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ACPI / property: Allow multiple property compatible _DSD entries 

It is possible to have _DSD entries where the data is compatible with
device properties format but are using different GUID for various reasons.
In addition to that there can be many such _DSD entries for a single device
such as for PCIe root port used to host a Thunderbolt hierarchy:

    Scope (\_SB.PCI0.RP21)
    {
        Name (_DSD, Package () {
            ToUUID ("6211e2c0-58a3-4af3-90e1-927a4e0c55a4"),
            Package () {
                Package () {"HotPlugSupportInD3", 1}
            },

            ToUUID ("efcc06cc-73ac-4bc3-bff0-76143807c389"),
            Package () {
                Package () {"ExternalFacingPort", 1},
                Package () {"UID", 0 }
            }
        })
    }

More information about these new _DSD entries can be found in:

  https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports

To make these available for drivers via unified device property APIs,
modify ACPI property core so that it supports multiple _DSD entries
organized in a linked list. We also store GUID of each _DSD entry in struct
acpi_device_properties in case there is need to differentiate between
entries. The supported GUIDs are then listed in prp_guids array.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
This commit is contained in:
Mika Westerberg 2018-09-27 16:57:05 -05:00 committed by Bjorn Helgaas
parent 0e157e5286
commit 5f5e4890d5
5 changed files with 86 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

94
drivers/acpi/property.c
View File

@ -24,11 +24,12 @@ static int acpi_data_get_property_array(const struct acpi_device_data *data,
acpi_object_type type,
const union acpi_object **obj);
/* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
static const guid_t prp_guid =
static const guid_t prp_guids[] = {
/* ACPI _DSD device properties GUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */
GUID_INIT(0xdaffd814, 0x6eba, 0x4d8c,
0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01);
/* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795-1319f52a966b */
0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01),
};
static const guid_t ads_guid =
GUID_INIT(0xdbb8e3e6, 0x5886, 0x4ba6,
0x87, 0x95, 0x13, 0x19, 0xf5, 0x2a, 0x96, 0x6b);
@ -56,6 +57,7 @@ static bool acpi_nondev_subnode_extract(const union acpi_object *desc,
dn->name = link->package.elements[0].string.pointer;
dn->fwnode.ops = &acpi_data_fwnode_ops;
dn->parent = parent;
INIT_LIST_HEAD(&dn->data.properties);
INIT_LIST_HEAD(&dn->data.subnodes);
result = acpi_extract_properties(desc, &dn->data);
@ -288,6 +290,35 @@ static void acpi_init_of_compatible(struct acpi_device *adev)
adev->flags.of_compatible_ok = 1;
}
static bool acpi_is_property_guid(const guid_t *guid)
{
int i;
for (i = 0; i < ARRAY_SIZE(prp_guids); i++) {
if (guid_equal(guid, &prp_guids[i]))
return true;
}
return false;
}
struct acpi_device_properties *
acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
const union acpi_object *properties)
{
struct acpi_device_properties *props;
props = kzalloc(sizeof(*props), GFP_KERNEL);
if (props) {
INIT_LIST_HEAD(&props->list);
props->guid = guid;
props->properties = properties;
list_add_tail(&props->list, &data->properties);
}
return props;
}
static bool acpi_extract_properties(const union acpi_object *desc,
struct acpi_device_data *data)
{
@ -312,7 +343,7 @@ static bool acpi_extract_properties(const union acpi_object *desc,
properties->type != ACPI_TYPE_PACKAGE)
break;
if (!guid_equal((guid_t *)guid->buffer.pointer, &prp_guid))
if (!acpi_is_property_guid((guid_t *)guid->buffer.pointer))
continue;
/*
@ -320,13 +351,13 @@ static bool acpi_extract_properties(const union acpi_object *desc,
* package immediately following it.
*/
if (!acpi_properties_format_valid(properties))
break;
continue;
data->properties = properties;
return true;
acpi_data_add_props(data, (const guid_t *)guid->buffer.pointer,
properties);
}
return false;
return !list_empty(&data->properties);
}
void acpi_init_properties(struct acpi_device *adev)
@ -336,6 +367,7 @@ void acpi_init_properties(struct acpi_device *adev)
acpi_status status;
bool acpi_of = false;
INIT_LIST_HEAD(&adev->data.properties);
INIT_LIST_HEAD(&adev->data.subnodes);
if (!adev->handle)
@ -398,11 +430,16 @@ static void acpi_destroy_nondev_subnodes(struct list_head *list)
void acpi_free_properties(struct acpi_device *adev)
{
struct acpi_device_properties *props, *tmp;
acpi_destroy_nondev_subnodes(&adev->data.subnodes);
ACPI_FREE((void *)adev->data.pointer);
adev->data.of_compatible = NULL;
adev->data.pointer = NULL;
adev->data.properties = NULL;
list_for_each_entry_safe(props, tmp, &adev->data.properties, list) {
list_del(&props->list);
kfree(props);
}
}
/**
@ -427,32 +464,37 @@ static int acpi_data_get_property(const struct acpi_device_data *data,
const char *name, acpi_object_type type,
const union acpi_object **obj)
{
const union acpi_object *properties;
int i;
const struct acpi_device_properties *props;
if (!data || !name)
return -EINVAL;
if (!data->pointer || !data->properties)
if (!data->pointer || list_empty(&data->properties))
return -EINVAL;
properties = data->properties;
for (i = 0; i < properties->package.count; i++) {
const union acpi_object *propname, *propvalue;
const union acpi_object *property;
list_for_each_entry(props, &data->properties, list) {
const union acpi_object *properties;
unsigned int i;
property = &properties->package.elements[i];
properties = props->properties;
for (i = 0; i < properties->package.count; i++) {
const union acpi_object *propname, *propvalue;
const union acpi_object *property;
propname = &property->package.elements[0];
propvalue = &property->package.elements[1];
property = &properties->package.elements[i];
if (!strcmp(name, propname->string.pointer)) {
if (type != ACPI_TYPE_ANY && propvalue->type != type)
return -EPROTO;
if (obj)
*obj = propvalue;
propname = &property->package.elements[0];
propvalue = &property->package.elements[1];
return 0;
if (!strcmp(name, propname->string.pointer)) {
if (type != ACPI_TYPE_ANY &&
propvalue->type != type)
return -EPROTO;
if (obj)
*obj = propvalue;
return 0;
}
}
}
return -EINVAL;

2
drivers/acpi/x86/apple.c
View File

@ -132,8 +132,8 @@ void acpi_extract_apple_properties(struct acpi_device *adev)
}
WARN_ON(free_space != (void *)newprops + newsize);
adev->data.properties = newprops;
adev->data.pointer = newprops;
acpi_data_add_props(&adev->data, &apple_prp_guid, newprops);
out_free:
ACPI_FREE(props);

2
drivers/gpio/gpiolib-acpi.c
View File

@ -1198,7 +1198,7 @@ int acpi_gpio_count(struct device *dev, const char *con_id)
bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
{
/* Never allow fallback if the device has properties */
if (adev->data.properties || adev->driver_gpios)
if (acpi_dev_has_props(adev) || adev->driver_gpios)
return false;
return con_id == NULL;

8
include/acpi/acpi_bus.h
View File

@ -346,10 +346,16 @@ struct acpi_device_physical_node {
bool put_online:1;
};
struct acpi_device_properties {
const guid_t *guid;
const union acpi_object *properties;
struct list_head list;
};
/* ACPI Device Specific Data (_DSD) */
struct acpi_device_data {
const union acpi_object *pointer;
const union acpi_object *properties;
struct list_head properties;
const union acpi_object *of_compatible;
struct list_head subnodes;
};

9
include/linux/acpi.h
View File

@ -1074,6 +1074,15 @@ static inline int acpi_node_get_property_reference(
NR_FWNODE_REFERENCE_ARGS, args);
}
static inline bool acpi_dev_has_props(const struct acpi_device *adev)
{
return !list_empty(&adev->data.properties);
}
struct acpi_device_properties *
acpi_data_add_props(struct acpi_device_data *data, const guid_t *guid,
const union acpi_object *properties);
int acpi_node_prop_get(const struct fwnode_handle *fwnode, const char *propname,
void **valptr);
int acpi_dev_prop_read_single(struct acpi_device *adev,