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path: root/drivers/acpi/acpica/evgpeblk.c
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Diffstat (limited to 'drivers/acpi/acpica/evgpeblk.c')
-rw-r--r--drivers/acpi/acpica/evgpeblk.c143
1 files changed, 76 insertions, 67 deletions
diff --git a/drivers/acpi/acpica/evgpeblk.c b/drivers/acpi/acpica/evgpeblk.c
index fa47e3522abe..85ded1f2540d 100644
--- a/drivers/acpi/acpica/evgpeblk.c
+++ b/drivers/acpi/acpica/evgpeblk.c
@@ -51,7 +51,7 @@ ACPI_MODULE_NAME("evgpeblk")
/* Local prototypes */
static acpi_status
-acpi_ev_save_method_info(acpi_handle obj_handle,
+acpi_ev_match_gpe_method(acpi_handle obj_handle,
u32 level, void *obj_desc, void **return_value);
static acpi_status
@@ -104,9 +104,7 @@ u8 acpi_ev_valid_gpe_event(struct acpi_gpe_event_info *gpe_event_info)
while (gpe_block) {
if ((&gpe_block->event_info[0] <= gpe_event_info) &&
- (&gpe_block->event_info[((acpi_size)
- gpe_block->
- register_count) * 8] >
+ (&gpe_block->event_info[gpe_block->gpe_count] >
gpe_event_info)) {
return (TRUE);
}
@@ -229,7 +227,7 @@ acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
/*******************************************************************************
*
- * FUNCTION: acpi_ev_save_method_info
+ * FUNCTION: acpi_ev_match_gpe_method
*
* PARAMETERS: Callback from walk_namespace
*
@@ -241,8 +239,7 @@ acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
* information for quick lookup during GPE dispatch
*
* The name of each GPE control method is of the form:
- * "_Lxx" or "_Exx"
- * Where:
+ * "_Lxx" or "_Exx", where:
* L - means that the GPE is level triggered
* E - means that the GPE is edge triggered
* xx - is the GPE number [in HEX]
@@ -250,9 +247,11 @@ acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
******************************************************************************/
static acpi_status
-acpi_ev_save_method_info(acpi_handle obj_handle,
+acpi_ev_match_gpe_method(acpi_handle obj_handle,
u32 level, void *obj_desc, void **return_value)
{
+ struct acpi_namespace_node *method_node =
+ ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
struct acpi_gpe_block_info *gpe_block = (void *)obj_desc;
struct acpi_gpe_event_info *gpe_event_info;
u32 gpe_number;
@@ -262,21 +261,25 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
ACPI_FUNCTION_TRACE(ev_save_method_info);
/*
- * _Lxx and _Exx GPE method support
+ * Match and decode the _Lxx and _Exx GPE method names
*
- * 1) Extract the name from the object and convert to a string
+ * 1) Extract the method name and null terminate it
*/
- ACPI_MOVE_32_TO_32(name,
- &((struct acpi_namespace_node *)obj_handle)->name.
- integer);
+ ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
name[ACPI_NAME_SIZE] = 0;
+ /* 2) Name must begin with an underscore */
+
+ if (name[0] != '_') {
+ return_ACPI_STATUS(AE_OK); /* Ignore this method */
+ }
+
/*
- * 2) Edge/Level determination is based on the 2nd character
+ * 3) Edge/Level determination is based on the 2nd character
* of the method name
*
- * NOTE: Default GPE type is RUNTIME. May be changed later to WAKE
- * if a _PRW object is found that points to this GPE.
+ * NOTE: Default GPE type is RUNTIME only. Later, if a _PRW object is
+ * found that points to this GPE, the ACPI_GPE_CAN_WAKE flag is set.
*/
switch (name[1]) {
case 'L':
@@ -288,7 +291,7 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
break;
default:
- /* Unknown method type, just ignore it! */
+ /* Unknown method type, just ignore it */
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
"Ignoring unknown GPE method type: %s "
@@ -296,7 +299,7 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
return_ACPI_STATUS(AE_OK);
}
- /* Convert the last two characters of the name to the GPE Number */
+ /* 4) The last two characters of the name are the hex GPE Number */
gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
if (gpe_number == ACPI_UINT32_MAX) {
@@ -311,28 +314,22 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
/* Ensure that we have a valid GPE number for this GPE block */
- if ((gpe_number < gpe_block->block_base_number) ||
- (gpe_number >= (gpe_block->block_base_number +
- (gpe_block->register_count * 8)))) {
+ gpe_event_info = acpi_ev_low_get_gpe_info(gpe_number, gpe_block);
+ if (!gpe_event_info) {
/*
- * Not valid for this GPE block, just ignore it. However, it may be
- * valid for a different GPE block, since GPE0 and GPE1 methods both
- * appear under \_GPE.
+ * This gpe_number is not valid for this GPE block, just ignore it.
+ * However, it may be valid for a different GPE block, since GPE0
+ * and GPE1 methods both appear under \_GPE.
*/
return_ACPI_STATUS(AE_OK);
}
/*
- * Now we can add this information to the gpe_event_info block for use
- * during dispatch of this GPE.
+ * Add the GPE information from above to the gpe_event_info block for
+ * use during dispatch of this GPE.
*/
- gpe_event_info =
- &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
-
- gpe_event_info->flags = (u8) (type | ACPI_GPE_DISPATCH_METHOD);
-
- gpe_event_info->dispatch.method_node =
- (struct acpi_namespace_node *)obj_handle;
+ gpe_event_info->flags = (u8)(type | ACPI_GPE_DISPATCH_METHOD);
+ gpe_event_info->dispatch.method_node = method_node;
ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
"Registered GPE method %s as GPE number 0x%.2X\n",
@@ -351,7 +348,7 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
*
* DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
* Device. Run the _PRW method. If present, extract the GPE
- * number and mark the GPE as a WAKE GPE.
+ * number and mark the GPE as a CAN_WAKE GPE.
*
******************************************************************************/
@@ -377,7 +374,7 @@ acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
ACPI_BTYPE_PACKAGE, &pkg_desc);
if (ACPI_FAILURE(status)) {
- /* Ignore all errors from _PRW, we don't want to abort the subsystem */
+ /* Ignore all errors from _PRW, we don't want to abort the walk */
return_ACPI_STATUS(AE_OK);
}
@@ -439,13 +436,13 @@ acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
* 2) The GPE index(number) is within the range of the Gpe Block
* associated with the GPE device.
*/
- if ((gpe_device == target_gpe_device) &&
- (gpe_number >= gpe_block->block_base_number) &&
- (gpe_number < gpe_block->block_base_number +
- (gpe_block->register_count * 8))) {
- gpe_event_info = &gpe_block->event_info[gpe_number -
- gpe_block->
- block_base_number];
+ if (gpe_device != target_gpe_device) {
+ goto cleanup;
+ }
+
+ gpe_event_info = acpi_ev_low_get_gpe_info(gpe_number, gpe_block);
+ if (gpe_event_info) {
+ /* This GPE can wake the system */
gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
}
@@ -705,8 +702,7 @@ acpi_status acpi_ev_delete_gpe_block(struct acpi_gpe_block_info *gpe_block)
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
}
- acpi_current_gpe_count -=
- gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH;
+ acpi_current_gpe_count -= gpe_block->gpe_count;
/* Free the gpe_block */
@@ -760,9 +756,7 @@ acpi_ev_create_gpe_info_blocks(struct acpi_gpe_block_info *gpe_block)
* Allocate the GPE event_info block. There are eight distinct GPEs
* per register. Initialization to zeros is sufficient.
*/
- gpe_event_info = ACPI_ALLOCATE_ZEROED(((acpi_size) gpe_block->
- register_count *
- ACPI_GPE_REGISTER_WIDTH) *
+ gpe_event_info = ACPI_ALLOCATE_ZEROED((acpi_size) gpe_block->gpe_count *
sizeof(struct
acpi_gpe_event_info));
if (!gpe_event_info) {
@@ -897,6 +891,7 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
/* Initialize the new GPE block */
gpe_block->node = gpe_device;
+ gpe_block->gpe_count = (u16)(register_count * ACPI_GPE_REGISTER_WIDTH);
gpe_block->register_count = register_count;
gpe_block->block_base_number = gpe_block_base_number;
@@ -925,7 +920,7 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD, gpe_device,
ACPI_UINT32_MAX, ACPI_NS_WALK_NO_UNLOCK,
- acpi_ev_save_method_info, NULL,
+ acpi_ev_match_gpe_method, NULL,
gpe_block, NULL);
/* Return the new block */
@@ -938,14 +933,13 @@ acpi_ev_create_gpe_block(struct acpi_namespace_node *gpe_device,
"GPE %02X to %02X [%4.4s] %u regs on int 0x%X\n",
(u32) gpe_block->block_base_number,
(u32) (gpe_block->block_base_number +
- ((gpe_block->register_count *
- ACPI_GPE_REGISTER_WIDTH) - 1)),
+ (gpe_block->gpe_count - 1)),
gpe_device->name.ascii, gpe_block->register_count,
interrupt_number));
/* Update global count of currently available GPEs */
- acpi_current_gpe_count += register_count * ACPI_GPE_REGISTER_WIDTH;
+ acpi_current_gpe_count += gpe_block->gpe_count;
return_ACPI_STATUS(AE_OK);
}
@@ -969,10 +963,13 @@ acpi_status
acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
struct acpi_gpe_block_info *gpe_block)
{
+ acpi_status status;
struct acpi_gpe_event_info *gpe_event_info;
struct acpi_gpe_walk_info gpe_info;
u32 wake_gpe_count;
u32 gpe_enabled_count;
+ u32 gpe_index;
+ u32 gpe_number;
u32 i;
u32 j;
@@ -998,50 +995,62 @@ acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
gpe_info.gpe_block = gpe_block;
gpe_info.gpe_device = gpe_device;
- acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+ status = acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
acpi_ev_match_prw_and_gpe, NULL,
&gpe_info, NULL);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "While executing _PRW methods"));
+ }
}
/*
- * Enable all GPEs that have a corresponding method and aren't
+ * Enable all GPEs that have a corresponding method and are not
* capable of generating wakeups. Any other GPEs within this block
- * must be enabled via the acpi_enable_gpe() interface.
+ * must be enabled via the acpi_enable_gpe interface.
*/
wake_gpe_count = 0;
gpe_enabled_count = 0;
- if (gpe_device == acpi_gbl_fadt_gpe_device)
+
+ if (gpe_device == acpi_gbl_fadt_gpe_device) {
gpe_device = NULL;
+ }
for (i = 0; i < gpe_block->register_count; i++) {
for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
- acpi_status status;
- acpi_size gpe_index;
- int gpe_number;
/* Get the info block for this particular GPE */
- gpe_index = (acpi_size)i * ACPI_GPE_REGISTER_WIDTH + j;
+
+ gpe_index = (i * ACPI_GPE_REGISTER_WIDTH) + j;
gpe_event_info = &gpe_block->event_info[gpe_index];
if (gpe_event_info->flags & ACPI_GPE_CAN_WAKE) {
wake_gpe_count++;
- if (acpi_gbl_leave_wake_gpes_disabled)
+ if (acpi_gbl_leave_wake_gpes_disabled) {
continue;
+ }
}
- if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD))
+ /* Ignore GPEs that have no corresponding _Lxx/_Exx method */
+
+ if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD)) {
continue;
+ }
+
+ /* Enable this GPE */
gpe_number = gpe_index + gpe_block->block_base_number;
status = acpi_enable_gpe(gpe_device, gpe_number,
- ACPI_GPE_TYPE_RUNTIME);
- if (ACPI_FAILURE(status))
- ACPI_ERROR((AE_INFO,
- "Failed to enable GPE %02X\n",
+ ACPI_GPE_TYPE_RUNTIME);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Could not enable GPE 0x%02X",
gpe_number));
- else
- gpe_enabled_count++;
+ continue;
+ }
+
+ gpe_enabled_count++;
}
}