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pci-acpi: use local buffer for _OSC
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Current pci-acpi implementation uses array in osc_data directly to
evaluate _OSC. It needs to save the old data and restore it if _OSC
evaluation fails. To make it more robust, we should use local array to
evaluate _OSC.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Acked-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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@kkaneshige @jbarnes993
kkaneshige authored and jbarnes993 committed Jun 10, 2008
1 parent 8a7a4fa commit 5e0b994
Showing 1 changed file with 39 additions and 34 deletions.
73 changes: 39 additions & 34 deletions drivers/pci/pci-acpi.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -21,12 +21,18 @@

struct acpi_osc_data {
acpi_handle handle;
u32 ctrlset_buf[3];
u32 global_ctrlsets;
u32 support_set;
u32 control_set;
u32 query_result;
struct list_head sibiling;
};
static LIST_HEAD(acpi_osc_data_list);

struct acpi_osc_args {
u32 capbuf[3];
u32 query_result;
};

static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
{
struct acpi_osc_data *data;
Expand All @@ -47,14 +53,14 @@ static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
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_run_osc(acpi_handle handle,
struct acpi_osc_data *osc_data)
struct acpi_osc_args *osc_args)
{
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 osc_dw0, flags = osc_data->ctrlset_buf[OSC_QUERY_TYPE];
u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE];

/* Setting up input parameters */
input.count = 4;
Expand All @@ -68,7 +74,7 @@ static acpi_status acpi_run_osc(acpi_handle handle,
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 *)osc_data->ctrlset_buf;
in_params[3].buffer.pointer = (u8 *)osc_args->capbuf;

status = acpi_evaluate_object(handle, "_OSC", &input, &output);
if (ACPI_FAILURE(status))
Expand Down Expand Up @@ -99,11 +105,9 @@ static acpi_status acpi_run_osc(acpi_handle handle,
goto out_kfree;
}
out_success:
if (flags & OSC_QUERY_ENABLE) {
/* Update Global Control Set */
osc_data->global_ctrlsets =
if (flags & OSC_QUERY_ENABLE)
osc_args->query_result =
*((u32 *)(out_obj->buffer.pointer + 8));
}
status = AE_OK;

out_kfree:
Expand All @@ -117,8 +121,9 @@ static acpi_status acpi_query_osc(acpi_handle handle,
acpi_status status;
acpi_status *ret_status = (acpi_status *)retval;
struct acpi_osc_data *osc_data;
u32 flags = (unsigned long)context, temp;
u32 flags = (unsigned long)context, support_set;
acpi_handle tmp;
struct acpi_osc_args osc_args;

status = acpi_get_handle(handle, "_OSC", &tmp);
if (ACPI_FAILURE(status))
Expand All @@ -130,21 +135,18 @@ static acpi_status acpi_query_osc(acpi_handle handle,
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;
support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;

status = acpi_run_osc(handle, osc_data);
status = acpi_run_osc(handle, &osc_args);
*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;
if (ACPI_SUCCESS(status)) {
osc_data->support_set = support_set;
osc_data->query_result = osc_args.query_result;
}

return status;
Expand Down Expand Up @@ -181,10 +183,11 @@ acpi_status __pci_osc_support_set(u32 flags, const char *hid)
**/
acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
{
acpi_status status;
u32 ctrlset;
acpi_status status;
u32 ctrlset, control_set;
acpi_handle tmp;
struct acpi_osc_data *osc_data;
struct acpi_osc_args osc_args;

status = acpi_get_handle(handle, "_OSC", &tmp);
if (ACPI_FAILURE(status))
Expand All @@ -197,19 +200,21 @@ acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
}

ctrlset = (flags & OSC_CONTROL_MASKS);
if (!ctrlset) {
if (!ctrlset)
return AE_TYPE;
}
if (osc_data->ctrlset_buf[OSC_SUPPORT_TYPE] &&
((osc_data->global_ctrlsets & ctrlset) != ctrlset)) {

if (osc_data->support_set &&
((osc_data->query_result & ctrlset) != ctrlset))
return AE_SUPPORT;
}
osc_data->ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
status = acpi_run_osc(handle, osc_data);
if (ACPI_FAILURE (status)) {
osc_data->ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
}


control_set = osc_data->control_set | ctrlset;
osc_args.capbuf[OSC_QUERY_TYPE] = 0;
osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
status = acpi_run_osc(handle, &osc_args);
if (ACPI_SUCCESS(status))
osc_data->control_set = control_set;

return status;
}
EXPORT_SYMBOL(pci_osc_control_set);
Expand Down

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