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ACPI: property: Add support for parsing buffer property UUID

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Add support for newly added buffer property UUID, as defined in the DSD
guide section 3.3 [1]

Link: https://github.com/UEFI/DSD-Guide/blob/main/src/dsd-guide.adoc#buffer-data-extension-uuid # [1]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sakari Ailus 2022-07-22 09:57:46 +03:00 committed by Rafael J. Wysocki
parent 9230441333
commit 103e10c69c
3 changed files with 132 additions and 15 deletions
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142
drivers/acpi/property.c
View File

@ -55,14 +55,19 @@ static const guid_t ads_guid =
GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
static const guid_t buffer_prop_guid =
GUID_INIT(0xedb12dd0, 0x363d, 0x4085,
0xa3, 0xd2, 0x49, 0x52, 0x2c, 0xa1, 0x60, 0xc4);
static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
const union acpi_object *desc,
union acpi_object *desc,
struct acpi_device_data *data,
struct fwnode_handle *parent);
static bool acpi_extract_properties(const union acpi_object *desc,
static bool acpi_extract_properties(acpi_handle handle,
union acpi_object *desc,
struct acpi_device_data *data);
static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
static bool acpi_nondev_subnode_extract(union acpi_object *desc,
acpi_handle handle,
const union acpi_object *link,
struct list_head *list,
@ -81,7 +86,7 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
INIT_LIST_HEAD(&dn->data.properties);
INIT_LIST_HEAD(&dn->data.subnodes);
result = acpi_extract_properties(desc, &dn->data);
result = acpi_extract_properties(handle, desc, &dn->data);
if (handle) {
acpi_handle scope;
@ -156,7 +161,7 @@ static bool acpi_nondev_subnode_ok(acpi_handle scope,
}
static bool acpi_add_nondev_subnodes(acpi_handle scope,
const union acpi_object *links,
union acpi_object *links,
struct list_head *list,
struct fwnode_handle *parent)
{
@ -164,7 +169,7 @@ static bool acpi_add_nondev_subnodes(acpi_handle scope,
int i;
for (i = 0; i < links->package.count; i++) {
const union acpi_object *link, *desc;
union acpi_object *link, *desc;
acpi_handle handle;
bool result;
@ -204,7 +209,7 @@ static bool acpi_add_nondev_subnodes(acpi_handle scope,
}
static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
const union acpi_object *desc,
union acpi_object *desc,
struct acpi_device_data *data,
struct fwnode_handle *parent)
{
@ -212,7 +217,8 @@ static bool acpi_enumerate_nondev_subnodes(acpi_handle scope,
/* Look for the ACPI data subnodes GUID. */
for (i = 0; i < desc->package.count; i += 2) {
const union acpi_object *guid, *links;
const union acpi_object *guid;
union acpi_object *links;
guid = &desc->package.elements[i];
links = &desc->package.elements[i + 1];
@ -325,7 +331,7 @@ static bool acpi_is_property_guid(const guid_t *guid)
struct acpi_device_properties *
acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
const union acpi_object *properties)
union acpi_object *properties)
{
struct acpi_device_properties *props;
@ -377,7 +383,104 @@ static bool acpi_tie_nondev_subnodes(struct acpi_device_data *data)
return true;
}
static bool acpi_extract_properties(const union acpi_object *desc,
static void acpi_data_add_buffer_props(acpi_handle handle,
struct acpi_device_data *data,
union acpi_object *properties)
{
struct acpi_device_properties *props;
union acpi_object *package;
size_t alloc_size;
unsigned int i;
u32 *count;
if (check_mul_overflow((size_t)properties->package.count,
sizeof(*package) + sizeof(void *),
&alloc_size) ||
check_add_overflow(sizeof(*props) + sizeof(*package), alloc_size,
&alloc_size)) {
acpi_handle_warn(handle,
"can't allocate memory for %u buffer props",
properties->package.count);
return;
}
props = kvzalloc(alloc_size, GFP_KERNEL);
if (!props)
return;
props->guid = &buffer_prop_guid;
props->bufs = (void *)(props + 1);
props->properties = (void *)(props->bufs + properties->package.count);
/* Outer package */
package = props->properties;
package->type = ACPI_TYPE_PACKAGE;
package->package.elements = package + 1;
count = &package->package.count;
*count = 0;
/* Inner packages */
package++;
for (i = 0; i < properties->package.count; i++) {
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
union acpi_object *property = &properties->package.elements[i];
union acpi_object *prop, *obj, *buf_obj;
acpi_status status;
if (property->type != ACPI_TYPE_PACKAGE ||
property->package.count != 2) {
acpi_handle_warn(handle,
"buffer property %u has %u entries\n",
i, property->package.count);
continue;
}
prop = &property->package.elements[0];
obj = &property->package.elements[1];
if (prop->type != ACPI_TYPE_STRING ||
obj->type != ACPI_TYPE_STRING) {
acpi_handle_warn(handle,
"wrong object types %u and %u\n",
prop->type, obj->type);
continue;
}
status = acpi_evaluate_object_typed(handle, obj->string.pointer,
NULL, &buf,
ACPI_TYPE_BUFFER);
if (ACPI_FAILURE(status)) {
acpi_handle_warn(handle,
"can't evaluate \"%*pE\" as buffer\n",
obj->string.length,
obj->string.pointer);
continue;
}
package->type = ACPI_TYPE_PACKAGE;
package->package.elements = prop;
package->package.count = 2;
buf_obj = buf.pointer;
/* Replace the string object with a buffer object */
obj->type = ACPI_TYPE_BUFFER;
obj->buffer.length = buf_obj->buffer.length;
obj->buffer.pointer = buf_obj->buffer.pointer;
props->bufs[i] = buf.pointer;
package++;
(*count)++;
}
if (*count)
list_add(&props->list, &data->properties);
else
kvfree(props);
}
static bool acpi_extract_properties(acpi_handle scope, union acpi_object *desc,
struct acpi_device_data *data)
{
int i;
@ -387,7 +490,8 @@ static bool acpi_extract_properties(const union acpi_object *desc,
/* Look for the device properties GUID. */
for (i = 0; i < desc->package.count; i += 2) {
const union acpi_object *guid, *properties;
const union acpi_object *guid;
union acpi_object *properties;
guid = &desc->package.elements[i];
properties = &desc->package.elements[i + 1];
@ -401,6 +505,12 @@ static bool acpi_extract_properties(const union acpi_object *desc,
properties->type != ACPI_TYPE_PACKAGE)
break;
if (guid_equal((guid_t *)guid->buffer.pointer,
&buffer_prop_guid)) {
acpi_data_add_buffer_props(scope, data, properties);
continue;
}
if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
continue;
@ -447,7 +557,7 @@ void acpi_init_properties(struct acpi_device *adev)
if (ACPI_FAILURE(status))
goto out;
if (acpi_extract_properties(buf.pointer, &adev->data)) {
if (acpi_extract_properties(adev->handle, buf.pointer, &adev->data)) {
adev->data.pointer = buf.pointer;
if (acpi_of)
acpi_init_of_compatible(adev);
@ -477,8 +587,14 @@ static void acpi_free_device_properties(struct list_head *list)
struct acpi_device_properties *props, *tmp;
list_for_each_entry_safe(props, tmp, list, list) {
u32 i;
list_del(&props->list);
kfree(props);
/* Buffer data properties were separately allocated */
if (props->bufs)
for (i = 0; i < props->properties->package.count; i++)
ACPI_FREE(props->bufs[i]);
kvfree(props);
}
}

3
include/acpi/acpi_bus.h
View File

@ -344,8 +344,9 @@ struct acpi_device_physical_node {
struct acpi_device_properties {
const guid_t *guid;
const union acpi_object *properties;
union acpi_object *properties;
struct list_head list;
void **bufs;
};
/* ACPI Device Specific Data (_DSD) */

2
include/linux/acpi.h
View File

@ -1243,7 +1243,7 @@ static inline bool acpi_dev_has_props(const struct acpi_device *adev)
struct acpi_device_properties *
acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
const union acpi_object *properties);
union acpi_object *properties);
int acpi_node_prop_get(const struct fwnode_handle *fwnode, const char *propname,
void **valptr);