315 lines
9.0 KiB
C
315 lines
9.0 KiB
C
/*
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* runtime-wrappers.c - Runtime Services function call wrappers
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*
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* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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*
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* Split off from arch/x86/platform/efi/efi.c
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*
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
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* Copyright (C) 1999-2002 Hewlett-Packard Co.
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* Copyright (C) 2005-2008 Intel Co.
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* Copyright (C) 2013 SuSE Labs
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*
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* This file is released under the GPLv2.
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*/
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#define pr_fmt(fmt) "efi: " fmt
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#include <linux/bug.h>
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#include <linux/efi.h>
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#include <linux/irqflags.h>
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#include <linux/mutex.h>
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#include <linux/semaphore.h>
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#include <linux/stringify.h>
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#include <asm/efi.h>
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/*
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* Wrap around the new efi_call_virt_generic() macros so that the
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* code doesn't get too cluttered:
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*/
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#define efi_call_virt(f, args...) \
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efi_call_virt_pointer(efi.systab->runtime, f, args)
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#define __efi_call_virt(f, args...) \
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__efi_call_virt_pointer(efi.systab->runtime, f, args)
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void efi_call_virt_check_flags(unsigned long flags, const char *call)
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{
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unsigned long cur_flags, mismatch;
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local_save_flags(cur_flags);
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mismatch = flags ^ cur_flags;
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if (!WARN_ON_ONCE(mismatch & ARCH_EFI_IRQ_FLAGS_MASK))
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return;
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add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_NOW_UNRELIABLE);
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pr_err_ratelimited(FW_BUG "IRQ flags corrupted (0x%08lx=>0x%08lx) by EFI %s\n",
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flags, cur_flags, call);
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local_irq_restore(flags);
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}
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/*
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* According to section 7.1 of the UEFI spec, Runtime Services are not fully
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* reentrant, and there are particular combinations of calls that need to be
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* serialized. (source: UEFI Specification v2.4A)
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*
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* Table 31. Rules for Reentry Into Runtime Services
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* +------------------------------------+-------------------------------+
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* | If previous call is busy in | Forbidden to call |
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* +------------------------------------+-------------------------------+
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* | Any | SetVirtualAddressMap() |
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* +------------------------------------+-------------------------------+
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* | ConvertPointer() | ConvertPointer() |
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* +------------------------------------+-------------------------------+
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* | SetVariable() | ResetSystem() |
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* | UpdateCapsule() | |
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* | SetTime() | |
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* | SetWakeupTime() | |
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* | GetNextHighMonotonicCount() | |
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* +------------------------------------+-------------------------------+
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* | GetVariable() | GetVariable() |
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* | GetNextVariableName() | GetNextVariableName() |
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* | SetVariable() | SetVariable() |
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* | QueryVariableInfo() | QueryVariableInfo() |
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* | UpdateCapsule() | UpdateCapsule() |
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* | QueryCapsuleCapabilities() | QueryCapsuleCapabilities() |
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* | GetNextHighMonotonicCount() | GetNextHighMonotonicCount() |
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* +------------------------------------+-------------------------------+
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* | GetTime() | GetTime() |
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* | SetTime() | SetTime() |
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* | GetWakeupTime() | GetWakeupTime() |
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* | SetWakeupTime() | SetWakeupTime() |
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* +------------------------------------+-------------------------------+
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*
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* Due to the fact that the EFI pstore may write to the variable store in
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* interrupt context, we need to use a lock for at least the groups that
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* contain SetVariable() and QueryVariableInfo(). That leaves little else, as
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* none of the remaining functions are actually ever called at runtime.
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* So let's just use a single lock to serialize all Runtime Services calls.
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*/
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static DEFINE_SEMAPHORE(efi_runtime_lock);
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static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(get_time, tm, tc);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_set_time(efi_time_t *tm)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(set_time, tm);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
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efi_bool_t *pending,
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efi_time_t *tm)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(get_wakeup_time, enabled, pending, tm);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(set_wakeup_time, enabled, tm);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_get_variable(efi_char16_t *name,
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efi_guid_t *vendor,
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u32 *attr,
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unsigned long *data_size,
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void *data)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(get_variable, name, vendor, attr, data_size,
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data);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
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efi_char16_t *name,
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efi_guid_t *vendor)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(get_next_variable, name_size, name, vendor);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_set_variable(efi_char16_t *name,
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efi_guid_t *vendor,
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u32 attr,
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unsigned long data_size,
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void *data)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(set_variable, name, vendor, attr, data_size,
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data);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t
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virt_efi_set_variable_nonblocking(efi_char16_t *name, efi_guid_t *vendor,
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u32 attr, unsigned long data_size,
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void *data)
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{
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efi_status_t status;
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if (down_trylock(&efi_runtime_lock))
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return EFI_NOT_READY;
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status = efi_call_virt(set_variable, name, vendor, attr, data_size,
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data);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_query_variable_info(u32 attr,
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u64 *storage_space,
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u64 *remaining_space,
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u64 *max_variable_size)
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{
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efi_status_t status;
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(query_variable_info, attr, storage_space,
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remaining_space, max_variable_size);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t
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virt_efi_query_variable_info_nonblocking(u32 attr,
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u64 *storage_space,
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u64 *remaining_space,
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u64 *max_variable_size)
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{
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efi_status_t status;
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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if (down_trylock(&efi_runtime_lock))
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return EFI_NOT_READY;
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status = efi_call_virt(query_variable_info, attr, storage_space,
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remaining_space, max_variable_size);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
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{
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efi_status_t status;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(get_next_high_mono_count, count);
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up(&efi_runtime_lock);
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return status;
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}
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static void virt_efi_reset_system(int reset_type,
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efi_status_t status,
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unsigned long data_size,
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efi_char16_t *data)
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{
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if (down_interruptible(&efi_runtime_lock)) {
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pr_warn("failed to invoke the reset_system() runtime service:\n"
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"could not get exclusive access to the firmware\n");
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return;
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}
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__efi_call_virt(reset_system, reset_type, status, data_size, data);
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up(&efi_runtime_lock);
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}
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static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
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unsigned long count,
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unsigned long sg_list)
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{
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efi_status_t status;
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(update_capsule, capsules, count, sg_list);
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up(&efi_runtime_lock);
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return status;
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}
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static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
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unsigned long count,
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u64 *max_size,
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int *reset_type)
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{
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efi_status_t status;
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if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
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return EFI_UNSUPPORTED;
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if (down_interruptible(&efi_runtime_lock))
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return EFI_ABORTED;
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status = efi_call_virt(query_capsule_caps, capsules, count, max_size,
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reset_type);
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up(&efi_runtime_lock);
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return status;
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}
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void efi_native_runtime_setup(void)
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{
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efi.get_time = virt_efi_get_time;
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efi.set_time = virt_efi_set_time;
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efi.get_wakeup_time = virt_efi_get_wakeup_time;
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efi.set_wakeup_time = virt_efi_set_wakeup_time;
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efi.get_variable = virt_efi_get_variable;
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efi.get_next_variable = virt_efi_get_next_variable;
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efi.set_variable = virt_efi_set_variable;
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efi.set_variable_nonblocking = virt_efi_set_variable_nonblocking;
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efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
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efi.reset_system = virt_efi_reset_system;
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efi.query_variable_info = virt_efi_query_variable_info;
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efi.query_variable_info_nonblocking = virt_efi_query_variable_info_nonblocking;
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efi.update_capsule = virt_efi_update_capsule;
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efi.query_capsule_caps = virt_efi_query_capsule_caps;
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}
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