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https://github.com/edk2-porting/linux-next.git
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efi: Don't use spinlocks for efi vars
All efivars operations are protected by a spinlock which prevents interruptions and preemption. This is too restricted, we just need a lock preventing concurrency. The idea is to use a semaphore of count 1 and to have two ways of locking, depending on the context: - In interrupt context, we call down_trylock(), if it fails we return an error - In normal context, we call down_interruptible() We don't use a mutex here because the mutex_trylock() function must not be called from interrupt context, whereas the down_trylock() can. Signed-off-by: Sylvain Chouleur <sylvain.chouleur@intel.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Sylvain Chouleur <sylvain.chouleur@gmail.com> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
This commit is contained in:
Sylvain Chouleur
Matt Fleming
parent
217b27d467
commit
21b3ddd39f
@ -125,16 +125,19 @@ static void efi_pstore_scan_sysfs_enter(struct efivar_entry *pos,
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* @entry: deleting entry
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* @turn_off_scanning: Check if a scanning flag should be turned off
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*/
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static inline void __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,
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static inline int __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,
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bool turn_off_scanning)
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{
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if (entry->deleting) {
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list_del(&entry->list);
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efivar_entry_iter_end();
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efivar_unregister(entry);
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efivar_entry_iter_begin();
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if (efivar_entry_iter_begin())
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return -EINTR;
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} else if (turn_off_scanning)
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entry->scanning = false;
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return 0;
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}
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/**
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@ -144,13 +147,18 @@ static inline void __efi_pstore_scan_sysfs_exit(struct efivar_entry *entry,
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* @head: list head
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* @stop: a flag checking if scanning will stop
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*/
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static void efi_pstore_scan_sysfs_exit(struct efivar_entry *pos,
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static int efi_pstore_scan_sysfs_exit(struct efivar_entry *pos,
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struct efivar_entry *next,
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struct list_head *head, bool stop)
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{
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__efi_pstore_scan_sysfs_exit(pos, true);
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int ret = __efi_pstore_scan_sysfs_exit(pos, true);
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if (ret)
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return ret;
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if (stop)
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__efi_pstore_scan_sysfs_exit(next, &next->list != head);
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ret = __efi_pstore_scan_sysfs_exit(next, &next->list != head);
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return ret;
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}
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/**
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@ -172,13 +180,17 @@ static int efi_pstore_sysfs_entry_iter(void *data, struct efivar_entry **pos)
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struct efivar_entry *entry, *n;
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struct list_head *head = &efivar_sysfs_list;
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int size = 0;
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int ret;
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if (!*pos) {
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list_for_each_entry_safe(entry, n, head, list) {
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efi_pstore_scan_sysfs_enter(entry, n, head);
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size = efi_pstore_read_func(entry, data);
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efi_pstore_scan_sysfs_exit(entry, n, head, size < 0);
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ret = efi_pstore_scan_sysfs_exit(entry, n, head,
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size < 0);
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if (ret)
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return ret;
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if (size)
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break;
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}
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@ -190,7 +202,9 @@ static int efi_pstore_sysfs_entry_iter(void *data, struct efivar_entry **pos)
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efi_pstore_scan_sysfs_enter((*pos), n, head);
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size = efi_pstore_read_func((*pos), data);
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efi_pstore_scan_sysfs_exit((*pos), n, head, size < 0);
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ret = efi_pstore_scan_sysfs_exit((*pos), n, head, size < 0);
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if (ret)
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return ret;
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if (size)
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break;
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}
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@ -232,7 +246,10 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
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if (!*data.buf)
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return -ENOMEM;
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efivar_entry_iter_begin();
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if (efivar_entry_iter_begin()) {
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kfree(*data.buf);
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return -EINTR;
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}
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size = efi_pstore_sysfs_entry_iter(&data,
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(struct efivar_entry **)&psi->data);
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efivar_entry_iter_end();
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@ -347,7 +364,8 @@ static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
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edata.time = time;
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edata.name = efi_name;
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efivar_entry_iter_begin();
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if (efivar_entry_iter_begin())
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return -EINTR;
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found = __efivar_entry_iter(efi_pstore_erase_func, &efivar_sysfs_list, &edata, &entry);
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if (found && !entry->scanning) {
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@ -510,7 +510,8 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
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vendor = del_var->VendorGuid;
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}
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efivar_entry_iter_begin();
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if (efivar_entry_iter_begin())
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return -EINTR;
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entry = efivar_entry_find(name, vendor, &efivar_sysfs_list, true);
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if (!entry)
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err = -EINVAL;
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@ -575,7 +576,10 @@ efivar_create_sysfs_entry(struct efivar_entry *new_var)
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return ret;
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kobject_uevent(&new_var->kobj, KOBJ_ADD);
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efivar_entry_add(new_var, &efivar_sysfs_list);
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if (efivar_entry_add(new_var, &efivar_sysfs_list)) {
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efivar_unregister(new_var);
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return -EINTR;
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}
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return 0;
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}
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@ -690,7 +694,10 @@ static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
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static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
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{
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efivar_entry_remove(entry);
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int err = efivar_entry_remove(entry);
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if (err)
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return err;
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efivar_unregister(entry);
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return 0;
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}
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@ -698,7 +705,14 @@ static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
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static void efivars_sysfs_exit(void)
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{
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/* Remove all entries and destroy */
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__efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL);
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int err;
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err = __efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list,
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NULL, NULL);
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if (err) {
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pr_err("efivars: Failed to destroy sysfs entries\n");
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return;
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}
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if (efivars_new_var)
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sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
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@ -43,7 +43,7 @@ static struct efivars *__efivars;
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* 2) ->ops calls
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* 3) (un)registration of __efivars
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*/
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static DEFINE_SPINLOCK(efivars_lock);
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static DEFINE_SEMAPHORE(efivars_lock);
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static bool efivar_wq_enabled = true;
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DECLARE_WORK(efivar_work, NULL);
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@ -442,7 +442,10 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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return -ENOMEM;
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}
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spin_lock_irq(&efivars_lock);
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if (down_interruptible(&efivars_lock)) {
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err = -EINTR;
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goto free;
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}
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/*
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* Per EFI spec, the maximum storage allocated for both
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@ -458,7 +461,7 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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switch (status) {
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case EFI_SUCCESS:
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if (duplicates)
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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variable_name_size = var_name_strnsize(variable_name,
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variable_name_size);
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@ -484,8 +487,12 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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status = EFI_NOT_FOUND;
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}
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if (duplicates)
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spin_lock_irq(&efivars_lock);
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if (duplicates) {
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if (down_interruptible(&efivars_lock)) {
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err = -EINTR;
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goto free;
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}
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}
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break;
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case EFI_NOT_FOUND:
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@ -499,8 +506,8 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
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} while (status != EFI_NOT_FOUND);
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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free:
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kfree(variable_name);
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return err;
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@ -511,24 +518,34 @@ EXPORT_SYMBOL_GPL(efivar_init);
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* efivar_entry_add - add entry to variable list
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* @entry: entry to add to list
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* @head: list head
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*
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* Returns 0 on success, or a kernel error code on failure.
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*/
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void efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
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int efivar_entry_add(struct efivar_entry *entry, struct list_head *head)
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{
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spin_lock_irq(&efivars_lock);
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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list_add(&entry->list, head);
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(efivar_entry_add);
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/**
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* efivar_entry_remove - remove entry from variable list
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* @entry: entry to remove from list
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*
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* Returns 0 on success, or a kernel error code on failure.
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*/
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void efivar_entry_remove(struct efivar_entry *entry)
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int efivar_entry_remove(struct efivar_entry *entry)
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{
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spin_lock_irq(&efivars_lock);
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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list_del(&entry->list);
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(efivar_entry_remove);
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@ -545,10 +562,8 @@ EXPORT_SYMBOL_GPL(efivar_entry_remove);
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*/
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static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
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{
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lockdep_assert_held(&efivars_lock);
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list_del(&entry->list);
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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}
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/**
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@ -571,8 +586,6 @@ int __efivar_entry_delete(struct efivar_entry *entry)
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const struct efivar_operations *ops = __efivars->ops;
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efi_status_t status;
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lockdep_assert_held(&efivars_lock);
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status = ops->set_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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0, 0, NULL);
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@ -589,20 +602,22 @@ EXPORT_SYMBOL_GPL(__efivar_entry_delete);
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* variable list. It is the caller's responsibility to free @entry
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* once we return.
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*
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* Returns 0 on success, or a converted EFI status code if
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* set_variable() fails.
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* Returns 0 on success, -EINTR if we can't grab the semaphore,
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* converted EFI status code if set_variable() fails.
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*/
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int efivar_entry_delete(struct efivar_entry *entry)
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{
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const struct efivar_operations *ops = __efivars->ops;
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efi_status_t status;
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spin_lock_irq(&efivars_lock);
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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status = ops->set_variable(entry->var.VariableName,
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&entry->var.VendorGuid,
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0, 0, NULL);
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if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) {
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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return efi_status_to_err(status);
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}
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@ -628,9 +643,9 @@ EXPORT_SYMBOL_GPL(efivar_entry_delete);
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* If @head is not NULL a lookup is performed to determine whether
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* the entry is already on the list.
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*
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* Returns 0 on success, -EEXIST if a lookup is performed and the entry
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* already exists on the list, or a converted EFI status code if
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* set_variable() fails.
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* Returns 0 on success, -EINTR if we can't grab the semaphore,
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* -EEXIST if a lookup is performed and the entry already exists on
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* the list, or a converted EFI status code if set_variable() fails.
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*/
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int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
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unsigned long size, void *data, struct list_head *head)
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@ -640,10 +655,10 @@ int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
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efi_char16_t *name = entry->var.VariableName;
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efi_guid_t vendor = entry->var.VendorGuid;
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spin_lock_irq(&efivars_lock);
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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if (head && efivar_entry_find(name, vendor, head, false)) {
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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return -EEXIST;
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}
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@ -652,7 +667,7 @@ int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
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status = ops->set_variable(name, &vendor,
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attributes, size, data);
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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return efi_status_to_err(status);
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@ -673,23 +688,22 @@ efivar_entry_set_nonblocking(efi_char16_t *name, efi_guid_t vendor,
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u32 attributes, unsigned long size, void *data)
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{
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const struct efivar_operations *ops = __efivars->ops;
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unsigned long flags;
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efi_status_t status;
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if (!spin_trylock_irqsave(&efivars_lock, flags))
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if (down_trylock(&efivars_lock))
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return -EBUSY;
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status = check_var_size_nonblocking(attributes,
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size + ucs2_strsize(name, 1024));
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if (status != EFI_SUCCESS) {
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spin_unlock_irqrestore(&efivars_lock, flags);
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up(&efivars_lock);
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return -ENOSPC;
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}
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status = ops->set_variable_nonblocking(name, &vendor, attributes,
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size, data);
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spin_unlock_irqrestore(&efivars_lock, flags);
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up(&efivars_lock);
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return efi_status_to_err(status);
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}
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@ -714,7 +728,6 @@ int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
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bool block, unsigned long size, void *data)
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{
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const struct efivar_operations *ops = __efivars->ops;
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unsigned long flags;
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efi_status_t status;
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if (!ops->query_variable_store)
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@ -735,21 +748,22 @@ int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
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size, data);
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if (!block) {
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if (!spin_trylock_irqsave(&efivars_lock, flags))
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if (down_trylock(&efivars_lock))
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return -EBUSY;
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} else {
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spin_lock_irqsave(&efivars_lock, flags);
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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}
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status = check_var_size(attributes, size + ucs2_strsize(name, 1024));
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if (status != EFI_SUCCESS) {
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spin_unlock_irqrestore(&efivars_lock, flags);
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up(&efivars_lock);
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return -ENOSPC;
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}
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status = ops->set_variable(name, &vendor, attributes, size, data);
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spin_unlock_irqrestore(&efivars_lock, flags);
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up(&efivars_lock);
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return efi_status_to_err(status);
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}
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@ -779,8 +793,6 @@ struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
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int strsize1, strsize2;
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bool found = false;
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lockdep_assert_held(&efivars_lock);
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list_for_each_entry_safe(entry, n, head, list) {
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strsize1 = ucs2_strsize(name, 1024);
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strsize2 = ucs2_strsize(entry->var.VariableName, 1024);
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@ -822,10 +834,11 @@ int efivar_entry_size(struct efivar_entry *entry, unsigned long *size)
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*size = 0;
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spin_lock_irq(&efivars_lock);
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if (down_interruptible(&efivars_lock))
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return -EINTR;
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status = ops->get_variable(entry->var.VariableName,
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&entry->var.VendorGuid, NULL, size, NULL);
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spin_unlock_irq(&efivars_lock);
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up(&efivars_lock);
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if (status != EFI_BUFFER_TOO_SMALL)
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return efi_status_to_err(status);
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@ -851,8 +864,6 @@ int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
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const struct efivar_operations *ops = __efivars->ops;
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efi_status_t status;
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lockdep_assert_held(&efivars_lock);
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|
||||
status = ops->get_variable(entry->var.VariableName,
|
||||
&entry->var.VendorGuid,
|
||||
attributes, size, data);
|
||||
@ -874,11 +885,12 @@ int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
|
||||
const struct efivar_operations *ops = __efivars->ops;
|
||||
efi_status_t status;
|
||||
|
||||
spin_lock_irq(&efivars_lock);
|
||||
if (down_interruptible(&efivars_lock))
|
||||
return -EINTR;
|
||||
status = ops->get_variable(entry->var.VariableName,
|
||||
&entry->var.VendorGuid,
|
||||
attributes, size, data);
|
||||
spin_unlock_irq(&efivars_lock);
|
||||
up(&efivars_lock);
|
||||
|
||||
return efi_status_to_err(status);
|
||||
}
|
||||
@ -925,7 +937,8 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
|
||||
* set_variable call, and removal of the variable from the efivars
|
||||
* list (in the case of an authenticated delete).
|
||||
*/
|
||||
spin_lock_irq(&efivars_lock);
|
||||
if (down_interruptible(&efivars_lock))
|
||||
return -EINTR;
|
||||
|
||||
/*
|
||||
* Ensure that the available space hasn't shrunk below the safe level
|
||||
@ -965,7 +978,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
|
||||
if (status == EFI_NOT_FOUND)
|
||||
efivar_entry_list_del_unlock(entry);
|
||||
else
|
||||
spin_unlock_irq(&efivars_lock);
|
||||
up(&efivars_lock);
|
||||
|
||||
if (status && status != EFI_BUFFER_TOO_SMALL)
|
||||
return efi_status_to_err(status);
|
||||
@ -973,7 +986,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
|
||||
return 0;
|
||||
|
||||
out:
|
||||
spin_unlock_irq(&efivars_lock);
|
||||
up(&efivars_lock);
|
||||
return err;
|
||||
|
||||
}
|
||||
@ -986,9 +999,9 @@ EXPORT_SYMBOL_GPL(efivar_entry_set_get_size);
|
||||
* efivar_entry_iter_end() is called. This function is usually used in
|
||||
* conjunction with __efivar_entry_iter() or efivar_entry_iter().
|
||||
*/
|
||||
void efivar_entry_iter_begin(void)
|
||||
int efivar_entry_iter_begin(void)
|
||||
{
|
||||
spin_lock_irq(&efivars_lock);
|
||||
return down_interruptible(&efivars_lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(efivar_entry_iter_begin);
|
||||
|
||||
@ -999,7 +1012,7 @@ EXPORT_SYMBOL_GPL(efivar_entry_iter_begin);
|
||||
*/
|
||||
void efivar_entry_iter_end(void)
|
||||
{
|
||||
spin_unlock_irq(&efivars_lock);
|
||||
up(&efivars_lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(efivar_entry_iter_end);
|
||||
|
||||
@ -1075,7 +1088,9 @@ int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
|
||||
{
|
||||
int err = 0;
|
||||
|
||||
efivar_entry_iter_begin();
|
||||
err = efivar_entry_iter_begin();
|
||||
if (err)
|
||||
return err;
|
||||
err = __efivar_entry_iter(func, head, data, NULL);
|
||||
efivar_entry_iter_end();
|
||||
|
||||
@ -1120,12 +1135,17 @@ int efivars_register(struct efivars *efivars,
|
||||
const struct efivar_operations *ops,
|
||||
struct kobject *kobject)
|
||||
{
|
||||
spin_lock_irq(&efivars_lock);
|
||||
if (down_interruptible(&efivars_lock))
|
||||
return -EINTR;
|
||||
|
||||
efivars->ops = ops;
|
||||
efivars->kobject = kobject;
|
||||
|
||||
__efivars = efivars;
|
||||
spin_unlock_irq(&efivars_lock);
|
||||
|
||||
pr_info("Registered efivars operations\n");
|
||||
|
||||
up(&efivars_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
@ -1142,7 +1162,9 @@ int efivars_unregister(struct efivars *efivars)
|
||||
{
|
||||
int rv;
|
||||
|
||||
spin_lock_irq(&efivars_lock);
|
||||
if (down_interruptible(&efivars_lock))
|
||||
return -EINTR;
|
||||
|
||||
if (!__efivars) {
|
||||
printk(KERN_ERR "efivars not registered\n");
|
||||
rv = -EINVAL;
|
||||
@ -1154,11 +1176,12 @@ int efivars_unregister(struct efivars *efivars)
|
||||
goto out;
|
||||
}
|
||||
|
||||
pr_info("Unregistered efivars operations\n");
|
||||
__efivars = NULL;
|
||||
|
||||
rv = 0;
|
||||
out:
|
||||
spin_unlock_irq(&efivars_lock);
|
||||
up(&efivars_lock);
|
||||
return rv;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(efivars_unregister);
|
||||
|
||||
@ -105,7 +105,10 @@ static int efivarfs_create(struct inode *dir, struct dentry *dentry,
|
||||
|
||||
inode->i_private = var;
|
||||
|
||||
efivar_entry_add(var, &efivarfs_list);
|
||||
err = efivar_entry_add(var, &efivarfs_list);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
d_instantiate(dentry, inode);
|
||||
dget(dentry);
|
||||
out:
|
||||
|
||||
@ -161,7 +161,9 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
|
||||
kfree(name);
|
||||
|
||||
efivar_entry_size(entry, &size);
|
||||
efivar_entry_add(entry, &efivarfs_list);
|
||||
err = efivar_entry_add(entry, &efivarfs_list);
|
||||
if (err)
|
||||
goto fail_inode;
|
||||
|
||||
inode_lock(inode);
|
||||
inode->i_private = entry;
|
||||
@ -182,7 +184,10 @@ fail:
|
||||
|
||||
static int efivarfs_destroy(struct efivar_entry *entry, void *data)
|
||||
{
|
||||
efivar_entry_remove(entry);
|
||||
int err = efivar_entry_remove(entry);
|
||||
|
||||
if (err)
|
||||
return err;
|
||||
kfree(entry);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1297,8 +1297,8 @@ struct kobject *efivars_kobject(void);
|
||||
int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
|
||||
void *data, bool duplicates, struct list_head *head);
|
||||
|
||||
void efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
|
||||
void efivar_entry_remove(struct efivar_entry *entry);
|
||||
int efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
|
||||
int efivar_entry_remove(struct efivar_entry *entry);
|
||||
|
||||
int __efivar_entry_delete(struct efivar_entry *entry);
|
||||
int efivar_entry_delete(struct efivar_entry *entry);
|
||||
@ -1315,7 +1315,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
|
||||
int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
|
||||
bool block, unsigned long size, void *data);
|
||||
|
||||
void efivar_entry_iter_begin(void);
|
||||
int efivar_entry_iter_begin(void);
|
||||
void efivar_entry_iter_end(void);
|
||||
|
||||
int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
|
||||
|
||||
Loading…
Reference in New Issue
Block a user