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304 lines
7.9 KiB
C
304 lines
7.9 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Author: Erik Kaneda <erik.kaneda@intel.com>
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* Copyright 2020 Intel Corporation
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*
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* prmt.c
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*
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* Each PRM service is an executable that is run in a restricted environment
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* that is invoked by writing to the PlatformRtMechanism OperationRegion from
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* AML bytecode.
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*
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* init_prmt initializes the Platform Runtime Mechanism (PRM) services by
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* processing data in the PRMT as well as registering an ACPI OperationRegion
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* handler for the PlatformRtMechanism subtype.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/efi.h>
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#include <linux/acpi.h>
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#include <linux/prmt.h>
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#include <asm/efi.h>
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#pragma pack(1)
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struct prm_mmio_addr_range {
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u64 phys_addr;
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u64 virt_addr;
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u32 length;
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};
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struct prm_mmio_info {
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u64 mmio_count;
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struct prm_mmio_addr_range addr_ranges[];
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};
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struct prm_buffer {
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u8 prm_status;
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u64 efi_status;
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u8 prm_cmd;
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guid_t handler_guid;
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};
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struct prm_context_buffer {
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char signature[ACPI_NAMESEG_SIZE];
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u16 revision;
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u16 reserved;
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guid_t identifier;
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u64 static_data_buffer;
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struct prm_mmio_info *mmio_ranges;
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};
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#pragma pack()
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LIST_HEAD(prm_module_list);
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struct prm_handler_info {
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guid_t guid;
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u64 handler_addr;
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u64 static_data_buffer_addr;
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u64 acpi_param_buffer_addr;
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struct list_head handler_list;
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};
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struct prm_module_info {
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guid_t guid;
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u16 major_rev;
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u16 minor_rev;
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u16 handler_count;
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struct prm_mmio_info *mmio_info;
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bool updatable;
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struct list_head module_list;
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struct prm_handler_info handlers[];
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};
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static u64 efi_pa_va_lookup(u64 pa)
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{
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efi_memory_desc_t *md;
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u64 pa_offset = pa & ~PAGE_MASK;
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u64 page = pa & PAGE_MASK;
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for_each_efi_memory_desc(md) {
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if (md->phys_addr < pa && pa < md->phys_addr + PAGE_SIZE * md->num_pages)
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return pa_offset + md->virt_addr + page - md->phys_addr;
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}
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return 0;
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}
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#define get_first_handler(a) ((struct acpi_prmt_handler_info *) ((char *) (a) + a->handler_info_offset))
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#define get_next_handler(a) ((struct acpi_prmt_handler_info *) (sizeof(struct acpi_prmt_handler_info) + (char *) a))
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static int __init
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acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end)
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{
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struct acpi_prmt_module_info *module_info;
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struct acpi_prmt_handler_info *handler_info;
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struct prm_handler_info *th;
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struct prm_module_info *tm;
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u64 mmio_count = 0;
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u64 cur_handler = 0;
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u32 module_info_size = 0;
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u64 mmio_range_size = 0;
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void *temp_mmio;
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module_info = (struct acpi_prmt_module_info *) header;
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module_info_size = struct_size(tm, handlers, module_info->handler_info_count);
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tm = kmalloc(module_info_size, GFP_KERNEL);
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guid_copy(&tm->guid, (guid_t *) module_info->module_guid);
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tm->major_rev = module_info->major_rev;
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tm->minor_rev = module_info->minor_rev;
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tm->handler_count = module_info->handler_info_count;
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tm->updatable = true;
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if (module_info->mmio_list_pointer) {
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/*
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* Each module is associated with a list of addr
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* ranges that it can use during the service
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*/
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mmio_count = *(u64 *) memremap(module_info->mmio_list_pointer, 8, MEMREMAP_WB);
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mmio_range_size = struct_size(tm->mmio_info, addr_ranges, mmio_count);
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tm->mmio_info = kmalloc(mmio_range_size, GFP_KERNEL);
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temp_mmio = memremap(module_info->mmio_list_pointer, mmio_range_size, MEMREMAP_WB);
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memmove(tm->mmio_info, temp_mmio, mmio_range_size);
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} else {
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mmio_range_size = struct_size(tm->mmio_info, addr_ranges, mmio_count);
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tm->mmio_info = kmalloc(mmio_range_size, GFP_KERNEL);
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tm->mmio_info->mmio_count = 0;
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}
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INIT_LIST_HEAD(&tm->module_list);
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list_add(&tm->module_list, &prm_module_list);
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handler_info = get_first_handler(module_info);
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do {
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th = &tm->handlers[cur_handler];
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guid_copy(&th->guid, (guid_t *)handler_info->handler_guid);
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th->handler_addr = efi_pa_va_lookup(handler_info->handler_address);
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th->static_data_buffer_addr = efi_pa_va_lookup(handler_info->static_data_buffer_address);
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th->acpi_param_buffer_addr = efi_pa_va_lookup(handler_info->acpi_param_buffer_address);
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} while (++cur_handler < tm->handler_count && (handler_info = get_next_handler(handler_info)));
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return 0;
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}
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#define GET_MODULE 0
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#define GET_HANDLER 1
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static void *find_guid_info(const guid_t *guid, u8 mode)
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{
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struct prm_handler_info *cur_handler;
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struct prm_module_info *cur_module;
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int i = 0;
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list_for_each_entry(cur_module, &prm_module_list, module_list) {
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for (i = 0; i < cur_module->handler_count; ++i) {
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cur_handler = &cur_module->handlers[i];
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if (guid_equal(guid, &cur_handler->guid)) {
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if (mode == GET_MODULE)
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return (void *)cur_module;
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else
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return (void *)cur_handler;
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}
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}
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}
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return NULL;
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}
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static struct prm_module_info *find_prm_module(const guid_t *guid)
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{
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return (struct prm_module_info *)find_guid_info(guid, GET_MODULE);
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}
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static struct prm_handler_info *find_prm_handler(const guid_t *guid)
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{
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return (struct prm_handler_info *) find_guid_info(guid, GET_HANDLER);
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}
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/* In-coming PRM commands */
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#define PRM_CMD_RUN_SERVICE 0
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#define PRM_CMD_START_TRANSACTION 1
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#define PRM_CMD_END_TRANSACTION 2
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/* statuses that can be passed back to ASL */
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#define PRM_HANDLER_SUCCESS 0
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#define PRM_HANDLER_ERROR 1
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#define INVALID_PRM_COMMAND 2
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#define PRM_HANDLER_GUID_NOT_FOUND 3
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#define UPDATE_LOCK_ALREADY_HELD 4
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#define UPDATE_UNLOCK_WITHOUT_LOCK 5
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/*
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* This is the PlatformRtMechanism opregion space handler.
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* @function: indicates the read/write. In fact as the PlatformRtMechanism
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* message is driven by command, only write is meaningful.
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*
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* @addr : not used
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* @bits : not used.
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* @value : it is an in/out parameter. It points to the PRM message buffer.
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* @handler_context: not used
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*/
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static acpi_status acpi_platformrt_space_handler(u32 function,
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acpi_physical_address addr,
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u32 bits, acpi_integer *value,
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void *handler_context,
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void *region_context)
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{
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struct prm_buffer *buffer = ACPI_CAST_PTR(struct prm_buffer, value);
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struct prm_handler_info *handler;
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struct prm_module_info *module;
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efi_status_t status;
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struct prm_context_buffer context;
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/*
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* The returned acpi_status will always be AE_OK. Error values will be
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* saved in the first byte of the PRM message buffer to be used by ASL.
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*/
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switch (buffer->prm_cmd) {
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case PRM_CMD_RUN_SERVICE:
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handler = find_prm_handler(&buffer->handler_guid);
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module = find_prm_module(&buffer->handler_guid);
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if (!handler || !module)
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goto invalid_guid;
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ACPI_COPY_NAMESEG(context.signature, "PRMC");
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context.revision = 0x0;
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context.reserved = 0x0;
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context.identifier = handler->guid;
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context.static_data_buffer = handler->static_data_buffer_addr;
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context.mmio_ranges = module->mmio_info;
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status = efi_call_virt_pointer(handler, handler_addr,
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handler->acpi_param_buffer_addr,
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&context);
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if (status == EFI_SUCCESS) {
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buffer->prm_status = PRM_HANDLER_SUCCESS;
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} else {
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buffer->prm_status = PRM_HANDLER_ERROR;
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buffer->efi_status = status;
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}
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break;
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case PRM_CMD_START_TRANSACTION:
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module = find_prm_module(&buffer->handler_guid);
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if (!module)
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goto invalid_guid;
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if (module->updatable)
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module->updatable = false;
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else
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buffer->prm_status = UPDATE_LOCK_ALREADY_HELD;
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break;
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case PRM_CMD_END_TRANSACTION:
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module = find_prm_module(&buffer->handler_guid);
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if (!module)
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goto invalid_guid;
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if (module->updatable)
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buffer->prm_status = UPDATE_UNLOCK_WITHOUT_LOCK;
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else
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module->updatable = true;
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break;
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default:
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buffer->prm_status = INVALID_PRM_COMMAND;
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break;
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}
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return AE_OK;
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invalid_guid:
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buffer->prm_status = PRM_HANDLER_GUID_NOT_FOUND;
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return AE_OK;
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}
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void __init init_prmt(void)
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{
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acpi_status status;
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int mc = acpi_table_parse_entries(ACPI_SIG_PRMT, sizeof(struct acpi_table_prmt) +
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sizeof (struct acpi_table_prmt_header),
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0, acpi_parse_prmt, 0);
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pr_info("PRM: found %u modules\n", mc);
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status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
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ACPI_ADR_SPACE_PLATFORM_RT,
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&acpi_platformrt_space_handler,
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NULL, NULL);
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if (ACPI_FAILURE(status))
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pr_alert("PRM: OperationRegion handler could not be installed\n");
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}
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