Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 590 insertions, 0 deletions

diff --git a/drivers/firmware/efi/runtime-wrappers.c b/drivers/firmware/efi/runtime-wrappers.c
new file mode 100644
index 0000000000..5d56bc40a7
--- /dev/null
+++ b/drivers/firmware/efi/runtime-wrappers.c
@@ -0,0 +1,590 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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
+ */
+
+#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...)   \
+	arch_efi_call_virt(efi.runtime, f, args)
+
+union efi_rts_args {
+	struct {
+		efi_time_t 	*time;
+		efi_time_cap_t	*capabilities;
+	} GET_TIME;
+
+	struct {
+		efi_time_t	*time;
+	} SET_TIME;
+
+	struct {
+		efi_bool_t	*enabled;
+		efi_bool_t	*pending;
+		efi_time_t	*time;
+	} GET_WAKEUP_TIME;
+
+	struct {
+		efi_bool_t	enable;
+		efi_time_t	*time;
+	} SET_WAKEUP_TIME;
+
+	struct {
+		efi_char16_t	*name;
+		efi_guid_t	*vendor;
+		u32		*attr;
+		unsigned long	*data_size;
+		void		*data;
+	} GET_VARIABLE;
+
+	struct {
+		unsigned long	*name_size;
+		efi_char16_t	*name;
+		efi_guid_t 	*vendor;
+	} GET_NEXT_VARIABLE;
+
+	struct {
+		efi_char16_t	*name;
+		efi_guid_t	*vendor;
+		u32		attr;
+		unsigned long	data_size;
+		void		*data;
+	} SET_VARIABLE;
+
+	struct {
+		u32		attr;
+		u64		*storage_space;
+		u64		*remaining_space;
+		u64		*max_variable_size;
+	} QUERY_VARIABLE_INFO;
+
+	struct {
+		u32		*high_count;
+	} GET_NEXT_HIGH_MONO_COUNT;
+
+	struct {
+		efi_capsule_header_t **capsules;
+		unsigned long	count;
+		unsigned long	sg_list;
+	} UPDATE_CAPSULE;
+
+	struct {
+		efi_capsule_header_t **capsules;
+		unsigned long	count;
+		u64		*max_size;
+		int		*reset_type;
+	} QUERY_CAPSULE_CAPS;
+
+	struct {
+		efi_status_t	(__efiapi *acpi_prm_handler)(u64, void *);
+		u64		param_buffer_addr;
+		void		*context;
+	} ACPI_PRM_HANDLER;
+};
+
+struct efi_runtime_work efi_rts_work;
+
+/*
+ * efi_queue_work:	Queue EFI runtime service call and wait for completion
+ * @_rts:		EFI runtime service function identifier
+ * @_args:		Arguments to pass to the EFI runtime service
+ *
+ * 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, _args...)					\
+	__efi_queue_work(EFI_ ## _rts,					\
+			 &(union efi_rts_args){ ._rts = { _args }})
+
+#ifndef arch_efi_save_flags
+#define arch_efi_save_flags(state_flags)	local_save_flags(state_flags)
+#define arch_efi_restore_flags(state_flags)	local_irq_restore(state_flags)
+#endif
+
+unsigned long efi_call_virt_save_flags(void)
+{
+	unsigned long flags;
+
+	arch_efi_save_flags(flags);
+	return flags;
+}
+
+void efi_call_virt_check_flags(unsigned long flags, const void *caller)
+{
+	unsigned long cur_flags, mismatch;
+
+	cur_flags = efi_call_virt_save_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 call from %pS\n",
+			   flags, cur_flags, caller ?: __builtin_return_address(0));
+	arch_efi_restore_flags(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, 1);
+
+/*
+ * 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.
+ */
+static void efi_call_rts(struct work_struct *work)
+{
+	const union efi_rts_args *args = efi_rts_work.args;
+	efi_status_t status = EFI_NOT_FOUND;
+	unsigned long flags;
+
+	arch_efi_call_virt_setup();
+	flags = efi_call_virt_save_flags();
+
+	switch (efi_rts_work.efi_rts_id) {
+	case EFI_GET_TIME:
+		status = efi_call_virt(get_time,
+				       args->GET_TIME.time,
+				       args->GET_TIME.capabilities);
+		break;
+	case EFI_SET_TIME:
+		status = efi_call_virt(set_time,
+				       args->SET_TIME.time);
+		break;
+	case EFI_GET_WAKEUP_TIME:
+		status = efi_call_virt(get_wakeup_time,
+				       args->GET_WAKEUP_TIME.enabled,
+				       args->GET_WAKEUP_TIME.pending,
+				       args->GET_WAKEUP_TIME.time);
+		break;
+	case EFI_SET_WAKEUP_TIME:
+		status = efi_call_virt(set_wakeup_time,
+				       args->SET_WAKEUP_TIME.enable,
+				       args->SET_WAKEUP_TIME.time);
+		break;
+	case EFI_GET_VARIABLE:
+		status = efi_call_virt(get_variable,
+				       args->GET_VARIABLE.name,
+				       args->GET_VARIABLE.vendor,
+				       args->GET_VARIABLE.attr,
+				       args->GET_VARIABLE.data_size,
+				       args->GET_VARIABLE.data);
+		break;
+	case EFI_GET_NEXT_VARIABLE:
+		status = efi_call_virt(get_next_variable,
+				       args->GET_NEXT_VARIABLE.name_size,
+				       args->GET_NEXT_VARIABLE.name,
+				       args->GET_NEXT_VARIABLE.vendor);
+		break;
+	case EFI_SET_VARIABLE:
+		status = efi_call_virt(set_variable,
+				       args->SET_VARIABLE.name,
+				       args->SET_VARIABLE.vendor,
+				       args->SET_VARIABLE.attr,
+				       args->SET_VARIABLE.data_size,
+				       args->SET_VARIABLE.data);
+		break;
+	case EFI_QUERY_VARIABLE_INFO:
+		status = efi_call_virt(query_variable_info,
+				       args->QUERY_VARIABLE_INFO.attr,
+				       args->QUERY_VARIABLE_INFO.storage_space,
+				       args->QUERY_VARIABLE_INFO.remaining_space,
+				       args->QUERY_VARIABLE_INFO.max_variable_size);
+		break;
+	case EFI_GET_NEXT_HIGH_MONO_COUNT:
+		status = efi_call_virt(get_next_high_mono_count,
+				       args->GET_NEXT_HIGH_MONO_COUNT.high_count);
+		break;
+	case EFI_UPDATE_CAPSULE:
+		status = efi_call_virt(update_capsule,
+				       args->UPDATE_CAPSULE.capsules,
+				       args->UPDATE_CAPSULE.count,
+				       args->UPDATE_CAPSULE.sg_list);
+		break;
+	case EFI_QUERY_CAPSULE_CAPS:
+		status = efi_call_virt(query_capsule_caps,
+				       args->QUERY_CAPSULE_CAPS.capsules,
+				       args->QUERY_CAPSULE_CAPS.count,
+				       args->QUERY_CAPSULE_CAPS.max_size,
+				       args->QUERY_CAPSULE_CAPS.reset_type);
+		break;
+	case EFI_ACPI_PRM_HANDLER:
+#ifdef CONFIG_ACPI_PRMT
+		status = arch_efi_call_virt(args, ACPI_PRM_HANDLER.acpi_prm_handler,
+					    args->ACPI_PRM_HANDLER.param_buffer_addr,
+					    args->ACPI_PRM_HANDLER.context);
+		break;
+#endif
+	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_call_virt_check_flags(flags, efi_rts_work.caller);
+	arch_efi_call_virt_teardown();
+
+	efi_rts_work.status = status;
+	complete(&efi_rts_work.efi_rts_comp);
+}
+
+static efi_status_t __efi_queue_work(enum efi_rts_ids id,
+				     union efi_rts_args *args)
+{
+	efi_rts_work.efi_rts_id = id;
+	efi_rts_work.args = args;
+	efi_rts_work.caller = __builtin_return_address(0);
+	efi_rts_work.status = EFI_ABORTED;
+
+	if (!efi_enabled(EFI_RUNTIME_SERVICES)) {
+		pr_warn_once("EFI Runtime Services are disabled!\n");
+		efi_rts_work.status = EFI_DEVICE_ERROR;
+		goto exit;
+	}
+
+	init_completion(&efi_rts_work.efi_rts_comp);
+	INIT_WORK(&efi_rts_work.work, efi_call_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");
+
+	WARN_ON_ONCE(efi_rts_work.status == EFI_ABORTED);
+exit:
+	efi_rts_work.efi_rts_id = EFI_NONE;
+	return efi_rts_work.status;
+}
+
+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);
+	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);
+	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);
+	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);
+	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);
+	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_nb(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_pointer(efi.runtime, 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);
+	up(&efi_runtime_lock);
+	return status;
+}
+
+static efi_status_t
+virt_efi_query_variable_info_nb(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_pointer(efi.runtime, 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);
+	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_trylock(&efi_runtime_lock)) {
+		pr_warn("failed to invoke the reset_system() runtime service:\n"
+			"could not get exclusive access to the firmware\n");
+		return;
+	}
+
+	arch_efi_call_virt_setup();
+	efi_rts_work.efi_rts_id = EFI_RESET_SYSTEM;
+	arch_efi_call_virt(efi.runtime, reset_system, reset_type, status,
+			   data_size, data);
+	arch_efi_call_virt_teardown();
+
+	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);
+	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);
+	up(&efi_runtime_lock);
+	return status;
+}
+
+void __init 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_nb;
+	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_nb;
+	efi.update_capsule		    = virt_efi_update_capsule;
+	efi.query_capsule_caps		    = virt_efi_query_capsule_caps;
+}
+
+#ifdef CONFIG_ACPI_PRMT
+
+efi_status_t
+efi_call_acpi_prm_handler(efi_status_t (__efiapi *handler_addr)(u64, void *),
+			  u64 param_buffer_addr, void *context)
+{
+	efi_status_t status;
+
+	if (down_interruptible(&efi_runtime_lock))
+		return EFI_ABORTED;
+	status = efi_queue_work(ACPI_PRM_HANDLER, handler_addr,
+				param_buffer_addr, context);
+	up(&efi_runtime_lock);
+	return status;
+}
+
+#endif