* scan.c - support for transforming the ACPI namespace into individual objects
*/
+#define pr_fmt(fmt) "ACPI: " fmt
+
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/acpi_iort.h>
+#include <linux/acpi_viot.h>
+#include <linux/iommu.h>
#include <linux/signal.h>
#include <linux/kthread.h>
#include <linux/dmi.h>
-#include <linux/nls.h>
#include <linux/dma-map-ops.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/pgtable.h>
*/
static u64 spcr_uart_addr;
-struct acpi_dep_data {
- struct list_head node;
- acpi_handle supplier;
- acpi_handle consumer;
-};
-
void acpi_scan_lock_acquire(void)
{
mutex_lock(&acpi_scan_lock);
return handle_to_device(handle, get_acpi_device);
}
-void acpi_bus_put_acpi_device(struct acpi_device *adev)
-{
- acpi_dev_put(adev);
-}
-
static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
{
struct acpi_device_bus_id *acpi_device_bus_id;
return 0;
}
-int acpi_device_add(struct acpi_device *device,
- void (*release)(struct device *))
+static int acpi_tie_acpi_dev(struct acpi_device *adev)
{
- struct acpi_device_bus_id *acpi_device_bus_id;
- int result;
+ acpi_handle handle = adev->handle;
+ acpi_status status;
- if (device->handle) {
- acpi_status status;
+ if (!handle)
+ return 0;
- status = acpi_attach_data(device->handle, acpi_scan_drop_device,
- device);
- if (ACPI_FAILURE(status)) {
- acpi_handle_err(device->handle,
- "Unable to attach device data\n");
- return -ENODEV;
- }
+ status = acpi_attach_data(handle, acpi_scan_drop_device, adev);
+ if (ACPI_FAILURE(status)) {
+ acpi_handle_err(handle, "Unable to attach device data\n");
+ return -ENODEV;
}
+ return 0;
+}
+
+static int __acpi_device_add(struct acpi_device *device,
+ void (*release)(struct device *))
+{
+ struct acpi_device_bus_id *acpi_device_bus_id;
+ int result;
+
/*
* Linkage
* -------
result = acpi_device_setup_files(device);
if (result)
- printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
+ pr_err("Error creating sysfs interface for device %s\n",
dev_name(&device->dev));
return 0;
return result;
}
+int acpi_device_add(struct acpi_device *adev, void (*release)(struct device *))
+{
+ int ret;
+
+ ret = acpi_tie_acpi_dev(adev);
+ if (ret)
+ return ret;
+
+ return __acpi_device_add(adev, release);
+}
+
/* --------------------------------------------------------------------------
Device Enumeration
-------------------------------------------------------------------------- */
acpi_get_object_info(handle, &info);
if (!info) {
- pr_err(PREFIX "%s: Error reading device info\n",
- __func__);
+ pr_err("%s: Error reading device info\n", __func__);
return;
}
*
* Return false if DMA is not supported. Otherwise, return true
*/
-bool acpi_dma_supported(struct acpi_device *adev)
+bool acpi_dma_supported(const struct acpi_device *adev)
{
if (!adev)
return false;
return ret >= 0 ? 0 : ret;
}
+#ifdef CONFIG_IOMMU_API
+int acpi_iommu_fwspec_init(struct device *dev, u32 id,
+ struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops)
+{
+ int ret = iommu_fwspec_init(dev, fwnode, ops);
+
+ if (!ret)
+ ret = iommu_fwspec_add_ids(dev, &id, 1);
+
+ return ret;
+}
+
+static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+
+ return fwspec ? fwspec->ops : NULL;
+}
+
+static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
+ const u32 *id_in)
+{
+ int err;
+ const struct iommu_ops *ops;
+
+ /*
+ * If we already translated the fwspec there is nothing left to do,
+ * return the iommu_ops.
+ */
+ ops = acpi_iommu_fwspec_ops(dev);
+ if (ops)
+ return ops;
+
+ err = iort_iommu_configure_id(dev, id_in);
+ if (err && err != -EPROBE_DEFER)
+ err = viot_iommu_configure(dev);
+
+ /*
+ * If we have reason to believe the IOMMU driver missed the initial
+ * iommu_probe_device() call for dev, replay it to get things in order.
+ */
+ if (!err && dev->bus && !device_iommu_mapped(dev))
+ err = iommu_probe_device(dev);
+
+ /* Ignore all other errors apart from EPROBE_DEFER */
+ if (err == -EPROBE_DEFER) {
+ return ERR_PTR(err);
+ } else if (err) {
+ dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
+ return NULL;
+ }
+ return acpi_iommu_fwspec_ops(dev);
+}
+
+#else /* !CONFIG_IOMMU_API */
+
+int acpi_iommu_fwspec_init(struct device *dev, u32 id,
+ struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops)
+{
+ return -ENODEV;
+}
+
+static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
+ const u32 *id_in)
+{
+ return NULL;
+}
+
+#endif /* !CONFIG_IOMMU_API */
+
/**
* acpi_dma_configure_id - Set-up DMA configuration for the device.
* @dev: The pointer to the device
return 0;
}
- iort_dma_setup(dev, &dma_addr, &size);
+ acpi_arch_dma_setup(dev, &dma_addr, &size);
- iommu = iort_iommu_configure_id(dev, input_id);
+ iommu = acpi_iommu_configure_id(dev, input_id);
if (PTR_ERR(iommu) == -EPROBE_DEFER)
return -EPROBE_DEFER;
device_initialize(&device->dev);
dev_set_uevent_suppress(&device->dev, true);
acpi_init_coherency(device);
- /* Assume there are unmet deps to start with. */
- device->dep_unmet = 1;
+}
+
+static void acpi_scan_dep_init(struct acpi_device *adev)
+{
+ struct acpi_dep_data *dep;
+
+ list_for_each_entry(dep, &acpi_dep_list, node) {
+ if (dep->consumer == adev->handle)
+ adev->dep_unmet++;
+ }
}
void acpi_device_add_finalize(struct acpi_device *device)
}
static int acpi_add_single_object(struct acpi_device **child,
- acpi_handle handle, int type)
+ acpi_handle handle, int type, bool dep_init)
{
struct acpi_device *device;
+ bool release_dep_lock = false;
int result;
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
* acpi_bus_get_status() and use its quirk handling. Note that
* this must be done before the get power-/wakeup_dev-flags calls.
*/
- if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR)
+ if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) {
+ if (dep_init) {
+ mutex_lock(&acpi_dep_list_lock);
+ /*
+ * Hold the lock until the acpi_tie_acpi_dev() call
+ * below to prevent concurrent acpi_scan_clear_dep()
+ * from deleting a dependency list entry without
+ * updating dep_unmet for the device.
+ */
+ release_dep_lock = true;
+ acpi_scan_dep_init(device);
+ }
acpi_scan_init_status(device);
+ }
acpi_bus_get_power_flags(device);
acpi_bus_get_wakeup_device_flags(device);
- result = acpi_device_add(device, acpi_device_release);
+ result = acpi_tie_acpi_dev(device);
+
+ if (release_dep_lock)
+ mutex_unlock(&acpi_dep_list_lock);
+
+ if (!result)
+ result = __acpi_device_add(device, acpi_device_release);
+
if (result) {
acpi_device_release(&device->dev);
return result;
return count;
}
-static void acpi_scan_dep_init(struct acpi_device *adev)
-{
- struct acpi_dep_data *dep;
-
- adev->dep_unmet = 0;
-
- mutex_lock(&acpi_dep_list_lock);
-
- list_for_each_entry(dep, &acpi_dep_list, node) {
- if (dep->consumer == adev->handle)
- adev->dep_unmet++;
- }
-
- mutex_unlock(&acpi_dep_list_lock);
-}
-
static bool acpi_bus_scan_second_pass;
static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep,
return AE_OK;
}
- acpi_add_single_object(&device, handle, type);
- if (!device)
- return AE_CTRL_DEPTH;
-
- acpi_scan_init_hotplug(device);
/*
* If check_dep is true at this point, the device has no dependencies,
* or the creation of the device object would have been postponed above.
*/
- if (check_dep)
- device->dep_unmet = 0;
- else
- acpi_scan_dep_init(device);
+ acpi_add_single_object(&device, handle, type, !check_dep);
+ if (!device)
+ return AE_CTRL_DEPTH;
+
+ acpi_scan_init_hotplug(device);
out:
if (!*adev_p)
device->handler->hotplug.notify_online(device);
}
-void acpi_walk_dep_device_list(acpi_handle handle)
+static int acpi_dev_get_first_consumer_dev_cb(struct acpi_dep_data *dep, void *data)
{
- struct acpi_dep_data *dep, *tmp;
struct acpi_device *adev;
+ adev = acpi_bus_get_acpi_device(dep->consumer);
+ if (adev) {
+ *(struct acpi_device **)data = adev;
+ return 1;
+ }
+ /* Continue parsing if the device object is not present. */
+ return 0;
+}
+
+struct acpi_scan_clear_dep_work {
+ struct work_struct work;
+ struct acpi_device *adev;
+};
+
+static void acpi_scan_clear_dep_fn(struct work_struct *work)
+{
+ struct acpi_scan_clear_dep_work *cdw;
+
+ cdw = container_of(work, struct acpi_scan_clear_dep_work, work);
+
+ acpi_scan_lock_acquire();
+ acpi_bus_attach(cdw->adev, true);
+ acpi_scan_lock_release();
+
+ acpi_dev_put(cdw->adev);
+ kfree(cdw);
+}
+
+static bool acpi_scan_clear_dep_queue(struct acpi_device *adev)
+{
+ struct acpi_scan_clear_dep_work *cdw;
+
+ if (adev->dep_unmet)
+ return false;
+
+ cdw = kmalloc(sizeof(*cdw), GFP_KERNEL);
+ if (!cdw)
+ return false;
+
+ cdw->adev = adev;
+ INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn);
+ /*
+ * Since the work function may block on the lock until the entire
+ * initial enumeration of devices is complete, put it into the unbound
+ * workqueue.
+ */
+ queue_work(system_unbound_wq, &cdw->work);
+
+ return true;
+}
+
+static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data)
+{
+ struct acpi_device *adev = acpi_bus_get_acpi_device(dep->consumer);
+
+ if (adev) {
+ adev->dep_unmet--;
+ if (!acpi_scan_clear_dep_queue(adev))
+ acpi_dev_put(adev);
+ }
+
+ list_del(&dep->node);
+ kfree(dep);
+
+ return 0;
+}
+
+/**
+ * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list
+ * @handle: The ACPI handle of the supplier device
+ * @callback: Pointer to the callback function to apply
+ * @data: Pointer to some data to pass to the callback
+ *
+ * The return value of the callback determines this function's behaviour. If 0
+ * is returned we continue to iterate over acpi_dep_list. If a positive value
+ * is returned then the loop is broken but this function returns 0. If a
+ * negative value is returned by the callback then the loop is broken and that
+ * value is returned as the final error.
+ */
+static int acpi_walk_dep_device_list(acpi_handle handle,
+ int (*callback)(struct acpi_dep_data *, void *),
+ void *data)
+{
+ struct acpi_dep_data *dep, *tmp;
+ int ret = 0;
+
mutex_lock(&acpi_dep_list_lock);
list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
if (dep->supplier == handle) {
- acpi_bus_get_device(dep->consumer, &adev);
-
- if (adev) {
- adev->dep_unmet--;
- if (!adev->dep_unmet)
- acpi_bus_attach(adev, true);
- }
-
- list_del(&dep->node);
- kfree(dep);
+ ret = callback(dep, data);
+ if (ret)
+ break;
}
}
mutex_unlock(&acpi_dep_list_lock);
+
+ return ret > 0 ? 0 : ret;
+}
+
+/**
+ * acpi_dev_clear_dependencies - Inform consumers that the device is now active
+ * @supplier: Pointer to the supplier &struct acpi_device
+ *
+ * Clear dependencies on the given device.
+ */
+void acpi_dev_clear_dependencies(struct acpi_device *supplier)
+{
+ acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL);
+}
+EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies);
+
+/**
+ * acpi_dev_get_first_consumer_dev - Return ACPI device dependent on @supplier
+ * @supplier: Pointer to the dependee device
+ *
+ * Returns the first &struct acpi_device which declares itself dependent on
+ * @supplier via the _DEP buffer, parsed from the acpi_dep_list.
+ *
+ * The caller is responsible for putting the reference to adev when it is no
+ * longer needed.
+ */
+struct acpi_device *acpi_dev_get_first_consumer_dev(struct acpi_device *supplier)
+{
+ struct acpi_device *adev = NULL;
+
+ acpi_walk_dep_device_list(supplier->handle,
+ acpi_dev_get_first_consumer_dev_cb, &adev);
+
+ return adev;
}
-EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
+EXPORT_SYMBOL_GPL(acpi_dev_get_first_consumer_dev);
/**
* acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
struct acpi_device *device = NULL;
int result;
- result = acpi_add_single_object(&device, NULL, type);
+ result = acpi_add_single_object(&device, NULL, type, false);
if (result)
return result;
struct acpi_device *device = NULL;
result = acpi_add_single_object(&device, NULL,
- ACPI_BUS_TYPE_POWER_BUTTON);
+ ACPI_BUS_TYPE_POWER_BUTTON, false);
if (result)
return result;
struct acpi_device *device = NULL;
result = acpi_add_single_object(&device, NULL,
- ACPI_BUS_TYPE_SLEEP_BUTTON);
+ ACPI_BUS_TYPE_SLEEP_BUTTON, false);
if (result)
return result;
status = acpi_get_table(ACPI_SIG_SPCR, 0,
(struct acpi_table_header **)&spcr_ptr);
if (ACPI_FAILURE(status)) {
- pr_warn(PREFIX "STAO table present, but SPCR is missing\n");
+ pr_warn("STAO table present, but SPCR is missing\n");
return;
}
(struct acpi_table_header **)&stao_ptr);
if (ACPI_SUCCESS(status)) {
if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
- pr_info(PREFIX "STAO Name List not yet supported.\n");
+ pr_info("STAO Name List not yet supported.\n");
if (stao_ptr->ignore_uart)
acpi_get_spcr_uart_addr();
}
}
- acpi_turn_off_unused_power_resources(true);
+ acpi_turn_off_unused_power_resources();
acpi_scan_initialized = true;
return count;
}
-struct acpi_table_events_work {
- struct work_struct work;
- void *table;
- u32 event;
-};
-
static void acpi_table_events_fn(struct work_struct *work)
{
- struct acpi_table_events_work *tew;
-
- tew = container_of(work, struct acpi_table_events_work, work);
+ acpi_scan_lock_acquire();
+ acpi_bus_scan(ACPI_ROOT_OBJECT);
+ acpi_scan_lock_release();
- if (tew->event == ACPI_TABLE_EVENT_LOAD) {
- acpi_scan_lock_acquire();
- acpi_bus_scan(ACPI_ROOT_OBJECT);
- acpi_scan_lock_release();
- }
-
- kfree(tew);
+ kfree(work);
}
-void acpi_scan_table_handler(u32 event, void *table, void *context)
+void acpi_scan_table_notify(void)
{
- struct acpi_table_events_work *tew;
+ struct work_struct *work;
if (!acpi_scan_initialized)
return;
- if (event != ACPI_TABLE_EVENT_LOAD)
+ work = kmalloc(sizeof(*work), GFP_KERNEL);
+ if (!work)
return;
- tew = kmalloc(sizeof(*tew), GFP_KERNEL);
- if (!tew)
- return;
-
- INIT_WORK(&tew->work, acpi_table_events_fn);
- tew->table = table;
- tew->event = event;
-
- schedule_work(&tew->work);
+ INIT_WORK(work, acpi_table_events_fn);
+ schedule_work(work);
}
int acpi_reconfig_notifier_register(struct notifier_block *nb)
projects / linux-2.6-microblaze.git / blobdiff