drivers/acpi/acpica/rslist.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /*******************************************************************************
   3  *
   4  * Module Name: rslist - Linked list utilities
   5  *
   6  ******************************************************************************/
   7
   8 #include <acpi/acpi.h>
   9 #include "accommon.h"
  10 #include "acresrc.h"
  11
  12 #define _COMPONENT          ACPI_RESOURCES
  13 ACPI_MODULE_NAME("rslist")
  14
  15 /*******************************************************************************
  16  *
  17  * FUNCTION:    acpi_rs_convert_aml_to_resources
  18  *
  19  * PARAMETERS:  acpi_walk_aml_callback
  20  *              resource_ptr            - Pointer to the buffer that will
  21  *                                        contain the output structures
  22  *
  23  * RETURN:      Status
  24  *
  25  * DESCRIPTION: Convert an AML resource to an internal representation of the
  26  *              resource that is aligned and easier to access.
  27  *
  28  ******************************************************************************/
  29 acpi_status
  30 acpi_rs_convert_aml_to_resources(u8 * aml,
  31                                  u32 length,
  32                                  u32 offset, u8 resource_index, void **context)
  33 {
  34         struct acpi_resource **resource_ptr =
  35             ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);
  36         struct acpi_resource *resource;
  37         union aml_resource *aml_resource;
  38         struct acpi_rsconvert_info *conversion_table;
  39         acpi_status status;
  40
  41         ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);
  42
  43         /*
  44          * Check that the input buffer and all subsequent pointers into it
  45          * are aligned on a native word boundary. Most important on IA64
  46          */
  47         resource = *resource_ptr;
  48         if (ACPI_IS_MISALIGNED(resource)) {
  49                 ACPI_WARNING((AE_INFO,
  50                               "Misaligned resource pointer %p", resource));
  51         }
  52
  53         /* Get the appropriate conversion info table */
  54
  55         aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
  56
  57         if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) {
  58                 if (aml_resource->common_serial_bus.type >
  59                     AML_RESOURCE_MAX_SERIALBUSTYPE) {
  60                         conversion_table = NULL;
  61                 } else {
  62                         /* This is an I2C, SPI, or UART serial_bus descriptor */
  63
  64                         conversion_table =
  65                             acpi_gbl_convert_resource_serial_bus_dispatch
  66                             [aml_resource->common_serial_bus.type];
  67                 }
  68         } else {
  69                 conversion_table =
  70                     acpi_gbl_get_resource_dispatch[resource_index];
  71         }
  72
  73         if (!conversion_table) {
  74                 ACPI_ERROR((AE_INFO,
  75                             "Invalid/unsupported resource descriptor: Type 0x%2.2X",
  76                             resource_index));
  77                 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
  78         }
  79
  80         /* Convert the AML byte stream resource to a local resource struct */
  81
  82         status =
  83             acpi_rs_convert_aml_to_resource(resource, aml_resource,
  84                                             conversion_table);
  85         if (ACPI_FAILURE(status)) {
  86                 ACPI_EXCEPTION((AE_INFO, status,
  87                                 "Could not convert AML resource (Type 0x%X)",
  88                                 *aml));
  89                 return_ACPI_STATUS(status);
  90         }
  91
  92         ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,
  93                           "Type %.2X, AmlLength %.2X InternalLength %.2X\n",
  94                           acpi_ut_get_resource_type(aml), length,
  95                           resource->length));
  96
  97         /* Point to the next structure in the output buffer */
  98
  99         *resource_ptr = ACPI_NEXT_RESOURCE(resource);
 100         return_ACPI_STATUS(AE_OK);
 101 }
 102
 103 /*******************************************************************************
 104  *
 105  * FUNCTION:    acpi_rs_convert_resources_to_aml
 106  *
 107  * PARAMETERS:  resource            - Pointer to the resource linked list
 108  *              aml_size_needed     - Calculated size of the byte stream
 109  *                                    needed from calling acpi_rs_get_aml_length()
 110  *                                    The size of the output_buffer is
 111  *                                    guaranteed to be >= aml_size_needed
 112  *              output_buffer       - Pointer to the buffer that will
 113  *                                    contain the byte stream
 114  *
 115  * RETURN:      Status
 116  *
 117  * DESCRIPTION: Takes the resource linked list and parses it, creating a
 118  *              byte stream of resources in the caller's output buffer
 119  *
 120  ******************************************************************************/
 121
 122 acpi_status
 123 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,
 124                                  acpi_size aml_size_needed, u8 * output_buffer)
 125 {
 126         u8 *aml = output_buffer;
 127         u8 *end_aml = output_buffer + aml_size_needed;
 128         struct acpi_rsconvert_info *conversion_table;
 129         acpi_status status;
 130
 131         ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);
 132
 133         /* Walk the resource descriptor list, convert each descriptor */
 134
 135         while (aml < end_aml) {
 136
 137                 /* Validate the (internal) Resource Type */
 138
 139                 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {
 140                         ACPI_ERROR((AE_INFO,
 141                                     "Invalid descriptor type (0x%X) in resource list",
 142                                     resource->type));
 143                         return_ACPI_STATUS(AE_BAD_DATA);
 144                 }
 145
 146                 /* Sanity check the length. It must not be zero, or we loop forever */
 147
 148                 if (!resource->length) {
 149                         ACPI_ERROR((AE_INFO,
 150                                     "Invalid zero length descriptor in resource list\n"));
 151                         return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);
 152                 }
 153
 154                 /* Perform the conversion */
 155
 156                 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
 157                         if (resource->data.common_serial_bus.type >
 158                             AML_RESOURCE_MAX_SERIALBUSTYPE) {
 159                                 conversion_table = NULL;
 160                         } else {
 161                                 /* This is an I2C, SPI, or UART serial_bus descriptor */
 162
 163                                 conversion_table =
 164                                     acpi_gbl_convert_resource_serial_bus_dispatch
 165                                     [resource->data.common_serial_bus.type];
 166                         }
 167                 } else {
 168                         conversion_table =
 169                             acpi_gbl_set_resource_dispatch[resource->type];
 170                 }
 171
 172                 if (!conversion_table) {
 173                         ACPI_ERROR((AE_INFO,
 174                                     "Invalid/unsupported resource descriptor: Type 0x%2.2X",
 175                                     resource->type));
 176                         return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);
 177                 }
 178
 179                 status = acpi_rs_convert_resource_to_aml(resource,
 180                                                          ACPI_CAST_PTR(union
 181                                                                        aml_resource,
 182                                                                        aml),
 183                                                          conversion_table);
 184                 if (ACPI_FAILURE(status)) {
 185                         ACPI_EXCEPTION((AE_INFO, status,
 186                                         "Could not convert resource (type 0x%X) to AML",
 187                                         resource->type));
 188                         return_ACPI_STATUS(status);
 189                 }
 190
 191                 /* Perform final sanity check on the new AML resource descriptor */
 192
 193                 status =
 194                     acpi_ut_validate_resource(NULL,
 195                                               ACPI_CAST_PTR(union aml_resource,
 196                                                             aml), NULL);
 197                 if (ACPI_FAILURE(status)) {
 198                         return_ACPI_STATUS(status);
 199                 }
 200
 201                 /* Check for end-of-list, normal exit */
 202
 203                 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {
 204
 205                         /* An End Tag indicates the end of the input Resource Template */
 206
 207                         return_ACPI_STATUS(AE_OK);
 208                 }
 209
 210                 /*
 211                  * Extract the total length of the new descriptor and set the
 212                  * Aml to point to the next (output) resource descriptor
 213                  */
 214                 aml += acpi_ut_get_descriptor_length(aml);
 215
 216                 /* Point to the next input resource descriptor */
 217
 218                 resource = ACPI_NEXT_RESOURCE(resource);
 219         }
 220
 221         /* Completed buffer, but did not find an end_tag resource descriptor */
 222
 223         return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
 224 }