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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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5bd91f18be
The clean up procedure now uses platform device "release" callback to handle memory clean up. For this purpose "release" function callback was added to struct tpm_vendor_specific, so hw device driver provider can get called when it is safe to remove all allocated resources. This is supposed to fix a bug in device removal, where device while in receive function (waiting on timeout) was prone to segfault, if the tpm_chip struct was unallocated before the timeout expired (in tpm_remove_hardware). Acked-by: Marcel Selhorst <tpm@selhorst.net> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
154 lines
4.3 KiB
C
154 lines
4.3 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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enum tpm_timeout {
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TPM_TIMEOUT = 5, /* msecs */
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};
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/* TPM addresses */
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enum tpm_addr {
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TPM_SUPERIO_ADDR = 0x2E,
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TPM_ADDR = 0x4E,
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};
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extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
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const char *, size_t);
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extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_temp_deactivated(struct device *,
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struct device_attribute *attr, char *);
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struct tpm_chip;
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struct tpm_vendor_specific {
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const u8 req_complete_mask;
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const u8 req_complete_val;
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const u8 req_canceled;
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void __iomem *iobase; /* ioremapped address */
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unsigned long base; /* TPM base address */
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int irq;
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int region_size;
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int have_region;
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int (*recv) (struct tpm_chip *, u8 *, size_t);
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int (*send) (struct tpm_chip *, u8 *, size_t);
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void (*cancel) (struct tpm_chip *);
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u8 (*status) (struct tpm_chip *);
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void (*release) (struct device *);
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struct miscdevice miscdev;
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struct attribute_group *attr_group;
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struct list_head list;
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int locality;
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unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
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unsigned long duration[3]; /* jiffies */
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wait_queue_head_t read_queue;
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wait_queue_head_t int_queue;
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};
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struct tpm_chip {
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struct device *dev; /* Device stuff */
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int dev_num; /* /dev/tpm# */
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int num_opens; /* only one allowed */
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int time_expired;
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/* Data passed to and from the tpm via the read/write calls */
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u8 *data_buffer;
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atomic_t data_pending;
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struct mutex buffer_mutex;
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struct timer_list user_read_timer; /* user needs to claim result */
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struct work_struct work;
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struct mutex tpm_mutex; /* tpm is processing */
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struct tpm_vendor_specific vendor;
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struct dentry **bios_dir;
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struct list_head list;
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void (*release) (struct device *);
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};
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#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
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static inline int tpm_read_index(int base, int index)
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{
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outb(index, base);
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return inb(base+1) & 0xFF;
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}
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static inline void tpm_write_index(int base, int index, int value)
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{
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outb(index, base);
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outb(value & 0xFF, base+1);
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}
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extern void tpm_get_timeouts(struct tpm_chip *);
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extern void tpm_gen_interrupt(struct tpm_chip *);
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extern void tpm_continue_selftest(struct tpm_chip *);
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extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
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extern struct tpm_chip* tpm_register_hardware(struct device *,
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const struct tpm_vendor_specific *);
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extern int tpm_open(struct inode *, struct file *);
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extern int tpm_release(struct inode *, struct file *);
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extern ssize_t tpm_write(struct file *, const char __user *, size_t,
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loff_t *);
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extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
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extern void tpm_remove_hardware(struct device *);
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extern int tpm_pm_suspend(struct device *, pm_message_t);
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extern int tpm_pm_resume(struct device *);
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#ifdef CONFIG_ACPI
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extern struct dentry ** tpm_bios_log_setup(char *);
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extern void tpm_bios_log_teardown(struct dentry **);
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#else
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static inline struct dentry ** tpm_bios_log_setup(char *name)
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{
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return NULL;
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}
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static inline void tpm_bios_log_teardown(struct dentry **dir)
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{
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}
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#endif
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