys/devices/platform/txt/log/. Signed-off-by: Qiaowei Ren Signed-off-by: Xiaoyan Zhang Signed-off-by: Gang Wei --- drivers/char/txt/Makefile | 2 +- drivers/char/txt/txt-log.c | 140 ++++++++++++++++++++++++++++++++++++++++++ drivers/char/txt/txt-log.h | 27 ++++++++ drivers/char/txt/txt-sysfs.c | 5 ++ 4 files changed, 173 insertions(+), 1 deletion(-) create mode 100644 drivers/char/txt/txt-log.c create mode 100644 drivers/char/txt/txt-log.h diff --git a/drivers/char/txt/Makefile b/drivers/char/txt/Makefile index 3db5a6f..fcb0e81 100644 --- a/drivers/char/txt/Makefile +++ b/drivers/char/txt/Makefile @@ -2,4 +2,4 @@ # Makefile for the intel TXT drivers. # obj-$(CONFIG_TXT) += txt.o -txt-y := txt-sysfs.o txt-config.o +txt-y := txt-sysfs.o txt-config.o txt-log.o diff --git a/drivers/char/txt/txt-log.c b/drivers/char/txt/txt-log.c new file mode 100644 index 0000000..10f3918 --- /dev/null +++ b/drivers/char/txt/txt-log.c @@ -0,0 +1,140 @@ +/* + * txt-log.c + * + * - log/ + * log_header -r--r--r-- ; output log header, including max_size and + * curr_pos. + * block -r--r--r-- ; output pure log in block style, 1 page size. + * block_index -rw-rw-r-- ; the block index for output. + */ + +#include +#include +#include +#include +#include + +#include "txt-log.h" + +static u32 log_block_index; + +static int are_uuids_equal(const struct uuid *uuid1, + const struct uuid *uuid2) +{ + return (memcmp(uuid1, uuid2, sizeof(*uuid1)) == 0) ? 1 : 0; +} + +static struct tboot_log *get_log(void) +{ + struct tboot_log *log; + + log = (struct tboot_log *)ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, + TBOOT_SERIAL_LOG_SIZE); + if (!log) + return NULL; + + if (!are_uuids_equal(&(log->uuid), + &((struct uuid)TBOOT_LOG_UUID))) { + iounmap(log); + return NULL; + } + + return log; +} + +ssize_t txt_show_log_header(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct tboot_log *log; + int ret; + + log = get_log(); + if (!log) + return -EFAULT; + + ret = scnprintf(buf, PAGE_SIZE, "max_size: %x\ncurr_pos: %x\n", + log->max_size, log->curr_pos); + + iounmap(log); + return ret; +} +static DEVICE_ATTR(log_header, S_IRUGO, txt_show_log_header, NULL); + +ssize_t txt_show_block(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct tboot_log *log; + char *block; + int ret; + + log = get_log(); + if (!log) + return -EFAULT; + + block = log->buf + log_block_index * PAGE_SIZE; + ret = scnprintf(buf, PAGE_SIZE, "%s\n", block); + + iounmap(log); + return ret; +} +static DEVICE_ATTR(block, S_IRUGO, txt_show_block, NULL); + +ssize_t txt_show_block_index(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", log_block_index); +} + +ssize_t txt_store_block_index(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + u32 index; + struct tboot_log *log; + + log = get_log(); + if (!log) + return -EFAULT; + + sscanf(buf, "%d", &index); + if (index > log->curr_pos / PAGE_SIZE) + return -EINVAL; + log_block_index = index; + + iounmap(log); + return count; +} +static DEVICE_ATTR(block_index, S_IRUGO | S_IWUSR | S_IWGRP, + txt_show_block_index, txt_store_block_index); + +static struct attribute *log_attrs[] = { + &dev_attr_log_header.attr, + &dev_attr_block.attr, + &dev_attr_block_index.attr, + NULL, +}; + +static struct attribute_group log_attr_grp = { + .attrs = log_attrs +}; + +ssize_t sysfs_create_log(struct kobject *parent) +{ + struct kobject *log_kobj; + int retval; + + log_kobj = kobject_create_and_add("log", parent); + if (!log_kobj) + return -ENOMEM; + + retval = sysfs_create_group(log_kobj, &log_attr_grp); + if (retval) + kobject_put(log_kobj); + return retval; +} +EXPORT_SYMBOL_GPL(sysfs_create_log); + +MODULE_LICENSE("GPL"); + diff --git a/drivers/char/txt/txt-log.h b/drivers/char/txt/txt-log.h new file mode 100644 index 0000000..580d71c --- /dev/null +++ b/drivers/char/txt/txt-log.h @@ -0,0 +1,27 @@ +#ifndef __LOG_H__ +#define __LOG_H__ + +struct uuid { + uint32_t data1; + uint16_t data2; + uint16_t data3; + uint16_t data4; + uint8_t data5[6]; +} __packed; + +struct tboot_log { + struct uuid uuid; + uint32_t max_size; + uint32_t curr_pos; + char buf[]; +}; + +#define TBOOT_LOG_UUID {0xc0192526, 0x6b30, 0x4db4, 0x844c, \ + {0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74} } +#define TBOOT_SERIAL_LOG_ADDR 0x60000 +#define TBOOT_SERIAL_LOG_SIZE 0x08000 + +extern ssize_t sysfs_create_log(struct kobject *parent); + +#endif /* __LOG_H__ */ + diff --git a/drivers/char/txt/txt-sysfs.c b/drivers/char/txt/txt-sysfs.c index 99d42d0..e945586 100644 --- a/drivers/char/txt/txt-sysfs.c +++ b/drivers/char/txt/txt-sysfs.c @@ -17,6 +17,7 @@ #include #include "txt-config.h" +#include "txt-log.h" #define DEV_NAME "txt" struct platform_device *pdev; @@ -33,6 +34,10 @@ static int __init txt_sysfs_init(void) if (retval) goto err; + retval = sysfs_create_log(&pdev->dev.kobj); + if (retval) + goto err; + pr_info("Loading TXT module successfully\n"); return 0; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/