[mirror_ubuntu-eoan-kernel.git] / drivers / firmware / efi / runtime-wrappers.c

/*
 * runtime-wrappers.c - Runtime Services function call wrappers
 *
 * Implementation summary:
 * -----------------------
 * 1. When user/kernel thread requests to execute efi_runtime_service(),
 * enqueue work to efi_rts_wq.
 * 2. Caller thread waits for completion until the work is finished
 * because it's dependent on the return status and execution of
 * efi_runtime_service().
 * For instance, get_variable() and get_next_variable().
 *
 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
 *
 * Split off from arch/x86/platform/efi/efi.c
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999-2002 Hewlett-Packard Co.
 * Copyright (C) 2005-2008 Intel Co.
 * Copyright (C) 2013 SuSE Labs
 *
 * This file is released under the GPLv2.
 */

#define pr_fmt(fmt)	"efi: " fmt

#include <linux/bug.h>
#include <linux/efi.h>
#include <linux/irqflags.h>
#include <linux/mutex.h>
#include <linux/semaphore.h>
#include <linux/stringify.h>
#include <linux/workqueue.h>
#include <linux/completion.h>

#include <asm/efi.h>

/*
 * Wrap around the new efi_call_virt_generic() macros so that the
 * code doesn't get too cluttered:
 */
#define efi_call_virt(f, args...)   \
	efi_call_virt_pointer(efi.systab->runtime, f, args)
#define __efi_call_virt(f, args...) \
	__efi_call_virt_pointer(efi.systab->runtime, f, args)

struct efi_runtime_work efi_rts_work;

/*
 * efi_queue_work:	Queue efi_runtime_service() and wait until it's done
 * @rts:		efi_runtime_service() function identifier
 * @rts_arg<1-5>:	efi_runtime_service() function arguments
 *
 * Accesses to efi_runtime_services() are serialized by a binary
 * semaphore (efi_runtime_lock) and caller waits until the work is
 * finished, hence _only_ one work is queued at a time and the caller
 * thread waits for completion.
 */
#define efi_queue_work(_rts, _arg1, _arg2, _arg3, _arg4, _arg5)		\
({									\
	efi_rts_work.status = EFI_ABORTED;				\
									\
	if (!efi_enabled(EFI_RUNTIME_SERVICES)) {			\
		pr_warn_once("EFI Runtime Services are disabled!\n");	\
		goto exit;						\
	}								\
									\
	init_completion(&efi_rts_work.efi_rts_comp);			\
	INIT_WORK(&efi_rts_work.work, efi_call_rts);			\
	efi_rts_work.arg1 = _arg1;					\
	efi_rts_work.arg2 = _arg2;					\
	efi_rts_work.arg3 = _arg3;					\
	efi_rts_work.arg4 = _arg4;					\
	efi_rts_work.arg5 = _arg5;					\
	efi_rts_work.efi_rts_id = _rts;					\
									\
	/*								\
	 * queue_work() returns 0 if work was already on queue,         \
	 * _ideally_ this should never happen.                          \
	 */								\
	if (queue_work(efi_rts_wq, &efi_rts_work.work))			\
		wait_for_completion(&efi_rts_work.efi_rts_comp);	\
	else								\
		pr_err("Failed to queue work to efi_rts_wq.\n");	\
									\
exit:									\
	efi_rts_work.efi_rts_id = NONE;					\
	efi_rts_work.status;						\
})

void efi_call_virt_check_flags(unsigned long flags, const char *call)
{
	unsigned long cur_flags, mismatch;

	local_save_flags(cur_flags);

	mismatch = flags ^ cur_flags;
	if (!WARN_ON_ONCE(mismatch & ARCH_EFI_IRQ_FLAGS_MASK))
		return;

	add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_NOW_UNRELIABLE);
	pr_err_ratelimited(FW_BUG "IRQ flags corrupted (0x%08lx=>0x%08lx) by EFI %s\n",
			   flags, cur_flags, call);
	local_irq_restore(flags);
}

/*
 * According to section 7.1 of the UEFI spec, Runtime Services are not fully
 * reentrant, and there are particular combinations of calls that need to be
 * serialized. (source: UEFI Specification v2.4A)
 *
 * Table 31. Rules for Reentry Into Runtime Services
 * +------------------------------------+-------------------------------+
 * | If previous call is busy in	| Forbidden to call		|
 * +------------------------------------+-------------------------------+
 * | Any				| SetVirtualAddressMap()	|
 * +------------------------------------+-------------------------------+
 * | ConvertPointer()			| ConvertPointer()		|
 * +------------------------------------+-------------------------------+
 * | SetVariable()			| ResetSystem()			|
 * | UpdateCapsule()			|				|
 * | SetTime()				|				|
 * | SetWakeupTime()			|				|
 * | GetNextHighMonotonicCount()	|				|
 * +------------------------------------+-------------------------------+
 * | GetVariable()			| GetVariable()			|
 * | GetNextVariableName()		| GetNextVariableName()		|
 * | SetVariable()			| SetVariable()			|
 * | QueryVariableInfo()		| QueryVariableInfo()		|
 * | UpdateCapsule()			| UpdateCapsule()		|
 * | QueryCapsuleCapabilities()		| QueryCapsuleCapabilities()	|
 * | GetNextHighMonotonicCount()	| GetNextHighMonotonicCount()	|
 * +------------------------------------+-------------------------------+
 * | GetTime()				| GetTime()			|
 * | SetTime()				| SetTime()			|
 * | GetWakeupTime()			| GetWakeupTime()		|
 * | SetWakeupTime()			| SetWakeupTime()		|
 * +------------------------------------+-------------------------------+
 *
 * Due to the fact that the EFI pstore may write to the variable store in
 * interrupt context, we need to use a lock for at least the groups that
 * contain SetVariable() and QueryVariableInfo(). That leaves little else, as
 * none of the remaining functions are actually ever called at runtime.
 * So let's just use a single lock to serialize all Runtime Services calls.
 */
static DEFINE_SEMAPHORE(efi_runtime_lock);

/*
 * Expose the EFI runtime lock to the UV platform
 */
#ifdef CONFIG_X86_UV
extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock);
#endif

/*
 * Calls the appropriate efi_runtime_service() with the appropriate
 * arguments.
 *
 * Semantics followed by efi_call_rts() to understand efi_runtime_work:
 * 1. If argument was a pointer, recast it from void pointer to original
 * pointer type.
 * 2. If argument was a value, recast it from void pointer to original
 * pointer type and dereference it.
 */
static void efi_call_rts(struct work_struct *work)
{
	void *arg1, *arg2, *arg3, *arg4, *arg5;
	efi_status_t status = EFI_NOT_FOUND;

	arg1 = efi_rts_work.arg1;
	arg2 = efi_rts_work.arg2;
	arg3 = efi_rts_work.arg3;
	arg4 = efi_rts_work.arg4;
	arg5 = efi_rts_work.arg5;

	switch (efi_rts_work.efi_rts_id) {
	case GET_TIME:
		status = efi_call_virt(get_time, (efi_time_t *)arg1,
				       (efi_time_cap_t *)arg2);
		break;
	case SET_TIME:
		status = efi_call_virt(set_time, (efi_time_t *)arg1);
		break;
	case GET_WAKEUP_TIME:
		status = efi_call_virt(get_wakeup_time, (efi_bool_t *)arg1,
				       (efi_bool_t *)arg2, (efi_time_t *)arg3);
		break;
	case SET_WAKEUP_TIME:
		status = efi_call_virt(set_wakeup_time, *(efi_bool_t *)arg1,
				       (efi_time_t *)arg2);
		break;
	case GET_VARIABLE:
		status = efi_call_virt(get_variable, (efi_char16_t *)arg1,
				       (efi_guid_t *)arg2, (u32 *)arg3,
				       (unsigned long *)arg4, (void *)arg5);
		break;
	case GET_NEXT_VARIABLE:
		status = efi_call_virt(get_next_variable, (unsigned long *)arg1,
				       (efi_char16_t *)arg2,
				       (efi_guid_t *)arg3);
		break;
	case SET_VARIABLE:
		status = efi_call_virt(set_variable, (efi_char16_t *)arg1,
				       (efi_guid_t *)arg2, *(u32 *)arg3,
				       *(unsigned long *)arg4, (void *)arg5);
		break;
	case QUERY_VARIABLE_INFO:
		status = efi_call_virt(query_variable_info, *(u32 *)arg1,
				       (u64 *)arg2, (u64 *)arg3, (u64 *)arg4);
		break;
	case GET_NEXT_HIGH_MONO_COUNT:
		status = efi_call_virt(get_next_high_mono_count, (u32 *)arg1);
		break;
	case UPDATE_CAPSULE:
		status = efi_call_virt(update_capsule,
				       (efi_capsule_header_t **)arg1,
				       *(unsigned long *)arg2,
				       *(unsigned long *)arg3);
		break;
	case QUERY_CAPSULE_CAPS:
		status = efi_call_virt(query_capsule_caps,
				       (efi_capsule_header_t **)arg1,
				       *(unsigned long *)arg2, (u64 *)arg3,
				       (int *)arg4);
		break;
	default:
		/*
		 * Ideally, we should never reach here because a caller of this
		 * function should have put the right efi_runtime_service()
		 * function identifier into efi_rts_work->efi_rts_id
		 */
		pr_err("Requested executing invalid EFI Runtime Service.\n");
	}
	efi_rts_work.status = status;
	complete(&efi_rts_work.efi_rts_comp);
}

static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(GET_TIME, tm, tc, NULL, NULL, NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_set_time(efi_time_t *tm)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(SET_TIME, tm, NULL, NULL, NULL, NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
					     efi_bool_t *pending,
					     efi_time_t *tm)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(GET_WAKEUP_TIME, enabled, pending, tm, NULL,
				NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(SET_WAKEUP_TIME, &enabled, tm, NULL, NULL,
				NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_get_variable(efi_char16_t *name,
					  efi_guid_t *vendor,
					  u32 *attr,
					  unsigned long *data_size,
					  void *data)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(GET_VARIABLE, name, vendor, attr, data_size,
				data);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
					       efi_char16_t *name,
					       efi_guid_t *vendor)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(GET_NEXT_VARIABLE, name_size, name, vendor,
				NULL, NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_set_variable(efi_char16_t *name,
					  efi_guid_t *vendor,
					  u32 attr,
					  unsigned long data_size,
					  void *data)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(SET_VARIABLE, name, vendor, &attr, &data_size,
				data);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t
virt_efi_set_variable_nonblocking(efi_char16_t *name, efi_guid_t *vendor,
				  u32 attr, unsigned long data_size,
				  void *data)
{
	efi_status_t status;

	if (down_trylock(&efi_runtime_lock))
		return EFI_NOT_READY;

	status = efi_call_virt(set_variable, name, vendor, attr, data_size,
			       data);
	up(&efi_runtime_lock);
	return status;
}


static efi_status_t virt_efi_query_variable_info(u32 attr,
						 u64 *storage_space,
						 u64 *remaining_space,
						 u64 *max_variable_size)
{
	efi_status_t status;

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(QUERY_VARIABLE_INFO, &attr, storage_space,
				remaining_space, max_variable_size, NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t
virt_efi_query_variable_info_nonblocking(u32 attr,
					 u64 *storage_space,
					 u64 *remaining_space,
					 u64 *max_variable_size)
{
	efi_status_t status;

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	if (down_trylock(&efi_runtime_lock))
		return EFI_NOT_READY;

	status = efi_call_virt(query_variable_info, attr, storage_space,
			       remaining_space, max_variable_size);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
	efi_status_t status;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(GET_NEXT_HIGH_MONO_COUNT, count, NULL, NULL,
				NULL, NULL);
	up(&efi_runtime_lock);
	return status;
}

static void virt_efi_reset_system(int reset_type,
				  efi_status_t status,
				  unsigned long data_size,
				  efi_char16_t *data)
{
	if (down_interruptible(&efi_runtime_lock)) {
		pr_warn("failed to invoke the reset_system() runtime service:\n"
			"could not get exclusive access to the firmware\n");
		return;
	}
	efi_rts_work.efi_rts_id = RESET_SYSTEM;
	__efi_call_virt(reset_system, reset_type, status, data_size, data);
	up(&efi_runtime_lock);
}

static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
					    unsigned long count,
					    unsigned long sg_list)
{
	efi_status_t status;

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(UPDATE_CAPSULE, capsules, &count, &sg_list,
				NULL, NULL);
	up(&efi_runtime_lock);
	return status;
}

static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
						unsigned long count,
						u64 *max_size,
						int *reset_type)
{
	efi_status_t status;

	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
		return EFI_UNSUPPORTED;

	if (down_interruptible(&efi_runtime_lock))
		return EFI_ABORTED;
	status = efi_queue_work(QUERY_CAPSULE_CAPS, capsules, &count,
				max_size, reset_type, NULL);
	up(&efi_runtime_lock);
	return status;
}

void efi_native_runtime_setup(void)
{
	efi.get_time = virt_efi_get_time;
	efi.set_time = virt_efi_set_time;
	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	efi.get_variable = virt_efi_get_variable;
	efi.get_next_variable = virt_efi_get_next_variable;
	efi.set_variable = virt_efi_set_variable;
	efi.set_variable_nonblocking = virt_efi_set_variable_nonblocking;
	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;
}
Commit	Line	Data
022ee6c5 AB	1	/*
	2	* runtime-wrappers.c - Runtime Services function call wrappers
	3	*
3eb420e7 SP	4	* Implementation summary:
	5	* -----------------------
	6	* 1. When user/kernel thread requests to execute efi_runtime_service(),
	7	* enqueue work to efi_rts_wq.
	8	* 2. Caller thread waits for completion until the work is finished
	9	* because it's dependent on the return status and execution of
	10	* efi_runtime_service().
	11	* For instance, get_variable() and get_next_variable().
	12	*
022ee6c5 AB	13	* Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
	14	*
	15	* Split off from arch/x86/platform/efi/efi.c
	16	*
	17	* Copyright (C) 1999 VA Linux Systems
	18	* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	19	* Copyright (C) 1999-2002 Hewlett-Packard Co.
	20	* Copyright (C) 2005-2008 Intel Co.
	21	* Copyright (C) 2013 SuSE Labs
	22	*
	23	* This file is released under the GPLv2.
	24	*/
	25
dce48e35 AB	26	#define pr_fmt(fmt) "efi: " fmt
dce48e35 AB	27
161485e8	28	#include <linux/bug.h>
022ee6c5	29	#include <linux/efi.h>
1d04ba17	30	#include <linux/irqflags.h>
161485e8	31	#include <linux/mutex.h>
dce48e35	32	#include <linux/semaphore.h>
1d04ba17	33	#include <linux/stringify.h>
3eb420e7 SP	34	#include <linux/workqueue.h>
	35	#include <linux/completion.h>
	36
022ee6c5 AB	37	#include <asm/efi.h>
022ee6c5 AB	38
80e75596 AT	39	/*
	40	* Wrap around the new efi_call_virt_generic() macros so that the
	41	* code doesn't get too cluttered:
	42	*/
	43	#define efi_call_virt(f, args...) \
	44	efi_call_virt_pointer(efi.systab->runtime, f, args)
	45	#define __efi_call_virt(f, args...) \
	46	__efi_call_virt_pointer(efi.systab->runtime, f, args)
	47
9dbbedaa	48	struct efi_runtime_work efi_rts_work;
3eb420e7 SP	49
	50	/*
	51	* efi_queue_work: Queue efi_runtime_service() and wait until it's done
	52	* @rts: efi_runtime_service() function identifier
	53	* @rts_arg<1-5>: efi_runtime_service() function arguments
	54	*
	55	* Accesses to efi_runtime_services() are serialized by a binary
	56	* semaphore (efi_runtime_lock) and caller waits until the work is
	57	* finished, hence _only_ one work is queued at a time and the caller
	58	* thread waits for completion.
	59	*/
	60	#define efi_queue_work(_rts, _arg1, _arg2, _arg3, _arg4, _arg5) \
	61	({ \
3eb420e7 SP	62	efi_rts_work.status = EFI_ABORTED; \
3eb420e7 SP	63	\
3425d934 SP	64	if (!efi_enabled(EFI_RUNTIME_SERVICES)) { \
	65	pr_warn_once("EFI Runtime Services are disabled!\n"); \
	66	goto exit; \
	67	} \
	68	\
3eb420e7	69	init_completion(&efi_rts_work.efi_rts_comp); \
ef1491e7	70	INIT_WORK(&efi_rts_work.work, efi_call_rts); \
3eb420e7 SP	71	efi_rts_work.arg1 = _arg1; \
	72	efi_rts_work.arg2 = _arg2; \
	73	efi_rts_work.arg3 = _arg3; \
	74	efi_rts_work.arg4 = _arg4; \
	75	efi_rts_work.arg5 = _arg5; \
	76	efi_rts_work.efi_rts_id = _rts; \
	77	\
	78	/* \
	79	* queue_work() returns 0 if work was already on queue, \
	80	* _ideally_ this should never happen. \
	81	*/ \
	82	if (queue_work(efi_rts_wq, &efi_rts_work.work)) \
	83	wait_for_completion(&efi_rts_work.efi_rts_comp); \
	84	else \
	85	pr_err("Failed to queue work to efi_rts_wq.\n"); \
	86	\
3425d934 SP	87	exit: \
3425d934 SP	88	efi_rts_work.efi_rts_id = NONE; \
3eb420e7 SP	89	efi_rts_work.status; \
	90	})
	91
80e75596	92	void efi_call_virt_check_flags(unsigned long flags, const char *call)
1d04ba17 MR	93	{
	94	unsigned long cur_flags, mismatch;
	95
	96	local_save_flags(cur_flags);
	97
	98	mismatch = flags ^ cur_flags;
	99	if (!WARN_ON_ONCE(mismatch & ARCH_EFI_IRQ_FLAGS_MASK))
	100	return;
	101
	102	add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_NOW_UNRELIABLE);
	103	pr_err_ratelimited(FW_BUG "IRQ flags corrupted (0x%08lx=>0x%08lx) by EFI %s\n",
	104	flags, cur_flags, call);
	105	local_irq_restore(flags);
	106	}
1d04ba17	107
161485e8 AB	108	/*
	109	* According to section 7.1 of the UEFI spec, Runtime Services are not fully
	110	* reentrant, and there are particular combinations of calls that need to be
	111	* serialized. (source: UEFI Specification v2.4A)
	112	*
	113	* Table 31. Rules for Reentry Into Runtime Services
	114	* +------------------------------------+-------------------------------+
	115	* \| If previous call is busy in \| Forbidden to call \|
	116	* +------------------------------------+-------------------------------+
	117	* \| Any \| SetVirtualAddressMap() \|
	118	* +------------------------------------+-------------------------------+
	119	* \| ConvertPointer() \| ConvertPointer() \|
	120	* +------------------------------------+-------------------------------+
	121	* \| SetVariable() \| ResetSystem() \|
	122	* \| UpdateCapsule() \| \|
	123	* \| SetTime() \| \|
	124	* \| SetWakeupTime() \| \|
	125	* \| GetNextHighMonotonicCount() \| \|
	126	* +------------------------------------+-------------------------------+
	127	* \| GetVariable() \| GetVariable() \|
	128	* \| GetNextVariableName() \| GetNextVariableName() \|
	129	* \| SetVariable() \| SetVariable() \|
	130	* \| QueryVariableInfo() \| QueryVariableInfo() \|
	131	* \| UpdateCapsule() \| UpdateCapsule() \|
	132	* \| QueryCapsuleCapabilities() \| QueryCapsuleCapabilities() \|
	133	* \| GetNextHighMonotonicCount() \| GetNextHighMonotonicCount() \|
	134	* +------------------------------------+-------------------------------+
	135	* \| GetTime() \| GetTime() \|
	136	* \| SetTime() \| SetTime() \|
	137	* \| GetWakeupTime() \| GetWakeupTime() \|
	138	* \| SetWakeupTime() \| SetWakeupTime() \|
	139	* +------------------------------------+-------------------------------+
	140	*
	141	* Due to the fact that the EFI pstore may write to the variable store in
dce48e35	142	* interrupt context, we need to use a lock for at least the groups that
161485e8 AB	143	* contain SetVariable() and QueryVariableInfo(). That leaves little else, as
161485e8 AB	144	* none of the remaining functions are actually ever called at runtime.
dce48e35	145	* So let's just use a single lock to serialize all Runtime Services calls.
161485e8	146	*/
dce48e35	147	static DEFINE_SEMAPHORE(efi_runtime_lock);
161485e8	148
f331e766 HB	149	/*
	150	* Expose the EFI runtime lock to the UV platform
	151	*/
	152	#ifdef CONFIG_X86_UV
	153	extern struct semaphore __efi_uv_runtime_lock __alias(efi_runtime_lock);
	154	#endif
	155
3eb420e7 SP	156	/*
	157	* Calls the appropriate efi_runtime_service() with the appropriate
	158	* arguments.
	159	*
	160	* Semantics followed by efi_call_rts() to understand efi_runtime_work:
	161	* 1. If argument was a pointer, recast it from void pointer to original
	162	* pointer type.
	163	* 2. If argument was a value, recast it from void pointer to original
	164	* pointer type and dereference it.
	165	*/
	166	static void efi_call_rts(struct work_struct *work)
	167	{
3eb420e7 SP	168	void arg1, arg2, arg3, arg4, *arg5;
	169	efi_status_t status = EFI_NOT_FOUND;
	170
9dbbedaa SP	171	arg1 = efi_rts_work.arg1;
	172	arg2 = efi_rts_work.arg2;
	173	arg3 = efi_rts_work.arg3;
	174	arg4 = efi_rts_work.arg4;
	175	arg5 = efi_rts_work.arg5;
3eb420e7	176
9dbbedaa	177	switch (efi_rts_work.efi_rts_id) {
3eb420e7 SP	178	case GET_TIME:
	179	status = efi_call_virt(get_time, (efi_time_t *)arg1,
	180	(efi_time_cap_t *)arg2);
	181	break;
	182	case SET_TIME:
	183	status = efi_call_virt(set_time, (efi_time_t *)arg1);
	184	break;
	185	case GET_WAKEUP_TIME:
	186	status = efi_call_virt(get_wakeup_time, (efi_bool_t *)arg1,
	187	(efi_bool_t )arg2, (efi_time_t )arg3);
	188	break;
	189	case SET_WAKEUP_TIME:
	190	status = efi_call_virt(set_wakeup_time, (efi_bool_t )arg1,
	191	(efi_time_t *)arg2);
	192	break;
	193	case GET_VARIABLE:
	194	status = efi_call_virt(get_variable, (efi_char16_t *)arg1,
	195	(efi_guid_t )arg2, (u32 )arg3,
	196	(unsigned long )arg4, (void )arg5);
	197	break;
	198	case GET_NEXT_VARIABLE:
	199	status = efi_call_virt(get_next_variable, (unsigned long *)arg1,
	200	(efi_char16_t *)arg2,
	201	(efi_guid_t *)arg3);
	202	break;
	203	case SET_VARIABLE:
	204	status = efi_call_virt(set_variable, (efi_char16_t *)arg1,
	205	(efi_guid_t )arg2, (u32 *)arg3,
	206	(unsigned long )arg4, (void *)arg5);
	207	break;
	208	case QUERY_VARIABLE_INFO:
	209	status = efi_call_virt(query_variable_info, (u32 )arg1,
	210	(u64 )arg2, (u64 )arg3, (u64 *)arg4);
	211	break;
	212	case GET_NEXT_HIGH_MONO_COUNT:
	213	status = efi_call_virt(get_next_high_mono_count, (u32 *)arg1);
	214	break;
	215	case UPDATE_CAPSULE:
	216	status = efi_call_virt(update_capsule,
	217	(efi_capsule_header_t **)arg1,
	218	(unsigned long )arg2,
	219	(unsigned long )arg3);
	220	break;
	221	case QUERY_CAPSULE_CAPS:
	222	status = efi_call_virt(query_capsule_caps,
	223	(efi_capsule_header_t **)arg1,
	224	(unsigned long )arg2, (u64 *)arg3,
	225	(int *)arg4);
	226	break;
	227	default:
	228	/*
	229	* Ideally, we should never reach here because a caller of this
	230	* function should have put the right efi_runtime_service()
	231	* function identifier into efi_rts_work->efi_rts_id
	232	*/
	233	pr_err("Requested executing invalid EFI Runtime Service.\n");
	234	}
9dbbedaa SP	235	efi_rts_work.status = status;
9dbbedaa SP	236	complete(&efi_rts_work.efi_rts_comp);
3eb420e7 SP	237	}
3eb420e7 SP	238
022ee6c5 AB	239	static efi_status_t virt_efi_get_time(efi_time_t tm, efi_time_cap_t tc)
022ee6c5 AB	240	{
022ee6c5 AB	241	efi_status_t status;
022ee6c5 AB	242
dce48e35 AB	243	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	244	return EFI_ABORTED;
3eb420e7	245	status = efi_queue_work(GET_TIME, tm, tc, NULL, NULL, NULL);
dce48e35	246	up(&efi_runtime_lock);
022ee6c5 AB	247	return status;
	248	}
	249
	250	static efi_status_t virt_efi_set_time(efi_time_t *tm)
	251	{
022ee6c5 AB	252	efi_status_t status;
022ee6c5 AB	253
dce48e35 AB	254	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	255	return EFI_ABORTED;
3eb420e7	256	status = efi_queue_work(SET_TIME, tm, NULL, NULL, NULL, NULL);
dce48e35	257	up(&efi_runtime_lock);
022ee6c5 AB	258	return status;
	259	}
	260
	261	static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
	262	efi_bool_t *pending,
	263	efi_time_t *tm)
	264	{
022ee6c5 AB	265	efi_status_t status;
022ee6c5 AB	266
dce48e35 AB	267	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	268	return EFI_ABORTED;
3eb420e7 SP	269	status = efi_queue_work(GET_WAKEUP_TIME, enabled, pending, tm, NULL,
3eb420e7 SP	270	NULL);
dce48e35	271	up(&efi_runtime_lock);
022ee6c5 AB	272	return status;
	273	}
	274
	275	static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
	276	{
022ee6c5 AB	277	efi_status_t status;
022ee6c5 AB	278
dce48e35 AB	279	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	280	return EFI_ABORTED;
3eb420e7 SP	281	status = efi_queue_work(SET_WAKEUP_TIME, &enabled, tm, NULL, NULL,
3eb420e7 SP	282	NULL);
dce48e35	283	up(&efi_runtime_lock);
022ee6c5 AB	284	return status;
	285	}
	286
	287	static efi_status_t virt_efi_get_variable(efi_char16_t *name,
	288	efi_guid_t *vendor,
	289	u32 *attr,
	290	unsigned long *data_size,
	291	void *data)
	292	{
161485e8 AB	293	efi_status_t status;
161485e8 AB	294
dce48e35 AB	295	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	296	return EFI_ABORTED;
3eb420e7 SP	297	status = efi_queue_work(GET_VARIABLE, name, vendor, attr, data_size,
3eb420e7 SP	298	data);
dce48e35	299	up(&efi_runtime_lock);
161485e8	300	return status;
022ee6c5 AB	301	}
	302
	303	static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
	304	efi_char16_t *name,
	305	efi_guid_t *vendor)
	306	{
161485e8 AB	307	efi_status_t status;
161485e8 AB	308
dce48e35 AB	309	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	310	return EFI_ABORTED;
3eb420e7 SP	311	status = efi_queue_work(GET_NEXT_VARIABLE, name_size, name, vendor,
3eb420e7 SP	312	NULL, NULL);
dce48e35	313	up(&efi_runtime_lock);
161485e8	314	return status;
022ee6c5 AB	315	}
	316
	317	static efi_status_t virt_efi_set_variable(efi_char16_t *name,
	318	efi_guid_t *vendor,
	319	u32 attr,
	320	unsigned long data_size,
	321	void *data)
	322	{
161485e8	323	efi_status_t status;
161485e8	324
dce48e35 AB	325	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	326	return EFI_ABORTED;
3eb420e7 SP	327	status = efi_queue_work(SET_VARIABLE, name, vendor, &attr, &data_size,
3eb420e7 SP	328	data);
dce48e35	329	up(&efi_runtime_lock);
161485e8	330	return status;
022ee6c5 AB	331	}
022ee6c5 AB	332
6d80dba1 MF	333	static efi_status_t
	334	virt_efi_set_variable_nonblocking(efi_char16_t name, efi_guid_t vendor,
	335	u32 attr, unsigned long data_size,
	336	void *data)
	337	{
6d80dba1 MF	338	efi_status_t status;
6d80dba1 MF	339
dce48e35	340	if (down_trylock(&efi_runtime_lock))
6d80dba1 MF	341	return EFI_NOT_READY;
	342
	343	status = efi_call_virt(set_variable, name, vendor, attr, data_size,
	344	data);
dce48e35	345	up(&efi_runtime_lock);
6d80dba1 MF	346	return status;
	347	}
	348
	349
022ee6c5 AB	350	static efi_status_t virt_efi_query_variable_info(u32 attr,
	351	u64 *storage_space,
	352	u64 *remaining_space,
	353	u64 *max_variable_size)
	354	{
161485e8	355	efi_status_t status;
161485e8	356
022ee6c5 AB	357	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	358	return EFI_UNSUPPORTED;
	359
dce48e35 AB	360	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	361	return EFI_ABORTED;
3eb420e7 SP	362	status = efi_queue_work(QUERY_VARIABLE_INFO, &attr, storage_space,
3eb420e7 SP	363	remaining_space, max_variable_size, NULL);
dce48e35	364	up(&efi_runtime_lock);
161485e8	365	return status;
022ee6c5 AB	366	}
022ee6c5 AB	367
d3cac1f8 AB	368	static efi_status_t
	369	virt_efi_query_variable_info_nonblocking(u32 attr,
	370	u64 *storage_space,
	371	u64 *remaining_space,
	372	u64 *max_variable_size)
	373	{
d3cac1f8 AB	374	efi_status_t status;
	375
	376	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	377	return EFI_UNSUPPORTED;
	378
dce48e35	379	if (down_trylock(&efi_runtime_lock))
d3cac1f8 AB	380	return EFI_NOT_READY;
	381
	382	status = efi_call_virt(query_variable_info, attr, storage_space,
	383	remaining_space, max_variable_size);
dce48e35	384	up(&efi_runtime_lock);
d3cac1f8 AB	385	return status;
	386	}
	387
022ee6c5 AB	388	static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
022ee6c5 AB	389	{
161485e8 AB	390	efi_status_t status;
161485e8 AB	391
dce48e35 AB	392	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	393	return EFI_ABORTED;
3eb420e7 SP	394	status = efi_queue_work(GET_NEXT_HIGH_MONO_COUNT, count, NULL, NULL,
3eb420e7 SP	395	NULL, NULL);
dce48e35	396	up(&efi_runtime_lock);
161485e8	397	return status;
022ee6c5 AB	398	}
	399
	400	static void virt_efi_reset_system(int reset_type,
	401	efi_status_t status,
	402	unsigned long data_size,
	403	efi_char16_t *data)
	404	{
dce48e35 AB	405	if (down_interruptible(&efi_runtime_lock)) {
	406	pr_warn("failed to invoke the reset_system() runtime service:\n"
	407	"could not get exclusive access to the firmware\n");
	408	return;
	409	}
3425d934	410	efi_rts_work.efi_rts_id = RESET_SYSTEM;
022ee6c5	411	__efi_call_virt(reset_system, reset_type, status, data_size, data);
dce48e35	412	up(&efi_runtime_lock);
022ee6c5 AB	413	}
	414
	415	static efi_status_t virt_efi_update_capsule(efi_capsule_header_t **capsules,
	416	unsigned long count,
	417	unsigned long sg_list)
	418	{
161485e8 AB	419	efi_status_t status;
161485e8 AB	420
022ee6c5 AB	421	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	422	return EFI_UNSUPPORTED;
	423
dce48e35 AB	424	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	425	return EFI_ABORTED;
3eb420e7 SP	426	status = efi_queue_work(UPDATE_CAPSULE, capsules, &count, &sg_list,
3eb420e7 SP	427	NULL, NULL);
dce48e35	428	up(&efi_runtime_lock);
161485e8	429	return status;
022ee6c5 AB	430	}
	431
	432	static efi_status_t virt_efi_query_capsule_caps(efi_capsule_header_t **capsules,
	433	unsigned long count,
	434	u64 *max_size,
	435	int *reset_type)
	436	{
161485e8 AB	437	efi_status_t status;
161485e8 AB	438
022ee6c5 AB	439	if (efi.runtime_version < EFI_2_00_SYSTEM_TABLE_REVISION)
	440	return EFI_UNSUPPORTED;
	441
dce48e35 AB	442	if (down_interruptible(&efi_runtime_lock))
dce48e35 AB	443	return EFI_ABORTED;
3eb420e7 SP	444	status = efi_queue_work(QUERY_CAPSULE_CAPS, capsules, &count,
3eb420e7 SP	445	max_size, reset_type, NULL);
dce48e35	446	up(&efi_runtime_lock);
161485e8	447	return status;
022ee6c5 AB	448	}
	449
	450	void efi_native_runtime_setup(void)
	451	{
	452	efi.get_time = virt_efi_get_time;
	453	efi.set_time = virt_efi_set_time;
	454	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	455	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	456	efi.get_variable = virt_efi_get_variable;
	457	efi.get_next_variable = virt_efi_get_next_variable;
	458	efi.set_variable = virt_efi_set_variable;
6d80dba1	459	efi.set_variable_nonblocking = virt_efi_set_variable_nonblocking;
022ee6c5 AB	460	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	461	efi.reset_system = virt_efi_reset_system;
	462	efi.query_variable_info = virt_efi_query_variable_info;
d3cac1f8	463	efi.query_variable_info_nonblocking = virt_efi_query_variable_info_nonblocking;
022ee6c5 AB	464	efi.update_capsule = virt_efi_update_capsule;
	465	efi.query_capsule_caps = virt_efi_query_capsule_caps;
	466	}