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path: root/drivers/acpi/processor_pdc.c
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Diffstat (limited to 'drivers/acpi/processor_pdc.c')
-rw-r--r--drivers/acpi/processor_pdc.c101
1 files changed, 79 insertions, 22 deletions
diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
index b416c32dda0..30e4dc0cdf3 100644
--- a/drivers/acpi/processor_pdc.c
+++ b/drivers/acpi/processor_pdc.c
@@ -1,3 +1,12 @@
+/*
+ * Copyright (C) 2005 Intel Corporation
+ * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
+ *
+ * Alex Chiang <achiang@hp.com>
+ * - Unified x86/ia64 implementations
+ * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ * - Added _PDC for platforms with Intel CPUs
+ */
#include <linux/dmi.h>
#include <acpi/acpi_drivers.h>
@@ -33,17 +42,66 @@ static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {
{},
};
+static void acpi_set_pdc_bits(u32 *buf)
+{
+ buf[0] = ACPI_PDC_REVISION_ID;
+ buf[1] = 1;
+
+ /* Enable coordination with firmware's _TSD info */
+ buf[2] = ACPI_PDC_SMP_T_SWCOORD;
+
+ /* Twiddle arch-specific bits needed for _PDC */
+ arch_acpi_set_pdc_bits(buf);
+}
+
+static struct acpi_object_list *acpi_processor_alloc_pdc(void)
+{
+ struct acpi_object_list *obj_list;
+ union acpi_object *obj;
+ u32 *buf;
+
+ /* allocate and initialize pdc. It will be used later. */
+ obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
+ if (!obj_list) {
+ printk(KERN_ERR "Memory allocation error\n");
+ return NULL;
+ }
+
+ obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
+ if (!obj) {
+ printk(KERN_ERR "Memory allocation error\n");
+ kfree(obj_list);
+ return NULL;
+ }
+
+ buf = kmalloc(12, GFP_KERNEL);
+ if (!buf) {
+ printk(KERN_ERR "Memory allocation error\n");
+ kfree(obj);
+ kfree(obj_list);
+ return NULL;
+ }
+
+ acpi_set_pdc_bits(buf);
+
+ obj->type = ACPI_TYPE_BUFFER;
+ obj->buffer.length = 12;
+ obj->buffer.pointer = (u8 *) buf;
+ obj_list->count = 1;
+ obj_list->pointer = obj;
+
+ return obj_list;
+}
+
/*
* _PDC is required for a BIOS-OS handshake for most of the newer
* ACPI processor features.
*/
-static int acpi_processor_eval_pdc(struct acpi_processor *pr)
+static int
+acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
- struct acpi_object_list *pdc_in = pr->pdc;
acpi_status status = AE_OK;
- if (!pdc_in)
- return status;
if (idle_nomwait) {
/*
* If mwait is disabled for CPU C-states, the C2C3_FFH access
@@ -58,7 +116,7 @@ static int acpi_processor_eval_pdc(struct acpi_processor *pr)
buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
}
- status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
+ status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
if (ACPI_FAILURE(status))
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
@@ -67,30 +125,29 @@ static int acpi_processor_eval_pdc(struct acpi_processor *pr)
return status;
}
-void acpi_processor_set_pdc(struct acpi_processor *pr)
+void acpi_processor_set_pdc(acpi_handle handle)
{
- arch_acpi_processor_init_pdc(pr);
- acpi_processor_eval_pdc(pr);
- arch_acpi_processor_cleanup_pdc(pr);
+ struct acpi_object_list *obj_list;
+
+ if (arch_has_acpi_pdc() == false)
+ return;
+
+ obj_list = acpi_processor_alloc_pdc();
+ if (!obj_list)
+ return;
+
+ acpi_processor_eval_pdc(handle, obj_list);
+
+ kfree(obj_list->pointer->buffer.pointer);
+ kfree(obj_list->pointer);
+ kfree(obj_list);
}
EXPORT_SYMBOL_GPL(acpi_processor_set_pdc);
static acpi_status
early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
{
- struct acpi_processor pr;
-
- pr.handle = handle;
-
- /* x86 implementation looks at pr.id to determine some
- * CPU capabilites. We can just hard code to 0 since we're
- * assuming the CPUs in the system are homogenous and all
- * have the same capabilities.
- */
- pr.id = 0;
-
- acpi_processor_set_pdc(&pr);
-
+ acpi_processor_set_pdc(handle);
return AE_OK;
}