diff options
Diffstat (limited to 'drivers/acpi/acpica/rscreate.c')
| -rw-r--r-- | drivers/acpi/acpica/rscreate.c | 448 |
1 files changed, 448 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/rscreate.c b/drivers/acpi/acpica/rscreate.c new file mode 100644 index 000000000..c659b5498 --- /dev/null +++ b/drivers/acpi/acpica/rscreate.c @@ -0,0 +1,448 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/******************************************************************************* + * + * Module Name: rscreate - Create resource lists/tables + * + ******************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "acresrc.h" +#include "acnamesp.h" + +#define _COMPONENT ACPI_RESOURCES +ACPI_MODULE_NAME("rscreate") + +/******************************************************************************* + * + * FUNCTION: acpi_buffer_to_resource + * + * PARAMETERS: aml_buffer - Pointer to the resource byte stream + * aml_buffer_length - Length of the aml_buffer + * resource_ptr - Where the converted resource is returned + * + * RETURN: Status + * + * DESCRIPTION: Convert a raw AML buffer to a resource list + * + ******************************************************************************/ +acpi_status +acpi_buffer_to_resource(u8 *aml_buffer, + u16 aml_buffer_length, + struct acpi_resource **resource_ptr) +{ + acpi_status status; + acpi_size list_size_needed; + void *resource; + void *current_resource_ptr; + + ACPI_FUNCTION_TRACE(acpi_buffer_to_resource); + + /* + * Note: we allow AE_AML_NO_RESOURCE_END_TAG, since an end tag + * is not required here. + */ + + /* Get the required length for the converted resource */ + + status = + acpi_rs_get_list_length(aml_buffer, aml_buffer_length, + &list_size_needed); + if (status == AE_AML_NO_RESOURCE_END_TAG) { + status = AE_OK; + } + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Allocate a buffer for the converted resource */ + + resource = ACPI_ALLOCATE_ZEROED(list_size_needed); + current_resource_ptr = resource; + if (!resource) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Perform the AML-to-Resource conversion */ + + status = acpi_ut_walk_aml_resources(NULL, aml_buffer, aml_buffer_length, + acpi_rs_convert_aml_to_resources, + ¤t_resource_ptr); + if (status == AE_AML_NO_RESOURCE_END_TAG) { + status = AE_OK; + } + if (ACPI_FAILURE(status)) { + ACPI_FREE(resource); + } else { + *resource_ptr = resource; + } + + return_ACPI_STATUS(status); +} + +ACPI_EXPORT_SYMBOL(acpi_buffer_to_resource) + +/******************************************************************************* + * + * FUNCTION: acpi_rs_create_resource_list + * + * PARAMETERS: aml_buffer - Pointer to the resource byte stream + * output_buffer - Pointer to the user's buffer + * + * RETURN: Status: AE_OK if okay, else a valid acpi_status code + * If output_buffer is not large enough, output_buffer_length + * indicates how large output_buffer should be, else it + * indicates how may u8 elements of output_buffer are valid. + * + * DESCRIPTION: Takes the byte stream returned from a _CRS, _PRS control method + * execution and parses the stream to create a linked list + * of device resources. + * + ******************************************************************************/ +acpi_status +acpi_rs_create_resource_list(union acpi_operand_object *aml_buffer, + struct acpi_buffer *output_buffer) +{ + + acpi_status status; + u8 *aml_start; + acpi_size list_size_needed = 0; + u32 aml_buffer_length; + void *resource; + + ACPI_FUNCTION_TRACE(rs_create_resource_list); + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlBuffer = %p\n", aml_buffer)); + + /* Params already validated, so we don't re-validate here */ + + aml_buffer_length = aml_buffer->buffer.length; + aml_start = aml_buffer->buffer.pointer; + + /* + * Pass the aml_buffer into a module that can calculate + * the buffer size needed for the linked list + */ + status = acpi_rs_get_list_length(aml_start, aml_buffer_length, + &list_size_needed); + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Status=%X ListSizeNeeded=%X\n", + status, (u32) list_size_needed)); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Validate/Allocate/Clear caller buffer */ + + status = acpi_ut_initialize_buffer(output_buffer, list_size_needed); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Do the conversion */ + + resource = output_buffer->pointer; + status = acpi_ut_walk_aml_resources(NULL, aml_start, aml_buffer_length, + acpi_rs_convert_aml_to_resources, + &resource); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n", + output_buffer->pointer, (u32) output_buffer->length)); + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_rs_create_pci_routing_table + * + * PARAMETERS: package_object - Pointer to a package containing one + * of more ACPI_OPERAND_OBJECTs + * output_buffer - Pointer to the user's buffer + * + * RETURN: Status AE_OK if okay, else a valid acpi_status code. + * If the output_buffer is too small, the error will be + * AE_BUFFER_OVERFLOW and output_buffer->Length will point + * to the size buffer needed. + * + * DESCRIPTION: Takes the union acpi_operand_object package and creates a + * linked list of PCI interrupt descriptions + * + * NOTE: It is the caller's responsibility to ensure that the start of the + * output buffer is aligned properly (if necessary). + * + ******************************************************************************/ + +acpi_status +acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object, + struct acpi_buffer *output_buffer) +{ + u8 *buffer; + union acpi_operand_object **top_object_list; + union acpi_operand_object **sub_object_list; + union acpi_operand_object *obj_desc; + acpi_size buffer_size_needed = 0; + u32 number_of_elements; + u32 index; + struct acpi_pci_routing_table *user_prt; + struct acpi_namespace_node *node; + acpi_status status; + struct acpi_buffer path_buffer; + + ACPI_FUNCTION_TRACE(rs_create_pci_routing_table); + + /* Params already validated, so we don't re-validate here */ + + /* Get the required buffer length */ + + status = + acpi_rs_get_pci_routing_table_length(package_object, + &buffer_size_needed); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "BufferSizeNeeded = %X\n", + (u32) buffer_size_needed)); + + /* Validate/Allocate/Clear caller buffer */ + + status = acpi_ut_initialize_buffer(output_buffer, buffer_size_needed); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* + * Loop through the ACPI_INTERNAL_OBJECTS - Each object should be a + * package that in turn contains an u64 Address, a u8 Pin, + * a Name, and a u8 source_index. + */ + top_object_list = package_object->package.elements; + number_of_elements = package_object->package.count; + buffer = output_buffer->pointer; + user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer); + + for (index = 0; index < number_of_elements; index++) { + + /* + * Point user_prt past this current structure + * + * NOTE: On the first iteration, user_prt->Length will + * be zero because we cleared the return buffer earlier + */ + buffer += user_prt->length; + user_prt = ACPI_CAST_PTR(struct acpi_pci_routing_table, buffer); + + /* + * Fill in the Length field with the information we have at this + * point. The minus four is to subtract the size of the u8 + * Source[4] member because it is added below. + */ + user_prt->length = (sizeof(struct acpi_pci_routing_table) - 4); + + /* Each subpackage must be of length 4 */ + + if ((*top_object_list)->package.count != 4) { + ACPI_ERROR((AE_INFO, + "(PRT[%u]) Need package of length 4, found length %u", + index, (*top_object_list)->package.count)); + return_ACPI_STATUS(AE_AML_PACKAGE_LIMIT); + } + + /* + * Dereference the subpackage. + * The sub_object_list will now point to an array of the four IRQ + * elements: [Address, Pin, Source, source_index] + */ + sub_object_list = (*top_object_list)->package.elements; + + /* 1) First subobject: Dereference the PRT.Address */ + + obj_desc = sub_object_list[0]; + if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, + "(PRT[%u].Address) Need Integer, found %s", + index, + acpi_ut_get_object_type_name(obj_desc))); + return_ACPI_STATUS(AE_BAD_DATA); + } + + user_prt->address = obj_desc->integer.value; + + /* 2) Second subobject: Dereference the PRT.Pin */ + + obj_desc = sub_object_list[1]; + if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, + "(PRT[%u].Pin) Need Integer, found %s", + index, + acpi_ut_get_object_type_name(obj_desc))); + return_ACPI_STATUS(AE_BAD_DATA); + } + + user_prt->pin = (u32) obj_desc->integer.value; + + /* + * 3) Third subobject: Dereference the PRT.source_name + * The name may be unresolved (slack mode), so allow a null object + */ + obj_desc = sub_object_list[2]; + if (obj_desc) { + switch (obj_desc->common.type) { + case ACPI_TYPE_LOCAL_REFERENCE: + + if (obj_desc->reference.class != + ACPI_REFCLASS_NAME) { + ACPI_ERROR((AE_INFO, + "(PRT[%u].Source) Need name, found Reference Class 0x%X", + index, + obj_desc->reference.class)); + return_ACPI_STATUS(AE_BAD_DATA); + } + + node = obj_desc->reference.node; + + /* Use *remaining* length of the buffer as max for pathname */ + + path_buffer.length = output_buffer->length - + (u32) ((u8 *) user_prt->source - + (u8 *) output_buffer->pointer); + path_buffer.pointer = user_prt->source; + + status = acpi_ns_handle_to_pathname((acpi_handle)node, &path_buffer, FALSE); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* +1 to include null terminator */ + + user_prt->length += + (u32)strlen(user_prt->source) + 1; + break; + + case ACPI_TYPE_STRING: + + strcpy(user_prt->source, + obj_desc->string.pointer); + + /* + * Add to the Length field the length of the string + * (add 1 for terminator) + */ + user_prt->length += obj_desc->string.length + 1; + break; + + case ACPI_TYPE_INTEGER: + /* + * If this is a number, then the Source Name is NULL, since + * the entire buffer was zeroed out, we can leave this alone. + * + * Add to the Length field the length of the u32 NULL + */ + user_prt->length += sizeof(u32); + break; + + default: + + ACPI_ERROR((AE_INFO, + "(PRT[%u].Source) Need Ref/String/Integer, found %s", + index, + acpi_ut_get_object_type_name + (obj_desc))); + return_ACPI_STATUS(AE_BAD_DATA); + } + } + + /* Now align the current length */ + + user_prt->length = + (u32) ACPI_ROUND_UP_TO_64BIT(user_prt->length); + + /* 4) Fourth subobject: Dereference the PRT.source_index */ + + obj_desc = sub_object_list[3]; + if (!obj_desc || obj_desc->common.type != ACPI_TYPE_INTEGER) { + ACPI_ERROR((AE_INFO, + "(PRT[%u].SourceIndex) Need Integer, found %s", + index, + acpi_ut_get_object_type_name(obj_desc))); + return_ACPI_STATUS(AE_BAD_DATA); + } + + user_prt->source_index = (u32) obj_desc->integer.value; + + /* Point to the next union acpi_operand_object in the top level package */ + + top_object_list++; + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n", + output_buffer->pointer, (u32) output_buffer->length)); + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_rs_create_aml_resources + * + * PARAMETERS: resource_list - Pointer to the resource list buffer + * output_buffer - Where the AML buffer is returned + * + * RETURN: Status AE_OK if okay, else a valid acpi_status code. + * If the output_buffer is too small, the error will be + * AE_BUFFER_OVERFLOW and output_buffer->Length will point + * to the size buffer needed. + * + * DESCRIPTION: Converts a list of device resources to an AML bytestream + * to be used as input for the _SRS control method. + * + ******************************************************************************/ + +acpi_status +acpi_rs_create_aml_resources(struct acpi_buffer *resource_list, + struct acpi_buffer *output_buffer) +{ + acpi_status status; + acpi_size aml_size_needed = 0; + + ACPI_FUNCTION_TRACE(rs_create_aml_resources); + + /* Params already validated, no need to re-validate here */ + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "ResourceList Buffer = %p\n", + resource_list->pointer)); + + /* Get the buffer size needed for the AML byte stream */ + + status = + acpi_rs_get_aml_length(resource_list->pointer, + resource_list->length, &aml_size_needed); + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "AmlSizeNeeded=%X, %s\n", + (u32)aml_size_needed, acpi_format_exception(status))); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Validate/Allocate/Clear caller buffer */ + + status = acpi_ut_initialize_buffer(output_buffer, aml_size_needed); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + /* Do the conversion */ + + status = acpi_rs_convert_resources_to_aml(resource_list->pointer, + aml_size_needed, + output_buffer->pointer); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "OutputBuffer %p Length %X\n", + output_buffer->pointer, (u32) output_buffer->length)); + return_ACPI_STATUS(AE_OK); +} |