ACPI/PCI: handle multiple _OSC

There is an IA64 system here which have two pci root bridges with _OSC.
One _OSC disables SHPC control bit but the other not. Below patch makes
_OSC data per-device instead of one global, otherwise linux takes both
root bridges don't support SHPC.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index ddfd756fc8eded6ee98f6a2291fd6360ddebf123..468d13e1458e3f586bf9dac4f7b9ddc206dff521 100644 (file)
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -19,8 +19,31 @@
 #include <linux/pci-acpi.h>
 #include "pci.h"
 
-static u32 ctrlset_buf[3] = {0, 0, 0};
-static u32 global_ctrlsets = 0;
+struct acpi_osc_data {
+       acpi_handle handle;
+       u32 ctrlset_buf[3];
+       u32 global_ctrlsets;
+       struct list_head sibiling;
+};
+static LIST_HEAD(acpi_osc_data_list);
+
+static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
+{
+       struct acpi_osc_data *data;
+
+       list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
+               if (data->handle == handle)
+                       return data;
+       }
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return NULL;
+       INIT_LIST_HEAD(&data->sibiling);
+       data->handle = handle;
+       list_add_tail(&data->sibiling, &acpi_osc_data_list);
+       return data;
+}
+
 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
 
 static acpi_status  
@@ -37,8 +60,21 @@ acpi_query_osc (
        union acpi_object       *out_obj;
        u32                     osc_dw0;
        acpi_status *ret_status = (acpi_status *)retval;
+       struct acpi_osc_data *osc_data = acpi_get_osc_data(handle);
+       u32 flags = (unsigned long)context, temp;
+
+       if (!osc_data) {
+               printk(KERN_ERR "acpi osc data array is full\n");
+               return AE_ERROR;
+       }
+
+       osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
+
+       /* do _OSC query for all possible controls */
+       temp = osc_data->ctrlset_buf[OSC_CONTROL_TYPE];
+       osc_data->ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
+       osc_data->ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
 
-       
        /* Setting up input parameters */
        input.count = 4;
        input.pointer = in_params;
@@ -51,13 +87,11 @@ acpi_query_osc (
        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 *)context;
+       in_params[3].buffer.pointer     = (u8 *)osc_data->ctrlset_buf;
 
        status = acpi_evaluate_object(handle, "_OSC", &input, &output);
-       if (ACPI_FAILURE (status)) {
-               *ret_status = status;
-               return status;
-       }
+       if (ACPI_FAILURE(status))
+               goto out_nofree;
        out_obj = output.pointer;
 
        if (out_obj->type != ACPI_TYPE_BUFFER) {
@@ -76,7 +110,8 @@ acpi_query_osc (
                        printk(KERN_DEBUG "_OSC invalid revision\n"); 
                if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
                        /* Update Global Control Set */
-                       global_ctrlsets = *((u32 *)(out_obj->buffer.pointer+8));
+                       osc_data->global_ctrlsets =
+                               *((u32 *)(out_obj->buffer.pointer + 8));
                        status = AE_OK;
                        goto query_osc_out;
                }
@@ -85,12 +120,21 @@ acpi_query_osc (
        }
 
        /* Update Global Control Set */
-       global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8));
+       osc_data->global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8));
        status = AE_OK;
 
 query_osc_out:
        kfree(output.pointer);
+out_nofree:
        *ret_status = status;
+
+       osc_data->ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
+       osc_data->ctrlset_buf[OSC_CONTROL_TYPE] = temp;
+       if (ACPI_FAILURE(status)) {
+               /* no osc support at all */
+               osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] = 0;
+       }
+
        return status;
 }
 
@@ -165,28 +209,15 @@ run_osc_out:
  **/
 acpi_status __pci_osc_support_set(u32 flags, const char *hid)
 {
-       u32 temp;
        acpi_status retval = AE_NOT_FOUND;
 
        if (!(flags & OSC_SUPPORT_MASKS)) {
                return AE_TYPE;
        }
-       ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
-
-       /* do _OSC query for all possible controls */
-       temp = ctrlset_buf[OSC_CONTROL_TYPE];
-       ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
-       ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
        acpi_get_devices(hid,
                        acpi_query_osc,
-                       ctrlset_buf,
+                       (void *)(unsigned long)flags,
                        (void **) &retval );
-       ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
-       ctrlset_buf[OSC_CONTROL_TYPE] = temp;
-       if (ACPI_FAILURE(retval)) {
-               /* no osc support at all */
-               ctrlset_buf[OSC_SUPPORT_TYPE] = 0;
-       }
        return AE_OK;
 }
 
@@ -201,19 +232,25 @@ acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
 {
        acpi_status     status;
        u32             ctrlset;
+       struct acpi_osc_data *osc_data = acpi_get_osc_data(handle);
+
+       if (!osc_data) {
+               printk(KERN_ERR "acpi osc data array is full\n");
+               return AE_ERROR;
+       }
 
        ctrlset = (flags & OSC_CONTROL_MASKS);
        if (!ctrlset) {
                return AE_TYPE;
        }
-       if (ctrlset_buf[OSC_SUPPORT_TYPE] && 
-               ((global_ctrlsets & ctrlset) != ctrlset)) {
+       if (osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] &&
+               ((osc_data->global_ctrlsets & ctrlset) != ctrlset)) {
                return AE_SUPPORT;
        }
-       ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
-       status = acpi_run_osc(handle, ctrlset_buf);
+       osc_data->ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
+       status = acpi_run_osc(handle, osc_data->ctrlset_buf);
        if (ACPI_FAILURE (status)) {
-               ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
+               osc_data->ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
        }
        
        return status;