1/****************************************************************************** 2 * 3 * Module Name: evgpeutil - GPE utilities 4 * 5 *****************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2010, Intel Corp. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions, and the following disclaimer, 16 * without modification. 17 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 18 * substantially similar to the "NO WARRANTY" disclaimer below 19 * ("Disclaimer") and any redistribution must be conditioned upon 20 * including a substantially similar Disclaimer requirement for further 21 * binary redistribution. 22 * 3. Neither the names of the above-listed copyright holders nor the names 23 * of any contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * Alternatively, this software may be distributed under the terms of the 27 * GNU General Public License ("GPL") version 2 as published by the Free 28 * Software Foundation. 29 * 30 * NO WARRANTY 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 35 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 40 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 41 * POSSIBILITY OF SUCH DAMAGES. 42 */ 43 44#include <acpi/acpi.h> 45#include "accommon.h" 46#include "acevents.h" 47 48#define _COMPONENT ACPI_EVENTS 49ACPI_MODULE_NAME("evgpeutil") 50 51/******************************************************************************* 52 * 53 * FUNCTION: acpi_ev_walk_gpe_list 54 * 55 * PARAMETERS: gpe_walk_callback - Routine called for each GPE block 56 * Context - Value passed to callback 57 * 58 * RETURN: Status 59 * 60 * DESCRIPTION: Walk the GPE lists. 61 * 62 ******************************************************************************/ 63acpi_status 64acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context) 65{ 66 struct acpi_gpe_block_info *gpe_block; 67 struct acpi_gpe_xrupt_info *gpe_xrupt_info; 68 acpi_status status = AE_OK; 69 acpi_cpu_flags flags; 70 71 ACPI_FUNCTION_TRACE(ev_walk_gpe_list); 72 73 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 74 75 /* Walk the interrupt level descriptor list */ 76 77 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head; 78 while (gpe_xrupt_info) { 79 80 /* Walk all Gpe Blocks attached to this interrupt level */ 81 82 gpe_block = gpe_xrupt_info->gpe_block_list_head; 83 while (gpe_block) { 84 85 /* One callback per GPE block */ 86 87 status = 88 gpe_walk_callback(gpe_xrupt_info, gpe_block, 89 context); 90 if (ACPI_FAILURE(status)) { 91 if (status == AE_CTRL_END) { /* Callback abort */ 92 status = AE_OK; 93 } 94 goto unlock_and_exit; 95 } 96 97 gpe_block = gpe_block->next; 98 } 99 100 gpe_xrupt_info = gpe_xrupt_info->next; 101 } 102 103 unlock_and_exit: 104 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 105 return_ACPI_STATUS(status); 106} 107 108/******************************************************************************* 109 * 110 * FUNCTION: acpi_ev_valid_gpe_event 111 * 112 * PARAMETERS: gpe_event_info - Info for this GPE 113 * 114 * RETURN: TRUE if the gpe_event is valid 115 * 116 * DESCRIPTION: Validate a GPE event. DO NOT CALL FROM INTERRUPT LEVEL. 117 * Should be called only when the GPE lists are semaphore locked 118 * and not subject to change. 119 * 120 ******************************************************************************/ 121 122u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info) 123{ 124 struct acpi_gpe_xrupt_info *gpe_xrupt_block; 125 struct acpi_gpe_block_info *gpe_block; 126 127 ACPI_FUNCTION_ENTRY(); 128 129 /* No need for spin lock since we are not changing any list elements */ 130 131 /* Walk the GPE interrupt levels */ 132 133 gpe_xrupt_block = acpi_gbl_gpe_xrupt_list_head; 134 while (gpe_xrupt_block) { 135 gpe_block = gpe_xrupt_block->gpe_block_list_head; 136 137 /* Walk the GPE blocks on this interrupt level */ 138 139 while (gpe_block) { 140 if ((&gpe_block->event_info[0] <= gpe_event_info) && 141 (&gpe_block->event_info[gpe_block->gpe_count] > 142 gpe_event_info)) { 143 return (TRUE); 144 } 145 146 gpe_block = gpe_block->next; 147 } 148 149 gpe_xrupt_block = gpe_xrupt_block->next; 150 } 151 152 return (FALSE); 153} 154 155/******************************************************************************* 156 * 157 * FUNCTION: acpi_ev_get_gpe_xrupt_block 158 * 159 * PARAMETERS: interrupt_number - Interrupt for a GPE block 160 * 161 * RETURN: A GPE interrupt block 162 * 163 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt 164 * block per unique interrupt level used for GPEs. Should be 165 * called only when the GPE lists are semaphore locked and not 166 * subject to change. 167 * 168 ******************************************************************************/ 169 170struct acpi_gpe_xrupt_info *acpi_ev_get_gpe_xrupt_block(u32 interrupt_number) 171{ 172 struct acpi_gpe_xrupt_info *next_gpe_xrupt; 173 struct acpi_gpe_xrupt_info *gpe_xrupt; 174 acpi_status status; 175 acpi_cpu_flags flags; 176 177 ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block); 178 179 /* No need for lock since we are not changing any list elements here */ 180 181 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head; 182 while (next_gpe_xrupt) { 183 if (next_gpe_xrupt->interrupt_number == interrupt_number) { 184 return_PTR(next_gpe_xrupt); 185 } 186 187 next_gpe_xrupt = next_gpe_xrupt->next; 188 } 189 190 /* Not found, must allocate a new xrupt descriptor */ 191 192 gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info)); 193 if (!gpe_xrupt) { 194 return_PTR(NULL); 195 } 196 197 gpe_xrupt->interrupt_number = interrupt_number; 198 199 /* Install new interrupt descriptor with spin lock */ 200 201 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 202 if (acpi_gbl_gpe_xrupt_list_head) { 203 next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head; 204 while (next_gpe_xrupt->next) { 205 next_gpe_xrupt = next_gpe_xrupt->next; 206 } 207 208 next_gpe_xrupt->next = gpe_xrupt; 209 gpe_xrupt->previous = next_gpe_xrupt; 210 } else { 211 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt; 212 } 213 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 214 215 /* Install new interrupt handler if not SCI_INT */ 216 217 if (interrupt_number != acpi_gbl_FADT.sci_interrupt) { 218 status = acpi_os_install_interrupt_handler(interrupt_number, 219 acpi_ev_gpe_xrupt_handler, 220 gpe_xrupt); 221 if (ACPI_FAILURE(status)) { 222 ACPI_ERROR((AE_INFO, 223 "Could not install GPE interrupt handler at level 0x%X", 224 interrupt_number)); 225 return_PTR(NULL); 226 } 227 } 228 229 return_PTR(gpe_xrupt); 230} 231 232/******************************************************************************* 233 * 234 * FUNCTION: acpi_ev_delete_gpe_xrupt 235 * 236 * PARAMETERS: gpe_xrupt - A GPE interrupt info block 237 * 238 * RETURN: Status 239 * 240 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated 241 * interrupt handler if not the SCI interrupt. 242 * 243 ******************************************************************************/ 244 245acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt) 246{ 247 acpi_status status; 248 acpi_cpu_flags flags; 249 250 ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt); 251 252 /* We never want to remove the SCI interrupt handler */ 253 254 if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) { 255 gpe_xrupt->gpe_block_list_head = NULL; 256 return_ACPI_STATUS(AE_OK); 257 } 258 259 /* Disable this interrupt */ 260 261 status = 262 acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number, 263 acpi_ev_gpe_xrupt_handler); 264 if (ACPI_FAILURE(status)) { 265 return_ACPI_STATUS(status); 266 } 267 268 /* Unlink the interrupt block with lock */ 269 270 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock); 271 if (gpe_xrupt->previous) { 272 gpe_xrupt->previous->next = gpe_xrupt->next; 273 } else { 274 /* No previous, update list head */ 275 276 acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next; 277 } 278 279 if (gpe_xrupt->next) { 280 gpe_xrupt->next->previous = gpe_xrupt->previous; 281 } 282 acpi_os_release_lock(acpi_gbl_gpe_lock, flags); 283 284 /* Free the block */ 285 286 ACPI_FREE(gpe_xrupt); 287 return_ACPI_STATUS(AE_OK); 288} 289 290/******************************************************************************* 291 * 292 * FUNCTION: acpi_ev_delete_gpe_handlers 293 * 294 * PARAMETERS: gpe_xrupt_info - GPE Interrupt info 295 * gpe_block - Gpe Block info 296 * 297 * RETURN: Status 298 * 299 * DESCRIPTION: Delete all Handler objects found in the GPE data structs. 300 * Used only prior to termination. 301 * 302 ******************************************************************************/ 303 304acpi_status 305acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info, 306 struct acpi_gpe_block_info *gpe_block, 307 void *context) 308{ 309 struct acpi_gpe_event_info *gpe_event_info; 310 u32 i; 311 u32 j; 312 313 ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers); 314 315 /* Examine each GPE Register within the block */ 316 317 for (i = 0; i < gpe_block->register_count; i++) { 318 319 /* Now look at the individual GPEs in this byte register */ 320 321 for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { 322 gpe_event_info = &gpe_block->event_info[((acpi_size) i * 323 ACPI_GPE_REGISTER_WIDTH) 324 + j]; 325 326 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) == 327 ACPI_GPE_DISPATCH_HANDLER) { 328 ACPI_FREE(gpe_event_info->dispatch.handler); 329 gpe_event_info->dispatch.handler = NULL; 330 gpe_event_info->flags &= 331 ~ACPI_GPE_DISPATCH_MASK; 332 } 333 } 334 } 335 336 return_ACPI_STATUS(AE_OK); 337} 338