Merge branch 'pdc' into release

2 files changed, 80 insertions, 23 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index a19a4ff962ea..9863c98c81ba 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -763,7 +763,7 @@ static int __cpuinit acpi_processor_add(struct acpi_device *device)
         }
 
         /* _PDC call should be done before doing anything else (if reqd.). */
-        acpi_processor_set_pdc(pr);
+        acpi_processor_set_pdc(pr->handle);
 
 #ifdef CONFIG_CPU_FREQ
         acpi_processor_ppc_has_changed(pr, 0);
diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
index b416c32dda04..30e4dc0cdf30 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;
 }