PCI/ACPI: move _OSC code to pci_root.c
Move PCI _OSC management code from drivers/pci/pci-acpi.c to
drivers/acpi/pci_root.c. The benefits are
- We no longer need struct osc_data and its management code (contents
are moved to struct acpi_pci_root). This simplify the code, and we
no longer care about kmalloc() failure.
- We can make pci_acpi_osc_support() be a static function, which is
called only from drivers/acpi/pci_root.c.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Reviewed-by: Andrew Patterson <andrew.patterson@hp.com>
Tested-by: Andrew Patterson <andrew.patterson@hp.com>
Acked-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 5b38a02..979eccc 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -66,11 +66,18 @@
struct acpi_device * device;
struct acpi_pci_id id;
struct pci_bus *bus;
+
+ u32 osc_support_set; /* _OSC state of support bits */
+ u32 osc_control_set; /* _OSC state of control bits */
+ u32 osc_control_qry; /* the latest _OSC query result */
+
+ u32 osc_queried:1; /* has _OSC control been queried? */
};
static LIST_HEAD(acpi_pci_roots);
static struct acpi_pci_driver *sub_driver;
+static DEFINE_MUTEX(osc_lock);
int acpi_pci_register_driver(struct acpi_pci_driver *driver)
{
@@ -185,6 +192,175 @@
}
}
+static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40,
+ 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
+
+static acpi_status acpi_pci_run_osc(acpi_handle handle,
+ const u32 *capbuf, u32 *retval)
+{
+ acpi_status status;
+ struct acpi_object_list input;
+ union acpi_object in_params[4];
+ struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
+ union acpi_object *out_obj;
+ u32 errors;
+
+ /* Setting up input parameters */
+ input.count = 4;
+ input.pointer = in_params;
+ in_params[0].type = ACPI_TYPE_BUFFER;
+ in_params[0].buffer.length = 16;
+ in_params[0].buffer.pointer = OSC_UUID;
+ in_params[1].type = ACPI_TYPE_INTEGER;
+ in_params[1].integer.value = 1;
+ in_params[2].type = ACPI_TYPE_INTEGER;
+ in_params[2].integer.value = 3;
+ in_params[3].type = ACPI_TYPE_BUFFER;
+ in_params[3].buffer.length = 12;
+ in_params[3].buffer.pointer = (u8 *)capbuf;
+
+ status = acpi_evaluate_object(handle, "_OSC", &input, &output);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ if (!output.length)
+ return AE_NULL_OBJECT;
+
+ out_obj = output.pointer;
+ if (out_obj->type != ACPI_TYPE_BUFFER) {
+ printk(KERN_DEBUG "_OSC evaluation returned wrong type\n");
+ status = AE_TYPE;
+ goto out_kfree;
+ }
+ /* Need to ignore the bit0 in result code */
+ errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
+ if (errors) {
+ if (errors & OSC_REQUEST_ERROR)
+ printk(KERN_DEBUG "_OSC request failed\n");
+ if (errors & OSC_INVALID_UUID_ERROR)
+ printk(KERN_DEBUG "_OSC invalid UUID\n");
+ if (errors & OSC_INVALID_REVISION_ERROR)
+ printk(KERN_DEBUG "_OSC invalid revision\n");
+ if (errors & OSC_CAPABILITIES_MASK_ERROR) {
+ if (capbuf[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE)
+ goto out_success;
+ printk(KERN_DEBUG
+ "Firmware did not grant requested _OSC control\n");
+ status = AE_SUPPORT;
+ goto out_kfree;
+ }
+ status = AE_ERROR;
+ goto out_kfree;
+ }
+out_success:
+ *retval = *((u32 *)(out_obj->buffer.pointer + 8));
+ status = AE_OK;
+
+out_kfree:
+ kfree(output.pointer);
+ return status;
+}
+
+static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 flags)
+{
+ acpi_status status;
+ u32 support_set, result, capbuf[3];
+
+ /* do _OSC query for all possible controls */
+ support_set = root->osc_support_set | (flags & OSC_SUPPORT_MASKS);
+ capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
+ capbuf[OSC_SUPPORT_TYPE] = support_set;
+ capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
+
+ status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
+ if (ACPI_SUCCESS(status)) {
+ root->osc_support_set = support_set;
+ root->osc_control_qry = result;
+ root->osc_queried = 1;
+ }
+ return status;
+}
+
+static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
+{
+ acpi_status status;
+ acpi_handle tmp;
+
+ status = acpi_get_handle(root->device->handle, "_OSC", &tmp);
+ if (ACPI_FAILURE(status))
+ return status;
+ mutex_lock(&osc_lock);
+ status = acpi_pci_query_osc(root, flags);
+ mutex_unlock(&osc_lock);
+ return status;
+}
+
+static struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
+{
+ struct acpi_pci_root *root;
+ list_for_each_entry(root, &acpi_pci_roots, node) {
+ if (root->device->handle == handle)
+ return root;
+ }
+ return NULL;
+}
+
+/**
+ * pci_osc_control_set - commit requested control to Firmware
+ * @handle: acpi_handle for the target ACPI object
+ * @flags: driver's requested control bits
+ *
+ * Attempt to take control from Firmware on requested control bits.
+ **/
+acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
+{
+ acpi_status status;
+ u32 control_req, result, capbuf[3];
+ acpi_handle tmp;
+ struct acpi_pci_root *root;
+
+ status = acpi_get_handle(handle, "_OSC", &tmp);
+ if (ACPI_FAILURE(status))
+ return status;
+
+ control_req = (flags & OSC_CONTROL_MASKS);
+ if (!control_req)
+ return AE_TYPE;
+
+ root = acpi_pci_find_root(handle);
+ if (!root)
+ return AE_NOT_EXIST;
+
+ mutex_lock(&osc_lock);
+ /* No need to evaluate _OSC if the control was already granted. */
+ if ((root->osc_control_set & control_req) == control_req)
+ goto out;
+
+ /* Need to query controls first before requesting them */
+ if (!root->osc_queried) {
+ status = acpi_pci_query_osc(root, root->osc_support_set);
+ if (ACPI_FAILURE(status))
+ goto out;
+ }
+ if ((root->osc_control_qry & control_req) != control_req) {
+ printk(KERN_DEBUG
+ "Firmware did not grant requested _OSC control\n");
+ status = AE_SUPPORT;
+ goto out;
+ }
+
+ capbuf[OSC_QUERY_TYPE] = 0;
+ capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set;
+ capbuf[OSC_CONTROL_TYPE] = root->osc_control_set | control_req;
+ status = acpi_pci_run_osc(handle, capbuf, &result);
+ if (ACPI_SUCCESS(status))
+ root->osc_control_set = result;
+out:
+ mutex_unlock(&osc_lock);
+ return status;
+}
+EXPORT_SYMBOL(pci_osc_control_set);
+
static int __devinit acpi_pci_root_add(struct acpi_device *device)
{
int result = 0;
@@ -217,7 +393,7 @@
* PCI domains, so we indicate this in _OSC support capabilities.
*/
flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
- pci_acpi_osc_support(device->handle, flags);
+ acpi_pci_osc_support(root, flags);
/*
* Segment
@@ -353,7 +529,7 @@
if (pci_msi_enabled())
flags |= OSC_MSI_SUPPORT;
if (flags != base_flags)
- pci_acpi_osc_support(device->handle, flags);
+ acpi_pci_osc_support(root, flags);
end:
if (result) {