[PATCH 03/14] efi: runtime-wrappers: Add a nonblocking version of QueryVariableInfo
From: Matt Fleming <hidden>
Date: 2016-02-01 22:07:22
Also in:
lkml
Subsystem:
extensible firmware interface (efi), the rest · Maintainers:
Ard Biesheuvel, Linus Torvalds
From: Ard Biesheuvel <redacted> This introduces a new runtime wrapper for the QueryVariableInfo() UEFI Runtime Service, which gives up immediately rather than spins on failure to grab the efi_runtime spinlock. This is required in the non-blocking path of the efi-pstore code. Signed-off-by: Ard Biesheuvel <redacted> Signed-off-by: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org> --- drivers/firmware/efi/runtime-wrappers.c | 22 ++++++++++++++++++++++ include/linux/efi.h | 1 + 2 files changed, 23 insertions(+)
diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
index 228bbf910461..e9f2867f0d91 100644
--- a/drivers/firmware/efi/runtime-wrappers.c
+++ b/drivers/firmware/efi/runtime-wrappers.c@@ -230,6 +230,27 @@ static efi_status_t virt_efi_query_variable_info(u32 attr, return status; } +static efi_status_t +virt_efi_query_variable_info_nonblocking(u32 attr, + u64 *storage_space, + u64 *remaining_space, + u64 *max_variable_size) +{ + unsigned long flags; + efi_status_t status; + + if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION) + return EFI_UNSUPPORTED; + + if (!spin_trylock_irqsave(&efi_runtime_lock, flags)) + return EFI_NOT_READY; + + status = efi_call_virt(query_variable_info, attr, storage_space, + remaining_space, max_variable_size); + spin_unlock_irqrestore(&efi_runtime_lock, flags); + return status; +} + static efi_status_t virt_efi_get_next_high_mono_count(u32 *count) { unsigned long flags;
@@ -300,6 +321,7 @@ void efi_native_runtime_setup(void) efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count; efi.reset_system = virt_efi_reset_system; efi.query_variable_info = virt_efi_query_variable_info; + efi.query_variable_info_nonblocking = virt_efi_query_variable_info_nonblocking; efi.update_capsule = virt_efi_update_capsule; efi.query_capsule_caps = virt_efi_query_capsule_caps; }
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 8706e0aabedc..ad1e177ba48e 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h@@ -849,6 +849,7 @@ extern struct efi { efi_set_variable_t *set_variable; efi_set_variable_t *set_variable_nonblocking; efi_query_variable_info_t *query_variable_info; + efi_query_variable_info_t *query_variable_info_nonblocking; efi_update_capsule_t *update_capsule; efi_query_capsule_caps_t *query_capsule_caps; efi_get_next_high_mono_count_t *get_next_high_mono_count;
--
2.6.2