diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 2ea2f1561e59..57d9794dac94 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -170,9 +170,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *dev, chip->dev.class = tpm_class; chip->dev.release = tpm_dev_release; chip->dev.parent = dev; -#ifdef CONFIG_ACPI chip->dev.groups = chip->groups; -#endif if (chip->dev_num == 0) chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR); @@ -277,14 +275,10 @@ static void tpm_del_char_device(struct tpm_chip *chip) static int tpm1_chip_register(struct tpm_chip *chip) { - int rc; - if (chip->flags & TPM_CHIP_FLAG_TPM2) return 0; - rc = tpm_sysfs_add_device(chip); - if (rc) - return rc; + tpm_sysfs_add_device(chip); chip->bios_dir = tpm_bios_log_setup(dev_name(&chip->dev)); @@ -298,10 +292,50 @@ static void tpm1_chip_unregister(struct tpm_chip *chip) if (chip->bios_dir) tpm_bios_log_teardown(chip->bios_dir); - - tpm_sysfs_del_device(chip); } +static void tpm_del_legacy_sysfs(struct tpm_chip *chip) +{ + struct attribute **i; + + if (chip->flags & TPM_CHIP_FLAG_TPM2) + return; + + sysfs_remove_link(&chip->dev.parent->kobj, "ppi"); + + for (i = chip->groups[0]->attrs; *i != NULL; ++i) + sysfs_remove_link(&chip->dev.parent->kobj, (*i)->name); +} + +/* For compatibility with legacy sysfs paths we provide symlinks from the + * parent dev directory to selected names within the tpm chip directory. Old + * kernel versions created these files directly under the parent. + */ +static int tpm_add_legacy_sysfs(struct tpm_chip *chip) +{ + struct attribute **i; + int rc; + + if (chip->flags & TPM_CHIP_FLAG_TPM2) + return 0; + + rc = __compat_only_sysfs_link_entry_to_kobj( + &chip->dev.parent->kobj, &chip->dev.kobj, "ppi"); + if (rc && rc != -ENOENT) + return rc; + + /* All the names from tpm-sysfs */ + for (i = chip->groups[0]->attrs; *i != NULL; ++i) { + rc = __compat_only_sysfs_link_entry_to_kobj( + &chip->dev.parent->kobj, &chip->dev.kobj, (*i)->name); + if (rc) { + tpm_del_legacy_sysfs(chip); + return rc; + } + } + + return 0; +} /* * tpm_chip_register() - create a character device for the TPM chip * @chip: TPM chip to use. @@ -324,24 +358,20 @@ int tpm_chip_register(struct tpm_chip *chip) tpm_add_ppi(chip); rc = tpm_add_char_device(chip); - if (rc) - goto out_err; + if (rc) { + tpm1_chip_unregister(chip); + return rc; + } chip->flags |= TPM_CHIP_FLAG_REGISTERED; - if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) { - rc = __compat_only_sysfs_link_entry_to_kobj( - &chip->dev.parent->kobj, &chip->dev.kobj, "ppi"); - if (rc && rc != -ENOENT) { - tpm_chip_unregister(chip); - return rc; - } + rc = tpm_add_legacy_sysfs(chip); + if (rc) { + tpm_chip_unregister(chip); + return rc; } return 0; -out_err: - tpm1_chip_unregister(chip); - return rc; } EXPORT_SYMBOL_GPL(tpm_chip_register); @@ -363,8 +393,7 @@ void tpm_chip_unregister(struct tpm_chip *chip) if (!(chip->flags & TPM_CHIP_FLAG_REGISTERED)) return; - if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) - sysfs_remove_link(&chip->dev.parent->kobj, "ppi"); + tpm_del_legacy_sysfs(chip); tpm1_chip_unregister(chip); tpm_del_char_device(chip); diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 7cba092e3069..080dade5e80f 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -432,12 +432,11 @@ static const struct tpm_input_header tpm_getcap_header = { .ordinal = TPM_ORD_GET_CAP }; -ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap, +ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap, const char *desc) { struct tpm_cmd_t tpm_cmd; int rc; - struct tpm_chip *chip = dev_get_drvdata(dev); tpm_cmd.header.in = tpm_getcap_header; if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) { @@ -935,7 +934,7 @@ static struct tpm_input_header savestate_header = { */ int tpm_pm_suspend(struct device *dev) { - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); struct tpm_cmd_t cmd; int rc, try; @@ -996,7 +995,7 @@ EXPORT_SYMBOL_GPL(tpm_pm_suspend); */ int tpm_pm_resume(struct device *dev) { - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); if (chip == NULL) return -ENODEV; diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index a7c3473c3421..b46cf70c8b16 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -36,7 +36,7 @@ static ssize_t pubek_show(struct device *dev, struct device_attribute *attr, int i, rc; char *str = buf; - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); tpm_cmd.header.in = tpm_readpubek_header; err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, @@ -92,9 +92,9 @@ static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr, ssize_t rc; int i, j, num_pcrs; char *str = buf; - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); - rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap, + rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap, "attempting to determine the number of PCRS"); if (rc) return 0; @@ -119,8 +119,8 @@ static ssize_t enabled_show(struct device *dev, struct device_attribute *attr, cap_t cap; ssize_t rc; - rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, - "attempting to determine the permanent enabled state"); + rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, + "attempting to determine the permanent enabled state"); if (rc) return 0; @@ -135,8 +135,8 @@ static ssize_t active_show(struct device *dev, struct device_attribute *attr, cap_t cap; ssize_t rc; - rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, - "attempting to determine the permanent active state"); + rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap, + "attempting to determine the permanent active state"); if (rc) return 0; @@ -151,8 +151,8 @@ static ssize_t owned_show(struct device *dev, struct device_attribute *attr, cap_t cap; ssize_t rc; - rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap, - "attempting to determine the owner state"); + rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap, + "attempting to determine the owner state"); if (rc) return 0; @@ -167,8 +167,8 @@ static ssize_t temp_deactivated_show(struct device *dev, cap_t cap; ssize_t rc; - rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap, - "attempting to determine the temporary state"); + rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap, + "attempting to determine the temporary state"); if (rc) return 0; @@ -180,11 +180,12 @@ static DEVICE_ATTR_RO(temp_deactivated); static ssize_t caps_show(struct device *dev, struct device_attribute *attr, char *buf) { + struct tpm_chip *chip = to_tpm_chip(dev); cap_t cap; ssize_t rc; char *str = buf; - rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, + rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap, "attempting to determine the manufacturer"); if (rc) return 0; @@ -192,8 +193,8 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, be32_to_cpu(cap.manufacturer_id)); /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */ - rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap, - "attempting to determine the 1.2 version"); + rc = tpm_getcap(chip, CAP_VERSION_1_2, &cap, + "attempting to determine the 1.2 version"); if (!rc) { str += sprintf(str, "TCG version: %d.%d\nFirmware version: %d.%d\n", @@ -203,7 +204,7 @@ static ssize_t caps_show(struct device *dev, struct device_attribute *attr, cap.tpm_version_1_2.revMinor); } else { /* Otherwise just use TPM_STRUCT_VER */ - rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap, + rc = tpm_getcap(chip, CAP_VERSION_1_1, &cap, "attempting to determine the 1.1 version"); if (rc) return 0; @@ -222,7 +223,7 @@ static DEVICE_ATTR_RO(caps); static ssize_t cancel_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); if (chip == NULL) return 0; @@ -234,7 +235,7 @@ static DEVICE_ATTR_WO(cancel); static ssize_t durations_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); if (chip->duration[TPM_LONG] == 0) return 0; @@ -251,7 +252,7 @@ static DEVICE_ATTR_RO(durations); static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr, char *buf) { - struct tpm_chip *chip = dev_get_drvdata(dev); + struct tpm_chip *chip = to_tpm_chip(dev); return sprintf(buf, "%d %d %d %d [%s]\n", jiffies_to_usecs(chip->timeout_a), @@ -281,24 +282,12 @@ static const struct attribute_group tpm_dev_group = { .attrs = tpm_dev_attrs, }; -int tpm_sysfs_add_device(struct tpm_chip *chip) +void tpm_sysfs_add_device(struct tpm_chip *chip) { - int err; - err = sysfs_create_group(&chip->dev.parent->kobj, - &tpm_dev_group); - - if (err) - dev_err(&chip->dev, - "failed to create sysfs attributes, %d\n", err); - return err; -} - -void tpm_sysfs_del_device(struct tpm_chip *chip) -{ - /* The sysfs routines rely on an implicit tpm_try_get_ops, this - * function is called before ops is null'd and the sysfs core - * synchronizes this removal so that no callbacks are running or can - * run again + /* The sysfs routines rely on an implicit tpm_try_get_ops, device_del + * is called before ops is null'd and the sysfs core synchronizes this + * removal so that no callbacks are running or can run again */ - sysfs_remove_group(&chip->dev.parent->kobj, &tpm_dev_group); + WARN_ON(chip->groups_cnt != 0); + chip->groups[chip->groups_cnt++] = &tpm_dev_group; } diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index 8bc6fb85fb38..508e8e00c9c1 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -168,9 +168,9 @@ struct tpm_chip { struct dentry **bios_dir; -#ifdef CONFIG_ACPI - const struct attribute_group *groups[2]; + const struct attribute_group *groups[3]; unsigned int groups_cnt; +#ifdef CONFIG_ACPI acpi_handle acpi_dev_handle; char ppi_version[TPM_PPI_VERSION_LEN + 1]; #endif /* CONFIG_ACPI */ @@ -471,7 +471,8 @@ extern dev_t tpm_devt; extern const struct file_operations tpm_fops; extern struct idr dev_nums_idr; -ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *); +ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap, + const char *desc); ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf, size_t bufsiz); ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len, @@ -496,8 +497,7 @@ extern struct tpm_chip *tpmm_chip_alloc(struct device *pdev, extern int tpm_chip_register(struct tpm_chip *chip); extern void tpm_chip_unregister(struct tpm_chip *chip); -int tpm_sysfs_add_device(struct tpm_chip *chip); -void tpm_sysfs_del_device(struct tpm_chip *chip); +void tpm_sysfs_add_device(struct tpm_chip *chip); int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);